1. National Formosa University, Department of Electrical Engineering, No. 64, Wunhua Road, Huwei Township, Yunlin County 632, Taiwan
2. National Cheng Kung University, Institute of Computer and Communications Engineering, Advanced Optoelectronic Technology Center, Department of Electrical Engineering, Tainan, Taiwan
3. National Formosa University, Department of Electro-Optical Engineering, No. 64, Wunhua Road, Huwei Township, Yunlin County 632, Taiwan
4. National Cheng Kung University, Institute of Electro-Optic Science and Engineering, Advanced Optoelectronic Technology Center, Department of Photonics, Tainan, Taiwan