Influence of Laser Linewidth on Phase-OTDR System Based on Heterodyne Detection Li, Jiong ; Zhang, Zhitao ; Gan, Jiulin ; Zhang, Zhishen ; Heng, Xiaobao ; Zhou, Kaijun ; Zhao, Hua ; Xu, Shanhui ; Yang, Zhongmin Abstract Publication: Journal of Lightwave Technology Pub Date: June 2019 DOI: 10.1109/JLT.2018.2886461 Bibcode: 2019JLwT...37.2641L