| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical demultiplexing device in which the size of the device and the cost the reduced and the optical signals made by multiplexing optical signals of plural wavelength bands are demultiplexed. SOLUTION: The device has an optical circulator 28, a fiber grating FBG1 which reflects the optical signals of a wavelength bandλ1 among the optical signals outputted from a port P2 and passes the optical signals of other wavelength bands, a fiber grating FBG2 which reflects the optical signals of a wavelength bandλ2 among the optical signals outputted from a port P2 and passes the optical signals of other wavelength bands, and a fiber grating FBG3 which reflects the optical signals of the bandλ1 among the optical signals outputted from a port P3 and passes the optical signals of other wavelength bands. |
