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当皮秒孤子在群色散指数衰减的色散渐变光纤中传输时 ,孤子的群色散和自相位调制保持局域平衡 ,宽度可以保持不变。但对亚皮秒孤子 ,由于受拉曼自频移效应和三阶色散效应的共同影响 ,要想继续保持群色散与自相位调制的局域平衡 ,光纤的群色散分布应加以修正。对传输亚皮秒孤子的色散渐变光纤的群色散分布加以修正、讨论并对亚皮秒孤子的传输情况进行了数值模拟。模拟结果与理论一致。
When picosecond solitons propagate in chromatic dispersion-graded fibers with exponentially decaying dispersion, the group dispersion and self-phase modulation of the solitons maintain the local equilibrium, leaving the width unchanged. However, for sub-picosecond solitons, the collective dispersion of the optical fiber should be corrected in order to keep the local balance of the group dispersion and the self-phase modulation due to the Raman self-frequency shift effect and the third-order dispersion effect. The dispersion distribution of chromatic dispersion graded fiber transmitting sub-picosecond solitons is modified, and the transmission of sub-picosecond solitons is numerically simulated. The simulation results are consistent with the theory.