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

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Abstract

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

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