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Abstract

To provide an optical repeater and an optical communication system that suppress voltage consumption when an odd number of light sources are provided. An optical repeater according to the present disclosure includes at least n units being an odd number equal to or more than 3, wherein the n units each include an excitation light source, a first optical demultiplexer, a second optical demultiplexer, a first optical multiplexer, and a second optical multiplexer, the first optical demultiplexer demultiplexes excitation light from the excitation light source into 1:n−1, the second optical demultiplexer demultiplexes, into n−1 pieces of excitation light, excitation light demultiplexed by the first optical demultiplexer with a ratio of n−1, the second optical demultiplexer further outputs excitation light demultiplexed to each of the first optical multiplexers belonging to n−1 units other than a unit to which the second optical demultiplexer belongs.

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First Claim