一种简单精准的渐变折射率分布光波导分析方法  

A simple and exact method to analyze optical waveguide with graded index profile

作　　者：张梦若 陈开鑫[1] 

机构地区：[1]电子科技大学通信与信息工程学院光纤通信与传感教育部重点实验室,成都611731

出　　处：《物理学报》2015年第14期169-175,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61177054)资助的课题~~

摘　　要：渐变折射率分布的光波导分析对光波导器件的设计和研究至关重要,近年来已提出了多种分析方法,然而在简便性或准确性上都存在着不足.为此,提出了一种分析渐变折射率分布光波导的方法,能够结合现有的Wentzel-Kramers-Brillouin近似法和离散化的波动方程,构建模场分布,再结合变分运算方程和修正的模式本征方程,计算出较为精确的有效折射率.与其他分析方法相比,该方法较为简单,而且有一定的精度.A simple analytical method is proposed to obtain the exact propagation constants and distributions of electric field intensity of optical waveguides with graded refractive index profile. The method is based on the Wenzel-Kramers- Brillouin （WKB） solution, variational method, modified eigen-equations and discretized scalar wave equation for planar optical waveguide. The expressions of the distribution of electric field intensity based on the conventional WKB method, which diverge around the turning point, have been demonstrated to be very exact in the region beyond the turning point where the refractive index profile varies slowly. The proposed method uses the conventional WKB method to calculate the values of electric field intensity at two adjacent positions beyond the turning point and then the electric field intensity profile for the whole region is obtained by making use of the two calculated values. Two simple and explicit formulas are deduced from the discretized scalar wave equation, which provide a relationship among the values of electric field intensity at three adjacent positions. If the effective refractive index of optical waveguide and the refractive index profile for the whole region are known, we can obtain the value of electric field intensity at any position according to the corresponding values at the adjacent positions by using the two formulas aforementioned. By using the two values calculated by WKB method, the electric field intensity profile for the whole region can be determined through the iterative use of the two formulas. The accuracy of the electric field intensity profile determined by the proposed method is greatly dependent on the accuracy of the applied value of the effective refractive index. To achieve exact propagation constants and distributions of electric field intensity, the variational method and modified eigen-equations are employed in the proposed method. Variational method is a very useful method to improve the accuracy of the propagation constants in the analysis o

关 键 词：渐变折射率分布 光波导 Wentzel—Kramers—Brillouin近似法 变分法 

分 类 号：TN252[电子电信—物理电子学]