1. Graduate Institute of Photonics and Optoelectronics and the Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
2. Optical Access Technology Laboratory, Photonic ICT Research Center, Network Research Institute, National Institute of Information and Communications Technology, Koganei, Japan
3. Department of Microelectronics, Fudan University, Shanghai, China
4. Department of Electronics Engineering, National Kaohsiung University of Sciences and Technology, Kaohsiung, Taiwan
5. Department of Photonics, National Yangming Chiao-Tung University, Hsinchu, Taiwan