Research on Microwave Frequency Shift Method Based on Photonics
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摘要: 微波移频技术(MFS)广泛应用于电子对抗、卫星通信、频控阵雷达等系统。基于光子学的微波移频方法具有带宽大、频谱纯净等优点。为了探索基于光子学的微波移频性能，该文对比研究了基于声光移频(AOFS)、锯齿波相位调制(SPM)和I/Q调制3种微波光子移频方法，阐释了3种方法的原理，搭建了对应的原理验证系统，对不同的移频方法进行了实验与分析。结果表明，3种移频方法都可以实现精准的微波信号移频，实现大于30 dB的杂散抑制比。但3种移频方法也存在各自的局限性：AOFS的工作频率、带宽和移频方向较为固定，可调谐性低；SPM移频与I/Q调制对输入驱动信号要求严格，系统稳定性较差。Abstract: Microwave Frequency Shift (MFS) technology is widely used in electronic countermeasures, satellite communications and frequency diverse array radar. The MFS method based on photonics has the advantages of large bandwidth and pure spectrum. In order to explore the performance, three MFS methods based on Acousto-Optic Frequency Shifter (AOFS), Sawtooth Phase Modulation (SPM) and I/Q modulation are compared in this paper. The principles of the three methods are illustrated and the corresponding verification systems are built for experiments and analysis. The results show that the three methods can achieve accurate MFS whose spurious suppression ratios are greater than 30 dB. However, the three methods simultaneously have different limitations: the operating frequency, bandwidth, and frequency shift direction of AOFS are relatively fixed which means the tunability is low; methods based on SPM and I/Q modulation have strict requirements on the input driving signal which leads to poor stability.
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表 1 实验器材型号和参数表
器件名称 型号 器件名称 型号 激光器 KG-DFB-40-C32 微波信号源 Agilent, E8256D MZM AZ-DV5-65-PFA-PFA-SSZ818 OBPF EXFO XTM-50 AOFS IPF-500-50-1550-2FP PD Finisar BPDV2150R PM
功率放大器PM-DV5-40-PFA-PFA-LV
CMP-0.122G-3329-K直流源
光谱仪Gwinstek GDP-4303S
BOSA BOSA400C+LPDM-DPMZM Fujitsu FTM7977HQA 频谱仪 R&S FSQ40 函数发生器 Junctek PSG 9060 
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表 2 3种移频方式对比
移频方式 工作频率范围(GHz) 瞬时带宽 移频量 杂散抑制比(dB) 稳定性 可调谐性 AOFS 8～65 GHz量级 <1 >45 稳定 差 SPM 8～65 GHz量级 取决于DDS或DAC 20～35 较差 优 I/Q调制 8～40 GHz量级 DC～40 30～40 中 优
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