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  • 1.
    Chen, XÍ
    et al.
    Huazhong University of Science and Technology, China.
    Lin, Rui
    Huazhong University of Science and Technology, China.
    Cui, Jingxian
    Huazhong University of Science and Technology, China.
    Gan, Li
    Huazhong University of Science and Technology, China.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Jiang, Tao
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Chena, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    TDHQ Enabling Fine-granularity Adaptive Loading for SSB-DMT Systems2018Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 30, nr 19, s. 1687-1690Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this letter, we introduce time domain hybrid quadrature amplitude modulation (TDHQ) for the single sideband (SSB) discrete multi-tone (DMT) systems. Experimental results reveal that with a single precoding set and the proposed adaptive loading algorithm, the TDHQ scheme can achieve finer granularity and therefore smoother continuous growth of data rate than that with the conventional quadrature amplitude modulation (QAM). Besides, thanks to the frame construction and the tailored mapping rule, the scheme with TDHQ has an obviously better peak to average power ratio (PAPR).

  • 2.
    Estarán, Jose
    et al.
    Nokia Bell Labs, France.
    Mardoyan, Haik
    Nokia Bell Labs, France.
    Jorge, Filipe
    Nokia Bell Labs, France.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Konczykowska, Agnieszka
    Nokia Bell Labs, France.
    Riet, Muriel
    Nokia Bell Labs, France.
    Duval, Bernadette
    Nokia Bell Labs, France.
    Nodjiadjim, Virginie
    Nokia Bell Labs, France.
    Dupuy, Jean Yves
    Nokia Bell Labs, France.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Bigo, Sebastien
    Nokia Bell Labs, France.
    140/180/204-Gbaud OOK Transceiver for Inter- and Intra-Data Center Connectivity2019Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, nr 1, s. 178-187, artikkel-id 8500133Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report on an on-off keying intensity-modulation and direct-detection C-band optical transceiver capable of addressing all datacenter interconnect environments at well-beyond 100Gbaud. For this, the transmitter makes use of two key InP technologies: a 2:1 double heterojunction bipolar transistor selector multiplexer and a monolithically integrated distributed-feedback laser traveling-wave electro-absorption modulator, both exceeding 100-GHz of 3-dB analog bandwidth. A pre-amplified 110-GHz PIN photodiode prior to a 100-GHz analog-to-digital converter complete the ultra-high bandwidth transceiver module; the device under study. In the experimental work, which discriminates between intra- and inter-data center scenarios (dispersion unmanaged 120, 560, 960m; and dispersion-managed 10, and 80km of standard singlemode fiber), we evaluate the bit-error rate evolution against the received optical power at 140, 180, and 204Gbaud on-off keying for different equalization configurations (adaptive linear filter with and without the help of short-memory sequence estimation) and forward error correction schemes (hard-decision codes with 7% and 20% overhead); drawing conclusions from the observed system-level limitations of the respective environments at this ultra-high baudrate, as well as from the operation margins and sensitivity metrics. From the demonstration, we highlight three results: successful operation with >6-dB sensitivity margin below the 7% error-correction at 140Gbaud over the entire 100m-80km range with only linear feed-forward equalization. Then the transmission of a 180Gbaud on-off-keying carrier over 80km considering 20% error-correction overhead. And finally, 10-km communication at 204Gbaud on-off keying with up to 6dB sensitivity margin, and regular 7%-overhead error-correction.

  • 3.
    Hong, Xuexhi
    et al.
    KTH Royal Institute of Technology, Sweden.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Guo, Changjian
    South China Normal University, China.
    Nordwall, Fredrik
    Tektronix AB, Sweden.
    Engenhardt, Klaus M.
    Tektronix GmbH, Germany.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Xiao, Shilin
    Shanghai Jiao Tong University, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    200-Gbps DMT Transmission over 1.6-km SSMF with A Single EML/DAC/PD for Optical Interconnects at C-Band2017Inngår i: European Conference on Optical Communication, ECOC, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We report on the first experimental demonstration of 200-Gbps (net rate 166.7-Gbps) 1.55-μm DMT IMDD transmission over 1.6 km fiber using a single monolithically-integrated-EML, DAC and photodiode, achieving an effective electrical spectrum efficiency of 4.93 bit/s/Hz. © 2017 IEEE.

  • 4.
    Hu, H.
    et al.
    DTU Technical University of Denmark, Denmark; University College London, UK.
    Jia, S.
    DTU Technical University of Denmark, Denmark.
    Lo, M. -C
    Universidad Carlos III de Madrid, Spain.
    Zhang, L.
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kong, D.
    DTU Technical University of Denmark, Denmark.
    Pang, X.
    KTH Royal Institute of Technology, Sweden.
    Yu, X.
    Zhejiang University, China.
    Xiao, S.
    Shanghai Jiao Tong University, China.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Chen, J.
    KTH Royal Institute of Technology, Sweden.
    Carpintero, G.
    Universidad Carlos III de Madrid, Spain.
    Morioka, T.
    DTU Technical University of Denmark, Denmark.
    Oxenlowe, L.
    DTU Technical University of Denmark, Denmark.
    TuB4.1-chip based thz emitter for ultra-high speed THz wireless communication (Invited)2019Inngår i: IEEE Photonics Society Summer Topical Meeting Series 2019, SUM 2019, Institute of Electrical and Electronics Engineers Inc. , 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    By using a monolithically integrated dual-distributed feedback (DFB) laser chip attached to a photomixing uni-Travelling carrier photodiode (UTC-PD) with a THz antenna, single-channel THz photonic-wireless transmission system with a net rate of 131 Gbit/s over a wireless distance of 10.7 m has been achieved. 

  • 5.
    Jia, S.
    et al.
    DTU Technical University of Denmark, Denmark.
    Lo, MC
    Universidad Carlos III de Madrid, Spain.
    Zhang, L.
    KTH Royal Institute of Technology, Sweden; Shanghai Jiao Tong University, China.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kong, D.
    DTU Technical University of Denmark, Denmark.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Yu, X.
    Zhejiang University, China.
    Xiao, S.
    Shanghai Jiao Tong University, China.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Chen, J.
    KTH Royal Institute of Technology, Sweden.
    Carpintero, G.
    DTU Technical University of Denmark, Denmark.
    Morioka, T.
    Universidad Carlos III de Madrid, Spain.
    Hu, H.
    DTU Technical University of Denmark, Denmark.
    Oxenlowe, L. K.
    DTU Technical University of Denmark, Denmark.
    Integrated Dual-DFB Laser for 408 GHz Carrier Generation Enabling 131 Gbit/s Wireless Transmission over 10.7 Meters2019Inngår i: 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019, artikkel-id 8697005Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A monolithically integrated dual-DFB laser generates a 408 GHz carrier used for demonstrating a record-high single-channel bit rate of 131 Gbit/s transmitted over 10.7 m. 16-QAM-OFDM modulation and specific nonlinear equalization techniques are employed

  • 6.
    Kerrebrouck, Joris Van
    et al.
    Ghent University, Belgium.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    Huazhong University of Science and Technology, China.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    Shanghai Jiao Tong University, China.
    Li, Haolin
    Ghent University, Belgium.
    Spiga, Silvia
    Technical University of Munich, Germany.
    Amann, MC
    Technical University of Munich, Germany.
    Gan, Ling
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Soignian
    Huazhong University of Science and Technology, China.
    Schatz, Rickhard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical Fibre and Cable, China.
    Torfs, Guy
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Yin, Xin
    Ghent University, Belgium.
    High-speed PAM4-based Optical SDM Interconnects with Directly Modulated Long-wavelength VCSEL2018Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, s. 356-362Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-μm single-mode vertical cavity surface emitting laser (SM-VCSEL) over multicore fiber with 7 cores over different distances. We have successfully generated up to 70 Gbaud 4-level pulse amplitude modulation (PAM-4) signals with a VCSEL in optical back-to-back, and transmitted 50 Gbaud PAM-4 signals over both 1-km dispersion-uncompensated and 10-km dispersion-compensated in each core, enabling a total data throughput of 700 Gbps over the 7-core fiber. Moreover, 56 Gbaud PAM-4 over 1-km has also been shown, whereby unfortunately not all cores provide the required 3.8 × 10<formula><tex>$^-3$</tex></formula>bit error rate (BER) for the 7% overhead-hard decision forward error correction (7% OH HDFEC). The limited bandwidth of the VCSEL and the adverse chromatic dispersion of the fiber are suppressed with pre-equalization based on accurate end-to-end channel characterizations. With a digital post-equalization, BER performance below the 7% OH-HDFEC limit is achieved over all cores. The demonstrated results show a great potential to realize high-capacity and compact short-reach optical interconnects for data centers.

  • 7.
    Kerrebrouck, Joris Van
    et al.
    Ghent University, Belgium.
    Zhang, Liu
    KTH Royal Institute of Technology, Sweden; Shanghai Jiao Tong University, China.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden; Huazhong University of Science and Technology, China.
    Pang, Xioadan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Spiga, Silvia
    Walter Schottky Institut, Germany.
    Amann, Markus Christian
    Walter Schottky Institut, Germany.
    van Steenberge, Geert
    Ghent University, Belgium.
    Gan, Lei
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Di
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical Fiber and Cable, China.
    Xiao, Shiyi
    Shanghai Jiao Tong University, China.
    Torfs, Guy
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Yin, Xin
    Ghent University, Belgium.
    726.7-Gb/s 1.5-μm single-mode VCSEL discrete multi-tone transmission over 2.5-km multicore fiber2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A 107Gb/s net-rate DMT optical signal was generated using a single-mode long-wavelength VCSEL with a modulation bandwidth of 23 GHz. We experimentally demonstrated a total net-rate up to 726.7Gb/s at 1.5&amp;#x03BC;m over 2.5km 7-core dispersion-uncompensated MCF.

  • 8.
    Lavrinovica, Ingrida
    et al.
    Riga Technical University, Latvia.
    Supe, Andis
    Riga Technical University, Latvia.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Porins, Jurgis
    Riga Technical University, Latvia.
    Exploration of Optical Amplifiers Based on Erbium (Er3+) and Ytterbium (Yb3+) Doped Fiber Segments and Its Emerging Applications2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper proposes the improvement of EDFA amplifier properties by adding additional segments of Yb<sup>3+</sup> doped fiber. Experimental demonstration of a combined erbium-ytterbium doped fiber amplifier (EYDFA) performance using 5 m long erbium-doped fiber (EDF) and 5 m long ytterbium-doped fiber (YDF) is presented.

  • 9.
    Lin, R.
    et al.
    KTH Royal Institute of Technology, Sweden; Huazhong University of Science and Technology, China.
    Gan, L.
    Huazhong University of Science and Technology, China.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Shen, L.
    Huazhong University of Science and Technology, China.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Tang, M.
    Huazhong University of Science and Technology, China.
    Fu, S.
    Huazhong University of Science and Technology, China.
    Tong, W.
    Yangtze Optical Fiber and Cable Joint Stock Ltd Co, China.
    Liu, D.
    Huazhong University of Science and Technology, China.
    Da Silva, T. F.
    National Institute of Metrology, Brazil.
    Xavier, G. B.
    Linköping University, Sweden.
    Chen, J.
    KTH Royal Institute of Technology, Sweden.
    Spontaneous Raman Scattering Effects in Multicore Fibers: Impact on Coexistence of Quantum and Classical Channels2019Inngår i: 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019, artikkel-id 8696422Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We measure spontaneous Raman scattering (SRS) effects in C-band and observe trench-assisted MCF is robust to SRS noise, making it possible to run quantum channels in the neighboring and/or the same core as data channels.

  • 10.
    Lin, R.
    et al.
    Chalmers Tekniska Högskola, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Tang, M.
    Huazhong University of Science and Technology, China.
    Fu, S.
    Huazhong University of Science and Technology, China.
    Popov, Sergei
    KTH Royal institute of Technology, Sweden.
    Da Silva, T. F.
    National Institute of Metrology, Brazil.
    Xavier, G. B.
    Linköpings Universitet, Sweden.
    Chen, J.
    Chalmers Tekniska Högskola, Sweden.
    Embedding quantum key distribution into optical telecom communication systems2019Inngår i: International Conference on Transparent Optical Networks, IEEE Computer Society , 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Quantum key distribution (QKD) together with one-time pad cryptography provides unconditional security for the sensitive information. However, the lack of telecom compatibility hinders massive deployment of QKD. In this talk we will discuss the approaches of embedding QKD in optical communication systems and the recent progress.

  • 11.
    Lin, Rui
    et al.
    KTH Royal Institute of Technology, Sweden.
    Kerrebrouck, Joris Van
    Ghent University, Belgium.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Verplaetse, Michiel
    Ghent University, Belgium.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical Fiber and Cable, China.
    Keulenaer, Timothy De
    Ghent University, Belgium.
    Torfs, Guy
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Yin, Xin
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Spatial division multiplexing for optical data center networks2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Emerging mobile and cloud applications drive ever-increasing capacity demands, particularly for short-reach optical communications, where low-cost and low-power solutions are highly required. Spatial division multiplexing (SDM) techniques provide a promising way to scale up the lane count per fiber, while reducing the number of fiber connections and patch cords, and hence simplifying cabling complexity. This talk will address challenges on both system and network levels, and report our recent development on SDM techniques for optical data center networks.

  • 12.
    Lin, Rui
    et al.
    KTH Royal Institute of Technology, Sweden.
    Lu, Yang
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Cheng, Yuxin
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    First Experimental Demonstration of Physical-Layer Network Coding in PAM4 System for Passive Optical Interconnects2018Inngår i: European Conference on Optical Communication, ECOC, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose to implement physical-layer network coding (PLNC) in coupler-based passive optical interconnects. The PLNC over PAM4 system is for the first time experimentally validated, where simultaneous mutual communications can be kept within the same wavelength channel, doubling spectrum efficiency.

  • 13.
    Lin, Rui
    et al.
    Huazhong University of Science and Technology, China.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Kerrebrouck, Joris Van
    Ghent University, Belgium.
    Verplaetse, Michiel
    Ghent University, Belgium.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical Fiber and Cable, China.
    Keulenaer, Timothy De
    Ghent University, Belgium.
    Torfs, Guy
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Yin, Xin
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Real-time 100 Gbps/lambda/core NRZ and EDB IM/DD Transmission over 10 km Multicore Fiber2018Inngår i: 2018 Optical Fiber Communications Conference and Exposition (OFC), 2018, s. 1-3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A BiCMOS chip-based real-time IM/DD spatial division multiplexing system is experimentally demonstrated for short-reach communications. 100 Gbps/&amp;#x03BB;/core NRZ and EDB transmission is achieved below 7%-overhead HD-FEC limit after 10km 7-core fiber with optical dispersion compensation.

  • 14.
    Lin, Rui
    et al.
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Gan, L
    Huazhong University of Science and Technology, China.
    Shen, L
    Huazhong University of Science and Technology, China.
    Tang, M.
    Huazhong University of Science and Technology, China.
    Fu, S.
    Huazhong University of Science and Technology, China.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Yang, C.
    YOFC Yangtze Optical Fiber and Cable, China.
    Tong, W.
    YOFC Yangtze Optical Fiber and Cable, China.
    Liu, D.
    Huazhong University of Science and Technology, China.
    Silva, T. F. da
    National Institute of Metrology, Brazil.
    Xavier, G. B.
    Linköping University, Sweden.
    Chen, J.
    KTH Royal Institute of Technology, Sweden.
    Telecom Compatibility Validation of Quantum Key Distribution Co-Existing with 112 Gbps/$\boldsymbol{\lambda}$/core Data Transmission in Non-Trench and Trench-Assistant Multicore Fibers2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We experimentally characterize photon leakage from 112Gb/s data channels in both non-trench and trench-assistant 7-core fibers, demonstrating telecom compatibility for QKD co-existing with high-speed data transmission when a proper core/wavelength allocation is carried out.

  • 15.
    Lin, Rui
    et al.
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Shen, Li
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Yang, Chen
    YOFC Yangtze Optical fiber and Cable, China.
    Tong, Weijun
    YOFC Yangtze Optical fiber and Cable, China.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Silva, Thiago
    National Institute of Metrology, Brazil.
    Xavier, Guilherme
    Linköping University, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Integrating Quantum Key Distribution with the Spatial Division Multiplexing Enabled High Capacity Optical Networks2018Inngår i: 2018 Asia Communications and Photonics Conference (ACP), 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this talk, we discuss integrating the quantum key distribution (QKD) with the spatial division multiplexing (SDM) enabled optical communication network for the cyber security.

  • 16.
    Lin, Rui
    et al.
    Huazhong University of Science and Technology, China; KTH Royal Institute of Technology, Sweden.
    Van Kerrebrouck, Joris
    Ghent University, Belgium.
    Pang, Xiaodan
    Ghent University, Belgium.
    Verplaetse, Michael
    KTH Royal Institute of Technology, Sweden; Ghent University, Belgium.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Sognian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical Fiber and Cable, China.
    De Keulenaer, Timothy
    Ghent University, Belgium.
    Torfs, Gui
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Yin, Xin
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Real-time 100 Gbps/lambda/core NRZ and EDB IM/DD transmission over multicore fiber for intra-datacenter communication networks2018Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, nr 8, s. 10519-10526Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A BiCMOS chip-based real-time intensity modulation/direct detection spatial division multiplexing system is experimentally demonstrated for both optical interconnects. 100 Gbps/lambda/core electrical duobinary (EDB) transmission over 1 km 7-core multicore fiber (MCF) is carried out, achieving KP4 forward error correction (FEC) limit (BER < 2E-4). Using optical dispersion compensation, 7 x 100 Gbps/lambda/core transmission of both non-retunito-zero (NRZ) and EDB signals over 10 km MCF transmission is achieved with BER lower than 7% overhead hard-decision FEC limit (BER < 3.8E-3). The integrated low complexity transceiver IC and analog signal processing approach make such a system highly attractive for the high-speed intra-datacenter interconnects. (C) 2018 Optical Society of America under the terms oldie OSA open Access Publishing Agreement.

  • 17.
    Lu, Yang
    et al.
    KTH Royal Institute of Technology, Sweden ; Hangzhou Dianzi University, China.
    Agrell, Erik
    Chalmers University of Technology, Sweden.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Hong, Xuexhi
    KTH Royal Institute of Technology, Sweden.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Cheng, Yuxin
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Matrix Receiving Scheme Supporting Arbitrary Multiple-Wavelength Reception for Optical Interconnects2017Inngår i: European Conference on Optical Communication, ECOC, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An arbitrary multiple-wavelength reception scheme using only a few fixed-wavelength filters is proposed for optical interconnects. Filter matrices design based on error-control coding theory is devised. The feasibility of the proposed scheme is demonstrated in a four-wavelength reception experiment.

  • 18.
    Lu, Yang
    et al.
    Hangzhou Dianzi University, China.
    Agrell, Erik
    Chalmers University of Technology, Sweden.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Hong, Xuezhi
    South China Normal University, China .
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Cheng, Yuxin
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden ; South China Normal University, China .
    Multi-channel collision-free reception for optical interconnects2018Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, nr 10, s. 13214-13222Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A multi-channel reception scheme that allows each node to receive an arbitrary set of wavelengths simultaneously (i.e., collision-free) is proposed for optical interconnects. The proposed scheme only needs to use a few receivers and fixed-wavelength filters that are designed based on error-control coding theory. Experiments with up to four channel collision-free reception units are carried out to demonstrate the feasibility of the proposed scheme.

  • 19.
    Mardoyan, Haik
    et al.
    Nokia Bell Labs, France.
    Jorge, Filipe
    III-V Lab, France.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Estaran, Jose Manuel
    Nokia Bell Labs, France.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Konczykowska, Agnieszka
    III-V Lab, France.
    Riet, Muriel
    III-V Lab, France.
    Duval, Bernadette
    III-V Lab, France.
    Nodjiadjim, Virginie
    III-V Lab, France.
    Dupuy, Jean-Yves
    III-V Lab, France.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Bigo, Sebastien
    Nokia Bell Labs, France.
    204-GBaud On-Off Keying Transmitter for Inter-Data Center Communications2018Inngår i: Optical Fiber Communication Conference Postdeadline Papers OSA Technical Digest (online) (Optical Society of America, 2018), paper Th4A.4, 2018, artikkel-id Th4A.4Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate an on-off keyed transmitter with direct detection, at record symbol rates of 204Gbaud and 140Gbaud, over 10km and 80km, respectively, powered by a high-speed InP-based 2:1 selector and travelling-wave electro-absorption laser-modulator.

  • 20.
    Marinins, A.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Cylindrical polymer optical waveguides with polarization independent performance2017Inngår i: 2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings, 2017, s. 1-2Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Heating of poly(methyl methacrylate) ridge optical waveguides slightly above glass transition temperature minimizes surface roughness and provides cylindrical shape. We experimentally demonstrate propagation loss decrease and polarization insensitivity as a result of waveguide thermal treatment.

  • 21.
    Marinins, A.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Veinot, J.
    University of Alberta, Canada.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Sychugov, I.
    KTH Royal Institute of Technology, Sweden.
    Linnros, J.
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    All-optical intensity modulation in polymer waveguides doped with si quantum dots2018Inngår i: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper JW2A.31, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate all-optical intensity modulation in integrated PMMA optical waveguides doped with silicon quantum dots. The 1550 nm probe signal is absorbed by free carriers excited in silicon quantum dots with 405 nm pump light.

  • 22.
    Marinins, Aleksandrs
    et al.
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Cylindrical polymer optical waveguides with polarization independent performance2017Inngår i: Optics InfoBase Conference Papers, 2017, artikkel-id SF1J.6Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Heating of poly(methyl methacrylate) ridge optical waveguides slightly above glass transition temperature minimizes surface roughness and provides cylindrical shape. We experimentally demonstrate propagation loss decrease and polarization insensitivity as a result of waveguide thermal treatment.

  • 23.
    Marinins, Aleksandrs
    et al.
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kakkar, Aditya
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Thermal reflow engineered cylindrical polymer waveguides for optical interconnects2018Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 30, nr 5, s. 447-450Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Integrated polymer photonics brings low cost and high fabrication flexibility to optoelectronic industry. However, this platform needs to overcome several issues to be effective enough for practical applications. In this work, we experimentally demonstrate a decrease of propagation losses and polarization sensitivity of polymer waveguide-based devices as a result of thermal treatment. Heating of poly(methyl methacrylate) strip optical waveguides above the glass transition temperature initiates a waveguide surface reflow due to a decrease of the polymer viscosity and surface tension energy. This results in a decrease of surface roughness and shape change from rectangular to cylindrical. Thus, scattering losses and polarization sensitivity are minimized. IEEE

  • 24.
    Navarro, Jaime Rodrigo
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Kakkar, Aditye
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Blind phase search with angular quantization noise mitigation for efficient carrier phase recovery2017Inngår i: Photonics, ISSN 2304-6732, Vol. 4, nr 2, artikkel-id 37Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The inherent discrete phase search nature of the conventional blind phase search (C-BPS) algorithm is found to introduce angular quantization noise in its phase noise estimator. The angular quantization noise found in the C-BPS is shown to limit its achievable performance and its potential low complexity implementation. A novel filtered BPS algorithm (F-BPS) is proposed and demonstrated to mitigate this quantization noise by performing a low pass filter operation on the C-BPS phase noise estimator. The improved performance of the proposed F-BPS algorithm makes it possible to significantly reduce the number of necessary test phases to achieve the C-BPS performance, thereby allowing for a drastic reduction of its practical implementation complexity. The proposed F-BPS scheme performance is evaluated on a 28-Gbaud 16QAM and 64QAM both in simulations and experimentally. Results confirm a substantial improvement of the performance along with a significant reduction of its potential implementation complexity compared to that of the C-BPS.

  • 25.
    Osorio, Camilo
    et al.
    University of Campinas, Brazil.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Barreto, Andre
    University of Campinas, Brazil.
    Monti, Paolo
    University of Campinas, Brazil.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Mello, Darli
    University of Campinas, Brazil.
    Dual-Mode Distance-Adaptive Transceiver Architecture for 5G Optical Fiber Fronthaul2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose a transceiver architecture for 5G fronthaul that adapts the modulation format according to the channel quality. The proposed solution operates in dual-mode using digital signal processing (DSP)-assisted analog radio-over-fiber (A-RoF) and digital radio-over-fiber (D-RoF) with multiple modulation orders. The system performance is assessed through Monte-Carlo simulations of the optical fiber link conveying wireless waveforms that utilize the filter bank multicarrier (FBMC) and orthogonal frequency-division multiplexing (OFDM) formats. The simulation results highlight the benefits of having both digital and DSP-assisted analog transmission capabilities to optimize the reach versus spectral efficiency trade-off in optical fronthaul.

  • 26.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden; Huazhong University of Science and Technology, China.
    Van Kerrebrouck, Jóris
    Ghent University, Belgium.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Liu, Deming
    KTH Royal Institute of Technology, Sweden.
    Tong, Weijun
    YOFC Yangtze Optical fiber and Cable, China.
    Torfs, Guy
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Yin, Xin
    Ghent University, Belgium.
    7×149 Gbit/s PAM4 transmission over 1 km multicore fiber for short-reach optical interconnects2018Inngår i: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper SM4C.4, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We transmit 80 Gbaud/λ/core PAM4 signal enabled by 1.55 μm EML over 1 km 7-core fiber. The solution achieves single-wavelength and single-fiber 1.04 Tbit/s post-FEC transmission enhancing bandwidth-density for short-reach optical interconnects.

  • 27.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Nordwall, Fredrik
    Tektronix AB, Sweden.
    Engenhardt, Klaus
    Tektronix GmbH, Germany.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    100 Gbaud 4PAM Link for High Speed Optical Interconnects2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate 100 Gbaud 4PAM transmission over 400 meters SMF with monolithically integrated 1550 nm DFB-TWEAM having 100 GHz 3-dB bandwidth with 2 dB ripple. We evaluate its capabilities to enable two lanes 400 GbE client-side links for optical interconnects. © 2017 IEEE.

  • 28.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Multilevel modulation at 100 gbaud for short reach C-band links2019Inngår i: International Conference on Transparent Optical Networks, IEEE Computer Society , 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Datacenters experience an enormous traffic growth due to the vast amount of data to be stored, transmitted and processed [1]-[4]. Technical and economic challenges arise to keep up the bandwidth scalability. Therefore, cost-efficient short reach optical interconnects for 400 GbE intra-datacenter links are critical. Attractive solutions are proposed based on eight optical lanes thanks to compatibility with 100 GbE building blocks, where two optical lanes based 100 GbE solution is already being deployed [4]. Solutions for 400 GbE based on four optical lanes or even two optical lanes using high bandwidth components may be more attractive to reduce cost, power consumption and complexity of parallelism [5], [6]. In this talk, we report on several experimental demonstrations for short reach optical interconnects in C-band. We experimentally evaluate high-speed on-off keying (OOK) and 4-level pulse amplitude modulation (PAM4) and 8-level PAM8 transmitter performance in C-band for short reach optical interconnects. We demonstrate 100 Gbaud PAM4 transmission over 400 meters long standard single mode fiber without optical amplification. We also show results of numerical simulations showing achievable transmission reach in C-band for multilevel modulation at 100 Gbaud over standard single mode fiber with simple decision feedback equalizer. This paves the way for cost-effective short reach optical interconnects with multilevel modulation at 100 Gbaud and higher. 

  • 29.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Short Reach Optical Interconnects with Single Externally Modulated Laser Operated in C-Band2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Datacenters experience massive traffic growth due to expansive growth of cloud services and online gaming [1]. This trend leads to technical and economic challenges to keep up scalability for bandwidth in short reach optical interconnects. It is of critical importance to enable a cost-efficient solution for 400 Gbps links [2]. Solution for 400 GbE based on four optical lanes [3] or even two optical lanes [4] may be more attractive to reduce power consumption and complexity of parallelism. This requires InP and silicon opto-electronic components with more than 70 GHz bandwidth [2]. In this talk, we report on several experimental demonstrations for short reach optical interconnects in C-band. We review demonstrations of up to 200 Gbit/s 4-pulse amplitude modulation (PAM) [4] and up to 200 Gbit/s discrete multitone (DMT) [5] transmission with a cost-efficient monolithically integrated externally modulated laser (EML) with large bandwidth. Related digital signal processing techniques are also discussed in terms of practical implementation and complexity, paving the way for cost-effective interconnects using high speed advanced modulation formats.

  • 30.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden; Infinera, Sweden.
    Udalcovs, Aleksejs
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Schatz, Rickard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Invited Speech Single Lane 200 Gbps Transmitter for IM/DD Links2018Inngår i: Proceedings - 2018 Advances in Wireless and Optical Communications, RTUWO 2018, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Provides an abstract of the keynote presentation and may include a brief professional biography of the presenter. The complete presentation was not made available for publication as part of the conference proceedings.

  • 31.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodang
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Olmedo, Miguel Iglesias
    KTH Royal Institute of Technology, Sweden.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Gaiarin, Simone
    KTH Royal Institute of Technology, Sweden.
    Navarro, Javier Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Engenhardt, Klaus M.
    Tektronix GmbH, Germany.
    Asyngier, Tadeusz
    Tektronix GmbH, Germany.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Li, Jie
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Nordwall, Fredrik
    Tektronix AB, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Zibar, Darko
    DTU Technical University of Denmark, Denmark.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    100 GHz Externally Modulated Laser for Optical Interconnects2017Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, nr 6, s. 1174-1179, artikkel-id 7814142Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report on a 116 Gb/s on-off keying (OOK), four pulse amplitude modulation (PAM) and 105-Gb/s 8-PAM optical transmitter using an InP-based integrated and packaged externally modulated laser for high-speed optical interconnects with up to 30 dB static extinction ratio and over 100-GHz 3-dB bandwidth with 2 dB ripple. In addition, we study the tradeoff between power penalty and equalizer length to foresee transmission distances with standard single mode fiber.

  • 32.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiodan
    RISE - Research Institutes of Sweden, ICT.
    Olmedo, Miguel Iglesias
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    “High-speed optical and wireless transmission - challenges and achievements”2016Inngår i: 2016 Advances in Wireless and Optical Communications (RTUWO), 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The cloud services together with the huge size datasets are driving demand for bandwidth in datacenters. The 400 Gbps client-side links are demanding a solution. The intensity modulation and direct-detection systems together with integrated semiconductor lasers and modulators appear as promising solution in four optical lanes at 100 Gbps net rate in order to reduce complexity, size, power consumption and cost.

  • 33.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden; Huazhong University of Science and Technology, China.
    Djupsjöbacka, Anders
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Mårtensson, Jonas
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Fröjdh, Krister
    Proximion AB, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical fiber and Cable, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    112 Gbps/λ PAM4 inter-DCI with continuous-fiber Bragg grating based dispersion compensators2018Inngår i: Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF) OSA Technical Digest (online) (Optical Society of America, 2018), paper NeTh3F.3, 2018, artikkel-id NeTh3F.3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate 56 Gbaud/λ PAM4 inter - data center interconnects over 81 km single core single mode fiber and 33.6 km 7-core single mode fiber with continuous-fiber Bragg grating based chromatic dispersion compensators covering C-band.

  • 34.
    Pang, Xiaodan
    et al.
    KTH Royal Institute of Technology, Sweden.
    Kerrebrouck, Joris Van
    Ghent University, Belgium.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Spiga, Silvia
    Technical University of Munich, Germany.
    Amann, Markus C
    Technical University of Munich, Germany.
    Steenberge, Geert Van
    Ghent University, Belgium.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical fiber and Cable, China.
    Torfs, Guy
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Yin, Xin
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    7×100 Gbps PAM-4 Transmission over 1-km and 10-km Single Mode 7-core Fiber using 1.5-μm SM-VCSEL2018Inngår i: Optical Fiber Communication Conference OSA Technical Digest (online) (Optical Society of America, 2018), paper M1I.4, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    100 Gbps/λ/core PAM-4 transmission is successfully demonstrated over 1-km and 10-km single mode 7-core fiber links, enabled by directly modulated 1.5-μm single mode VCSEL of 23 GHz modulation bandwidth with pre- and post- digital equalizations.

  • 35.
    Pang, Xiaodan
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Storck, Joakim
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Maisons, Gregory
    mirSense Centre d’intégration NanoInnov, France.
    Carras, Mathieu
    mirSense Centre d’intégration NanoInnov, France.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Lourdudoss, Sebastian
    KTH Royal Institute of Technology, Sweden.
    Gigabit free-space multi-level signal transmission with a mid-infrared quantum cascade laser operating at room temperature2017Inngår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, nr 18, s. 3646-3649Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gigabit free-space transmissions are experimentally demonstrated with a quantum cascaded laser (QCL) emitting at mid-wavelength infrared of 4.65 μm, and a commercial infrared photovoltaic detector. The QCL operating at room temperature is directly modulated using on–off keying and, for the first time, to the best of our knowledge, four- and eight-level pulse amplitude modulations (PAM-4, PAM-8). By applying pre- and post-digital equalizations, we achieve up to 3 Gbit/s line data rate in all three modulation configurations with a bit error rate performance of below the 7% overhead hard decision forward error correction limit of 3.8 × 10−3. The proposed transmission link also shows a stable operational performance in the lab environment.

  • 36.
    Pang, Xiaodan
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden; Shanghai Jiao Tong University, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Storck, Joakim
    KTH Royal Institute of Technology, Sweden.
    Maisons, Gregory
    mirSense, France.
    Carras, Mathieu
    mirSense, France.
    Xiao, Shilin
    Shanghai Jiao Tong University, China.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei Yu
    KTH Royal Institute of Technology, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Lourdudoss, Sebastian
    KTH Royal Institute of Technology, Sweden.
    4 Gbps PAM-4 and DMT Free Space Transmission using a 4.65-pm Quantum Cascaded Laser at Room Temperature2017Inngår i: European Conference on Optical Communication, ECOC, Institute of Electrical and Electronics Engineers Inc. , 2017, s. 1-3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We experimentally demonstrate 4Gbps PAM-4 and DMT transmissions using a quantum cascaded laser (QCL) emitting at mid-wavelength infrared of 4.65μm and a commercial infrared photovoltaic detector. The QCL is directly modulated and operated at room temperature with Peltier Cooling.

  • 37.
    Pang, Xiaodan
    et al.
    KTH Royal Institute of Technology, Sweden; Infinera, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden; Shanghai Jiao Tong University, China.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Xiao, Shilin
    Shanghai Jiao Tong University, China.
    Hu, Weisheng
    Shanghai Jiao Tong University, China.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Beyond 200 Gbps Per Lane Intensity Modulation Direct Detection (IM/DD) Transmissions for Optical Interconnects: Challenges and Recent Developments2019Inngår i: 2019 Optical Fiber Communications Conference and Exhibition (OFC), 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    All parts of an IM/DD system are being stretched to the limit as the single lane data rate approaches 200 Gbps and beyond. We report the recent developments on the key enablers conquering this target.

  • 38.
    Pang, Xiaodan
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Van Kerrebrouck, Joris
    Ghent University, Belgium.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden; Huazhong University of Science and Technology, China.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Spiga, Silvia
    Technical University of Munich, Germany.
    Amann, Markus C.
    Technical University of Munich, Germany.
    Van Steenberge, Geert
    Ghent University, Belgium.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical Fiber and Cable, China.
    Torfs, Guy
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Yin, Xin
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    High-speed SDM interconnects with directly-modulated 1.5-μm VCSEL enabled by low-complexity signal processing techniques2018Inngår i: Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF) OSA Technical Digest (online) (Optical Society of America, 2018), paper SpTh2G.4, 2018, artikkel-id SpTh2G.4Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We report on our recent work in supporting up to 100 Gbps/λ/core transmissions with a directly modulated 1.5-μm single mode VCSEL and multicore fiber, enabled by low-compleixty pre- and post- digital equalizations.

  • 39.
    Pang, Xiaodan
    et al.
    KTH Royal Institute of Technology, Sweden.
    Zhang, Li
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Schats, Richard
    KTH Royal Institute of Technology, Sweden.
    Xiao, Shilin
    Shanghai Jiao Tong Universuity, China.
    Hu, Weisheng
    Shanghai Jiao Tong Universuity, China.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Key technologies to enable terabit-scale digital radio-over-fiber systems2019Inngår i: Proceedings of SPIE - The International Society for Optical Engineering, 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    With the approach of the 5G era, stringent requirements are imposed on the data transport solutions, including both of the supported transmission reach and the capacity. Radio-over-fiber technologies are considered to be promising candidates to cope with both aspects, owing to the low-loss and broad-bandwidth nature of the optical fibers. Meanwhile with such optical transport solutions, signals can be collected from the distributed remote radio sites and processed in a centralized manner. In this report, we target on the digital radio-over-fiber systems, and discuss about several key technologies, focusing on the aspects of coding and transmission, which could potentially enable terabit-scale data transport.

  • 40.
    Pang, Xiodang
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Gaiarin, Simone
    DTU Technical University of Denmark, Denmark.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Iglesias Olmedo, Miguel
    KTH Royal Institute of Technology, Sweden.
    Schatz, Ricard
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Zibar, Darko
    DTU Technical University of Denmark, Denmark.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Experimental Study of 1.55-μ m EML-Based Optical IM/DD PAM-4/8 Short Reach Systems2017Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 29, nr 6, s. 523-526, artikkel-id 7839925Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We experimentally evaluate high-speed intensity modulation/direct detection (IM/DD) transmissions with a 1.55-μ text broadband electro-Absorption modulated laser and pulse amplitude modulations (PAM). We demonstrate 80 Gb/s/ λ PAM-4 and 96 Gb/s/ λ PAM-8 transmissions with low-complexity digital equalizers at the receiver. Performance comparison with different types of equalizers are performed, including linear symbol-spaced feed-forward equalizer (FFE), fractional (half-symbol) spaced FFE and decision feedback equalizer (DFE), with different tap number. It is found that for both cases, a 6-Tap symbol-spaced FFE is sufficient to achieve a stable performance with bit-error-rate below the 7% overhead hard decision forward error correction (7%-OH HD-FEC) threshold over a 4 km standard single mode fiber link. Practical considerations including comparison between adaptive and static equalizer implementation and tolerable fiber chromatic dispersion are discussed.

  • 41.
    Popov, Sergei
    et al.
    KTH Royal Institute of Technology, Sweden.
    Marinins, Aleksandrs
    KTH Royal Institute of Technology, Sweden.
    Sychugov, Ilya
    KTH Royal Institute of Technology, Sweden.
    Yan, Max
    KTH Royal Institute of Technology, Sweden.
    Vasileva, Elena
    KTH Royal Institute of Technology, Sweden.
    Li, Yuanyuann
    KTH Royal Institute of Technology, Sweden.
    Berglund, Lars
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Polymer photonics and nano-materials for optical communication2018Inngår i: 2018 17th Workshop on Information Optics, WIO 2018, Institute of Electrical and Electronics Engineers Inc. , 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Polymer materials offer process compatibility, design flexibility, and low cost technology as a multi-functional platform for optical communication and photonics applications. Design and thermal reflowing technology of low loss polymer waveguides, as well as demonstration of transparent wood laser are presented in this paper.

  • 42.
    Rosa, Pawel
    et al.
    National Institute of Telecommunication, Poland ; Instituto de Óptica, Spain.
    Rizzelli, Guiseppe
    Instituto de Óptica, Spain.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Tan, Mingming
    Aston Institute of Photonic Technologies, UK.
    Sergeyev, Sergey
    Aston Institute of Photonic Technologies, UK.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Ania-Castañón, Juan Diego
    Instituto de Óptica, Spain.
    Unrepeatered 64QAM over SMF-28 using Raman Amplification and Digital Backpropagation2017Inngår i: Asia Communications and Photonics Conference, ACP, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Unrepeatered transmission over SMF-28 fibre is investigated using Raman based amplification. Experiments and simulations demonstrate a transmission up to 200 km (41 dB) span length using 28Gbaud 64 QAM modulation employing digital back propagation in DSP. © OSA 2017.

  • 43.
    Udalcovs, Aleksejs
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. Riga Technical University, Latvia.
    Levantesi, Marco
    Politecnico di Torino, Italy.
    Gaudino, Roberto
    Politecnico di Torino, Italy.
    Urban, Patryk
    Ericsson AB, Sweden.
    Mello, Darli
    University of Campinas, Brazil.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Monti, Paolo
    KTH Royal Institute of Technology, Sweden.
    An Insight into the Total Cost of Ownership of 5G Fronthauling2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper provides an assessment of the total cost of ownership (TCO) of a number of 5G fronthauling solutions based on digital and analog radio-over-fiber (RoF) architectures in cloud radio access network (C-RAN). We computed the capital and operational expenditures (CAPEX, OPEX) in the case of an optical fiber aggregation network based on a ring topology. Three different RoF architectures were considered: intermediate frequency analog RoF (IF-A-RoF), digital signal processing assisted analog RoF (DSP-A-RoF), and digital RoF (D-RoF) based on the common public radio interface (CPRI). A greenfield scenario considering both fiber deployment and fiber leasing was analyzed. The results presented in the paper show how the TCO changes with the number of aggregated carriers for the considered RoF architectures and fiber deployment strategy. They also reveal the impact that each cost category has on the overall CAPEX and OPEX value.

  • 44.
    Udalcovs, Aleksejs
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    Infinera, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Djupsjöbacka, Anders
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    Yangtze Optical Fiber and Cable Joint Ltd, China.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Inter-Core Crosstalk in Multicore Fibers: Impact on56−Gbaud/λ /Core PAM-4 Transmission2018Inngår i: 2018 European Conference on Optical Communication (ECOC), 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We experimentally demonstrate the impact of inter-core crosstalk in multicore fibers on 56-Gbaud PAM-4 signal quality after 2.5-km transmission over a weakly-coupled and uncoupled seven-core fibers, revealing the crosstalk dependence on carrier central wavelength in range of 1540-1560 nm.

  • 45.
    Udalcovs, Aleksejs
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Levantesi, Marco
    KTH Royal Institute of Technology, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Djupsjöbacka, Anders
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Mårtensson, Jonas
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Weijun, Tong
    Yangtze Optical Fiber and Cable Joint Stock Ltd, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Towards Coherent Detection in SDM-based Optical Access Networks2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    To tackle the continued increase in capacity demand in optical access, self-homodyne coherent detection (SHCD) is being considered as a candidate solution, utilizing a spatial division multiplexing (SDM) in a low-crosstalk multicore fiber (MCF) [1, 2] and high-order modulation formats such as quadrature phase-shift keying (QPSK), 16-levels quadrature amplitude modulation (16-QAM) or even 64-levels QAM (64-QAM) . The latest imposes strict requirements on both the performance of digital signal processing (DSP) and the spectral purity of the free running lasers [4–6]. Although a SHCD scheme relaxes the laser linewidth requirements, eliminates the need for a carrier frequency tracking, the necessity for a carrier phase estimation remains if high-order constellations are considered. The reasons for that are (1) residual phase noise in a system and (2) a closer location of the constellation points in the complex plane, which leads to a significantly lower phase noise tolerance as compared to QPSK or even 16-QAM signals . Therefore, it is of crucial importance to propose a low-complexity (and low-latency) phase estimation algorithms for these scenarios as well, especially because traditional algorithms cannot be directly employed for 64QAM. During this presentation,

    first, we overview our recent activities on designing and experimental validation of a high-performance and a low-complexity DSP block, focusing on carrier phase recovery (CPR) suitable for circular and square m-QAM constellations. For more information about the efficient CPR schemes for m-QAM, we recommend the

    OFC2017 and ACP2017 proceedings.

    Second, after the efficient CPR scheme is explained, we provide an insight into a solution of SDM-based optical access network where self-homodyne coherent detection (SHCD) scheme with our novel low-complexity CPR is implemented for a 28-Gbaud 16-QAM and 64- QAM transmission in downstream links with a goal to improve their spectral efficiency and to increase a phase-noise tolerance, which paves the way towards higher cost-efficiency. The proposed architecture together with the experimental demonstration is given in

    CLEO2018 conference proceedings

  • 46.
    Udalcovs, Aleksejs
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Djupsjobacka, Anders
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Mårtensson, Jonas
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    Yangtze Optical Fiber and Cable Joint Stock Limited Company, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    MCF-enabled self-homodyne 16/64QAM transmission for SDM optical access networks2018Inngår i: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper SM4C.5, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We experimentally demonstrate a 28-Gbaud circular and square 16/64QAM transmission over a 33.6-km long seven-core fiber with the LO passed through one of the cores for self-homodyne coherent detection employing a low-complexity digital signal processing.

  • 47.
    Udalcovs, Aleksejs
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Monti, Paolo
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Kakkar, Aditya
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Louchet, Henri
    Keysight Technologies Deutschland GmbH, Germany.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Wosinska, Lena
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Quantifying spectral and energy efficiency limitations of WDM networks due to crosstalk in optical nodes2017Inngår i: Asia Communications and Photonics Conference, ACP, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate the significant impact of crosstalk between add and drop ports at optical nodes on energy-efficiency per Hertz in WDM networks employing 32/64 Gbd DP-16QAM transmission, especially when the isolation is reduced to 30dB.

  • 48.
    Udalcovs, Aleksejs
    et al.
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Wosinska, Lena
    KTH Royal Institute of Technology, Sweden.
    Monti, Paolo
    KTH Royal Institute of Technology, Sweden.
    Analysis of Spectral and Energy Efficiency Tradeoff in Single-Line Rate WDM Links2017Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, nr 10, s. 1847-1857, artikkel-id 7812686Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper investigates, through simulations, the tradeoff between energy efficiency (EE) and the overall spectral efficiency (SE) of fiber optic links for a given capacity and a link length. The comparison is made for various modulation formats, span lengths, and with/without using forward error correction (FEC). The power consumption of the different system components is estimated from the data sheets of the state-of-the-art equipment. Results show that the use of long single-mode fiber spans (i.e., more than 40 km) improves EE when coherent modulation formats are used. However, with noncoherent formats, the span length must be selected depending on SE, aggregated traffic amount needs to be transmitted, and link length. For almost all modulation formats, FEC reduces the overall energy consumption despite being one of the main power consumers in fiber optic communication systems. The power consumption of 3Rs becomes particularly important when the linear crosstalk limits the system reach. In all other cases, the power consumption of transponders and optical line amplifiers is dominating, but their contribution changes depending on the aggregated traffic amount and system reach.

  • 49.
    Udalcovs, Aleksejs
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    Shanghai Jiao Tong University, China.
    Djupsjoback, Anders
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Xiao, Shilin
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Towards 25+Gbpsλ IM-DD PON: NRZ, duobinary, PAM4, and DMT transmission and optical budget comparison2019Inngår i: International Conference on Transparent Optical Networks, IEEE Computer Society , 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    While infrastructure providers are expanding their portfolio to offer a sustainable solution for beyond 10 Gbps in optical access network segment, we compare experimentally several alternatives that may be used in future passive optical networks (PONs) to deliver 25+ Gbps net-rates. As promising candidates, we consider the intensity modulation direct detection (IM-DD) systems employing the following modulation formats: (i) duobinary, (ii) 4-level pulse amplitude modulation (PAM4), and (iii) discrete multitone (DMT), which are all more bandwidth efficient than the non-return-to-zero (NRZ) in current 10G PON solutions. In this paper, we focus on the optical budget after transmission over a 20 km single-mode fiber (SMF) link in C-band and discuss the intrinsic imperfections of optical components that may significantly reduce the received signal quality.

  • 50.
    Xue, Lei
    et al.
    Chalmers University of Technology, Sweden; Shanghai Jiao Tong University, China .
    Yi, Lilin
    Shanghai Jiao Tong University, China .
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden; Shanghai Jiao Tong University, China .
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden .
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. Infinera, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden .
    50-Gb/s Dispersion-unmanaged DMT Transmission with Injection Locked 10G-class 1.55-μm DML2019Inngår i: Conference on Lasers and Electro-Optics OSA Technical Digest (Optical Society of America, 2019), paper SW4O.2, OSA - The Optical Society , 2019, artikkel-id SW4O.2Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate 50-Gb/s DMT signal transmission over 20-km SMF by using a 10G-class 1.55-μm DML without optical dispersion compensation. Injection locking technique is introduced, which doubles system bandwidth and greatly suppresses DML chirp. © 2019 The Author(s)

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