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Adaptive Boundaries Scheme for Cycle-Slip Mitigation in C-mQAM Coherent Systems
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO. Acreo Swedish, Sweden.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0001-8389-158X
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2015 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 27, no 20, 2154-2157 p.Article in journal (Refereed) Published
Abstract [en]

We propose a method for cycle-slip mitigation in circular multilevel quadrature amplitude modulation (C-mQAM) coherent optical systems, with constellation rotational asymmetry, based on an adaptive boundaries approach. The impact of cycle-slips in C-mQAM coming from Viterbi-Viterbi algorithm limits the phase noise tolerance. By introducing adaptive boundaries and a differential coding scheme, the ambiguity of asymmetrical rotation of constellation can be effectively removed. Performance of the proposed method is evaluated for a C-16QAM and C-64QAM for various laser linewidths. Results show a noticeable improvement in linewidth symbol duration product (Delta(upsilon) . T-S) tolerance compared with the previous studies on C-mQAM and mQAM constellations. The Delta(upsilon) . T-S tolerance reaches 4 x 10(-4) and 1.1 x 10(-4) for C-16QAM and C-64QAM, respectively, for 1 dB penalty at a symbol error rate of 10(-3).

Place, publisher, year, edition, pages
[Navarro, Jaime Rodrigo; Pang, Xiaodan; Ozolins, Oskars; Jacobsen, Gunnar] Acreo Swedish ICT AB, Network & Transmiss Lab, S-16425 Kista, Sweden. [Navarro, Jaime Rodrigo] Royal Inst Technol, S-11428 Stockholm, Sweden. [Kakkar, Aditya; Schatz, Richard; Popov, Sergei] Royal Inst Technol, Opt & Photon Div, S-11428 Stockholm, Sweden., 2015. Vol. 27, no 20, 2154-2157 p.
Keyword [en]
Carrier phase estimation, circular quadrature amplitude modulation, coherent optical communications, differential decoding
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URN: urn:nbn:se:kth:diva-175483DOI: 10.1109/LPT.2015.2455234ISI: 000361685200012ScopusID: 2-s2.0-84959330772OAI: diva2:865404

QC 20151028

Available from: 2015-10-28 Created: 2015-10-16 Last updated: 2015-10-28Bibliographically approved

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Rodrigo Navarro, JaimeKakkar, AdityaSchatz, RichardPopov, Sergei
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