Vishal Sharma

Modeling of Radio over Fiber (RoF) system incorporating multi-carrier multiplexing

Radio over Fiber system is a promising technology to fulfill elevated demand of capacity and high data rate. The performance of RoF system is severely degraded due to presence of nonlinear distortions for instance inter-modulation distortion and harmonic distortion. Accordingly, orthogonal frequency division multiplexing (OFDM) scheme is being proposed for the deployment of long-reach, high-speed and high-capacity RoF system in this work. This work demonstrates to implement OFDM-RoF system embodying OSSB, ODSB and OTSB modulation schemes. Further, to recommend a suitable Radio over Fiber system for meeting the increasing demand of real time high-speed broadband mobile services, a contrast is drawn against conventional RoF system in this work.

Performance analysis of bidirectional hybrid orthogonal frequency division multiplexing-Ethernet passive optical access network

For the bottleneck problem of broadband access networks, the Ethernet passive optical network comes out as a striking and promising solution. Even though, Ethernet passive optical network nodes necessitate a cost-effective up-gradation. Accordingly, we propose and demonstrate a hybrid orthogonal frequency division multiplexing-Ethernet passive optical network employing an optical single side band modulation scheme. Case A demonstrates a contrast between a symmetric bidirectional single channel orthogonal frequency division multiplexing-Ethernet passive optical network at a data rate of 10 and 5 Gbps after a fiber link of 20 km. Case B targets the transmission of a symmetric bidirectional single channel orthogonal frequency division multiplexing-optical single side band-Ethernet passive optical network system and achieves a fiber link of 20 km with a split ratio of 8. Afterwards, eight upstream channels are transmitted simultaneously and successfully obtained at the optical linear terminal side to make a bidirectional Ethernet passive optical network system. Further, a contrast between transmission at a data rate of 10 and 5 Gbps is carried out that achieves a fiber link of 20 km with a split ratio of 8.

Convergence of Bidirectional PON with Single-Sink Wireless Sensor Network Using Queue Theory

Nowadays, wireless sensor networks (WSNs) have deployed for variety of applications, such as health monitoring, military, civil, environmental monitoring, video surveillance. The limited energy of sensor nodes restricts the broadcasting range. As limited energy restricts the transmission link of such network, the need to backhaul the sensed data arises to receive sensed data at distant location. Passive Optical Network (PON), a next-generation access technology, comes up as an appropriate contender to converge the WSNs to the core system. In this paper, the investigations are reported for convergence of single-OLT PON and single-sink WSN model incorporating M/M/1 queue theory. Further, the converged WSN–PON structure extended to bidirectional link, evaluated analytically and through computer simulation in terms of queue length, end-to-end delay, packet generation rate and time cycle. The outcomes reveal the achievability of converged network, the resource allocation, and resource utilization.

Influence of advance coding formats over turbulent effected FSO link

FSO systems are speedily attaining attractiveness for delivering various communication services and have become one of the preferred high-speed media. The primary challenge for FSO systems is atmospheric conditions that result in degradation of signal strength. In this paper, the impact of advance line-coding over FSO link subjected to different turbulent conditions has been investigated. The proposed system has accomplished a useful improvement under the impact of diverse turbulence conditions due to the implementation of CSRZ and AMI coding over FSO link of 9 Km at high data rate.

Theoretical Investigation of XPM Induced Crosstalk under the Impact of Higher Order Dispersion (HOD) in SCM-WDM Transmission Link

Abstract In this work, an effort has been attempted for the comprehensive theoretical analysis to evaluate the impact of higher order dispersion (HOD) coefficients on non-linear crosstalk in SCM–WDM communication systems. The results are obtained to compute the inter-channel crosstalk due to XPM fiber nonlinearity under the individual influence of 2OD-, 3OD-, 4OD- and 5OD-coefficient at different modulation frequencies. The results are reported at varied values of optical span and input channel power, as these both parameters enhance the amount of crosstalk due to fiber nonlinearity in the SCM-WDM systems. This work is also carried out by taking into consideration of the different values of modulation index and walk-off parameter.