Temperature Insensitive All-Fiber Compact Polarization-Maintaining Photonic Crystal Fiber Based Interferometer and Its Applications in Fiber Sensors

A novel temperature insensitive all-fiber compact polarization-maintaining photonic crystal fiber (PMPCF) based interferometer was presented. The coupling between the PMPCF and single mode fiber (SMF) was investigated experimentally and analytically. With an all-fiber compact SMF-PMPCF-SMF structure, the cladding modes propagating in the PMPCF can be effectively excited by finely core-offsetting one splice between the PMPCF and SMF. With the increase of the core-offset, the interference depth of the interference pattern enlarges accordingly. Under a suitable core-offset, the PMPCF based interferometer with high interference depth can be obtained. Moreover, it is temperature insensitive due to its ultra-low thermal characteristics. We also demonstrated its applications in strain and refractive index measurement. The sensors have the advantages of small size, simple and compact all fiber structure, high sensitivity, and temperature insensitiveness.

[1]  Dong Bo,et al.  Liquid-level sensor with a high-birefringence-fiber loop mirror. , 2006, Applied optics.

[2]  Bo Dong,et al.  Temperature- and phase-independent lateral force sensor based on a core-offset multi-mode fiber interferometer. , 2008, Optics express.

[3]  L. Zenteno,et al.  All-fiber absolute temperature sensor using an unbalanced high-birefringence Sagnac loop. , 1997, Optics letters.

[4]  Li Wei,et al.  Core-offset small-core-diameter dispersion compensation fiber interferometer and its applications in fiber sensors. , 2009, Applied optics.

[5]  Dong Xiao-yi,et al.  Mode Exciting Properties of Photonic Crystal Fibres with the Optical Field Incident from a Single Mode Fibre , 2006 .

[6]  Jianguo Liu,et al.  Large anomalous dispersion at short wavelength and modal properties of a photonic crystal fiber with large air holes , 2006, IEEE Journal of Quantum Electronics.

[7]  Xinhuan Feng,et al.  High-birefringence fiber loop mirrors and their applications as sensors. , 2005, Applied optics.

[8]  Hwa-Yaw Tam,et al.  Temperature-insensitive strain sensor with polarization-maintaining photonic crystal fiber based Sagnac interferometer , 2007 .

[9]  Youngjoo Chung,et al.  High temperature fiber sensor with high sensitivity based on core diameter mismatch. , 2008, Optics express.

[10]  B.J. Eggleton,et al.  Cladding-mode-resonances in air-silica microstructure optical fibers , 2000, Journal of Lightwave Technology.

[11]  Li Wei,et al.  Low-cost high-sensitivity strain and temperature sensing using graded-index multimode fibers. , 2007, Applied optics.

[12]  M.S. Demokan,et al.  Temperature-insensitive Interferometer using a highly birefringent photonic Crystal fiber loop mirror , 2004, IEEE Photonics Technology Letters.