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Digital PLL Based Frequency Offset Compensation and Carrier Phase Estimation for 16-QAM Coherent Optical Communication Systems

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We modify a 2nd-order digital phase-locked loop (PLL) with additional frequency-offset compensation and pilot-symbol aided cycle slip recovery modules, and show that the modified 2nd-order PLL can successfully recover the carrier phase for a 16-QAM coherent detection system with a frequency offset up to 10% of the symbol rate.

© 2012 Optical Society of America

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