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Cost-Effective Fiber Multiplexing System Based on low coherence Interferometers and Application to Temperature Measurement

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Photonic Sensors 2016年第4期6卷 318-323页

作者： Meng JIANG Zhongze ZHAO Kun LI Zeming WANG Yage ZHAN Hongying ZHOU Fu YANG College of Science Donghua University of China Shanghai 201620 China

Based on the low-coherence interferometric principles, a cost-effective all-fiber Mach-Zehnder multiplexing system is proposed and demonstrated. The system consists of two interferometers： sensing interferometer and demodulation interferometer. By scanning an optical tunable delay line back and forth constantly with a stable speed, sensing fibers with different optical paths can be temporal interrogated. The system is experimentally proved to have a high performance with a good stability and low system noises. The multiplexing capacity of the system is also investigated. An experiment of measuring the surrounding temperature is carried out. A sensitivity of 12 gm/℃ is achieved within the range of 20 ℃ to 80 ℃. This low cost fiber multiplexing system has a potential application in the remote monitoring of temperature and strain in building structures, such as bridges and towers.

关键词： Mach-Zehnder interferometer low-coherence multiplexing fiber system

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High Accuracy Measurement of The Dispersion of CFBGs and Discussion on Related Issues

High Accuracy Measurement of The Dispersion of CFBGs and Dis...

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第二届国际测量仪器与测试自动化学术会议

作者： Chen Qingshan~(1 2) Lv Naiguang~2 Deng Wenyi~2 Jiang Feng~2 1.School of electronic engineering Beijing University of post & telecommunication 2.School of opto-electronic information & telecpmmunication engineering Beijing Information science & Technology University 100192 China

＜正＞CFBG（Chirped Fiber Bragg Grating）is a passive optical fiber devices with broad application prospect in the chromatic dispersion compensation of optical communication *** precision characterization of the dispersion property of a CFBG is the key to its utilization in this aspect. For this purpose,a low-coherence fiber interferometric system is developed and the principle is *** experiments are carried out and the acquired interferograms are manipulated to obtain the dispersion property of a CFBG. Especially,according to the measurement principle,the error of the system is analyzed,involving error source analysis,error transferring relationship derivation as well as error synthesizing. Based on all these,relative conclusion is drawn.

关键词： CFBG low-coherence Dispersion Measurement Accuracy

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