多包层平坦光纤色散的数值分析

Numerical Evaluation of Chromatic Dispersion in Muiticladding Dispersion-Flattend Optical Fibers

采用了等效法求解多包层平坦光纤的色散.假设波导色散和材料色散加性的,计算了平坦阶跃光纤的精确的色散.利用Matlab工具,先给出光纤的色散和传播常数之间的关系,再将多包层平坦光纤的等效为阶跃光纤,计算出等效的折射率,然后用迭代法解方程组计算出传播常数的数值解,最后拟合出光纤的色散曲线.结果表明:将多包层光纤等效为阶跃光纤,减少了计算量,精度也能达到实用要求.

Based on the equivalent principle,an accurate and efficent process is proposed to evaluate chromatic dispersion in multicladding dispersion-flattend single-mode optical fibers. The relation between the dispersion of the fiber and the propagation constant is presented.Then the equivalent refractive index is obtained by equalling the multicladding fiber.The propagation constant is obtained by solving the characteristic equation with computer iteration.Next the chromatic dispersion curve is polyfitted accordin...