波长可调谐窄线宽激光器的线宽特性

Linewidth Characteristics of Wavelength-Tunable Narrow Linewidth Lasers

为了探究激光器线宽的综合特性,对波长可调谐窄线宽激光器的线宽进行了理论分析。搭建了基于非平衡马赫曾德尔干涉结构的延时自外差测量系统,以研究波长可调谐窄线宽激光器的稳态及动态线宽特性。为了平衡线宽测量的速度和精度,完成了不同接收机带宽下的线宽测试。针对激光器波长连续调谐时产生的线宽展宽问题,通过控制激光器波长调谐时的步进量保持输出功率的稳定性,补偿了线宽的测量误差。该研究不仅能完善激光器线宽特性的研究,对光频域反射技术的研究也具有重要意义。

In order to explore the comprehensive characteristics of the linewidth of the lasers,the theoretical analysis of the linewidth of the wavelengthtunable narrow linewidth lasers is carried out.In this paper,the delayed selfheterodyne measurement system based on the nonequilibrium MachZehnder interferometer structure is built to investigate the steadystate and dynamic linewidth characteristics of wavelengthtunable narrow linewidth lasers.In order to balance the speed and accuracy of linewidth measurements,linewidth tests at different receiver bandwidths are implemented.For the linewidth spreading problem arising from continuous laser wavelength tuning,the linewidth measurement error is compensated by controlling the stepping amount while maintain the stability of the output power.This study can not only improve the study of laser linewidth characteristics,but also has important significance for the study of optical frequencydomain reflectometry technology.