QD-SOA的四波混频及DPSK信号的异或逻辑研究

FWM and XOR logic for DPSK signals in QD-SOAs

采用有限差分方法对量子点半导体光放大器(QD-SOA)中的四波混频(FWM)现象进行了研究。通过仿真计算,分析了多个参数对四波混频效率的影响。增强泵浦光功率、增大QD-SOA的长度以及注入电流,四波混频效率明显增大。增大探测光功率以及泵浦光和探测光的波长间隔,四波混频效率均降低。基于四波混频效应实现了差分相移键控信号的异或逻辑操作,模拟得到了异或逻辑的时域和频域输出结果。在多个波长位置同时实现了异或逻辑,并对32比特的序列异或操作进行了仿真研究,得到了异或逻辑的时序结果及眼图。

The Four Wave Mixing（FWM） of the quantum dots semiconductor optical amplifiers（QD-SOA）was investigated by using the finite differential method based on the transitions between energy levels.The effects of the parameters on the efficiency of FWM were analyzed by simulation.The efficiency of FWM increased with the increase of the power of pump light,the length of QD-SOA and the injected current.The efficiency of FWM decreased with the increase of the power of the probe light and wavelength space.The exclusive-OR（XOR） logic of differential phase-shift keying signals was realized based on the FWM effect and the time domain and frequency domain results of the XOR logic were got by simulation.The XOR logics at position with different wavelengths were realized simultaneously.The XOR logic of 32-bit sequence was investigated and the XOR result and the eye diagram were achieved.