| 摘要 |
An optical demultiplexer for use in a low-power, high-density wavelength division multiplexing (WDM) optical transmission device has a plurality of optical wavelength filters. The optical wavelength filters each include a first input port for receiving a input optical signal, a first output port for outputting only an optical signal having a predetermined wavelength component in the input optical signal, and a second output port for outputting an optical signal having wavelength components other than the predetermined wavelength component. The second output ports of the optical wavelength filters are serially connected to the first output ports of their adjacent optical wavelength filters. Each optical wavelength filter receives an optical signal having a plurality of wavelength components, separates an optical signal having a predetermined wavelength component from the input optical signal, and outputs the optical signal having the predetermined wavelength component via the first output port thereof, and an optical signal having the other wavelength components other than the predetermined wavelength component to the input port of its adjacent optical wavelength filter, which is connected to its second output port, in order to separate an optical signal having another predetermined wavelength component. |
