光电印制板的制造和特征

概述了光电印制板(O/EPCB)的制造和特征,它具有三维3D光学互连用的埋入多模步长指数(MM-SI)波导和集成不同平面微镜(IMM)。利用UV平面印刷术在PCB上积层光电路,利用倾斜曝光制造45°输入/输出I/O耦合元件。     

Determination of Optical Waveguide Refractive-Index Profiles with the Inverse Analytic Transfer Matrix Method

In this paper, we present an inverse analytic transfer matrix (IATM) method to predict the refractive index profiles from the measurement of mode indices based on the analytic transfer matrix (ATM) method, which can exactly determine the modal characteristics of a planar optical waveguide with arbitrary index profiles. IATM method has been proved to be universally reliable not only in slowly changing profiles but also the profiles changing rapidly in which inverse WKB method would find difficult through numerical analysis for several typical refractive index profiles.     

Study of refractive index and thickness of TiO2／ormosil planar waveguide

Hybrid titania/ormosil waveguide films have been prepared by sol-gel method at low thermal treatment temperature of 150℃. The influence of processing parameters including the molar ratios of Ti(OBu)_{4}/glycidoxypropyltrimethoxysilane (GLYMO) and H_{2}O/Ti(OBu)_{4} (expressed as R), especially aging of sol, on the refractive index and thickness of film was investigated. The optical properties of films were measured with Scanning Electron Microscope and m-line spectroscopy. The results indicate that the film thickness increases with the aging time of sol, but the variation of refractive index as a function of aging time of sol depends on the relative ratio of GLYMO to Ti-alkoxide. The relation between film thickness and corresponding sol viscosity is linear as the volume of GLYMO is 80% within the range of measured data.     

A Design of Magic Tee with Coplanar Arms

Magic tee is a widely used component in microwave systems; the four arms of conventional magic tee direct at four different directions, which give inconveniences to the assemblage of a system. In this paper, a broad-wall slot directional coupler and an E-plane dielectric loaded waveguide phase shifter is used to form a magic tee with four arms in the same E-plane. The magic tee is analyzed exactly with mode match method; and the simulated annealing method is used to optimize the performance of the magic tee. Simulation results are presented, which show good performance.     

Improved Composition for Sol-Gel Rare-Earth Doped Planar Waveguides

A multilayer sol-gel process has been developed in order to make highly doped rare-earth planar waveguides on silica or silicon substrates.Starting with a small range of constituents, such as SiO₂, TiO₂, P₂O₅ and Al₂O₃, we show that a large variety of gel compositions, with different spectroscopic behaviour, can be made when doped with rare-earths.We have doped the sol-gel films with neodymium and we have optimized their compositions by measuring the neodymium fluorescence lifetime. For a composition with 10 atom% of phosphorous, the lifetime evolution with neodymium concentration was studied and a quenching concentration was found at 1% of neodymium. We have also shown the strong influence of phosphorous or aluminium in the sol composition on the fluorescence lifetime, for a given neodymium concentration. First results on similar planar waveguides, doped with erbium, are also presented.The stability of the fluorescence lifetime over a long period of time is an other important point to be checked for these new materials: the lifetime evolution over a 9 months measurement period is presented.     

Design of flat-field arrayed waveguide grating with three stigmatic points

A new-type flat-field arrayed waveguide grating (AWG), with the focal signals of all wavelengths of operation focusing along a straight line, has been designed. The work bases on the aberration theory of AWG, in which the restraints imposed on the conventional Rowland-type AWG have been released. In the design of flat-field AWG, three stigmatic points restrain three dominant geometry parameters: geometry of star couplers, ports distribution of phased-array, and length increment between adjacent paths. An eight-channel 200-GHz spacing flat-field AWG has been designed and simulated. As stigmatic points introduced, the aberration of this device is much lower than that of the Rowland-type AWG.     

硅基光导波结构的特性研究

研究了在硅基底上采用等离子增强化学汽相淀积（ＰＥＣＶＤ）氮氧化硅（ＳｉＯＮ）所形成的包括通道波导、条汉志、倒脊型波导等多种结构的特性，通过对测试结果进一步分析，总结出有关结论并提出一些改进方法。     

指数型光波导的近似解析法

本文用一级微扰理论，对指数型折射率分布光波导，进行了波方程的解析求解，推得用Ａｉｒｙ函数表示的场解和色散方程。用一级近似计算了传播常数（β／ｋ）ｍ，与Ｃｏｎｗｅｌｌ的精确计算相比较，其结果也是好的。     

各向同性手征媒质均匀填充手征波导中的耦合波方程

本文从麦氏方程组和手征媒质的本构关系出发，运用耦合波理论，对各向同性手征媒质均匀填充的手征波导中存在的耦合孪生模式的电场和磁场矢量进行了推导并得到耦合波方程组的一般表达式，同时指出了在弱耦合近似条件下，应用微扰原理求解耦合波方程组的一般思路，为从耦合波的观点来分析手征波导中的各种不连续问题提供了一条新的理论途径。     

利用集成光学技术的新型时间脉冲整形系统

通过对时间脉冲整形技术的探索，发展了一套准备应用于未来高功率激光装置的激光脉冲整形系统。在这套整形系统中，使用了通光波长1．053μm的质子交换型波导调制器。通过这套利用集成光学调制技术的整形系统，得到了脉冲起伏小于10％的整形方波光脉冲。