Optical communications – Optical repeater system – Monitoring
Reexamination Certificate
2006-03-08
2010-02-02
Phan, Hanh (Department: 2613)
Optical communications
Optical repeater system
Monitoring
C398S181000, C398S038000, C398S033000, C398S037000, C359S341410, C359S337100, C359S341420
Reexamination Certificate
active
07657187
ABSTRACT:
An optical transmission apparatus for amplifying and relaying a wavelength-division-multiplexed optical signal includes (1) a variation-detecting unit which detects varying speed of input power of the wavelength-division-multiplexed optical signal and compares the varying speed with a set value, (2) an optical amplifying unit which amplifies the wavelength-division-multiplexed optical signal at a fixed amount of amplification, (3) a variable optical attenuating unit which variably attenuates the wavelength-division-multiplexed optical signal, (4) and a controlling unit which controls attenuation amount of the variable optical attenuating unit in accordance with the varying speed.
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patent: 10-51057 (1998-02-01), None
NEC Corporation
Phan Hanh
Sughrue & Mion, PLLC
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