Abstract

Unexpected micrometer-scale patterns in the induced refractive index of various commercial fiber Bragg gratings (FBGs) are observed in the cross-sectional fiber directions, which are in addition to the expected periodic variations along the fiber axis. These measurements were made using 3D tomographic deconvolution phase microscopy, a type of quantitative phase imaging. The cross-sectional patterns observed are shown to exhibit a variety of appearances, including fringes normal to the fiber axis and radial blades, the details apparently depending on the FBG writing method.

© 2019 Optical Society of America

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