Photonic crystal fiber Fabry-Perot interferometers with high-reflectance internal mirrors

Abstract

We demonstrated an in-line micro fiber-optic Fabry-Perot interferometer with an air cavity which was created by multi-step fusion splicing a muti-mode photonic crystal fiber (MPCF) to a standard single mode fiber (SMF). The fringe visibility of the interference pattern was up to 20 dB by reshaping the air cavity. Experimental results showed that such a device could be used as a highly sensitive strain sensor with the sensitivity of 4.5 pm/μɛ. Moreover, it offered some other outstanding advantages, such as the extremely compact structure, easy fabrication, low cost, and high accuracy.

Keywords

Fiber-optic sensors / Fabry-Perot interferometer / photonic crystal fiber / strain measurement

References

[1] Sirkis J, Berkoff T A, Jones R T, Singh H, Kersey A D, Friebele E J, . In-line fiber etalon (ILFE) fiber-optic strain sensors. Journal of Lightwave Technology, 1995, 13(7): 1256-1263.

[2] Zhu T, Wu D, Liu M, Duan D. In-line fiber optic interferometricsensors in single-mode fibers. Sensors, 2012, 12(8): 10430-10449.

[3] Wang X, Xu J, Zhu Y, Cooper K L, Wang A. All-fused-silica miniature optical fiber tip pressure sensor. Optics Letters, 2006, 31(7): 885-887.

[4] Cibula E, Donlagic D. In-line short cavity Fabry-Perot strain sensor for quasi distributed measurement utilizing standard OTDR. Optics Express, 2007, 15(14): 8719-8730.

[5] Ran Z, Rao Y, Deng H, Liao X. Miniature in-line photonic crystal fiber etalon fabricated by 157 nm laser micromachining. Optics Letters, 2007, 32(21): 3071-3073.

[6] Rao Y, Deng M, Duan D, Yang X, Zhu T, Cheng G. Micro Fabry-Perot interferometers in silica fibers machined by femtosecond laser. Optics Express, 2007, 5(21): 14123-14128.

[7] Jauregui-Vazquez D, Estudillo-Ayala J M, Rojas-Laguna R, Vargas-Rodriguez E, Sierra-Hernandez J M, Hernandez-Garcia J C, . An all fiber intrinsic Fabry-Perot interferometer based on an air-microcavity. Sensors, 2013, 13(5): 6355-6364.

[8] Rao Y, Zhu T, Yang X, Duan D. In-line fiber-optic etalon formed by hollow-core photonic crystal fiber. Optics Letters, 2007, 32(18): 2662-2664.

[9] Deng M, Tang C, Zhu T, Rao Y. PCF-based Fabry-Perot interferometric sensors for strain measurement at high temperatures. IEEE Photonics Technology Letters, 2011, 23(11): 700-703.

[10] Li E, Peng G, Ding X. High spatial resolution fiber-optic Fizeau interferometric strain sensor based on all-fiber spherical microcavity. Applied Physics Letters, 2008, 92, 101117-1-101117-3.

[11] Antunes P F C, Domingues M F F, Alberto N J, Andre P S. Optical fiber micro-cavity strain sensors produced by the catastrophic fuse effect. IEEE Photonics Technology Letters, 2014, 26(1): 78-81.

[12] Favero F C, Araujo L, Bouwmans G, Finazzi V, Villatoro J, Pruneri V. Spheroidal Fabry-Perot microcavities in optical fibers for high-sensitivity sensing. Optics Express, 2012, 20(7): 7112-7118.

[13] Xiao L, Demokan M S, Jin W, Wang Y, Zhao C. Fusion splicing photonic crystal fibers and conventional single-mode fibers: microhole collapse effect. Journal of Lightwave Technology, 2007, 25(11): 3563-3574.