Results 161 to 170 of about 3,977 (207)

A battery recharge model for WSNs using Free-Space Optics (FSO)

2008 IEEE International Multitopic Conference, 2008
One of the most critical limiting factor for a Wireless Sensor Network (WSN) is its battery life. Therefore, a very desirable feature of WSN would be its rechargability to remain operational over longer period of times. However, the nodes needing recharge may not be accessible. In this paper, we present a battery recharge model in WSNs for inaccessible
Muhammd Imran Afzal, Waqar Mahmood, Ali Hammad Akbar   +2 more
openaire   +1 more source

Local multipoint distribution system (LDMS) versus free-space optical (FSO) networks

SPIE Proceedings, 2001
This paper compares two emerging broadband access methodologies, Free Space Optics (FSO) and Local Multipoint Distribution System (LMDS) and the atmospheric propagation characteristics of each when exposed to a dynamically changing channel. The comparison focuses on bandwidth, availability, and distance requirements for the new broadband market and how
Heinz A. Willebrand, Gerald R. Clark, Bryan Willson, Christian G. Andreu von Euw, Joe Roy, Laurel M. Mayhew   +5 more
openaire   +1 more source

Fundamentals of Free-Space Optical (FSO) Communication System

2014
Free-space optical (FSO) must be included in the set of solutions for meeting the bandwidth requirements of the modern internet. FSO communication is the most practical alternative to solve the bottleneck broadband connectivity problem, and as a supplement to conventional radio frequency (RF)/microwave links.
openaire   +1 more source

Bidirectional free space optical communication (FSO) in WDM access network with 1000-m supportable free space link

Optics Communications, 2019
Abstract In this demonstration, we propose and investigate experimentally a bidirectional wavelength-division-multiplexed (WDM) free space optical communication (FSO) system integrated with fiber access network for wireless traffics. Here, there are four 10 Gbit/s on–off keying (OOK) WDM-FSO signals would propagate through a 25 km single-mode fiber ...
Chien-Hung Yeh, Bo-Shen Guo, Yao-Jen Chang, Chi-Wai Chow, Chong-Sin Gu   +4 more
openaire   +1 more source

Modulating Retroreflector-based Free-space Optical (FSO) Communications

2014
In this chapter, the niche area of free-space laser communications and data links which use modulating retroreflectors, or retro-modulators, will be discussed. This is a growing area of interest since technology can now support “shutters” that can achieve usable communications rates.
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Mitigation Techniques for Improved Free-space Optical (FSO) Communications

2014
Modern free-space optical (FSO) communications need to be robust and seamless, providing high bandwidth at the right quality of service to both communication terminals in presence of various atmospheric conditions. This means that FSO communications need to have improved reliability when operating in adverse atmospheric conditions.
openaire   +1 more source

Performance Evaluation of Free Space optics (FSO) Using Diffractive Optical Elements (DoE) and its Comparison with Existing Free Space Optics (FSO)

2023 International Conference on Recent Advances in Science and Engineering Technology (ICRASET), 2023
Gaurav Soni, Manish Sharma
openaire   +1 more source

Circular polarization and availability in free space optics (FSO) communication systems

2010 IEEE Latin-American Conference on Communications, 2010
A great variety of atmospheric phenomena such as absorption, dispersion and turbulence can cause big variations in the attenuation of the beam of light of a laser. The absorption and the turbulence can be measured by means of a system free space optics (FSO) designed appropriately.
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Modulation, Detection, and Coding for Free-space Optical (FSO) Communications

2014
The process of modulation consists of mapping the information onto magnetic medium (a carrier). There are mainly three parameters of the carrier which can be varied to perform the modulation process for mapping the information into changes in either the amplitude, phase, or frequency of the carrier.
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Mobile Free Space Optics (FSO) Market Overview 2024–2030

The global Mobile FSO market is rapidly growing due to expanding 5G networks, increased internet penetration, and rising digitalization. However, high costs and sensitivity to atmospheric conditions limit its adoption, while ongoing technological innovations offer significant future opportunities.
openaire   +1 more source