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^{1}Department of Electrical Engineering, National Central University, Taoyuan, Taiwan">Department of Electrical Engineering, National Central University, Taoyuan, Taiwan
^{3}Institute of Photonics Technologies , National Tsing-Hua University, Hsinchu, Taiwan">Institute of Photonics Technologies , National Tsing-Hua University, Hsinchu, Taiwan
^{1}Department of Electrical Engineering, National Central University, Taoyuan, Taiwan">Department of Electrical Engineering, National Central University, Taoyuan, Taiwan
^{4}Department of Communications Engineering, Yuan Ze University, Taoyuan, Taiwan">Department of Communications Engineering, Yuan Ze University, Taoyuan, Taiwan
^{5}Electrical and Computer Engineering Department, University of California, Santa Barbara , CA, USA">Electrical and Computer Engineering Department, University of California, Santa Barbara , CA, USA