Optical dispersion compensation in the electrical domain in an optical communications system

摘要

Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic dispersion. The communications signal is then modulated in the electrical domain using the compensation function. In preferred embodiments, compensation is implemented in the transmitter, using a look-up-table and digital-to-analog converter to generate an electrical predistorted signal. The electrical predistorted signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system.

主权项

1. A method of compensating dispersion of a communications signal conveyed through an optical communications system, the method comprising steps of:
deriving a compensation function that substantially mitigates the dispersion imparted to the communications signal by the optical communications system; digitally processing an electrical input signal using the compensation function to generate a predistorted electrical signal comprising a pair of orthogonal signal components; and independently modulating a phase of an optical signal using a first one of the pair of orthogonal signal components of the predistorted electrical signal and an amplitude of the optical signal using a second one of the pair of orthogonal signal components of the predistorted electrical signal to generate a corresponding predistorted optical signal for tansmission through the optical communications system.