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Applied Optics

Applied Optics


  • Vol. 44, Iss. 26 — Sep. 10, 2005
  • pp: 5368–5373

In-fiber reflection mode interferometer based on a long-period grating for external refractive-index measurement

Dae Woong Kim, Yan Zhang, Kristie L. Cooper, and Anbo Wang  »View Author Affiliations

Applied Optics, Vol. 44, Issue 26, pp. 5368-5373 (2005)

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We present two novel schemes for refractometry based on a long-period fiber grating– (LPG-) based Michelson interferometer. These schemes are designed to overcome the measurement dependence of previously demonstrated LPG-based refractometry on the immersion depth. The first utilizes an unshielded LPG and the second, a shielded one. Both schemes were tested over a certain refractive-index range, and the measurement of glucose concentration in water was experimentally demonstrated. In addition, the temperature sensitivity of the two schemes is discussed.

© 2005 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(350.2770) Other areas of optics : Gratings

Original Manuscript: January 4, 2005
Revised Manuscript: April 21, 2005
Manuscript Accepted: May 16, 2005
Published: September 10, 2005

Dae Woong Kim, Yan Zhang, Kristie L. Cooper, and Anbo Wang, "In-fiber reflection mode interferometer based on a long-period grating for external refractive-index measurement," Appl. Opt. 44, 5368-5373 (2005)

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