All-fiber Mach-Zehnder curvature sensor based on multimode interference combined with a long-period grating |
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Authors: | Frazão O Viegas J Caldas P Santos J L Araújo F M Ferreira L A Farahi F |
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Institution: | INESC Porto, Rua do Campo Alegre 687, Portugal. ofrazao@inescporto.pt |
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Abstract: | A novel Mach-Zehnder interferometer based on a fiber multimode interference structure combined with a long-period fiber grating (LPG) is proposed. The multimode interference is achieved through the use of a MMF section spliced between two single-mode fibers, with a length adjusted to couple a fraction of light into the cladding modes. A LPG placed after the MMF couples light back into the fiber core, completing the Mach-Zehnder interferometer. This novel configuration was demonstrated as a bending sensor. |
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