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Optics Letters

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  • Vol. 29, Iss. 13 — Jul. 1, 2004
  • pp: 1464–1466

Fabrication of helical long-period fiber gratings by use of a CO2 laser

Seungtae Oh, Kyung Rok Lee, Un-Chul Paek, and Youngjoo Chung  »View Author Affiliations


Optics Letters, Vol. 29, Issue 13, pp. 1464-1466 (2004)
http://dx.doi.org/10.1364/OL.29.001464


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Abstract

We present a method of helical long-period fiber grating (H-LPFG) fabrication by use of a CO2 laser for use as an optical torque sensor. A conventional optical fiber grating has periodic vertical index changes along its fiber axis, but a H-LPFG has a screw-type index modulation. The helical index modulation is obtained with the asymmetric index change caused by a single-side laser beam exposure. The H-LPFG shows peak shifts with codirectional or contradirectional torsion to the helix. Also, the polarization-dependent loss is measured to be relatively small compared with that of a conventional long-period fiber grating.

© 2004 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

Citation
Seungtae Oh, Kyung Rok Lee, Un-Chul Paek, and Youngjoo Chung, "Fabrication of helical long-period fiber gratings by use of a CO2 laser," Opt. Lett. 29, 1464-1466 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-13-1464


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