Vector bending sensors based on fibre Bragg gratings inscribed by infrared femtosecond laser

Amós Martínez, Yicheng Lai, Mykhaylo Dubov, Igor Khrushchev, Ian Bennion

Research output: Contribution to journalArticle

Abstract

A novel, direction-sensitive bending sensor based on an asymmetric fiber Bragg grating (FBG) inscribed by an infrared femtosecond laser was demonstrated. The technique is based on tight transverse confinement of the femto-inscribed structures and can be directly applied in conventional, untreated singlemode fibers. The FBG structure was inscribed by an amplified, titanium sapphire laser system. The grating cross-section was elongated along the direction of the laser beam with the transverse dimensions of approximately 1 by 2 μm. It was suggested that the sensitivity of the device can be improved by inscribing smaller spatial features and by implementing more complex grating designs aimed at maximizing the effect of strain.

Original languageEnglish
Pages (from-to)472-474
Number of pages3
JournalElectronics letters
Volume41
Issue number8
DOIs
Publication statusPublished - 14 Apr 2005

Keywords

  • approximation theory
  • computational complexity
  • fabrication
  • fiber Bragg gratings
  • infrared devices
  • photosensitivity
  • ultraviolet radiation
  • cross-section
  • directional bending sensitivity
  • femtosecond laser
  • flat-clad fiber

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