Affiliation: | a Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Rm. 235A, EE Building 5, Hsinchu 30010, Taiwan b Information and Communications Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu 31040, Taiwan c Department of Electro-Optical Engineering, Yuan Ze University, Chung-Li 32003, Taiwan |