Patent ID: 9559780
Date: 2017-01-31
CPC Classifications: H04B

Claim:
1. An optical transmitter comprising a laser to generate an optical output; an optical modulator to modulate the optical output using amplitude modulation (AM) for transmission over a fiber cable; a modulator bias circuit to adjust a bias point of the optical modulator to reduce at least a portion of distortion created in the optical transmitter; a first path to provide an RF input signal, via a pre-distortion circuit, to a first combining circuit for combining an output of the pre-distortion circuit with an output of the modulator bias circuit, such that an output of the first combining circuit is provided as an input to the optical modulator, wherein the optical modulator is to generate the AM based on the RF input signal, and wherein the optical modulator also generates frequency modulation (FM) based on the RF input signal; a modulation source for adding FM to the optical output of the laser to suppress Stimulated Brillouin Backscattering (SBS); and a second signal path to provide the RF input signal to a second combining circuit for combining the RF input signal with an output of the modulation source, such that an output of the second combining circuit is provided as an input to the laser, wherein the laser is to generate FM to counteract the FM of the modulator.