Real-Time RF Multi-Dimensional Signal Switching Using Polarization-Dependent Optical Mixing
Real-Time RF Multi-Dimensional Signal Switching Using Polarization-Dependent Optical Mixing
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DOI：
10.1109/jphot.2020.2977847
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发表时间：
2020-03
影响因子：
2.4
通讯作者：
Qidi Liu;M. Fok
中科院分区：
文献类型：
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作者：
Qidi Liu;M. Fok
RF信号特性（包括相位、频率和幅度）的实时切换对于新兴的高速RF系统至关重要，可以提高安全性、信号保真度并增强数据容量。虽然以GHz速度切换RF信号的幅度是容易的，但不幸的是，以皮秒范围内的快速切换时间执行RF信号的相位或频率切换是极具挑战性的。本文提出了一种基于高非线性光纤中偏振相关四波混频的射频信号实时切换技术。由于四波混频的幅度、相位和频率透明特性，该方案能够操纵频率超过几十GHz的多维射频信号，实现GHz射频信号的跳频和相位切换。切换时间不受所提出的时间切换技术的限制;相反，它仅取决于控制信号本身的上升/下降时间。此外，产生的跳频信号的切换时间为50 ps，以及同时频率和相位切换的GHz的RF信号已被实验证明基于所提出的RF信号切换方案。
Real-time switching of RF signal properties, including phase, frequency, and amplitude, is essential for emerging high-speed RF systems to improve security, signal fidelity, and enhance data capacity. While it is easy to switch the amplitude of an RF signal at GHz speed, unfortunately, it is extremely challenging to perform phase or frequency switching of an RF signal with a fast switching time in the picosecond range. In this paper, a real-time RF signal switching technique is proposed and demonstrated based on polarization dependent four-wave mixing in a highly-nonlinear optical fiber. Due to the amplitude, phase, and frequency transparent property of four-wave mixing, the proposed scheme is capable of manipulating multidimensional RF signal of over tens of GHz frequency, and achieve frequency hopping and phase switching of a GHz RF signal. The switching time is not limited by the proposed temporal switching technique; instead, it is solely depending on the rise/fall time of the control signal itself. Furthermore, the generation of frequency hopping signal with a switching time of 50 ps, as well as simultaneously frequency and phase switching of a GHz RF signal have been experimentally demonstrated based on the proposed RF signal switching scheme.