Abstract
For the first time to the authors’ knowledge, fiber Bragg gratings (FBGs) with tilted structures have been fabricated and characterized. Their performance in sensing temperature, strain, and the surrounding medium’s refractive index was investigated. In comparison with normal FBGs and long-period gratings (LPGs), tilted FBGs exhibit significantly higher refractive-index responsivity and lower thermal cross sensitivity. When the grating sensor was used to detect changes in refractive index, a responsivity as high as /refractive-index unit near an index of 1.33 was demonstrated, which is three times higher than that of conventional LPGs.
© 2006 Optical Society of America
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