Compensation of Laser Frequency Fluctuations and Phase Noise in 16-QAM Coherent Receivers

PABLO GIANNI; GRACIELA CORRAL BRIONES; CARMEN RODRÍGUEZ; MARIO R. HUEDA

IEEE PHOTONICS TECHNOLOGY LETTERS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2013 vol. 25 p. 442 - 445

1041-1135

Frequency fluctuations caused by mechanical vibrations, power supply noise, and other mechanisms are detrimental to the phase estimator performance in high speed intradyne coherent optical receivers. In this work we propose the use of a low-latency parallel digital phase lock loop in combination with common feed-forward carrier phase recovery algorithms in order to compensate both the phase noise and laser frequency fluctuation effects on 16-quadrature amplitude modulation (QAM) receivers. Numerical results demonstrate the excellent behavior of the proposed two-stage carrier recovery scheme.