Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-09-07
2010-02-09
Singh, Dalzid (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S033000, C398S038000, C398S197000
Reexamination Certificate
active
07660530
ABSTRACT:
An optical transmission apparatus includes a transmitting unit for transmitting an optical signal with a specified wavelength, a multiplexing unit for multiplexing the optical signal with the specified wavelength and an optical signal with a wavelength other than the specified wavelength and outputting the multiplexed signal as a wavelength division multiplexed optical signal, an optical amplifier for amplifying the wavelength division multiplexed optical signal outputted from the multiplexing unit, a level detecting unit detecting a variation of an optical power of the wavelength division multiplexed optical signal inputted to the optical amplifier, and a level adjusting unit for adjusting, when a variation of the optical power of the wavelength division multiplexed optical signal is detected by the level detecting unit, a transmitting power of the optical signal with the specified wavelength transmitted from the transmitting unit so that an output power becomes a level before the variation.
REFERENCES:
patent: 6040933 (2000-03-01), Khaleghi et al.
patent: 6271945 (2001-08-01), Terahara
patent: 2002/0154356 (2002-10-01), Krummrich
patent: 2006/0018658 (2006-01-01), Mori
patent: 2002-290331 (2002-10-01), None
NEC Corporation
Singh Dalzid
Whitham Curtis Christofferson & Cook PC
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