基于拉曼放大对色散渐减光纤的绝热压缩效果的优化

Optimization of adiabatic compression in dispersion decreasing fiber using distributed Raman amplification

数值研究了光纤损耗对色散渐减光纤中基孤子脉冲的绝热压缩的影响,并分析了利用分布式的拉曼放大来提高DDF的绝热压缩效果的方案。结果表明:光纤损耗严重破坏了DDF对基孤子绝热压缩的效果; 采用分布式的拉曼放大能对DDF的绝热压缩起到很好的优化效果,获得更高的压缩因子和脉冲能量;当拉曼增益系数选取优化值0．27／LD时,脉宽为10 ps的基孤子脉冲压缩后可得到脉宽仅417 fs、脉冲能量增至5.9 倍、峰值功率增至136．3倍、基座能量比仅为2．8％的输出脉冲。

The influence of the fiber loss on adiabatic compression of fundamental solitons in dispersion decreasing fiber （DDF） is investigat, ed, and the method used to improve the adiabatic compression effect in DDF based on distributed Raman amplifiers （DRAs） has been simulated numerically. The results show that the fiber loss destroys the adiabatic compression effects in DDF; adopting the DRAs can improve the compression effects in DDF and get a higher compression factor and pulse energy; by selecting the appropriate gain parameter of 0.27/LD, a fundamental soliton wit, h 10ps width can be compressed into a 417 fs with 5.9 times initial pulse energy, 136.3 times initial peak intensity and only 2.8% pedestal energy ratio.