Apparatus and method for monitoring an optical transmission...

Details Apparatus and method for monitoring an optical transmission... Apparatus and method for monitoring an optical transmission...

2002-10-28

2008-05-06

Tran, Dzung (Department: 2613)

Optical communications

Diagnostic testing

Test signal

C398S017000, C398S032000, C398S033000

Reexamination Certificate

active

07369763

ABSTRACT:
An apparatus and a method for monitoring an optical transmission line. An optical pilot signal of a predetermined duration is transmitted along said optical transmission line and a return signal is sent back from a signal returner along the same transmission line corresponding to at least part of said optical pilot signal. The signal returner is positioned at a predetermined point along the optical transmission line. An optical detection apparatus detects said optical pilot signal and also detects said return signal. A monitoring unit receives detection signals from said optical detection apparatus and determins the time relationship between the predetermined duration of the optical pilot signal and the round-trip transit time of the optical pilot signal. A first monitoring signal is generated when the determined time relationship has a predetermined value, and at least one further monitoring signal is generated in other cases.

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patent: 6388741 (2002-05-01), Beller
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patent: 4428350 (1995-03-01), None
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