It is because that the coupling term due to polarization and the ignored term due to the weakly guiding approximation are as small as the second order, and they are just the same.
最后认为这是由于偏振耦合项是二阶小量，而弱导近似忽略了与之相等的二阶小量耦合项。
Under the first-order approximation of Taylor expansion, the analytic expression for the defect mode frequency is derived, from which the coupling factor is deduced.
利用泰勒展式的一级近似，得到了缺陷模频率的解析表达式，进而得到紧束缚理论中的耦合因子。
Under rotating wave approximation, the total coherent Hamiltonian of photon-phonon coupling system driven by incident field is introduced.
在旋转波近似下，得到在入射光驱动下光子-声子耦合体系的总的相干性哈密顿算符。
Utilizing equivalent external cavity approximation model, the influence of coupling coefficient on the threshold gain of FBG-ECL is discussed.
根据等效腔模型，讨论了耦合系数对FBGECL阈值特性的影响。
The analytical solutions for the stead state equations of four wave mixing with an arbitrary complex coupling constant are given without the undepleted pump approximation.
在无泵浦非耗竭近似下，给出了复耦合系数为任意值时稳态四波混频耦合波方程组的解析解。
In this paper, we apply the L model for coupling interconnects and present an analytical expression for coupling noise based on dominant-pole approximation.
采用耦合互连的L模型，基于主极点近似的方法给出了耦合噪声的时域解析表达式，讨论了影响峰值噪声电压的因素。
In this paper, we apply the L model for coupling interconnects and present an analytical expression for coupling noise based on dominant-pole approximation.
采用耦合互连的L模型，基于主极点近似的方法给出了耦合噪声的时域解析表达式，讨论了影响峰值噪声电压的因素。
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