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电信和无线电工程
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN 打印: 0040-2508
ISSN 在线: 1943-6009

卷:
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电信和无线电工程

DOI: 10.1615/TelecomRadEng.v60.i789.120
6 pages

Determining of Refractive Index Profile of Optical Fibers from Measured Intensity in Near-Field Zone

A. I. Filipenko
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166

ABSTRACT

Procedure is considered of determining of refractive index profile of optical fibers from measured radiation intensity in near-field zone. Setup for realization of the near-field zone method contains optical system, CCD photosensor, A to D converter, and control computer. Measured values are averaged from results of 10 measurements, are normalized and smoothed out to exclude high-frequency noise. Then the intensity is used in wave equation for calculation of refractive index profile. Methods are studied of elimination of perturbing factor influence on near-field zone intensity; the methods include smoothing out of measured spatial intensity with the use of least square technique based on the orthogonal Laguerre functions and on the use of the Butterworth low-pass filter.