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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 22504–22514

Dynamic bending compensation while focusing through a multimode fiber

Salma Farahi, David Ziegler, Ioannis N. Papadopoulos, Demetri Psaltis, and Christophe Moser  »View Author Affiliations

Optics Express, Vol. 21, Issue 19, pp. 22504-22514 (2013)

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Multimode fiber endoscopes have recently been shown to provide sub-micrometer resolution, however, imaging through a multimode fiber is highly sensitive to bending. Here we describe the implementation of a coherent beacon source placed at the distal tip of the multimode fiber, which can be used to compensate for the effects of bending. In the first part of this paper, we show that a diffraction limited focused spot can be generated at the distal tip of the multimode fiber using the beacon. In the second part, we demonstrate focusing even when the fiber is bent by dynamically compensating for it. The speckle pattern at the proximal fiber end, generated by the beacon source placed at its distal end, is highly dependent on the fiber conformation. We experimentally show that by intensity correlation, it is possible to identify the fiber conformation and maintain a focus spot while the fiber is bent over a certain range. Once the fiber configuration is determined, previously calibrated phase patterns could be stored for each fiber conformation and used to scan the distal spot and perform imaging.

© 2013 OSA

OCIS Codes
(070.5040) Fourier optics and signal processing : Phase conjugation
(090.1000) Holography : Aberration compensation
(110.2350) Imaging systems : Fiber optics imaging
(090.1995) Holography : Digital holography
(090.5694) Holography : Real-time holography

ToC Category:
Imaging Systems

Original Manuscript: July 9, 2013
Revised Manuscript: September 7, 2013
Manuscript Accepted: September 10, 2013
Published: September 17, 2013

Salma Farahi, David Ziegler, Ioannis N. Papadopoulos, Demetri Psaltis, and Christophe Moser, "Dynamic bending compensation while focusing through a multimode fiber," Opt. Express 21, 22504-22514 (2013)

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