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本文着重介绍作者研制的单模光纤群折射率参数的测量系统的原理、测试结果及误差分析。其测量总不确定度（１σ）优于６×１０－５。该测量系统将用于ＯＴＤＲ的校正及光纤传输特性的研究。
This article focuses on the principle, test results and error analysis of the measurement system of refractive index parameters of single-mode fiber group developed by the author. The total uncertainty of measurement (1σ) is better than 6 × 10-5. The measurement system will be used for OTDR calibration and fiber transmission characteristics of the study.