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 。
Three shaped profiles ( parabola , linear , and exponential ) have been considered . the exponential dispersion profile fiber loop is optimal for the propagation and compression of picosecond pulse . on the contrary , the parabola dispersion profile fiber loop is optimal for femtosecond pulse due to the high order effects such as the third order dispersion ( tod ) , stimulated raman scattering ( srs ) and self steeping ( ss ) ( 3 )研究不同色散递减类型(抛物线递减、线性递减、指数递减)光纤构成的环形腔中传输的特性，发现其色散曲线为指数递减型光纤有利于皮秒光脉冲的传输与压缩；而对于飞秒脉冲，由于三阶色散( tod ) 、脉冲拉曼自散射( srs )及自变陡( ss )等高阶非线性效应的影响，情况恰恰相反；色散曲线为抛物线递减型的光纤构成的光纤环最有利于脉冲传输与压缩。
Applying two perpendicular polarized light states and a no - light state to express information , this new theoretical system covers : a ) whole architecture constructed from light processing , light transmission , electric control and photoelectric input and output ; b ) various computing units mainly consist of liquid crystal element and polarimeter ; c ) light bus mainly consists of interlinkage optic valves ; d ) ternary memory formed from semiconductor memory ; e ) register formed from optic fiber ring ; and i ) huge - numeral management based on the new concept of calculating path and calculating channel 这个理论包括：光处理、光传送、电控制、综合输入输出的总体结构；以液晶元件和偏振器为主的各类运算器结构；以互连光阀为主的光空间总线；以半导体存储器为主的三值数据存储器结构；以光纤环为主的寄存器结构；以算位、算道新概念为基础的巨位数管理方案等。
We have demonstrated a novel voa based on high birefringence fiber loop mirror , which has many advantageous characteristics such as a simple structure , high flexibility , polarization independence , low insertion loss and low price , etc . experimental proof shows that it is convenient to realize the control of optical power by using this voa 2 .利用双折射光纤环镜设计并制作了一个结构简单的可调谐光纤衰减器,具有灵敏度高,偏振无关,低插入损耗和低成本等特性。实验证明它可以很方便的控制光功率。 3 .提出了一种由布拉格光纤光栅和高双折射光纤环镜共同构成波长选择器件的掺铒光纤激光器。
In this paper , the polarization in the fiber - optic depolarized gyros has been analyzed . several aspects are under discussion , such as the polarization evolution in the depolarizer and the single - mode fiber sensing coil , the depolarization in the polarization - maintain fiber , the birefringence and coupling in the single - mode fiber , the nonreciprocal phase error and the output intensity . firstly , the depolarization effect of the lyot depolarizer to the polarized light and the partially polarized light has been analyzed 本文对消偏光纤陀螺中的偏振特性进行了分析，包括单模光纤环和消偏器中的偏振态演变、保偏光纤的消偏性能、单模光纤环的双折射和耦合、输出光强和非互易性相位误差与偏振态的关系。
