Comparing Inter-Core Skew Fluctuations in Multi-Core and Single-Core Fibers

Luís, Ruben S.; Puttnam, Benjamin J.; Mendinueta, José Manuel Delgado; Klaus, Werner; Awaji, Yoshinari; Wada, Naoya

doi:10.1364/cleo_si.2015.sm2l.5

Cited by 26 publications

(18 citation statements)

References 3 publications

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“…Moreover, the adaptive equalization is assumed to have been carried out using a phase-immune equalizer, such as a radially-directed equalizer (RDE) [27]. As already mentioned, the phase noise can be highly correlated, albeit not identical, across the cores and polarizations in an MCF system where all cores share the light-source and LO lasers [2], [18]. In the absence of a model that accurately describes the phase-noise statistics across all channels, we resort to a simplified model in which the phase noise comprises multiple components.…”

Section: Introductionmentioning

confidence: 99%

Pilot-Aided Joint-Channel Carrier-Phase Estimation in Space-Division Multiplexed Multicore Fiber Transmission

Alfredsson

Agrell

Wymeersch

et al. 2019

J. Lightwave Technol.

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The performance of pilot-aided joint-channel carrier-phase estimation (CPE) in space-division multiplexed multicore fiber (MCF) transmission with correlated phase noise is studied. To that end, a system model describing uncoded MCF transmission where the phase noise comprises a common laser phase noise, in addition to core-and polarization-specific phase drifts, is introduced. It is then shown that the system model can be regarded as a special case of a multidimensional randomwalk phase-noise model. A pilot-aided CPE algorithm developed for this model is used to evaluate two strategies, namely jointchannel and per-channel CPE. To quantify the performance differences between the two strategies, their respective phasenoise tolerances are assessed through Monte Carlo simulations of uncoded transmission for different modulation formats, pilot overheads, laser linewidths, numbers of spatial channels, and degrees of phase-noise correlation across the channels. For 20 GBd transmission with 200 kHz combined laser linewidth and 1% pilot overhead, joint-channel CPE yields up to 3.4 dB improvement in power efficiency or 25.5% increased information rate. Moreover, through MCF transmission experiments, the system model is validated and the strategies are compared in terms of bit-error-rate performance versus transmission distance for uncoded transmission of different modulation formats. Up to 21% increase in transmission reach is observed for 1% pilot overhead through the use of joint-channel CPE.

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Section: Introductionmentioning

confidence: 99%

Pilot-Aided Joint-Channel Carrier-Phase Estimation in Space-Division Multiplexed Multicore Fiber Transmission

Alfredsson

Agrell

Wymeersch

et al. 2019

J. Lightwave Technol.

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“…This gives rise to spatial correlation in the phase noise, which can be exploited to relax hardware requirements [11] and reduce receiver complexity [12]. However, the phase noise is not perfectly correlated, as environmental effects and system imperfections introduce phase drifts between cores and polarizations [10], [13]. In addition, correlated phase noise is present in wavelength-division multiplexed (WDM) systems utilizing frequency combs, as the combs enable phase locking between the different frequency lines.…”

Section: Introductionmentioning

confidence: 99%

Iterative Detection and Phase-Noise Compensation for Coded Multichannel Optical Transmission

Alfredsson

Agrell

Wymeersch

2019

IEEE Trans. Commun.

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The problem of phase-noise compensation for correlated phase noise in coded multichannel optical transmission is investigated. To that end, a simple multichannel phase-noise model is considered and the maximum a posteriori detector for this model is approximated using two frameworks, namely factor graphs (FGs) combined with the sum-product algorithm (SPA), and a variational Bayesian (VB) inference method. The resulting pilot-aided algorithms perform iterative phase-noise compensation in cooperation with a decoder, using extended Kalman smoothing to estimate the a posteriori phase-noise distribution jointly for all channels. The system model and the proposed algorithms are verified using experimental data obtained from space-division multiplexed multicore-fiber transmission. Through Monte Carlo simulations, the algorithms are further evaluated in terms of phase-noise tolerance for coded transmission. It is observed that they significantly outperform the conventional approach to phase-noise compensation in the optical literature. Moreover, the FG/SPA framework performs similarly or better than the VB framework in terms of phase-noise tolerance of the resulting algorithms, for a slightly higher computational complexity.

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“…It results from limitations in the fiber fabrication process as well as environmental factors [6] and may be decomposed into a static component and a random time varying component [17]. It has been shown that static ICS is generally small enough to be compensated using periodically positioned static optical delay lines, even though such an effort may prove to be unfeasible for complex networks.…”

Section: Analysis Of the Inter-core Skewmentioning

confidence: 99%

“…For this purpose, we used an experimental setup similar to that in reference [17]. We transmitted time-aligned packets on the relevant MCF cores using the pSSC transmitter setup shown in Figure 4a.…”

Section: Analysis Of the Inter-core Skewmentioning

confidence: 99%

Demonstration of an SDM Network Testbed for Joint Spatial Circuit and Packet Switching †

et al. 2018

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Abstract:We demonstrate a spatial division multiplexing (SDM) network testbed composed of three nodes connected via 19-core multi-core fibers. Each node is capable of joint spatial circuit switching and joint packet switching to support 10 Tb/s spatial circuit super channels and 1 Tb/s line rate spatial packet super channels. The performance of the proposed hybrid network is evaluated, showing successful co-existence of both systems in the same network to provide high capacity and high granularity services. Finally, we demonstrate an optical channel selection associated with the quality of service requirements on the SDM network testbed.

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Comparing Inter-Core Skew Fluctuations in Multi-Core and Single-Core Fibers

Cited by 26 publications

References 3 publications

Pilot-Aided Joint-Channel Carrier-Phase Estimation in Space-Division Multiplexed Multicore Fiber Transmission

Pilot-Aided Joint-Channel Carrier-Phase Estimation in Space-Division Multiplexed Multicore Fiber Transmission

Iterative Detection and Phase-Noise Compensation for Coded Multichannel Optical Transmission

Demonstration of an SDM Network Testbed for Joint Spatial Circuit and Packet Switching †

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