Single-/dual-wavelength switchable and tunable compound-cavity erbium-doped fiber laser with super-narrow linewidth

A single-/dual-wavelength switchable and tunable erbium-doped fiber laser (EDFL) with super-narrow linewidth has been proposed and experimentally demonstrated at room temperature. The fiber laser is based on a compound cavity simply composed of a ring main cavity and a two-ring subring cavity (TR-SC). Regardless of single- or dual-wavelength operation, the EDFL could always work well in single-longitudinal-mode (SLM) state at every oscillating wavelength. In dual-wavelength operation, the spacing could be tuned from 0 nm to 4.83 nm. In single-wavelength operation, the EDFL could lase at a fixed wavelength of 1 543.65 nm or another wavelength with a tunable range of 4.83 nm. The super-narrow linewidths of 550 Hz and 600 Hz for two wavelengths are obtained. The proposed EDFL has potential applications in microwave/terahertz-wave generation and high-precision distributed fiber optical sensing.     

双光束干涉型光纤传感器灵敏度与精度受光源谱分布特性的影响分析

基于对双光束干涉型光纤传感器原理的分析,针对洛仑兹、高斯、矩形3种典型光源谱分布,通过对谱分布线宽与光电管接收端功率谱密度之间关系的定量分析,讨论了3种典型光源谱分布特性对传感器灵敏度的影响.假设光场为稳态、遍历随机过程,定量分析了光源谱线宽与接收端相位改变量之间的关系,对比了3种光源谱特性对于传感器精度的影响.结果表...     

掺铥光纤激光器中光子暗化效应的影响因素

本文以目前报道的掺镱光纤激光器暗化效应为基础,对掺铥光纤激光器的光子暗化效应开展了研究。随着掺铥光纤激光器输出功率的持续增长及应用范围的不断拓展,人们对其输出功率的稳定性提出了更严格的要求,但掺铥光纤激光器在长时间工作时会因光子暗化效应的影响而出现输出功率降低、稳定性变差等现象,严重地影响了光纤激光器进一步发展。鉴于此,本文自主设计了一款暗化效应的测试装置,实现了对光子暗化可重复、快速的测量,该装置简洁精准,以外加光源信号的损耗变化情况来量化暗化效应产生的影响。实验中,对测量的数用拉伸指数函数进行拟合后,分析出了不同因素对光子暗化效应的影响关系。     

光纤陀螺温度补偿的实验研究

本文在理论分析光纤敏感环热致非互易特性的基础上,针对采用以ＱＵＡ方法 绕制的光纤敏感环的光纤陀螺,对于由外界环境温度变化而导致的光纤陀螺输出噪声进行数值模拟,并给出实施温度补偿的实验方案与相应结果。