用椭圆高斯场近似计算领结型光纤的模场半径及接头损耗

CALCULATION OF MODE FIELD RADIUS AND SPLICE LOSSES IN BOW-TIE FIBER WITH ELLIPTICAL GAUSSIAN FIELD APPROXIMATION

本文用椭圆高斯场及标量变分原理计算领结型光纤的模斑.由于用了椭圆高斯近似,不仅使模斑计算变得简便而且方便地导出了领结型光纤各种接头损耗与模斑的解析关系.领结型光纤的结构见图1.数值计算表明:领结型光纤的基模在V>1.5时非常接近高斯型.因此这里我们把基模场写成椭圆高斯场:

In this paper, a scalar variation analysis based on elliptical Gaussian field approximation of the fundamental mode of bow-tie fiber is presented. The mode field radii with, various structures are obtained. And also, the relations between the mode field radius and various splice losses of bow-tie fiber are shown in this paper.