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O'Mahoney, K.T.; Main, A.S.; Webb, D.J.; Martínez, A.; Flavin, D.A.
Publisher: SPIE
Languages: English
Types: Part of book or chapter of book

Classified by OpenAIRE into

mesheuropmc: genetic structures
We report on high power issues related to the reliability of fibre Bragg gratings inscribed with an infrared femtosecond laser using the point-by-point writing method. Conventionally, fibre Bragg gratings have usually been written in fibres using ultraviolet light, either holographically or using a phase mask. Since the coating is highly absorbing in the UV, this process normally requires that the protective polymer coating is stripped prior to inscription, with the fibre then being recoated. This results in a time consuming fabrication process that, unless great care is taken, can lead to fibre strength degradation, due to the presence of surface damage. The recent development of FBG inscription using NIR femtosecond lasers has eliminated the requirement for the stripping of the coating. At the same time the ability to write gratings point-by-point offers the potential for great flexibility in the grating design. There is, however, a requirement for reliability testing of these gratings, particularly for use in telecommunications systems where high powers are increasingly being used in long-haul transmission systems making use of Raman amplification. We report on a study of such gratings which has revealed the presence of broad spectrum power losses. When high powers are used, even at wavelengths far removed from the Bragg condition, these losses produce an increase in the fibre temperature due to absorption in the coating. We have monitored this temperature rise using the wavelength shift in the grating itself. At power levels of a few watts, various temperature increases were experienced ranging from a few degrees up to the point where the buffer completely melts off the fibre at the grating site. Further investigations are currently under way to study the optical loss mechanisms in order to optimise the inscription mechanism and minimise such losses.
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    • 1. Y.J.Rao, “Recent progress in applications of in-fibre bragg grating sensors,” Optics and Lasers in Engineering 31, pp. 297-324, 1999.
    • 2. C. Wei, C. Ye, S. James, R. Tatam, and P. Irving, “The influence of hydrogen loading and the fabrication process on the mechanical strength of optical fibre bragg gratings,” Optical Materials 20, pp. 241-251, 2002.
    • 3. A.Martinez, M.Dubov, I.Khrushchev, and I.Bennion, “Direct writing of fibre bragg gratings by femtosecond laser,” Electronic Letters 40, September 2004.
    • 4. A.Martinez, Y.Lai, M.Dubov, I.Y.Khrushchev, and I.Bennion, “Vector bending sensors based on fibre bragg gratings inscribed by infrared femtosecond laser,” Electronics Letters 41(8), 2005.
    • 5. D.Homoelle, S.Wielandy, and A. L.Gaeta, “Infrared photosensitivity in silica glasses exposed to femtosecond laser pulses,” Optics Letters 24, pp. 1311-1313, September 1999.
    • 6. D.P.Hand and P.S.Russell, “Solitary thermal shock waves and optical damage in optical fibres - the fibre fuse,” Optics Letters 13, pp. 767-769, Sep 1988.
    • 7. K. Seo, N. Nishimura, and M. Shiino, “Evaluation of high-power endurance in optical fiber links,” Furukawa Review (24), 2003.
    • 8. R. Percival, E. Sikora, and R. Wyatt, “Catastrophic damage and accelerated ageing in bent fibres caused by high optical powers,” Electronics Letters 36, March 2000.
    • 9. E. Sikora, D. McCartney, K. Farrow, and R. Davey, “Reduction in fibre reliability due to highoptical power,” Electronics Letters 39, July 2003.
    • 10. A. D. Kersey and T. A. Berkoff, “Fiber-optic bragg grating strain sensor with drift-compensated highresolution interferometric wavelength-shift detection,” Optics Letters 18, January 1993.
    • 11. K. O. Hill and G. Meltz, “Fiber bragg grating technology fundamentals and overview,” Journal of Llightwave Technology, 15, August 1997.
    • 12. Y.-J. Rao, “In fibre bragg grating sensors,” Meas. Sci. Technol. 8, pp. 355-375, 1997.
    • 13. S. Abbenseth and S. Lochmann, “Distinct enlargement of network size or measurement speed for serial fbg sensor networks utilizing sik-ds-cdma,” Journal of Physics Conference Series 15, pp. 149-154, 2005.
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