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In-fiber Mach-Zehnder interferometer based on fiber core etched air-bubble and core diameter mismatch for liquid refractive index sensing

Li Hui-Dong Fu Hai-Wei Shao Min Zhao Na Qiao Xue-Guang Liu Ying-Gang Li Yan Yan Xu

In-fiber Mach-Zehnder interferometer based on fiber core etched air-bubble and core diameter mismatch for liquid refractive index sensing

Li Hui-Dong, Fu Hai-Wei, Shao Min, Zhao Na, Qiao Xue-Guang, Liu Ying-Gang, Li Yan, Yan Xu
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Publishing process
  • Received Date:  15 May 2013
  • Accepted Date:  24 June 2013
  • Published Online:  05 November 2013

In-fiber Mach-Zehnder interferometer based on fiber core etched air-bubble and core diameter mismatch for liquid refractive index sensing

  • 1. Ministry of Education Key Laboratory on Photoelectric oil-gas Logging and detecting, School of Science, Xi’an Shiyou University, Xi’an 710065, China;
  • 2. Department of Physics, Northwest University, Xi’an 710069, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. F050304, F0502, 61240028), the National High Technology Research and Development Program of China (Grant No. 2009AA06Z203), and the Research Foundation of Education Bureau of Shaanxi Province, China (Grant No. 12JS077).

Abstract: A kind of optical fiber liquid refractive index sensor is proposed based on fiber core etched air-bubble and core diameter mismatched in-fiber Mach-Zehnder interferometer. A core etched standard single-mode fiber is spliced to another core etched standard single-mode fiber (SMF) to form an air bubble at the connecting point, and a 20 mm thinned fiber is cascaded (TCF) by fusion splicing method, which is 20 mm apart from the bubble, then a leading-mode fiber is spliced to the thinned fiber to form a structure of SMF-(air-bubble)-SMF-TCF-SMF in-fiber Mach-Zehnder interferometer liquid refractive index sensor. The air-bubble and the two fiber core diameter mismatched points serve as optical couplers for modes conversion. The transmission spectrum of sensor is studied by experiment. Results shows that the peak power changes with respect to surrounding refractive index with good linearity. The sensitivity of the sensor is 142.537 dB/RIU in the range of 1.3511.402 with linearity of 0.996, making it a good candidate for bio-chemical measurements.

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