Patent ID: 11949460
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. An optical communication control method for an optical communication system that includes an optical line terminal and a plurality of optical network units connected by optical transfer paths, the method comprising:
transmitting, by an optical transmitting/receiving unit of the optical line terminal, an optical signal to the plurality of optical network units or receiving, by the optical transmitting/receiving unit, multiple optical signals from the plurality of optical network units, via the optical transfer paths,
receive, by a control unit of the optical line terminal, a monitoring value of the optical signal at a first optical network unit included in the plurality of optical network units, wherein the monitoring value changes according to a receive signal quality of the optical signal,
determining, by the control unit of the optical line terminal, that the monitoring value has changed to a value indicating deterioration of the receive signal quality,
determining, by the control unit of the optical line terminal, an adjust power value based on an upper limit value and a lower limit value for each of the plurality of optical network units, and
changing, by the control unit of the optical line terminal, a launch power of the optical signal based on the adjust power value to obtain a changed optical signal, such that, a receive power of the changed optical signal in each of the plurality of optical network units is lower than or equal to an upper limit value of the corresponding optical network unit and a receive power of the changed optical signal in the first optical network unit is higher than or equal to a lower limit value of the first optical network unit.