Long period grating directional bend sensor based on asymmetric index modification of cladding

Thomas D.P. Allsop*, Mykhaylo Dubov, Amós Martínez, Filip Floreani, Igor Khrushchev, David J. Webb, Ian Bennion

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A long period grating (LPG) written in a standard optical fibre was modified by using a femtosecond laser to induce an asymmetric change in the cladding's refractive index. This device produced blue and red wavelength shifts depending on the orientation of applied curvature, with maximum sensitivities of -1.6 nm m and +3.8 nm m, suggesting that this type of LPG may be useful as a shape sensor.

Original languageEnglish
Pages (from-to)59-60
Number of pages2
JournalElectronics letters
Volume41
Issue number2
DOIs
Publication statusPublished - 20 Jan 2005

Keywords

  • cladding
  • finite element method
  • light sources
  • optical fibers
  • photosensitivity
  • refractive index
  • spectrum analyzers
  • standards
  • waveguides
  • concave bending
  • curvature sensors
  • long period grating
  • transmission spectrum

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