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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。
Four-wave mixing (FWM) phenomenon in quantum dot semiconductor optical amplifier (QD-SOA) was studied by finite difference method. Through simulation, the influence of multiple parameters on the efficiency of four-wave mixing is analyzed. Enhance the pump optical power, increase the length of the QD-SOA and the injection current, four-wave mixing efficiency increased significantly. Increasing the power of the probe light and the wavelength interval between the pump light and the probe light reduce the efficiency of four-wave mixing. Based on the four-wave mixing effect, the XOR operation of the differential phase-shift keying signal is achieved. The output of the XOR logic in the time domain and the frequency domain is obtained. XOR logic is implemented at multiple wavelength positions simultaneously. The 32-bit XOR operation is simulated and the XOR logic timing and eye diagram are obtained.