A filter-free microwave photonic single-sideband mixer based on dual-polarization dual-drive Mach–Zehnder modulator (DPol-DDMZM) is proposed and verified experimentally. By adjusting the bias voltages of two DDMZMs, each DDMZM generates a single-sideband (SSB) signal with upper or lower sideband. The optical carrier is cancelled by adjusting the polarization controller before a polarizer. The single-sideband frequency upconversion and downconversion are independently achieved with the mixing spurs suppressed. The proposed frequency converter has a large operating bandwidth since no filter is used, and there is no dispersion-induced power fading due to the SSB modulation when transmitting in a long fiber with a dispersion. Experimental results show that all the mixing spurs are well suppressed over a wideband frequency range, and the maximum sideband suppression ratio of desired signal is up to 36 dB.

提出了一种基于双偏振双驱动Mach-Zehnder调制器（DPol-DDMZM）的无滤波器微波光子单边带混频器，并进行了实验验证。通过调整两个 DDMZM 的偏置电压，每个 DDMZM 生成具有上边带或下边带的单边带 (SSB) 信号。通过调节偏振器之前的偏振控制器来消除光学载波。单边带上变频和下变频是独立实现的，并且抑制混频杂散。由于不使用滤波器，所提出的频率转换器具有大的工作带宽，并且在具有色散的长光纤中传输时，不存在由于SSB调制而引起的色散引起的功率衰落。实验结果表明，在宽频带频率范围内，所有混频杂散都得到了很好的抑制，有用信号的最大边带抑制比高达36 dB。