Based on these , we get the simulation results of reflect spectrum , and analyze the characteristics of fiber bragg grating of a constant refractive index modulation and period 分别采用耦合模和转移矩阵法对bragg光纤光栅和切趾光栅的反射光谱进行数值模拟仿真,并分析了光栅反射光谱的特性。
In chapter 5 , a long - period fiber grating with rectangular index modulation is studied by the coupled - mode theory . the couple - mode equations that describe the mode coupling in this kind of grating are presented 本章仍以耦合模理论为基础，首先对该类型光栅的折射率微扰进行展开，进而推导其相应的耦合系数和建立耦合模方程。
By use of coupling - of - modes model , this paper computers the characteristic impedance , then puts emphasis on the feedthrough effect which affects saw performance and some advice is given 本文就是顺应军用和民用技术需求进行的工作，通过耦合模模型求解了saw滤波器的特征阻抗，由此重点研究了影响saw器件性能比较严重的电磁直通效应，并提出了改善措施。
Furthermore , we analyze fiber bragg grating of a constant refractive index modulation and period , found the coupled - mode equations that describe interactions between the forward - propagating guided core mode and the backward - propagating guided core mode itself 并用耦合模理论对最简单的均匀光纤布拉格光栅进行分析，建立其耦合模方程，并给出解析解。
2 ) the coupled - mode equation analyzing the characteristics of fiber grating is deduced step by step . two methods - the transfer matrix metod and the runge - kuttar method are compared , which are often used to solve the coupled - mode equation 2 )详细推导用于分析光纤光栅特性的耦合模方程，重点对两种解耦合模方程的方法进行比较：龙格-库塔法和传输矩阵法。
The analytical expressions of reflectance and penetration depth of a light beam transmitted in the back - side - coated chirped mirror are obtained through couple - mode equations with boundary conditions 摘要应用耦合模方程对光波在后端镀膜啁啾反射镜中的传播规律进行分析计算，在分析的过程中加入了边界条件的影响，推导出后端镀膜啁啾反射镜在理想情况下的反射率和穿透深度的解析表达式。
We begin with the maxwell - field equations , deduce the wave - propagation equations , and then analyze the characteristics of guided modes in optical fiber . based on these , we derive the coupled - mode equations that describe the interaction between the modes 从光纤中的麦克斯韦方程组出发，首先推导出描述光在光纤传播的波动方程，进而分析光纤中模式特性，并在此基础上，严格推导出描述模式耦合的耦合模方程。
2 several theory analysis methods for properties of fiber gratings are presented including the coupled - mode theory , transfer matrix approach , multi - film method and fourier transfer method . these methods have their own characteristics and scope of application 2介绍了光纤光栅的理论特性分析,并分别利用耦合模理论、传输矩阵法和傅立叶变换法对各类型光纤光栅(布拉格光栅、长周期光栅、啁啾光栅)的光谱特性进行了分析。
According to fourier analysis theory and the results of coupling theory of uniform fiber grating , the spectral characteristics of sampled fiber grating is studied theoretically and the formula about its overall envelop , peek interval and the number of these peaks are obtained 摘要运用傅立叶分析与均匀光纤光栅耦合模理论的结果，对取样光纤光栅的光谱特性进行了理论研究，得到取样光纤光栅反射峰包络、反射峰间隔和反射峰数量的理论计算公式。
As a result , the peak power , pulse width and time delay of the output pulse have been investigated in detail , including the chirp of the input pulse and the linear dispersion of the filter , and some new and important conclusions have been obtained for the first time 并分析了滤波器的线性色散和入射脉冲的啁啾大小对输出脉冲的影响，对实际的光通信系统中器件参量的设计具有一定的指导意义。利用耦合模理论，对几种典型的光纤光栅进行了研究。
