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Technology Exchange
Measurement of optical fiber’s Refractive Index Profile
 
From the design of optical fibers to their fabrication, refractive index profile is a very important basic parameter of optical fibers, and often the practical optical fiber’s refractive index profile is the key that determines if or not the above-mentioned transmission performance can achieve the expected goal.
 
The earliest way (about in the end of 1970s) for the measurement of refractive index profile adopted so-called “Reflection method” which is based on the reflection principle of the light. Afterward refracted near-field technique was proposed, which is ranked as the standard method both at home and abroad. Just as its name implies, the refracted near-field technique utilizes the refraction principle of light. That is if the numerical aperture of the launching light at the incident end is larger than that (NA) of the optical fiber, the launching light will refract from the core into the cladding of the optical fiber. The intensity of the refracted light is related to the “local” NA at the incident point, and the NA of optical fiber is related to the refractive index.  
 
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