Author:
Wu Haoting,Guo Wencun,Zhong Zixuan,Yin Guolu,Liu Tao,Zhu Tao
Abstract
AbstractWe report the numerical and experimental studies of the two-dimensional Brillouin gain spectrum (BGS) distribution deformation induced by the self-phase modulation in the Brillouin optical time domain reflectometry (BOTDR) with a 20.6 km sensing distance. The BGS distribution deformation is investigated by analyzing the evolution of the point spread function along the fiber in the two-dimensional model of the BOTDR. In the simulation and experimental results, the specific deformation degree of the BGS distribution induced by the self-phase modulation is related to the pump pulse profile, pump pulse peak power, BGS demodulation method, and detected scattered light component. By comprehensively analyzing the evolution of the point spread function induced by the self-phase modulation and using the image deconvolution, a typical BOTDR sensor with a 25 ns pump pulse reaches the 20 cm spatial resolution over the 20.6 km sensing fiber.
Publisher
Springer Science and Business Media LLC
Reference20 articles.
1. J. Luo, Y. Hao, Q. Ye, Y. Hao, and L. Li, “Development of optical fiber sensors based on Brillouin scattering and FBG for on-line monitoring in overhead transmission lines,” Journal of Lightwave Technology, 2013, 31(10): 1559–1565.
2. C. C. Zhang, H. H. Zhu, S. P. Liu, B. Shi, and D. Zhang, “A kinematic method for calculating shear displacements of landslides using distributed fiber optic strain measurements,” Engineering Geology, 2018, 234: 83–96.
3. R. G. Smith, “Optical power handling capacity of low loss optical fibers as determined by stimulated Raman and Brillouin scattering,” Applied Optics, 1972, 11(11): 2489–2494.
4. M. F. Stella and T. Luc, “Impact of Raman scattering and modulation instability on the performances of Brillouin sensors,” in 21st International Conference on Optical Fiber Sensors, Ottawa, Canada, 2011, pp. 1450–1453.
5. M. N. Alahbabi, Y. T. Cho, T. P. Newson, P. C. Wait, and A. H. Hartog, “Influence of modulation instability on distributed optical fiber sensors based on spontaneous Brillouin scattering,” Journal of the Optical Society of America B, 2004, 21(6): 1156–1160.