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) G01B 9/02 (2006.01) G01B 11/12 (2006.01)

Patent

CA 1054361

METHOD OF MEASURING THE PARAMETERS OF OPTICAL FIBERS Abstract of the Disclosure The present invention relates to a method of measuring the cladding thickness, t of a clad optical fiber of known core diameter, DC and of known cladding core refractive indices m1 and m2 respectively. The method comprises the steps of directing a beam of spatially coherent, monochromatic radiation at the fiber to thereby 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 of the fiber. The scattering pattern is spatially radially disposed about the fiber and has a fringe pattern intensity modulation superimposed thereon. The method further includes, at a given reference angle .theta.R, measuring the modulation pattern over an angle range .DELTA..theta.R, where .theta.R satisfies the relationship: .theta.R + 1/2 .DELTA..theta.R < .theta.F, where .theta.F is the fringe cut-off angle which, in turn, satisfies the relation: m1 cos(.theta.F/2) = 1. The method further includes the step of determining the core-to-fiber diameter ratio, R, by comparing the measured modulation pattern with modulation patterns priorly observed for clad optical fibers of the same core and cladding indices, measured at the same scattering angle range .DELTA..theta.R; and then computing the cladding thickness from the equation: t - DC(1 - R)/2R.

314818

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