光纤维折射率分布的测量方法很多,各有优缺点,至目前为止已介绍的有:反射法、折射法、干涉法、微区分析法、近场法和折射近场法等7种。国内多数单位用干涉法测量,此法虽然直观,但端面要求很高,计算相当繁重。端面反射法比较简单直观(国外已有成套设 There are many ways to measure the refractive index distribution of optical fiber, each has its own advantages and disadvantages. Up to now, seven methods have been introduced, such as reflection method, refraction method, interference method, microanalysis method, near-field method and refraction near-field method. Most domestic units using interferometry, although this method is intuitive, but the face of high requirements, the calculation is very heavy. Face reflection method is relatively simple and intuitive (foreign already complete package design