Journal
CHINESE OPTICS LETTERS
Volume 11, Issue 11, Pages -Publisher
CHINESE LASER PRESS
DOI: 10.3788/COL201311.110603
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Funding
- National 973 Program of China [2011CB013000]
- National Natural Science Foundation of China [90923039, 51105038]
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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 Am are prepared. The sensitivity in the RI range from 1.33 to 1.35 is up to similar to 361.29 nm/RIU at the microchannel width of 8 pan. The sensitivity is similar to 20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors.
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