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为了有效解决高频毫米波信号源产生困难的问题,提出了一种基于级联强度调制器的24倍频可调毫米波信号产生系统。将低频本振信号调制到第一级双平行马赫-曾德尔强度调制器上,分别控制主调制器和子调制器的偏置电压,使其均偏置在最大传输点上,精确控制低频本振信号的幅值和相位,可以对应产生的-4阶和+4阶边带信号,通过光电检测器拍频,得到的8倍频信号调制到第二级马赫-曾德尔调制器上,控制第二级调制器的偏置电压,使其工作在最小传输点上,可以产生-12阶和+12阶边带信号,经过光电转换后可以得到射频驱动信号频率24倍的毫米波信号,当本振信号频率发生改变时,得到的毫米波信号频率对应改变。
In order to effectively solve the problem of high-frequency millimeter-wave signal source, a 24-fold adjustable millimeter-wave signal generation system based on cascaded intensity modulator is proposed. The low frequency local oscillation signal is modulated to the first stage double parallel Mach-Zehnder intensity modulator to control the bias voltage of the main modulator and the sub-modulator respectively so as to be biased at the maximum transmission point to accurately control the low frequency local oscillation The amplitude and phase of the signal can be generated corresponding to the -4 and +4 order sideband signals through the photodetector beat frequency, the resulting 8 times the frequency modulation signal to the second Mach-Zehnder modulator, control the first The bias voltage of the secondary modulator makes it operate at the minimum transmission point and can generate the -12th and +12th order sideband signals. After photoelectric conversion, the millimeter wave signal with a frequency of 24 times the frequency of the radio frequency driving signal can be obtained. When the frequency of the vibration signal changes, the frequency of the millimeter wave signal correspondingly changes.