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Proceedings Paper

Delivery of an ultrashort spatially focused pulse to the other end of a multimode fiber using digital phase conjugation
Author(s): Edgar E. Morales Delgado; Ioannis N. Papadopoulos; Salma Farahi; Demetri Psaltis; Christophe Moser
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Paper Abstract

Multimode optical fibers potentially allow the transmission of larger amounts of information than their single mode counterparts because of their high number of supported modes. However, propagation of a light pulse through a multimode fiber suffers from spatial distortions due to the superposition of the various exited modes and from time broadening due to modal dispersion. We present a method based on digital phase conjugation to selectively excite in a multimode fiber specific optical fiber modes that follow similar optical paths as they travel through the fiber. The excited modes interfere constructively at the fiber output generating an ultrashort spatially focused pulse. The excitation of a limited number of modes following similar optical paths limits modal dispersion, allowing the transmission of the ultrashort pulse. We have experimentally demonstrated the delivery of a focused spot of pulse width equal to 500 fs through a 30 cm, 200 micrometer core step-index multimode fiber. The results of this study show that two-photon imaging capability can be added to ultra-thin lensless endoscopy using commercial multimode fibers.

Paper Details

Date Published: 10 March 2015
PDF: 7 pages
Proc. SPIE 9335, Adaptive Optics and Wavefront Control for Biological Systems, 93350J (10 March 2015); doi: 10.1117/12.2078023
Show Author Affiliations
Edgar E. Morales Delgado, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Ioannis N. Papadopoulos, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Salma Farahi, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Demetri Psaltis, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Christophe Moser, Ecole Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 9335:
Adaptive Optics and Wavefront Control for Biological Systems
Thomas G. Bifano; Joel Kubby; Sylvain Gigan, Editor(s)

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