Wang Xudong, Zhang Jinglan, Chan Erwin H W, Feng Xinhuan, Guan Bai-Ou
Opt Express. 2017 Feb 6;25(3):2883-2894. doi: 10.1364/OE.25.002883.
This paper presents a new technique for realizing continuous 0°-360° RF signal phase shift over a very wide bandwidth. It is based on using single-sideband modulation together with optical filtering to largely suppress one of the RF modulation sidebands over a wide input RF frequency range, and controlling the phase of the optical carrier to shift an RF signal phase. The technique does not require expensive electrical or optical components to realize an RF signal phase shift over 2-40 GHz frequency range with a flat amplitude and phase response performance. This overcomes the current technology limitation in which no reported phase shifter structure has demonstrated the capability of operating in such a wide bandwidth. Experimental results demonstrate only ± 1 dB amplitude variation and ± 5° phase deviation from the desired RF signal phase shift over 2-40 GHz bandwidth and the RF signal amplitude control function. The phase shifter wavelength insensitive performance is also demonstrated experimentally.
本文提出了一种在非常宽的带宽上实现连续0°-360°射频信号相移的新技术。该技术基于使用单边带调制并结合光学滤波，以在宽输入射频频率范围内大幅抑制射频调制边带之一，并控制光载波的相位来使射频信号相位发生偏移。该技术在2-40 GHz频率范围内实现射频信号相移时，无需昂贵的电气或光学组件即可实现平坦的幅度和相位响应性能。这克服了当前技术的局限性，即目前尚无报道的移相器结构能够在如此宽的带宽内运行。实验结果表明，在2-40 GHz带宽和射频信号幅度控制功能下，与所需射频信号相移相比，幅度变化仅为±1 dB，相位偏差仅为±5°。实验还证明了该移相器对波长不敏感的性能。
