| 摘要 |
An optical demultiplexer comprises light input means, a collimator lens, a substrate having a diffraction grating, photodetecting means for receiving light dispersed by the diffraction grating. The diffraction grating is of a reflection type and has a light-transmitting region at least at part of the reflecting surface. The light input means and the photodetecting means are opposed to the reflection diffraction grating through the collimator lens. A method of assembling an optical demultiplexer including an input optical fiber, a collimator lens, a diffraction grating having a reflecting surface which has partly a light-transmitting region, and photodetecting means for receiving light dispersed by the diffraction grating, comprises monitoring the light transmitted through the light-transmitting region and thereby adjusting the position of the optical axis of the diffraction grating.
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