Chinese Optics Letters, 2015, 13 (1): 010401, Published Online: Jan. 4, 2015   

Optical fiber acoustic sensing multiplexing system based on TDM/SFDM Download: 824次

Author Affiliations
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
Abstract
We propose a system of time-division multiplexing (TDM) and spatial frequency-division multiplexing (SFDM). Extrinsic Fabry–Perot interferometric sensors are applied to detect weak acoustic signals. The broadband source is employed, the light from it is modulated by a pulse signal sequence and is efficiently amplified by semiconductor optical amplifiers. Experimental results show that the equivalent noise pressure spectrum level is -97.2 dB re 1 rad/vHz below 1250 Hz, and the cross talk between two sensors in one TDM channel is -32.7 dB with a cavity length difference of 60 μm. The number of sensors in this multiplexing system can theoretically reach 160.
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Jiehui Xie, Fuyin Wang, Yao Pan, Zhengliang Hu, Yongming Hu. Optical fiber acoustic sensing multiplexing system based on TDM/SFDM[J]. Chinese Optics Letters, 2015, 13(1): 010401.

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