Nonlinear signal–noise interactions in dispersion-managed links with various modulation formats

Bononi, A.; Serena, Paolo; Rossi, N.

doi:10.1016/j.yofte.2009.11.001

Cited by 48 publications

(37 citation statements)

References 44 publications

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“…It is known that the transmission performance of a fiber-optical system will ultimately be limited by non-deterministic nonlinear effects, such as nonlinear signal-noise interaction (NSNI) between the transmitted signal and the amplified spontaneous emission (ASE) noise [17]- [19]. The impact of NSNI has been studied extensively through numerical simulations and through experiments [20], [21]. In these works, ASE noise is loaded at the receiver as a single additive white Gaussian noise (AWGN) process.…”

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confidence: 99%

“…In these works, ASE noise is loaded at the receiver as a single additive white Gaussian noise (AWGN) process. This system is then compared with a system where noise is distributed [20] and ASE noise is added as a single AWGN at the transmitter [21]. Both these studies revealed that there is a significant penalty due to NSNI for dispersion-managed links and the severity of the NSNI is dependent on the symbol rate and modulation formats used in the system.…”

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confidence: 99%

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Stochastic Digital Backpropagation

Irukulapati

Wymeersch

Johannisson

et al. 2014

IEEE Trans. Commun.

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In this paper, we propose a novel detector for singlechannel long-haul coherent optical communications, termed stochastic digital backpropagation (SDBP), which takes into account noise from the optical amplifiers in addition to handling deterministic linear and nonlinear impairments. We discuss the design approach behind this detector, which is based on the maximum a posteriori (MAP) principle. As closed-form expressions of the MAP detector are not tractable for coherent optical transmission, we employ the framework of Bayesian graphical models, which allows a numerical evaluation of the proposed detector. Through simulations, we observe that by accounting for nonlinear signal-noise interactions, we achieve a significant improvement in system reach with SDBP over digital backpropagation (DBP) for systems with periodic inline optical dispersion compensation. In uncompensated links with high symbol rates, the performance difference in terms of system reach for SDBP over DBP is small. In the absence of noise, the proposed detector is equivalent to the well-known DBP detector.

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confidence: 99%

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Stochastic Digital Backpropagation

Irukulapati

Wymeersch

Johannisson

et al. 2014

IEEE Trans. Commun.

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“…On the other hand, for 100% inline dispersion compensation map (zero residual dispersion per span), we see that for PM-4QAM transmissions the performance may only be slightly improved even after extending the back-propagation calculation to full bandwidth (nine channels), and the BER is always worse than 5x10 -2 , regardless of the number of channels included in back-propagation. We attribute this effect to the irreversible incorporation of ASE into the signal by strongly quasi phase matched signal-ASE nonlinearities, where the origin of such effects could either be XPM [36] or FWM [37]. On the contrary, for the PM-16QAM system using 100% inline dispersion compensation map, we observe that the overall system performance is strongly dependent on the number of neighbouring channels back-propagated and a BER improvement of ~1.5 decades is observed for MC-BP in contrast to SC-BP.…”

Section: Resultsmentioning

confidence: 99%

Compensation of Nonlinear Fibre Impairments in Coherent Systems Employing Spectrally Efficient Modulation Formats

Rafique

Zhao

Ellis

2011

IEICE Trans. Commun.

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SUMMARYWe investigate electronic mitigation of linear and nonlinear fibre impairments and compare various digital signal processing techniques, including electronic dispersion compensation (EDC), single-channel back-propagation (SC-BP) and backpropagation with multiple channel processing (MC-BP) in a ninechannel 112 Gb/s PM-mQAM (m=4,16) WDM system, for reaches up to 6,320 km. We show that, for a sufficiently high local dispersion, SC-BP is sufficient to provide a significant performance enhancement when compared to EDC, and is adequate to achieve BER below FEC threshold. For these conditions we report that a sampling rate of two samples per symbol is sufficient for practical SC-BP, without significant penalties.

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“…Thus, each signal will have different performance which must be taken into account in designing and operating newly upgraded systems. The interaction of dispersion and non-linearity in optical fiber is investigated for optical communication systems with independent 10G or 40G modulated signals and for a single MUX/DEMUX bandwidth [15]- [18]. The interaction for hybrid communication system is not published -to the best of our knowledge-and cannot be foreseen.…”

Section: Introductionmentioning

confidence: 99%