Method of measuring the parameters of optical fibers

Details Method of measuring the parameters of optical fibers Method of measuring the parameters of optical fibers

G - Physics

01

B

33/49

G01B 11/02 (2006.01) G01N 21/01 (2006.01)

Patent

CA 1068099

METHOD OF MEASURING THE PARAMETERS OF OPTICAL FIBERS Abstract of the Disclosure The present invention relates to a method of measuring the deviation from concentricity of the core of a clad optical fiber Or known outer diameter and known core and clad refractive indices. The method comprises the steps of directing a beam of spatially coherent, monochromatic radiation at the fiber, to thereby to generate a complex scattering pattern. At least a portion of the pattern includes contributions from the diffraction, the reflection and the refraction of the beam by the fiber. The scattering pattern is spatially radially disposed about the fiber and has a fringe modulation imposed thereon. The smallest angles,.THETA.1 and .THETA.2 are measured at which the modulation first appears in the fringe pattern, .THETA.1 < 0 < .THETA.2. The deviation from concentricity is determined by comparing .THETA.1 and .THETA.2 with corresponding angles priorly measured for similar clad fibers Or known diameter and concentricity and known core and cladding refractive indices.

314820

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