共查询到19条相似文献,搜索用时 265 毫秒
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有增益及损耗的平板波导导模的精确微扰分析 总被引:6,自引:0,他引:6
给出求含有增益层与损耗层的突变与渐变折射率剖面多层平板波导导模的微扰与解析计算公式。举例讨论了导模模式的增益(或损耗)与结构参数和偏振的关系,本文方法较求解复本征值的打靶法等简便且节省机时,对于(半导体激光器与半导体激光放大器等)实际遇到的波导结构能给出精确数值结果,并可用以分析材料的增益系数或损耗对TE和TM模式及其增益的影响等问题。 相似文献
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用改进的打靶法求解零温简谐势阱中中性原子玻色-爱因斯坦凝聚的一维Gross-Pitaevskii方程,给出不同非线性参数时凝聚体基态的本征值.用辛算法研究三个凝聚体在撤掉陷俘势后产生的干涉,和三个凝聚体处于同-陷俘势中的干涉及周期性演化,讨论不同的相对相位对凝聚体干涉的影响. 相似文献
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提出一种直接求解在某温度,密度条件下Thomas-Fermi(以下简称TF)方程的数值计算方法-打靶法。同时介绍了为使打靶法收敛而采用的调节试探值的方法,最后给出一些元素的计算结果。 相似文献
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采用科尔-霍普夫(Cole-Hopf)变换法,将渐变折射率波导导模的本征值方程变换为里卡提(Riccati)方程,通过较简洁的数学演算导出导模的传播常量与模场分布的解析解,给出了平方律分布、对称爱泼斯坦(Epstein)分布、爱泼斯坦层的平板波导与平方律分布圆光纤4种折射率分布的计算公式。 相似文献
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采用离子交换法制备了Rb:KTP晶体光波导,在不同波长的耦合光下测量了TE和TM偏振波导模式的有效折射率,拟合了波导层折射率的余误差函数分布,证明了波导折射率增量的各向异性,给出了其色散关系;最后计算并讨论了Rb:KTP波导的扩散特性。 相似文献
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Kulik Y 《The Journal of the Acoustical Society of America》2007,122(5):EL179-EL184
The existing formula for the transfer matrix of conical elements assumes constant wave number, which is only valid for sufficiently short conical elements. In acoustic waveguides, the phase velocity, attenuation constant, and hence complex wave number depend on frequency and cross-section radius. As for conical waveguides, the cross-section radius is position dependent, the transfer matrix must allow for a position-dependent wave number. Taking this into account, this letter presents an analytic derivation of the transfer matrix for conical waveguides with any geometric parameters, which can be utilized to improve the method of computer modeling of complex waveguides. 相似文献
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An Extension of the Effective Index Method to Analyze Leakage Losses in Rib Type Waveguides 总被引:1,自引:0,他引:1
Ben-Hur V. Borges Murilo A. Romero Amilcar C. Cesar 《International Journal of Infrared and Millimeter Waves》1999,20(10):1783-1793
An extension of the effective index method is proposed as a tool to investigate leakage losses in two-dimensional waveguides. The above method, referred to as the Extended Effective Index Method (EEIM), utilizes the Transfer Matrix Technique (TMT) for the calculation of the complex propagation constants. The results show that the EEIM can be applied to conventional rib leaky waveguides as well as to rib ARROW leaky waveguides. The results for rib ARROW waveguides show excellent agreement when compared to those obtained with Finite Element Method. 相似文献
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The efficiency of a new method for calculating the spectrum and attenuation coefficient of leaky electromagnetic modes is demonstrated with multilayer planar optical waveguides the guiding properties of which are determined by antiresonant reflection from the multilayer cladding (antiresonant reflecting optical waveguides) rather than by total internal reflection from the core-cladding interface as in standard optical waveguides. The new method applies to calculation of both electromagnetic modes in dielectric waveguides and electron quantum states in multibarrier semiconductor heterostructures. The characteristics of multilayer waveguides calculated by the new method are compared with published data obtained from a complex dispersion relation by the transfer matrix method. As an example, the wavelength dependence of the radiation losses for the first TE mode of a planar optical waveguide containing 52 pairs of layers is calculated. 相似文献
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本文发展了一种以有限元技术为基础的数值方法,用它分析有损耗波导中的非线性TE模。在这种方法中,非线性有损耗波导中TE波与功率有关的复传播常数和局城电场分布,可从这种波导直接得到,没有任何近似。作为这种方法的应用,计算了非线性有损耗波导系统中TE0模的功率色散关系和电场分布。 相似文献
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求解定态薛定谔方程常常会涉及到常微分方程的本征值问题.目前解常微分方程本征值用的比较多的方法是以龙格-库塔方法为基础的打靶方法.打靶方法常用,但是计算时间长.当边界条件比较复杂或比较敏感的时候,用松弛法会有更好的效果.本文用松弛法解薛定谔方程,并和理论解进行比较.发现松弛法得到的数值解和理论解符合度很高,而且使用松弛法能够很快得到符合要求的解. 相似文献
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The application of the mixed finite-element method for the analysis of dispersion curves of the cylindrical waveguides with
a gradient loading is considered. The test results of the algorithm and the calculations of systems with a variable refractive
index are presented. The initiation of complex waves in layered waveguides is shown. 相似文献
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We propose the concept of an incident angle in the form of complex number and analyse planar optical waveguides by applying
the concept. The complex angle of incidence is concerned with the modelling of prism–gap–waveguide structures. It is shown
that, when optical waveguides are analysed by means of the transfer matrix method, the proposed concept enables us to find
solutions faster and more accurately than by using the method utilizing the leaky structure.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
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V. A. Donchenko G. F. Zargano G. P. Sinyavskii 《Radiophysics and Quantum Electronics》1997,40(10):865-876
We present a method for studying plane-transverse inhomogeneities in waveguides with complex cross sections in the regime
of incidence of several propagating and nonpropagating waves on an inhomogeneity. Vector eigenfunctions and critical wave
numbers of waveguides with complex cross section have been determined using the method of partial regions allowing for a singularity
on the edge.
State University, Rostov-on-Don, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 40, No.
10, pp. 1286–1301, October, 1997. 相似文献