| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration of communication quality of an optical communication system including an optical multiplexing/branching device for controlling divergence and insertion of a wavelength multiplexed optical signal.SOLUTION: An optical multiplexing/branching device 10 according to the invention includes a branch circuit, a first variable attenuator 17, and a multiplex circuit. The branch circuit divides a wavelength multiplexed optical signal 100 input from a first transmission path 41 into a first wavelength multiplexed optical signal 101 and a second wavelength multiplexed optical signal 102. The first variable attenuator 17 attenuates the second wavelength multiplexed optical signal 102 according to loss corresponding to the optical level of a third wavelength multiplexed optical signal 103 input from a second transmission path 44. The multiplex circuit multiplexes the second wavelength multiplexed optical signal 102 input via the first variable attenuator 17, the first wavelength multiplexed optical signal 101, and the third wavelength multiplexed optical signal 103, and outputs the multiplexed signal to a third transmission path 42. |
