Free-space optical propagation of pulse coded data stream

2003 ◽  
Author(s):  
Xiaohui Ni ◽  
Qirong Xing ◽  
Wei Cai ◽  
R. R. Alfano
Keyword(s):  
Free Space ◽  
Data Stream ◽  
Free Space Optical ◽  
Optical Propagation

Protocol Design for Free Space Optical (FSO) Communication

2015 ◽  
Vol 738-739 ◽  
pp. 1178-1184
Author(s):  
Ru Hai Guo ◽  
Chang Shun Liu ◽  
Heng Kun Wang ◽  
Jin Wu ◽  
Jun Feng Chong
Keyword(s):  
Free Space ◽  
Data Stream ◽  
Great Influence ◽  
Exception Handling ◽  
Free Space Optical ◽  
System Integrity ◽  
Serial Data ◽  
Fpga Chip ◽  
Signal Channel ◽  
Wired Communication

A new transceiving protocol is designed for an FSO communication system, and it’s discussed from the transmitting protocol and the receiving protocol. Different from wired communication, a FSO system modulates the data on a narrow beam of laser transmitting through the free space or the atmosphere, and the protocol is optimized for terrestrial FSO links. Due to the complex composition and activity of the atmosphere, this signal channel brings in great influence on the transmitting laser in it. The function of the receiving protocol includes filtering and synchronizing the input serial data stream, paralleling the serial data stream, decoding the input data, error checking, and exception handling and interfacing the outer receiver with a parallel port. The transceiving protocol could be programmed into a single FPGA chip to improve system integrity and reduce the system cost. We also test the hardware platform and communication protocol and give the waveform. The experiment and Simulation prove that the protocol presented can work well at a certain bit rate scale.

scholarly journals MITIGATING THE INFLUENCE OF DENSE OIL FIRES ON FREE-SPACE OPTICAL COMMUNICATION

2020 ◽  
Vol 3 ◽  
pp. 69-74
Author(s):  
Thoalfiqar Ali Zaker ◽  
Talib Zeedan Taban ◽  
Firas S. Mohammed
Keyword(s):  
Free Space ◽  
Divergence Angle ◽  
Q Factor ◽  
Free Space Optical ◽  
Beam Angle ◽  
Eye Diagram ◽  
Optical Propagation ◽  
Space Optical Communication ◽  
Eye Opening

This study estimates the performance of a free space optical system (FSO) affected by air pollutants from oil fires. Simulations are performed to evaluate the reliability of optical propagation according to the length of the FSO channels under two beam angle angles. The proposed FSO system parameters such as the Q-factor, BER and reception capacity are successfully used to reduce channel loss. Results demonstrate that the proposed FSO link performs satisfactorily when the divergence angle is 1 mrad and the distance is from 0.5 km to 0.9 km. Q-factor and receiving power decrease when the divergence angle of beam increases to 2 mrad, and a link is achieved when the distance is from 0.5 km to 0.7 km. The eye diagram is used to evaluate and confirm the quality of received data. An eye opening is observed at 0.5 km for both divergence angles. Then, the eye completely closes at 1 km for 2 mrad, thereby degrading the performance. Therefore, these results can be conducted for similar systems optimization options by applying our analysis

Measurement and simulation of the effect of snowfall on free-space optical propagation

2008 ◽  
Vol 47 (31) ◽  
pp. 5736 ◽  
Author(s):  
Makoto Akiba ◽  
Kayo Ogawa ◽  
Kazuhiko Wakamori ◽  
Kashiko Kodate ◽  
Shigeo Ito
Keyword(s):  
Free Space ◽  
Free Space Optical ◽  
Optical Propagation

Optical Wireless Communications in Vehicular Systems

2013 ◽  
pp. 209-222
Author(s):  
Matthew Higgins ◽  
Zeina Rihawi ◽  
Zaiton Abdul Mutalip ◽  
Roger Green ◽  
Mark S. Leeson
Keyword(s):  
Wireless Communications ◽  
Free Space ◽  
Optical Wireless ◽  
Engine Compartment ◽  
Free Space Optical ◽  
Optical Wireless Communications ◽  
Wireless Links ◽  
Optical Propagation ◽  
Basic Understanding ◽  
Network Topologies

This chapter reviews some of the network topologies and technologies within current vehicular systems. This is then followed by a proposal from the authors with initial viability results, into the possibility of implementing optical wireless links to either replace or complement these existing ideas. The initial motivation for this work (Green, 2010) is that there exist multiple pathways within a vehicle such as the engine compartment, within the frame of the chassis, or the internal cockpit that all lend themselves nicely to free space optical propagation. The first specialised study on the viability of optical wireless communications within the vehicles cabin was then published in (Higgins et al, 2012) which provided a further impetus to the concept. It is hoped that through the original results presented here, the reader can gain a basic understanding of the concepts compared to the current technologies, and are then able instigate their own research ideas.

Power distribution of short free space optical propagation

2014 ◽  
Author(s):  
Pirmin Pezzei ◽  
Clemens Wurster ◽  
Michael Wollitzer ◽  
Martin Fuchs ◽  
Erich Leitgeb
Keyword(s):  
Power Distribution ◽  
Free Space ◽  
Free Space Optical ◽  
Optical Propagation

Characterization of Fog and Snow Attenuations for Free-Space Optical Propagation

2009 ◽  
Vol 4 (8) ◽  
Author(s):  
Muhammad Saleem Awan ◽  
Laszlo Csurgai Horwath ◽  
Sajid Sheikh Muhammad ◽  
Erich Leitgeb ◽  
Farukh Nadeem ◽  
...  
Keyword(s):  
Free Space ◽  
Free Space Optical ◽  
Optical Propagation
Sign in / Sign up

Export Citation Format

Share Document