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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 24, Iss. 5 — May. 1, 2006
  • pp: 2108–

Waveguide Parameter Design of Graded-Index Plastic Optical Fibers for Bending-Loss Reduction

Kenji Makino, Takaaki Ishigure, and Yasuhiro Koike

Journal of Lightwave Technology, Vol. 24, Issue 5, pp. 2108- (2006)


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Abstract

The waveguide structure of graded-index plastic optical fibers (GI POFs), such as index profile, numerical aperture (NA), and core diameter, is appropriately designed for eliminating bending losses, even under a severe bending condition. The bending loss of GI POFs under a severe bending condition is drastically reduced when the core diameter is smaller than 200 µm and when the NA is higher than 0.25. The bending loss of GI POFs even under a severe bending condition vanishes with a core diameter of 200 µm and an NA of 0.24. It is experimentally confirmed for the first time that the mode coupling due to the bending induces the bending loss. The mode coupling strength before the fiber is bent affects the bending loss seriously. Moreover, the mode-coupling strength is evaluated by the propagation constant difference Δβ between the adjacent modes. The Δβ value, which is a function of the core diameter and NA, affects the bending loss. Therefore, based on the calculation of the Δβ, we propose a guideline for the appropriate design of waveguide parameters for GI POF, in order to suppress the bending loss.

© 2006 IEEE

Citation
Kenji Makino, Takaaki Ishigure, and Yasuhiro Koike, "Waveguide Parameter Design of Graded-Index Plastic Optical Fibers for Bending-Loss Reduction," J. Lightwave Technol. 24, 2108- (2006)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-24-5-2108

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