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

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 squa...

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Bibliographic Details
Published in:IEEE photonics technology letters 2010-02, Vol.22 (3), p.176-178
Main Authors: Fatadin, I., Ives, D., Savory, S.J.
Format: Article
Language:English
Subjects:
Compensation
Conferences
Constellations
Differential encoding (DE)
Digital filters
Encoding
Fiber optics
Frequency
frequency offset
Laser noise
Lasers
Maximum likelihood decoding
Noise
Offsets
Optical fibers
Phase locked loops
Phase noise
phase recovery
Phase shift keying
Quadrature amplitude modulation
quadrature amplitude modulation (QAM)
Tracking loops
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2009.2037329