| 摘要 |
<p>An optical branching filter by which signals and noises of respective channels of wavelength-multiplexed lights are clearly separated from each other. The optical branching filter has a photodetector array comprising photodetectors receiving branched lights which are separated from a wavelength-multiplexed light in accordance with respective wavelengths and arranged linearly. The photodetector array has a plurality of photodetectors for signal monitoring and a plurality of photodetectors for noise monitoring. The signal monitoring photodetectors and the noise monitoring photodetectors are alternately arranged linearly in the direction of the arrangement of the branched lights.</p> |
