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自相位调制可用于信号脉冲的整形,可实现归零码(RZ)信号的再生。以高非线性光纤(HNLF)为介质,在高非线性光纤中实现了拉曼集总放大和信号脉冲的自相位调制。从理论上分析了同向拉曼泵浦增强信号的自相位调制,大大降低了所需的信号光强度。论证了在色散长度(LD)远大于HNLF长度(L)时由自相位调制(SPM)导致的频谱展宽,它与脉冲的啁啾无关,频谱的功率密度与脉冲的强度无关。因此在高非线性光纤之后加入偏移载波频率的带通滤波器可实现归零码信号的再生。集中拉曼放大可增强再生性能。
Self-phase modulation can be used for signal pulse shaping, can realize the return to zero (RZ) signal regeneration. With high nonlinear fiber (HNLF) as the medium, Raman lumped amplification and signal pulse self-phase modulation are realized in high nonlinear fiber. The self-phase modulation of the enhanced Raman signal is analyzed theoretically, which greatly reduces the required signal intensity. The spectral broadening caused by self-phase modulation (SPM) is demonstrated when the dispersion length (LD) is much larger than the length of the HNLF (L), regardless of the chirp of the pulse, and the power density of the spectrum is independent of the intensity of the pulse. Therefore, adding a band-pass filter offsetting the carrier frequency after the high-nonlinearity fiber can realize the return-to-zero signal regeneration. Centralized Raman amplification enhances reproducibility.