1. Philips Electronics Ltd., N. T., Hong Kong
2. National Chiao Tung University, Department of Photonics and Institute of Electro-Optical Engineering, Hsinchu 30010, Taiwan
3. Philips Electronics Ltd., N. T., Hong KongbNational Chiao Tung University, Department of Photonics and Institute of Electro-Optical Engineering, Hsinchu 30010, Taiwan
4. Feng Chia University, Department of Photonics, Taichung 40724, Taiwan