[1] Wuhan Univ Technol, Minist Educ, Key Lab Fiber Opt Sensing Technol & Informat Proc, 122 Luoshi Rd, Wuhan 430070, Peoples R China
[2] Survey & Design Inst China Raliways 4, Wuhan 430063, Peoples R China
[3] Zhongbei Signal Software Co Ltd, Beijing, Peoples R China