【摘要】 基于排列熵(PE)分析,提出了一种基于半导体激光器(SL)在双光反馈作用下获取高复杂度混沌激光的方案。仿真结果表明,当两个光反馈的延迟时间近似相同、而差值约为激光器弛豫振荡周期一半时,混沌光的PE特征值达到最大,具有最高的复杂度。调节双光反馈的强度值,混沌光的PE特征值将随反馈强度的增加而首先快速增大,然后再缓慢降低。在一定优化双光反馈强度值范围内,PE特征值可取得最大值,从而得到高复杂度的混沌光输出。与单光反馈SL系统相比较,在不同反馈强度下,双光反馈系统所获得的混沌光的PE特征值也总是大于单光反馈系统的结果。更多还原

【Abstract】 By adopting the permutation entropy(PE) analysis,a high complex optical chaos generation scheme based on a semiconductor laser(SL) with double optical feedbacks is proposed.The simulated results show that,when the delay times of two optical feedbacks are close to each other,and have a difference of about a half of the SL relaxation oscillation period,the characteristic value of PE reaches a maximum,and the most complex chaotic output can be obtained.With the increase of the strength of two optical feedbacks,the characteristic value of PE firstly experiences a rapid increasing process and then decreases gradually.Thus,the high characteristic values of PE and high complexity chaos output can be founded within a certain range of feedback strengths.Moreover,under different feedback strength settings,the characteristic value of PE for double optical feedback system is always higher than that for single optical feedback system.更多还原