Abstract
In this paper, a simple and practical method based on multimode fiber (MMF)-single mode chirped fiber Bragg grating (CFBG) structures for highly sensitive bending measurement is proposed. By employing the wide wavelength resonance of CFBG, enhanced backward cladding modes can be achieved through the coupling and recoupling between MMF and CFBG. Experiential results indicate that cladding modes with a large wavelength range can be effectively excited through the proposed sensor structure, and a comparatively highly sensitive and cost-effective bending measurement can be achieved by detecting deflection-induced intensity change of recoupled cladding modes.
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