Abstract
A multimode interference (MMI) fiber optics angle sensor based on a cyclic transparent amorphous fluoropolymer (CYTOP) multimode fiber is reported Two silica single-mode fibers (SMFs) are glued to a segment of CYTOP fiber to form a single-mode-multimode-single-mode structure that produces an MMI spectrum. The centers of the SMF and the CYTOP fiber are aligned using the translation stage of the fiber fusion splicer in manual mode. The angle sensing mechanism based on MMI theory is investigated and experimentally verified. A large measurement range of 110° and a linear sensitivity of 36.2 pm/deg is demonstrated. The angle measurement is humidity-insensitive due to the weak moisture absorption of the CYTOP fiber and the design of sensor packaging.
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