This document summarizes a technical seminar on free space optics (FSO) presented by Kartik K Benageri at Jain Institute of Technology in Davangere, Karnataka, India. The seminar covered the introduction, key features, working principles, advantages, limitations, and conclusions of FSO technology. FSO uses lasers and photo detectors to transmit data, voice, or video at speeds up to 2.5 Gbps in a line-of-sight fashion without the need for fiber. While offering benefits like flexibility, low cost, and security compared to fiber or microwave, FSO performance can be impacted by environmental factors like fog, rain, scattering, and building sway. The seminar provided information
Free Space Optics (FSO) communications, also called Free Space Photonics (FSP) or Optical Wireless, refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere to obtain optical communications. Like fiber, Free Space Optics (FSO) uses lasers to transmit data, but instead of enclosing the data stream in a glass fiber, it is transmitted through the air. Free Space Optics (FSO) works on the same basic principle as Infrared television remote controls, wireless keyboards
Free Space Optics (FSO) communications, also called Free Space Photonics (FSP) or Optical Wireless, refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere to obtain optical communications. Like fiber, Free Space Optics (FSO) uses lasers to transmit data, but instead of enclosing the data stream in a glass fiber, it is transmitted through the air. Free Space Optics (FSO) works on the same basic principle as Infrared television remote controls, wireless keyboards
Free-space optical communication is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. It is a technology that can be installed license-free worldwide and can be installed in less than a day. A technology that offers a fast, high ROI. There is no Frequency License Required in it.
Free-space optical communication is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. It is a technology that can be installed license-free worldwide and can be installed in less than a day. A technology that offers a fast, high ROI. There is no Frequency License Required in it.
In this presentation, Stirling Dynamics discusses the uses and benefits of active controls for aerospace applications. The presentation covers the background of active controls, their current use and Stirling’s view on how active controls could be used in the future to enhance the flight simulation experience and to improve aircraft safety. Stirling has been at the forefront of the active controls since the early 1990s and is well positioned to lead the discussion on the future potential of the technology.
Wdm based fso link optimizing for 180 km using bessel filtereSAT Journals
Abstract Free space optical link is a growing field in communication due to its advantage of wide bandwidth, high security and easy installation. A wavelength division multiplexing (WDM) access network using free space optical (FSO) communication in different weather conditions like haze and rain are discussed in this article and find out the possibility of communication link up to 180 km in clear weather with 2.5 Gbps data rate on the wavelength of 1550 nm and up to 54 km in haze condition using same data rate & wave length. Further the effect of using two different low pass filter (Gaussian and Bessel) at the receiver are discussed and conclude that Bessel filter is better on 2.5 Gbps data rate for WDM based FSO link. Keywords: optical communications, wavelength Division Multiplexing (WDM), free space optics (FSO)
FSO networks under turbulence - Northumbria University 2013 Research ConferenceJoaquin Perez
FSO networks: understanding route diversity under turbulence phenomena towards reliable FSO mesh networks design.
In last mile extensions of MANs, wireless mesh networks are multi-hop networks being used as backbone networks connecting end-users with the access points connected to the Internet. Wireless mesh networks are an attractive option over optical fibres because of their ease of installation and cost effectiveness of deployment[1]. Moreover, Free Space Optics (FSO) technology is an attractive option for use in mesh networks [2, 3]. However, time-variant influence of the atmosphere in FSO links that introduces one of the main drawbacks [4]. In order to overcome the turbulence induced fading in FSO systems, several techniques have been proposed These include: spatial transmitter/receiver diversity [5] [6]; adaptive beam forming [7]; wavelength diversity [8], multiple-beam communication [9], novel modulation techniques and hybrid RF/optical link scheme. Moreover, topology design and routing are essential tools for FSO mesh networks performance. The turbulence phenomena also influences in the topology and routing design of complex FSO networks, then route diversity techniques will improve the mesh network reliability [14]. For example, route diversity application within mesh optical networks deployed Tokyo provided interesting experiment results in [15]. This presentation will offer an overview of turbulence phenomena on FSO mesh networks from route diversity point of view.
References
[1] I. F. Akyildiz, X. Wang, and W. Wang, "Wireless mesh networks: a survey," Computer Networks, vol. 47, pp. 445-487, 2005.
[2] Z. Hu, P. Verma, and J. J. Sluss, "Improved reliability of free-space optical mesh networks through topology design," J. Opt. Netw., vol. 7, pp. 436-448, 2008.
[3] A. Kashyap, K. Lee, M. Kalantari, S. Khuller, and M. Shayman, "Integrated topology control and routing in wireless optical mesh networks," Computer Networks, vol. 51, pp. 4237-4251, 2007.
[4] Z. Ghassemlooy, W. Popoola, and S. Rajbhandari, Optical Wireless Communications : System and Channel Modelling with MATLAB: CRC Press 2012.
[5] S. M. Navidpour, M. Uysal, and M. Kavehrad, "BER performance of free-space optical transmission with spatial diversity," IEEE Trans. Wireless Commun., vol. 6, pp. 2813-2819, Aug 2007.
[6] H. Moradi, H. H. Refai, and P. G. LoPresti, "Switch-and-stay and switch-and-examine dual diversity for high-speed free-space optics links," IET Optoelectron, vol. 6, pp. 34-42, 2012.
[7] R. K. Tyson, "Bit-error rate for free-space adaptive optics laser communications," J. Opt. Soc. Am. A:, vol. 19, pp. 753-758, Apr 2002.
[8] V. Weerackody and A. R. Hammons, "Wavelength Correlation in Free Space Optical Communication Systems," in Proceedings of IEEE Military Communications Conference 2006, 2006, pp. pp. 1-6.
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Free Space Optics (FSO), also known as Optical Wireless Communication or Laser Communication, is a communication technology that employs beams of light to transmit data through the air or free space. Unlike traditional wired or radio-frequency-based communication methods, FSO relies on the transmission of modulated laser or infrared beams to establish high-speed data links between two points without the need for physical cables.
COMPARISON OF DIFFERENT TRANSMITTERS USING 1550NM AND 10000NM IN FSO COMMUNIC...ijcsit
In the recent past Free Space Optical (FSO) communication has taken over the radio frequency
communication and microwave systems due to its advantages like its long-range operations devoid of need
of license. In this paper we will find the most efficient transmitter suitable for free space optical (FSO)
communication. The theoretical analysis of behaviour of an FSO wireless communications system is done
using on off keying with different transmitters over fog weather conditions. Based on different models for
optical beam propagation at 1550nm and 10000nm on an FSO, the bit error rate (BER) and Q-factor under
fog weather are analyzed.
Free space optics known as (FSO) is very popular now days this is because of increased demand for cheaper, faster and most important affordable internet. So many research scientists have taken the great interest in this field. FSO uses laser for transmitting data at the speed capable of reaching 2.5 Gbps through the air. And its systems use invisible infrared laser light wavelengths in the 780 nm to 1600 nm range. This article explains the FSO security, the transmission characteristics and also its challenges; although Free Space Optic systems can be a better solution for the needs of some broadband networking, there are limitations of bad climatic conditions that influence its performance such as fog, snow and too much rain can shut down the network. The performance of FSO is measured by Bit Error Rates (BER).
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Loss Calculation in Free Space Optical CommunicationsIJERA Editor
Free space optical (FSO) system is an alternative approach to replace the general optical
communication in many applications .In this system signal is propagating through the air as a transmission
medium. At present FSO system are capable of handling the data up to 2.5 Gbps. It supports audio, video and
data through air as a transmission media. This will use optical carrier in the infrared and visible regions to
establish the links. In this paper we calculated different losses in the system and specified various advanced
methods for the future FSO. It also finds in many applications such as Military, Metro network extension,
Telecommunication networking and Last-mile access.
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1. VISVESVARAYA TECHNOLOGICAL UNIVERSITY
BELGAUM, KARNATAKA.
A Technical Seminar on
FREE SPACE OPTICS
By:-
Kartik K Benageri
ARKA Educational and Cultural Trust(R)
Jain Institute of Technology, Davangere
Department Of Electronics and Communication Engineering
2. Supervised by:
Prof. Magdy Ibrahim
Prepared by:
Ahmed Ashraf Abdel-Haseb
Ahmed-Houssam Mahmoud
Ahmed Magdy El-Sayed
Amr Atef Hussein
Mohamed Khaled Abo-Seif
3. • Introduction
• Key Features
• Working of FSO
• Advantages of FSO
• Limitations of FSO
• Conclusion
• References
• Acknowledgment
4. FSO is a line-of-sight technology which uses LASERS and
Photo detectors to provide optical connections between
two points-without the fibre.
FSO can transmit data, voice or video at speeds capable of
reaching 2.5 Gbps.
An FSO unit consists of an optical transceiver with a
laser transmitter and a receiver to provide full duplex (bi-
directional) capability.
FSO systems use invisible infrared laser light wavelengths in
the 750nm to 1550nm range
4
5. This mode of communication was first used in the 8th century by
the Greeks.They used fire as the light source ,the atmosphere as
the transmission medium and human eye as receiver.
Optical wireless communication was used by Alexander Graham
Bell in the late 19th century even before his telephone.
Bell FSO experiment converted voice sounds to telephone signals
and transmitted them between receivers through free air space
along a beam of light for a distance of some 600 feet, this was later
called PHOTOPHONE
6. AT TRANSMITTER
Electrical signal is converted to optical energy using
LED or Laser diodes and is transmitted through air.
AT RECIEVER
a. Optical concentrator
b. Optical Filter
c. Photo detector
6
10. 10
1 Network traffic
converted into
pulses of
invisible light
representing 1’s
and 0’s
2 Transmitter projects the
carefully aimed light pulses
into the air
5 Reverse direction data
transported the same way.
• Full duplex
3 A receiver at the other end of
the link collects the light using
lenses and/or mirrors
4 Received signal
converted back into
fiber or copper and
connected to the
network
Anything that can be done in fiber
can be done with FSO
11. DRIVER
CIRCUI
T
SIGNAL
PROCESSING
PHOTO
DETECTOR
Link Range L
FSO LINK EQUATION
Cloud
Rain
Smoke
Gases
Temperature variations
Fog and aerosol
Transmission of optical radiation through the atmosphere obeys the Beer-
Lamberts’s law:
α : Attenuation coefficient dB/km – Not controllable and is roughly independent of
wavelength in heavy attenuation conditions.
d1 and d2:Transmit and receive aperture diameters (m)
D: Beam divergence (mrad)(1/e for Gaussian beams; FWHA for flat top beams),
This equation fundamentally ties FSO to the atmospheric weather conditions
Range
RangeDiv
A
PP
receiver
tr .exp.
)( 2
11
12. Serial to parallel converter(Independent data streams ).
Parallel encoder.
Parity generator(Parity check bits).
Modulation(OOK or PPM).
At the modulator these code sequences modulate each diode with
a different wavelength and are multiplexed. In the multiplexer each
optical signal from channels is focused on an optical fiber.
TransmitOptics
Size
Power
Beam quality
13. Receive Optics
Aperture size
f-number
Demodulator
The multiplexed signals are de-multiplexed with their carrier
wavelength. The optical filter is used as the de-multiplexer.
Photo diode array.
Demodulator (pulse demodulator).
Parity checker.
Parallel decoder
Parallel data blocks are parallel to serial converted to retrieve
the original data.
14. Free space optics offers a flexible networking solution that
delivers on the promise of broadband
No licensing required like RF.
Deployment of FSO systems quickly and easily.
Security
Immunity from electromagnetic interference
Lower costs as compared to fiber networks.
High Speed data upto 2.5Gbps
15. As tahe medium is air and the light pass through it,
some environmental challenges are inevitable.
1. FOG : Fog substantially attenuates visible radiation,
and it has a similar affect on the near-infrared
wavelengths that are employed in FSO systems.
Fog can be countered by a network design with short
FSO link distances. FSO installation in foggy cities
like san Francisco have successfully achieved
carrier-class reliability.
16. 2. PHYSICAL OBSTRUCTIONS: Flying birds can
temporarily block a single beam, but this tends to cause only
short interruptions and transmissions are easily and
automatically re-assumed.
3. SCINTILLATION: Scintillation refers the variations in light
intensity caused by atmospheric turbulence. Such turbulence
may be caused by wind and temperature gradients which
results in air pockets of varying diversity act as prisms or lenses
with time varying properties.
17. 4. SCATTERING: In scattering there is no loss of energy, only
a directional redistribution of energy which may cause reduction
in beam intensity for longer distance.
5. SOLAR INTERFERENCE
6. ABSORPTION
7. BUILDING SWAY / SEISMIC ACTIVITY
18. Secure and undetectable FSO system can
connect large areas safely with minimal planning
and deployment time.
19. 2. Wireless Service Provider
Unlike microwave or fiber, deployment of FSO
does not require spectrum licensing, physical
disruption to a location, or government zoning
approvals. Carriers are free to grow their
business.
20. 3. Enterprise connectivity
Companies, airports, hospitals and schools
can use safe, secure Free space optical
wireless links to connect buildings within their
campus environments.
22. Criteria FSO Optical Fiber Microwave
Data rate Up to 10 Gbps 100 Mbps to 100 Gbps 275 Mbps
Installation Easy Difficult Moderate
Cost Moderate High Moderate
Maintenance low High low
Most common
uses
Between buildings
Short distance
Point-to point
Long distance
Point-to-point
Short distance
Advantages Price
performance
No license
Security
capacity and speed
Immunity to EMI
speed
Disadvantages Can be intercepted Difficult to splice
determinate
Can be intercepted
Requires radio license
Security Moderate Excellent Poor 22
23. Clear, still air -1 dB/km -5 dB/km
Scintillation 0 to -3 dB/km
Birds or foliage Impenetrable 0 to -20 dB
Window (double-glazed) -3 dB -1 dB
Light mist (visibility 400m) -25 dB/km -1 dB/km
Medium fog (visibility 100m) -120 dB/km -1 dB/km
Thick fog (visibility 40m) -300 dB/km -1 dB/km
Light rain (25mm/hour) -10 dB/km -10 dB/km
Heavy rain (150mm/hour) -25 dB/km -40 dB/km
23
24. REFRENCES
[1] S.V. Kartalopoulos , “ Disaster Avoidance in
the Manhattan Fiber Distributed
Data Interface Network , ” Globecom ’ 93,
Houston, TX, December 2, 1993 .
[2] Scott Bloom, “The Physics of Free Space
Optics”, AirFiber, Inc.
[3] “Free-Space Optical Communications on
HAPs”, www.hapcos.org , accessed on : 13-
May-2012
25. We thank our Seminar Guide Prof. Halesh.M.R. for
his valuable guidance and directions in making the
seminar resourceful.
I extend my sense of gratitude to Dr.Nagaraja B.G.
HOD, Department of E&CE, JIT, Davangere for
extending support and cooperation which helped
me in completion of the seminar.
25
Editor's Notes
Unfortunately, the received power is exponentially dependent on the product of the atmospheric attenuation coefficient and the range; in real atmospheric situations, for applications with required availabilities of 99.9% or higher, this term overwhelms everything else in the equation.