Patent ID: 11949448
Assignee: NEC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A communication method in a submarine optical communication system including: a submarine cable that accommodates a first transmission line, a second transmission line, and a third transmission line that enable light to propagate; a first terminal station; and a second terminal station being connected to the first terminal station via the submarine cable, the communication method comprising,
by the first terminal station:
monitoring first signal quality of dummy light from the second terminal station, the dummy light being acquired via the first transmission line;
outputting dummy light to the second terminal station via the second transmission line; and
transmitting an optical signal to the second terminal station via the third transmission line, the optical signal including the first signal quality of dummy light from the second terminal station, and

by the second terminal station:
outputting dummy light to the first terminal station via the first transmission line;
monitoring signal quality of dummy light from the first terminal station, the dummy light being acquired via the second transmission line; and
receiving the optical signal including the first signal quality from the third transmission line.