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Stimulated Brillouin scattering-induced phase noise in an interferometric fiber sensing system

Chinese Physics B 2012年第3期21卷 256-261页

作者：陈伟孟洲周会娟罗洪 Department of Optic Information Science and Technology College of Optoelectronic Science and EngineeringNational University of Defense Technology

Stimulated Brillouin scattering-induced phase noise is harmful to interferometric fiber sensing systems. The localized fluctuating model is used to study the intensity noise caused by the stimulated Brillouin scattering in a single-mode fiber. The phase noise structure is analyzed for an interferometric fiber sensing system, and an unbalanced Michelson interferometer with an optical path difference of 1 m, as well as the phase-generated carrier technique, is used to measure the phase noise. It is found that the phase noise is small when the input power is below the stimulated Brillouin scattering threshold, increases dramatically at first and then gradually becomes flat when the input power is above the threshold, which is similar to the variation in relative intensity noise. It can be inferred that the increase in phase noise is mainly due to the broadening of the laser linewidth caused by stimulated Brillouin scattering, which is verified through linewidth measurements in the absence and presence of the stimulated Brillouin scattering.

关键词： stimulated Brillouin scattering phase noise interferometric fiber sensing intensity noise

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A simple model of suppressing stimulated Brillouin scattering in optical fiber with frequency-modulated laser

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Chinese Physics B 2014年第12期23卷 215-218页

作者：胡晓阳陈伟涂晓波孟洲 Department of Optic Information Science and Technology College of Optoelectronic Science and EngineeringNational University of Defense Technology

A simple model is developed to study the mechanism of stimulated Brillouin scattering（SBS） suppression with frequency-modulated laser in optical fiber. By taking into account the laser frequency distribution along the fiber induced by frequency modulation, the average effective Brillouin gain is calculated to determine the SBS threshold. Experimental results show agreement with the numerical analysis. The application for SBS suppression in interferometric fiber sensing system is also discussed in this paper. The results show that the maximum input power can be increased effectively by frequency modulation method.

关键词： stimulated Brillouin scattering frequency modulation interferometric fiber sensing

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