偏心激励聚合物光纤横截面的光功率分布

研究了偏心激励多模聚合物光纤横截面的光功率分布。用光线追迹法计算了不同的激励源偏心距离和光纤长度时，光纤出射端横截面的光功率分布，并用二维CMOS图像探测器阵列进行了测量。数值计算和实验测量的结果均表明随着激励源偏心距的增加，光功率分布由光纤轴心向外偏移并形成环状；光功率分布在圆周方向的均匀性随着光纤长度的增加而趋于均匀。对中心激励的弯曲光纤光功率分布的测量结果表明，当弯曲曲率半径远大于临界曲率半径时，光功率分布无显著展宽，光功率分布随曲率半径的减小而向曲率外侧偏移；当光纤弯曲半径接近于临界曲率半径时，光功率分布显著展宽。

Optical Power Distribution in Multimode Polymer Optical Fiber under Offset Launching

Numerical and experimental studies of cross sectional optical power distribution (OPD) in polymer optical fiber under offset launch are given. The OPD of fibers with various lengths and under various launch offsets are numerically simulated by using ray tracing method and measured by two-dimensional CMOS image detector array. Results show that the OPD shifts gradually away from axis center and forms ring with increasing of launch offset and the circular uniformity increases with the length of fiber. OPD measurements are taken on bend fibers under center launch. It is indicated that the OPD shift gradually away from axis to outer radii with the decrease of curvature radii when curvature radii are far greater than critical radius of curvature. When curvature radii decrease to critical radius, the OPD is significantly broaden under mode coupling effect.