| 摘要 |
An optical apparatus having a loss compensation capability includes between an input connector 1 A and an output connector 1 B an input side optical parts 2 including an input monitor, an amplification medium 3 , a loss medium 4 , and an output side optical parts 5 including an output monitor in this order, and is provided with a control circuit 6 for controlling a gain based on a monitor result of input/output light. The amount of reflection attenuation on all points, on which the light can be reflected on the optical path from the output end of the amplification medium 3 to the output connector 1 B, can be smaller than the amount of reflection attenuation on the end face of the output connector 1 B.
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