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在由一个外腔分布反馈(DFB)半导体激光器和一个独立的DFB半导体激光器构成的开环单向耦合混沌同步系统中,通过微调发射激光器的偏置电流可以精确控制两个激光器之间的频率失谐,从而可对不同频率失谐下的系统混沌同步状态进行研究。实验研究结果表明,在较小的频率失谐范围(-0.19~0.95 GHz)之内,混沌时间序列在传输延迟时间与外腔反馈时间之差处得到了最大0.84的关联值,而在传输延迟时间处的关联值为0.78。此时,完全同步超越广义同步,系统呈现完全同步状态(CCS);当频率失谐超过这一范围,广义同步超越完全同步,混沌同步将表现为广义同步状态(GCS)。因此,通过调节发射激光器的电流,可实现完全同步和广义同步之间的转换。理论仿真结果与实验所得结果趋势相同。
In an open-loop, one-way, coupled-chaotic synchronization system composed of an external cavity distributed feedback (DFB) semiconductor laser and an independent DFB semiconductor laser, the frequency loss between the two lasers can be precisely controlled by fine tuning the bias current of the emitting laser Harmonics, which can be chaos synchronization of different frequencies under the system chaos state. The experimental results show that the chaotic time series has a maximum correlation value of 0.84 at the difference between the transmission delay time and the external cavity feedback time within the range of small frequency detuning (-0.19 ~ 0.95 GHz) The correlation at time is 0.78. At this point, the complete synchronization outperforms the generalized synchronization and the system assumes a fully synchronized state (CCS). When the frequency mismatch exceeds this range, the generalized synchronization goes beyond complete synchronization and the chaotic synchronization will show as a generalized synchronization state (GCS). Therefore, by adjusting the current of the emitting laser, the conversion between full and generalized synchronization can be achieved. The theoretical simulation results show the same tendency with the experimental results.