Phase and delay investigation of various FBGs for optical beamforming
Phase and delay characteristics of various fiber Bragg gratings (FBGs) are explored for beam steering application. Most common FBGs involved in the analysis are, phase shifted, superstructure, tilted, and chirped FBG. The parameters of the analysis involve effect of apodization, grating lengths, chirp bandwidth, and modulation depth of refractive index. These discussions are much useful for the selection of proper FBG in a specific application. The effect of phase and delay response of FBGs on the array factor of PAA is investigated. The obtained results have been used in beam steering for different wavelengths of carrier signal and modulating frequencies of RF signals. To show the squint free beam steering, FBG is implemented in a microwave photonic link which forms an optical beamforming network. In the microwave photonic link, double sideband as well as single sideband modulation has performed on the carrier signal to see the individual response on beam steering.
Indian Institute of Technology (Indian School of Mines), Dhanbad (India)
Sanjeev Kumar Raghuwanshi received the Bachelors degree in electronic and instrumentation engineering from S.G.S.I.T.S. Indore, Madhya Pradesh, India and the Masters degree in Solid State Technology from Indian Institute of Technology, Kharagpur, in Aug. 1999 and Jan. 2002, respectively. Since July 2009, he has been obtained PhD degree in the field of optics from the Department of Electrical Communication Engineering of Indian Institute of Science, Bangalore India. He is an Associate Professor in Electronics Engineering Department of Indian Institute of Technology (ISM) Dhanbad, India. He was the Post-doctoral Research Fellow during 2014-2015 at Instrumentation and Sensor Division, School of Engineering and Mathematical Sciences, City University London, Northampton Square, London. He has published more than 100 peer reviewed and indexed International SCI Journal papers in the last 10 years. He has been published 4 books on contemporary optical fiber domain and 4 Indian patents .