| 摘要 |
An optical modulation device configured of a planar optical waveguide, includes: a light incidence unit which allows light to be incident on the planar optical waveguide; a Mach-Zehnder interferometer which includes a first optical splitter section branching the light incident on the light incidence unit, two arm portions guiding the light branched by the first optical splitter section, a phase modulation unit linearly disposed on each of the two arm portions, and a first optical coupler section combining the light guided from the two arm portions; a light launching unit which launches the light combined by the first optical coupler section from the planar optical waveguide; and a traveling-wave electrode which includes an input unit and an output unit, and applies a voltage to the phase modulation unit. Also, the planar optical waveguide has an outline including two sides each of which intersect with an extended line in a longitudinal direction of the phase modulation unit in a plan view, the input unit is formed on one of the two sides, and the light incidence unit and the light launching unit are positioned in a region different from a region in which the traveling-wave electrode is formed in a plan view. |
