Patent ID: 8363685

Claim:
A wavelength tunable external cavity laser beam generating device comprising: a first substrate; a second substrate adjacent to the first substrate; an optical amplifier on the first substrate; an optical signal processor on the first substrate; an external wavelength tunable reflector disposed on the second substrate and connected to the optical amplifier; and a comb reflector on the first substrate, wherein the comb reflector includes a comb waveguide disposed on the first substrate; a first diffraction grating disposed at one end of the comb waveguide adjacent to the optical amplifier; and a second diffraction grating disposed at another end of the comb waveguide adjacent to the optical signal processor, wherein the optical amplifier, the comb reflector, and the optical signal processor are connected in series in the stated order on the first substrate such that the first diffraction grating and the second diffraction grating are both disposed between the optical amplifier and the optical signal processor, and wherein the optical amplifier, the comb reflector and the optical signal processor constitute a continuous waveguide.