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Compensation of Frequency Offset for 16-QAM Optical Coherent Systems Using QPSK Partitioning

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2 Author(s)
Irshaad Fatadin ; Photonics Team, National Physical Laboratory, Teddington, UK ; Seb J. Savory

The performance of a feed-forward carrier frequency recovery algorithm for 16-quadrature amplitude modulation (QAM) optical coherent systems is investigated using the quaternary phase-shift keying (QPSK) partition scheme. The frequency estimation technique, which employs only a subset of the 16-QAM symbols with the QPSK partition, is demonstrated to be effective when applied prior to the carrier phase recovery. Frequency offset of 10-1 times the symbol rate is shown to be tolerable at a bit-error rate (BER) of 10-3 with combined linewidths symbol duration products of 10-4 .

Published in:

IEEE Photonics Technology Letters  (Volume:23 ,  Issue: 17 )