| 摘要 |
An optical tap for selecting a signal of only a certain wavelength from transmitted signals which are wavelength division-multiplexed. The tap transmits signals of other wavelengths as they are. The tap has an input optical fiber for receiving the wavelength division-multiplexed signals, a first diffraction grating for dispersing the incident light through a different angle for each different wavelength, a reflecting mirror for reflecting the certain wavelength of the dispersed light signal to select this wavelength, a first output fiber for delivering only the selected light, a second diffraction grating which concentrates the unreflected light, and a second output fiber for delivering the unselected wavelengths.
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