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Adaptive Boundaries Scheme for Cycle-Slip Mitigation in C-mQAM Coherent Systems
RISE., Swedish ICT, Acreo.ORCID-id: 0000-0001-5730-9656
RISE., Swedish ICT, Acreo.ORCID-id: 0000-0003-4906-1704
KTH Royal Institute of Technology, Sweden.
RISE., Swedish ICT, Acreo.ORCID-id: 0000-0001-9839-7488
Vise andre og tillknytning
2015 (engelsk)Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 27, nr 20, s. 2154-2157Artikkel i tidsskrift (Fagfellevurdert) 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 (Δν · TS) tolerance compared with the previous studies on C-mQAM and mQAM constellations. The Δν · TS tolerance reaches 4 × 10 -4 and 1.1 × 10 -4 for C-16QAM and C-64QAM, respectively, for 1 dB penalty at a symbol error rate of 10 -3.

sted, utgiver, år, opplag, sider
2015. Vol. 27, nr 20, s. 2154-2157
Emneord [en]
Carrier phase estimation, circular quadrature amplitude modulation, coherent optical communications, differential decoding
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-31902DOI: 10.1109/LPT.2015.2455234Scopus ID: 2-s2.0-84959330772OAI: oai:DiVA.org:ri-31902DiVA, id: diva2:1151760
Tilgjengelig fra: 2017-10-24 Laget: 2017-10-24 Sist oppdatert: 2024-03-11bibliografisk kontrollert

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