局域单PT对称势中多级孤子的传输特性研究

The transmission of multipole solitons in local single PT symmetric potentials

具有Parity-Time(PT)对称性的光学系统是近年提出的一种新型光学结构,在光开关、光子信息处理器件等方面具有潜在的应用。研究了局域单PT对称光学系统中双级孤子和三级孤子的存在范围与稳定特性。研究结果表明:多级孤子存在一临界传播常数,传播常数对应了线性模下的本征值。双级孤子和三级孤子仅能在较深的PT对称势中才能稳定地传输。多级孤子的稳定性的范围随着PT对称势的深度增加而扩大;孤子的能量随着传播常数的增大而增加,但随着PT对称势的调制深度的增加而减少。

Parity-Time（PT）symmetric optical system is a new optical structure presented in recent years.It will be widely applied to optical switch,photon information handling devices.The existence and stability of dipole and tripole solitons with PT symmetric single complex potentials are reported.The results show that there exists a critical propagation constant,and the eigenvalue for multipole linear mode is equal to the critical propagation constant of multipole solitons existence.Dipole and tripole solitons are stable only in deep potentials,and tripole solitons are stable in deeper potentials than for dipole solitons.The stable regions of solitons increase with increasing potential depth.The power of solitons increases with increasing propagation constant or decreasing modulation depth of the potentials.