1Center for Advanced Manufacturing and Future Industries, Future Technology School, Shenzhen University of Technology, Shenzhen 518118, Guangdong, China
2Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China
3Photonics Research Center, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China