Fiber-optic bend sensor based on a section of double-cladding fiber
نویسنده
چکیده
A fiber-optic structure based on a section of a double-clad fiber with depressed inner cladding is investigated for bend sensing. The structure is formed by splicing a section of SM630 fiber between two standard fibers SMF-28. The operation principle relies on the sensitivity of cladding modes that are induced at a splice of fibers having different refractive index profiles. The transmission spectra of the structure demonstrate a shift of dips to long wavelengths with increasing curvature of the fiber. The sensitivities of the spectral dips to the bend curvature are measured. A fiber-optics scheme with two light sources is proposed for bend sensing.
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