| 摘要 |
PURPOSE: To miniaturize a filter and to enable it to be used for tunable laser and optical communication by providing multiple resonance cavities wherein an optoelectronic material is contained inside and reflection surfaces are provided at bath ends. CONSTITUTION: Multiple resonance cavities 48 and 49 wherein an opt-electric material 32 is contained inside and reflection surfaces 34-37 are provided at both ends are provided to a filter. When a device is tuned to an arbitrary wave lengthλ, a specified single voltage is applied to an electrode 31. When the voltage is applied to the electrode 31, the reflectance of an apt-electronic material in the cavity 48 is adjusted to a pre-determined value so that the cavity 48 is resonated with the wave lengthλ. Therefore, a standing wave of n-times of half-wavelengthλexists in the resonance cavity. When the material of the resonance cavity 49 is identical with that of the cavity 48, the reflectance in the cavity 49 is a specified value, thus, as desired, the standing wave of m-times of half-wavelength of wavelengthλexists in the resonance cavity 49. Thus a filter can be miniaturized, and can be used for a tunable laser and optical communication.
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