Bending and orientational characteristics of long period gratings written in D-shaped optical fiber

Thomas D.P. Allsop*, Andrew M. Gillooly, Vladimir Mezentsev, T. Earthgrowl-Gould, Ron Neal, David J. Webb, Ian Bennion

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Long period gratings (LPGs) were written into a D-shaped single-mode fiber. These LPGs were subjected to a range of curvatures, and it was found that as curvature increased, there was increasingly strong coupling to certain higher order cladding modes without the usual splitting of the LPGs stopbands. A bend-induced stopband yielded a spectral sensitivity of 12.55 nm · m for curvature and 2.2 × 10-2 nm°C-1 for temperature. It was also found that the wavelength separation between adjacent bend-induced stopbands varied linearly as a function of curvature. Blue and red wavelength shifts of the stopbands were observed as the sensor was rotated around a fixed axis for a given curvature; thus, in principle, this sensor could be used to obtain bending and orientational information. The behavior of the stopbands was successfully modeled using a finite element approach.

Original languageEnglish
Pages (from-to)130-135
Number of pages6
JournalIEEE Transactions on Instrumentation and Measurement
Volume53
Issue number1
DOIs
Publication statusPublished - Feb 2004

Bibliographical note

© 2004 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keywords

  • curvature measurement
  • d-shaped optical fiber
  • long-period fiber gratings
  • optical fiber devices
  • temperature measurement

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