Patent ID: 11901939
Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An optical receiver comprising:
an optical amplifier that amplifies an optical signal in which multiple wavelengths are multiplexed;
a current source that drives the optical amplifier;
an optical demultiplexer that demultiplexes the amplified optical signal into the multiple wavelengths;
photodetectors, each detecting one of the demultiplexed wavelengths;
a monitor circuit that monitors light intensities of the demultiplexed wavelengths detected by the photodetectors;
a processor; and
a memory,
wherein the memory has information representing a relationship between a total incident light intensity of the optical signal incident onto the optical amplifier and a gain of the optical amplifier for each of the multiple wavelengths, and
wherein the processor repeats
first calculation for determining the gain of each of the multiple wavelengths of the optical signal, with reference to the information in the memory, based on a drive current of the current source and an estimation value of the total incident light intensity of the optical signal incident onto the optical amplifier,
second calculation for calculating an incident light intensity of each of the multiple wavelengths of the optical signal incident onto the optical amplifier, based on the determined gain of each of the multiple wavelengths and a monitored light intensity of each of the demultiplexed wavelengths acquired from the monitor circuit, and
third calculation for calculating the total incident light intensity of the optical signal incident onto the optical amplifier based on a sum of incident light intensities of the multiple wavelengths acquired by the second calculation, until the total incident light intensity converges.