Erbium doped fiber optic amplifier Oscillation loop for optical control of gain

摘要

The oscillation loop of the present invention includes an erbium-doped optical fiber, a portion of the spontaneously emitted light amplified by the erbium-doped optical fiber is returned to the erbium-doped optical fiber in a wavelength selective manner, A first optical fiber coupler on the side of a signal light output end for dividing the oscillation light reflected by the reflection type filter means and reflected by the first optical fiber coupler, And a second optical fiber coupler on the side of a signal light input end for introducing the oscillation light returned back along the loop path into the erbium doped optical fiber. The oscillation loop of the present invention is simple and inexpensive, The amplification gain of the additive optical fiber amplifier is changed to the power change Not only can it be stably controlled at a constant value irrespective of the change of the power of the pump or the pump, but also the waveform distortion can be minimized at the time of amplification of the low-speed modulated signal.