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分析了以半导体光放大器 (SOA)为基础的对称马赫 -曾德尔干涉仪 (MZI)解复用器在控制脉冲和信号脉冲反向传播 (CPMZ)与同向传播 (TPMZ)两种工作模式下的开关特性。研究表明 :控制脉冲宽度、半导体光放大器的长度和非线性增益压缩影响着控制脉冲和信号脉冲反向传播开关窗口的大小 ,是限制控制脉冲和信号脉冲反向传播高速工作的主要因素。当控制脉冲宽度小于半导体光放大器的渡越时间时 ,如时延量小于于两倍的半导体光放大器渡越时间 ,控制脉冲和信号脉冲反向传播的峰值开关比开始恶化 ;当控制脉冲宽度超过半导体光放大器的渡越时间时 ,即使时延量大于两倍的半导体光放大器渡越时间 ,峰值开关比也出现恶化。因此当控制脉冲和信号脉冲反向传播高速工作时 ,控制脉冲应尽可能窄 ,且时延量必须大于两倍的半导体光放大器渡越时间以确保有较高的峰值开关比。而半导体光放大器长度效应对控制脉冲和信号脉冲同向传播的影响甚微
The effects of control pulse, CPMZ and TPMZ on the symmetric Mach-Zehnder interferometer (MZI) demultiplexer based on semiconductor optical amplifier (SOA) are analyzed. The switching characteristics. The results show that the control pulse width, the length of the semiconductor optical amplifier and the nonlinear gain compression affect the size of the control pulse and the reverse propagation window of the signal pulse, which is the main factor that limits the high speed operation of the control pulse and the signal pulse reverse propagation. When the control pulse width is smaller than the transit time of the semiconductor optical amplifier, if the delay amount is less than twice the transit time of the semiconductor optical amplifier, the peak switch ratio of reverse propagating of the control pulse and the signal pulse is deteriorated. When the control pulse width exceeds Semiconductor optical amplifier transit time, the peak switch ratio deteriorates even if the amount of delay is more than twice the semiconductor optical amplifier transit time. Therefore, when the control pulse and the signal pulse reversely propagate at a high speed, the control pulse should be as narrow as possible and the amount of delay must be greater than twice the semiconductor optical amplifier transit time to ensure a high peak to peak switching ratio. However, the length effect of semiconductor optical amplifier has little influence on the same direction of control pulse and signal pulse