Optical communication system

Details Optical communication system Optical communication system

2008-05-20

2008-05-20

Singh, Dalzid (Department: 2613)

Optical communications

Fault recovery

Bypass inoperative element

C398S007000, C398S015000, C398S017000, C398S033000, C398S034000, C398S038000, C398S094000, C398S162000, C398S193000, C398S197000

Reexamination Certificate

active

07376348

ABSTRACT:
An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission line in use, interconnecting the optical transmission equipment concerned with neighboring upstream optical transmission equipment, and outputs the optical signals including a signal component and a noise component. A controller controls an optical signal level so that a signal component in the optical signal reaches a predetermined level. The controller corrects the optical signal level when the transmission line transmitting the optical signal is switched either from the main transmission line to the backup transmission line or from the backup transmission line to the main transmission line, either between the optical transmission equipment concerned and a neighboring upstream optical transmission equipment, or between other two optical transmission equipment sets located on an upstream side.

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European Office Action dated Nov. 27, 2007 for corresponding European Patent Application No. 01274906.5-1246.
European Patent Office Communication dated Oct. 5, 2007.

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