LARGE STRAIN SENSING USING BRILLOUIN SCATTERING IN PERFLUORINATED GRADED-INDEX POLYMER OPTICAL FIBER

摘要

We investigate the dependence of Brillouin gain spectra on large strain of > 20% in a perfluorinated graded-index polymer optical fiber, and prove, for the first time, that the dependence of Brillouin frequency shift (BFS) is highly nonlinear. Meanwhile, the Stokes power decreases rapidly when the applied strain is > -10%. This behavior seems to originate from the propagation loss dependence on large strain.