Patent ID: 7792432

Claim:
An optical transmitter for generating a modulated optical signal for transmission over a fiber optic link to a remote receiver comprising: a laser for producing a baseband optical signal including noise spread over a frequency spectrum; a modulator for modulating the baseband optical signal with a RF signal to produce a modulated information-containing optical signal; a phase modulator coupled to an output of the modulator for receiving the modulated information-containing optical signal, for modifying the modulated information-containing optical signal by reducing phase noise associated with the baseband optical signal, and for producing an output optical signal that is coupled to the fiber optic link; and a phase correction circuit coupled between the laser and the phase modulator, the phase correction circuit including a frequency discriminator having an input coupled to receive a portion of the baseband optical signal and an output coupled to a photodiode to convert the phase noise associated with the baseband optical signal to a modulating electrical signal for controlling the phase modulator to provide feedforward cancellation of the phase noise.