Dr. Rahat Ullah Email and Phone Number

Associate Professor in the Institute of Physics and Optoelectronics, Nanjing University of Information Science and technology, Nanjing, China from April 2017-till date. My job responsibilities are teaching, research and guiding students in their MS, PhD research. I also achieved a project from NSFC, China as a principal investigator, further working as a co-investigator in National R&D Program of China. We have published many research papers in reputed journals having high impact factors, some are as under:1. Rong tang, Bo Liu, Mao Yaya, Rahat Ullah, et al. High security High security OFDM-PON based on an iterative cascading chaotic model and 4-D joint encryption. Optics Communications, 127055, 15th Sept. 2021. 2. Jiajia Chen, Bo Liu, Mao Yaya, Rahat Ullah, et al. Enhancing the Reliability and Security of OFDM-PON Using Modified Lorenz Chaos Based on the Linear Properties of FFT. Journal of Lighwave Technology, 4294-4299, April 2021.3. Rahat Ullah, Sibghat Ullah, et al. Ultrawide and tunable self-oscillating optical frequency comb generator based on an optoelectronic oscillator. Results in Physics, 103849, March 2021.4. X. Song, B. Liu, H. Zhang, Rahat Ullah, et.al. Security-enhanced OFDM-PON with two-level coordinated encryption strategy at the bit-level and symbol-level. Optics Express, pp. 35061-35073, Nov.2020.5. Ming Ye, Liu Bo, Rahat Ullah, et al. 5-D data iteration in a multi-wavelength OFDM-PON using the hyperchaotic system. Optics Letters, pp. 4960-4963, Aug.2020.6. Sibghat Ullah, Rahat Ullah*, et al. Ultra-Wide and Flattened Optical Frequency Comb Generation Based on Cascaded Phase Modulator and LiNbO3-MZM Offering Terahertz Bandwidth. IEEE ACCESS, April 2020.7. Rahat Ullah, Sibghat Ullah, et al. Optical 1.56 Tbps coherent 4-QAM transmission across 60 km SSMF employing OFC scheme. AEU-International Journal of Electronics and Communications, 105, pp.78-84, 2019.

I have completed my Ph.D from Beijing University of Posts and Telecommunications with a major "Optical Engineering" with distinctions, and been awarded with outstanding PhD student award of 2017 by the University.I worked as a research assistant during this time and did my PhD research studies. I taught some subjects to the graduate students and also guide some students in their research and contributed in different research projects and published four SCI/SCIE indexed papers in reputed journals and a principal author and many as a co-author, some are as under:1. Rahat Ullah, Liu Bo, et al. Colorless WDM-PON using single side band carrier suppressed signals mitigating carrier rayleigh backscattering. China Communications 13, no. 12: 150-161, 2016.2. Rahat Ullah, Liu Bo, et al. Pulsed laser-based optical frequency comb generator for high capacity wavelength division multiplexed passive optical network supporting 1.2 Tbps. Optical Engineering 55, no. 9 : 096106, 2016.3. Rahat Ullah, Liu Bo, et al. Cost effective scheme for OLT in next generation passive optical access network based on noise free optical multi carrier. China Communications 13, no. 6: 76-87, 2016.4. Rahat Ullah, Bo Liu et al. “Generation of Coherent and flat frequency locked optical multicarrier”, Asia Pacific Microwave Conference arranged by IEEE, Nanjing China, 6-9 December 2016.5. Rahat Ullah, Liu Bo, et al. Optical frequency comb generation with high tone-to-noise ratio for large-capacity wavelength division multiplexed passive optical network. Optical Engineering 54, no. 11: 116102, 2015.6. Khan, Muhammad Saad, Hongxin Zhang, Pengfei He, Sulman Shahzad, and Rahat Ullah. "A PHEMT based wideband LNA for wireless applications." China Communications 12, no. 10 : 108-116, 2015.7. Ahmad, Ibrar, Xiaojie Wang, Yuz hao Mao, Guang Liu, Haseeb Ahmad, and Rahat Ullah. "Ligature based Urdu Nastaleeq sentence recognition using gated bidirectional long short term memory." Cluster Computing: 1-12, 2017.

I worked in the Faculty of Computer Science and Information Technology, B.tech and Electrical Engineering department, Sarhad University of Science and Information Technology Peshawar Pakistan.I taught Information Theory and Coding, DLD, Electronics I, II, Operational Amplifiers, NetworkSecurity and Quality of Services (QoS). I also taught Fiber Optics Communication and DSP. Inaddition, I supervised groups of students in their under-graduate and Graduate projects. I workedas a researcher in my faculty and published many papers, which will always strengthen my profile as a researcher. We worked as a team with collaborations and understanding. I received two projects funds for my students from ICT, Pakistan.

I worked in the Faculty of Computer Science and Information Technology, B.tech and Electrical Engineering department, Sarhad University of Science and Information Technology Peshawar Pakistan.I taught different subject related to Digital/Analogue Electronics and Communications. Also designed a lab. manual related to Signals and Systems+DSP. I also supervised different group of students in their final year projects at under-graduate level.

I worked as a visiting lecturer in the Faculty of Computer Science and Information Technology, Sarhad University of Science and Information Technology Peshawar Pakistan and taught circuit analysis and VLSI courses during this time.