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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 4436–4443

Direct measurement of bend-induced mode deformation in large-mode-area fibers

R. C. G. Smith, A. M. Sarangan, Z. Jiang, and J. R. Marciante  »View Author Affiliations

Optics Express, Vol. 20, Issue 4, pp. 4436-4443 (2012)

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In 1976 Marcuse developed an equivalent index model to predict the effects of bending in waveguides, and predicted deformation of the spatial modes in bent optical fibers. Perturbative approaches have been previously applied and tested to predict the behavior of single- and few-moded-fibers. However, much more significant mode deformation has been predicted for large-mode-area fibers than for single- or few-moded-fibers. In this paper, the spatial profiles of modes deformed by bending in large-mode-area fibers are measured for the first time. A finite difference method employing the equivalent index model is used to calculate the modes of the helical fiber, which show an offset that is twice as large as that predicted for single-mode fiber, and mode compression that is five times greater. These calculated results are compared to the experimental data, yielding significantly better agreement than previous perturbative approaches.

© 2012 OSA

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(140.3510) Lasers and laser optics : Lasers, fiber
(230.7370) Optical devices : Waveguides
(230.2285) Optical devices : Fiber devices and optical amplifiers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 14, 2011
Revised Manuscript: December 2, 2011
Manuscript Accepted: December 4, 2011
Published: February 8, 2012

R. C. G. Smith, A. M. Sarangan, Z. Jiang, and J. R. Marciante, "Direct measurement of bend-induced mode deformation in large-mode-area fibers," Opt. Express 20, 4436-4443 (2012)

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