控制光和信号光频差对太赫兹光非对称解复用器性能的影响

讨论了半导体光放大器中的带间效应，及载流子热效应、谱烧孔效应、双光子吸收以及超快非线性折射等带内效应对半导体光放大器的动态特性的影响，讨论了两种情况：1)保持控制光波长不变而改变信号光频率，2)保持控制光和信号光频率相同而同时改变它们的频率下半导体光放大器的增益、相位动态特性以及太赫兹光非对称解复用器的开关窗口特性。数值结果表明，为了得到较为平坦而窄的开关窗口，控制光波长应与信号光波长相同，且其与半导体光放大器增益谱中心波长的差值应该大一些。

Analysis of the Performance of TOAD Due to the Frequency Detuning of Control and Signal Pulse

The dynamic characteristics of semiconductor optical amplifiers (SOA) and the performance of switching window of terahertz optical asymmetric demultiplexers (TOAD) are investigated numerically by taking into account not only interband effects but also intraband effects, such as carrier heating, spectral hole burning, two-photon absorption, and ultrafast nonlinear refraction. Two cases are considered. 1) change the frequency of signal pulse while let the wavelength of control pulse unchanged. 2) change the frequency of control and signal pulse on the condition that the frequency of control pulse is the same as that of signal pulse. Numerical results show that in order to obtain flat and narrow switching window, the wavelength of control and signal pulse should be the same, and the difference between the wavelength of control pulse and the center wavelength of SOA's gain spectral should be little larger.