The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber

Thomas D.P. Allsop; Timothy Earthgrowl; Helen Dobb; Vladimir Mezentsev; Andrew Gillooly; David J. Webb; Ian Bennion

doi:10.1117/12.569312

The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber

Thomas D.P. Allsop, Timothy Earthgrowl, Helen Dobb, Vladimir Mezentsev, Andrew Gillooly, David J. Webb, Ian Bennion

Research output: Chapter in Book/Report/Conference proceeding › Conference publication

Abstract

Long period gratings (LPGs) were written into a D-shaped optical fibre, which has an elliptical core with a W-shaped refractive index profile. The LPG's attenuation bands were found to be sensitive to the polarisation of the interrogating light with a spectral separation of about 15nm between the two orthogonal polarisation states. In addition, two spectrally overlapping attenuation bands corresponding to orthogonal polarisation states were observed; modelling successfully reproduced this spectral feature. The spectral sensitivity of both orthogonal states was experimentally measured with respect to temperature, surrounding refractive index, and directional bending. These LPG devices produced blue and red wavelength shifts of the stop-bands due to bending in different directions. The measured spectral sensitivities to curvatures, d?/dR , ranged from -3.56nm m to +6.51nm m. The results obtained with these LPGs suggest that this type of fibre may be useful as a shape/bend sensor. It was also demonstrated that the neighbouring bands could be used to discriminate between temperature and bending and that overlapping orthogonal polarisation attenuation bands can be used to minimise error associated with polarisation.

Original language	English
Title of host publication	Fiber optic sensor technology and applications III
Editors	Michael A. Marcus, Brian Culshaw, John P. Dakin
Place of Publication	Philadelphia, PA (US)
Publisher	SPIE
Pages	266-277
Number of pages	12
DOIs	https://doi.org/10.1117/12.569312
Publication status	Published - 2004
Event	Conference on Fiber Optic Sensor Technology and Applications III - Philadelphia, United States Duration: 26 Nov 2004 → 28 Nov 2004

Publication series

Name	SPIE proceedings
Publisher	SPIE
Volume	5589
ISSN (Electronic)	0277-786X

Conference

Conference	Conference on Fiber Optic Sensor Technology and Applications III
Country	United States
City	Philadelphia
Period	26/11/04 → 28/11/04

Bibliographical note

Thomas D. Allsop ; T. Earthrowl ; H. Dobb ; V. Mezentsev ; A. Gillooly ; D.J. Webb and I. Bennion "The spectral sensitivity of long-period gratings fabricated in elliptical core D-shaped optical fiber", Proc. SPIE 5589, Fiber Optic Sensor Technology and Applications III, 266 (December 14, 2004);

Copyright 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

http://dx.doi.org/10.1117/12.569312

Keywords

long-period fibre gratings
temperature measurement
curvature measurement
d-shaped optical fibre

Access to Document

10.1117/12.569312

The spectral sensitivity of Long Period Gratings fabricated in elliptical core D-Shaped Optical Fibre
Thomas D. Allsop ; Tim Earthrowl ; Helen Dobb ; Vladimir Mezentsev ; Andrew M. Gillooly ; David J. Webb and Ian Bennion "The spectral sensitivity of long-period gratings fabricated in elliptical core D-shaped optical fiber", Proc. SPIE 5589, Fiber Optic Sensor Technology and Applications III, 266 (December 14, 2004); Copyright 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.569312
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Allsop, T. D. P., Earthgrowl, T., Dobb, H., Mezentsev, V., Gillooly, A., Webb, D. J., & Bennion, I. (2004). The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber. In M. A. Marcus, B. Culshaw, & J. P. Dakin (Eds.), Fiber optic sensor technology and applications III (pp. 266-277). (SPIE proceedings; Vol. 5589). SPIE. https://doi.org/10.1117/12.569312

Allsop, Thomas D.P. ; Earthgrowl, Timothy ; Dobb, Helen ; Mezentsev, Vladimir ; Gillooly, Andrew ; Webb, David J. ; Bennion, Ian. / The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber. Fiber optic sensor technology and applications III. editor / Michael A. Marcus ; Brian Culshaw ; John P. Dakin. Philadelphia, PA (US) : SPIE, 2004. pp. 266-277 (SPIE proceedings).

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title = "The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber",

abstract = "Long period gratings (LPGs) were written into a D-shaped optical fibre, which has an elliptical core with a W-shaped refractive index profile. The LPG's attenuation bands were found to be sensitive to the polarisation of the interrogating light with a spectral separation of about 15nm between the two orthogonal polarisation states. In addition, two spectrally overlapping attenuation bands corresponding to orthogonal polarisation states were observed; modelling successfully reproduced this spectral feature. The spectral sensitivity of both orthogonal states was experimentally measured with respect to temperature, surrounding refractive index, and directional bending. These LPG devices produced blue and red wavelength shifts of the stop-bands due to bending in different directions. The measured spectral sensitivities to curvatures, d?/dR , ranged from -3.56nm m to +6.51nm m. The results obtained with these LPGs suggest that this type of fibre may be useful as a shape/bend sensor. It was also demonstrated that the neighbouring bands could be used to discriminate between temperature and bending and that overlapping orthogonal polarisation attenuation bands can be used to minimise error associated with polarisation.",

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Allsop, TDP, Earthgrowl, T, Dobb, H, Mezentsev, V, Gillooly, A, Webb, DJ & Bennion, I 2004, The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber. in MA Marcus, B Culshaw & JP Dakin (eds), Fiber optic sensor technology and applications III. SPIE proceedings, vol. 5589, SPIE, Philadelphia, PA (US), pp. 266-277, Conference on Fiber Optic Sensor Technology and Applications III, Philadelphia, United States, 26/11/04. https://doi.org/10.1117/12.569312

The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber. / Allsop, Thomas D.P.; Earthgrowl, Timothy; Dobb, Helen; Mezentsev, Vladimir; Gillooly, Andrew; Webb, David J.; Bennion, Ian.

Fiber optic sensor technology and applications III. ed. / Michael A. Marcus; Brian Culshaw; John P. Dakin. Philadelphia, PA (US) : SPIE, 2004. p. 266-277 (SPIE proceedings; Vol. 5589).

Research output: Chapter in Book/Report/Conference proceeding › Conference publication

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T1 - The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber

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AU - Dobb, Helen

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AU - Gillooly, Andrew

AU - Webb, David J.

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N2 - Long period gratings (LPGs) were written into a D-shaped optical fibre, which has an elliptical core with a W-shaped refractive index profile. The LPG's attenuation bands were found to be sensitive to the polarisation of the interrogating light with a spectral separation of about 15nm between the two orthogonal polarisation states. In addition, two spectrally overlapping attenuation bands corresponding to orthogonal polarisation states were observed; modelling successfully reproduced this spectral feature. The spectral sensitivity of both orthogonal states was experimentally measured with respect to temperature, surrounding refractive index, and directional bending. These LPG devices produced blue and red wavelength shifts of the stop-bands due to bending in different directions. The measured spectral sensitivities to curvatures, d?/dR , ranged from -3.56nm m to +6.51nm m. The results obtained with these LPGs suggest that this type of fibre may be useful as a shape/bend sensor. It was also demonstrated that the neighbouring bands could be used to discriminate between temperature and bending and that overlapping orthogonal polarisation attenuation bands can be used to minimise error associated with polarisation.

AB - Long period gratings (LPGs) were written into a D-shaped optical fibre, which has an elliptical core with a W-shaped refractive index profile. The LPG's attenuation bands were found to be sensitive to the polarisation of the interrogating light with a spectral separation of about 15nm between the two orthogonal polarisation states. In addition, two spectrally overlapping attenuation bands corresponding to orthogonal polarisation states were observed; modelling successfully reproduced this spectral feature. The spectral sensitivity of both orthogonal states was experimentally measured with respect to temperature, surrounding refractive index, and directional bending. These LPG devices produced blue and red wavelength shifts of the stop-bands due to bending in different directions. The measured spectral sensitivities to curvatures, d?/dR , ranged from -3.56nm m to +6.51nm m. The results obtained with these LPGs suggest that this type of fibre may be useful as a shape/bend sensor. It was also demonstrated that the neighbouring bands could be used to discriminate between temperature and bending and that overlapping orthogonal polarisation attenuation bands can be used to minimise error associated with polarisation.

KW - long-period fibre gratings

KW - temperature measurement

KW - curvature measurement

KW - d-shaped optical fibre

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Allsop TDP, Earthgrowl T, Dobb H, Mezentsev V, Gillooly A, Webb DJ et al. The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fiber. In Marcus MA, Culshaw B, Dakin JP, editors, Fiber optic sensor technology and applications III. Philadelphia, PA (US): SPIE. 2004. p. 266-277. (SPIE proceedings). https://doi.org/10.1117/12.569312