1 COFT, School of EEE, Nanyang Technological University, Singapore 639798, Singapore
2 CINTRA, CNRS/NTU/Thales Research Alliance, Singapore 637553, Singapore
3 Fujian Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
4 Center for Gravitational Experiments, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
5 Department of Electrical and Computer Engineering, Boston University, Boston 02215, USA
6 XLIM Research Institute, UMR 7252 CNRS/University of Limoges, Limoges 87060, France
7 R&T, Thales Solutions Asia Pte Ltd, Singapore 498755, Singapore