Inline fiber interference-based refractive-index sensor

Abstract. We report two fiber multiple-mode interferometers formed in photonic crystal fiber (PCF). The interference between the core and the cladding modes of a PCF is utilized. We use two methods to form a coupling point, and the cladding modes are excited from the fundamental core mode. One method is blowing compressed gas into the air holes and discharging at the coupling point; the air holes will expand due to gas expansion in the discharge process. Similarly, the other is discharging at the coupling point after the air is exhausted from the air holes, and the holes will contract during the process. By making another coupling point at a different location along the fiber, the proposed PCF interferometers are implemented. Experimental results show that the sensitivities of the two devices can achieve 1.54 and 1.45 nm for a 0.01 refractive index change.

[1]  D. Monzon-Hernandez,et al.  Compact modal interferometer built with tapered microstructured optical fiber , 2006, IEEE Photonics Technology Letters.

[2]  Zhi Wang,et al.  Long period grating assistant photonic crystal fiber modal interferometer. , 2011, Optics express.

[3]  P. Russell,et al.  Endlessly single-mode photonic crystal fiber. , 1997, Optics letters.

[4]  T A Birks,et al.  Group-velocity dispersion in photonic crystal fibers. , 1998, Optics letters.

[5]  B. Lee,et al.  Mach-Zehnder interferometer formed in a photonic crystal fiber based on a pair of long-period fiber gratings. , 2004, Optics letters.

[6]  Jonathan Knight,et al.  Large mode area photonic crystal fiber , 1998 .

[7]  Daru Chen,et al.  Refractive index sensor based on Mach–Zehnder interferometer formed by two cascaded single mode fiber corners , 2014 .

[8]  E.C.M. Pennings,et al.  Optical multi-mode interference devices based on self-imaging: principles and applications , 1995 .

[9]  Philip S. Russell,et al.  Designing a photonic crystal fiber with flattened dispersion , 1999, Other Conferences.

[10]  A. Mehta,et al.  Wavelength tunable fiber lens based on multimode interference , 2004, Journal of Lightwave Technology.

[11]  X. Bao,et al.  Dependence of the brillouin frequency shift on strain and temperature in a photonic crystal fiber. , 2004, Optics letters.

[12]  Qian Wang,et al.  Investigation on Single-Mode–Multimode– Single-Mode Fiber Structure , 2008, Journal of Lightwave Technology.

[13]  Qiang Wu,et al.  High sensitivity SMS fiber structure based refractometer--analysis and experiment. , 2011, Optics express.

[14]  Benjamin J. Eggleton,et al.  Ultra-sensitive photonic crystal fiber refractive index sensor , 2009 .

[15]  R McPhedran,et al.  Dispersion management with microstructured optical fibers: ultraflattened chromatic dispersion with low losses. , 2003, Optics letters.

[16]  Frederick E. Petry,et al.  Principles and Applications , 1997 .

[17]  Bong-Ahn Yu,et al.  Highly sensitive strain and bending sensor based on in-line fiber Mach–Zehnder interferometer in solid core large mode area photonic crystal fiber , 2010 .

[18]  Rajan Jha,et al.  Refractometry based on a photonic crystal fiber interferometer. , 2009, Optics letters.

[19]  H. Choi,et al.  All-fiber Mach-Zehnder type interferometers formed in photonic crystal fiber. , 2007, Optics express.

[20]  Jonathan Knight,et al.  Large mode area photonic crystal fibre , 1998 .

[21]  Joel Villatoro,et al.  Holey fiber tapers with resonance transmission for high-resolution refractive index sensing. , 2005, Optics express.

[22]  All‐fiber temperature sensor based on few mode fiber and single‐mode fiber , 2013 .

[23]  Zhenfeng Gong,et al.  Miniature Fiber-Optic Strain Sensor Based on a Hybrid Interferometric Structure , 2013, IEEE Photonics Technology Letters.