Dr. S. Venkateswara Rao, S. S. “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, Vol. 28, no. 13, Nov. 2019, pp. 156 -7, http://sersc.org/journals/index.php/IJAST/article/view/1292.