Focusing method for nondestructive measurement of optical fiber index profiles.


A new method to determine the refractive-index distributions of the cores of optical fibers is presented. The fiber is immersed in index matching oil to eliminate light refraction at the outer core boundary. Collimated light is passed transversely through the fiber core and is detected with a microscope focused just above the plane of the core boundary. The… (More)
DOI: 10.1364/AO.18.000014


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