Zhao Kangjun, Jia Hongxiang, Wang Pan, Guo Jingjing, Xiao Xiaosheng, Yang Changxi
Opt Lett. 2019 Sep 1;44(17):4323-4326. doi: 10.1364/OL.44.004323.
We present a simple and low-cost approach to generate dual combs from a single fiber-ring cavity based on nonlinear multimode interference. A single-mode fiber-graded-index multimode-single-mode fiber structure serves as an all-fiber saturable absorber for mode-locking. A pair of frequency combs with different comb spacing are generated by dual-wavelength and polarization-multiplexed mechanisms. Stable and simplified dual-comb spectroscopy is achieved using the proposed free-running fiber laser, with no need for complex phase-locking configurations. As a principle of concept, we demonstrate the dual-comb fiber laser for spectral determination of fiber Bragg grating (FBG)-based strain sensors, providing a low-cost alternative for interrogation of FBG-based sensing networks.
我们提出了一种基于非线性多模干涉，从单个光纤环形腔中产生双梳状信号的简单且低成本的方法。单模光纤-渐变折射率多模-单模光纤结构用作锁模的全光纤饱和吸收体。通过双波长和偏振复用机制产生一对具有不同梳齿间距的频率梳。使用所提出的自由运行光纤激光器实现了稳定且简化的双梳光谱，无需复杂的锁相配置。作为概念验证，我们展示了用于基于光纤布拉格光栅（FBG）的应变传感器光谱测定的双梳光纤激光器，为基于FBG的传感网络的询问提供了一种低成本替代方案。
