Performance enhancement of an orbital-angular-momentum-multiplexed free-space optical link under atmospheric turbulence effects using spatial-mode multiplexing …

BB Yousif, EE Elsayed - IEEE access, 2019 - ieeexplore.ieee.org
In this paper, we propose an adaptive multiple-input-multiple-output (MIMO) free-space
optical (FSO) links using an orbital-angular-momentum (OAM)-multiplexed based on the …

Investigations on wavelength-division multiplexed fibre/FSO PON system employing DPPM scheme

EE Elsayed, AG Alharbi, M Singh, A Grover - Optical and Quantum …, 2022 - Springer
In this paper, we propose and enhance the performance of a wavelength-division
multiplexed hybrid fibre/free-space optics passive optical network (PON) system. The …

Performance enhancement of the average spectral efficiency using an aperture averaging and spatial-coherence diversity based on the modified-PPM modulation for …

EE Elsayed, BB Yousif - Optics Communications, 2020 - Elsevier
The performance evaluation and enhancement of the proposed model for a free-space
optical (FSO) communication links using the modified pulse-position modulation (MPPM) …

Ultra-high capacity long-haul PDM-16-QAM-based WDM-FSO transmission system using coherent detection and digital signal processing

P Sivakumar, CS Boopathi, MG Sumithra… - Optical and Quantum …, 2020 - Springer
The ever-increasing demand for wide channel bandwidth, high-speed information, and
spectral-efficient communication links with advanced modulation schemes has led to the …

Development of high-speed FSO transmission link for the implementation of 5G and Internet of Things

V Dhasarathan, M Singh, J Malhotra - Wireless Networks, 2020 - Springer
Abstract Internet of Things (IoT) enables the inter-connectivity of different “things” using
which wide range of items and devices can communicate with each other and their external …

[HTML][HTML] Performance evaluation of 6.4 Tbps dual polarization quadrature phase shift keying Nyquist-WDM superchannel FSO transmission link: Impact of different …

M Singh, J Malhotra, MSM Rajan… - Alexandria Engineering …, 2020 - Elsevier
This work reports the development of an ultra-high capacity Nyquist-wavelength division
multiplexing (WDM) superchannel based free space optics (FSO) transmission link. In the …

[HTML][HTML] A long-haul 100 Gbps hybrid PDM/CO-OFDM FSO transmission system: impact of climate conditions and atmospheric turbulence

M Singh, J Malhotra, MSM Rajan… - Alexandria Engineering …, 2021 - Elsevier
The reliability and efficiency of free space optics (FSO) systems is significantly degraded by
attenuation caused by different climate conditions and atmospheric turbulence. In this work …

Performance comparison of M-QAM and DQPSK modulation schemes in a 2× 20 Gbit/s–40 GHz hybrid MDM–OFDM-based radio over FSO transmission system

M Singh, J Malhotra - Photonic Network Communications, 2019 - Springer
This work is focused on the modeling and performance investigation of a 2× 20 Gbit/s–40
GHz hybrid mode division multiplexing–orthogonal frequency division multiplexing-based …

Free space optical communication using OQPSK in the presence of strong atmospheric turbulence and losses

VV Belgaonkar, CL Triveni, R Sundaraguru - Optical and Quantum …, 2024 - Springer
Free space optical communication (FSO) is designed using the orthogonal quadrature
phase shift keying (OQPSK) modulation technique. The system performance is evaluated for …

Investigation of 340-Gbps terrestrial FSO link incorporating spectral-efficient DP-QPSK-PolSK hybrid modulation scheme

M Singh, J Malhotra, A Atieh, D Kakati… - Optical …, 2020 - spiedigitallibrary.org
A high-capacity spectral-efficient dual-polarization quadrature phase-shift keying (DP-
QPSK)-polarization shift-keying (PolSK) hybrid modulation scheme for terrestrial free-space …