色散缓变光纤中飞秒高阶孤子脉冲的增强压缩

提出了一种利用孤子绝热放大效应与高阶孤子脉冲压缩效应相结合来压缩飞秒高阶孤子的新方法.通过数值模拟方法证明,采用三阶色散为负的色散缓变光纤压缩高阶孤子,可利用喇曼散射效应与负三阶色散的相互作用,消除正三阶色散对光脉冲压缩产生的不利影响,增加压缩比,提高压缩后光脉冲的质量.研究表明,在色散缓变参量一定的情况下,孤子阶数越高,所需最佳光纤长度越短、光脉冲的压缩比越大;对于相同功率的孤子光脉冲,光脉冲的压缩比随着色散缓变参量的增大而增大;无论是孤子脉冲还是高斯脉冲都适合于色散缓变光纤中的高阶孤子脉冲压缩.

Enhanced Compression of Higher Order Femtosecond Soliton in Fibers with Slowly Decreasing Dispersion

An improved method to compress higher order femtosecond solitons is proposed,which combines the soliton effect compression and adiabatic compression. Numerical simulations show that the enhanced compression of higher order femtosecond solitons can be obtained through the interaction of negative third order dispersion and Raman self scattering in the fibers. Based on the results of the numerical simulation,it is concluded that, given a dispersion decreasing parameter, the higher the soliton order, the shorter the optimum fiber length, and the greater the optimum compression factor. For a certain input pulse, the compression factor will increase with the increase of the dispersion decreasing parameter. It is also shown that both the Gaussian pulses and solitons are favorable for highest quality compression in fibers with slowly decreasing dispersion.