| 摘要 |
An optical waveguide type wavelength filter having a Fabry-Perot resonator portion formed in the waveguide. The Fabry-Perot resonator portion has a length corresponding to the resonator length of the propagated light and formed by cutting at least two suitable gaps in the optical waveguide. By varying the index of refraction of the Fabry-Perot resonator portion by refractive index varying means, the resonator length L of the Fabry-Perot resonator portion is optically varied and, thereby, the filter characteristic of the Fabry-Perot resonator portion can be made variable.
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