Abstract

This paper describes a novel optical fiber microbend sensor architecture which my be utilized in distributed and quasi-distributed measurement. The actual sensor element is graded index multimode fiber coupled to the measurand field through the usual microbend inducing structures. However, the feed to the sensing section is through a single-mode fiber spliced to the multimode 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 single mode within multimode fiber propagates with minimal mode coupling with source to receiver losses of typically 0.7 dB for short sensors ranging to approximately 0.3 dB per each additional kilometer of sensing fiber. The sensitivity of this structure to microbend induced losses has been thoroughly characterized. Typically the optical power loss for a given microbend structure and force is about three to six times higher in this architecture than for conventional fully mode filled microbend sensor. The structure is also almost totally insensitive to macrobend induced losses and allows a variety of novel designs in microbend inducing structures. Additionally, spatial mode filters allow effective control over concatenation effects that are common in microbend sensors.

[IEEE ]

PDF Article

References

  • View by:
  • |

  1. J. N. Fields and J. H. Cole, "Fiber microbend acoustic sensor," Appl. Opt., vol. 19, pp. 3265-3267, 1980.
  2. M. B. J. Diemeer and E. S. Trommel, "Microbend sensors: Sensitivity as a function of distortion wavelength," Opt. Lett., vol. 9, pp. 260-262, 1984.
  3. N. Lagakos et al., "Microbend sensors," Appl. Opt., vol. 26, pp. 2171-2180, 1987.
  4. O. Liunholt et al., "Simple low-temperature sensor that uses microbending loss," Opt. Lett., vol. 16, pp. 1355-l357, 1991.
  5. D. D\!\!\!\!- onlagic and M. Zavrs nik, "Fiber-optic microbend sensor structure," Opt. Lett., vol. 22, pp. 837-839, 1997.
  6. Z. Haas and M. Santoro, "Mode-filtering scheme for improvement of the bandwidth-distance product in multimode fiber systems," J. Lightwave Technol., vol. 11, pp. 1125-1131, 1993.

Cited By

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