Ge0.05Si0.95/Si脊形光波导的分析及设计

提出了Ｇｅ０ ．０５Ｓｉ０ ．９５／Ｓｉ 脊形光波导的等效模型,并在此模型的基础上利用有效折射率的数值解法计算出Ｇｅ０ ．０５Ｓｉ０ ．９５／Ｓｉ 脊形光波导的有效折射率,从而为脊形光波导的设计提供了重要依据     

Ge0.05Si0.9／Si脊形光波导的光场分析及设计

利用有效折射率法分析了Ｇｅ０．０５Ｓｉ０．９５／Ｓｉ脊形光波导的光场分布，得到了这种光波导在传输单模时内脊高ｂ，外脊高ｈ和脊宽Ｗ的合理取值，还为其它光波导器件的设计奠定了基础。     

Ge_(0.05)Si_(0.95)/Si脊形光波导的光场分析及设计

利用有效折射率法分析了Ge0.05Si0.95／Si脊形光波导的光场分布，得到了这种光波导在传输单模时内脊高b、外脊高h和脊宽W的合理取值，还为其它光波导器件的设计奠定了基础。     

硅单模脊形光波导的三维模拟及实测结果

对当前硅光集成技术的热点、制备大断面低传播损耗单模脊形光波导进行了三维理论模拟设计。脊的上覆盖层是空气（大折射率台阶，非对称情况）或纯硅层（对称情况），均能得到符合实际的模拟结果。改变脊形光波导的高宽几何尺寸或折射率分布值，模拟结果呈现单模、双模或更高阶模的电场分布及光强分布。用相应条件指导硅脊形光波导的实际制备，实测结果表明模拟结果是准确的。     

PMMA脊形光波导的设计与场分析

利用有效折射率法（EIM）理论设计了有机聚合物脊形光波导结构,并分析光波导中传输的模式场,确定出光波导结构的适宜尺寸范围。光波导结构中分别选用PMMA（聚甲基丙烯酸甲酯）与PDMS（聚二甲基硅氧烷）作为波导层与包层的材料,用光漂白法来实现脊形波导结构。首先利用EIM法分析脊形波导区的宽度与高度之间的关系对归一化色散曲线的影响,以及波导层与包层的折射率匹配的影响,然后又通过分析波导区传输的基模场来讨论传输的损耗问题。研究发现波导结构的脊宽与脊高之比w／d越大,其有效折射率neff越大,而此结构尺寸又需约束在一定范围内,否则将造成很大的传输损耗。     

全硅大断面脊形光波导传播特性的理论分析及实验结果

对当前硅光集成的研究焦点－制备大断面单模脊形光波导的单模条件，用有效折射率法进行分析，也计算了传播常数等性能参数。结果表明，有效折射率法有方法简明、结论确切的优点。它能同时给出单模区、多模区及截止区的条件，已有效指导了ＳＩＭＯＸ及ｎ／ｎ＋外延型两种单模脊形硅光波导的制备。文中最后给出了实验结果。     

用有效折射率／有限元法分析脊形光波导及其方向耦合器特性

本文应用有效折射率／有限元法（ＥＩ－ＦＥＭ），计算和分析了半导体（量子阱）脊形光波导的模式特性、模式场分布及其变化规律．检验了ＥＩ－ＦＥＭ的精度，分析了其产生误差的原因．扩展了ＥＩ－ＦＥＭ，将其用于求解耦合波导系统，确定了方向耦合器的耦合特性及其变化规律．     

SOI矩形光波导的有效折射率方法的研究

通过分析有效折射率方法在计算SOI矩形光波导中的误差，得出了从矩形波导的短边和长边分别计算波导的参数是不相同的结论，对于利用修正的有效折射率法求解波导参数有指导意义。     

硅 SIMOX 单模脊形光波导研制

本文描述硅光波导技术的重大突破：（１）用ＳＩＭＯＸ技术代替传统的硅外延型光波导，解决了衬底吸收光波．从而显著改善了光波导的传播损耗．（２）在理论及实验上均已解决用调整脊形的高宽比（高宽均能达１０微米左右），制取单模脊形光波导．这种光波导的下覆盖层是ＳｉＯ２，传播损耗小；断面积大，和单模光纤耦合良好．满足了光集成技术中对光波导的几项重要要求．     

单模GexSi1—x脊形光波导的研制

通过分析和计算，得到了单模ＧｅｘＳｉ１－ｘ脊形光波导内脊高、脊宽和腐蚀满足的关系。实践证明，按照这些关系可以成功设计制作 单模ＧｅｘＳｉ１－ｘ脊形光波导。     

Polarization rotation in periodic loaded rib waveguides

Polarization rotation in an asymmetric periodic loaded rib waveguide is analyzed by a scalar coupled-mode theory with vector correction. The scalar modes of the dielectric loaded rib waveguide are calculated by using a simple variational method. The polarization rotation is found to be caused by a geometric effect due to the asymmetric loading of the waveguide. By phase-matching the two polarized modes through the periodic loading, complete polarization rotation can be achieved     

The design of triple rib waveguide couplers by the discretespectral index method

The operations of three-guide couplers are usually controlled by the width and refractive index of the guides. However, when rib waveguides are used in three-guide couplers and power dividers, we propose to use the dimensions of the ribs as the governing parameters instead. Formulating a new transcendental equation using the discrete spectral index (DSI) method, triple rib waveguide couplers are accurately analyzed for the first time. The new accurate and fast analysis of triple rib waveguides shows that the propagation constants of the various modes are dominantly controlled by the height of the middle rib. A systematic and simple procedure is consequently introduced to design quasi-transverse electric (TE) polarized triple rib waveguide couplers, which ensures maximum power transfer from one outermost guide to the other outermost guide. For triple rib power dividers, the height of the middle rib is found to control the amount of power that can be transferred from the excited middle rib waveguide to the two outer rib waveguides. Maximum power division is achieved when the three ribs of the waveguide are identical     

Method for analysing trapezoidal optical waveguides by anequivalent rectangular rib waveguide

The authors present a simple analysis, using first-order perturbation theory, to determine an equivalent rectangular rib optical waveguide that will model the propagation characteristics of a trapezoidal rib optical waveguide. The results obtained from this method show excellent agreement with the results from the more accurate finite element method     

A rib optical waveguide with cutoff mesa isolation

A rib optical waveguide using the concept of optical cutoff to provide isolation between adjacent waveguides in a photonic integrated circuit is disclosed. Due to the evanescent nature of light propagation in cutoff waveguides, this cutoff mesa rib waveguide permits fabrication of single-moded rib waveguides with minimal self-interference and crosstalk by means of light guided in a remaining slab waveguide. Design rules are given and operation of a single-moded cut-off mesa rib waveguide and an MZI using this waveguide are demonstrated     

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.     

Finite element beam propagation method for three-dimensionaloptical waveguide structures

A beam propagation method (BPM) based on the finite element method (FEM) is described for longitudinally varying three-dimensional (3-D) optical waveguides. In order to avoid nonphysical reflections from the computational window edges, the transparent boundary condition is introduced. The present algorithm using the Pade approximation is, to our knowledge, the first wide-angle finite element beam propagation method for 3-D waveguide structures. To show the validity and usefulness of this approach, numerical results are shown for Gaussian-beam excitation of a straight rib waveguide and guided-mode propagation in a Y-branching rib waveguide     

SOI波导弯曲损耗影响因素的分析

采用有效折射率方法EIM(effective index method)和二维束传播算法（2D-BPM）对SOI (silicon-on-insulator）波导弯曲损耗的几种影响因素进行了分析. 通过模拟发现弯曲损耗随弯曲半径的增大、波导宽度的增加及内外脊高比的减小而减小. 同时，改进波导结构，例如在弯曲波导外侧刻槽可以减小SOI脊形波导的弯曲损耗.     

The method of lines for the analysis of dielectric waveguide bends

The analysis of a wide class of waveguide bends using the method of lines is suggested. The discretization is performed in radial direction. The cross section of the waveguide may consist of many inhomogeneous layers. Loss can be taken into account by using complex permittivities. The radiation loss is calculated by the use of absorbing boundary conditions. The presented algorithm is verified by the analysis of a rib waveguide bend. The results are in good agreement with those published in the literature     

条形和脊型SOI 波导微环结构传感性能研究

使用时域有限差分(FDTD)方法研究了基于SOI微环谐振腔结构的条形和脊型波导,探究了微环谐振腔应用于生物传感的理论。分析了结构的几何尺寸对生物传感器灵敏度的影响。通过分析条形和脊型波导的模场分布图,解释了条形波导的灵敏度明显高于脊型波导的原因,且随着波导宽度的增加其灵敏度系数的变化遵循相同的趋势。并且,当条形波导取得最高的灵敏度系数时,其横截面是方形的,然而脊型波导的最大灵敏度值对应的却是不完全对称的几何结构。当条形波导的横截面全对称时,灵敏度达到最大值172.3 nm/RIU。