Patent ID: 11914191
Assignee: NEC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An optical branching/coupling device comprising:
a first add/drop circuit configured to output, to a first line, a third optical signal acquired by multiplexing a first optical signal received from the first line with a second optical signal to be inserted into the first line, and outputting the first optical signal; and
a second add/drop circuit configured to receive the first optical signal, receiving, from a second line different from the first line, a sixth optical signal acquired by wavelength-multiplexing a fourth optical signal with a fifth optical signal to be dropped from the second line, demultiplexing the fourth optical signal and the fifth optical signal, and outputting, to the second line, a seventh optical signal acquired by multiplexing the fourth optical signal with the first optical signal transmitted by the first add/drop circuit.