Tang D Y, Zhao B, Zhao L M, Tam H Y
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jul;72(1 Pt 2):016616. doi: 10.1103/PhysRevE.72.016616. Epub 2005 Jul 19.
We have experimentally investigated the soliton interaction in a passively mode-locked fiber ring laser and revealed the existence of three types of strong soliton interaction: a global type of soliton interaction caused by the existence of unstable cw components, a local type of soliton interaction mediated through the radiative dispersive waves, and the direct soliton interaction. We found that the appearance of the various soliton operation modes observed in the passively mode-locked fiber soliton lasers are the direct consequences of these three types of soliton interactions. The soliton interaction in the laser is further numerically simulated based on a pulse tracing technique. The numerical simulations confirmed the existence of the dispersive-wave-mediated soliton interaction and the direct soliton interaction. Furthermore, it was shown that the resonant dispersive-wave-mediated soliton interaction in the laser always has the consequence of causing random irregular relative soliton movement and the experimentally observed states of bound solitons are caused by the direct soliton interaction. In particular, as the solitons generated in the laser could have a profile with long tails, the direct soliton interaction could extend to a soliton separation that is larger than 5 times the soliton pulse width.
我们通过实验研究了被动锁模光纤环形激光器中的孤子相互作用，并揭示了三种强孤子相互作用的存在：由不稳定连续波分量的存在引起的全局型孤子相互作用、通过辐射色散波介导的局部型孤子相互作用以及直接孤子相互作用。我们发现，在被动锁模光纤孤子激光器中观察到的各种孤子运行模式是这三种孤子相互作用的直接结果。基于脉冲跟踪技术对激光器中的孤子相互作用进行了进一步的数值模拟。数值模拟证实了色散波介导的孤子相互作用和直接孤子相互作用的存在。此外，结果表明，激光器中的共振色散波介导的孤子相互作用总是会导致随机不规则的相对孤子运动，而实验观察到的束缚孤子状态是由直接孤子相互作用引起的。特别是，由于激光器中产生的孤子可能具有长尾轮廓，直接孤子相互作用可以扩展到大于孤子脉冲宽度5倍的孤子间距。
