On the Performance of Joint-Core Carrier-Phase Estimation in the Presence of Intercore Skew
Journal article, 2019

The sharing of lasers in space-division multiplexed multicore-fiber transmission yields correlated phase noise across the spatial channels. As a result, system performance can be improved through the use of joint-core carrier-phase estimation (CPE). However, the presence of intercore skew can reduce the potential of such schemes. This paper studies the effects of skew on pilot-aided joint-core CPE, where via simulations, it is shown that joint-core processing can be made to perform similarly to or better than separate-core processing for any amount of skew. It is shown that for a given signal-to-noise ratio (SNR) and skew, the performance of joint-core CPE relative to separate-core CPE is highly dependent on the ratio of the light-source linewidth to the local oscillator (LO) linewidth. In general, the performance of joint-core CPE in the presence of skew improves as the LO linewidth decreases compared to the light-source laser linewidth, assuming that the spatial channels are digitally realigned at the receiver.

multicore fiber

skew

carrier-phase estimation

space-division multiplexing

coherent communication

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)

Unlocking the Full-dimensional Fiber Capacity

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

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1109/JLT.2019.2931987

More information

Latest update

8/13/2019