Abstract

We demonstrate a micro tomographic method to measure arbitrary refractive index profiles of optical fibers and grating structures. The method involves the use of a traditional bright field microscope in conjunction with Quantitative Phase Microscopy. The fiber is rotated through 180 degrees and the phase data is collected, then the filtered back projection technique is used in the computed two-dimensional profile distribution. The complete micro tomographic method makes it possible to reconstruct the optical fiber index distribution without a priori knowledge of the optical fiber.