[1] Harbin Engn Univ, Coll Sci, Minist Educ, Key Lab In Fiber Integrated Opt, Harbin 150001, Heilongjiang, Peoples R China
[2] Univ Limerick, Dept Elect & Comp Engn, Opt Fibre Sensors Res Ctr, Limerick V94 T9PX, Ireland
[3] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England
[4] Shenzhen Univ, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Coll Optoelect Engn, Shenzhen 518060, Peoples R China