Dr. Rahul Kaushik received his B. Tech. (Electronics and Telecommunication Engineering) and M.Tech. (Electronics Engineering) degrees from University of Allahabad, India in 2001 and 2003 respectively. He has completed his Ph. D. in the area of Optical Wireless Communication from Jaypee Institute of Information Technology, Noida, India in 2017. He combines 18 years of teaching and research experience in the field of Electronics and Communication Engineering. He has joined Jaypee Institute of Information Technology (JIIT), Noida, India in July, 2007. Presently, he is designated as Associate Professor. Prior to this, he served G.L Bajaj Institute of Technology and Management, Greater Noida as Assistant Professor and Head of ECE department.
RESEARCH, TEACHING, or OTHER INTERESTS
Electrical and Electronic Engineering, Computer Networks and Communications
40
Scopus Publications
Scopus Publications
CNN based prediction of modulation techniques in Li-Fi Aryan Singh Pundir, Rahul Kaushik, Prashast Pathak Journal of Optical Communications, 2026 Visible light communication (VLC) being a key component of light-fidelity (Li-Fi), requires adaptive and efficient modulation techniques to guarantee reliable data transmission under varying channel conditions. This study focuses on the prediction of modulation techniques in VLC systems, namely, on-off keying (OOK), pulse position modulation (PPM): 4-PPM, 8-PPM and 16-PPM, 4 – differential pulse interval modulation (DPIM), orthogonal frequency division multiplexing (OFDM) and generalized space shift keying (GSSK), using machine learning based approach. A convolutional neural network (CNN) is trained on a synthetic dataset which is generated under varying channel conditions and noise levels. The trained model is then used to classify modulation techniques based on signal features extracted from simulated VLC signals. The model is then exported and used to predict modulation techniques in a different dataset. The outcomes demonstrate CNNs’ effectiveness in real time modulation technique prediction. This method presents a viable way to boost Li-Fi communication effectiveness in varying environments.
An 80 Gbps dual multiplexed secure transmission over FSO link using chaotic masking Ankur Sood, Rahul Kaushik, Shraddha Sood Journal of Optical Communications, 2026 A secured optical chaotic transmission using radio over free space optical (RoFSO) link is proposed. A dual multiplexed configuration is implemented to enhance the data transmission rate and channel capacity. Chaotic masking is done for individual data stream before multiplexing at MDM and PDM levels. Enhanced security level and low signal attenuation is observed while transmitting through RoFSO link. The FSO link performance is analyzed for various atmospheric attenuation and turbulence conditions. For weak to moderate and strong turbulence conditions, the FSO link is analyzed for various haze, rain, fog and dust conditions. The system bit error rate (BER), Q-factor, signal to noise ratio (SNR) and received signal power is observed while analyzing eye diagram, signal spectrum and electric constellation etc. Results show enhanced channel capacity and extended link range while using chaos based synchronous transmission.
Spatially multiplexed OFDM - RoFSO transmission under different atmospheric conditions Ankur Sood, Rahul Kaushik Journal of Optical Communications, 2025 In this paper, a spatially multiplexed, OFDM-based radio over free space optical (RoFSO) communication system is proposed to enhance the data rate. The input data streams 1–4 are combined using space division multiplexing (SDM) to achieve 80 Gbps (4 × 20 Gbps) transmission rate. At SDM level, an optical carrier of 193.1 THz frequency is selected and various Laguerre Gaussian (LG) modes LG00, LG01, LG02, and LG03 are assigned to individual data streams 1–4. The RoFSO link is analyzed for different atmospheric attenuation and turbulence conditions while measuring system bit error rate (BER), Q-factor, received signal power, signal to noise ratio (SNR), etc. A comparative analysis for back to back (B2B), subcarrier multiplexed (SCM-MUX), wavelength division multiplexed (WDM-MUX), and space division multiplexed (SDM-MUX) configuration is carried out. In FSO environment, the SDM-MUX configuration is further analyzed for various haze, rain, fog, and dust conditions. Analysis shows that the extended link range is observed under low attenuation conditions. The impact of atmospheric turbulence under light rain and heavy rain conditions is also analyzed. The overall analysis estimates higher transmission rate for SDM-MUX configuration. Also, channel capacity can be enhanced by introducing additional optical modes for the selected design configuration.
Secured multiplexed optical fiber transmission scheme using chaotic signal Rahul Kaushik, Vineet Khandelwal, Ankur Sood Journal of Optical Communications, 2025 A secure optical transmission through fiber link is proposed where chaotic masking of original signal is implemented. The chaotic based transmission is largely preferred for long distance communication that includes personal, commercial and military applications. The information in secure communication system is concealed by the chaotic signal. By integrating unpredictable chaotic signal with input data stream, the system effectively masks transmitted information, rendering it indistinguishable from random noise to unauthorized entities. In proposed design, channel capacity is enhanced by implementing wavelength division multiplexing (WDM) and polarization division multiplexing (PDM) to simultaneously send data over eight multiplexed streams at high speed. A detailed simulation, demonstrates reliable data recovery at the receiver via synchronized chaos generation and optical subtraction. This achieves secure and high-speed transmission with low bit error rate (BER) and improved received power levels over longer distances. The system performance is analyzed for BER, Q-factor, received power and signal to noise ratio (SNR) levels.
Wavelength division multiplexed radio-over-fiber (WDM-RoF) system for next-generation networks with dispersion compensating fiber Pooja Goel, Rahul Kaushik Journal of Optical Communications, 2024 Radio-over-fiber (RoF) is a technology in which radio frequency (RF) signals are distributed from central station to remote antenna units using fiber. Wavelength division multiplexing (WDM) is a technique in which different data streams are allowed to be sent parallely over a single fiber at different frequencies for increasing bandwidth. Hence, RoF combined with WDM technology is a prominent solution for many applications. In this article, we have designed an 8-channel 40 Gbps WDM-RoF system for future generation networks. The performance of the system has been evaluated using a simulator and then compared with a 4-channel existing system. A dispersion compensating fiber with a dispersion value at −85 ps/nm/km is used for combating nonlinearity. The simulated 8-channel WDM-RoF system has been analyzed by varying bit rate, input power, number of loops (transmission span), and channel spacing using performance parameters such as Q-factor and BER. It has been observed that the performance of the network improved as the channel spacing increased from 50 to 200 GHz. Moreover, the system performance is reliable up to 200 km.
Performance analysis of 160 Gbps-60 GHz OFDM-MIMO RoFSO transmission with WDM-PDM dual multiplexing Ankur Sood, Rahul Kaushik Journal of Optical Communications, 2024 An orthogonal frequency division multiplexed-radio over free space optics (OFDM-RoFSO) communication system with dual multiplexing is proposed. Eight input data streams are transmitted simultaneously by using wavelength division multiplexing (WDM) at level 1 and polarization division multiplexing (PDM) at level 2. Input data streams 1–4 and 5–8 are assigned with same set of carrier frequencies i.e. 193.1 THz, 193.3 THz, 193.5 THz and 193.7 THz and separate polarization levels (X and Y polarized) before transmitting through RoFSO link. A total data rate of 160 Gbps (4 × 2 × 20 Gbps) is achieved in this design. With proposed system, channel performance is evaluated under the influence of atmospheric attenuation and turbulence conditions while measuring system BER, Q-factor, SNR and received power etc. The effect of channel crosstalk is analysed for WDM-PDM dual multiplexed design while considering single input single output (SISO) and multiple input multiple output (MIMO) FSO configurations. The overall analysis predicts that a higher transmission rate and improved capacity levels can easily be achieved with dual multiplexed system.
Mitigation of attenuation due to weather conditions in optical wireless systems over log-normal channels using aperture averaging International Journal of Microwave and Optical Technology, 2016