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利用数值模拟的方法研究了电流调制下偏置电流和调制频率对垂直腔面发射半导体激光器(VCSEL)混沌动力学特性的影响。数值模拟结果表明,在一定的调制频率下,偏置电流较大时VCSEL处于稳定的周期一态,偏置电流较小时激光器在调制参数的某些区间会出现阵发混沌;在一定的偏置电流下,调制频率较小时,VCSEL处于稳定的周期一态,调制频率较大时系统在调制参数的某些区间会出现阵发混沌。所以偏置电流和调制频率是影响VCSEL混沌动力学特性的重要参数,可以通过适当控制偏置电流和调制频率找到系统的周期态和混沌态。
The effects of bias current and modulation frequency on the chaotic dynamics of a vertical cavity surface-emitting semiconductor laser (VCSEL) under current modulation were studied by means of numerical simulation. The numerical simulation results show that the VCSEL is in a stable periodic state at a certain modulation frequency and the bias current is large. When the bias current is small, the laser will appear chaotic in some sections of the modulation parameters. At certain bias Current, the modulation frequency is small, the VCSEL in a stable period of one state, the modulation frequency is larger, the system will appear in some of the modulation parameters of intermittent chaos. Therefore, the bias current and modulation frequency are important parameters that affect the chaotic dynamics of VCSEL. The periodic and chaotic states of the system can be found by controlling the bias current and the modulation frequency properly.