Influences of finite gain bandwidth on pulse propagation in parabolic fiber amplifiers with distributed gain profiles  

作　　者：赵佳生 李磐 陈晓东 冯素娟 毛庆和 

机构地区：[1]Anhui Provincial Key Laboratory of Photonics Devices and Materials,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences [2]University of Science and Technology of China

出　　处：《Chinese Physics B》2012年第9期345-352,共8页中国物理B（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China (Grant No. 2011AA030203);the National Basic Research Program of China (Grant No. 2007CB936603)

摘　　要：The evolutions of the pulses propagating in decreasing and increasing gain distributed fiber amplifiers with finite gain bandwidths are investigated by simulations with the nonlinear SchrSdinger equation. The results show that the parabolic pulse propagations in both the decreasing and the increasing gain amplifiers are restricted by the finite gain bandwidth. For a given input pulse, by choosing a small initial gain coefficient and gain variation rate, the whole gain for the pulse amplification limited by the gain bandwidth may be higher, which is helpful for the enhancement of the output linearly chirped pulse energy. Compared to the decreasing gain distributed fiber amplifier, the increasing gain distributed amplifier may be more conducive to suppress the pulse spectral broadening and increase the critical amplifier length for achieving a larger output linearly chirped pulse energy.The evolutions of the pulses propagating in decreasing and increasing gain distributed fiber amplifiers with finite gain bandwidths are investigated by simulations with the nonlinear SchrSdinger equation. The results show that the parabolic pulse propagations in both the decreasing and the increasing gain amplifiers are restricted by the finite gain bandwidth. For a given input pulse, by choosing a small initial gain coefficient and gain variation rate, the whole gain for the pulse amplification limited by the gain bandwidth may be higher, which is helpful for the enhancement of the output linearly chirped pulse energy. Compared to the decreasing gain distributed fiber amplifier, the increasing gain distributed amplifier may be more conducive to suppress the pulse spectral broadening and increase the critical amplifier length for achieving a larger output linearly chirped pulse energy.

关 键 词：finite gain bandwidth parabolic pulse linearly chirped pulse energy 

分 类 号：TN722[电子电信—电路与系统]