Precise Measurement of the Refractive Index Profile of Optical Fibers by a Nondestructive Interference Method

Yasuo KOKUBUN  Kenichi IGA  

IEICE TRANSACTIONS (1976-1990)   Vol.E60   No.12   pp.702-707
Publication Date: 1977/12/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Optical and Quantum Electronics

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In This paper, the accuracy of the transverse interference method has been raised up by fully correcting a probing ray refraction due to the index gradient of the fiber. A simulation shows that the error is in principle within 0.3% of the index difference between the core center and the cladding. The index profiles of some fibers were practically measured and it was confirmed that this method can be used for a precise, nondestructive, and fast measurement.