Yinan Zhang,a Liu Shi,ab Dejiao Hu,a Shiren Chen,a Shouyi Xie,c Yudong Lu,a Yaoyu Cao,a Zhuqing Zhu,b Long Jin,a Bai-Ou Guan,a Sven Roggec and Xiangping Li*a
a Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, China
b School of Physical Science and Technology, Nanjing Normal University, Nanjing, China
c School of Physics, The University of New South Wales, Sydney 2052, Australia