Patent ID: 11916589
Assignee: NEC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A submarine device comprising:
a first branching unit that branches an optical signal and that outputs first branched light;
a processing unit that processes the first branched light as an input optical signal and outputs an output optical signal;
a second branching unit that branches the output optical signal output from the processing unit and that outputs second branched light;
a selecting unit that selects branched light from the first branched light and the second branched light, and that outputs the branched light; and
a monitoring unit that monitors the selected branched light, wherein
the selecting unit includes an N×N variable optical attenuator having a plurality of port pairs, each port pair including an input port and an output port, and
for each of the plurality of port pairs, the attenuator attenuates a port optical signal at the input port of the port pair according to a control and outputs the attenuated port optical signal at the output port of the port pair.