Abstract

A novel principle of light transmission through very small radius bend in optical fibers is presented. The potential applications of the proposed structure are fiber optic sensors and other fiber optic systems. The design makes use of graded index multimode fiber as transmission medium. However,the feed to the multimode fiber is through a single mode fiber to ensure that only the lowest order spatial mode is launched. Similarly the receiver is also coupled to the sensing element through a single mode fiber. The fundamental mode within graded index multimode fiber proves to be very insensitive to macrobends if bend radius is larger than certain critical value. If bend radius is reduced below critical value the loss increases very rapidly and this allows for construction of relatively sensitive macrobend fiber optic sensor. This work presents a quantitative theoretical model of the proposed structure and a detailed experimental investigation of structure with possibilities for its practical applications.

[IEEE ]

PDF Article

References

  • View by:
  • |

  1. A. J. Harris and P. F. Castle, "Bend loss measurements on high numerical aperture single-mode fibers as a function of wavelength and bend radius", J. Lightwave Technol., vol. 4, pp. 34-40, Jan. 1986.
  2. D. Donalgic and B. Culshaw, "Microbend sensor structure for use in distributed and quasi distributed sensor systems based on selective launching and filtering of the modes in graded index multimode fiber", J. Lightwave Technol., vol. 17, pp. 1856-1869, Oct. 1999.

J. Lightwave Technol.

A. J. Harris and P. F. Castle, "Bend loss measurements on high numerical aperture single-mode fibers as a function of wavelength and bend radius", J. Lightwave Technol., vol. 4, pp. 34-40, Jan. 1986.

D. Donalgic and B. Culshaw, "Microbend sensor structure for use in distributed and quasi distributed sensor systems based on selective launching and filtering of the modes in graded index multimode fiber", J. Lightwave Technol., vol. 17, pp. 1856-1869, Oct. 1999.

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.