脉冲泵浦掺铒光纤增益调制特性的研究

Research into Gain Modulation Characteristics of Erbium-Doped Fiber Pumped by Pulsed Laser

本文研究了预激光调Ｑ选模ＹＡＧ倍频激光脉冲泵浦掺铒光纤（ＥＤＦ）的荧光特性。由于存在信号光诱导的共振受激辐射，反转粒子数迅速地回复到基态，受激辐射寿命比亚稳态寿命低四个量级。基于这一效应，本文研究了调制的１．４６μｍ半导体激光器泵浦ＥＤＦ，观察到１０ｋＨｚ以上增益调制，可用以设计快速响应的有源光纤开关器件。

The fluorescence characteristics of erbium--doped fiber (EDF) pumped by a frequencydoubled Nd.YAG pulsed laser is reported. Owing to the resonance-stimulated radiation induced by signal, the inverse population rapidly transmits to the ground state. The lifetime of stimulated radiation is four orders of magnitude faster than that of the metastable level, which can be used in high--speed all optical switching devices.Based on this effect,we have got more than 10 kHz repetition frequency modulation of the EDFs gain pumped by a repetition frequency pulsed semiconductor laser at the wavelength of 1.46 μ m.