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In spite of their ubiquitous applications, the characterization of glassfibers by means of all-optical techniques is still facing some limitations.Recently, X-ray absorption has been proposed as a method for visualizing theinner structure of both standard and microstructure optical fibers. Here, weexploit X-ray absorption as nondestructive technique for the characterizationof optical glass fibers. Starting from absorption contrast X-ray computedmicro-tomography measurements, we obtain information about the spatial profileof the fiber refractive index at optical frequencies. We confirm the validityof our approach by comparing its results with complementary characterizationtechniques, based on electron spectroscopy or multiphoton microscopy.

X-ray computed $\mu$-tomography for the characterization of optical fibers