Lin Wei1, Liu Bo1, Miao Kai1, et al. Dynamic tuning method for extinction ratio of long-distance fiber-optic sensing systems[J]. 2011,(2):29-32. DOI: 10.13756/j.gtxyj.2011.02.021.
The extinction ratio of a fiber-optic interferometer determines to a great extent the sensitivity of the interferometric fiber-optic sensing system.This article theoretically analyzes the factors affecting the extinction ratio of interference structure-based distributed fiber-optic vibration sensing systems and points out that polarization state is the main cause affecting the system extinction ratio.On this basis
a high cost-performance online polarization controller is designed and implemented.By tuning the polarization state
the dynamic equilibrium of the extinction ratio in long-distance distributed fiber-optic vibration sensing system is achieved.
关键词
长距离光纤传感系统偏振控制器消光比
Keywords
long distancefiber-optic sensing systempolarization controllerextinction ratio