非线性增益压缩对TOAD开关特性的影响

Influences of Nonlinear Gain Compression on Switching Characteristics of TOAD

考虑半导体光放大器 ( SOA)的增益饱和与非线性增益压缩效应 ,详细研究了非线性增益压缩对太赫兹光非对称解复用器 ( TOAD)开关特性的影响 ,并首次提出了有效开关窗口宽度的概念 .数值计算结果表明 ,非线性增益压缩对开关窗口形状影响显著 .SOA非线性增益压缩越大 ,输出对 SOA在环内的位置越敏感 ;若它较小 ,则控制脉冲能量对有效开关窗口宽度影响很大 ;只有当控制脉冲较窄时有效开关窗口宽度才会受非线性增益压缩的影响 ;当非线性增益压缩较小且 SOA偏离环中点不大时 ,有效开关窗口宽度较小 .

In this paper, the influences of nonlinear gain compression (NGC) on switching characteristics of a terahertz optical asymmetric demultiplexer (TOAD) are investigated thoroughly by taking into account the gain saturation and NGC effects of semiconductor optical amplifier (SOA). And a concept of effective switching window width is presented for the first time. It is shown that the switching window shape is influenced dramatically by the NGC. The bigger NGC is, the more sensitive is the TOAD output to the position of the SOA. If the NGC is small, however, the control pulse energies will have great effects on the effective switching window width. Only when the control pulse is narrow, will the effective switching window width be influenced by the NGC. The effective switching window width will be small if the NGC and the distance between the SOA and the midpoint of the loop are small.