对光纤AM-CATV外调制传输系统中附加相位调制法抑制受激布里渊散射(SBS)进行了详细的实验研究，结果显示SBS抑制效果与调相源个数及相位调制深度有关，与调相源频率无关；单个调相源可将SBS阈值提高到13dBm以上，而两个调相源可将系统SBS阈值提高到18dBm以上；相位调制对系统的非线性特性无影响。

The detail experimentalstudy of phase modulation for Stimulated Brillouin Scattering (SBS) suppression in opticalfiber AM-CATV externally modulated transmitter is presented in this paper. Theexperimental data show that the improvement of SBS threshold is dependent of the number ofSBS suppression source and the phase modulation index, and independent of the frequency ofSBS suppression signal. The experiments also show that single signal phase modulation canimprove the SBS threshold to 13 dBm and two signal phase modulation can improves the SBSthreshold to 18 dBm or above. It is also demonstrated in this paper that the phasemodulation has no influence on the nonlinearity in optical fiber AM-CATV externallymodulated transmission system.