1. Photonics Engineering Laboratory, Department of Electrical Engineering; University of Malaya; Kuala Lumpur 50603 Malaysia
2. Faculty of Electronic and Computer Engineering, Center for Telecommunication Research and Innovation (CeTRI); Universiti Teknikal Malaysia Melaka; Melaka 76100 Malaysia
3. School of Technology; Assam Don Bosco University, Airport Road, Azara; Guwahati Assam 781017 India