Optical Fiber Preform, Method For Measuring Refractive Index Profile Of Optical Fiber Preform, And Method For Producing Optical Fiber Preform.

Abstract: A preform (1P) for optical fibers according to the present invention has a refractive index profile that contains a fluctuation region in which a fluctuation (20), wherein the refractive index increases or decreases, is repeated; at least a part of the fluctuation region is contained in an outer region (OR) that is at a distance (L) of 7 mm or more from the center of the preform (1P) for optical fibers; and the width (20W) of the fluctuation 20 in the radial direction within the outer region (OR) is less than 2 µm.

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