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long period fiber gratings Written in Photonic Crystal fibers by Use of CO2 Laser

Photonic Sensors 2013年第3期3卷 193-201页

作者： Yiping WANG Changrui LIAO Xiaoyong ZHONG Jiangtao ZHOU Yingjie LIU Zhengyong LI Guanjun WANG Kaiming YANG Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province ShenzhenUniversity Shenzhen 518060 China

Photonic crystal fibers are usually divided into two different types of fibers： solid-core photonic crystal fibers （PCFs） and air-core photonic bandgaps fibers （PBFs）. We presented the fabrication methods and applications of long period fiber gratings （LPFGs） written in these two types of photonic crystal fibers by use of a CO2 laser. A stain sensor with a high sensitivity was demonstrated by use of an LPFG written in solid-core PCFs. An in-fiber polarizer based on an LPFG was fabricated by use of a focused CO2 laser beam to notch periodically on a PCF. A novel LPFG was written in an air-core PBF by use of a CO2 laser to collapse periodically air holes in the fiber cladding.

关键词： long period fiber gratings fiber Bragg gratings photonic crystal fibers photonic bandgap fibers CO2 lasers

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Post-Treatment Techniques for Enhancing Mode-Coupling in long period fiber gratings Induced by CO2 Laser

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Photonic Sensors 2015年第4期5卷 339-344页

作者： Xizhen XU Jian TANG Jing ZHAO Kaiming YANG Cailing FU Qiao WANG Shen LIU Changrui LIAO Jiarong LIAN Yiping WANG Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province ShenzhenUniversity Shenzhen 518060 China

Two promising post-treatment techniques, i.e. applying tensile strain and rising temperature, are demonstrated to enhance the mode-coupling efficiency of the CO2-1aser-induced long period fiber gratings （LPFGs） with periodic grooves. Such two post-treatment techniques can be used to enhance the resonant attenuation of the grating to achieve a LPFG-based filter with an extremely large attenuation and to tailor the transmission spectrum of the CO2-1aser-induced LPFG after grating fabrication.

关键词： long period fiber gratings fiber Bragg gratings optical fiber sensor temperature tensile strain opticalfiber device.

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A Novel Fabrication Technique of long period fiber gratings

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Chinese Journal of Lasers 1998年第6期 22-25页

作者： AI Jiang YE Ailun LIU Yuqiao (The State Key Laboratory on Local fiber optic Communication Networks and Advanced Optical fiber Communication Systems, Shanghai Jiaotong University, Shanghai 200030, China)CHEN Yixin LI Changmin (Department of App

１ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｔｈｅｄｉｓｃｏｖｅｒｙｏｆｐｈｏｔｏｓｅｎｓｉｔｉｖｉｔｙｉｎｇｅｒｍａｎｏｓｉｌｉｃａｔｅｏｐｔｉｃａｌｆｉｂｅｒｓｂｙＨｉｌｅｔａｌ．ｉｎ１９７８［１］，ｓｉｇｎｉｆｉｃａｎ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｔｈｅｄｉｓｃｏｖｅｒｙｏｆｐｈｏｔｏｓｅｎｓｉｔｉｖｉｔｙｉｎｇｅｒｍａｎｏｓｉｌｉｃａｔｅｏｐｔｉｃａｌｆｉｂｅｒｓｂｙＨｉｌｅｔａｌ．ｉｎ１９７８［１］，ｓｉｇｎｉｆｉｃａｎｔｐｒｏｇｒｅｓｈａｓｂｅｅｎｍａ...

关键词： long period fiber gratings propagation constant periodic V groove fiber

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High Sensitive long period fiber Grating Sensor for Detection of Nitrite

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Chemical Research in Chinese Universities 2009年第5期25卷 624-627页

作者： QIAN Ying YU Yong-sen LI Qiu-shun WU Si-zhu ZHAO Kai-jun YANG Bai-liang ZHANG Yu-shu State Key Laboratory on Integrated Optoelectronies College of Electronic Science and Engineering College of Chemistry Jilin University Changchun 130012 P R. China Electrical Diagnosis Division China-Japan Union Hospital Jilin University Changchun 130033 P R. China

A high sensitive long period fiber grating（LPFG） sensor for the detection of nitrite is proposed, which is realized by coating multiple poly（sodium 4-styrensulfonate）（PSS） and poly（diallyldimethylammonium） chloride （PDDA） layers on the fiber grating surface. The sensitivity of this LPFG sensor is maximum when the number of assembled layers is 70. Under this condition, a nitrite concentration of 3×10^-3 mol/L, which is lower than the National Food Additive Standard, 4.2×10^-3 mol/L, can be distinguished. The sensitivity is further increased by 30% when nitrite was determined in the sucrose solution with a concentration of 65%, which provides a new solution for the best refraction index approaching matched index of the fiber cladding. Compared with chemical methods, this nitrite detection technology offers some advantages, such as high accuracy, non toxicity, high speed, low cost, without chemical reagent, and is suitable for foodstuff security detection.

关键词： long period fiber gratings Refractive index sensor Detection of nitrite

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Applied Optics to Engineering Photonics： a Retrospective

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Photonic Sensors 2011年第4期1卷 295-322页

作者： Ralph P. TATAM Department of Engineering Photonics School of Engineering CranfieM University Cranfield Bedford MK43 OAL UK

This paper provides a short overview of the time I spent as a member of the Applied Optics Group at the University of Kent （1985-1989） followed by a review of my research during my time at Cranfield University （198... 详细信息

关键词： Optical fiber sensors optical instrumentation laser velocimetry speckle interferometry fiber Bragggratings long period fiber gratings optical gas sensing optical coherence tomography flow measurement coherentfiber optic bundles

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