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  • 1. Aurelius, A
    et al.
    Berntson, A
    RISE, Swedish ICT, Acreo.
    Djupsjöbacka, A
    RISE, Swedish ICT, Acreo.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    New Method for Measuring Probablility Density Function of Modulated Optical Signals, demonstrated on EDFA SOA2006In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 27, no 3, p. 168-71Article in journal (Refereed)
  • 2.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Error-rate floors in intradyne QPSK systems with quadruple phase extraction – comparison of block sliding Processor Unit update2011In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 31, p. 180-3Article in journal (Refereed)
  • 3.
    Jacobsen, G
    et al.
    RISE, Swedish ICT, Acreo.
    Carlsson, A
    Berntson, A
    RISE, Swedish ICT, Acreo.
    New rigorous model for Rx ISI effects in WDM systems2004In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 25, no 6, p. 241-45Article in journal (Refereed)
  • 4.
    Jacobsen, G
    et al.
    RISE, Swedish ICT, Acreo.
    Kazovsky, LG
    Xu, T
    Popov, S
    Li, J
    RISE, Swedish ICT, Acreo.
    Zhang, Y
    RISE, Swedish ICT, Acreo.
    Friberg, AT
    Phase noise influence in optical OFDM systems employing RF pilot tone for phase noise cancellation2011In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 32, p. 141-5Article in journal (Refereed)
  • 5.
    Jacobsen, G
    et al.
    RISE, Swedish ICT, Acreo.
    Lidon, M
    Xu, T
    Popov, S
    Friberg, AT
    Zhang, Y
    RISE, Swedish ICT, Acreo.
    Influence of Pre- Post-compensation of Chromatic Dispersion on Equalization Enhanced Phase Noise in Coherent Multilevel Systems2011In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 32Article in journal (Refereed)
  • 6.
    Jacobsen, G
    et al.
    RISE, Swedish ICT, Acreo.
    Vanin, E
    RISE, Swedish ICT, Acreo.
    Forzati, M
    RISE, Swedish ICT, Acreo.
    Wang, L
    Practical design model of DnPSK systems using direct BER counting rigorous BER modeling2008In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 29, no 4, p. 226-Article in journal (Refereed)
  • 7.
    Jacobsen, G
    et al.
    RISE, Swedish ICT, Acreo.
    Xu, T
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Sergeyev, S.
    Aston University, UK.
    Phase noise influence in coherent optical DnPSK systems with DSP based dispersion compensation2014In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 35, no 1, p. 57-Article in journal (Refereed)
    Abstract [en]

    We present a comparative study of the influence of dispersion induced phase noise for n-level PSK systems. From the analysis, we conclude that the phase noise influence for classical homodyne/heterodyne PSK systems is entirely determined by the modulation complexity (expressed in terms of constellation diagram) and the analogue demodulation format. On the other hand, the use of digital signal processing (DSP) in homodyne/intradyne systems renders a fiber length dependence originating from the generation of equalization enhanced phase noise. For future high capacity systems, high constellations must be used in order to lower the symbol rate to practically manageable speeds, and this fact puts severe requirements to the signal and local oscillator (LO) linewidths. Our results for the bit-error-rate (BER) floor caused by the phase noise influence in the case of QPSK, 16PSK and 64PSK systems outline tolerance limitations for the LO performance: 5 MHz linewidth (at 3-dB level) for 100 Gbit/s QPSK; 1 MHz for 400 Gbit/s QPSK; 0.1 MHz for 400 Gbit/s 16PSK and 1 Tbit/s 64PSK systems. This defines design constrains for the phase noiseimpact in distributed-feed-back (DFB) or distributed-Bragg-reflector (DBR) semiconductor lasers, that would allow moving the system capacity from 100 Gbit/s system capacity to 400 Gbit/s in 3 years (1 Tbit/s in 5 years). It is imperative at the same time to increase the analogue to digital conversion (ADC) speed such that the single quadrature symbol rate goes from today's 25 GS/s to 100 GS/s (using two samples per symbol). 

  • 8.
    Leong, M. Y.
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Jacobsen, G.
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Sergeyev, S.
    Aston University, UK.
    Receiver Sensitivity in Optical Microwave, Heterodyne Homodyne Systems2014In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 35, no 3, p. 221-Article in journal (Refereed)
    Abstract [en]

    In this paper, we analyze the sensitivities of coherent optical receivers and microwave receivers. We derive theoretical limits of signal-to-noise ratio and bit error rate. By applying a generic approach to a broad range of receivers, we can compare their performance directly. Other publications have considered some of these receivers. However, their diverse nature obscures the big picture. Using our results as a unifying platform, previous publications can be compared and discrepancies between them identified. 

  • 9.
    Leong, Miu Y.
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Larsen, Knud J.
    DTU Technical University of Denmark, Denmark.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Zibar, Darko
    DTU Technical University of Denmark, Denmark.
    Sergeyev, Sergey
    Aston University, UK.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    BCH Codes for Coherent Star DQAM Systems with Laser Phase Noise2017In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 38, no 1, p. 47-56Article in journal (Refereed)
    Abstract [en]

    Coherent optical systems have relatively high laser phase noise, which affects the performance of forward error correction (FEC) codes. In this paper, we propose a method for selecting Bose-Chaudhuri-Hocquenghem (BCH) codes for coherent systems with star-shaped constellations and M-ary differential quadrature amplitude modulation (DQAM). Our method supports constellations of any order M which is a power of 2, and includes differential M-ary phase shift keying as a special case. Our approach is straightforward, requiring only short pre-FEC simulations to parameterize a statistical model, based on which we select codes analytically. It is applicable to pre-FEC bit error rates (BERs) of around 10-3. We evaluate the accuracy of our approach using numerical simulations. For a target post-FEC BER of 10-5, codes selected with our method yield BERs within 2× target. Lastly, we extend our method to systems with interleaving, which enables us to use codes with lower overhead.

  • 10. Xu, T
    et al.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Popov, S
    Forzati, M
    RISE, Swedish ICT, Acreo.
    Mårtensson, J
    RISE, Swedish ICT, Acreo.
    Mussolin, M
    Li, J
    RISE, Swedish ICT, Acreo.
    Wang, K
    Zhang, Y
    RISE, Swedish ICT, Acreo.
    Friberg, AT
    Frequency-domain Chromatic Dispersion Equalization using Overlap-add Methods in Coherent Optical System2011In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 21, p. 131-5Article in journal (Refereed)
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