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Light beams with orbital angular momentum for free space optics

Chinese Physics B 2007年第5期16卷 1334-1338页

作者：武京治李仰军 Key Laboratory of Instrumentation Science & Dynamic Measurement (North University of China) Ministry of Education Taiyuan 030051 China

The light＇s orbital angular momentum （OAM） is a consequence of the spiral flow of the electromagnetic energy. In this paper, an analysis of light beams with OAM used for free space optics （FSO） is conducted. The basic description and conception of light＇s OAM are reviewed. Both encoding information into OAM states of single light beam and encoding information into spatial structure of the mixed optical vortex with OAM are discussed, and feasibility to improve the FSO＇s performance of security and obstruction of line of sight is examined.

关键词： orbital angular momentum free space optics pseudo-nondiffracting beams

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Performance Analysis of Curved Track G2T-FSO(Ground-to-Train free space Optical)Model under Various Weather Conditions

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Computer Modeling in Engineering & Sciences 2024年第12期141卷 2087-2105页

作者： Mohammed A.Alhartomi Mohammad F.L.Abdullah Wafi A.B.Mabrouk Mohammed S.M.Gismalla Ahmed Alzahmi Saeed Alzahrani Mohammad R.Altimania Mohammed S.Alsawat Department of Electrical Engineering University of TabukTabuk71491Saudi Arabia Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia(UTHM)Johor86400Malaysia Center for Communication Systems and Sensing King Fahd University of Petroleum and Minerals(KFUPM)Dhahran31261Saudi Arabia Department of Mechanical Engineering University of TabukTabuk71491Saudi Arabia

The demand for broadband data services on high-speed trains is rapidly growing as more people commute between their homes and ***,current radio frequency(RF)technology cannot adequately meet this *** order to address the bandwidth constraint,a technique known as free space optics(FSO)has been *** paper presents a mathematical derivation and formulation of curve track G2T-FSO(Ground-to-train free space Optical)model,where the track radius characteristics is 2667 m,divergence angle track is 1.5°for train velocity at V=250 km/*** transmitter configurations are proposed to maximize coverage range and enhance curve track G2T-FSO link performance under varying weather *** curved track G2T-FSO model was evaluated in terms of received power,signal-to-noise ratio(SNR),bit error rate(BER),and eye *** results showed maximum coverage lengths of 618,505,365,and 240 m for 4Tx/1Rx,3Tx/1Rx,2Tx/1Rx,and 1Tx/1Rx configurations,*** analyzed results demonstrate that the G2T-FSO link can be effectively implemented under various weather conditions.

关键词： free space optics curve track ground-to-train communications geometrical loss weather conditions

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Optical power allocation for adaptive transmissions in wavelength-division multiplexing free space optical networks

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Digital Communications and Networks 2015年第03期1卷 171-180页

作者： Hui Zhou Shiwen Mao Prathima Agrawal Department of Electrical and Computer Engineering Auburn University Amazon Web Service Amazon Inc.

Attracting increasing attention in recent years, the free space optics(FSO) technology has been recognized as a cost-effective wireless access technology for multi-Gigabit rate wireless networks. Radio on free space optics(Ro FSO) provides a new approach to support various bandwidth-intensive wireless services in an optical wireless link. In an Ro FSO system using wavelength-division multiplexing(WDM), it is possible to concurrently transmit multiple data streams consisting of various wireless services at very high rate. In this paper, we investigate the problem of optical power allocation under power budget and eye safety constraints for adaptive WDM transmission in Ro FSO networks. We develop power allocation schemes for adaptive WDM transmissions to combat the effect of weather turbulence on Ro FSO *** results show that WDM Ro FSO can support high data rates even over long distance or under bad weather conditions with an adequate system design.

关键词： free space optics Radio over free space optics Wavelength-division multiplexing

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THE INTERFACE OF FSO SYSTEM BASED ON USB2.0

THE INTERFACE OF FSO SYSTEM BASED ON USB2.0

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浙江省光学学会第九届学术年会暨新型光电技术青年论坛

作者： Hu Sheng Lin Bin China National Engineering Research Center for Optical Instrument, Zhejiang University, Hangzhou 310027

A USB interface applied to FSO system is formulated in this paper. Two Computers can communicate by this interface. It has many advantages such as high speed, easy installation, less resource occupation. This paper di... 详细信息

关键词： USB Interface free space optics

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