Phase noise tolerance study in coherent optical circular QAM transmissions with Viterbi- Viterbi carrier phase estimation

Sebastian Ortega Zafra, Xiaodan Pang, Gunnar Jacobsen, Sergei Popov, Sergey Sergeyev

Research output: Contribution to journalArticlepeer-review

Abstract

We present a performance evaluation of a non-conventional approach to implement phase noise tolerant optical systems with multilevel modulation formats. The performance of normalized Viterbi-Viterbi carrier phase estimation (V-V CPE) is investigated in detail for circular m-level quadrature amplitude modulation (C-mQAM) signals. The intrinsic property of C-mQAM constellation points with a uniform phase separation allows a straightforward employment of V-V CPE without the need to adapt constellation. Compared with conventional feed-forward CPE for square QAM signals, the simulated results show an enhanced tolerance of linewidth symbol duration product (ΔvTs) at a low sensitivity penalty by using feed-forward CPE structure with C-mQAM. This scheme can be easily upgraded to higher order modulations without inducing considerable complexity.

Original languageEnglish
Pages (from-to)30579-30585
Number of pages7
JournalOptics Express
Volume22
Issue number25
DOIs
Publication statusPublished - 1 Dec 2014

Bibliographical note

Funding: FP7-PEOPLE-2012-IAPP (project GRIFFON, No. 324391)

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