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超宽带信号(UWB)的光学生成技术是光载超宽带通信系统(UWB-over-fiber)的关键技术,半导体光放大器(SOA)的非线性特征在全光信号处理中有着广泛的应用。提出基于SOA的交叉相位调制(XPM)效应的UWB的光学生成方法。该方法首先利用SOA的XPM实现高功率的高斯泵浦光和低功率的直流探测光的XPM,然后利用光学滤波器对探测光进行鉴频,实现相位调制到强度调制的转换,从而获得单周期UWB信号。提出了采用光带通滤波器和波分复用器对探测光进行鉴频的两种方法,获得中心频率分别为5.15GHz和5.05GHz,相对带宽分别为150%和149%的UWB信号,符合FCC标准。
The UWB optical generation technology is the key technology of UWB-over-fiber system. The nonlinear characteristics of semiconductor optical amplifier (SOA) have been widely used in all-optical signal processing. An optical generation method of UWB based on the cross-phase modulation (XPM) effect of SOA is proposed. The method first uses XPM of SOA to realize XPM of high-power Gaussian pump light and low-power DC detection light, and then filters the probe light with an optical filter to realize phase modulation to intensity modulation conversion to obtain a single cycle UWB signal. Two methods of using optical band-pass filter and wavelength-division multiplexer to discriminate probe light are proposed. UWB signals with center frequency of 5.15GHz and 5.05GHz and relative bandwidth of 150% and 149% respectively are obtained. FCC standards.