离子交换制作0.85μm MMI光功分器的仿真研究

提出了利用离子交换技术制作多模干涉(MMI)型光功分器的设计方法.以1×8MMI光功分器为例,采用导模传输分析法分析了器件基本原理,对离子交换制作波导的折射率分布进行了讨论.针对工作波长为0.85μm的1×8MMI光功分器结构参数进行了设计,对器件输出特性、各项技术指标、离子交换决定的折射率差Δn对器件性能的影响均进行了BPM仿真,结果表明:利用离子交换方法制作MMI型光功分器,设计指标可达到均匀性约0.009dB、平均插入损耗约9.111dB和最大插入损耗约9.116dB,均优于现有器件的指标.     

1×3多模干涉型光功分器的研究

本文采用导模传输分析法,在GaAs/GaAlAs单异质结外延材料上设计了1×3MMI（多模干涉）型光功分器。根据所确定的器件结构参数,结合器件设计和制作过程中可能遇到的因素,详细分析了器件中自映像效应多模波导的宽度和长度、输入单模波导的宽度等结构参数对器件性能的影响。本文基于RSoft软件,对所设计的器件结构参量进行了仿真。模拟结果表明,所设计的器件实现了1×3光功分器功能,具有插入损耗低和均匀性好的特点。     

玻璃基光功分器的研制

本文设计并用离子交换法在BK7光学玻璃上制作了集成光学器件平面波导型光功分器,具体包括1×16级联Y分叉光功分器、1 × 8 MMI光功分器以及1×16级联MMI光功分器,并在1.55μm工作波长条件下对这些器件进行了初步测试.实验结果表明,玻璃基光功分器具有良好的器件性能,可作为实用器件投入到光通信和光信号处理系统中应用.     

二维限制多模干涉器非对称自映像特性

采用导模传输法分析了二维限制多模干涉器 (MMI)的自映像效应 ,详细讨论了二维限制MMI器件的非对称自映像性质 ,并用三维全矢量光束传输法验证了分析结果     

MMI型GaAs 1×N和N×N集成光学开关的研制

设计了一种能直接与单模光纤阵列相耦合的多模干涉 (MMI)型光开关。给出了MMI型光开关各组成部分的工作原理 ,并用导模传输分析法 ,模拟了 1× 4MMI型光开关的四种不同的开关状态 ,在此基础上完成了 1× 4和 4× 4MMI型光开关的设计。最后根据所确定的器件结构参数 ,用有限差分光束传输法分析了器件结构参数对器件性能的影响。     

多模干涉型GaAs光波分复用器的设计与研究

本文研究了一种多模干涉型光波分复用器。采用导模传输分析法,给出了该光波分复用器的工作原理,在此基础上完成了该波分复用器的设计。然后根据所确定的器件结构参数,对该器件的插入损耗和隔离度进行分析。     

InP基4×4MMI合波器的设计与仿真

采用空气限制的InP基波导,利用其弯曲半径小的优点,设计了一款紧凑型4×4 MMI(多模干涉)合波器,整个器件的尺寸为3 890 μm×100 μm.在输入/输出波导与多模干涉区域之间引入了锥形波导,有效改善了MMI合波器的性能.并通过广角三维光束传输法对器件进行了模拟仿真,得到优化参量,从而实现了其结构的优化.     

离散谱折射率法优化设计MMI型光功分器

采用离散谱折射率法直接对三维脊形自镜像效应(SIE)多模波导的模式特性进行具体分析,并根据模式传播常数偏差分布情况,引入了SIE多模波导长度微小变量用以抵消或部分减弱由各阶模式传播常数偏差引起的相位偏差,设计了一种低自镜像损耗、高均匀度、几乎与偏振无关及深刻蚀SIE多模波导结构的多模干涉(MMI)光功分器。如1×16MMI光功分器TE模的自镜像损耗为0.0451dB,均匀度0.0309dB;对TE模的自镜像损耗为0.0455dB,均匀度为0.0311dB。     

多模干涉型双波长光功分器的设计与研究

研究了一种多模干涉型双波长光功分器,该器件可同时实现1．30μm、1．55μm波长的光信号功率分配。采用导模传输分析法,给出了该光功分器的工作原理,进而完成该功分器的设计。根据所确定的器件结构参数,结合器件制作过程中可能遇到的因素,详细分析了器件结构参数对器件性能的影响。经优化设计的双波长光功分器多模波导的宽度为28μm．长度为2735μm。两波长的插入损耗分别为0．59dB和0．41dB,两波长的功率离散分别为0．16dB和0．15dB。     

基于SOI的2×2 MMI耦合器的设计

设计了一种可用于阵列波导光栅(AWG)解调集成微系统的绝缘体上硅(SOI)基2×2多模干涉(MMI)耦合器,用光束传播法(BPM)对MMI耦合器进行了模拟。耦合器输入/输出波导采用倒锥形,多模干涉区尺寸为6μm×57μm。在TE偏振中心波长为1.55μm时,器件附加损耗为0.46dB,不均匀性为0.06dB。在1.49～1.59μm波长范围内耦合器的附加损耗小于1.55dB。仿真结果表明所设计的2×2MMI耦合器体积小、附加损耗低、波长响应范围宽、分光均匀,符合片上集成系统的要求。     

GaAs 1×4光功分器的制作

本文在ＧａＡｓ／ＧａＡｌＡｓ外延材料上设计和制作了ＭＭＩ型１×４光功分器。文中首先给出器件的基本工作原理和特点,随后主要讨论器件制作中的ＧａＡｓ材料的干法刻蚀工艺,最后给出器件测试结果。     

An InP-based optical multiplexer for 100-GHz pulse-train generation

A 100-GHz optical pulse train is generated using an InP-based optical multiplexer. This device is based on a waveguide array with five paths of different lengths separated by a 10-ps propagation time. We used a multimode interference (MMI) splitter at the input and a taper-type combiner at the output. This device is well-suited for optical time-division multiplexing (OTDM) applications     

Design and fabrication of a significantly shortened multimode interference coupler for polarization splitter application

We report that we have successfully designed and fabricated a significantly shortened multimode interference coupler for application in polarization splitter, using a phenomenon that we termed "quasi-state" (QS) imaging effect. First, we identified and analyzed the QS imaging effect, and, based on the QS analysis, designed and fabricated a novel multimode interference (MMI) device with its split length shortened to 1/5 of a normally designed MMI split length. The fabrication is simple and cost effective and the fabricated device shows outstanding characteristics in extinction ratio, signal homogeneity, excess loss, and tolerance in the length of the splitter.     

Optimal design of a multi-mode interference splitter based on SOI

In this paper, the multimode waveguide lengths and the output port locations of a SOI （silicon on insulator） material-based 1×4 MMI （multimode interference） optical splitter are optimized by means of FD-BPM （finite difference - beam propagation method）. An improved 1×4 MMI optical splitter is designed. Compared with an usual optical splitter, a smaller loss 0. 12dB and a better output port power uniformity 0.11dB are achieved for the optical signal transmission.     

质子交换铌酸锂波导MMI光功分器

利用三维非旁轴近似光束传输法对退火质子交换铌酸锂渐变折射率分布波导中的自镜像效应进行分析与模拟.在此基础上,利用退火质子交换技术在X切Y传铌酸锂衬底上进一步制作了1×8 MMI光功分器.测试表明器件实现了1路分成8路的光功分功能.     

Multimode interference-based photonic crystal waveguide power splitter

A compact power splitter based on the multimode interference (MMI) effect in photonic crystal waveguides is designed and analyzed. The device size reduction compared with the conventional MMI power splitter can be attributed to the large dispersion of the photonic crystal waveguides. The Massachusetts Institute of Technology Photonic-Bands code is used to calculate the band structures of photonic crystal waveguides. The finite-difference time-domain method is adopted to simulate the relevant structures.     

Tunable multimode interference coupler

An electrically tunable multimode interference (MMI) coupler/splitter is demonstrated. The device operates by modifying the phase of the multiple self-images that are formed around the midpoint of the MMI structure. This provides a simple way to fine-tune the 50:50 output power split ratio or other arbitrary ratio.     

Analysis of generalized Mach-Zehnder interferometers forvariable-ratio power splitting and optimized switching

The nonideal integrated optical N×N generalized Mach-Zehnder interferometer (GMZI) employing multimode interference (MMI) couplers is analyzed using transfer matrix techniques. Deviations in the phase relations and the power splitting ratio of the MMI couplers are included in the theory, along with the effects of phase errors in the interferometer arms. The predictions of the theory are compared to the response of a 4×4 GMZI which has been fabricated. The device is operated as both a variable-ratio power splitter and a switch by compensating for the phase errors in the interferometer arms, but the performance is ultimately limited by the nonideal imaging in the MMI couplers. The practicality of these applications is investigated by performing a tolerance analysis for the operation of 1×N power splitters and switches for N up to 10