10 January 2018 Double-sideband heterogeneous pulse modulation method for distributed acoustic sensing
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Proceedings Volume 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications; 1061807 (2018) https://doi.org/10.1117/12.2295651
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China
Abstract
In this paper, a double-sideband heterogeneous with suppressed carrier (DSBH-SC) pulse modulation method for fiber-optic distributed acoustic sensing is proposed. An electro-optic in-phase/quadrature (I/Q) modulator is used to realize carrier-suppressed double-sideband heterogeneous pulse modulation in which the positive and the negative optical sidebands can carry independent modulation signals. Due to the modulation curve of the electro-optic I/Q modulator irregularly, the factors that influence the performance of the DSBH-SC are analyzed from modulation amplitude and frequency. The analysis shows that the constant frequency modulation on the lower optical sideband while a stable wide band linear frequency chirping on the upper optical sideband can be obtain in appropriate modulation conditions. It presents a method of digital subcarrier modulation for distributed optical sensing.
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Zhe Ma, Zhe Ma, Junfeng Jiang, Junfeng Jiang, Shuang Wang, Shuang Wang, Kun Liu, Kun Liu, Wenjie Chen, Wenjie Chen, Xuezhi Zhang, Xuezhi Zhang, Zhenyang Ding, Zhenyang Ding, Tiegen Liu, Tiegen Liu, } "Double-sideband heterogeneous pulse modulation method for distributed acoustic sensing", Proc. SPIE 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications, 1061807 (10 January 2018); doi: 10.1117/12.2295651; https://doi.org/10.1117/12.2295651
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