| 摘要 |
A monitoring apparatus for an optical fiber amplifier includes a branch member, an optical filter, a light-receiving element, and a detector. The branch member branches reflected light obtained by reflecting, by an output portion, output light from an optical fiber amplifier for directly amplifying an optical signal. The optical filter removes a signal wavelength component from the reflected light branched by the branch member. The light-receiving element receives the reflected light output from the optical filter from which the signal wavelength component is removed. The detector outputs a detection signal representing an abnormality on a transmission path when the output level of the light-receiving element is a predetermined level or higher.
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