Optical: systems and elements – Optical amplifier – Beam combination or separation
Reexamination Certificate
2006-10-10
2006-10-10
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Beam combination or separation
C359S337110
Reexamination Certificate
active
07119950
ABSTRACT:
In an optical amplifier of the invention, a WDM signal light is separated into N components by a demultiplexer after which each component is amplified by N optical amplifier sections, and the output light level of each optical amplifier section is controlled to a constant level by respective control circuits and multiplexed in a multiplexer. At this time, in the demultiplexer, the bandwidth of the signal light output from each of the output ports is designed to have a different value, so that inter-wavelength deviation in the optical output level that occurs in each of the optical amplifier sections, falls within a preset range. Moreover, the constant output control of each control circuit is performed by individually adjusting the gain of each of the optical amplifier sections in relation to fluctuations in the power level without channel number changes of the WDM signal light input to the demultiplexer. As a result, deviation in the optical output level over the entire wavelength bandwidth of the WDM signal light for fluctuations in the input level of the WDM signal light, can be suppressed to a minimum, with a simple configuration.
REFERENCES:
patent: 6307668 (2001-10-01), Bastien et al.
patent: 6885499 (2005-04-01), Hoshida et al.
patent: 2001-53686 (2001-02-01), None
patent: 2002-57389 (2002-02-01), None
Hayashi Etsuko
Ohshima Chihiro
Fujitsu Limited
Hellner Mark
Staas & Halsey , LLP
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