We theoretically and numerically study the effects of thermal noise on pulses in backwards stimulated Brillouin scattering (SBS). Using a combination of stochastic calculus and numerical methods, we derive a theoretical model that can be used to quantitatively predict noise measurements. We study how the optical pulse configuration, including the input powers of the pump and Stokes fields, pulse durations and interaction time, affects the noise in the output Stokes field. We investigate the effects on the noise of the optical loss and waveguide length, and we find that the signal-to-noise ratio can be significantly improved, or reduced, for specific combinations of waveguide properties and pulse parameters.

中文翻译：

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后向激发布里渊散射中的噪声和脉冲动力学

我们在理论和数值上研究了热噪声对后向激发布里渊散射（SBS）中脉冲的影响。结合使用随机演算和数值方法，我们得出了可用于定量预测噪声测量值的理论模型。我们研究了光脉冲配置（包括泵浦和斯托克斯场的输入功率，脉冲持续时间和相互作用时间）如何影响输出斯托克斯场中的噪声。我们研究了光损耗和波导长度对噪声的影响，发现对于波导特性和脉冲参数的特定组合，信噪比可以显着提高或降低。