提出了一种使用光学技术产生可调谐的四倍频相位编码信号的方案。利用一个马赫-曾德尔调制器(MZM),一个光滤波器(OBPF),一个布拉格光栅(FBG),一个环形器,两个偏振调制器(PolM)和光电探测器,结合波长复用技术、偏振调制技术和平衡探测技术,产生四倍频相位编码信号。仿真结果表明,此方法产生的相位编码信号具有大调谐范围,高倍频系数。仿真产生的20 GHz和40 GHz相位编码信号分别具有10.10 dB和9.79 dB的峰值旁瓣比,压缩比都是128。同时,从相位编码中恢复出来的相位信息分别具有200°和206°的变化。仿真结果验证了产生四倍频相位编码信号的可行性,所产生的相位编码信号具有20~40 GHz的调谐范围,同时还表现出很好的脉冲压缩性能。

A photonic scheme to generate frequency quadrupling phase-coded microwave with large frequency tunability is proposed. A phase coded signal can be generated by utilizing a Mach-Zehnder modulator (MZM), an optical band pass filter (OBPF), a fiber Bragg grating (FBG), a circulator, two polarization modulators and photo-diodes based on wavelength multiplexing technology, polarization modulation technology and balanced detection technology. It is confirmed by simulation that the proposed scheme can generate a phase-coded signal with high frequency and large tunability, high multiplication factor. Phase-coded signals with frequencies of 20 GHz and 40 GHz are generated with peak-to-sidelobe ratios (PSR) of 10.10 dB and 9.79 dB respectively and compression ratios of 128. Meanwhile, the phase signal that recovered from the generated phase coded signals show 200° and 206° phase shift, respectively. The simulation results verify the possibility of quadrupling phase-coded signal generation. The generated signal shows a tunable range between 20~40 GHz and exhibits a good pulse compression performance.