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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 3 — Feb. 11, 2013
  • pp: 2551–2562

Axial contraction in etched optical fiber due to internal stress reduction

Kok-Sing Lim, Hang-Zhou Yang, Wu-Yi Chong, Yew-Ken Cheong, Chin-Hong Lim, Norfizah M. Ali, and Harith Ahmad  »View Author Affiliations

Optics Express, Vol. 21, Issue 3, pp. 2551-2562 (2013)

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When an optical fiber is dipped in an etching solution, the internal stress profile in the fiber varies with the fiber diameter. We observed a physical contraction as much as 0.2% in the fiber axial dimension when the fiber was reduced from its original diameter to ~6 µm through analysis using high resolution microscope images of the grating period of an etched FBG at different fiber diameters. This axial contraction is related to the varying axial stress profile in the fiber when the fiber diameter is reduced. On top of that, the refractive index of fiber core increases with reducing fiber diameter due to stress-optic effect. The calculated index increment is as much as 1.8 × 10−3 at the center of fiber core after the diameter is reduced down to ~6 µm. In comparison with the conventional model that assumes constant grating period and neglects the variation in stress-induced index change in fiber core, our proposed model indicates a discrepancy as much as 3nm in Bragg wavelength at a fiber diameter of ~6 µm.

© 2013 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(230.1150) Optical devices : All-optical devices
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 16, 2012
Revised Manuscript: November 26, 2012
Manuscript Accepted: November 26, 2012
Published: January 28, 2013

Kok-Sing Lim, Hang-Zhou Yang, Wu-Yi Chong, Yew-Ken Cheong, Chin-Hong Lim, Norfizah M. Ali, and Harith Ahmad, "Axial contraction in etched optical fiber due to internal stress reduction," Opt. Express 21, 2551-2562 (2013)

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