提出了一种基于电吸收调制激光器的双功能系统，可以同时实现微波信号的产生和其相位噪声的测量。该系统由基于电吸收调制激光器的光电振荡器模块和基于光延时线技术的相位噪声测量模块构成。通过使用单个电吸收调制激光器代替激光源和强度调制器，所提出的双功能系统不仅成本低廉、结构简单，而且性能表现优异；有利于在基于OEO的射频系统，特别是信号产生系统的研制、优化与工作过程中，及时评估信号源的质量并作出相应的参数调整以优化其性能，为光电振荡器的相位噪声测试提供了简单的解决方案。实验结果表明，由光电振荡器生成的9.952 GHz信号的边模抑制比为66 dB，相位噪声为-116.53 dBc/Hz@10 kHz。此外，相位噪声测量系统的相位噪声基底达-133.71 dBc/Hz@10 kHz，其测量灵敏度优于商用信号分析仪R&S FSV40。

在半导体激光器中引入自旋极化载流子是实现室温自旋电子应用的新途径，其超越了常规的磁阻效应。自旋极化载流子的注入导致自旋激光器具有丰富的动力学行为并展示出包括高频偏振振荡和偏振混沌动力学等特性，使其在保密光通信、量子计算、光信息处理和数据存储、可重构光互联以及生物医学传感等领域具有巨大的应用潜力。梳理了近年来自旋激光器的动力学特性及其应用研究进展。介绍了自旋激光器丰富的动力学行为及混沌演变机制；随后分析了自旋激光器的高频振荡特性；归纳了基于自旋激光器动力学特性的最新应用研究进展。在此基础上，展望了自旋激光器的发展趋势和面临的挑战，为相关领域的研究和工程应用提供参考。

We study modulation properties of two-element phased-array semiconductor lasers that can be described by coupled mode theory. We consider four different waveguide structures and modulate the array either in phase or out of phase within the phase-locked regions, guided by stability diagrams obtained from direct numerical simulations. Specifically, we find that out-of-phase modulation allows for bandwidth enhancement if the waveguide structure is properly chosen; for example, for a combination of index antiguiding and gain-guiding, the achievable modulation bandwidth in the case of out-of-phase modulation could be much higher than the one when they are modulated in phase. Proper array design of the coupling, controllable in terms of the laser separation and the frequency offset between the two lasers, is shown to be beneficial to slightly improve the bandwidth but not the resonance frequency, while the inclusion of the frequency offset leads to the appearance of double peak response curves. For comparison, we explore the case of modulating only one element of the phased array and find that double peak response curves are found. To improve the resonance frequency and the modulation bandwidth, we introduce simultaneous external injection into the phased array and modulate the phased array or its master light within the injection locking region. We observe a significant improvement of the modulation properties, and in some cases, by modulating the amplitude of the master light before injection, the resulting 3 dB bandwidths could be enhanced up to 160 GHz. Such a record bandwidth for phased-array modulation could pave the way for various applications, notably optical communications that require high-speed integrated photonic devices.

A ring of three unidirectionally coupled semiconductor lasers (RTUC-SLs) is used to generate broadband chaos with no pronounced time-delay (TD) signature. Using the autocorrelation function and permutation entropy as the TD measures, we demonstrate that under suitable coupling strength, the loss of the TD signature of the lasers in the RTUC-SL configuration is achieved both for the intensity and the phase. These findings should prove valuable for developing high-quality optical chaos for potential applications, such as chaos-based communications and random number generation.