Patent ID: 8472759
Filing Date: 2013-06-25
Classification: G02F

Abstract:
1. An optical device comprising: a substrate having an electro-optical effect; a main waveguide provided on the substrate; a first Mach-Zehnder part having first waveguides provided on the substrate and coupled with the main waveguide, and first DC electrodes provided between the first waveguides and on the first waveguides and used to generate DC electric fields in the first waveguides; and second Mach-Zehnder parts respectively associated with the first waveguides and comprising second waveguides coupled with each of the first waveguides and second DC electrodes used to generate DC electric fields in the second waveguides, at least one of the second Mach-Zehnder parts being configured to have no second DC electrode provided between the second waveguides included in one of said at least one of the second Mach-Zehnder parts and have the second DC electrodes provided on the second waveguides included in said one of said at least one of the second Mach-Zehnder parts.