平板波导谐振腔耦合损失的衍射理论

计算了一板波导谐振腔的耦合损失，给出了平板波导中ＥＨ１１模的耦合损失与球镜的曲率及位置的关系。计算结果表明存在两种特定的结构使耦合损失最小。     

平板波导谐振腔的耦合损失和模式特征

相应于方波导或圆波导的三种低耦合损失的谐振腔结构，即平行平面、半共心、半共焦结构、计算了不同纵横比的平板波导内各种模式的耦合损失，讨论了平板波导激光器谐振腔的设计和模式特征。     

一种全面测定平板波导折射率参数的新方法

本文通过对耦合棱镜中反射光束强度变化的测量，给出了平板波导的全部折射率参数，包括波导表面，波导模以及衬底的折射率，由此可以精确的得到平板波导的折射率分布，为波导的设计提供了可靠的参数。     

平板波导的非线性耦合

给出了两个平板波导耦合成的定向耦合器,当两波导的间隙为克尔型非线性人质时耦合系数与导波功率的关系的计算公式与计算步骤,给出了耦合区为自聚焦介质及自散焦介质两情况的计算实例,并对计算结果进行了讨论     

用准对称波导法测量薄膜参数

本文指出了在棱镜耦合状态下降低平板波导基模截止厚度的途径,用文中提出的准对称波导法测量了薄的MgO膜的折射率和厚度,并给出了测量结果.     

同轴圆筒波导激光器谐振腔的耦合损失及模式特征

计算了同轴圆筒波导谐振腔的耦合损失,结果表明存在三种低耦合损失谐振腔结构,最后分析了谐振腔的模式特性及其设计方法。     

扩散平板光波导的等效阶跃平板波导方法

本文引入一种研究扩散光波导传播特性及设计计算的新方法——等效阶跃平板波导方法.建立了扩散平板光波导的等效阶跃平板波导模型,进行了一系列的模拟计算,得出了一系列波导传播参量、结构参量与工艺参量之间的关系曲线.这些曲线对于扩散平板光波导的设计计算、工艺参量选择等具有重要指导意义.     

非均匀平板波导的色散方程

利用转移矩阵理论分析了任意折射率分布平板波导的传输特性，导出了非均匀平板波导的近似解析色散方程，并指出了ＷＫＢ近似的局限性，数值比较的结果表明，文中所得公式的精确度优于传统的ＷＫＢ方法和其它近似方法。     

光子晶体平面波导与脊波导高效耦合技术的研究

利用一维变周期谐振腔阵列和非线性缓变边界，可以实现光波从脊波导到光子晶体平面波导 （PCW）的高效耦合.基于平面波展开法（PWE）和时域有限差分法（FDTD），深入分析和讨 论了普通脊波导、2D-PCW结构和本征模以及工作模式、缓变边界形状等对耦合效率的影响， 从而得出光波从脊波导到2D-PCW、再返回脊波导的统一图景.指出考虑模式转换和采用缓变 边界条件可以极大提高PCW与脊波导间的耦合效率.对PC-PW边界采用线性和非线性缓变结构 进行了仿真，讨论了边界缓变程度对耦合效率的影响.结果表明，采用模式耦合和PC-PW余弦 缓变边界时的耦合效率在较宽的带宽内超过了95%. 关键词： 光子晶体波导 脊波导 PWE FDTD 耦合边界     

在一种新的聚合物材料上刻写正弦相位波导光栅及其特性研究

用双光束干涉法在一种新的聚合物材料IAC-4上刻写正弦相位型光栅,实现了光栅耦合光波导,并研究了该光波导对不同偏振态的入射光的传播特性,对光栅的形成进行了理论分析,对光波导的传播常数进行了数值计算,并对该波导光栅在导光的光强调制和方向控制及其在集成光学方面的应用进行了讨论,最后对任意入射角的光栅方程进行了理论探讨. 关键词： 波导光栅 有机聚合物 平板光波导 集成光学     

矩形波导谐振腔耦合损失的角谱分析法

在频域用角谱理论分析了矩形波导激光器谐振腔的耦合系数，计算了矩形波导中ＥＨ１１模的耦合系数，本文的方法可以推广用于对其它模的分析。     

K-Na离子交换单模平面波导的制备及其表征

通过K-Na离子交换技术制备了多模玻璃平面波导.采用棱镜耦合技术测量了波导的有效折射率,用IWKB方法拟合得到K-Na离子交换波导的折射率分布符合高斯分布,由色散曲线得到单模波导的制备条件(即扩散深度范围),从而得出单模波导的离子交换时间范围,制备出单模波导,并通过求解WKB色散方程得出单模波导的表面折射率.用普通数码相机,通过对离子交换平面玻璃光波导传输线进行数字成像,根据传输线上的光强分布拟合出光强传输衰减曲线,计算出单模波导的传输损耗大约为0.4 dB/cm.     

An He-implanted optical planar waveguide in an Nd:YGG laser crystal preserving fluorescence properties

We report the formation of a planar waveguide in an Nd:YGG laser crystal by low-energy He-ion implantation at liquid nitrogen temperature (77 K). The optical properties are measured by the prism coupling and end-face coupling methods, the absorption properties the waveguide and Nd:YGG substrate are obtained. The fluorescence spectrums are investigated by confocal methods. The experimental results revealed that the planar waveguide preserved the absorption and fluorescence properties of the Nd:YGG laser crystal. Thus, the planar waveguide formed by the ion implantation method is a promising candidate in waveguide lasers.     

Coupling Losses and Discrimination of Annular Waveguide Laser Resonators

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Coupling Losses and Discrimination of Annular Waveguide Laser Resonators

An approach of calculating the coupling losses in a coaxial (or annular) waveguide laser resonator is developed by which the computational time is considerably reduced. Computations of the coupling losses for some TE modes of an annular waveguide, as a function of mirror curvature and position, are presented in the limit of large mirror aperture. It is shown that there exist three special configurations to provide low coupling losses. The resonator properties are discussed. The calculating results are useful for design of annular waveguide laser resonators.     

Loss analysis and increasing of the fabrication tolerance of resonant coupling by tapering the mode beating section

The film mode matching method was used to analyze the inter waveguide coupling losses in a passive asymmetric twin waveguide caused by waveguide width and refractive index variation for both resonant and adiabatic coupling at a wavelength of 1,550 nm. The reasons for power losses are shown. It is demonstrated that tapering the mode beating section of the resonant coupler can increase the fabrication tolerance of resonant coupling without increasing the coupling length.     

Integrated diffractive optical mode converter for fiber-to-waveguide coupling

An integrated diffractive optical mode converter, which can be integrated into planar lightwave circuits (PLCs), consisting of a diffractive optical element (DOE) and a slab waveguide is presented for fiber-to-waveguide coupling. The DOE is designed using iterative phase retrieval algorithm. In the iterative algorithm, we introduce a new modification of far-field amplitude constraint to provide very high mode conversion quality. Compared with previously published mode converters, the scheme is more universal because it is applicable for any waveguide structure. In simulation, coupling losses lower than 0.12 dB have been reached for all the discussed waveguides. The converter is shown to be polarization-insensitive and applicable in multi-wavelength PLCs. And the tolerance on axis misalignment has been investigated.     

High-efficiency coupling structure for a single-line-defect photonic-crystal waveguide

We present the design and fabrication of a planar structure for coupling light from a multimode feed waveguide into a single-line-defect photonic-crystal waveguide. Finite-difference time-domain calculations predict a coupling efficiency of greater than 90%, and preliminary experimental results indicate successful coupling through a single-line-defect photonic-crystal waveguide. Device design, fabrication, and characterization are presented.