GaAs／GaAlAs脊型波导交变式△β耦合器

研制了具有肖特基势垒电极的ＧａＡｓ／ＧａＡｌＡｓ双异质结脊型波导交变式△β耦合器。通过合理设计器件结构，降低波导层中载流子浓度和上、下包层中Ａｌ的含量，以及采用反应离子刻蚀和和剥离等技术，使器件总损耗降为１０ｄＢ，消光比为２６．８ｄＢ，器件在１．３μｍ下实现单模工作。     

GaAs1×4Mach－Zehnder型光开关列阵研究

采用非对称Ｘ结耦合器设计并研制了ＧａＡｓ１×４Ｍａｃｈ－Ｚｅｈｎｄｅｒ型光开关列阵。简述了非对称Ｘ结和相应的光开关列阵的工作原理及器件的设计和制作过程。在波长为１．１５μｍ的光波下测量单元器件，得到了小于－２０ｄＢ的串音和小于１２Ｖ的开关电压，器件的光波导传输损耗约为７ｄＢ／ｃｍ。文中最后分析了导致器件中串音和损耗的各因素，并提出了可能的改进方法     

GaAs／GaAlAs定向耦合器型行波调制器II.实验

在理论分析设计的基础上，进行了ＧａＡｓ／ＧａＡｌＡｓ定向耦合器型波调制器试验，建立了器件行波电极微波特性的测试系统，由此系统进行实验确定器件最佳结构参数，完成器件的制作，器件采用共平面波电极，击穿电压２８Ｖ。用１．０６μｍＹＡＧ激光器进行测试，开关电压８．５Ｖ。由微波网络分析仪测试器件行波电极的微波特性，测得电极中微波与波导中光波间的速率失配小于３％，且在３０ＧＨｚ下，微波传输损耗小于３０ｄＢ表明     

GaAs／GaAlAs定向耦合器型行波调制器：1.设计

从理论上重点分析和研究了器件行波电极的微波特性，在半绝缘ＧａＡｓ衬底上设计了具有ｎ＾＋重掺杂外延层和共平面电极的ＧａＡｓ／ＧａＡｌＡｓ定向耦合器型行波调制器，针对实验中发现的行波电极上微波的高传输损耗问题。分析了起因并提出了器件的改进设计方案，从而设计出可达到３５ＧＨｚ带宽的高速调制效应的光波导调制器。     

GaAs／GaAlAs脊型波导交变式Δβ耦合器

研制了具有肖特基势垒电极的ＧａＡｓ／ＧａＡｌＡｓ双异质结脊型波导交变式Δβ耦合器．通过合理设计器件结构，降低波导层中载流子浓度和上、下包层中Ａｌ的含量，以及采用反应离子刻蚀和剥离等技术，使器件总损耗降为１０ｄＢ，消光比为２６．８ｄＢ，器件在１．３μｍ下实现单模工作．     

GaAs/GaAlAs定向耦合器型行波调制器Ⅱ.实验

在理论分析设计的基础上，进行了ＧａＡｓ／ＧａＡｌＡｓ定向耦合器型行波调制器实验。建立了器件行波电极微波特性的测试系统，由此系统进行实验确定器件最佳结构参数，完成器件的制作。器件采用共平面行波电极，击穿电压２８Ｖ。用１．０６μｍＹＡＧ激光器进行测试，开关电压８．５Ｖ。由微波网络分析仪测试器件行波电极的微波特性，测得电极中微波与波导中光波间的速率失配小于３％，且在３０ＧＨｚ下，微波传输损耗小于３０ｄＢ，表明器件的３ｄＢ调制带宽超过３２ＧＨｚ     

GaAs中的离子注入技术

在ＧａＡｓ集成电路和器件研制中，离子注入是关键技术之一．介绍了用离子注入ＧａＡｓ形成ｎ型和ｐ型区，以及离子注入ｐ型和ｎ型ＧａＡｓ形成绝缘层、形成ｎ＋ＧａＡｓ深埋层等重要技术．对有关物理机制进行了讨论并提出了一些新见解；该离子注入新工艺已经应用于ＧａＡｓ器件和集成电路的研制，获得了多种新型器件． Optical and electrical properties of Si GaAs wafers implanted with Si+, S+, Be+, Mg+, B+, O+ have been investigated in this paper.     

15GHz马赫－陈德尔型Ti：LiNbO_3行波幅度电光调制器

比较了四种马赫－陈德尔调制器的结构特性，表明Ｚ切共面波导（ＣＰＷ）是最好的一种结构。用阶跃倒相电极设计了新型电光光波导幅度调制器，研制了包装式带尾光纤的有５段例相电极的马赫－陈德尔调制器。在１．５３２μｍ波长上，该器件调制带宽为１４．８ＧＨｚ，半波电压为１４Ｖ，消光比为２１．３ｄＢ，光纤－器件－光纤插入损耗７．６ｄＢ。     

集成光学TM模偏振器的制作

用扩钛和质子交换相结合的方法在ｘ切ｙ传ＬｉＢｎＯ３衬底上制成了ＴＭ模集成光波导偏振器。质子交换区位于扩钛波导的末端两侧。在质子交换区域Δｎｅ〉０，Δｎ０〈０，因此ＴＥ模辐射进入衬底。偏振器工作于１．３μｍ波长，消光比优于４７ｄＢ，光纤０－波导－光纤插入损耗３．５ｄＢ。     

GaAs／GaAlAs多量子阱反射型光调制器及自电光效应器件

采用分子束外延技术生长含有大周期数的ＧａＡｓ／ＧａＡｌＡｓ多量子阶（ＭＱＷ）及分布布喇格反射器（ＤＢＲ）的ＰＩＮ结构器件。研究了量子限制斯塔克效应（ＱＣＳＥ），分布布喇格反射及非对称腔模（ＡＳＦＰ）效应对光的反射调制作用及这三种效应的兼容性对光调制及逻辑器件的重要影响。给出我们研制的反射型光调制器及自电光效应器件的实验结果。对于常通型及常闭型调制器，其两态衬比度可达１０ｄＢ。所研制的ＳＥＥＤ器件，其导通光能耗低于１０ｆＪ／（μｍ）￣２，实现其光学双稳态及Ｒ－Ｓ光触发器工作。     

Acrylic-based asymmetric and variable coupling ratio Y-branch plastic optical fiber coupler

Acrylic-based asymmetric and variable couplers have been developed using a single structured Y-branch design with a high-index-contrast waveguide taper and a void structure for fiber attenuation using the lateral displacement of two fibers. Device fabrication is performed by producing the device structure on an acrylic block using a computer numerical control (CNC) machine tool. The fabricated device has an excess loss of 5.85 dB, while the coupling ratios are 56.86 and 43.14% when the device is operated as a 3 dB coupler. In the asymmetric coupler mode, the coupling ratio ranges from 44.84 to 8.01% for port 1 and 55.16 to 91.99% for port 2. The excess loss of this device varies from 5.42 to 7.64 dB. In the variable coupler mode, the coupling ratio ranges from 10.09 to 32.88% for port 1 and from 89.91 to 67.12% for port 2. The excess loss of the device varies from 5.85 to 8.49 dB.     

Optical Code Generating Device Using 1×N Asymmetric Hollow Waveguide Couplers

An optical code generating device for security access system application is presented. The code generating device constructed using asymmetric hollow optical waveguide coupler design provides a unique series of output light intensities which are successively used as an optical code. The design of the waveguide is made using two major components which are asymmetric Yjunction splitter and a linear taper. Waveguiding is done using a hollow waveguide structure. Construction of higher level 1×N hollow waveguide coupler is done utilizing a basic 1×2 asymmetric waveguide coupler design together with a cascaded design scheme. Nonsequential ray tracing of the asymmetric hollow optical waveguide couplers is performed to predict the optical transmission properties of the waveguide. A representation of the code combination that can be generated from the device is obtained using combinatory number theory.     

Demonstration of a mode-conversion cavity add-drop filter

We experimentally demonstrate a new type of add-drop filter incorporating an asymmetric Y-branch waveguide coupler and a shifted-grating mode-conversion cavity. The device relies on mode separation in the asymmetric Y-branch and wavelength-selective mode conversion upon reflection from the shifted-grating cavity. Add-drop functionality is demonstrated in a three-port integrated silicon-on-insulator device.     

熔锥型宽带耦合器的研制

介绍了全光纤熔融拉锥型3dB宽带耦合器的理论设计，根据理论设计制作了样品。应用耦合模理论分析了全光纤非对称熔融拉锥型耦合器的宽带特性；提出了3dB宽带耦合器的制作方案，在此基础上制作了样品；对样品进行测试，样品带宽大约为300nm(在1300nm～1600nm波长之间)，附加损耗小于0.5dB，完全达到了实用化的要求。     

SOI通道转换型多模干涉耦合器的研究

设计和制作了基于SOI的通道转换型多模干涉耦合器。用二维BPM方法分析了耦合器的性能与多模波导宽度和长度的依赖关系.制作出的耦合器能实现良好的通道转换,器件的功率转换比为73,附加损耗为2.2 dB.提高器件制作的精度将能进一步改善耦合器的性能.     

Design and fabrication of compact 3-dB coupler in silicon-on-insulator

A novel compact 3-dB coupler is proposed and fabricated in silicon-on-insulator. The new coupler provides large output waveguide spacing of 125.0 μm with short device length of 867.0 μm and large cross-section of 6.0 × 4.0 μm. The device length can be remained essentially unchanged even when the output spacing is further enlarged to realize the complex applications in photonic integrated circuits. The fabricated device exhibits excess loss of 6.3 dB and low imbalance of 0.26 dB.     

A dual-channel wavelength multiplexer / demultiplexer based on the restricted-resonance self-imaging effect

The authors propose a high-performance 980 / 1550-nm wavelength multiplexer / demultiplexer based on the restricted-resonance self-imaging effect in a buried-type waveguide system. The device functions either as a multiplexer or a demultiplexer, depending upon the direction of light propagation. Using the modal propagation analysis (MPA), characteristics of the device are investigated. We carried out the design of the device and showed that the device performance can be optimized by appreciate selection of the coupler width. A demultiplexer with an insertion loss of 0.4 dB and contrast of 25.5 dB at wavelength 1550 nm and 32 dB at 980 nm is demonstrated.     

跑道形玻璃波导谐振腔滤波器的研制

采用Ag+-Na+离子工艺,在K9玻璃上制备了跑道形波导谐振腔滤波器.测试得到该滤波器自由光谱范围为FSR=0.177 nm,对比对为Cr＝7.5 dB.同时分析得到耦合器的耦合系数为κ=0.916,耦合器和环形腔的损耗因子分别为δ=0.55,γ=0.48.耦合器的两波导几乎相连、条波导边缘不规则和一次离子交换波导表面缺陷是造成该波导滤波器具有较大损耗的主要原因.通过改进工艺技术降低波导损耗,该滤波器可以用于光通信、传感等领域,也可与其它波导结构相结合实现新的功能.