Lobo Ribeiro, Antonio B.Ferreira, L. A.Tsvetkov, M.Santos, J. L.2019-09-232019-09-231996http://hdl.handle.net/10284/8012A 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.engjournal article10.1049/el:19960260