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Phase noise tolerance study in coherent optical circular QAM transmissions with Viterbi-Viterbi carrier phase estimation
RISE, Swedish ICT, Acreo. KTH, Optik och Fotonik, OFO.
RISE, Swedish ICT, Acreo.
RISE, Swedish ICT, Acreo.
KTH, Optik och Fotonik, OFO.
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2014 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 25, 30579-30585 p.Article in journal (Refereed) Published
Abstract [en]

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 (Delta vT(s)) 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.

Place, publisher, year, edition, pages
2014. Vol. 22, no 25, 30579-30585 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:ri:diva-27974DOI: 10.1364/OE.22.030579OAI: oai:DiVA.org:ri-27974DiVA: diva2:1071005
Funder
EU, FP7, Seventh Framework Programme, 324391]
Available from: 2015-02-27 Created: 2017-02-02 Last updated: 2017-11-29Bibliographically approved

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