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A novel temperature sensor based on up-taper and single mode–multimode fiber has been presented and demonstrated in this letter. The sensor is fabricated by fusing an up-taper in a single mode fiber (SMF) and splicing the SMF with a section of multimode fiber. In the taper region, a part of light is propagated from the fiber core into the cladding and a series of high-order modes are excited. The...
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