1. Photonics Research Centre; University of Malaya; 50603 Kuala Lumpur Malaysia
2. Department of Electrical Engineering, Faculty of Engineering; University of Malaya; 50603 Kuala Lumpur Malaysia
3. Department of Electrical and Electronic Engineering; National Defense University of Malaysia; Kem Sungai Besi 57000 Kuala Lumpur Malaysia
4. Fiber Optics and Photonics Division; Central Glass and Ceramic Research Institute, CSIR; Kolkata West Bengal India