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Simultaneous measurement of temperature and bending-curvature using a single local micro-structured longperiod fiber grating

Cao Ye Pei Yong-Wei Tong Zheng-Rong

Simultaneous measurement of temperature and bending-curvature using a single local micro-structured longperiod fiber grating

Cao Ye, Pei Yong-Wei, Tong Zheng-Rong
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Publishing process
  • Received Date:  21 October 2013
  • Accepted Date:  24 October 2013
  • Published Online:  05 January 2014

Simultaneous measurement of temperature and bending-curvature using a single local micro-structured longperiod fiber grating

  • 1. Key Laboratory of Film Electronics and Communication Devices, School of Computer and Communication Engineering, Tianjin University of Technology, Tianjin 300384, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 61107052) and the Tianjin University’

Abstract: A local micro-structured long-period fiber grating (LMSLPFG) is proposed and investigated experimentally. The LMSLPFG is fabricated by using hydrofluoric acid (HF) to partially etch a standard long-period fiber grating (LPFG), thereby forming a local defect in the cladding. The theoretical analysis and experimental results show that partially etching will change the effective refractive index modulation in the cladding mode, which equivalently introduces a phase shift into the part of defect and manifests, in the spectrogram, as openning a transmission window between the stopbands, forming two transmission stopbands and one transmission passband. On this basis we study the temperatures and bending characteristics of the two stopbands and one passband. The results show that the temperature sensitivities of the two stopbands and one passband are all approximately 0.05 nm/℃; the bending sensitivity of the passband (2.61 nm/m-1) is less than those of two stopbands (4.71 nm/m-1). Thus by using the sensitive matrix, we can simultaneously measure the curvature and temperature, with only one grating used.

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