4 . the lpfgs are used in single wavelength er - doped fiber amplifiers ( edfas ) as a spontaneous emission noise ( ase ) filter , and the gain of the edfa is increased by 7db and the noise figure ( nf ) is decreased by 0 . 5db , for the first time 4 、成功研制了掺铒光纤放大器,首次将高频co2激光脉冲写入的长周期光纤光栅应用到掺铒光纤放大器中作为自发辐射噪声滤波器,使edfa的增益提高了7db 、噪声系数降低了0 . 5db 。
3 . investigated the direct model construction method of unsteady aerodynamics state space equation from volterra kernels , including linear state space model and bilinear state space model . the general model construction method for ase was brought forward 研究了基于volterra核直接建立非定常气动力状态空间模型的方法，包括线性状态空间模型和双线性状态空间模型，并提出了将其用于ase系统建模的一般方法。
Results revealed that there are strong interactions between spreading molecules and pei soft cushion , and pei ' s existing made the microstructure of the monolayers very different from that of the films deposited from pure water subph ase , and surface patterned topography formed 结果发现成膜分子与软垫之间存在着强烈的相互作用， pei的存在使得单分子膜的存在状态与纯水亚相上的单分子膜相比发生了很大的变化，形成了图案化的拓扑结构。
The average gain and nf are 22 . 22db and 8 . 69db respectively . gain flatness under single and double lasers control are 0 . 69db and 1 . 51db . a gain - clamped dual - stage l - band edfa by utilizing backward c - band ase as control light is presented for the first time 2 .我们还提出了一种优化反射式edfa噪声性能的方案,通过利用高双折射环镜代替普通光纤环镜来抑制铒纤的前向ase ,双通放大器在1580 . 84nm ~ 1588 . 48nm范围内的平均噪声系数减少了3 . 7db 。
