Abstract

The effect of CO₂ laser irradiation on the refractive-index change in optical fibers is investigated by measuring the interference fringe shift formed by a long-period fiber grating pair. The refractive-index decrease on CO₂ laser irradiation was due to relaxation of the residual stress, which was formed in optical fibers during the drawing process, and the refractive-index decrease was found to increase linearly with the drawing force. The effect of the CO₂ laser output power on residual-stress relaxation, and fiber elongation was also studied.

© 2002 Optical Society of America

Residual stress relaxation in the core of optical fiber by CO₂ laser irradiation

B. H. Kim, Y. Park, T.-J. Ahn, D. Y. Kim, B. H. Lee, Y. Chung, U. C. Paek, and W.-T. Han
Opt. Lett. 26(21) 1657-1659 (2001)

Observation and analysis of residual stress development resulting from OH impurity in optical fibers

B. H. Kim, Y. Park, D. Y. Kim, U. C. Paek, and W.-T. Han
Opt. Lett. 27(10) 806-808 (2002)

Measurement of CO₂-laser-irradiation-induced refractive index modulation in single-mode fiber toward long-period fiber grating design and fabrication

Yanjun Li, Tao Wei, John A. Montoya, Sandeep V. Saini, Xinwei Lan, Xiling Tang, Junhang Dong, and Hai Xiao
Appl. Opt. 47(29) 5296-5304 (2008)

Strain-insensitive and high-temperature long-period gratings inscribed in photonic crystal fiber

Yinian Zhu, Ping Shum, Hui-Wen Bay, Min Yan, Xia Yu, Juanjuan Hu, Jianzhong Hao, and Chao Lu
Opt. Lett. 30(4) 367-369 (2005)

Residual-stress relaxation and densification in CO₂-laser-induced long-period fiber gratings

Michael R. Hutsel and Thomas K. Gaylord
Appl. Opt. 51(25) 6179-6187 (2012)