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提出了一种基于双通道马赫-曾德尔调制器(DPMZM)调制边带滤波的微波光子移相器。在双通道马赫-曾德尔调制器的结构中,在一路马赫-曾德尔干涉仪上实现抑制光载波的双边带调制输出,而在另一路马赫-曾德尔的相位调节臂上通过调节偏置电压实现光载波信号的光学移相,两路光信号经过干涉合路后由光纤布拉格光栅(FBG)滤除其中一个一阶边带,最后输入到光电探测器(PD)进行光电转换得到移相的微波信号。实验结果表明,基于DPMZM调制边带滤波的微波光子移相器具有传输特性稳定、输出幅度波动小的优点。该结构还具有相移调节响应速度快、应用频带宽以及移相范围大于360°等特点。
A microwave photon phase shifter based on dual-channel Mach-Zehnder modulator (DPMZM) modulation sideband filtering is proposed. In the two-channel Mach-Zehnder modulator configuration, a double-sideband modulated output of the suppressed optical carrier is implemented on one Mach-Zehnder interferometer, and on the other phase of the Mach-Zehnder phase-regulated arm, by adjusting the bias voltage The optical phase shift of the optical carrier signal is realized. Two optical signals are filtered by a fiber Bragg grating (FBG) to remove one of the first-order sidebands after being interfered by the optical coupler, and finally input to a photodetector (PD) for photoelectric conversion to obtain phase-shifted Microwave signal. The experimental results show that the microwave photonic phase shifter based on DPMZM modulation sideband filter has the advantages of stable transmission characteristics and small fluctuation of output amplitude. The structure also has a phase shift adjustment response speed, the application of bandwidth and the phase shift range greater than 360 ° and so on.