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Estarán, J., Mardoyan, H., Jorge, F., Ozolins, O., Udalcovs, A., Konczykowska, A., . . . Bigo, S. (2019). 140/180/204-Gbaud OOK Transceiver for Inter- and Intra-Data Center Connectivity. Journal of Lightwave Technology, 37(1), 178-187, Article ID 8500133.
Open this publication in new window or tab >>140/180/204-Gbaud OOK Transceiver for Inter- and Intra-Data Center Connectivity
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2019 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, no 1, p. 178-187, article id 8500133Article in journal (Refereed) Published
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.

Keywords
Modulation, Transceivers, Indium phosphide, III-V semiconductor materials, Bandwidth, Optical fiber dispersion, Distributed feedback devices, Data center interconnects, electro-absorption modulation, InP, integrated circuits, optical fiber communication, very high-speed modulation
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37642 (URN)10.1109/JLT.2018.2876732 (DOI)
Available from: 2019-01-29 Created: 2019-01-29 Last updated: 2019-06-28Bibliographically approved
Xue, L., Yi, L., Zhang, L., Ozolins, O., Udalcovs, A., Pang, X. & Chen, J. (2019). 50-Gb/s Dispersion-unmanaged DMT Transmission with Injection Locked 10G-class 1.55-μm DML. In: Conference on Lasers and Electro-Optics OSA Technical Digest (Optical Society of America, 2019), paper SW4O.2: . Paper presented at CLEO: Science and Innovations, CLEO_SI 2019, 5 May 2019 through 10 May 2019. OSA - The Optical Society, Article ID SW4O.2.
Open this publication in new window or tab >>50-Gb/s Dispersion-unmanaged DMT Transmission with Injection Locked 10G-class 1.55-μm DML
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2019 (English)In: Conference on Lasers and Electro-Optics OSA Technical Digest (Optical Society of America, 2019), paper SW4O.2, OSA - The Optical Society , 2019, article id SW4O.2Conference paper, Published paper (Refereed)
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)

Place, publisher, year, edition, pages
OSA - The Optical Society, 2019
Keywords
Injection locked, Injection-locking, Optical dispersion compensation, Signal transmission, System bandwidth
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39377 (URN)10.1364/CLEO_SI.2019.SW4O.2 (DOI)2-s2.0-85068112123 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Science and Innovations, CLEO_SI 2019, 5 May 2019 through 10 May 2019
Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-07-08Bibliographically approved
Xue, L., Yi, L., Zhang, L., Ozolins, O., Udalcovs, A., Pang, X. & Chen, J. (2019). 50-Gb/S Dispersion-Unmanaged DMT Transmission with Injection Locked L0G-Class L.55-μm DML. In: 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings: . Paper presented at 2019 Conference on Lasers and Electro-Optics, CLEO 2019, 5 May 2019 through 10 May 2019. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>50-Gb/S Dispersion-Unmanaged DMT Transmission with Injection Locked L0G-Class L.55-μm DML
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2019 (English)In: 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019Conference paper, Published paper (Refereed)
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) 2019 OSA.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39663 (URN)10.23919/CLEO.2019.8750190 (DOI)2-s2.0-85069221596 (Scopus ID)9781943580576 (ISBN)
Conference
2019 Conference on Lasers and Electro-Optics, CLEO 2019, 5 May 2019 through 10 May 2019
Note

Funding details: 722429; Funding text 1: Acknowledgements: This work is funded by the EU H2020 5G STEP-FWD (grant 722429), the SJTU-KTH seed grant and VR “PHASE” grant.

Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-08-08Bibliographically approved
Pang, X., Ozolins, O., Zhang, L., Udalcovs, A., Lin, R., Schatz, R., . . . Chen, J. (2019). Beyond 200 Gbps Per Lane Intensity Modulation Direct Detection (IM/DD) Transmissions for Optical Interconnects: Challenges and Recent Developments. In: 2019 Optical Fiber Communications Conference and Exhibition (OFC): . Paper presented at 2019 Optical Fiber Communications Conference and Exhibition (OFC)San Diego, California United States 3–7 March 2019.
Open this publication in new window or tab >>Beyond 200 Gbps Per Lane Intensity Modulation Direct Detection (IM/DD) Transmissions for Optical Interconnects: Challenges and Recent Developments
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2019 (English)In: 2019 Optical Fiber Communications Conference and Exhibition (OFC), 2019Conference paper, Published paper (Refereed)
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.

Keywords
Modulation, Bandwidth, Optical interconnections, Complexity theory, Optical distortion, Lasers, Optical filters
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38590 (URN)10.1364/ofc.2019.w4i.7 (DOI)2-s2.0-85065482196 (Scopus ID)978-1-943580-53-8 (ISBN)
Conference
2019 Optical Fiber Communications Conference and Exhibition (OFC)San Diego, California United States 3–7 March 2019
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2019-08-14Bibliographically approved
Lin, R., Udalcovs, A., Ozolins, O., Tang, M., Fu, S., Popov, S., . . . Chen, J. (2019). Embedding quantum key distribution into optical telecom communication systems. In: International Conference on Transparent Optical Networks: . Paper presented at 21st International Conference on Transparent Optical Networks, ICTON 2019, 9 July 2019 through 13 July 2019. IEEE Computer Society
Open this publication in new window or tab >>Embedding quantum key distribution into optical telecom communication systems
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2019 (English)In: International Conference on Transparent Optical Networks, IEEE Computer Society , 2019Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
IEEE Computer Society, 2019
Keywords
Embeddings, Fiber optic networks, Optical communication, Transparent optical networks, Massive deployment, One time pads, Recent progress, Sensitive informations, Telecom, Unconditional security, Quantum cryptography
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-40530 (URN)10.1109/ICTON.2019.8840512 (DOI)2-s2.0-85073057397 (Scopus ID)9781728127798 (ISBN)
Conference
21st International Conference on Transparent Optical Networks, ICTON 2019, 9 July 2019 through 13 July 2019
Note

 Funding details: Swedish Foundation for International Cooperation in Research and Higher Education, STINT; Funding details: Göran Gustafssons Stiftelse för Naturvetenskaplig och Medicinsk Forskning; Funding details: Vetenskapsrådet, VR, 2016-04489, VR 2017-04470; Funding details: Stiftelsen för Strategisk Forskning, SSF; Funding text 1: This work is supported by Swedish Research Council (VR 2017-04470, 2016-04489), the Swedish Foundation for Strategic Research (SSF), the Göran Gustafsson Foundation, the Swedish ICT-TNG, and Swedish Foundation for International Cooperation in Research and Higher Education (STINT).

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17Bibliographically approved
Deniel, L., Gay, M., Pérez-Galacho, D., Baudot, C., Bramerie, L., Ozolins, O., . . . Marris-Morini, D. (2019). Generation of O-band PAM-4 signal using a silicon modulator driven by two binary sequences. In: Proceedings of SPIE - The International Society for Optical Engineering: . Paper presented at Silicon Photonics XIV 2019, 4 February 2019 through 6 February 2019. SPIE
Open this publication in new window or tab >>Generation of O-band PAM-4 signal using a silicon modulator driven by two binary sequences
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2019 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Silicon photonics is a promising solution for next generation of short-range optical communication systems. Silicon modulators have driven an important research activity over the past years, and many transmission links using on-off keying modulation format (OOK) were successfully demonstrated with a large diversity of modulator structures. In order to keep up with the demand of increasing bitrates for limited bandwidths in Datacom applications, higher modulation formats are explored, such as quadrature phase shift keying (QPSK) or 4-level pulse amplitude modulation (PAM-4). However, driving the modulators to generate PAM-4 signals commonly require expensive and power-hungry electronic devices such as digital-to-analog converters (DACs) for pulse-shaping and digital signal processors (DSP) for nonlinearity compensation. Lastly, new solutions were studied to overcome this issue, including new driving methods based on the use of two different input binary sequences applied directly on the modulator. While most of the reported works are focused on the C-band of communication, the O-band can present a definitive advantage due to the low dispersion of standard single-mode (SSMF) fiber. For those reasons, we demonstrate the generation of a 10-Gbaud DAC-less PAM-4 signal in the O-band using a depletion-based silicon traveling wave Mach-Zehnder modulator (TWMZM). An open eye diagram was obtained, and a bit error rate (BER) of 3.8×10 -3 was measured for a received optical power of about-6 dBm.

Place, publisher, year, edition, pages
SPIE, 2019
Keywords
Mach Zehnder modulator, Modulator, O-band, PAM-4, Silicon photonics, Binary sequences, Bit error rate, Digital devices, Digital signal processors, Digital to analog conversion, Light modulation, Modulators, Optical communication, Photonic devices, Pulse amplitude modulation, Pulse shaping, Quadrature phase shift keying, Datacom applications, Digital signal processors (DSP), Non-linearity compensation, On-off keying modulations, Quadrature phaseshift keying (QPSK), Research activities, Silicon modulators, Light modulators
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38916 (URN)10.1117/12.2507430 (DOI)2-s2.0-85065438112 (Scopus ID)9781510624887 (ISBN)
Conference
Silicon Photonics XIV 2019, 4 February 2019 through 6 February 2019
Note

Funding details: H2020-ICT-27-2015-688516; Funding text 1: This work was supported by the European project Cosmicc (H2020-ICT-27-2015-688516).

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-13Bibliographically approved
Jia, S., Lo, M., Zhang, L., Ozolins, O., Udalcovs, A., Kong, D., . . . Oxenlowe, L. K. (2019). Integrated Dual-DFB Laser for 408 GHz Carrier Generation Enabling 131 Gbit/s Wireless Transmission over 10.7 Meters. In: 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019 - Proceedings: . Paper presented at 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019, 3 March 2019 through 7 March 2019. Institute of Electrical and Electronics Engineers Inc., Article ID 8697005.
Open this publication in new window or tab >>Integrated Dual-DFB Laser for 408 GHz Carrier Generation Enabling 131 Gbit/s Wireless Transmission over 10.7 Meters
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2019 (English)In: 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019, article id 8697005Conference paper, Published paper (Refereed)
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

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Distributed feedback lasers, Optical fibers, Carrier generation, Monolithically integrated, Nonlinear equalization, Single channels, Wireless transmissions, Optical fiber communication
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38972 (URN)10.1364/ofc.2019.th1c.2 (DOI)2-s2.0-85065482808 (Scopus ID)9781943580538 (ISBN)
Conference
2019 Optical Fiber Communications Conference and Exhibition, OFC 2019, 3 March 2019 through 7 March 2019
Note

Funding details: Zhejiang University; Funding details: Kungliga Tekniska Högskolan; Funding details: Shanghai Jiao Tong University, guiller@ing.uc3m.es;; Funding details: Institute of Infection and Immunity; Funding details: DNRF123; Funding details: H2020 Marie Skłodowska-Curie Actions, 642355 FiWiN5G; Funding details: 713683; Funding details: VINNOVA; Funding details: Vetenskapsrådet; Funding details: Göran Gustafssons Stiftelse för Naturvetenskaplig och Medicinsk Forskning; Funding details: Stiftelsen för Strategisk Forskning; Funding details: 752826; Funding details: China Postdoctoral Science Foundation, 2017M611990; Funding details: National Natural Science Foundation of China, 61671212, 61722108, 61775137, 61771424, 61331010; Funding text 1: 1DTU Fotonik, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark 2Universidad Carlos III de Madrid, 28911 Leganés, Madrid, Spain 3KTH Royal Institute of Technology, 164 40 Kista, Sweden 4NETLAB, Research Institutes of Sweden AB, 164 25 Kista, Sweden 5College of Information Science and EE, Zhejiang University, Hangzhou 310027, China 6School of SE-IEE, Shanghai Jiao Tong University, Shanghai 200240, China Author e-mail address: shijai@fotonik.dtu.dk; huhao@fotonik.dtu.dk; guiller@ing.uc3m.es; xiaodan@kth.se; Funding text 2: We would like to thank the support by the EU H2020 Marie Sklodowska-Curie grant agreement no. 713683 (COFUNDfellowsDTU), the EU H2020 Marie Skłodowska-Curie Grant agreement no. 642355 FiWiN5G, the Danish center of excellence CoE SPOC under Grant DNRF123, the Villum young investigator program grant of 2MAC and the China Postdoctoral Science Foundation under Grant 2017M611990, the Swedish Research Council (VR), the Swedish Foundation for Strategic Research (SSF), Göran Gustafsson Foundation, the Swedish ICT TNG, the EU H2020 MCSA-IF Project NEWMAN (#752826), VINNOVA funded SENDATE-EXTEND and SENDATE-FICUS, National Natural Science Foundation of China (#61331010, 61722108, 61775137, 61671212, 61771424).

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-08-14Bibliographically approved
Pang, X., Zhang, L., Ozolins, O., Udalcovs, A., Lin, R., Schats, R., . . . Chen, J. (2019). Key technologies to enable terabit-scale digital radio-over-fiber systems. In: Proceedings of SPIE - The International Society for Optical Engineering: . Paper presented at Broadband Access Communication Technologies XIII 2019, 4 February 2019 through 5 February 2019.
Open this publication in new window or tab >>Key technologies to enable terabit-scale digital radio-over-fiber systems
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2019 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, 2019Conference paper, Published paper (Refereed)
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.

Keywords
coding, Digital radio-over-fiber, fiber optics communications, modulation, radio frequency photonics, 5G mobile communication systems, Optical fibers, Radio transmission, Radio-over-fiber, Broad bandwidths, Fiber optics communication, Key technologies, Optical transport, Radio-over-fiber technology, Stringent requirement, Digital radio
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38232 (URN)10.1117/12.2509281 (DOI)2-s2.0-85062497561 (Scopus ID)9781510625327 (ISBN)
Conference
Broadband Access Communication Technologies XIII 2019, 4 February 2019 through 5 February 2019
Note

; Funding details: Göran Gustafssons Stiftelse för Naturvetenskaplig och Medicinsk Forskning; Funding details: Vetenskapsrådet; Funding details: VINNOVA; Funding details: Stiftelsen för Strategisk Forskning; Funding details: 752826; Funding details: State Key Laboratory of Advanced Optical Communication Systems and Networks., 2018GZKF03001; Funding details: National Natural Science Foundation of China, 61671212, 61722108, 61775137, 61331010; Funding text 1: This work was partly supported by the EU H2020 MCSA-IF Project NEWMAN (#752826), Swedish Research Council (VR), the Swedish Foundation for Strategic Research (SSF), Göran Gustafsson Foundation, the Swedish ICT-TNG, VINNOVA funded SENDATE-EXTEND and SENDATE-FICUS, National Natural Science Foundation of China (#61331010, 61722108, 61775137, 61671212), SJTU State Key Laboratory of Advanced Optical Communication System and Networks Open project 2018GZKF03001.

Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02Bibliographically approved
Ozolins, O., Pang, X., Udalcovs, A., Zhang, L., Schatz, R., Westergren, U., . . . Popov, S. (2019). Multilevel modulation at 100 gbaud for short reach C-band links. In: International Conference on Transparent Optical Networks: . Paper presented at 21st International Conference on Transparent Optical Networks, ICTON 2019, 9 July 2019 through 13 July 2019. IEEE Computer Society
Open this publication in new window or tab >>Multilevel modulation at 100 gbaud for short reach C-band links
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2019 (English)In: International Conference on Transparent Optical Networks, IEEE Computer Society , 2019Conference paper, Published paper (Refereed)
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. 

Place, publisher, year, edition, pages
IEEE Computer Society, 2019
Keywords
Bandwidth, Cost effectiveness, Decision feedback equalizers, Fiber optic networks, Modulation, Optical interconnects, Optical signal processing, Pulse amplitude modulation, Single mode fibers, Attractive solutions, Bandwidth scalability, Building blockes, Economic challenges, Experimental demonstrations, Multilevel modulation, Optical amplifications, Standard single mode fibers, Transparent optical networks
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-40528 (URN)10.1109/ICTON.2019.8840340 (DOI)2-s2.0-85073070060 (Scopus ID)9781728127798 (ISBN)
Conference
21st International Conference on Transparent Optical Networks, ICTON 2019, 9 July 2019 through 13 July 2019
Note

Funding details: Vetenskapsrådet, VR, 2016-04510; Funding details: 752826, 2017-01559; Funding text 1: This work is supported by the Swedish Research Council (VR) projects 2016-04510 “PHASE”, EU H2020 MCSA-IF Project NEWMAN (#752826), and the Vinnova funded Celtic Plus sub-project C2015/3-5 SENDATE-FICUS and Vinnova funded 2017-01559 “Utvecklingscentrum för mjukvarustyrda optiska accessnät”. The Knut and Alice Wallenberg is acknowledged for equipment funding as well as Tektronix and Keysight Technologies for equipment loan.

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17Bibliographically approved
Zhang, L., Kerrebrouck, J. V., Lin, R., Pang, X., Udalcovs, A., Ozolins, O., . . . Yin, X. (2019). Nonlinearity Tolerant High-speed DMT Transmission with 1.5-μm Single-mode VCSEL and Multi-core Fibers for Optical Interconnects. Journal of Lightwave Technology, 37(2), 380-388
Open this publication in new window or tab >>Nonlinearity Tolerant High-speed DMT Transmission with 1.5-μm Single-mode VCSEL and Multi-core Fibers for Optical Interconnects
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2019 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, no 2, p. 380-388Article in journal (Refereed) Published
Abstract [en]

We experimentally demonstrate the generation of 107-Gbit/s net-rate optical discrete multitone (DMT) signal using a 1.5-μm single-mode vertical cavity surface emitting laser (VCSEL) with modulation bandwidth of 22-GHz. Utilizing a nonlinearity-tolerant channel equalization algorithm for digital signal processing (DSP), total net-rates of 726.6-Gbit/s over 2.5-km dispersion-uncompensated 7-core fiber and 533.1-Gbit/s over 10-km dispersion-compensated 7-core fiber below 7% overhead hard-decision forward error correction (HD-FEC) limit have been experimentally achieved with a 1.5-μm VCSEL based intensity-modulation direct-detection (IM/DD) system. The features of the 1.5-μm single-mode VCSEL, 2.5-km/10km multi-core fibers and fan-in/fan-out modules are presented. Besides, the Volterra series based nonlinearity-tolerant channel equalization algorithm, which improves the signal-to-noise ratio (SNR) with more than 5-dB, is mathematically described and experimentally validated. The results have demonstrated that 1.5-μm single-mode VCSEL and multi-core fiber based transmission can be a promising candidate to solve the capacity challenges in short-reach optical interconnects.

Keywords
Vertical cavity surface emitting lasers, Optical fibers, High-speed optical techniques, Optical fiber dispersion, Optical fiber networks, Vertical cavity surface emitting laser (VCSEL), discrete multitone (DMT), multi-core fiber (MCF), digital signal processing (DSP), Volterra series model, nonlinearity-tolerant channel equalization
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34343 (URN)10.1109/JLT.2018.2851746 (DOI)
Available from: 2018-08-07 Created: 2018-08-07 Last updated: 2019-07-01Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9839-7488

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