This paper lays emphasis on the problem of extracting the isolated eigenmode in spectrum and the iteration accelerating 本文重点研究eigenmode模块算法如何实现对频谱中孤立本征模的萃取及其中遇到的加速迭代的问题。
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In the end of this paper we exam the capability of eigenmode in two kinds of physical model , the testing result shows that the capability of eigenmode , which compare with the function of magic and cst , accord with the practice and what we 本文最后用两种物理器件模型对eigenmode模块进行性能测试,并与常用电磁粒子模拟软件magic和ansoft公司的cst做比较,其测试结果基本符合实际要求。
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It is very important to the electromagnetic simulations . this paper base on the theory and method of electromagnetic calculation and fdtd , associate with the particle simulation technology , develop an algorithm to resolve the problem of the eigenmode analysis of the cold - cavity in practice 本文从分析电磁场计算的基本原理和方法出发,立足于时域有限差分法,结合计算机粒子模拟技术和数值计算原理,开发出一种能够分析计算高功率微波器件冷腔谐振频率以及本征模式的算法。
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The instability in the natural convection boundary layer initiates with the buoyancy eigenmode and develops into non - linear stage with the turbulization of the buoyancy eigenmode . in the mean time , the invisid eigenmode at the inflexion point appears and begins to increase at the outer layer . experimental results show that the turbulent layer near the maximum velocity point can be detected while the reformed grashof number 自然对流边界层的稳定性由浮力振型失稳开始，并随着浮力振型的湍流化进入非线性阶段，与此同时，无粘性振型在外层开始失稳。实验结果表明，修正格拉斯霍夫数grashof
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Around 40 ; the neutral curve obtained by the growth rates of the temperature fluctuation has a ringlike curve separated from the main branch of nachtsheim s calculation by velocity fluctuation at the lower grashof number side ; and its phase velocity is close to the maximum mean velocity where the critical layer of the eigenmode locates . the thermal fluctuation decays rapidly as the nondimensional frequency above 0 . 4 , so that it means that the coupling effect between instability wave generated by buoyancy fluctuation and velocity waves by invicid instability seems weak enough for their critical layers in the range of the nondimensional frequency 详细研究了自然对流边界层中最早失稳的浮力振型的功率谱波长波速与临界层位置等基本特征和它为主导其他振型尚未失稳时按线性理论得到的3种相互独立振型的振幅分布。系统地测量了它所对应的温度和速度涨落的振幅增长规律和中性曲线，实验结果表明，温度涨落的中性曲线在低格拉斯霍夫grashof数
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First of all , the algorithm base on the boundary problem of helmholtz equation and finite - difference technique , calculate the field in “ cold ” cavity and disperse the helmholtz equation , as a result of the formula : ax = x . secondly , according to the eigenvalue of matrix theory and applied iterative methods , eigenmode adopt a numerical approach which allows the improved chebyshev polynomial iteration which based on the power method to extract the isolated eigenmode in the spectrum . finally , we resolve the problem of compatibility in software and insert the eigenmode module into the chipic which will have the function of eigenmode analysis 具体的说: ( 1 )首先以电磁理论中的亥姆霍兹方程的边值问题理论和计算电磁学中的有限差分法为基础,计算冷腔中的场分布并离散亥姆霍兹方程,得到标准的本征值问题: ax = x ; ( 2 )然后根据矩阵理论中的eigenvalue问题和数值计算中的迭代方法,采用改进后的chebyshev多项式,在power迭代法的基础上对ax = x进行多项式迭代,实现对频谱中孤立本征模的萃取; ( 3 )最后将用fortran语言编制的eigenmode模块加入到chipic软件中,解决了eigenmode模块与chipic主代码的兼容问题,从而实现了chipic软件的模式分析功能。
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Abstract : by employing the concept of photon flux , the evolution of the phase and photon flux in the eigenmode state in three - wave mixing , and the requirements for the initial phase and photon flux in this state , are studied in the paper . a special state in which there are only exchanges of the photon flux but no phase variations in the three - wave mixing process is investigated . an all - optical switch based on the eigenmode pushpull nonlinear - optical - mirror is presented , and the properties of this all - optical switch are numerically calculated . the numerical results show that the performance stability is extremely good , and the intensity and phase of the output signal beams can be easily realized and controlled 文摘:利用光子流概念研究了三波混频中本征模状态的相位和光子流的变化，以及该状态对光波的初始相位和初始光子流的要求，研究了三波混频中只有光子流的交换却没有相位变化的特殊状态，提出了本征模状态推拉式非线性光环镜的全光开关，并数值计算了这种全光开关的性能，数值结果表明，该光开关的性能稳定性好，并且易于实现和控制输出信号光的光强及相位
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For the coupling between the laser diode and the tapered single - mode fiber , the overlap integral is used to compute the coupling efficiency on the basis that the laser diode outputting mode field and the fiber eigenmode field is approximated to basic - mode gauss field . and based on the same approximation , the coupling efficiency between the semi - tapered fiber and the laser diode is calculated by using the ray - traced method . the parameters are analyzed for the effect on the coupling efficiency and give the theory foundation to optimize the design of the tapered fiber coupling system 首先通过对半导体激光器输出模式场和光纤本征模式场的高斯基模近似，利用交叠积分计算了锥形单模光纤与激光器的耦合效率问题；其次依据以上近似，利用光线迹踪法计算了半锥形多模光纤与激光器的耦合效率问题，给出各个参数对耦合效率的影响和作用，为优化设计锥形光纤耦合系统提供了理论依据。
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The correlations between wind stress anomaly over the tropical pacific and ssta using svd analysis shows that the wind stress patterns are corresponding to enso eigenmode . it is suggestive that the explanation , simulation and prediction of el nino / la nina evolution in space - time should not be based on a single eigenmode but on their interaction , with emphasis on the fact that superimposition and phase locking are important factors of the event cycle 对纬向、经向风应力距平与ssta做svd分析赤道太平洋地区风应力异常和海表温度异常之间的相关关系显示，经pop分析得到的纬向、经向风应力的空间型与elnino lanina时的ssta具有很好的对应关系。
