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Carrier Phase Recovery Algorithms for Coherent Optical Circular mQAM Systems
RISE - Research Institutes of Sweden, ICT, Acreo.ORCID iD: 0000-0001-5730-9656
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, ICT, Acreo.
RISE - Research Institutes of Sweden, ICT, Acreo.ORCID iD: 0000-0001-9839-7488
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2016 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 34, no 11, p. 2717-2723Article in journal (Refereed) Published
Abstract [en]

The phase noise tolerance of circular multilevel quadrature amplitude modulation (C-mQAM) constellations employing different carrier phase recovery (CPR) algorithms is studied. A differential decoding scheme and a bit mapping for this type of constellations are proposed. A novel CPR scheme for C-mQAM constellations is also presented. The particular distribution of the constellation points in a C-mQAM signal is exploited to reduce the required Nth power for the removal of the modulation component by a factor of two. Hence, the computational complexity of the proposed algorithm is drastically reduced. The combined linewidth symbol duration product (??Ts) tolerance of different CPR algorithms for C-mQAM constellations is studied and compared with the proposed CPR scheme. The results are analyzed at 3.8e-3 and 1e-2 bit error rate forward error correction limits. The proposed CPR scheme achieves similar ??Ts tolerance compared to single stage BPS algorithm while its computational complexity is reduced by group factors of 27.2 | 32.3, and 30.5 | 32.6 (in the form of multipliers | adders) for C-16QAM and C-64QAM, respectively.

Place, publisher, year, edition, pages
2016. Vol. 34, no 11, p. 2717-2723
Keywords [en]
Carrier phase recovery, Circular quadrature amplitude modulation (C-mQAM), Coherent detection, Differential decoding, Phase noise
National Category
Communication Systems Signal Processing Telecommunications
Identifiers
URN: urn:nbn:se:ri:diva-29871DOI: 10.1109/JLT.2016.2545339OAI: oai:DiVA.org:ri-29871DiVA, id: diva2:1108498
Available from: 2017-06-12 Created: 2017-06-12 Last updated: 2019-06-12Bibliographically approved

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Navarro, Jaime RodrigoOzolins, Oskars

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