Optical modulation device

An optical modulation device comprising:

• a Mach-Zehnder modulator that includes a mesa-shaped semiconductor waveguide formed on a substrate;
• a plurality of phase modulators of transmission line type that are spaced from each other along the semiconductor waveguide of the Mach-Zehnder modulator;
• a first amplifier that is coupled with an input transmission line transmitting an electrical signal, has an input impedance substantially equal to a characteristic impedance of the input transmission line, and amplifies the electrical signal;
• a first interconnection that is coupled to the first amplifier and transmits the electrical signal to a first end of one of the plurality of phase modulators that is provided on an input side of the Mach-Zehnder modulator;
• a second interconnection that is coupled to the first amplifier and transmits the electrical signal to a first end of another of the plurality of phase modulators that is provided on an output side of the Mach-Zehnder modulator;
• and
• a plurality of termination resistors that are respectively coupled to second ends of the plurality of phase modulators.