论文部分内容阅读
双向半导体光放大器(SOA)光纤环形混沌激光器输出波形呈帧型结构,相邻帧波形具有相似性且受到外界扰动时其相似性下降。为了获得相似性高且一致性好的混沌波形以准确检测扰动的发生,实验研究了影响该激光器相邻帧相似性的各种因素,包括SOA性能及其驱动电流、系统结构的对称性、输出耦合比以及光纤环长。以相邻帧互相关峰值的平均值考察其相似性,最大偏差衡量其一致性。结果发现,具有偏振保持特性的光功率放大器(BOA)是最适合的有源器件,且其驱动电流越大,相邻帧相似性越好。只要调整偏振控制器使得输出混沌波形呈连续窄带谱的类正弦信号,则系统结构的对称与否、耦合比和光纤环长都不影响其相邻帧的相似性,但光纤环长却影响系统的灵敏度。考察了系统的工作稳定性,5 min左右相邻帧相似性的波动在10-3量级。
The output waveform of the optical fiber circular chaotic laser in a bidirectional semiconductor optical amplifier (SOA) has a frame-like structure, and the similarity of neighboring frame waveforms is reduced when they are disturbed by the outside world. In order to obtain the chaotic waveform with high similarity and good consistence to detect the disturbance accurately, various factors affecting the similarity of adjacent frames of the laser were experimentally studied, including the SOA performance and its driving current, the symmetry of the system structure, the output Coupling ratio and fiber ring length. The similarities of the correlation peak values of adjacent frames were examined, and the maximum deviation was the measure of their consistency. As a result, it has been found that an optical power amplifier (BOA) with polarization maintaining characteristics is the most suitable active device, and the larger its driving current, the better the similarity of adjacent frames. As long as the polarization controller is adjusted so that the output chaos waveform is a sinusoidal signal of continuous narrow band spectrum, the symmetry of the system structure, the coupling ratio and the fiber ring length do not affect the similarity of the adjacent frames. However, the fiber ring length affects the system Sensitivity. The working stability of the system was investigated. The similarity of neighboring frames around 5 min fluctuated in the order of 10-3.