Delivery of an ultrashort spatially focused pulse to the other end of a multimode fiber using digital phase conjugation

Edgar E. Morales Delgado; Ioannis N. Papadopoulos; Salma Farahi; Demetri Psaltis; Christophe Moser

doi:10.1117/12.2078023

10 March 2015 Delivery of an ultrashort spatially focused pulse to the other end of a multimode fiber using digital phase conjugation

Edgar E. Morales Delgado, Ioannis N. Papadopoulos, Salma Farahi, Demetri Psaltis, Christophe Moser

Author Affiliations +

Proceedings Volume 9335, Adaptive Optics and Wavefront Control for Biological Systems; 93350J (2015) https://doi.org/10.1117/12.2078023
Event: SPIE BiOS, 2015, San Francisco, California, United States

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.

Citation Download Citation

Edgar E. Morales Delgado, Ioannis N. Papadopoulos, Salma Farahi, Demetri Psaltis, and Christophe Moser "Delivery of an ultrashort spatially focused pulse to the other end of a multimode fiber using digital phase conjugation", Proc. SPIE 9335, Adaptive Optics and Wavefront Control for Biological Systems, 93350J (10 March 2015); https://doi.org/10.1117/12.2078023

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