Optimized coupling loss between single mode fiber and hollow-core photonic crystal fiber for Raman gas detection
Received:May 02, 2017  Revised:September 15, 2017  download
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Author NameAffiliationE-mail
ZHANG Xiu-Mei College of Electrical Engineering and Control ScienceNanjing Tech University bhldhd2016@163.com 
JIANG Shu-Bo Nanjing Tech University,College of Electrical Engineering and Control Science jiangshubo@njtech.edu.cn 
WANG Xu Nanjing Tech University,College of Electrical Engineering and Control Science  
Abstract:In this investigation, the coupling losses caused by Fresnel reflection, core misalignment between single mode fiber (SMF) and HC-PCF are analyzed. A novel solution proposed from this research will reduce the coupling losses by using a T-type tube as a connector. Meanwhile, the theoretically calculated optimized gaps are at 15 μm in SMF-HCPCF direction and 25 μm in HCPCF-SMF direction. Thus, an experiment has been carried out, and the results of the practical gap in the above mentioned two directions have also been obtained. Furthermore, compared with detection by traditional methods, the proposed new detection method with PCF can remarkably enhance the Raman spectroscopy signal. Finally, the prospect of using the combination of HC-PCF and Raman spectroscopy in gas-cell detection has been demonstrated by using oxygen and nitrogen.
keywords:hollow-core photonic crystal fiber, single mode fiber, coupling loss, fresnel reflection, gas detection
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Copyright:《Journal of Infrared And Millimeter Waves》