A waveguide polarizer based on Si-coated Ti:LiNbO_3 planar structure

A novel design of a transverse magnetic (TM)-pass waveguide polarizer based on Si on an X-cut, Y-propagatiou Ti:LiNbO3 planar waveguide is presented. The eigenvalue functions of such structure have been obtained by using Wenzel-Kramers-Brillouin (WKB) method with modified Airy functions. The intervals of the silicon thickness have been found which result in transverse electric (TE) light suffering strong attenuation while TM wave propagating with fairly low loss. A planar waveguide polarizer is fabricated and its polarization-dependent measurements lead to the best polarization extinction ratio ~ 34 dB and the insertion loss < 0.4 dB.     

1477 nm LD泵浦掺铒光纤放大器的研究

报道了采用１４７７ｎｍ激光二极管（ＬＤ）泵浦的掺铒光纤放大器的实验结果。研究了放大器的增益和时域特性。对１５２０ｎｍ的信号光，获得了２３ｄＢ的增益，泵浦效率为２．２８ｄＢ／ｍＷ。低频脉冲信号经过放大器后未发生波形畸变。     

利用相位共轭技术补偿光纤中色散效应的条件

利用相位共轭器的频率反转特性的,补偿光纤中的色散效应,在理论上和实验上得到了证明.由色散脉冲的傅里叶交换确定了光纤中二次色散效应可以被忽略的条件,得到了共轭器的反射率和带宽与非线性介质的长度L,参数|K|L之间的关系曲线,找到了影响补偿效果的主要因素.     

A Powerful Simple Shooting Method for Designing Multi-Pumped Fibre Raman Amplifiers

A simple shooting method dedicated to the design of multipump discrete Raman fibre amplifiers (RFAs) ispro posed and discussed in detail. A novel scheme to provide a good initial guess for backward lightwaves is also proposed to improve the efficiency and robustness of the method. Using the proposed method, a discrete RFA with four backward pumps and 93 signal channels is simulated for the maximum number of interaction waves considered simultaneously in the RFA design reported previously; to our best knowledge. The numerical simulation results show that the proposed method is fast and robust. It can be used in the design of RFAs with various configurations including co-, counter- and bi-directJonal-pump schemes to provide an actual modelling.     

脉冲激光泵浦的钛宝石激光器

本文主要从理论和实验上研究了脉冲钛宝石激光器的输出特性     

高功率准连续激光二极管抽运的Nd：YVO4激光器

对高功率准连续激光二极管端面抽运的Nd:YVO4固体激光器进行了实验研究。研究了抽运功率、温度、重复率及输出镜的透过率对激光器输出功率的影响。当激光二极管重复率达到720Hz、抽动功率33.2W时,激光输出最大平均功率为11W。     

高功率脉冲Er-Yb共掺光纤放大器中放大自发辐射的抑制方法

为了研究放大的自发辐射(ASE)对高功率脉冲Er-Yb共掺光纤放大器(EYDFA)的影响,采用数值模拟对EYDFA中不同参数信号的放大进行了研究。结果表明,Yb波段(1.0～1.1μm)ASE是制约放大器输出功率提升的主要因素。因此,有效地抑制Yb波段ASE将有助于放大器性能的提高。通过进一步研究发现,在放大器的抽运端引入一个Yb波段的辅助信号能有效地抑制Yb波段ASE,从而提高抽运转换效率,提升放大器的输出功率。     

脉冲泵浦双包层掺Yb3+光纤放大器理论研究

对比研究了在连续泵浦和脉冲泵浦两种情况下,高功率双包层掺Yb3+件光纤放大器的输出特性.计算结果表明:采用脉冲泵浦放大50 kHz高斯脉冲信号,在ASE光抑制方面和光纤放大器热效应方面都优于连续泵浦情况下的光纤放大器.进一步又研究了脉冲泵浦下,从泵浦脉冲峰值功率,掺杂光纤浓度和泵浦波长三方面选择泵浦脉冲宽度,优化放大器输出特性.为提高和设计掺Yb3+抖光纤放大器和MOPA系统的输出功率和稳定性提供了理论依据.