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码型转换是实现非归零(NRZ)信号全光时钟恢复的关键技术.提出了一种基于折叠式超快非线性干涉仪的全光NRZ到伪归零(PRZ)信号转换的新型方案.基于半导体光放大器的分段模型和超快非线性干涉仪的传输函数,建立了该方案的理论分析模型,数值模拟了不同速率下的码型转换过程.实验实现了稳定的10,20和40Gbit/s的NRZ到PRZ信号的码型转换,分析了影响码型转换输出特性的因素,理论分析结果与实验结果基本符合.
The pattern conversion is the key technology to realize the all-optical clock recovery of non-return-to-zero (NRZ) signal.A new scheme of all-optical NRZ to PRZ signal conversion based on the folded ultrafast non-linear interferometer is proposed. Based on the semiconductor optical amplifier segment model and the ultrafast nonlinear interferometer transfer function, a theoretical analysis model of this scheme is established, and the pattern conversion process is simulated numerically.The stable 10, 20 and 40Gbit / s NRZ to PRZ signal pattern conversion, analysis of the factors that affect the pattern conversion output characteristics, the theoretical analysis of the results and the experimental results are basically in line.