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

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4 Author(s)
Syed Muhammad Bilal ; Dipt. di Elettron. e Telecomun., Politec. di Torino, Torino, Italy ; Andrea Carena ; Chris Fludger ; Gabriella Bosco

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.

Published in:

IEEE Photonics Technology Letters  (Volume:26 ,  Issue: 3 )