Results 1 to 10 of about 995 (163)

Sensitivity Deterioration of Free-Space Optical Coherent/Non-Coherent OOK Modulation Receiver by Ambient Light Noise [PDF]

Sensors, 2023
In free-space optical (FSO) communication systems, on–off keying (OOK) is a widely used modulation format. Coherent and non-coherent OOK receivers with sensitivities of −54.60 dBm and −51.25 dBm, respectively, were built with a communication rate of 1 ...
Weijie Ren, Jianfeng Sun, Haisheng Cong, Yuxin Jiang   +3 more
doaj   +2 more sources

Performance analysis and optimization of modulation techniques for underwater optical wireless communication in varied aquatic environments [PDF]

Scientific Reports
Underwater Optical Wireless Communication (UOWC) has emerged as a promising technology for enabling high-speed and low-latency data transmission in aquatic environments.
M. Mokhtar Zayed, Mona Shokair
doaj   +2 more sources

Sub-terahertz transmissive reconfigurable intelligent surface for integrated beam steering and self-OOK-modulation [PDF]

Light: Science & Applications
Boasting superior flexibility in beam manipulation and a simpler framework than traditional phased arrays, terahertz metasurface-based phased arrays show great promise for 5G-A/6G communication networks.
Dongfang Shen, Feng Lan, Luyang Wang, Tianyang Song, Munan Yang, Tianyu Hu, Yueting Li, Xiaolei Nie, Jiayao Yang, Shixiong Liang, Hongxin Zeng, Hui-Fang Zhang, Pinaki Mazumder, Ziqiang Yang, Yaxin Zhang, Tie Jun Cui   +15 more
doaj   +2 more sources

Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

Photonics, 2021
In this paper, we enhance the performance efficiency of the free-space optical (FSO) communication link using the hybrid on-off keying (OOK) modulation, M-ary digital pulse position modulation (M-ary DPPM), and M-pulse amplitude and position modulation ...
Mohammed R. Hayal, Bedir B. Yousif, Mohamed A. Azim   +2 more
doaj   +1 more source

A Comprehensive Comparison and Analysis of Several Intensity Modulations Based on the Underwater Photon-Counting Communication System

Frontiers in Physics, 2022
Underwater wireless optical communication is facing absorption, scattering problems, which, in principle, can be greatly resolved by underwater photon-counting communication (UPCC) technology that exhibits high-sensitivity communication characteristics ...
Xiaotian Han, Xiaotian Han, Peng Li, Chang Chang, Duorui Gao, Dongquan Zhang, Peixuan Liao, Wei Wang, Xiaoping Xie, Xiaoping Xie   +9 more
doaj   +1 more source

Experimental Demonstration of a Visible Light Communications System Based on Binary Frequency-Shift Keying Modulation: A New Step toward Improved Noise Resilience

Sensors, 2023
Visible light communications (VLC) are an emerging technology that is increasingly demonstrating its ability to provide wireless communications in areas where radio frequency (RF) technology might have some limitations.
Cătălin Beguni, Adrian Done, Alin-Mihai Căilean, Sebastian-Andrei Avătămăniței, Eduard Zadobrischi   +4 more
doaj   +1 more source

Multipurpose Laser Instrument for Interplanetary Ranging, Time Transfer, and Wideband Communications

Photonics, 2023
In this paper, we discuss the design and feasibility of a multifunctional laser instrument capable of precision ranging, time transfer, and wideband communications over interplanetary distances throughout our solar system.
John J. Degnan
doaj   +1 more source

Enhancing BPSK and OOK modulations using hybrid 2BPSK-OOK technique for optical fiber communications systems [PDF]

2014 16th International Conference on Transparent Optical Networks (ICTON), 2014
A hybrid 2 slots binary phase shift keying-on off keying (hybrid 2BPSK-OOK) scheme is proposed as a new modulation technique to improve the performance of both conventional binary phase shift keying (BPSK) and on-off (OOK) modulation techniques in optical fiber communications systems.
Hossam A. I. Selmy, Tawfik Ismail, Hossam M. H. Shalaby   +2 more
openaire   +1 more source

Optimal Modulation Technique for Underwater Visible Light Communication Using Rolling-Shutter Sensor

IEEE Access, 2021
The visible light communication (VLC) technique using a rolling-shutter sensor-based commercial camera has an advantage in that the LED and camera mounted on an underwater device (e.g., drone, sensor) can be effectively used as a transmitter (Tx) and a ...
Ritsuki Hamagami, Tadashi Ebihara, Naoto Wakatsuki, Koichi Mizutani   +3 more
doaj   +1 more source

Symmetry 28 Gbps/λ WDM Access Network Together With Confidential Connection Between Two Specific Clients

IEEE Access, 2021
In this work, we demonstrate a symmetry 28 Gbps/ $\lambda $ on-off keying (OOK) wavelength-division-multiplexing passive optical network (WDM-PON) architecture together with confidential connection between two specific optical network units (ONUs).
Chien-Hung Yeh, Bo-Yin Wang, Wei-Hung Hsu, Wen-Piao Lin, Chi-Wai Chow   +4 more
doaj   +1 more source