Prabu Krishnasamy

School of Mechanical Engineering

Chennai Campus

Charanya R

Department of Smart Computing

School of Information Technology and Engineering

Vellore Campus

Jain M

Guha D.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Optics Communications

AbstractA cost-effective spectrum sliced wavelength division multiplexing radio over free space (SS-WDM RoFSO) full duplex communication system architecture has been proposed and analyzed. For the downlink, a 10 Gbits/s high spectrally efficient and amplitude maintaining modified duobinary return to zero (MDRZ) modulated the filtered slices from the light source. The free space optical (FSO) channel was modeled by the well-known Gamma-Gamma model and was further subjected to moderate rain attenuation conditions. Four FSO transceivers were used to mitigate against laser beam scintillation, geometrical losses and rain attenuation. For uplink, a reflective semiconductor optical amplifier (RSOA) was used both as a modulator and an amplifier. Its amplitude squeezing effect was used to erase the information in the MDRZ modulated downstream seeding wavelength for uplink transmission of 10 Gbits/s NRZ OOK signals. At a bit error rate (BER) of $1.262	imes 10^{-9}$, our proposed architecture revealed that 10 Gbits/s symmetric SS-WDM RoFSO can achieve 4.167 km of free space transmission. Power penalty of approximately 0.2 and 3 dB was achieved for downstream and upstream, respectively, which assures the feasibility of the proposed architecture. Such a system is meant to co-exist with the forthcoming fifth generation long-term evolution urban systems.

Fulltext

Journal of Optical Communications

Bidirectional MDRZ Downstream and NRZ OOK Upstream SS-WDM RoFSO Communication System

AbstractWavelength division multiplexing-based free space optics (WDM FSO) has emerged as a potential communication network candidate for last-mile access among other applications. FSO has received much attention in the last few years as a complement as well as an alternative to radio frequency-based communication due to spectrum crisis among other reasons. On the other hand, WDM has been considered as one of the next-generation optical access network candidates for bandwidth efficiency and increased data rates. A hybrid network of these two technologies thus has emerged as another research direction. In this article, we present the background, progress and the current state of WDM FSO.

Review on Wavelength Division Multiplexing Free Space Optics

Spectrum slicing WDM for FSO communication systems under the heavy rain weather

Wireless Personal Communications

BER Analysis for BPSK Based SIM–FSO Communication System Over Strong Atmospheric Turbulence with Spatial Diversity and Pointing Errors

International Journal of Optics

Free Space Optics: Current Applications and Future Challenges

Optik

Performance analysis of FSO links under strong atmospheric turbulence conditions using various modulation schemes

BER analysis of DPSK–SIM over MIMO free space optical links with misalignment

BER analysis of SS-WDM based FSO system for Vellore weather conditions

Journal	Data powered by TypesetOptics Communications
Publisher	Data powered by TypesetElsevier BV
ISSN	0030-4018
Open Access	0