Phase noise tolerance study in coherent optical circular QAM transmissions with Viterbi-Viterbi carrier phase estimation
2014 (English)In: Optics Express, ISSN 1094-4087, Vol. 22, no 25, 30579-30585 p.Article in journal (Refereed) Published
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.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-160067DOI: 10.1364/OE.22.030579ISI: 000346368800049ScopusID: 2-s2.0-84919625989OAI: oai:DiVA.org:kth-160067DiVA: diva2:791306
FunderEU, FP7, Seventh Framework Programme, 324391