How to Increase the Achievable Information Rate by Per-Channel Dispersion Compensation
Journal article, 2019

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.

XPM mitigation

Achievable information rate

per-channel dispersion compensation

fiber Bragg grating

optical communication


Kamran Keykhosravi

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Marco Secondini

Sant'Anna School of Advanced Studies (SSSUP)

Giuseppe Durisi

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Erik Agrell

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Journal of Lightwave Technology

0733-8724 (ISSN)

Vol. 37 10 2443-2451 18617150

Signal shaping in optical communications—Beyond the Gaussian channel

Swedish Research Council (VR) (2017-03702), 2018-01-01 -- 2021-12-31.

Optical Fiber Interference is Not Noise

Swedish Research Council (VR) (2013-5271), 2014-01-01 -- 2017-12-31.

Areas of Advance

Information and Communication Technology

Subject Categories


Atom and Molecular Physics and Optics

Condensed Matter Physics


C3SE (Chalmers Centre for Computational Science and Engineering)



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