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利用频率分辨光学门(SHG-FROG)技术研究了拉曼放大对光孤子传输特性的影响。研究表明,拉曼放大能够补偿光纤损耗,但不改变孤子脉冲的时域波形,对孤子脉冲的啁啾影响不大。当传输光纤长度小于拉曼放大有效光纤长度时,拉曼放大能够完全补偿光纤损耗;当传输光纤长度大于拉曼放大有效光纤长度时,拉曼放大能够部分补偿光纤损耗。拉曼放大对光纤损耗的补偿能力随着抽运功率的增加而增大。光孤子脉冲对拉曼放大抽运光偏振特性不敏感。
The effect of Raman amplification on the optical soliton transmission characteristics has been studied using the frequency-resolved optical gate (SHG-FROG) technique. The results show that Raman amplification can compensate the fiber loss without changing the time-domain waveform of the soliton pulse, which has little effect on the chirp of the soliton pulse. When the transmission fiber length is less than the Raman amplification effective fiber length, Raman amplification can completely compensate the fiber loss; when the transmission fiber length is greater than the Raman amplification effective fiber length, the Raman amplification can partially compensate the fiber loss. Raman amplification of fiber loss compensation capacity increases with the pump power increases. Optical soliton impulses are not sensitive to the polarization characteristics of Raman amplification pump light.