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The characteristics of the transmission spectrum of the Long-period fiber gratings (LPFGs) based on the coupling of core mode to a higher order cladding mode (HE mode) are investigated using the coupled mode theory. This kind of LPFGs is different from that based on the coupling of core mode to a lower order cladding mode because of the effect of the coupling of core mode to EH cladding mode. When the cladding mode order is higher, the coupling coefficients of core mode to HE and EH cladding modes are comparable and both of the propagation constants of HE and EH cladding modes approach, so the spectrum has an additional loss peak. The bandwidth of LPFG based on the coupling of core mode to different cladding mode differs greatly. With the change of the mode orders from lower to higher, the transmission spectrum changes from narrow to wide and more narrow. 相似文献
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声表面波(SAW)陀螺具有无源、无线、单层平面结构等优点。以目前国外研究小组所用的铌酸锂为对象,对含陀螺效应的声表面波的波动方程进行求解。用编制的程序进行了数值计算并绘制了基体绕各不同坐标轴旋转时,陀螺效应对铌酸锂表面传播的声表面波速度及对机电耦合系数影响的相关曲线,并对结果进行了分析。 相似文献
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TOPSIS方法是多准则决策中常用的一种方法.但是该方法无法有效处理决策中的模糊信息,本文提出了一种模糊环境下的TOPSIS方法.在用三角模糊数对语言变量表示的基础上,决策过程中的各个准则的权重和各个备选方案的等级均采用语言变量来描述,这些语言变量由专家确定.为降低决策中的计算量,引入了模糊数的等级均值积分表示,在决策过程中将模糊数计算转化为简单的实数运算.这一优点使得决策中可以避免求解模糊数之间的距离和对模糊数排序.利用一个多准则决策的算例验证了该方法的有效性. 相似文献
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