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A temperature-insensitive fiber-optic displacement sensing scheme by cascading the fiber up taper and Bragg grating is experimentally demonstrated. The strength-robust up taper, which is fabricated by excessively splicing the Bragg grating to the interrogation fiber, functions as the bridge between the core mode and the cladding modes. This cascading structure realizes the cladding-mode backward recoupling,...
Displacement sensor based on the cladding modes recoupling by using fiber up taper cascaded with chirped fiber Bragg grating is demonstrated. The reflection power difference reaches 135 μW within displacement change of 3750 μm.
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