Patent ID: 7539365

Claim:
A photonic integrated circuit comprising: a chip; a plurality of lasers provided on the chip; a plurality of electro-optic modulators provided on the chip; an optical combiner provided on the chip, the optical combiner having a plurality of inputs and an output, each of the plurality of inputs being coupled to a corresponding one of the plurality of electro-optic modulators; and a plurality of electro-optic amplitude varying elements provided on the chip, each of the plurality of electro-optic amplitude varying elements being provided between corresponding ones of the plurality of lasers and the plurality of electro-optic modulators, wherein each of the plurality of electro-optic amplitude varying elements supplies a corresponding one of a plurality of optical signals to a respective one of the plurality of electro-optic modulators, and a bias voltage is applied to each of the plurality of electro-optic amplitude varying elements to vary a power level of each of the plurality of optical signals.