Highly Strain and Bending Sensitive Microtapered Long-Period Fiber Gratings

A microtapered long-period fiber grating (MTLPFG) is fabricated successfully by periodically tapering a standard single-mode fiber with CO2 laser heating source. This can be done by taking advantage of that the effective index difference between the core mode and the cladding modes is changed periodically during microtapering. High fabrication reproducibility and MTLPFGs quality can be achieved by this CO2 laser-heater-based fabrication scheme. In addition, the strain, bending, and liquid-level sensing characteristics of the MTLPFGs are investigated experimentally. Compared with the conventional long-period fiber gratings, it is found that the strain and bending sensitivities of fabricated MTLPFGs are improved by factors of about 10 and 5, respectively. Considering the simple and flexible fabrication process as well as the high quality and sensitivity of fabricated MTLPFGs, we believe that this may offer a simpler and alternative choice to current filters or sensing applications.

[1]  K. Morishita,et al.  Fabrication and resonance wavelengths of long-period gratings written in a pure-silica photonic crystal fiber by the glass structure change , 2004, Journal of Lightwave Technology.

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

[3]  G. Rego,et al.  Arc-Induced Long-Period Gratings , 2005 .

[4]  K. Hirao,et al.  Fabrication of long-period fiber gratings by focused irradiation of infrared femtosecond laser pulses. , 1999, Optics letters.

[5]  Georges Humbert,et al.  Electric-arc-induced gratings in non-hydrogenated fibres: fabrication and high-temperature characterizations , 2002 .

[6]  Yiping Wang,et al.  Asymmetric long period fiber gratings fabricated by use of CO2 laser to carve periodic grooves on the optical fiber , 2006 .

[7]  Byoung Yoon Kim,et al.  Long-period fiber gratings based on periodic microbends. , 1999, Optics letters.

[8]  Y. Rao,et al.  Novel fiber-optic sensors based on long-period fiber gratings written by high-frequency CO/sub 2/ laser pulses , 2003 .

[9]  U. Paek,et al.  Azimuthally symmetric long‐period fiber gratings fabricated with CO2 laser , 2004 .

[10]  C. Liao,et al.  Long Period Fiber Gratings Inscribed by Periodically Tapering a Fiber , 2014, IEEE Photonics Technology Letters.

[11]  Gaspar M. Rego,et al.  Arc-Induced Long Period Fiber Gratings , 2016, J. Sensors.

[12]  V. Grubsky,et al.  Fabrication of Axially Symmetric Long-Period Gratings With a Carbon Dioxide Laser , 2006, IEEE Photonics Technology Letters.

[13]  Jian Zhao,et al.  Long-period grating fabricated by periodically tapering standard single-mode fiber. , 2008, Applied optics.

[14]  Ian Bennion,et al.  Sensitivity characteristics of long-period fiber gratings , 2002 .

[15]  Jian Liang,et al.  Online fabrication scheme of helical long-period fiber grating for liquid-level sensing. , 2016, Applied optics.

[16]  T A Birks,et al.  Miniature all-fiber devices based on CO(2) laser microstructuring of tapered fibers. , 2001, Optics letters.

[17]  Jose Luis Santos,et al.  Simultaneous measurement of temperature and strain based on arc-induced long-period fibre gratings , 2005 .

[18]  E. Dianov,et al.  High-temperature stability of long-period fiber gratings produced using an electric arc , 2001 .

[19]  Weigang Zhang,et al.  Asymmetrically Corrugated Long-Period Gratings by Burning Fiber Coating and Etching Cladding , 2013, IEEE Photonics Technology Letters.

[20]  Wojtek J. Bock,et al.  Increasing sensitivity of arc-induced long-period gratings—pushing the fabrication technique toward its limits , 2010 .

[21]  G. Rego,et al.  Tomographic stress profiling of arc-induced long-period fiber gratings , 2005, Journal of Lightwave Technology.

[22]  A. Cusano,et al.  Long-Period Gratings in Hollow Core Fibers by Pressure-Assisted Arc Discharge Technique , 2011, IEEE Photonics Technology Letters.

[23]  Predrag Mikulic,et al.  A Novel Fiber-Optic Tapered Long-Period Grating Sensor for Pressure Monitoring , 2007, IEEE Transactions on Instrumentation and Measurement.

[24]  S. James,et al.  Fiber-optic liquid-level sensor using a long-period grating. , 2001, Optics letters.

[25]  V. Bhatia.  Applications of long-period gratings to single and multi-parameter sensing. , 1999, Optics express.