Apparatus and method of compensating for compact digital domain chromatic dispersion

摘要

A method and apparatus of compensating for compact digital domain chromatic dispersion. The distortion of an optical signal due to chromatic dispersion is compensated by a digital signal processing in the electrical domain, either prior to the optical transmitter or following the receiver. The circular coefficient approximation and sub-band processing reduce the amount of computations to execute a given level of chromatic dispersion compensation compared to a direct finite impulse response filter implementation.

主权项

1. A digital signal processor utilized in a fiber optic communication system, the digital signal processor comprising:
at least one integrated circuit coupled to at least one memory, the at least one integrated circuit configured to:
compensate for chromatic dispersion of the fiber optic communication by executing a digital filter function,wherein the digital filter function includes an operation of multiplying a signal value received by the digital signal processor by a filter coefficient that is approximated to a circular plot on a complex plane of coefficients to produce a multiplication result that recurs at least three times to be usable at least three different times during the execution of the digital filter function to compensate for the chromatic dispersion.