Patent ID: 7426350
Filing Date: 2008-09-16
Classification: H04B

Abstract:
1. A system comprising: an optical transmitter to produce an optical signal in response to a control signal that is modulated to carry information; an electrical pre-distortion circuit, coupled in an electrical path of said control signal prior to reception by said optical transmitter, to superimpose an electrical pre-distortion signal to said control signal that reduces nonlinear distortions in said optical signal; an optical device disposed in an optical path of said optical signal and configured to produce a wavelength-dependent optical transfer profile on said optical signal to reduce residual nonlinear distortions in said optical signal and to produce a linearized optical signal; an optical coupler disposed in said optical path to split a fraction of said linearized optical signal to produce an optical monitor signal; an optical detector coupled to receive said optical monitor signal to produce a detector output; a distortion circuit coupled to said optical detector to receive said detector output, said distortion circuit to measure nonlinear distortions in said linearized optical signal and to produce a distortion control signal to control at least one of said optical transmitter and said optical device to further reduce nonlinear distortions in said linearized optical signal; and a wavelength control unit coupled to said optical transmitter that controls a wavelength of said optical signal, wherein said distortion control signal is coupled into said wavelength control unit to adjust said wavelength of said optical signal.