Negative feedback optical amplification effect based on cross-gain modulation in semiconductor optical amplifiers

摘要

A negative feedback optical amplification effect was confirmed using negative feedback based on cross-gain modulation in an InGaAsP/InP semiconductor optical amplifier. The optical amplifier with negative feedback was capable of providing an output signal whose gain, wave form and baseline, were stabilized optically. The distortion of the wave form was extremely small in a wide frequency band of 0.1-10 GHz. In addition, the gain can be adjusted by controlling the amount of negative feedback power using a variable optical attenuator. In physics, the optical amplifier is considered as the optical equivalent of a noninverting operational amplifier in electronics.