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Compensation of Frequency Offset for Differentially Encoded 16- and 64-QAM in the Presence of Laser Phase Noise

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3 Author(s)
Irshaad Fatadin ; Photonics Team, National Physical Laboratory, Middlesex, UK ; David Ives ; Seb J. Savory

The compensation of frequency offset for differentially encoded 16- and 64-ary quadrature amplitude modulation (QAM) in the presence of laser phase noise is investigated. Differential encoding is employed to solve the four-fold phase ambiguity problem in a nondata-aided transmission system with square QAM constellations. Simulation results show that frequency offset and phase noise can successfully be compensated using a second-order digital filter loop for the square QAM constellations.

Published in:

IEEE Photonics Technology Letters  (Volume:22 ,  Issue: 3 )