Patent ID: 7200296

Claim:
A monolithic photonic integrated circuit (PIC) chip comprising: an array of modulated sources formed on the PIC chip and having different emission wavelengths according to a modulated source wavelength grid and providing modulated channel signal outputs; a plurality of first wavelength tuning elements, one associated with each of the modulated sources; an wavelength selective combiner integrated on the PIC chip and having a given optimum wavelength passband response and providing a combined channel signal WDM output; the modulated signal outputs optically coupled to one or more inputs of the wavelength selective multiplexer; a WDM channel signal output from the wavelength selective combiner that is provided to a chip output; the modulated source wavelength tuning elements to tune the emission wavelength of the respective modulated sources to vary the modulated source wavelength grid to approximate or to be chirped to the given optimum wavelength passband of the wavelength selective combiner.