1Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University, Guangzhou, China
2Département d’Optique P.M. Duffieux, Institut FEMTO-ST, UMR 6174 CNRS Université Bourgogne Franche-Comté, 15B Avenue des Montboucons, 25030 Besançon Cedex, France