All-fibre interrogation technique for fibre Bragg sensors using a biconical fibre filter

Lobo Ribeiro, Antonio B.; Ferreira, L. A.; Tsvetkov, M.; Santos, J. L.

http://hdl.handle.net/10284/8012

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Authors

Lobo Ribeiro, Antonio B.

Ferreira, L. A.

Tsvetkov, M.

Santos, J. L.

Abstract(s)

A passive self-referencing all-fibre technique for Bragg wavelength shift detection using a biconical fibre filter is described. This filter, basically a tapered depressed-cladding fibre, exhibits a periodic spectral power dependence which permits direct tracking of wavelength shifts in a 20nm unambiguous range. Dynamic strain resolution of 1.5 μstrain/√Hz has been achieved.