Constellation Optimization for Coherent Optical Channels Distorted by Nonlinear Phase Noise
Paper in proceedings, 2012

We consider the design of amplitude phase-shift keying (APSK) constellations, targeting their application to coherent fiber-optical communications. Phase compensation is used at the receiver to combat nonlinear phase noise caused by the Kerr-effect. We derive the probability density function of the post- compensated observation for multilevel constellations. Optimal APSK constellations in terms of symbol error probability (SEP) are found assuming a two-stage detector. Performance gains of 3.2 dB can be achieved compared to 16-QAM at a SEP of 10^−2. We optimize the number of rings, the number of points per ring, as well as the radius distribution of the constellation. For low to moderate nonlinearities, radius optimization only yields minor improvements over an equidistant spacing of rings. In the highly nonlinear regime, however, a smaller SEP can be achieved by “sacrificing” the outer ring of the constellation, in favor of achieving good SEP in the remaining rings.

nonlinear phase noise

self-phase modulation

optical Kerr-effect

APSK constellation

Author

Christian Häger

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Alexandre Graell i Amat

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Erik Agrell

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Proc. IEEE Global Communications Conference (GLOBECOM) 2012

0277-786X (ISSN)

2870-2875

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Communication Systems

Electrical Engineering, Electronic Engineering, Information Engineering

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1117/12.873320

ISBN

978-081948496-3

More information

Latest update

3/29/2018