Bludov Yuli V, Hang Chao, Huang Guoxiang, Konotop Vladimir V
Opt Lett. 2014 Jun 15;39(12):3382-5. doi: 10.1364/OL.39.003382.
We study the interaction of a soliton in a parity-time (PT) symmetric coupler which has local perturbation of the coupling constant. This defect does not change the PT-symmetry of the system, but locally can achieve the exceptional point. We found that the symmetric solitons after interaction with the defect either transform into breathers or blow up. The dynamics of antisymmetric solitons are more complex, showing domains of successive broadening of the beam and of the beam splitting in two outward propagating solitons, in addition to the single breather generation and blowup. All the effects are preserved when the coupling strength in the center of the defect deviates from the exceptional point. If the coupling is strong enough, the only observable outcome of the soliton-defect interaction is the generation of the breather.
我们研究了具有耦合常数局部微扰的奇偶时间（PT）对称耦合器中孤子的相互作用。这种缺陷不会改变系统的PT对称性，但在局部可以达到例外点。我们发现，与缺陷相互作用后的对称孤子要么转变为呼吸子，要么爆炸。反对称孤子的动力学更为复杂，除了产生单个呼吸子和爆炸外，还表现出光束连续展宽以及光束分裂为两个向外传播孤子的区域。当缺陷中心的耦合强度偏离例外点时，所有这些效应仍然存在。如果耦合足够强，孤子与缺陷相互作用的唯一可观测结果就是产生呼吸子。
