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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 28, Iss. 10 — Mar. 15, 2010
  • pp: 1530–1535

High-Temperature Annealing Behaviors of CO$_{2}$ Laser Pulse-Induced Long-Period Fiber Grating in a Photonic Crystal Fiber

Yun-Jiang Rao, De-Wen Duan, Yan-En Fan, Tao Ke, and Min Xu

Journal of Lightwave Technology, Vol. 28, Issue 10, pp. 1530-1535 (2010)

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High-temperature annealing behaviors of long-period fiber grating (LPFG) induced by high-frequency CO$_{2}$ laser pulse in an endlessly single-mode photonic crystal fiber (ESM-PCF) are investigated in this paper. We find that the change difference of effective refractive index between the air holes cladding and the solid core of the ESM-PCF both in grating fabricating and in annealing processes with different mechanisms would cause resonant wavelength red shift. Through annealing the gratings under high temperature at 600 $^{\circ}$C–650 $^{\circ}$C, its stability, linearity, and repeatability to temperature and tensile strain responses under high temperature condition can be greatly enhanced. Our study shows that the changes in fiber glass structure would have significant influence on the optical properties of ESM-PCF LPFG and thus will help understanding of the forming mechanisms and physical characteristics of ESM-PCF LPFG. In addition, ESM-PCF LPFGs can be used as temperature or strain sensors after annealing at high temperature of 600 $^{\circ}$C–650 $^{\circ}$C.

© 2010 IEEE

Yun-Jiang Rao, De-Wen Duan, Yan-En Fan, Tao Ke, and Min Xu, "High-Temperature Annealing Behaviors of CO$_{2}$ Laser Pulse-Induced Long-Period Fiber Grating in a Photonic Crystal Fiber," J. Lightwave Technol. 28, 1530-1535 (2010)

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