| 摘要 |
An object of the present invention is to improve the modulation efficiency of an optical modulator in a high frequency band while satisfying the velocity matching condition. An optical modulator (1A) is provided having an optical waveguide (3) for propagating light, an electrode (2B) for applying a voltage on the waveguide for modulating the light, a signal source electrically connected to the electrode and a terminating resistance electrically connected to the electrode. The signal source has a characteristic impedance Zi and the terminating resistance has an impedance Zl satisfying the formula (Z i < Z 1). Alternatively, the signal source has a characteristic impedance Zi and the electrode has a characteristic impedance Zc satisfying the formula (Z i < Z c). |
