宇称时间对称光电振荡器技术研究进展

Research Progress of Parity-time-symmetric Optoelectronic Oscillator

摘要:

随着微波技术的不断进步,提升本振信号源的频率稳定度及相位噪声指标的需求尤为迫切。光电振荡器技术因具备极低的相位噪声以及良好的频率拓展性吸引了研究人员的广泛关注。但光电振荡器内部的长距离光纤大量增加了输出信号的边带,如何解决单模输出与相位噪声之间的矛盾成了光电振荡器领域研究的热点。宇称-时间对称方法在保证输出信号相位噪声的前提下可极大地优化输出信号的边带抑制,受到国内外研究团队的广泛关注。文章在对宇称-时间对称光电振荡器的工作原理和特性进行阐述和分析的基础上,对国内外研究团队设计的宇称-时间对称光电振荡器结构和方案进行了总结,分析比较了各种方案的基本原理及性能指标,讨论了宇称-时间对称光电振荡器技术的未来发展方向。

Abstract:

With the continuous progresses of microwave technology, it is urgent to improve the frequency stability and phase noise index of microwave signal source. Optoelectronic oscillator has attracted wide attention because of its extremely low phase noise and good frequency expansibility. However, the sideband of the output signal is greatly increased by the long fiber inside the optoelectronic oscillator. The method to solve the contradiction between single-mode output and phase noise has become a hot topic in the field of optoelectronic oscillator. Parity-time-symmetry method can greatly optimize the sideband suppression of the output signal on the premise of ensuring the phase noise of the output signal. Based on the description and analysis of the working principle and characteristics of parity-time-symmetric optoelectronic oscillator, the structure and schemes of parity-time-symmetric optoelectronic oscillator designed by domestic and foreign research teams are summarized, and the basic principles and performance indicators of various schemes are analyzed and introduced. And the future development directions of parity-time-symmetric optoelectronic oscillator technology are discussed.