Patent ID: 8260150

Claim:
An optical transmitter comprising; a laser array comprising a plurality of frequency modulated lasers each tuned to a corresponding wavelength of a plurality of wavelengths; a planar lightwave chip (PLC) abutting the laser array, the PLC comprising: a plurality of optical spectrum reshapers (OSRs), each having a transmission edge and each positioned to receive light from one of the plurality of frequency modulated lasers having a corresponding frequency thereof located nearest the transmission edge relative to other frequency modulated lasers of the laser array, wherein each of the plurality of OSRs is adapted to receive input light and to output a transmitted portion and a rejected portion of the input light; and an optical multiplexer optically coupled to each of the plurality of OSRs and having an output proximate a first edge of the PLC, the optical multiplexer having transmission peaks each aligned with the corresponding frequency of one of the plurality of frequency modulated lasers of the laser array; a first plurality of waveguides each having a first end positioned to receive a portion of the transmitted light from one of the plurality of OSRs and having a second end positioned proximate a second edge of the PLC; a first array of photodetectors positioned proximate the second ends of the plurality of waveguides; and a second plurality of waveguides each having a first end positioned to receive a portion of the rejected light and a second end positioned proximate a third edge of the PLC; a second array of photodetectors positioned proximate the second ends of the plurality of waveguides; a plurality of index of refraction adjusting elements each coupled to one of the plurality of OSRs; and a controller coupled to the plurality of index of refraction adjusting elements, the first array of photodetectors, and the second array of photodetectors, the controller configured to adjust inputs to the plurality of index of refraction adjusting elements according to outputs from the first and second arrays of photodetectors.