| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform line monitoring of an optical network with high accuracy, with in-services and at low cost. <P>SOLUTION: An optical receiver for measuring light receiving power of a received optical signal to determine abnormality of an optical network to be connected is provided with a light-receiving power measuring means for measuring light receiving power by fixed time, and a light-receiving power comparing and determining means for receiving the light-receiving power measured by the light-receiving power measuring means by fixed time, and determining an abnormality to output an abnormality determination signal, when it detects the abnormality by the prescribed number of times in succession by comparing each light-receiving power with a threshold, or when it detects the abnormality by a specified number of times, with respect to the number of times by comparing each light-receiving power with the threshold. <P>COPYRIGHT: (C)2010,JPO&INPIT |
