Patent ID: 7773837

Claim:
An optical device, comprising: a substrate having a cleavage plane; a plurality of optical sources provided on the substrate, each of the plurality of optical sources supplying a corresponding one of a plurality of optical signals, each of the plurality of optical signals having a corresponding one of a plurality of wavelengths; a plurality of heaters, each of which being thermally coupled to a corresponding one of the plurality of optical sources; an optical combiner provided on the substrate˜ the optical combiner having a plurality of inputs, each of which being configured to receive a corresponding one of the plurality of optical signals, and an output, the output supplying a wavelength division multiplexed (WDM) signal including each of the plurality of optical signals; and circuitry configured to supply a corresponding one of a plurality of currents to each of the plurality of heaters, each of the plurality of heaters being configured to adjust a corresponding one of the plurality of wavelengths in response to said corresponding one of the plurality of currents, the circuitry supplying the plurality of currents in response to at least a portion of the WDM signal; wherein the output of the optical combiner includes a waveguide, the waveguide having an edge portion, the edge portion being tilted relative to the cleavage plane of the substrate, such that an angle is formed between the edge portion and the cleavage plane.