| 摘要 |
PURPOSE: To provide the characteristic measuring method of an optical intensity modulator, in which the parameter of the optical intensity modulator can be measured with high accuracy in a simple and low-cost constitution and to provide the control method of an optical intensity modulator, which can control the characteristic of the optical intensity modulator without hardly affecting a modulated signal waveform and a transmission characteristic. CONSTITUTION: A first light-emitting means 1 emits first light, the optical intensity of which has been modulated, by an optical intensity-to-be-measured modulator 8 in which a phase is modulated by a control signal and to which a sine- wave electric signal of a specific frequency is applied. A mixing means 3 mixes the first light and second light, from a second light-emitting means 2, whose wavelengths are different so as to be made incident on a photodetector 4. A control means 5 controls an optical phase modulator 7 by generating a level- variable signal in such a way that the level of a prescribed odd-order sideband frequency signal near a frequency corresponding to the wavelength difference between the first light and the second light in the output electric signal of the photodetector 4 becomes minimum. |
