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A fiber inline interferometric refractive index(RI) sensor consisting of a microchannel and a fiber taper is proposed in this letter. The microchannel is fabricated by combining femtosecond laser micromachining and arc fusion splicing. No subsequent chemical etching process is needed. Three sensors with microchannel widths of 4, 8, and 10 μm are prepared. The sensitivity in the RI range from 1.33 to 1.35 is up to361.29 nm/RIU at the microchannel width of 8 μm. The sensitivity is 20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors.

Fiber inline interferometric refractive index sensors fabricated by femtosecond laser and fusion splicing