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


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
Issue number1
Publication statusPublished - Feb 2004

Bibliographical note

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


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