System for detecting fault in optical-transmission path

Details System for detecting fault in optical-transmission path System for detecting fault in optical-transmission path

2005-03-16

2008-09-23

Pak, Sung (Department: 2874)

Optical waveguides

With optical coupler

Plural

C398S001000, C398S015000, C398S017000, C398S020000

Reexamination Certificate

active

07428354

ABSTRACT:
An optical transmission-path fault-detection system for detecting a fault in an optical-transmission path connecting an optical communications apparatus and an optical amplifier corresponding to the communications apparatus is disclosed. The system includes a first light-beam source connected via a first optical transmission path to the optical amplifier for transmitting a light beam to the first optical-transmission path, first optical-detection means for detecting the light beam which is transmitted from the first light-beam source and input via the first optical-transmission path, the optical amplifier and a second optical-transmission path, and first fault-determining means for determining, when a light-beam level detected by the first optical-detection means is lower than a predetermined level, that the fault has occurred in one of the first optical-transmission path and the second optical-transmission path, and determining, when the light-beam level is at or higher than the predetermined level, that the first optical-transmission path and the second optical-transmission path are normal.

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