Dynamic gain control system for optical amplifier and method the

Details Dynamic gain control system for optical amplifier and method the Dynamic gain control system for optical amplifier and method the

1997-03-28

1999-07-13

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359177, H01S 300

Patent

active

059234628

ABSTRACT:
The dynamic gain control system includes a pump source providing pump light. The dynamic gain control system measures a certain portion of the input pump light into the optical amplifier and measures a certain portion of the output pump light from the optical amplifier. The dynamic gain control determines the pump light loss based on the input pump light and output pump light measurements. Based on the pump light loss, the dynamic gain control system maintains the pump light loss relatively constant (for example 0.1 dB) independent of the number of input channels and their relative powers (for example, input channel powers of +50 dBm to 10 dBm) by providing feedback to control the output pump light. In doing so, the dynamic gain control system maintains the inversion level of the optical amplifier. A relatively constant inversion level corresponds to only small variations in the gains of the input channels (multi-channel gain) as a result of changes in the input channels to the optical amplifier.

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"Fast Gain Control In An Erbium-Doped Fiber Amplifier", by K. Srivastava, Y. Sun, J. L. Zyskind, J. W. Sulhoff, C. Wolf and R. W. Tkach. Bell Laboratories, pp. PDP 4-2 -4-5.
"Asymmetric Control Laser Cavity Design For Low Noise Operation of An All-Optical Gain Controlled Erbium-Doped Fibre Amplifier", by J. Massicott, C. Lebre, R. Wyat, R. Kashyap and D. Williams.; FB2-1. p. 77,78.
"Dynamic Compensation Of Transient Gain Saturation In Erbium-doped Fiber Amplifers By Pump Feedback Control", by K. Motoshima, D. N. Chen, L. M. Leba, M. M. Downs, T. Li, and E. Dessurvire. OFC/100C Technical Digest. pp. 40-42.

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