Patent ID: 7447439

Claim:
An optical component comprising: a substrate; a laser for providing light at a characteristic wavelength corresponding to a laser wavelength range, the laser having a first laser port and a second laser port, the second laser port for emitting a main optical signal in the wavelength range,and for receiving first and second external optical signals having wavelengths corresponding to first and second predetermined wavelength ranges being other than of the laser wavelength range; a first photodetector disposed on said substrate and optically coupled to the laser, said first photodetector for providing data in response to an intensity of a feedback optical-signal provided by the laser; a wavelength dispersive concave, reflective diffraction grating filter having first and second output ports and an input port, the filter for receiving light at said input port comprising the first and second external optical signals from the first laser port, and for dispersing said first and second external optical signals at different angles parallel to the substrate in dependence upon wavelength, said filter for providing light corresponding to the first and second predetermined wavelength ranges at the first and second output ports, respectively; a second photodetector disposed on said substrate and optically coupled to the first output port, said second photodetector for providing a data output signal in response to an intensity of light incident thereon; and a third photodetector disposed on said substrate and optically coupled to the second output port, said third photodetector for providing a data output signal in response to an intensity of light of the second external optical signal incident thereon.