Yang Shuna, Qin Xu, Yang Bo, Chi Hao
Opt Lett. 2024 Sep 15;49(18):5107-5110. doi: 10.1364/OL.528652.
A photonic approach for generating and programmable switching variable-band chirped waveforms by using a dual-parallel Mach-Zehnder modulator (DPMZM) is proposed and experimentally demonstrated. By coupling binary switching codes with the baseband chirped signal and applying them into the RF input port of DPMZM, the variable-band chirped waveforms can be generated and fast switched. The switching speed is consistent with the input code bit rate. Moreover, by properly adjusting the bias voltages, the generated signals can be anti-dispersion transmitted over different distances. Full experimental verification on the generation and programmable switching of the chirped waveforms centered at 2.1, 6.3, and 8.4 GHz or 1.5, 4.5, and 6 GHz over 10 or 20 km standard single-mode fibers with 4 or 100 Mbps switching rates are successfully carried out. The proposed approach features compact architecture, programmable switching capability and immunity to power fading, which are significant in distributed multifunction radar networks with optical fiber-based transmission.
提出并通过实验证明了一种利用双并行马赫-曾德尔调制器（DPMZM）生成和可编程切换可变带宽啁啾波形的光子学方法。通过将二进制切换码与基带啁啾信号耦合，并将它们应用于DPMZM的射频输入端口，可以生成并快速切换可变带宽啁啾波形。切换速度与输入码率一致。此外，通过适当调整偏置电压，生成的信号可以在不同距离上进行抗色散传输。成功地对中心频率为2.1、6.3和8.4 GHz或1.5、4.5和6 GHz的啁啾波形在10或20 km标准单模光纤上以4或100 Mbps的切换速率进行生成和可编程切换进行了全面的实验验证。所提出的方法具有结构紧凑、可编程切换能力和抗功率衰落特性，这在基于光纤传输的分布式多功能雷达网络中具有重要意义。
