Abstract

We report on the thermal characteristics of Bragg gratings fabricated in polymer optical fibers. We have observed a permanent shift in the grating wavelength at room temperature which occurs when the grating has been heated above a threshold temperature. This threshold temperature is dependent on the thermal history of the grating, and we attribute the effect to a shrinking of the fiber. This effect can be avoided by annealing the fiber before grating inscription, resulting in a linear response with temperature and an increased linear operating temperature range of the grating.

© 2007 Optical Society of America

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  1. Z. Xiong, G. D. Peng, B. Wu, and P. L. Chu, "Highly tunable Bragg gratings in single-mode polymer optical fibers," IEEE Photon. Technol. Lett. 11, 352-354 (1999).
    [CrossRef]
  2. J. M. Yu, X. M. Tao, and H. Y. Tam, "Trans-4-stilbenemethanol-doped photosensitive polymer fibers and gratings," Opt. Lett. 29, 156-158 (2004).
    [CrossRef] [PubMed]
  3. H. Dobb, D. J. Webb, K. Kalli, A. Argyros, M. C. J. Large, and M. A. van Eijkelenborg, "Continuous wave ultraviolet light-induced fiber bragg gratings in few- and single-mode microstructured polymer optical fibers," Opt. Lett. 30, 3296-3298 (2005).
    [CrossRef]
  4. K. Kalli, H. L. Dobb, D. J. Webb, K. Carroll, M. Komodromos, C. Themistos, G. D. Peng, Q. Fang, and I. W. Boyd, "Electrically tunable bragg gratings in single-mode polymer optical fiber," Opt. Lett. 32, 214-216 (2007)
    [CrossRef] [PubMed]
  5. H. Y. Liu, G. D. Peng, and P. L. Chu, "Thermal tuning of polymer optical fiber bragg gratings," IEEE Photon. Technol. Lett. 13, 824 (2001).
    [CrossRef]
  6. H. B. Liu, H. Y. Liu, G. D. Peng, and P. L. Chu, "Strain and temperature sensor using a combination of polymer and silica fibre bragg gratings," Opt. Commun. 219, 139-142 (2003)
    [CrossRef]
  7. G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
    [CrossRef]
  8. S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
    [CrossRef]
  9. S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
    [CrossRef]
  10. T. Ishigure, M. Hirai, M. Sato, and Y. Koike, "Graded-index plastic optical fiber with high mechanical properties enabling easy network installations. I," J. Appl. Polym. Sci. 91, 404-409 (2004).
    [CrossRef]
  11. E. E. Shafee, "Effect of photodegradation on the [beta]-relaxation in poly(methylmethacrylate)," Polym. Degrad. Stabil. 53, 57-61 (1996).
    [CrossRef]
  12. M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
    [CrossRef]

2007 (1)

2006 (2)

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

2005 (1)

2004 (4)

G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
[CrossRef]

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

T. Ishigure, M. Hirai, M. Sato, and Y. Koike, "Graded-index plastic optical fiber with high mechanical properties enabling easy network installations. I," J. Appl. Polym. Sci. 91, 404-409 (2004).
[CrossRef]

J. M. Yu, X. M. Tao, and H. Y. Tam, "Trans-4-stilbenemethanol-doped photosensitive polymer fibers and gratings," Opt. Lett. 29, 156-158 (2004).
[CrossRef] [PubMed]

2003 (1)

H. B. Liu, H. Y. Liu, G. D. Peng, and P. L. Chu, "Strain and temperature sensor using a combination of polymer and silica fibre bragg gratings," Opt. Commun. 219, 139-142 (2003)
[CrossRef]

2001 (1)

H. Y. Liu, G. D. Peng, and P. L. Chu, "Thermal tuning of polymer optical fiber bragg gratings," IEEE Photon. Technol. Lett. 13, 824 (2001).
[CrossRef]

1999 (1)

Z. Xiong, G. D. Peng, B. Wu, and P. L. Chu, "Highly tunable Bragg gratings in single-mode polymer optical fibers," IEEE Photon. Technol. Lett. 11, 352-354 (1999).
[CrossRef]

1996 (1)

E. E. Shafee, "Effect of photodegradation on the [beta]-relaxation in poly(methylmethacrylate)," Polym. Degrad. Stabil. 53, 57-61 (1996).
[CrossRef]

Argyros, A.

H. Dobb, D. J. Webb, K. Kalli, A. Argyros, M. C. J. Large, and M. A. van Eijkelenborg, "Continuous wave ultraviolet light-induced fiber bragg gratings in few- and single-mode microstructured polymer optical fibers," Opt. Lett. 30, 3296-3298 (2005).
[CrossRef]

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Bachmann, A.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Barton, G.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
[CrossRef]

Barton, G. W.

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

Barton, G.W.

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

Boyd, I. W.

Carroll, K.

Chu, P. L.

H. B. Liu, H. Y. Liu, G. D. Peng, and P. L. Chu, "Strain and temperature sensor using a combination of polymer and silica fibre bragg gratings," Opt. Commun. 219, 139-142 (2003)
[CrossRef]

H. Y. Liu, G. D. Peng, and P. L. Chu, "Thermal tuning of polymer optical fiber bragg gratings," IEEE Photon. Technol. Lett. 13, 824 (2001).
[CrossRef]

Z. Xiong, G. D. Peng, B. Wu, and P. L. Chu, "Highly tunable Bragg gratings in single-mode polymer optical fibers," IEEE Photon. Technol. Lett. 11, 352-354 (1999).
[CrossRef]

Dobb, H.

Dobb, H. L.

Fang, Q.

Gan, J.

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

Harvey, J. D.

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

Henry, G.

G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
[CrossRef]

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Hirai, M.

T. Ishigure, M. Hirai, M. Sato, and Y. Koike, "Graded-index plastic optical fiber with high mechanical properties enabling easy network installations. I," J. Appl. Polym. Sci. 91, 404-409 (2004).
[CrossRef]

Ishigure, T.

T. Ishigure, M. Hirai, M. Sato, and Y. Koike, "Graded-index plastic optical fiber with high mechanical properties enabling easy network installations. I," J. Appl. Polym. Sci. 91, 404-409 (2004).
[CrossRef]

Issa, N. A.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Kalli, K.

Klein, K. E.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Koike, Y.

T. Ishigure, M. Hirai, M. Sato, and Y. Koike, "Graded-index plastic optical fiber with high mechanical properties enabling easy network installations. I," J. Appl. Polym. Sci. 91, 404-409 (2004).
[CrossRef]

Komodromos, M.

Kruhlak, R. J.

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

Large, M. C. J.

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

H. Dobb, D. J. Webb, K. Kalli, A. Argyros, M. C. J. Large, and M. A. van Eijkelenborg, "Continuous wave ultraviolet light-induced fiber bragg gratings in few- and single-mode microstructured polymer optical fibers," Opt. Lett. 30, 3296-3298 (2005).
[CrossRef]

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
[CrossRef]

Law, S. H.

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

Liu, H. B.

H. B. Liu, H. Y. Liu, G. D. Peng, and P. L. Chu, "Strain and temperature sensor using a combination of polymer and silica fibre bragg gratings," Opt. Commun. 219, 139-142 (2003)
[CrossRef]

Liu, H. Y.

H. B. Liu, H. Y. Liu, G. D. Peng, and P. L. Chu, "Strain and temperature sensor using a combination of polymer and silica fibre bragg gratings," Opt. Commun. 219, 139-142 (2003)
[CrossRef]

H. Y. Liu, G. D. Peng, and P. L. Chu, "Thermal tuning of polymer optical fiber bragg gratings," IEEE Photon. Technol. Lett. 13, 824 (2001).
[CrossRef]

Lwin, R.

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

Manos, S.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Peng, G. D.

K. Kalli, H. L. Dobb, D. J. Webb, K. Carroll, M. Komodromos, C. Themistos, G. D. Peng, Q. Fang, and I. W. Boyd, "Electrically tunable bragg gratings in single-mode polymer optical fiber," Opt. Lett. 32, 214-216 (2007)
[CrossRef] [PubMed]

H. B. Liu, H. Y. Liu, G. D. Peng, and P. L. Chu, "Strain and temperature sensor using a combination of polymer and silica fibre bragg gratings," Opt. Commun. 219, 139-142 (2003)
[CrossRef]

H. Y. Liu, G. D. Peng, and P. L. Chu, "Thermal tuning of polymer optical fiber bragg gratings," IEEE Photon. Technol. Lett. 13, 824 (2001).
[CrossRef]

Z. Xiong, G. D. Peng, B. Wu, and P. L. Chu, "Highly tunable Bragg gratings in single-mode polymer optical fibers," IEEE Photon. Technol. Lett. 11, 352-354 (1999).
[CrossRef]

Poisel, H.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Pok, W.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Poladian, L.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

Sato, M.

T. Ishigure, M. Hirai, M. Sato, and Y. Koike, "Graded-index plastic optical fiber with high mechanical properties enabling easy network installations. I," J. Appl. Polym. Sci. 91, 404-409 (2004).
[CrossRef]

Shafee, E. E.

E. E. Shafee, "Effect of photodegradation on the [beta]-relaxation in poly(methylmethacrylate)," Polym. Degrad. Stabil. 53, 57-61 (1996).
[CrossRef]

Song, E. W. M.

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

Tam, H. Y.

Tao, X. M.

Themistos, C.

van Eijkelenborg, M. A.

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

H. Dobb, D. J. Webb, K. Kalli, A. Argyros, M. C. J. Large, and M. A. van Eijkelenborg, "Continuous wave ultraviolet light-induced fiber bragg gratings in few- and single-mode microstructured polymer optical fibers," Opt. Lett. 30, 3296-3298 (2005).
[CrossRef]

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
[CrossRef]

Webb, D. J.

Wu, B.

Z. Xiong, G. D. Peng, B. Wu, and P. L. Chu, "Highly tunable Bragg gratings in single-mode polymer optical fibers," IEEE Photon. Technol. Lett. 11, 352-354 (1999).
[CrossRef]

Xiong, Z.

Z. Xiong, G. D. Peng, B. Wu, and P. L. Chu, "Highly tunable Bragg gratings in single-mode polymer optical fibers," IEEE Photon. Technol. Lett. 11, 352-354 (1999).
[CrossRef]

Yan, C.

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

Yu, J. M.

Zagari, J.

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
[CrossRef]

Electron. Lett. (1)

M. A. van Eijkelenborg, A. Argyros, A. Bachmann, G. Barton, M. C. J. Large, G. Henry, N. A. Issa, K. E. Klein, H. Poisel, W. Pok, L. Poladian, S. Manos, and J. Zagari, "Bandwidth and loss measurements of graded-index microstructured polymer optical," Electron. Lett. 40, 592-593 (2004).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

Z. Xiong, G. D. Peng, B. Wu, and P. L. Chu, "Highly tunable Bragg gratings in single-mode polymer optical fibers," IEEE Photon. Technol. Lett. 11, 352-354 (1999).
[CrossRef]

H. Y. Liu, G. D. Peng, and P. L. Chu, "Thermal tuning of polymer optical fiber bragg gratings," IEEE Photon. Technol. Lett. 13, 824 (2001).
[CrossRef]

J. Appl. Polym. Sci. (1)

T. Ishigure, M. Hirai, M. Sato, and Y. Koike, "Graded-index plastic optical fiber with high mechanical properties enabling easy network installations. I," J. Appl. Polym. Sci. 91, 404-409 (2004).
[CrossRef]

Opt. Commun. (3)

H. B. Liu, H. Y. Liu, G. D. Peng, and P. L. Chu, "Strain and temperature sensor using a combination of polymer and silica fibre bragg gratings," Opt. Commun. 219, 139-142 (2003)
[CrossRef]

S. H. Law, J. D. Harvey, R. J. Kruhlak, E. W. M. Song, G. W. Barton, M. A. van Eijkelenborg, and M. C. J. Large, "Cleaving of microstructured polymer optical fibres," Opt. Commun. 258, 193-202 (2006).
[CrossRef]

S. H. Law, M. A. van Eijkelenborg, G. W. Barton, C. Yan, R. Lwin, and J. Gan, "Cleaved end-face quality of microstructured polymer optical fibres," Opt. Commun. 265, 513-520 (2006).
[CrossRef]

Opt. Fiber Technol. (1)

G. Barton, M. A. van Eijkelenborg, G. Henry, M. C. J. Large, and J. Zagari, "Fabrication of microstructured polymer optical fibers," Opt. Fiber Technol. 10, 325-335 (2004).
[CrossRef]

Opt. Lett. (3)

Polym. Degrad. Stabil. (1)

E. E. Shafee, "Effect of photodegradation on the [beta]-relaxation in poly(methylmethacrylate)," Polym. Degrad. Stabil. 53, 57-61 (1996).
[CrossRef]

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Figures (6)

Fig. 1.
Fig. 1.

Microscope image of cross section of the SMmPOF

Fig. 2.
Fig. 2.

Reflection spectrum of a grating fabricated in SMmPOF FWHM = 2.2nm.

Fig. 3.
Fig. 3.

Heating rig which is positioned between two v-grooves

Fig. 4.
Fig. 4.

Bragg wavelength shift with temperature for three consecutive heating cycles. oe-15-14-8844-i001 First cycle, oe-15-14-8844-i002 second cycle,oe-15-14-8844-i003 third cycle. Inset: deviation from linear response for each cycle (data from successive cycles is offset by -1nm for clarity).

Fig. 5.
Fig. 5.

Bragg wavelength shift with temperature for three different gratings. oe-15-14-8844-i004 - shown in Fig. 4 heated in 3 consecutive cycles, oe-15-14-8844-i005 - grating heated to 86°C, oe-15-14-8844-i006 - grating heated to 92°C,.

Fig. 6.
Fig. 6.

Bragg wavelength shift with temperature for oe-15-14-8844-i007 a grating made in fiber preannealed for oe-15-14-8844-i008 hours at 80°C, and for A a grating made in the non-preannealed fiber. Inset: grating spectrum showing double peak, possibly due to the few-moded nature of the fiber.

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