Dual Stage CPE for 64-QAM Optical Systems Based on a Modified QPSK-Partitioning Algorithm

Author

Bilal, Syed Muhammad ; Carena, Andrea ; Fludger, C. ; Bosco, Gabriella

Author_Institution

Dipt. di Elettron. e Telecomun., Politec. di Torino, Torino, Italy

Volume

26

Issue

3

fYear

2014

fDate

Feb.1, 2014

Firstpage

267

Lastpage

270

Abstract

In this letter, a novel two-stage digital feed forward carrier recovery algorithm for 64-ary quadrature amplitude modulation (QAM) is proposed and analyzed. Due to the absence of any feedback loop, the approach shows a high tolerance toward laser phase noise. Different steps involving partition, selection, and rotation of symbols are also discussed. For an OSNR penalty of 1 dB at bit error rate of 10^-3, the proposed scheme can tolerate linewidth times symbol duration product equal to 3.3×10^-5 and hence can be used with the commercially available state-of-the-art tunable lasers for 64-QAM transmission at 400 Gb/s.

Keywords

error statistics; maximum likelihood estimation; phase noise; quadrature amplitude modulation; quadrature phase shift keying; 64 QAM optical systems; bit error rate; dual stage CPE; laser phase noise; linewidth times symbol duration product; modified QPSK partitioning algorithm; quadrature amplitude modulation; state of the art tunable lasers; two stage digital feed forward carrier recovery algorithm; Bit error rate; Laser noise; Maximum likelihood estimation; Optical receivers; Phase estimation; Phase noise; Quadrature amplitude modulation; Bit error rate (BER); Viterbi & Viterbi algorithm; carrier phase recovery; linewidth times symbol duration; maximum likelihood estimation (MLE); quadrature amplitude modulation (QAM);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2292553

Filename

6674057