A novel quasi-distributed sensing network based on non-balance Mach-Zehnder autocorrelator

Jun Yang; Yonggui Yuan; Ai Zhou; Libo Yuan

doi:10.1117/12.885657

17 May 2011 A novel quasi-distributed sensing network based on non-balance Mach-Zehnder autocorrelator

Jun Yang, Yonggui Yuan, Ai Zhou, Libo Yuan

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77530P (2011) https://doi.org/10.1117/12.885657
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

We develop and demonstrate a non-balance Mach-Zehnder autocorrelator based quasi-distributed sensing network. A three-port optical fiber circulator is used to connect broadband light source, sensor array and autocorrelator, avoiding reflective light from sensor array reentering into the light source. At detection location, a balanced detection approach is employed for restraining beat noise of the low coherent interferometric sensing network by respectively connecting two photodetectors to the two output ports of the Mach-Zehnder autocorrelator. The characteristics of the unidirectional transmission and differential output detection can at least double the effective efficiency of the light source power. The optimization and signal-to-noise of the sensing system are theoretically discussed, and a thirteen-sensor network is experimentally demonstrated. The full-fiber and common-path sensing system with high signal-to-noise is quite suitable for quasi-distributed measurement of strain and temperature in smart structures.

Citation Download Citation

Jun Yang, Yonggui Yuan, Ai Zhou, and Libo Yuan "A novel quasi-distributed sensing network based on non-balance Mach-Zehnder autocorrelator", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77530P (17 May 2011); https://doi.org/10.1117/12.885657

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