小弯曲半径下光纤宏弯损耗测试的拟合方法研究

Fitting methods study of optical fiber macro-bend loss measurement at small bending radius

光纤在小弯曲半径下,为提高测试准确性,新版IEC 60793-1-47 Ed. 4.0 b 2017推荐了以浸入高折射率溶液中测试得到的本征宏弯损耗值为参考,根据特定波长测量点的精度比较,选择最佳的拟合方法为测试方法。选择G.657.A1光纤为研究案例,通过对小弯曲半径下宏弯的多种拟合方法进行比较和研究,确定以1550nm和1625nm波长下宏弯拟合值的准确度为参考依据,作为小弯曲半径下光纤宏弯损耗最佳拟合方法选择的思路。

In order to improve test accuracy under small bending radius, the new edition IEC 60793-1-47 Ed. 4.0 b 2017 recommends intrinsic macro-bend loss value tested in immersion high refractive index solution is given as recommended fitting reference, and based on the precision of measuring point of specific wavelength, the best fitting method is selected as the testing method. This paper takes G.657. A1 optical fiber as the research project. By comparing various fitting methods of macro-bend under small bending radius, taking the best measurement accuracy of the fiber macro-bend loss at 1550nm and 1625nm under the small bending radius as the benchmark, the idea of selecting the fitting method for the measurement of the fiber macro-bend loss under the small bending radius is provided.