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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 29 — Oct. 10, 2008
  • pp: 5296–5304

Measurement of CO 2 -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  »View Author Affiliations


Applied Optics, Vol. 47, Issue 29, pp. 5296-5304 (2008)
http://dx.doi.org/10.1364/AO.47.005296


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Abstract

We report a new method to measure the CO 2 -laser-irradiation-induced refractive index modulation in the core of a single-mode optical fiber for the purpose of design and fabrication of long-period fiber gratings (LPFGs) without applying tension. Using an optical fiber Fabry–Perot interferometer, the laser-induced axial refractive index perturbation was measured. We found that the CO 2 -laser-irradiation-induced refractive index change in the fiber core had a negative value and that the magnitude was a sensitive function of the laser exposure time following almost a linear relation. Under the assumption of a Gaussian-shaped refractive index modulation profile and based on the first two terms of Fourier series approximation, the measured refractive index perturbations were used to simulate the LPFG transmission spectra. LPFGs with the same laser exposure parameters were fabricated without applying tension, and their spectra were compared with those obtained by simulations.

© 2008 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 23, 2008
Revised Manuscript: September 9, 2008
Manuscript Accepted: September 9, 2008
Published: October 7, 2008

Citation
Yanjun Li, Tao Wei, John A. Montoya, Sandeep V. Saini, Xinwei Lan, Xiling Tang, Junhang Dong, and Hai Xiao, "Measurement of CO2-laser-irradiation-induced refractive index modulation in single-mode fiber toward long-period fiber grating design and fabrication," Appl. Opt. 47, 5296-5304 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-29-5296


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