Chizhevsky V N, Giacomelli Giovanni
B.I. Stepanov Institute of Physics, NASB, 220072 Minsk, Belarus.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 May;77(5 Pt 1):051126. doi: 10.1103/PhysRevE.77.051126. Epub 2008 May 23.
We present the experimental and numerical study of a method for detecting aperiodic binary signals in a bistable, vertical cavity surface emitting laser (VCSEL). The method uses the phenomenon of vibrational resonance, in presence of a fixed level of noise. We show that the addition of a periodic signal with a period much shorter than the bit duration of the aperiodic input signal allows one to significantly increase the cross-correlation coefficient between the input and the output, as well as to substantially decrease the bit error rate. The experimental observation of a time lag between the input and the output of the VCSEL due the high-frequency modulation is reported. The effect of an asymmetry of the bistable quasipotential on the detection is also analyzed. The numerical results of simulations in a simple model are in qualitative agreement with the experiment.
我们展示了一种用于在双稳态垂直腔面发射激光器（VCSEL）中检测非周期性二进制信号的方法的实验和数值研究。该方法利用了在固定噪声水平下的振动共振现象。我们表明，添加一个周期远短于非周期性输入信号比特持续时间的周期性信号，可以显著提高输入与输出之间的互相关系数，并大幅降低误码率。报告了由于高频调制导致的VCSEL输入与输出之间时间延迟的实验观测结果。还分析了双稳态准势的不对称性对检测的影响。一个简单模型中的模拟数值结果与实验定性一致。
