Appl Opt. 2023 May 1;62(13):3512-3518. doi: 10.1364/AO.482284.
A photonic approach for generating dual-band dual-chirp waveforms with the capability of anti-dispersion transmission is proposed. In this approach, an integrated dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM) is adopted to realize single-sideband modulation of a RF input and double-sideband modulation of baseband signal-chirped RF signals. By properly presetting the central frequencies of the RF input and the bias voltages of DD-DPMZM, dual-band dual-chirp waveforms with anti-dispersion transmission can be achieved after photoelectronic conversion. A complete theoretical analysis of the operation principle is presented. Full experimental verification of the generation and anti-dispersion transmission of dual-chirp waveforms centered at 2.5 and 7.5 GHz as well as 2 and 6 GHz over two dispersion compensating modules with dispersion values equivalent to 120 km or 100 km standard single-mode fiber is successfully carried out. The proposed system features a simple architecture, excellent reconfigurability, and immunity to dispersion-induced power fading, which are highly desired in distributed multi-band radar networks with optical-fiber-based transmission.
提出了一种用于产生具有抗色散传输能力的双频双啁啾波形的光子学方法。在该方法中，采用集成的双驱动双平行马赫-曾德尔调制器（DD-DPMZM）来实现 RF 输入的单边带调制和基带信号啁啾 RF 信号的双边带调制。通过适当预置 RF 输入的中心频率和 DD-DPMZM 的偏置电压，可以在光电转换后实现具有抗色散传输的双频双啁啾波形。给出了完整的工作原理理论分析。成功地进行了在两个色散补偿模块上产生和传输中心频率为 2.5GHz 和 7.5GHz 以及 2GHz 和 6GHz 的双啁啾波形的全实验验证，其色散值等效于 120km 或 100km 标准单模光纤。所提出的系统具有简单的架构、出色的可重构性和对色散引起的功率衰落的免疫性，这在基于光纤传输的分布式多频带雷达网络中是非常需要的。
