Controller which controls a variable optical attenuator to contr

Details Controller which controls a variable optical attenuator to contr Controller which controls a variable optical attenuator to contr

1999-09-20

2000-11-07

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

359160, 359341, H04B 1002, H01S 316, H04J 1402

Patent

active

061444855

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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European Search Report of application No. 97107189.9-2209-dated Aug. 13, 1999.
U.S. application No. 09/139,768, filed Aug. 25, 1998.
U.S. application No. 09/328,368, filed Jun. 9, 1999.

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