06025947 is referenced by 45 patents and cites 12 patents.

An optical amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The optical attenuator passes the amplified light signal and has a variable light transmissivity. Prior to varying the number of channels in the light signal, the controller varies the light transmissivity of the optical attenuator so that a power level of the amplified light signal is maintained at an approximately constant level that depends on the number of channels in the light signal prior to the varying the number of channels. While the number of channels in the light signal is being varied, the controller maintains the light transmissivity of the optical attenuator to be constant. Subsequent to varying the number of channels in the light signal, the controller varies the light transmissivity of the optical attenuator so that a power level of the amplified light signal is maintained at an approximately constant level that depends on the number of channels in the light signal subsequent to the varying the number of channels.

Title
Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied
Application Number
8/845847
Publication Number
6025947
Application Date
April 28, 1997
Publication Date
February 15, 2000
Inventor
Susumu Kinoshita
Kawasaki
JP
Yasushi Sugaya
Kawasaki
JP
Agent
Staas & Halsey
Assignee
Fujitsu
JP
IPC
H01S 3/16
H04B 10/02
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