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Proceedings Paper

Image transmission by multimode optical fiber for microendoscopy
Author(s): Agnese Lucesoli; Tullio Rozzi
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Paper Abstract

The aim of this work is the utilization of individual multimode fibers for the purposes of microendoscopy. In the present contribution we discuss the question of image aberration induced by transmission along the fiber proposing a restoration algorithm. Under LP conditions, and for not too large core diameters, the main cause of aberration is intermodal dispersion, but in this work we demonstrate that it may be computed and corrected. We implemented a restoration algorithm based on the separation and equalization of the contribution of each mode, for both step-index and gradedindex fibers. Simulations show that fibers with a diameter of few tens of microns can transmit even quite detailed images, and the proposed algorithm is effective for both the above types of fibers, for different fiber lengths and for a variety of images. Experimental tests were performed by transmitting a Gaussian beam through a graded index silica fiber (diameter 62.5 μm, NA=0.275). After applying the proposed post-processing to the aberrated image exiting from the fiber, we obtained an error of 0.25 &mgr;m on the FWHM of the original Gaussian beam. In conclusion, it appears possible to "capture" an external image and transmit the same through the fiber towards an observer at the other fiber end, after appropriate phase correction.

Paper Details

Date Published: 18 July 2007
PDF: 9 pages
Proc. SPIE 6631, Novel Optical Instrumentation for Biomedical Applications III, 663117 (18 July 2007); doi: 10.1117/12.728092
Show Author Affiliations
Agnese Lucesoli, Univ. Politecnica delle Marche (Italy)
Tullio Rozzi, Univ. Politecnica delle Marche (Italy)

Published in SPIE Proceedings Vol. 6631:
Novel Optical Instrumentation for Biomedical Applications III
Christian D. Depeursinge, Editor(s)

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