Pilot Distributions for Joint-Channel Carrier-Phase Estimation in Multichannel Optical Communications
Journal article, 2020

Joint-channel carrier-phase estimation can improve the performance of multichannel optical communication systems. In the case of pilot-aided estimation, the pilots are distributed over a two-dimensional channel-time symbol block that is transmitted through multiple channels. However, suboptimal pilot distributions reduce the effectiveness of the carrier-phase estimation and thus result in unnecessary pilot overhead, which reduces the overall information rate of the system. It is shown that placing pilots identically in all channels is suboptimal in general. By instead optimizing the pilot distribution, the mean squared error of the phase-noise estimates can be decreased by over 90% in some cases. Moreover, it is shown that the achievable information rate can be increased by up to 0.05, 0.16, and 0.41 bits per complex symbol for dual-polarization 20 GBd transmission of 64-ary, 256-ary, and 1024-ary quadrature amplitude modulation over 20 four-dimensional channels, respectively, assuming a total laser linewidth of 200 kHz.

signal processing

multichannel transmission

optimization

pilot

wavelength-division multiplexing

fiber-optic communications

space-division multiplexing

Frequency combs

phase noise

Kalman filtering

Author

Arni Alfredsson

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Erik Agrell

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Magnus Karlsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Henk Wymeersch

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Journal of Lightwave Technology

0733-8724 (ISSN)

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Knut and Alice Wallenberg Foundation, 2019-07-01 -- 2024-06-30.

Technologies for spatial-division multiplexing: The next frontier in optical communications

Swedish Research Council (VR), 2015-01-01 -- 2018-12-31.

Multi-dimensional Signal Processing with Frequency Comb Transceivers

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

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1109/JLT.2020.2995476

More information

Created

5/20/2020