Stone F T
Appl Opt. 1977 Oct 1;16(10):2738-42. doi: 10.1364/AO.16.002738.
A technique is presented for rapidly measuring Delta of optical fibers with profiles closely approximating n (r) = n(o) [1 - Delta(r/a)(alpha)], the Delta << 1 limit of the two-parameter Gloge-Marcatili profile. Error analysis indicates an accuracy of about +/-9%. The method is as follows: Using a Michelson interferometer together with a microscope, the transverse optical path through the center of a fiber immersed in index matching fluid is set equal to the optical path through the fluid. This is accomplished by varying the temperature of the fluid. The value of Delta can then be determined from a knowledge of the refractive index of the fluid inferred from temperature measurements. Good agreement is shown between Delta values measured by this technique and those measured by-two other interferometric techniques. The possible use of this method to determine alpha, or to determine the actual profile if it does not follow the assumed shape, is discussed.
本文介绍了一种快速测量光纤Δ值的技术，该光纤的折射率分布与n(r)=n(o)[1 - Δ(r/a)α]非常接近，这是双参数Gloge-Marcatili分布在Δ<<1时的极限情况。误差分析表明测量精度约为±9%。该方法如下：使用迈克尔逊干涉仪和显微镜，使通过浸没在折射率匹配液中的光纤中心的横向光路等于通过该液体的光路。这通过改变液体温度来实现。然后根据温度测量推断出的液体折射率来确定Δ值。该技术测量的Δ值与另外两种干涉测量技术测量的结果显示出良好的一致性。本文还讨论了该方法用于确定α值，或者在实际分布不符合假设形状时确定实际分布的可能性。
