| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength multiplex transmitter at a low cost. SOLUTION: A wavelength multiplex optical path changeover means 3 is provided to the outside of an active system module 1 and a standby system module 2 that conduct add/drop of a bus in the unit of wavelengths. In the case of selecting the redundant module, the wavelength multiplex optical path changeover means 3 switches paths for optical signals altogether in the unit of wavelength multiplexed lights. |
