Patent ID: 6414768
Filing Date: 2002-07-02
Classification: H04B,H04J,H04Q

Abstract:
An optical communication system comprising:an office device that includes a pair of optical transmitting/receiving devices for act and standby systems; a subscriber line that is a ring network of an optical fiber of which one terminal is connected to said optical transmitting/receiving device of the act system and the other terminal is connected to said optical transmitting/receiving device of the standby system; a plurality of optical power branching/coupling elements that are passive elements arranged on said subscriber line to branch the subscriber line; a plurality of subscriber devices arranged corresponding to said optical branching/coupling element to be connected to the branched lines from the optical branching/coupling elements; means for specifying fault points in said subscriber line; and means for controlling said optical transmitting/receiving devices, wherein said controlling device actuates said optical transmitting/receiving device of said act system in normal state and actuates both of said optical transmitting/receiving devices when said detecting means detect any faults.