Patent ID: 8718486

Claim:
A monolithically integrated optical transmitter comprising: at least one monocrystalline substrate; a tunable laser resonator monolithically integrated with the substrate; a first and a second modulator monolithically integrated with the substrate, the first and second modulators configured to modulate intensity and phase of an input optical signal and produce a modulated optical signal; a polarization rotator monolithically integrated with the substrate; and an optical combiner monolithically integrated with the substrate and configured to combine optical signals output from the first and second modulators, the optical combiner including a first input waveguide connected to the first modulator, a second input waveguide connected to the second modulator and at least one turning mirror disposed with respect to the first or second input waveguides, the polarization rotator disposed in the optical path between the first or second modulator and the optical combiner, the modulated optical signal from the first or second modulator being coupled into the polarization rotator.