We describe stimulated Brillouin scattering process in a fiber system with light field phase modulated by lowpass filtered and amplified pseudo random bit sequence (PRBS) using localized nonfluctuating source model. The effective Brillouin gain spectra and the ratio of normalized Stimulated Brillouin Scattering (SBS) threshold to RMS optical linewidth is used to characterize the SBS suppression capability of the PRBS phase modulation. The normalized effective Brillouin gain spectra for different modulation parameters are calculated to exhibit the Brillouin gain broadening process. Based on the theoretical model, we find that the SBS threshold reaches a maximum for the ratio of cutoff frequency to clock rate r_c = 0.53 and RMS modulation depth k_rms = 0.55 π for PRBS9. An effective Brillouin gain spectrum measurement setup is established, and the theoretical predictions are verified by the experiment.

中文翻译：

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光纤系统中基于伪随机位序列相位调制的有效布里渊增益谱展宽 SBS 抑制


我们使用局部非波动源模型描述了光纤系统中的受激布里渊散射过程，该光纤系统具有通过低通滤波和放大的伪随机位序列（PRBS）进行相位调制的光场。有效布里渊增益谱和归一化受激布里渊散射(SBS)阈值与RMS光线宽之比用于表征PRBS相位调制的SBS抑制能力。计算不同调制参数的归一化有效布里渊增益谱以展示布里渊增益展宽过程。基于理论模型，我们发现对于 PRBS9，SBS 阈值在截止频率与时钟速率之比 r _c = 0.53 和 RMS 调制深度 k _rms = 0.55 π 时达到最大值。建立了有效的布里渊增益谱测量装置，并通过实验验证了理论预测。