A photonics-assisted approach to dual-functional analog signal transmitter that can simultaneously generate radio-frequency (RF) signal and linear frequency modulation (LFM) signal is proposed and experimentally demonstrated. Two types of beat notes can be independently generated by heterodyning of two lasers in a photodiode using a 4-channel monolithic integrated distributed feedback (DFB) laser array. In this system, the frequency scanning for the analog signal is achieved by adding a saw-tooth signal modulating on DFB3. To the LFM signal, the center frequency and bandwidth can be tuned only by changing the direct current and the voltage of driving signal, respectively. In the experimental demonstration, the center frequency for the generated analog signal is ranging from 2 GHz to 35 GHz, limited only by the bandwidth of PD. The instantaneous bandwidth reaches to 10 GHz as well as the time-bandwidth product ~ 480,000 at the peak-to-peak voltage ~ 3.5 V. Dual-functional integration analog signal transmitter is possible to adapt to variable environments, with more flexible frequency tunability for multiple function and broadband bandwidth for high resolution.

中文翻译：

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使用单片集成 DFB 阵列的同步 RF/LFM 信号双功能发射器

提出了一种双功能模拟信号发射器的光子辅助方法，该方法可以同时生成射频 (RF) 信号和线性频率调制 (LFM) 信号，并进行了实验证明。通过使用 4 通道单片集成分布式反馈 (DFB) 激光器阵列对光电二极管中的两个激光器进行外差作用，可以独立生成两种类型的拍音。在该系统中，模拟信号的频率扫描是通过在 DFB3 上添加锯齿信号调制来实现的。对于LFM信号，仅通过改变驱动信号的直流电流和电压，就可以调整中心频率和带宽。在实验演示中，生成的模拟信号的中心频率范围为 2 GHz 至 35 GHz，仅受 PD 带宽的限制。