Patent ID: 7440642
Filing Date: 2008-10-21
Classification: G02F

Abstract:
1. An integrated optical modulator comprising an input optical waveguide part for inputting light to the integrated optical modulator, an output optical waveguide part for outputting modulated light from the integrated optical modulator, a double sideband suppressed carrier modulator for modulating light according to a first frequency signal, and a single sideband modulator for modulating light outputted from the double sideband suppressed carrier modulator according to a second frequency signal, wherein the double sideband suppressed carrier modulator comprises: a substrate having cyclically polarization reversed sections; a first optical waveguide part disposed on the substrate, the first optical waveguide part being connected to the input optical waveguide part and comprising a first waveguide, a second waveguide, a first divergence part in which the first waveguide and the second waveguide diverge from the input optical waveguide part, and a first combination part in which the first waveguide and the second waveguide combine and the first optical waveguide part is connected in series to the single sideband modulator; a first electrode part formed over the first and second waveguides near the first divergence part and applying the first frequency signal; and a second electrode part formed over the first and second waveguides near the first combination part, wherein the substrate has different polarization directions in areas adjacent to the first waveguide and the second waveguide.