Dynamic gain-controlled erbium-doped fiber amplifier

摘要

1. TECHNICAL FIELD OF THE INVENTION;The present invention relates to an optical gain controlled fiber amplifier.;2. Technical problem to be solved by the invention;An object of the present invention is to provide an automatic gain controlled optical fiber amplifying apparatus which maintains constant output per channel of an optical amplifier regardless of transmission line loss or change in the number of input channels, and has a high operating speed and a simple structure.;3. Summary of the Solution of the Invention;An optical gain controlled optical fiber amplifying apparatus comprising: first optical branch means for branching a part of an optical signal input to the optical fiber amplifying apparatus; Second optical branch means for branching a part of the optical signal output from the optical fiber amplifying apparatus; Optical distribution means for receiving and dividing an input side optical signal partially divided by the first optical branch means; First optical wavelength selection means for receiving an optical signal of one side distributed by the optical distribution means and selecting an optical signal having a specific wavelength; Second optical wavelength selecting means for receiving an output optical signal partially branched by the second optical branch means and selecting an optical signal having a specific wavelength; A signal for measuring the total input signal strength and the number of input channels using the optical signal of the other side distributed by the optical distribution means and the optical signal of a specific wavelength selected by the first and second optical wavelength selection means. Processing means; Control means for generating a control signal according to the total input signal strength and the number of input channels measured by said signal processing means; And optical amplification and attenuation means for amplifying and attenuating the input optical signal from the first optical branch means by the control signal of the control means to output to the second optical branch means.;4. Important uses of the invention;The present invention is used in a multi-wavelength optical transmission system and the like.