Evidence by transmission electron microscopy of densification associated to Bragg grating photoimprinting in germanosilicate optical fibers

Cordier, P., Dupont, S., Douay, M., Martinelli, G., Bernage, P., Niay, P., Bayon, J.F. and Dong, L. (1997) Evidence by transmission electron microscopy of densification associated to Bragg grating photoimprinting in germanosilicate optical fibers. Applied Physics Letters, 70 (10), 1204-1206. (doi:10.1063/1.118531).

Abstract

We propose and demonstrate a polarimetric Er³⁺-doped fiber distributed-feedback laser sensor in which a force applied transversely along the fiber laser induces a birefringence that gives rise to a change in the beat frequency between the two orthogonally polarized laser modes. We measure a sensitivity of ~9.6 GHz/(N/mm), a wide dynamic range with stable two-mode operation for frequency separations up to 50 GHz, and high sensor resolution owing to the narrow beat frequency bandwidth of <10 kHz. The temperature sensitivity is dominated by the temperature dependence of the inherent birefringence. which was measured to be -130 kHz/°C. The sensor permits independent pressure-force and temperature measurements.

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