窄泵浦脉冲对布里渊光时域反射仪测量精度的影响

冯杰; 周晓军; 秦祖军

红外, 2009, 30 (4): 29, 网络出版: 2010-05-26

窄泵浦脉冲对布里渊光时域反射仪测量精度的影响

Influence of Short Pulses on Measurement Accuracy of Brillouin Optical Time Domain Reflectometers

论文大纲

冯杰周晓军秦祖军

作者单位

电子科技大学光电信息学院,四川成都 610054

脉宽线宽布里渊散射测量精度 duration linewidth Brillouin scattering measurement accuracy

摘要

在窄泵浦脉冲下,由于布里渊散射光的线宽与泵浦脉宽有关,布里渊光时域反射仪 (BOTDR)中泵浦脉冲的宽度对BOTDRs的测量精度有影响。本文以数值方法求解了声–光振幅耦合方程,发现当泵浦脉冲的宽度远大于声子寿命时,布里渊散射光的线宽为自然线宽。而当泵浦脉冲的宽度趋于声子寿命时,布里渊散射光的线宽明显增加,从而降低了BOTDR的测量精度。

Abstract

Under the condition of short pump pulse stimulation, the measurement accuracy of a Brillouin optical time domain reflectometer (BOTDR) can be affected by the duration of its internal pump pulses because the linewidth of the Brillouin scattering light is related to the pump pulse duration. In this paper, the acousto-optic amplitude coupling equations are solved numerically. It is found that when the duration of a pump pulse is much greater than the phonon lifetime, the linewidth of Brillouin scattering light is natural, and when the duration of a pump pulse is in the order of the phonon lifetime, the linewidth of Brillouin scattering light is increased significantly, hence the measurement accuracy of the BOTDR is reduced.

参考文献

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冯杰, 周晓军, 秦祖军. 窄泵浦脉冲对布里渊光时域反射仪测量精度的影响[J]. 红外, 2009, 30(4): 29. FENG Jie, ZHOU Xiao-jun, QIN Zu-jun. Influence of Short Pulses on Measurement Accuracy of Brillouin Optical Time Domain Reflectometers[J]. INFRARED, 2009, 30(4): 29.

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