| 摘要 |
An optical demultiplexer has light input means, a collimator lens, a substrate with a diffraction grating formed thereon, and light detecting means for detecting light demultiplexed by the diffraction grating. The diffraction grating comprises a reflective diffraction grating having a reflecting surface. The light input means and the light detecting means face the reflective diffraction grating with the collimator lens interposed therebetween. The reflecting surface includes a light transmitting area in at least a portion thereof. An optical demultiplexer having an input optical fiber, a collimator lens, a diffraction grating having a reflecting surface which includes a partial light transmitting area, and light detecting means for detecting light demultiplexed by the diffraction grating is assembled by monitoring light having passed through the light transmitting area and adjusting the position of the optical axis of the diffraction grating.
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