Chen Jia-Qi, Chen Chao, Sun Jing-Jing, Zhang Jian-Wei, Liu Zhao-Hui, Qin Li, Ning Yong-Qiang, Wang Li-Jun
State Key Laboratory of Luminescence Science and Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2024 Jun 5;24(11):3656. doi: 10.3390/s24113656.
Narrow-linewidth lasers mainly depend on the development of advanced laser linewidth measurement methods for related technological progress as key devices in satellite laser communications, precision measurements, ultra-high-speed optical communications, and other fields. This manuscript provides a theoretical analysis of linewidth characterization methods based on the beat frequency power spectrum and laser phase noise calculations, and elaborates on existing research of measurement technologies. In addition, to address the technical challenges of complex measurement systems that commonly rely on long optical fibers and significant phase noise jitter in the existing research, a short-delay self-heterodyne method based on coherent envelope spectrum demodulation was discussed in depth to reduce the phase jitter caused by 1/ noise. We assessed the performance parameters and testing conditions of different lasers, as well as the corresponding linewidth characterization methods, and analyzed the measurement accuracy and error sources of various methods.
窄线宽激光器作为卫星激光通信、精密测量、超高速光通信等领域的关键器件，其相关技术进步主要依赖于先进激光线宽测量方法的发展。本论文基于拍频功率谱和激光相位噪声计算对线宽表征方法进行了理论分析，并阐述了测量技术的现有研究。此外，为应对现有研究中复杂测量系统通常依赖长光纤且存在显著相位噪声抖动的技术挑战，深入讨论了一种基于相干包络谱解调的短延迟自外差方法，以减少1/噪声引起的相位抖动。我们评估了不同激光器的性能参数和测试条件以及相应的线宽表征方法，并分析了各种方法的测量精度和误差来源。
