基于超长环形激光器泵浦的94km布里渊分布式传感系统

94km Brillouin Distributed Optical Fiber Sensors Based on Ultra-Long Fiber Ring Laser Pumping

首次将超长光纤环形激光器的光放大应用于布里渊光时域分析(BOTDA)传感系统,以延伸传感距离。通过对布里渊泵浦消耗、拉曼泵浦相对强度噪声(RIN)转移的抑制及拉曼泵浦功率分布的优化,基于对布里渊增益谱分析的原理在94km的传感距离上实现了3m空间分辨率,以及全程28με/1.4℃应变/温度精度。

A novel optical amplification configuration based on ultra-long fiber laser with a ring cavity was proposed and applied to Brillouin optical time-domain analysis （BOTDA） sensing system ,in order to extend the measurement distance significantly .＆amp;nbsp;The parameters used in the experiment were optimized ,considering the main limitations of the setup ,such as depletion ,self-phase modulation （SPM） and pump-signal relative intensity noise （RIN） transfer .Through analyzing Brillouin gain spectrum , we demonstrated distributed sensing over 94 km of standard single-mode fiber with 3 meter spatial resolution and strain/tempera-ture accuracy of 28 /1.4 ℃ .