提出了一种基于级联双电极马赫-曾德尔调制器、光延迟线和半导体光放大器的24倍频毫米波信号生成方案。将两个双电极马赫-曾德尔调制器通过一个光延迟线级联, 获得高纯度±4阶边带, 进而利用半导体光放大器的四波混频效应, 得到±4阶和±12阶边带, 通过波分解复用器选出±12阶边带, 经光电探测器拍频即可得到24倍频毫米波信号。理论分析和仿真验证结果表明, 当输入信号频率为4~10GHz时, 可以生成射频杂散抑制比不低于26dB的24倍频毫米波信号, 且其频谱纯度高, 可调谐性好。

A 24 multiplied millimeter-wave signal generation scheme based on cascaded dual-electrode Mach-Zehnder modulator(DMZM), optical delay line and semiconductor optical amplifier(SOA) was proposed. Two DMZMs were cascaded through a tunable optical delay line to obtain high purity ±4 order sideband. Then, the ±4 order and ±12 order sidebands were obtained based on the four-wave mixing effect of SOA. The ±12 order sidebands were selected by a wavelength division multiplexing demultiplexer, and the 24 multiplied millimeter-wave signal were obtained by photodetector. The theoretical analysis and simulation results show that when the input signal is 4~10GHz, a 24 multiplied millimeter-wave signal with the radio frequency spurious suppression ratio (RFSSR) not less than 26dB can be generated, which has high spectral purity and good tunability.