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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 12881–12887

Real-time resilient focusing through a bending multimode fiber

Antonio M. Caravaca-Aguirre, Eyal Niv, Donald B. Conkey, and Rafael Piestun  »View Author Affiliations

Optics Express, Vol. 21, Issue 10, pp. 12881-12887 (2013)

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Multimode optical fibers are attractive for biomedical and sensing applications because they possess a small cross section and can bend over small radii of curvature. However, mode phase-velocity dispersion and random mode coupling change with bending, temperature, and other perturbations, producing scrambling interference among propagating modes; hence preventing its use for focusing or imaging. To tackle this problem we introduce a system capable of re-focusing light through a multimode fiber in 37ms, one order of magnitude faster than demonstrated in previous reports. As a result, the focus spot can be maintained during significant bending of the fiber, opening numerous opportunities for endoscopic imaging and energy delivery applications. We measure the transmission matrix of the fiber by projecting binary-amplitude computer generated holograms using a digital micro-mirror device controlled by a field programmable gate array. The system shows two orders of magnitude enhancements of the focus spot relative to the background.

© 2013 OSA

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(110.7050) Imaging systems : Turbid media
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Adaptive Optics

Original Manuscript: April 2, 2013
Revised Manuscript: April 29, 2013
Manuscript Accepted: May 14, 2013
Published: May 17, 2013

Virtual Issues
Vol. 8, Iss. 6 Virtual Journal for Biomedical Optics

Antonio M. Caravaca-Aguirre, Eyal Niv, Donald B. Conkey, and Rafael Piestun, "Real-time resilient focusing through a bending multimode fiber," Opt. Express 21, 12881-12887 (2013)

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