Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 20, Issue 5-8, Pages 626-628Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2008.919507
Keywords
fiber tapers; long-period grating (LPG); Mach-Zehnder (MZ) interferometer; refractive index (RI) sensor
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A novel refractive index (RI) sensor based on a fiber Mach-Zehnder interferometer was realized by concatenating two single-mode fiber tapers separated by a middle section. The proposed device had a minimum insertion loss of 3 dB and maximum interferometric extinction ratio over 20 dB. The resolution (0.171 nm) of the two-taper sensor to its surrounding RI change (0.01) was found to be comparable to that (0.252 nm) of similar structures made from an identical long-period gratings pair, and its ease of fabrication makes it a low-cost alternative to existing sensing applications.
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