Patent ID: 7751658

Claim:
An optical transmitter, comprising: a photonic integrated circuit including: a plurality of modulated sources, each of which provides a corresponding one of a plurality of modulated optical signals at a respective one of a plurality of wavelengths, the plurality of wavelengths conforming to a modulated source wavelength grid, at least one of the plurality of optical signals including a modulated tone; and an optical combiner having a plurality of inputs, an output and a passband, each of the plurality of modulated optical signals coupled to a corresponding one of the plurality of inputs of the optical combiner, the optical combiner being configured to provide a multiplexed optical signal at the output; and a feedback system coupled to the photonic integrated circuit to tune a wavelength of the at least one of the plurality of optical signals in response to the modulated tone such that the modulated source wavelength grid substantially corresponds to with the passband of the optical combiner.