METHOD FOR MEASURING CORE DIAMETER OF OPTICAL FIBER

PROBLEM TO BE SOLVED: To provide a method for accurately measuring the core diameter of a multi-mode optical fiber. SOLUTION: This measuring methods includes measuring the strength distribution 14 of light emitted from an optical fiber for measurement, calculating a GI(graded index)-SI(step index) b...

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Bibliographic Details
Main Author UMEMURA TETSUYA
Format Patent
LanguageEnglish
Published 09.10.1998
Edition6
Subjects
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Summary:PROBLEM TO BE SOLVED: To provide a method for accurately measuring the core diameter of a multi-mode optical fiber. SOLUTION: This measuring methods includes measuring the strength distribution 14 of light emitted from an optical fiber for measurement, calculating a GI(graded index)-SI(step index) boundary where the light intensity distribution sharply changes from the center of a GI type core part toward an SI type clad part, regarding the 50% value of the light intensity at the boundary as a threshold, and calculating as the core diameter a length (diameter) connecting distribution positions where the light intensity equals the threshold. The method is particularly excellent in measuring the core diameter of a multi-mode optical fiber of the type between the GI type and the SI type.
Bibliography:Application Number: JP19970077593