Optical communications – Diagnostic testing – Fault location
Reexamination Certificate
2008-04-21
2010-02-16
Pascal, Leslie (Department: 2613)
Optical communications
Diagnostic testing
Fault location
C398S006000, C398S157000
Reexamination Certificate
active
07664392
ABSTRACT:
The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed. According to the result of the continuity detection, the power state at the occurrence of line fault is automatically restored to the power state at a time of normal operation.
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Deguchi Hiroyuki
Funatsu Gentaro
Harasawa Shin-ichirou
Maeda Hideki
Naka Akira
Fujitsu Limited
Nippon Telegraph and Telephone Corporation
Pascal Leslie
Staas & Halsey , LLP
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