1. National Chung Hsing University,Department of Electrical Engineering,Taichung,Taiwan (R.O.C.)
2. College of Photonics, National Yang Ming Chiao Tung University,Tainan,Taiwan (R.O.C.)
3. Graduate Institute of Optoelectronic Engineering, National Chung Hsing University,Taichung,Taiwan (R.O.C.)