Patent ID: 7310363

Claim:
An apparatus comprising: a semiconductor heterostructure; an optically isolated tunable laser fabricated in semiconductor heterostructure, said tunable laser having an output; an interferometer having an input coupled to said output of said tunable laser, said interferometer monolithically fabricated with said tunable laser in said semiconductor heterostructure; where an input signal, λ i , is coupled thereto and further comprising: a distributed feedback laser having an output to modulate said input signal, λ i ; a semiconductor optical amplifier having an output and an input coupled to said input signal, λ i , and to said output of said distributed feedback laser; a notch filter having an output and an input coupled to said output of said semiconductor optical amplifier; an output of said interferometer; an input of said interferometer coupled to said output of said notch filter; so that said input signal, λ i , is converted to a desired wavelength via cross phase modulation.