METHOD FOR FAULT DETECTION AND CONTROL OF OPTICAL LINE

PROBLEM TO BE SOLVED: To provide a method for detecting faults of an optical line with reduced cost, capable of obtaining fault information of the optical line at a plurality of relay points installed in the middle of the optical line, and immediately performing a relevant control based on the obtained fault information, and a method for controlling the fault occurrence using the above fault detection method. SOLUTION: Signal light on optical fiber lines 2a, 2b constituted of optically continuous forward and backward paths are continuously detected at the plurality of relay points B-J, and the fault occurrence on the optical fiber lines 2a, 2b is detected at the plurality of relay points B-J by the signal light level becoming a predetermined value or lower, so as to obtain as fault information. From the obtained fault information, the relevant control unit to each relay point is controlled. COPYRIGHT: (C)2008,JPO&INPIT