Abstract

We propose and demonstrate an all-optical phase noise reduction scheme that uses optical nonlinear mixing and tunable optical delays to suppress the low-speed phase noise induced by laser linewidth. By utilizing the phase conjugate copy of the original signal and two narrow-linewidth optical pumps, the phase noise induced by laser linewidth can be reduced by a factor of 5 for a laser with 500-MHz phase noise bandwidth. The error-vector-magnitude can be improved from 30% to 14% for the same laser linewidth for 40-Gbit/s quadrature phase shift keying signal.

© 2014 Optical Society of America

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