1967～2033 nm波段硅基可调谐外腔半导体激光器设计与仿真

2μm波长附近可调谐半导体激光器在分子光谱学和光通信领域中有广阔的应用前景。基于绝缘体上硅（SOI）平台,对2μm波长附近可调谐半导体激光器的外腔部分进行了设计优化。分析了不同尺寸光波导的模式损耗特性、单个微环谐振腔受总线波导耦合间距的作用以及总线波导光反馈终端对外腔半导体激光器性能的影响。并提出了一种具有高工艺兼容度的多模环形光波导光反馈结构。所设计的可调谐半导体激光器硅基外腔可通过环形波导上的镍铬合金微加热器进行0.1 nm/K的高精度调谐,对单个微加热器施加3.2 V电压时,调谐范围可达66 nm(1967～2033 nm)。     

热光效应的微流体光波导结构分析

提出了一种基于微流控芯片由热光效应引起的微流体光波导结构。光波导芯层及覆层材料均为微通道中同种不同温度的液体。在微通道的上下面分别设计金属铜电极,在电极两端施加电压,对通道内液体加热。通过液体热传导,使得接近沟道壁边缘层与沟道中间层之间产生由高到低的温度分布。根据液体热光效应,液体在不同温度下折射率不同,沿着通道壁边缘层到通道中间层之间折射率由低到高,实现折射率渐变型平面光波导。电极两端所施加的电压大小及加热时间长短控制微沟道内温度高低,温度的高低决定了液体折射率分布,从而调节光波导实现单/多模传输。这种可调谐光波导结构可望在微流控光学器件中得到应用。     

高品质因子聚合物可重构微环谐振腔滤波器

以聚合物ZPU-44和聚砜(PSU,polysulfone risi n)分别作为波导包层和芯层材料,采用倒脊形波导结构,设计并 优化了聚合物可重构微环谐振腔滤波器的波导截面参数、弯曲半径、耦合区波导长度和间距 以及调谐电极 等结构参数,分析了其谐振滤波特性。采用传统的微加工工艺制备了聚合物可重构微环谐振 腔滤波器并进 行了测试。结果表明,其在通信波段1550nm附 近的自由光谱范围(FSR)为0.15nm,3dB带宽约为0.0235nm, 品质因子Q达6.60×10⁴,在0~ 4V电压范围内实现了0.5~12.95dB消光比的调谐,且 谐振波长调谐一 个FSR的电压为4.75V,与理论设计基本 相 符。本文的聚合物可重构微环谐振腔滤波器可用于集成波导可调谐光延时线和可调谐滤波。     

玻璃基片上双层多模光波导的制备

在光学玻璃基片上制作了双层掩埋式多模光波导芯片,这种芯片中的上、下两层光波导均通过熔盐离子交换和电场辅助离子迁移形成。对光波导的横截面以及输出光斑进行了观察,并进行了损耗和串扰测试。研究结果表明:双层多模光波导芯片中上、下两层光波导芯部横截面尺寸分别为29 m19 m和31 m20 m;两层波导的输出光斑尺寸相互匹配;两层波导传输损耗分别为1.000.32 dB/cm和0.780.35 dB/cm;两层光波导之间的串扰在17.7dB左右。这种玻璃基片上的双层多模光波导可以使板级光互连的互连密度增大一倍,提高EOCB的性能。     

多功能2×2 GaAs/GaAlAs多模干涉型光开关分析

提出了一种基于深刻蚀脊形光波导带模斑转换器的多功能2×2 GaAs/GaAlAs多模干涉型光开关,并用变量变换级数展开法及三维有限差分束传播法对其进行了模拟分析与优化设计.结果表明,通过控制多模波导中央的两段Schottky电极,器件可实现交叉态、直通态及3dB耦合器功能,并有较大的制作容差、较宽的工作带宽,只须一个多模波导,器件结构紧凑.采用深刻蚀脊形光波导能够满足多模干涉型器件的精确自镜像要求,并使输入/输出光波导在单模工作下有较大的横截面,较低的弯曲损耗及较小的耦合串扰.通道末端引入的模斑转换器可方便地与单模光纤连接耦合.     

一种新型光波导及其在光衰耗器中的应用

本文介绍一种能用于可调谐光衰耗器的新型光波导,其包层为金属汞,包层长度灵活可变。理论分析和实验均表明,这种光波导的光功率衰耗与包层长度成正比,在１．３μｍ光波长,当芯径为４００～６２μｍ时,应对光功率的衰减为０．０４～０．１６ｄＢ／ｍｍ,。以此光波导为基础的可调谐光衰耗器具有结构简单、性能优越等特点,其测量精度可达０．３ｄＢ。     

交叉多模光波导传输特性分析

针对交叉多模光波导结构,基于光束传输法(Beam Propagation Method,BPM)对其传输特性进行了分析,通过对方形多模光波导模式Ep,qx的分析发现,对于相同的模式序数p,随着传输模式阶数q的增加,交叉光波导的传输特性基本保持不变;随着模式序数p的增加,小的交叉角度更易引起交叉光波导的相互干扰。     

超紧凑型SOI基3×3MMI波导光开关的优化设计

提出一种基于SOI材料的超紧凑型3×3 MMI波导光开关,开关仅有一个多模波导,且多模波导采用更为紧凑的双曲结构.用FD-BPM方法对其各个状态进行了模拟和分析,并对器件的结构参数进行了优化设计.结果表明,这种光开关可以成功实现任意两输入和输出通道间的开关功能,优化后的开关呈现优良的综合性能,且整个器件的尺寸小于4mm.     

一种带有锥形多模过渡区的Y分支光波导

为减小Y分支波导的分支损耗,提出在输入波导和两输出波导间引入锥形多模过渡波导.与已被用于减小Y分支波导分支损耗的矩形多模过渡波导相比,所引入的锥形多模过渡波导,不仅可以减小过渡波导的长度,还可进一步减小分支损耗.利用三维有限差分光束传播法,对具有锥形过渡波导的退火质子交换铌酸锂Y分支光波导进行了数值模拟.数值结果为该类Y分支光波导的设计和制备提供参考.     

有机聚合物光波导制作工艺综述

有机聚合物光波导光互连已成为实现短距离计算通信设计目标的最佳解决方法。短距离光互连是未来互连方向,综合性能优良的聚合物多模光波导是光互连中的重要组成部分。有机聚合物光波导的制作工艺对光波导的性能具有重要影响,故此对有机聚合物光波导的制作工艺进行了综述,并提出了一些未来的研发方向。     

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.     

基于光子晶体多模波导的1．31／1．55μm双波长功分器的设计

设计了一种基于光子晶体多模波导的双波长光功分器,该器件能同时实现1.31 μm和1.55μm两种通信波长的光信号功率的平均分配,整个器件长度仅为15μm,是已报道的常规结构的182分之一.根据导模传输法,讨论了对称入射时光子晶体多模波导中的自映像效应,采用时域有限差分法模拟了光场在波导中的分布,入射场的单重像和二重像交替在波导中周期性地出现.并讨论了功分器的输出效率,及输出效率随位于单模波导与多模波导联结处的介电柱位置变化而产生的变化.     

Spatial power splitting and combining based on the Talbot effect

The Talbot effect, a multimode interference phenomenon, is investigated as a technique for combining power from solid-state devices in order to generate higher levels of microwave and millimeter-wave power in a process referred to as quasioptical or spatial power combining. We explore the feasibility of using the Talbot effect to implement a 1 × 8 power splitter and an 8 × 1 power combiner at 94 GHz. We report the first demonstration of the multimode interface phenomenon in a planar waveguide at 8 GHz     

Design of novel power splitters by directional coupling between photonic crystal waveguides

The design of a novel photonic crystal waveguide power splitter is presented. The proposed power splitter has three output ports, the coupling among three parallel photonic crystal waveguides can be considered as a multimode interference (MMI), and the positions of output waveguides are determined by those of twofold images which are formed by the self-imaging effect of multimode interference. The transmission characteristics of the splitter are investigated by using the finite-difference time domain (FDTD) and the plane wave expansion method. The output optical power in each port can be controlled by adjusting the radius of the dielectric rods in the coupling region, and the coupling effect among output ports is decreased by using the T-shaped output port. The results indicate that 1× 1, 1×2 and 1×3 type power splitters can be realized when the normalized radius of dielectric rods in the coupling region is 0.130, 0.180, 0.152 or 0.221, respectively.     

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。     

A 12-channel phased-array wavelength multiplexer with multimodeinterference couplers

A compact 12-channel phased-array wavelength-division multiplexer based on multimode interference (MMI) couplers and useful for application with multiwavelength lasers is proposed. A suitably-chosen 1×12 MMI nonuniform power splitter is used to suppress the sidelobes of the multiplexer spectral response. Simulated results for the multiplexer designed in an InP-InGaAsP rib waveguide system and with 1-nm channel spacing at a wavelength of 1550 nm are presented. The multiplexer has a length of 3.2 mm and an insertion loss of 1.7 dB     

Theoretical investigation of ultrasmall polarization-insensitive 1/spl times/2 multimode interference waveguides based on sandwiched structures

A polarization-insensitive 1/spl times/2 multimode interference beam splitter based on sandwiched structures is proposed and investigated theoretically for the components of ultrasmall optical integrated circuits. Strong polarization dependencies arising in Si-wire waveguide systems are compensated by introducing sandwiched structures.     

光子晶体波导定向耦合光功分器的设计与优化

基于波导定向耦合原理设计了一种全新的光子晶体波导定向耦合光功分器.采用时域有限差分法对这种器件的光波传输特性进行了数值分析,结果表明:本征模色散曲线之间相交;器件的尺寸比传统光功分器更小;入射到光功分器的能量平均分配到输出端,且光波透射率高达95%.这些优异特性对于制造大带宽、高透射率和结构紧凑的光电器件具有极大的应用价值.     

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     

A novel 1*8 optical power splitter using tapered waveguide coupling

The performance of a novel 1*8 optical power splitter is demonstrated. Consisting of seven three-guide power couplers connected in a cascade manner, the splitter has a relatively short length of 11 mm. The use of a tapered waveguide in the constituent couplers should make it possible for this power splitter to provide a wide bandwidth and little polarization dependence. Also it has the advantage of strong tolerance to the waveguide parameter deviation.<>