基于耦合双环阵列的二维相干光码分多址编解码器

可集成、易调谐的光编解码器是光码分多址(OCDMA)系统集成化的关键模块之一。基于耦合双环阵列提出了一种新型的光编解码器。该编解码器通过调谐双环下载端反射波长以及集成于总线的相移器的相位,实现了OCDMA系统的二维相干编解码。基于耦合模理论,建立了耦合双环阵列的传输矩阵方程。用于编解码器的双环半径分别为50μm和48μm,阵列中四组双环的反射中心波长分别为1535,1535.2,1535.4,1535.6nm,信道宽度为17GHz,反射谱3dB带宽约为0.14nm,信号基本上不会出现干扰,保证了用户发送和接收信号的准确性。相应的自相关峰值旁瓣比(P/W)约为5,互相关峰值比(P/C)约为7,可以容纳用户数为96个。     

强正则图与Seidel变换

本文通过对图的Seidel变换进一步研究，得到了一些新的强正则图。     

质子交换LiNbO_3光波导

本文全面系统地综述了质子交换LiNbO3光波导的机理、结构特征和光学性质。描述了掺杂LiNbO3质子交换波导的特征 ,并与纯LiNbO3光波导进行了比较     

顺变柱体型全光纤加速度检波器

介绍了顺变柱体型全光纤加速度检波器的工作原理及结构设计，该检测器包括两个顺变柱体和一个质量块，两顺变柱体上都紧紧地绕着单模光纤，形成了迈克耳孙干涉仪的两个臂，两干涉臂的端面镀有高反铝膜，初步测试结果表明，检波器在共振频率以上有较好的频率响应，输入信号与输出信号吻合得较好。     

希土羧酸盐的结构研究——Ⅲ.[Y(n-C5H11COO)3·2H2O]2的合成和结构测定

本文合成了系列配合物Ln(n-C₅H₁₁COO)₃·2H₂O(Ln=Y,Sm,Eu,Gd,Tb,Er和Yb),并对[Y(n-C₅H₁₁COO)₃·2H₂O]₂的晶体结构进行了研究。结果表明该晶体属于单斜晶系,P2₁/α空间群。晶胞参数如下:a=8.925(6),b=14.033(5),c=19.988(6)Å;β=95.90(3)°;V=2490.3ų,Z=2.2978个独立可观察点(Ⅰ>3σ(Ⅰ))参加了结构修正,最终R因子为0.085。分子中1两个Y原子通过两个μ₂-C₅H₁₁COO桥基连结成双核配合物;每个Y还与两个双齿螯合的羧基和两个水分子成键。因此Y原子的配位数为9。对系列化合物的红外光谱也进行了研究。     

质子交换LiNbO_3光波导

本文全面系统地综述了质子交换LiNbO3光波导的机理、结构特征和光学性质。描述了掺杂LiNbO3质子交换波导的特征 ,并与纯LiNbO3光波导进行了比较     

红外吸收光谱确定质子交换LiNbO_3波导的深度

本文报道了利用红外光谱技术测量质子交换LiNbO3 光波导深度的一种新方法。该方法克服了传统的棱镜耦合技术 +IWKB方法只适用于多模波导不适用于单模波导缺点。实验结果表明该方法具有较好的准确性。     

Near-stoichiometric Ti:LiNbO3 strip waveguide with varied substrate refractive index in waveguide layer

We report the near-stoichiometric Ti:LiNbO3 strip waveguides fabricated by vapour transport equilibration (VTE) at 1060 C for 12 h and co-diffusion of 4-8 μm wide, 115-nm thick Ti-strips. Optical studies show that these waveguides are monomode at 1.5 μm and have losses of 1.3 and 1.1 dB/cm for the TM and TE modes, respectively. In the waveguide width/depth direction, the mode field follows a Gauss/Hermite-Gauss profile. A secondary ion mass spectrometry study reveals that the Ti profile follows a sum of two error functions along the width direction and a complementary error function in the depth direction. Micro-Raman analysis shows that the Li-composition in the depth direction also follows a complementary error function. The mean Li/Nb ratio in the waveguide layer is about 0.98. The inhomogeneous Li-composition profile results in a varied substrate index in the guiding layer, and the refractive index profile in the guiding layer is given.     

Proposals for Fabrication of Long-Period Grating in LiNbO3 Strip Waveguides

The structure of a strip LiNbO3 waveguide clad with a planar LiNbOa waveguide is proposed to fabricate a long-period waveguide grating （LPWG）. It is shown theoretically that an LPWG device based on such a special LiNbOa waveguide structure is of the merit of thermal stability. The methods for fabrication of planar waveguide, channel waveguide and grating are suggested and discussed. Detailed design consideration is exemplified based on a soft-proton-exchange planar waveguide clad Ti-diffused LiNbOa （Z-cut） strip waveguide.     

1/3<λ_2(G)<(5～(1/2)-1)/2图G的刻画

本文刻画了满足1／3＜λ2（G）＜（－1）／2的图G的结构．