| 摘要 |
PROBLEM TO BE SOLVED: To prevent the wavelength of an optical signal propagating on an active line from according with the light wavelength of an optical signal propagating on a detour line.SOLUTION: A control device performs control to: measure the wavelength of an optical signal from a station side transmission device; measure the wavelength of an optical signal from a subscriber side transmission device; make the amount of delay on an active line accord with the amount of delay on a detour line; adjust the wavelength of an optical signal transmitted to the station side transmission device via the detour line to keep an interference wave with the optical signal from the active line out of allowable reception light wavelength of the station side transmission device; and adjust the wavelength of an optical signal transmitted to the subscriber side transmission device via the detour line to keep the interference wave with the optical signal from the active line out of allowable reception light wavelength of the subscriber side transmission device. |
