1. Delhi Technological University (Formerly Delhi College of Engineering, Faculty of Technology, University of Delhi), TIFAC-Centre of Relevance and Excellence in Fiber Optics and Optical Communication, Department of Applied Physics, Delhi, India
2. CSIR-Central Scientific Instruments Organization, Advanced Materials and Sensors Division, Chandigarh, India
3. Delhi Technological University (Formerly Delhi College of Engineering, Faculty of Technology, University of Delhi), TIFAC-Centre of Relevance and Excellence in Fiber Optics and Optical Communication, Department of Applied Physics, Delhi, IndiabCSIR-Central Scientific Instruments Organization, Advanced Materials and Sensors Division, Chandigarh, India