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  • 51. Xu, T
    et al.
    Jacobsen, G
    RISE., Swedish ICT, Acreo.
    Popov, S
    Li, J
    RISE., Swedish ICT, Acreo.
    Vanin, E
    RISE., Swedish ICT, Acreo.
    Wang, K
    Friberg, AT
    Zhang, Y
    RISE., Swedish ICT, Acreo.
    Chromatic dispersion compensation in coherent transmission system using digital filters2010Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 18, s. 16243-57Artikkel i tidsskrift (Fagfellevurdert)
  • 52.
    Yu, Z
    et al.
    RISE., Swedish ICT, Acreo.
    Malmström, M
    Sterner, Carola
    RISE., Swedish ICT, Acreo.
    Tarasenko, O
    RISE., Swedish ICT, Acreo.
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Fonjallaz, P-Y
    Dynamics of long-period gratings tuned with internal fiber electrodes2011Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 36, nr 5Artikkel i tidsskrift (Fagfellevurdert)
  • 53.
    Yu, Z
    et al.
    RISE., Swedish ICT, Acreo.
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Tarasenko, O
    RISE., Swedish ICT, Acreo.
    Knape, H
    Fonjallaz, P-Y
    Nanosecond switching of fiber Bragg gratings2007Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 15, nr 22, s. 14948-53Artikkel i tidsskrift (Fagfellevurdert)
  • 54.
    Yu, Z
    et al.
    RISE., Swedish ICT, Acreo.
     Tarasenko, O
    RISE., Swedish ICT, Acreo.
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Fonjallaz, P-Y
    Birefringence switching of Bragg gratings in fibers with internal electrodes2008Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 16, nr 11, s. 8229-35Artikkel i tidsskrift (Fagfellevurdert)
  • 55.
    Zafra, Sebastian Ortega
    et al.
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE., Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE., Swedish ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Sergeyev, Sergey V.
    Phase noise tolerance study in coherent optical circular QAM transmissions with Viterbi-Viterbi carrier phase estimation2014Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 22, nr 25, s. 30579-30585Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present a performance evaluation of a non-conventional approach to implement phase noise tolerant optical systems with multilevel modulation formats. The performance of normalized Viterbi-Viterbi carrier phase estimation (V-V CPE) is investigated in detail for circular m-level quadrature amplitude modulation (C-mQAM) signals. The intrinsic property of C-mQAM constellation points with a uniform phase separation allows a straightforward employment of V-V CPE without the need to adapt constellation. Compared with conventional feed-forward CPE for square QAM signals, the simulated results show an enhanced tolerance of linewidth symbol duration product (Delta vT(s)) at a low sensitivity penalty by using feed-forward CPE structure with C-mQAM. This scheme can be easily upgraded to higher order modulations without inducing considerable complexity.

  • 56.
    Zakrisson, Johan
    et al.
    Umeå University, Sweden.
    Silander, Isak
    Umeå University, Sweden.
    de Oliveira, V. S.
    Umeå University, Sweden.
    Hjältén, Adrian
    Umeå University, Sweden.
    Rosina, Andrea
    Umeå University, Sweden.
    Rubin, Tom
    PTB, Germany.
    Foltynowicz, Aleksandra
    Umeå University, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Axner, Ove
    Umeå University, Sweden.
    Procedure for automated low uncertainty assessment of empty cavity mode frequencies in Fabry-Pérot cavity based refractometry2024Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 32, nr 3, s. 3959-3973Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A procedure for automated low uncertainty assessment of empty cavity mode frequencies in Fabry-Pérot cavity based refractometry that does not require access to laser frequency measuring instrumentation is presented. It requires a previously well-characterized system regarding mirror phase shifts, Gouy phase, and mode number, and is based on the fact that the assessed refractivity should not change when mode jumps take place. It is demonstrated that the procedure is capable of assessing mode frequencies with an uncertainty of 30 MHz, which, when assessing pressure of nitrogen, corresponds to an uncertainty of 0.3 mPa. 

    Fulltekst (pdf)
    fulltext
  • 57.
    Zhang, Lu
    et al.
    Shanghai Jiao Tong University, China ; KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden (2017-2019), 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 (2017-2019), ICT, Acreo.
    Popov, Sergei
    Wosinska, Lena
    KTH Royal Institute of Technology, Sweden.
    Xiao, Shilin
    Shanghai Jiao Tong University, China.
    Hu, Weisheng
    Shanghai Jiao Tong University, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Digital mobile fronthaul employing differential pulse code modulation with suppressed quantization noise2017Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 25, nr 25, s. 31921-31936Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A differential pulse code modulation (DPCM) based digital mobile fronthaul architecture is proposed and experimentally demonstrated. By using a linear predictor in the DPCM encoding process, the quantization noise can be effectively suppressed and a prediction gain of 7~8 dB can be obtained. Experimental validation is carried out with a 20 km 15-Gbaud/λ 4-level pulse amplitude modulation (PAM4) intensity modulation and direct detection system. The results verify the feasibility of supporting 163, 122, 98, 81 20-MHz 4, 16, 64, 256 QAM based antenna-carrier (AxC) containers with only 3, 4, 5, 6 quantization bits at a sampling rate of 30.72MSa/s in LTE-A environment. Further increasing the number of quantization bits to 8 and 9, 1024 quadrature amplitude modulation (1024 QAM) and 4096 QAM transmission can be realized with error vector magnitude (EVM) lower than 1% and 0.5%, respectively. The supported number of AxCs in the proposed DPCM-based fronthaul is increased and the EVM is greatly reduced compared to the common public radio interface (CPRI) based fronthaul that uses pulse code modulation. Besides, the DPCM-based fronthaul is also experimentally demonstrated to support universal filtered multicarrier signal that is one candidate waveform for the 5th generation mobile systems.

  • 58.
    Zhang, Lu
    et al.
    Zhejiang University, China.
    Pang, Xiaodan
    Infinera, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Lin, Rui
    Chalmers University of Technology, Sweden.
    Yin, Xin
    Ghent University, Belgium.
    Tang, Ming
    Huazhong University of Sci&Tech, China.
    Tong, Weijun
    YOFC Yangtze Optical Fibre and Cable Company, China.
    Xiao, Shilin
    Shanghai Jiao Tong University, China.
    Chen, Jiajia
    Chalmers University of Technology, Sweden.
    Kernel mapping for mitigating nonlinear impairments in optical short-reach communications2019Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 27, nr 21, s. 29567-29580Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Nonlinear impairments induced by the opto-electronic components are one of the fundamental performance-limiting factors in high-speed optical short-reach communications, significantly hindering capacity improvement. This paper proposes to employ a kernel mapping function to map the signals in a Hilbert space to its inner product in a reproducing kernel Hilbert space, which has been successfully demonstrated to mitigate nonlinear impairments in optical short-reach communication systems. The operation principle is derived. An intensity modulation/direct detection system with 1.5-µm vertical cavity surface emitting laser and 10-km 7-core fiber achieving 540.68-Gbps (net-rate 505.31-Gbps) has been carried out. The experimental results reveal that the kernel mapping based schemes are able to realize comparable transmission performance as the Volterra filtering scheme even with a high order.

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