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12 December 2018 Highly nonlinear fiber sensor for distributed monitoring
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Proceedings Volume 10849, Fiber Optic Sensing and Optical Communication; 108490N (2018) https://doi.org/10.1117/12.2504884
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
Abstract
This paper presents a kind of highly nonlinear fiber (HNLF) sensor for distributed monitoring. In order to realize the high performance of the stimulated Brillouin scattering (SBS) in HNLF, the experiments diagram based on the topological structure of Brillouin optical time domain analysis (BOTDA) is optimized through two-stage modulation by two electro optical modulators (EOMs) to realize high extinction ratio. The SBS characteristics of the HNLF have been studied, including the Brillouin gain bandwidth, Brillouin gain center frequency and SBS threshold. It is found that the HNLF has a wider Brillouin gain bandwidth. The SBS threshold of HNLF is larger than that of single mode fiber, which are 78 mW and 7.9 mW respectively. The larger SBS threshold is useful to avoid SBS in some situations that Spontaneous Brillouin Scattering is necessary. Based on the Brillouin gain center frequency, the Brillouin frequency shift coefficients of strain and temperature in HNLF have been studied, which are 0.0308 MHz/με and 0.413 MHz/ °C respectively.
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Yage Zhan, Changheng Feng, Aijin Guo, Nabing Xie, Qinyu Yang, Zeyu Sun, and Muhuo Yu "Highly nonlinear fiber sensor for distributed monitoring", Proc. SPIE 10849, Fiber Optic Sensing and Optical Communication, 108490N (12 December 2018); https://doi.org/10.1117/12.2504884
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