Investigation of Temperature Sensitivity of a Polymer-Overlaid Microfiber Mach-Zehnder Interferometer

The temperature sensitivity of the free spectral range (FSR) for a polymer-overlaid microfiber Mach-Zehnder interferometer (MZI) is investigated both theoretically and experimentally. The waist diameter of the optical microfiber can be controlled to alter the thermal expansion and optic properties of the polymer-coated MZI. Inserting an optical microfiber with a strong evanescent field into the MZI, a low index polymer with high thermal characteristics is deposited on the surface of the microfibers to realize a polymer-overlaid microfiber MZI. It was found that the thermal expansion factor in the proposed MZI plays an important role in the temperature sensitivity of the FSR. The temperature sensitivity of the polymer-overlaid microfiber MZI is improved, which is measured to be −8.29 nm/°C at 25 °C. The optical transmission spectrum of the polymer-overlaid microfiber MZI is converted to the spatial frequency spectrum via fast Fourier transform. The temperature sensitivity of the spatial frequency in the proposed polymer-overlaid MZI is estimated to be 18.31 pm−1 °C−1, which is 17 times higher than that of the microfiber MZI without polymer coating (1.04 pm−1 °C−1).

[1]  A. Zhang,et al.  Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor , 2005, IEEE Photonics Technology Letters.

[2]  P. Lu,et al.  Fiber in-line Mach-Zehnder interferometer fabricated by femtosecond laser micromachining for refractive index measurement with high sensitivity , 2010 .

[3]  T. Birks,et al.  Shape of fiber tapers , 1992 .

[5]  Eun‐Kee Park,et al.  Stiffness Comparison of Tissue Phantoms using Optical Coherence Elastography without a Load Cell , 2017 .

[6]  Jianchun Yang,et al.  An in-line Mach-Zehnder Interferometer Using Thin-core Fiber for Ammonia Gas Sensing With High Sensitivity , 2017, Scientific Reports.

[7]  Ying Wang,et al.  Bidirectional Bend Sensor Employing a Microfiber-Assisted U-Shaped Fabry-Perot Cavity , 2017, IEEE Photonics Journal.

[8]  Kok-Sing Lim,et al.  Current sensor based on microfiber knot resonator , 2011 .

[9]  Haitao Li,et al.  In-Line Mach–Zehnder Interferometric Sensor Based on a Seven-Core Optical Fiber , 2017, IEEE Sensors Journal.

[10]  Young-Geun Han,et al.  Development of a small-size embedded optical microfiber coil resonator with high Q , 2012 .

[11]  Renxi Gao,et al.  High-quality Mach-Zehnder interferometer based on a microcavity in single-multi-single mode fiber structure for refractive index sensing. , 2017, Applied optics.

[12]  Yuhang Li,et al.  Mach-Zehnder interferometers assembled with optical microfibers or nanofibers. , 2008, Optics letters.

[13]  Hui Ding,et al.  Temperature Insensitive Magnetic Field Sensor Based on Ferrofluid Clad Microfiber Resonator , 2014, IEEE Photonics Technology Letters.

[14]  Vahid Ahsani,et al.  Bragg Grating Embedded in Mach-Zehnder Interferometer for Refractive Index and Temperature Sensing , 2016, IEEE Photonics Technology Letters.

[15]  Yong Zhao,et al.  Recent advancements in optical fiber hydrogen sensors , 2017 .

[16]  C. Liao,et al.  Femtosecond laser fabricated fiber Bragg grating in microfiber for refractive index sensing. , 2010, Optics letters.

[17]  Tingyun Wang,et al.  Single-mode tapered optical fiber for temperature sensor based on multimode interference , 2011, 2011 Asia Communications and Photonics Conference and Exhibition (ACP).

[18]  Young-Geun Han,et al.  Simultaneous Measurement of Strain and Temperature by Using a Micro-Tapered Fiber Grating , 2012, Journal of Lightwave Technology.

[19]  Linjie Zhou,et al.  Characterization of DNA optical microfiber devices fabricated by drawing , 2011, CLEO: 2011 - Laser Science to Photonic Applications.

[20]  Zhilin Xu,et al.  Highly sensitive strain sensor based on helical structure combined with Mach-Zehnder interferometer in multicore fiber , 2017, Scientific Reports.

[21]  Bai-Ou Guan,et al.  Microfiber Mach-Zehnder interferometer based on long period grating for sensing applications. , 2013, Optics express.

[22]  Jixuan Wu,et al.  Characterization of Temperature-Dependent Refractive Indices for Nematic Liquid Crystal Employing a Microfiber-Assisted Mach–Zehnder Interferometer , 2017, Journal of Lightwave Technology.

[23]  Xiaoyi Bao,et al.  Recent Developments in Micro-Structured Fiber Optic Sensors , 2017 .

[24]  Deming Liu,et al.  Refractive index sensor using microfiber-based Mach-Zehnder interferometer. , 2012, Optics letters.

[25]  J. Yang,et al.  Fiber Mach-Zehnder interferometer based on microcavities for high-temperature sensing with high sensitivity. , 2011, Optics letters.

[26]  Tao Zhu,et al.  In-fiber Mach–Zehnder interferometer formed by large lateral offset fusion splicing for gases refractive index measurement with high sensitivity , 2011 .

[27]  H. Arof,et al.  Inline Microfiber Mach–Zehnder Interferometer for High Temperature Sensing , 2013, IEEE Sensors Journal.

[28]  C. Liao,et al.  Microfiber in-line Mach-Zehnder interferometer for strain sensing. , 2013, Optics letters.

[29]  Horacio Lamela,et al.  High-sensitivity ultrasound interferometric single-mode polymer optical fiber sensors for biomedical applications. , 2009, Optics letters.