Patent ID: 7519246

Claim:
A photonic integrated circuit chip comprising: a substrate; a plurality of optical sources provided on the substrate, each of the plurality of optical sources providing a corresponding one of a plurality of modulated first optical signals, each of the plurality of modulated first optical signals having a corresponding one of a plurality of wavelengths; an optical combiner provided on the substrate, the optical combiner having a first side including a plurality of inputs and a plurality of outputs and a second side including an input and an output, each of the plurality of inputs of the first side of the optical combiner configured to receive a corresponding one of the plurality of modulated first optical signals, the optical combiner configured to combine the plurality of modulated first optical signals and supply a first WDM channel signal at the output of the second side of the optical combiner, the input of the second side of the optical combiner configured to receive a second WDM signal, the optical combiner configured to decombine the second WDM signal into a plurality of second optical signals; and a plurality of photodetectors provided on the substrate, each of the plurality of photodetectors configured to receive a respective one of the plurality of second optical signals and generate a corresponding one of a plurality of electrical signal.