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High-sensitivity temperature sensor based on overlay on side-polished fibers

2000; Institute of Electrical and Electronics Engineers; Volume: 12; Issue: 8 Linguagem: Inglês

10.1109/68.868002

1941-0174

A. Álvarez‐Herrero, H. Guerrero, T. Belenguer, David Lévy,

Advanced Fiber Laser Technologies

A temperature sensor based on overlay on side-polished fibers is presented. It works on the basis of the evanescent field coupling between a single-mode side-polished optical fiber and a dielectric waveguide overlay. The spectrum of a white light beam transmitted through the former system exhibit sharp and deep regularly spaced resonances whose central wavelenths are linearly shifted with temperature. It has a wavelength sensitivity of /spl sim/1 nm//spl deg/C, which is one order of magnitude better than that obtained with fiber Bragg sensors.