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Ta2O5平面波导湿度传感器的研究 总被引:3,自引:0,他引:3
本文从应用的角度介绍平面波导传感器的概念及制备方法,在实验的基础上分析和讨论了Ta2O5平面波导湿度传感器的原理,结构与特性测试方法,为开展集成光学平面波导传感器研究提供理论与技术依据。 相似文献
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介绍一种确定平面介质波导导模折射率的新法,它是Ruschin-Lit计模法的推广,与计模法有关的半相位移关系得到完善,本文还给出新法在几种有代表性波导中的应用和计算结果。 相似文献
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任意折射率分布多量子阱波导的色散方程 总被引:1,自引:0,他引:1
利用转移矩阵技术,在建立波导芯区域等效折射率的基础上,导出任意折射率多量子阱波导的色散方程,该方程的数值精度与量子阱数的多少无关。 相似文献
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从弯曲波纹波导中广义耦合波方程出发,进行数值优化迭代,得到在8mm波段,TE01-HE11高功率高效变换器的设计。计算中考虑了金属壁所带来的区分经损耗,并采用了相位重匹配技术以提高转换效率。给出了一组优化设计尺寸及计算结果。 相似文献
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发展了一种以有限元法为基础的数值方法,用它分析由损耗任意大小材料构成的平面非线性波导结构所传导的非线性有损耗光波。在这种方法中,从给出的非线性有损耗波导直接得到TE和TM波与功率有关的复传播常数和局域电磁场分布。 相似文献
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改进WKB近似的新方法 总被引:4,自引:2,他引:2
利用转移矩阵理论,在考虑层间一次反射和转折点处实际相移的基础上,导出了改进的WKB公式,数值计算的结果表明本文所得公式的精度远优于传统的WKB近似,而且能适用于接近于截止的模式和变化剧烈的折射率分布。 相似文献
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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。 相似文献
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Two simple methods, based on simple crystal models, for estimating the longitudinal optical surface vibration mode frequencies which lie in a LALO gap are examined. One method consists of deriving and solving a single-variable equation for the surface mode frequency, which depends only on the experimental bulk dispersion curves. The other method consists of fitting the known dispersion curves of a simple one-dimensional model, for which the optical surface mode frequency is given by a simple expression, to experimental bulk dispersion curves of more complex crystals. The results are compared with detailed theoretical surface mode calculations. The latter method is found to give better estimates. 相似文献
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We describe three major optical characterization methods for fiber and fiber devices. A simple servo controlled scanning fiber-optic confocal microscope is proposed for determining the refractive index profile of an optical fiber. To measure the chromatic dispersion of a short length fiber a Mach-Zehnder fiber interferometer with a novel interferometric distance meter is introduced. At the end, a tomographic method is demonstrated for determining the 2-D stress profile of a fiber. 相似文献
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Experimental and simple analytical investigations have been performed on modulation-frequency-sweeping optical frequency-domain reflectometry (hereafter OFDR) technique for fibre diagnostic purposes. The experimental results are in good agreement with those obtained by computer simulations. Signal-to-noise-ratio improvement of more than 50 dB is expected by using a synchronous-detection type of filtering process. The results well confirm the diagnostic ability of the technique. 相似文献
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Y. W. Zhang 《Optics & Laser Technology》1986,18(5)
By using a white light source and based on the self correlation effect of a group of moving particles, a method is proposed for measuring the velocity and acceleration of the particles. This velocity can be colour coded. A simple theoretical analysis is given and a simulation experiment is presented. The method is simple and economic. 相似文献
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Sources for optical fibre excitation have previously been assumed to be either totally coherent or incoherent. This paper formulates the modal excitation problem for partially coherent sources. The modal excitation coefficients are given in terms of the source complex degree of coherence and numerical results and simple analytical expressions appropriate to multimode step index fibres are presented. The assumption of equal modal power when excitation is by a very incoherent source is examined and the following simple criterion developed: for highly incoherent sources, modes with eigenvaluesU < the reciprocal of the coherence length, measured in units of fibre radius, are approximately equally excited, while the remaining modes carry little power. 相似文献
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Simplified Formula of Bending Loss for Optical Fiber Sensors 总被引:2,自引:0,他引:2
A simple fiber-optic bending loss formula is achieved for optical fiber sensors. This simple formula considers various bending radii, number of turns, extra bending angle, and wavelength and has good agreement with theoretical and experimental data. We also propose a simplified formula for sensitivity of the fiber-optic bending loss in this article. The defined sensitivity formula has the benefit of showing parameters for fiber-optic bending sensor systems. 相似文献
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A simple fiber-optic bending loss formula is achieved for optical fiber sensors. This simple formula considers various bending radii, number of turns, extra bending angle, and wavelength and has good agreement with theoretical and experimental data. We also propose a simplified formula for sensitivity of the fiber-optic bending loss in this article. The defined sensitivity formula has the benefit of showing parameters for fiber-optic bending sensor systems. 相似文献
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H.-H. Witte 《Optics Communications》1976,18(4):559-562
We report on an optical tapping structure for multimode fibers. Its characteristic features are: 1. simple fabrication; 2. good reproducibility; 3. simple technology; 4. high coupling efficiency. The principle of the tap is based on a lateral displacement of waveguides which are butt joined. The displacement defines the fraction of power to be tapped off. With a lateral displacement of 15μm and a fiber with 100 μm outer diameter and 90 μm core diameter (acceptance angle ±30°) we measured a total coupling efficiency of 74% (73% remains in the main trunk line, ? 1% was tapped off) even though this fiber according to its high acceptance angle was not suited for the geometry of our structure. A diagram is given which shows the coupling efficiencies as a function of the lateral displacement of the fibers. 相似文献