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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 12,
  • Issue 4,
  • pp. 221-225
  • (2008)

Hydrogen Sensor Based on A Palladium-Coated Long-Period Fiber Grating Pair

Open Access Open Access

Abstract

We propose a simple hydrogen detection scheme based on a Mach-Zehnder interferometer formed with a pair of palladium-coated long-period fiber gratings (LPGs). Since an LPG pair offered a fine-structured interference fringe in its transmission spectrum, the resolution as a sensor could be appreciably enhanced compared to that of a single LPG. As the palladium layer absorbed hydrogen, the effective refractive indices of the cladding modes were increased so that the interference spectrum was blue-shifted up to 2.3 nm with a wavelength sensitivity of -0.29 nm/min for 4% of hydrogen concentration.

© 2008 Optical Society of Korea

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