Dr. S. Venkateswara Rao, S. Srinivasulu,. 2019. “Attenuation Based Passive Fiber Optic Sensor – Characterization of Refractive Index at Wide Range of Temperatures Using a Tunable Light Source”. International Journal of Advanced Science and Technology 28 (13), 156 -67. http://sersc.org/journals/index.php/IJAST/article/view/1292.