Numerical simulation of converted signal characteristics in all-optical demultiplexing based on a NOLM
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摘要: 为了研究非线性光学环形镜解复用输出特性,采用双曲正割形控制脉冲和信号脉冲,对基于非线性光学环形镜全光解复用系统中信号的转换进行了理论分析,得到了脉冲峰值开关效率为100%时,所需最小初始时钟脉冲峰值功率应满足的条件,数值模拟了走离时间、初始时间延迟和初始时钟脉冲峰值功率对转换信号波形特性的影响。结果表明,走离效应是导致转换信号波形失真以及峰值功率下降的重要因素,初始时间延迟可以平衡由走离效应引起的转换信号波形不对称,初始时钟脉冲峰值功率可以补偿由走离效应导致的转换信号峰值功率下降。Abstract: The mechanism of nonlinear optical loop mirror(NOLM) based on all-optical demultiplexing of hyperbolic secant pulse for both signal and clock was theoretically analyzed.The expression of minimum initial peak power of clock pulses,with which the switching efficiency of pulses peak up to 100% can be obtained,was demonstrated.The influence of walk-off time,initial time delay and initial peak power of clock pulses on the shape of output signal were numerically analyzed.The results show that the walk-off between clock pulses and signal pulses plays an important role in all-optical demultiplexing based on NOLM,the lager the walk-off time is,the smaller the peak power of converted signal is,and the more asymmetric the waveform is.Also,it's found that proper initial peak power of clock pulses can compensate the walk-off induced degradation,and initial time delay between clock pulses and signal pulses can balance the waveform asymmetric of converted signal induced by walk-off.
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