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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20GHz和40GHz相位编码信号分别具有10.10dB和9.79dB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20~40GHz的调谐范围,同时还表现出很好的脉冲压缩性能。
A scheme of using optical technology to generate a tunable quadruple-frequency phase-coded signal is proposed. Using a Mach-Zehnder modulator (MZM), an optical filter (OBPF), a Bragg grating (FBG), a circulator, two polarization modulators (PolM) and a photodetector, Polarization modulation and balanced detection techniques, resulting in fourfold phase encoded signal. Simulation results show that the phase-encoding signal generated by this method has a large tuning range and a high frequency coefficient. The 20GHz and 40GHz phase-coded signals generated by the simulation have peak sidelobe ratios of 10.10dB and 9.79dB, respectively, with a compression ratio of 128. At the same time, the phase information recovered from the phase coding has a change of 200 ° and 206 °, respectively. The simulation results verify the feasibility of generating a quadruple-frequency phase coded signal. The resulting phase-coded signal has a tuning range of 20-40 GHz and also exhibits good pulse compression performance.