Optical communications – Optical repeater system – Supervisory signal by repeater
Reexamination Certificate
2007-02-06
2007-02-06
Phan, Hanh (Department: 2613)
Optical communications
Optical repeater system
Supervisory signal by repeater
C398S173000, C398S175000, C398S177000, C398S013000, C398S015000, C398S020000, C398S021000, C398S032000, C398S033000, C398S037000, C398S038000, C359S341430, C359S337000
Reexamination Certificate
active
10099965
ABSTRACT:
A transmission system is provided that recognizes occurrence of a fault efficiently so that the workability and quality of service can be improved. An optical amplifier part amplifies an optical main signal. A fault occurrence recognizing part detects a pump light used for an opposing device via an optical fiber transmission line to which an optical main signal is sent by the repeater. If the pump light is not detected, the fault occurrence recognizing part recognizes occurrence of a fault. A light cutoff control part stops the optical amplifying part outputting an amplified signal so that the light cutoff control in only one of two directions is performed when a fault occurs.
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Fujitsu Limited
Phan Hanh
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