Abstract
The discovery of photosensitivity in germanosilicate fibers1 and the invention of the side writing technique2 has enabled the mass-production of fiber Bragg gratings for communication applications. In parallel, Bragg gratings have also been actively pursued in the area of distributed and multiplexed sensing systems.3 However, Bragg grating sensors suffer from a small temperature sensitivity (0.014 nm/°C at 1300 nm) and often require complex and expensive interferometric techniques to detect measurand-induced wavelength shifts. We propose novel long- period grating-based optical fiber sensors that possess high sensitivities and simple demodulation schemes, and can be easily configured for multiparameter measurements.
© 1996 Optical Society of America
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