OPTICAL MODULATOR

摘要

Provided is an optical modulator comprising an optical waveguide (3) and a traveling-wave electrode (4), which includes an interaction unit (9) for modulating the phase of a light, and an inputting field-through unit (7). The optical modulator further comprises at least one impedance conversion unit for reducing the impedance mismatch between the characteristic impedance of the interaction unit and the characteristic impedance of at least one of the inputting field-through unit, a connector to be electrically connected with the inputting field-through unit and an external circuit. The impedance conversion unit has a characteristic impedance, which is different from the geometrical mean of the characteristic impedance of the interaction unit and the characteristic impedance of the inputting field-through unit, the geometrical mean of the characteristic impedance of the interaction unit and the characteristic impedance of the connector, or the geometrical mean of the characteristic impedance of the interaction unit and the characteristic impedance of the external circuit.