Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Patent
1998-08-25
1999-11-30
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
359134, 359161, 359341, H04B 1000, H04J 1402, H01S 300
Patent
active
059952741
ABSTRACT:
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.
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Kinoshita Susumu
Sugaya Yasushi
Fujitsu Limited
Moskowitz Nelson
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