Patent ID: 11942991
Assignee: NEC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A non-transitory computer-readable medium storing a program which, if executed by a computer, implements operations comprising:
controlling a switching unit in an optical submarine branching apparatus, the switching unit being connected to a plurality of first optical fiber transmission lines connecting the optical submarine branching apparatus to a first terminal station, a plurality of second optical fiber transmission lines connecting the optical submarine branching apparatus to a second terminal station, and a third optical fiber transmission line connecting the optical submarine branching apparatus to a third terminal station, to switch a transmission route of a wavelength-multiplexed optical signal to be executed,
wherein the controlling includes connecting each of the plurality of first optical fiber transmission lines to a preset one of the plurality of second optical fiber transmission lines and switching any one of the plurality of first optical fiber transmission lines to connect to the third optical fiber transmission line,
wherein each optical fiber transmission line in the plurality of first optical fiber transmission lines, the plurality of second optical fiber transmission lines, and the third optical fiber transmission line includes a fiber pair comprising an optical fiber for optically transmitting information from the first terminal station side and an optical fiber for optically transmitting information to the first terminal station side, and
wherein the switching unit includes a configuration in which a first optical switch including an input path and two output paths and a second optical switch including two input paths and two output paths are connected in multi-stages, and the first optical switch and the second optical switch connected in the multi-stages each have a different one of the first optical fiber transmission lines as an input.