Spectral response and sensitivity of tilted fiber Bragg gratings (TFBG) under low-temperature and strain conditions Anjali S Kotian, Vivekanand Mishra Physica Scripta, 2026 In this study, we advance our understanding of dual parameter sensing in TFBGs through detailed modelling and highlight the ongoing and future directions for improving sensor design. The TFBGs structures of strain and low temperature measurement are thoroughly analysed in this study. The TFBGs structures with tilt angles of 4°, 8°, 12°and 16° were modelled analytically by Coupled Mode Theory (CMT) and the Transfer Matrix Method (TMM), taking into consideration applied strain levels within a range of 100–500 μ ε and subzero temperatures from –5 °C to –40 °C. Simulated results show that the temperature sensitivity increases linearly from 11.31 pm °C −1 at 4° to 11.74 pm °C −1 at 16°. Similarly, strain sensitivity increases from 1.21 pm μ ε −1 to 1.26 pm μ ε −1 across the same tilt range. High sensing performances are achieved by TFBGs with moderate tilt angles (4°–16°) within the C and L-band range, maintaining high sensitivity and with good compatibility with standard optical components. This study shows how TFBGs can be optimized with respect to their tilt angle in order to enhance their dual-parameter response and contributes to the development of accurate fiber-optic sensors applied to cryogenic, structural, and biomedical monitoring.
Neural Network Innovations in Next-Generation Optical Fiber and WDM Networks: Tackling Signal Degradation and Resource Optimization Shivranjani Bharatbhai Gajjar, Vivekanand Mishra 2025 International Conference on Pervasive Computational Technologies Icpct 2025, 2025 Neural networks have been included in optical fiber communication along with WDM networks, which have demonstrated new paths for increasing such systems' performance, availability, and effectiveness. Optical fiber communication used for high data rates suffers from signal attenuation, noises and nonlinearities, especially at longer transmission distances. Neural networks provide solutions through identifying/recognizing complicated signal patterns and at the same time correcting the existing distortions on a real-time basis. They can be used for such applications as signal equalization, nonlinearity correction, and noise removal, and can enhance data transfer quality by many times. When several data channels are carried out simultaneously using different wavelengths, it is found that neural networks are very effective in controlling the WDM networks. They are capable of predicting the traffic pattern, doing dynamic resource allocation efficiently, and providing an optimized routing and wavelength assignment (RWA) model compared to conventional techniques. In addition, with the development of neural networks, OPM functions are brought to a higher level in terms of speed and accuracy of the assessment of other important optical metrics, including OSNR and chromatic dispersion. Furthermore, such networks can also recognize possible faults, thus providing stable and reliable communication. A continued increase in the requirement of data transmission rate makes the use of neural networks in optical fiber communication and WDM systems crucial in handling the main issue, providing innovative and optimized solutions for future-generation communication systems
Enhancing high-speed networks using RGB-based WLAN through Ro-FSO integration in the 5GHz band Abhishek Sharma, Vivekanand Mishra Journal of Optical Communications, 2024 The limited bandwidth constraints imposed by conventional wireless carriers pose a significant hurdle when it comes to the delivery of high-speed broadband services. In response to this challenge, Radio over Free Space Optics (Ro-FSO) has emerged as a viable and innovative solution, seamlessly amalgamating wireless and optical systems. This integration proves particularly invaluable in sensitive environments, such as hospitals, where the risk of electromagnetic interference disrupting critical medical equipment is a real concern. Ro-FSO offers a disruption-free avenue for high-speed data transmission, positioning it as the ideal choice for broadband services, including Wireless Local Area Networks (WLANs). Within the scope of this study, we introduce a high-speed Ro-FSO link, showcasing the capability to concurrently transmit three independent channels with Red, Green and Blue (RGB) laser respectively, each supporting a robust 1 Gbps data rate. These data streams are skilfully up-converted to the 5 GHz RF bands, encompassing transmission distances of 650 m across the FSO channel. Our numerical simulation findings underscore the successful transmission of all the channels using wavelength division multiplexing (WDM), seamlessly meeting the prescribed Bit Error Rate (BER) and eye pattern criteria, solidifying the Ro-FSO’s standing as a promising solution for high-speed broadband delivery.
Differential Amplifier for Biomedical Signal Acquisition Applications Based on Stacked Transistors Prateek Jain, Vivekanand Mishra, Sandip A. Mehta Radioelectronics and Communications Systems, 2024 Abstract This study presents a two-stage differential amplifier circuit that has been improved for use in a realistic biomedical signal conditioning system. CMOS technology serves as the foundation for the circuit. A MOS-based low-pass filter using stacked transistors creates a low-power differential amplifier with low noise and high common-mode rejection ratio (CMRR) for portable electrocardiogram (ECG) signal conditioning. Stack transistors with MOS connected at the output terminal are used to improve the design for electrocardiogram (ECG) signal conditioning and other types of signal conditioning for biomedical devices. Standard 45nm CMOS process technology was used in the construction of the amplifier that is being discussed. The amplifier runs at a supply voltage of 0.85 V. The simulation findings are produced using the Cadence Analogue Virtuoso Spectre Simulator to generate the simulation. The differential amplifier described demonstrates a CMRR = 140 dB at frequency of 80 Hz, a power supply rejection ratio (PSRR) of 68 decibels, and a power dissipation of 1.3 μW. These characteristics conform to the simulation results. While the slew rate is 11 V/s, the input-referred noise is 2.62 μV/Hz1/2. Compared to the conventional differential amplifier, the performance characteristics generated by this approach are better and more efficient than those created by the standard circuit. The proposed design improves the noise performance of the differential amplifier developed in the past, which enhances noise performance.
Hybrid RoF-RoFSO system for broadband services by incorporating polarization division multiplexing scheme Abhishek Sharma, Vivekanand Mishra, Kuldeep Singh, Jyoteesh Malhotra Journal of Optical Communications, 2024 The limited bandwidth of traditional wireless carriers presents a challenge for delivering high-speed broadband services. To address this, radio-over-free space optics (Ro-FSO) emerges as a viable solution, seamlessly integrating wireless and optical systems. This integration is particularly valuable in sensitive environments such as hospitals, where electromagnetic interference can disrupt medical equipment. Ro-FSO provides interference-free high-speed data transmission, making it an ideal choice for broadband services, including WLANs. This study presents a high-speed Ro-FSO link capable of simultaneously transmitting two independent channels, each carrying 1 Gbps data up-converted to the 2.4 GHz and 5 GHz RF bands over a 5 km SMF and 4200 m FSO channel. The incorporation of polarization division multiplexing enhances the spectral efficiency of the Ro-FSO link. Our findings demonstrate the successful transmission of both channels meeting the required bit error rate (BER) and eye pattern criteria.
Study of optimization of virtual topology for wavelength-routed networks in the presence of dynamic traffic demand Shivranjani B. Gajjar, Vivekanand Mishra Proceedings of SPIE the International Society for Optical Engineering, 2024 This research examined the optimum requirements for revamping virtual topology for wavelength-routed networks under dynamic traffic demand for mesh physical topology networks. We analysed the optimization of congestion and entire output using the Yen’s K-shortest path algorithm, which is a new approach to investigate the optimum condition for transmission according to time and the number of users. We also consider energy usage during optimal path selection. Previous studies have primarily focused on providing configuration strategies exclusively for selected light paths, with limited consideration for the overall physical topology configuration. Contrarily, the method proposed in this paper can be applied to optimize light path scenarios across various physical topologies.
Optimizing optical loop infrastructure for high-speed switching and efficient buffering Rashmi Rashmi, Vivekanand mishra, SUKRITI Sukriti Proceedings of SPIE the International Society for Optical Engineering, 2024 The integration of the storage of optical data using fiber loops and extremely rapid optical based switching via nonlinear optical loop mirrors (NOLMs) are recognized as an optimal approach for all-optical processing. This article presents a novel integration of these technologies to create an efficient buffering-switching device aimed at mitigating signal contention. Through thorough analysis, we explore the limitations of this integrated device in achieving error-free processing across multiple buffering cycles. Various factors, such as different types of noise leading to fluctuations in intensity of buffered and demultiplexed signals, are assessed. Additionally, we delve into the switching characteristics of NOLM demultiplexer to provide a comprehensive understanding of the device's performance.
Efficient Wireless Charging System Dhanashree Khamgal, Nikita Khamgal, V. Mishra, Shubhangi Potdar Proceedings of the 2nd International Conference on Edge Computing and Applications Icecaa 2023, 2023
From the desk of convener, organizing committee Proceedings on 2014 2nd International Conference on Emerging Technology Trends in Electronics Communication and Networking Et2ecn 2014, 2015
A review on quantum computing and communication G Arun, Vivekanand Mishra Proceedings on 2014 2nd International Conference on Emerging Technology Trends in Electronics Communication and Networking Et2ecn 2014, 2015
Fabrication and characterization of radome structure Surabhi Dwivedi, Vivekanand Mishra, Yogesh P. Kosta Proceedings on 2014 2nd International Conference on Emerging Technology Trends in Electronics Communication and Networking Et2ecn 2014, 2015
Dependence of oxidation process on various oxidizing conditions Kumar Prashant, Rasika Dhavse, Vivekanand Mishra Proceedings on 2014 2nd International Conference on Emerging Technology Trends in Electronics Communication and Networking Et2ecn 2014, 2015
Design and deployment of Wi-Fi service inside running metro trains Aditya Prajapati, Dhaval Rawal, Piyush N. Patel, Vivekanand Mishra Proceedings on 2014 2nd International Conference on Emerging Technology Trends in Electronics Communication and Networking Et2ecn 2014, 2015
Nano scale porous silicon microcavity optical sensor device for the detection of methyl parathion Digest Journal of Nanomaterials and Biostructures, 2012
Nano porous silicon microcavity optical biosensor device for glucose detection Digest Journal of Nanomaterials and Biostructures, 2012
Numerical analysis of remotely pumped EDFA incorporated with a CFBG Proceedings of the 7th IASTED International Conferences on Wireless and Optical Communications Woc 2007, 2007
