Optical modulator and optical transmitter

An optical transmitter comprising:

• a light emitting element that emits light;
• a data generating circuit that generates modulated data;
• a driver that generates an electrical signal corresponding to the modulated data output from the data generating circuit;
• and
• an optical modulator that based on the electrical signal output from the driver, modulates the light emitted from the light emitting element, wherein
• the optical modulator includes:
• a Mach-Zehnder optical waveguide that includes:
• a pair of parallel waveguides;
• and
• a two-input-one-output optical coupler that couples light output from the parallel waveguides;
• a branching waveguide that branches a portion of light output from the optical coupler;
• and
• a light receiving unit that receives the light output from the branching waveguide,
• orientation of an output end of the branching waveguide is angled toward the light receiving unit, to be oblique with respect to the parallel waveguides, and
• orientation of an output end of the optical coupler is angled toward a side opposite to that of the output end of the branching waveguide, to be oblique with respect to the parallel waveguides.