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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 21991–22011

Numerical characterization of an ultra-high NA coherent fiber bundle part I: modal analysis

Stefaan Heyvaert, Heidi Ottevaere, Ireneusz Kujawa, Ryszard Buczynski, Marc Raes, Herman Terryn, and Hugo Thienpont  »View Author Affiliations


Optics Express, Vol. 21, Issue 19, pp. 21991-22011 (2013)
http://dx.doi.org/10.1364/OE.21.021991


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Abstract

Advances in fiber optics and CCD technology in the last decades have allowed for a large reduction in outer diameter (from centimeters to submillimeter) of endoscopes. Attempts to reduce the outer diameter even further, however, have been hindered by the trade-off, inherent to conventional endoscopes, between outer diameter, resolution and field of view. Several groups have shown the feasibility of further miniaturization towards so called micro-endoscopes, albeit at the cost of a very reduced field of view. In previous work we presented the design of an ultra-high NA (0.928) Coherent FiberBundle (CFB) that, in combination with proximal wave front shaping, could be used to circumvent this trade-off thus paving the way for even smaller endoscopes. In this paper we analyze how the modal properties of such an ultra-high NA CFB determine the required input field to achieve any desired output field. We use the periodicity of the hexagonal lattice which characterizes a CFB, to define a unit cell of which we analyze the eigen-modes. During the modal analysis, we also take into account realistic variations in lattice constant, core size and core shape due to the limitations of the fabrication technology. Realistic values for these types of fabrication-induced irregularities were obtained via SEM images of a CFB fabricated according to the aforementioned design. The presence of these irregularities results, for a desired output, in the required input to be different from the required input for a defect-free CFB. We find that of the different types of fabrication-induced irregularities present in the CFB, variations in core ellipticity have the biggest impact on the required input for a given desired output.

© 2013 OSA

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2350) Fiber optics and optical communications : Fiber optics imaging
(060.2400) Fiber optics and optical communications : Fiber properties
(170.2150) Medical optics and biotechnology : Endoscopic imaging

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 10, 2013
Revised Manuscript: August 23, 2013
Manuscript Accepted: August 27, 2013
Published: September 11, 2013

Virtual Issues
Vol. 8, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Stefaan Heyvaert, Heidi Ottevaere, Ireneusz Kujawa, Ryszard Buczynski, Marc Raes, Herman Terryn, and Hugo Thienpont, "Numerical characterization of an ultra-high NA coherent fiber bundle part I: modal analysis," Opt. Express 21, 21991-22011 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-19-21991


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