Constellation optimization for coherent optical channels distorted by nonlinear phase noise

C. Hager, A. Graell I Amat, A. Alvarado, E. Agrell

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

7 Citations (Scopus)

Abstract

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 Kerreffect. 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.
Original languageEnglish
Title of host publicationIEEE Global Communications Conference (GLOBECOM) 2012
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages2870-2875
ISBN (Electronic)978-1-4673-0921-9
ISBN (Print)978-1-4673-0920-2
DOIs
Publication statusPublished - Dec 2012
Event2012 IEEE Global Communications Conference (GLOBECOM 2012) - Anaheim, CA, USA
Duration: 3 Dec 20127 Dec 2012

Conference

Conference2012 IEEE Global Communications Conference (GLOBECOM 2012)
Abbreviated titleGLOBECOM 2012
Period3/12/127/12/12

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  • Cite this

    Hager, C., Graell I Amat, A., Alvarado, A., & Agrell, E. (2012). Constellation optimization for coherent optical channels distorted by nonlinear phase noise. In IEEE Global Communications Conference (GLOBECOM) 2012 (pp. 2870-2875). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/GLOCOM.2012.6503552