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Photonics 2016, 3(2), 37; doi:10.3390/photonics3020037

Two-Stage n-PSK Partitioning Carrier Phase Recovery Scheme for Circular mQAM Coherent Optical Systems

1
Network and Transmission Laboratory, Acreo Swedish ICT AB, Stockholm 164 40, Sweden
2
Royal Institute of Technology (KTH), Stockholm 164 40, Sweden
3
DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, DK 2800, Kgs. Lyngby, Denmark
*
Author to whom correspondence should be addressed.
Received: 25 April 2016 / Revised: 31 May 2016 / Accepted: 1 June 2016 / Published: 4 June 2016
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Abstract

A novel two-stage n-PSK partitioning carrier phase recovery (CPR) scheme for circular multilevel quadrature amplitude modulation (C-mQAM) constellations is presented. The first stage of the algorithm provides an initial rough estimation of the received constellation, which is utilized in the second stage for CPR. The performance of the proposed algorithm is studied through extensive simulations at the forward error correction bit error rate targets of 3.8 × 103 and 1 × 102 and is compared with different CPR algorithms. A significant improvement in the combined linewidth symbol duration product (ΔνTs) tolerance is achieved compared to the single-stage n-PSK partitioning scheme. Superior performance in the ΔνTs tolerance compared to the blind phase search algorithm is also reported. The relative improvements with respect to other CPR schemes are also validated experimentally for a 28-Gbaud C-16QAM back-to-back transmission system. The computational complexity of the proposed CPR scheme is studied, and reduction factors of 24.5 | 30.1 and 59.1 | 63.3 are achieved for C-16QAM and C-64QAM, respectively, compared to single-stage BPS in the form of multipliers | adders. View Full-Text
Keywords: carrier phase recovery (CPR); circular quadrature amplitude modulation (C-mQAM); coherent detection; phase noise carrier phase recovery (CPR); circular quadrature amplitude modulation (C-mQAM); coherent detection; phase noise
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rodrigo Navarro, J.; Kakkar, A.; Pang, X.; Iglesias Olmedo, M.; Ozolins, O.; Da Ros, F.; Piels, M.; Schatz, R.; Zibar, D.; Jacobsen, G.; Popov, S. Two-Stage n-PSK Partitioning Carrier Phase Recovery Scheme for Circular mQAM Coherent Optical Systems. Photonics 2016, 3, 37.

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