1. Faculty of Electronics Technology, Industrial University of Ho Chi Minh City , Ho Chi Minh City, Vietnam
2. Optoelectronics Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University , Ho Chi Minh City, Vietnam
3. Faculty of Electrical & Electronics Engineering, Ton Duc Thang University , Ho Chi Minh City, Vietnam
4. Faculty of Electrical Engineering and Computer Science, VSB Technical University of Ostrava , Ostrava - Poruba, 708 33, Czech Republic