Gain-controllable optical amplifier and optical gain-control met

Details Gain-controllable optical amplifier and optical gain-control met Gain-controllable optical amplifier and optical gain-control met

1996-02-26

1998-01-20

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359179, 372 6, H01S 300, H01S 3131, C02B 600

Patent

active

057106606

ABSTRACT:
This invention provides an optical amplifier which has low noise characteristics for a wide range of input signal electric power. The optical amplifier has a plurality of cascaded optical amplifying units, a signal level detector, and a pump-source controller. The pump-source controller changes controlling objects from a pump-source corresponding to a first one of the optical amplifying units to a pump-source corresponding to a second one of the optical amplifying units according to a detection level of the signal level detector from a low level to a high level. When the detection level is outside of a control object range, the optical amplifier controls an output from the pump-source to stabilize. When the detection level is within the control object range, the optical amplifier controls an output from a pump-source of each of optical amplifying units according to the detection level.

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S. Konoshita, M. Suyama & H. Kuwahara "Novel Configuration for Low Noise Er-Doped Fiber Optical Amplifiers During Automatic-Level-Controlled Operation" pp. 166-169.
Nakagawa et al, NTT Transmission System Laboratories, PdP11-1; <Oct. 13, 1995.

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