1. Photonics Engineering Laboratory, Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
2. Photonics Research Centre, University of Malaya, Kuala Lumpur, Malaysia
3. Faculty of Electronics & Computer Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Melaka, Malaysia
4. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya, Indonesia