| 摘要 |
<p>An optical transmission path failure detection system for detecting failure of an optical transmission path connecting an optical communication device to an optical amplifier corresponding to the communication device. Light emitted from a first light source and incident via a first optical transmission path, an optical amplifier, and a second optical transmission path is detected. When the detected light has a level below a predetermined level, it is judged that the first or the second optical transmission path has failed. When the detected light has a level equal to or above the predetermined level, it is judged that the first and the second optical transmission path are both normal. This can assure detection of failure of an optical transmission path connecting an optical communication device to an optical amplifier.</p> |
