1.School of Electrical
and Electronic Engineering, Nanyang Technological University, Singapore
639798, Singapore; 2.Centre for Photonics
and Photonic Materials and Department of Physics, University of Bath,
Bath BA2 7AY, UK; 3.Department of Photonics
Engineering, Technical University of Denmark, Kongens Lyngby 2800,
Denmark; 4.RF and Optical Department,
Institute for Infocomm Research, Agency for Science, Technology and
Research (A*STAR), Singapore 138668, Singapore;
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