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首页> 外文期刊>Optics Letters >Large-scale multiplexed weak reflector array fabricated with a femtosecond laser for a fiber-optic quasi-distributed acoustic sensing system
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Large-scale multiplexed weak reflector array fabricated with a femtosecond laser for a fiber-optic quasi-distributed acoustic sensing system

机译:具有用于光纤准分布声学传感系统的飞秒激光器制造的大型多路复用弱反射器阵列

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摘要

In this Letter, we propose a large-scale multiplexed weak reflector array fabrication method by using a femtosecond laser with relatively high reflectivity and low transmission loss. This kind of weak reflector array can be used in a quasi-distributed acoustic sensing system as sensing fiber instead of single-mode fiber (SMF) to achieve an ultrahigh signal-to-noise ratio (SNR). An automated fabrication system is designed, and a reflector geometric structure with high reflectivity and low scattering loss is designed based on this system. As a prototype to demonstrate the performance, one thousand weak reflectors are written on the SMF with an interval of 10 m, a reflectivity around -42 dB, and a transmission loss of 0.34 dB/km. In comparison to the method of using SMF as the sensing fiber, at least 15.8 dB enhancement to the SNR can be achieved by using the reflector array as the sensing fiber. (C) 2020 Optical Society of America
机译:在这封信中,我们通过使用具有相对高反射率和低传输损耗的飞秒激光来提出大规模的多路复用弱反射器阵列制造方法。 这种弱反射器阵列可用于准分布的声学传感系统,作为传感光纤而不是单模光纤(SMF),以实现超高信噪比(SNR)。 设计了一种自动制造系统,基于该系统设计了具有高反射率和低散射损耗的反射器几何结构。 作为展示性能的原型,一千次弱反射器写在SMF上,间隔为10米,反射率约为-42dB,传输损耗为0.34 dB / km。 与使用SMF作为感测光纤的方法相比,通过使用反射器阵列作为感测光纤,可以实现对SNR的至少15.8dB的增强。 (c)2020美国光学学会

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