Volume 10 Issue 6
Dec.  2017
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LI Qiu-shun, XIANG Dong, MENG Qing-jun, YANG Jun-hui, SHI Jian-guo, DONG Wen-fei. Design and test of transmission mode measurement device based on long period fiber grating with a single end face[J]. Chinese Optics, 2017, 10(6): 783-789. doi: 10.3788/CO.20171006.0783
Citation: LI Qiu-shun, XIANG Dong, MENG Qing-jun, YANG Jun-hui, SHI Jian-guo, DONG Wen-fei. Design and test of transmission mode measurement device based on long period fiber grating with a single end face[J]. Chinese Optics, 2017, 10(6): 783-789. doi: 10.3788/CO.20171006.0783

Design and test of transmission mode measurement device based on long period fiber grating with a single end face

doi: 10.3788/CO.20171006.0783
Funds:

National Natural Science Foundation of China 61340032

National Natural Science Foundation of China 61535010

Key Research Program of the Chinese Academy of Sciences KFZD-SW-204

Natural Science Foundation of Jiangsu Province BE2015601

Natural Science Foundation of Shandong Province ZR2012CM029

Research Development Program of Shandong Province 2015GSF117024

the Science and Technology Department of Suzhou City SS201539

the Science and Technology Department of Suzhou City ZXY201434

the 863 Program 2015AA021005

More Information
  • Corresponding author: DONG Wen-fei, E-mail:wenfeidong@sibet.ac.cn
  • Received Date: 11 Sep 2017
  • Rev Recd Date: 13 Nov 2017
  • Publish Date: 01 Dec 2017
  • In this paper, a type of refractive index sensor based on a single end face long period fiber grating(LPFG) with transmission spectra is designed. First, an optical fiber joint at the input end of a 2×2 single-mode fiber coupler is connected with the light source, and the two optical fiber joints at the output end are connected with an optical spectrum analyzer and an optical fiber joint of LPFG respectively. Then, the reflective silver film is sputtered on the other end face of the optical fiber containing LPFG. Finally, a series of glycerol aqueous solutions with different refractive indices are used as the liquid medium to be measured to investigate the similarities and differences between the response spectra of LPFG in direct transmission mode and the single-end silver film mode. The experimental results show that although the single end face is adopted, the corresponding response spectra of LPFG is still in the form of transmission spectra. Moreover, for the same liquid, LPFG with the single end face silver film and LPFG in the direct transmission mode have nearly the same resonance wavelength value. However, there is a certain difference between their optical losses. In the 0~80% glycerol solutions, the optical loss in direct transmission mode changes from -12.92 dB to -16.28 dB and then gradually to -13.22 dB. However, the optical loss gradually changes from -13.13 dB to -13.74 dB and then to -11.45 dB in the case of the single end face silver film mode. Compared with the direct transmission mode, there is a better linear relationship between the relative optical loss and the glycerol concentration of LPFG based on a single end face silver film. The LPFG measurement system designed in this study uses a single end face probe to detect the environmental medium, making it more flexible and convenient in measurement. It is well suited for refractive index measurement in long-distance, harsh environments or deep liquid environments.

     

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