How to Increase the Achievable Information Rate by Per-Channel Dispersion Compensation
TLDR
In this paper, the authors show that per-channel dispersion compensation increases the frequency correlation of the distortions induced by XPM over the channel bandwidth, making them more similar to a conventional phase noise.Abstract:
Deploying periodic inline chromatic dispersion compensation enables reducing the complexity of the digital back propagation (DBP) algorithm. However, compared with nondispersion-managed (NDM) links, dispersion-managed (DM) ones suffer a stronger cross-phase modulation (XPM). Utilizing per-channel dispersion-managed (CDM) links (e.g., using fiber Bragg grating) allows for a complexity reduction of DBP, while abating XPM compared to DM links. In this paper, we show for the first time that CDM links enable also a more effective XPM compensation compared to NDM ones, allowing a higher achievable information rate (AIR). This is explained by resorting to the frequency-resolved logarithmic perturbation model and showing that per-channel dispersion compensation increases the frequency correlation of the distortions induced by XPM over the channel bandwidth, making them more similar to a conventional phase noise. We compare the performance (in terms of the AIR) of a DM, an NDM, and a CDM link, considering two types of mismatched receivers: one neglects the XPM phase distortion and the other compensates for it. With the former, the CDM link is inferior to the NDM one due to an increased in-band signal–noise interaction. However, with the latter, a higher AIR is obtained with the CDM link than with the NDM one owing to a higher XPM frequency correlation. The DM link has the lowest AIR for both receivers because of a stronger XPM.read more
Citations
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Improved Lower Bounds on Mutual Information Accounting for Nonlinear Signal-Noise Interaction
TL;DR: In this paper, lower bounds on mutual information were computed using an auxiliary backward channel, which has not been previously considered in the context of fiber-optic communications, which can be explained by the ability of SDBP to account for nonlinear signal-noise interactions.
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Four-dimensional polarization-ring-switching for dispersion-managed optical fibre systems
TL;DR: The recently introduced 4D 64-ary polarisation-ring-switching format is investigated in dispersion-managed systems and numerical simulations show a reach increase of $25\%$ with respect to PM-8QAM.
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