NONLINEARITY CANCELLATION IN FIBER OPTIC TRANSMISSION BASED ON FREQUENCY-MUTUALLY-REFERENCED CARRIERS

摘要

A system and method for mitigating nonlinearity in an optical communication link with multiple carriers uses mutual frequency referencing to stabilize at least a portion of the multiple carriers. Using at least one frequency-referenced signal, carrier nonlinearity can be determined and compensated within the link by pre-distortion, back-propagation, or a combination of both. Mutual frequency referencing may be performed at the emitting end of the link, at the receiving end, or a combination of both.

主权项

1. A method for mitigating nonlinearity in an optical communication link comprising multiple carriers, the method comprising:
applying mutual frequency referencing to at least a portion of the multiple carriers by one or more of frequency locking free running lasers, generating the multiple carriers using a frequency comb, and generating the multiple carriers using stabilized independent lasers; using at least one frequency-referenced carrier, determining nonlinearity within the link; and compensating for the determined nonlinearity, wherein compensating comprises canceling the nonlinearity by one or more of applying a pre-distortion to the carriers, applying back propagation, using a nonlinear equalizer, generating a feedback correction signal with a frequency-locked local oscillator, and applying calculated phase conjugation of a received signal.