Chen Yang, Wen Aijun, Chen Yan, Wu Xiaohui
Opt Express. 2014 Jun 30;22(13):15618-25. doi: 10.1364/OE.22.015618.
A novel photonic approach to generating binary and quaternary phase-coded microwave waveforms with an ultra-wide frequency tunable range is proposed and experimentally demonstrated. In the proposed system, a dual-parallel Mach-Zehnder modulator (DP-MZM) is used as an optical wavelength shifter. To generate a phase-coded microwave waveform, the coding signal is modulated on the original wavelength using a phase modulator (PM). Combining the shifted wavelength and the original wavelength, two wavelengths with a frequency space determined by the input microwave signal are obtained. Applying them to a photodetector (PD), a phase-coded microwave waveform is generated. The key significance of the approach is that both binary and quaternary phase-coded microwave waveforms can be generated with an ultra-wide frequency tunable range. An experiment is performed. The generation of binary and quaternary microwave waveforms with a microwave carrier frequency at 10 and 20 GHz is demonstrated.
提出并通过实验证明了一种用于生成具有超宽频率可调范围的二进制和四进制相位编码微波波形的新型光子方法。在所提出的系统中，双并行马赫-曾德尔调制器（DP-MZM）用作光波长移位器。为了生成相位编码微波波形，使用相位调制器（PM）在原始波长上调制编码信号。将移位后的波长与原始波长相结合，得到两个频率间隔由输入微波信号确定的波长。将它们应用于光电探测器（PD），生成相位编码微波波形。该方法的关键意义在于，可以在超宽频率可调范围内生成二进制和四进制相位编码微波波形。进行了一项实验。演示了在10 GHz和20 GHz微波载波频率下生成二进制和四进制微波波形的过程。
