Signal light interruption detecting method and optical...

Details Signal light interruption detecting method and optical... Signal light interruption detecting method and optical...

2006-11-07

2006-11-07

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S2140AG, C359S334000

Reexamination Certificate

active

07132646

ABSTRACT:
In an optical amplifier of the present invention, a part of an input light output from a transmission path fiber is branched as a monitor light, a frequency component corresponding to a period at which a header area of a framed signal light appears, is extracted, and when a voltage level of a direct-current signal obtained by direct-current converting the frequency component becomes lower than a reference voltage, the input interruption of the signal light is detected, to perform a shut-down control of a pumping light source. Thus, an optical amplifier of low cost capable of suppressing an influence of a noise light while ensuring the immediacy, is provided.

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patent: 6188508 (2001-02-01), Horiuchi et al.
patent: 2003/0137720 (2003-07-01), Onaka et al.
patent: 02-104153 (1990-04-01), None
patent: 62-092552 (1997-04-01), None
patent: 10-229365 (1998-08-01), None
Boston Electronics, “What is a Lock-In Amplifier?”, http://www.boselec.com/products/siglimwhat.html.

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