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free space optics systems
(39 results)-
White Papers
Modulation and Directionality Characteristics of Free-Space Optical Transmission Links
Jan 2009
Transmission characteristics of free-space optical (FSO) data transmission systems are characterized. Issues of optical directionality, being related to the optical modulation depth, are...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
What Is Free Space Optics (FSO)?
Feb 2009
This white paper is intended to provide valuable background and resource information on FSO technology. Whether one is a student, an engineer, account manager, partner, or customer, this paper...
Provided by LightPointe
-
White Papers
Free-Space Optics Based Wireless Sensor Network Design
Jul 2008
This paper proposes an FSO-based mobile sensor network that is not subject to RF interference common to wireless sensor networks. FSO-based mobile sensor networks can potentially be used in a...
Provided by University of Oklahoma
-
White Papers
Adaptive Modulation and Coding for Free-Space Optical Channels
May 2010
Adaptive modulation and coding can provide robust and spectrally efficient transmission over terrestrial free-space optical channels. Three adaptive modulation schemes are considered in this...
Provided by Optical Society of America
-
White Papers
Coded PPM and Multipulse PPM and Iterative Detection for Free-Space Optical Links
Oct 2009
Signal modulation has an important impact on the system performance in optical communication. Two attractive modulation schemes are Pulse Position Modulation (PPM) and Multi Pulse PPM (MPPM),...
Provided by Optical Society of America
-
White Papers
Requirements and Challenges for Tactical Free-Space Lasercomm
Jun 2008
Mobile free-space Laser communications is the next frontier for net-centric connectivity, as bandwidth, spectrum and security issues drive its adoption as an adjunct to RF communications. However,...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Free-Space Optics Technology Improves Situational Awareness on the Battlefield
Sep 2007
Free-Space Optics (FSO), or optical wireless, is an unlicensed line-of-sight technology that uses modulated optical sources to transmit information through the air. By using light beams, FSO can...
Provided by SPIE
-
White Papers
Subsea Ultraviolet Solar-Blind Broadband Free-Space Optics Communication
Apr 2009
This paper examines the potential of subsea free-space optics FSO for sensor network applications leveraging the emerging technologies of highly sensitive photon-counting detectors and...
Provided by SPIE
-
White Papers
Modulating Retroreflector Implementation of MIL-STD- 1553 Protocol With Free-Space Optics
Oct 2007
A Modulating Retro Reflector (MRR) is used for1 a Free-Space Optics (FSO) implementation of the MILSTD- 1553 protocol. A Multiple Quantum Well (MQW) pi-n structure is used for a single device that...
Provided by NASA
-
White Papers
Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors
Jul 2007
This paper investigates the performance and design of Free-Space Optical (FSO) communication links over slow fading channels from an information theory perspective. A statistical model for the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
BER and Outage Probability of DPSK Subcarrier Intensity Modulated Free Space Optics in Fully Developed Speckle
Jun 2009
In this paper Differential Phase Shift Keying (DPSK) subcarrier intensity modulated (SIM) Free Space Optical (FSO) link is considered in negative exponential atmospheric turbulence environment. To...
Provided by Academy Publisher
-
White Papers
Multi-Objective Optimization Techniques in Topology Control of Free Space Optical Networks
May 2008
To mitigate the effects of obscuration and attenuation, Free Space Optical (FSO) wireless networks employ topology control to dynamically reconfigure node connectivity based on changes in link...
Provided by University of Maryland
-
White Papers
Satellite Free Space Optics Test Generator
Apr 2009
Free Space Optics (FSO) is relatively a new type of communication. Laser beam as a data carrier is propagated from a source to a target without any extra transmission medium. The transmission...
Provided by Brno University of Technology
-
White Papers
Performance Bounds for Free-Space Optical MIMO Systems With APD Receivers in Atmospheric Turbulence
Oct 2007
Performance bounds of Free Space Optical (FSO) systems with multiple laser transmitters and multiple Avalanche PhotoDetectors (APDs) are evaluated for terrestrial, line-of-sight communication....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems
Oct 2009
Atmospheric turbulence can cause significant performance degradation in free-space optical communication systems. It is well known that the effect of turbulence can be reduced by performing...
Provided by Optical Society of America
-
White Papers
Coupling of Plasmon Waveguide Modes to Freespace Optics Through Surface Sculpting of Ultrathin Freestanding Films
Nov 2008
A method for coupling between nanomembrane-based optical waveguides utilizing long-range surface plasmon polaritons and propagating free-space modes is described and analyzed. Authors base the...
Provided by Technical University of Vienna
-
White Papers
Optical Wireless Links With Spatial Diversity Over Strong Atmospheric Turbulence Channels
Feb 2009
Optical wireless, also known as free-space optics, has received much attention in recent years as a cost-effective, licensefree and wide-bandwidth access technique for high data rates...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Study of Fog Characteristics Using Free-Space Optical Wireless Links
Jun 2010
A technique for modeling the fog droplet size distributions using modified gamma distribution has been demonstrated by considering two separate radiation fog events recorded in Graz (Austria) and...
Provided by Graz University of Technology
-
White Papers
Electronic Wavefront Correction for PSK Free-Space Optical Communications
Sep 2007
Atmospheric turbulence distorts the wavefront of the signal in Free-Space Optical Communications (FSOC), which results in amplitude and phase error at the detector. To mitigate this problem,...
Provided by University of Central Florida
-
White Papers
High Speed Electronics for Free Space Optical Communication Between Spacecraft
Apr 2008
This paper mainly covers the electronic design, manufacturing and testing of an FSO (Free Space Optics) communication system intended for a data transfer speed of at least 1 Gbit/s. The system is...
Provided by Uppsala University
-
White Papers
Free Space Optical Connectivity for Last Mile Solution in Bangladesh
Jan 2010
Bangladesh has just joined the SEA-ME-WE-4 submarine cable network consortium. The 10 Gbs bandwidth of this network is expected to serve Bangladesh's needs. Bangladesh having a submarine...
Provided by BRAC University
-
White Papers
Performance Optimization of Free-Space Optical Communication Protocols Based on Results From FSO Demonstrations
Sep 2007
The mobile free-space optical channel mainly suffers from relatively long link outages, produced by short-term blockings of the line-of-sight (obstacles, clouds), pointing- and tracking-errors or...
Provided by SPIE
-
White Papers
Performance Analysis of Free - Space Optical Systems in Gamma - Gamma Fading
Mar 2008
Atmospheric turbulence induced fading is one of the main impairments affecting Free - Space Optics (FSO). In recent years, Gamma - Gamma fading has become the dominant fading model for FSO links...
Provided by University of British Columbia
-
White Papers
A new Quality of Service FSO software
Sep 2007
Free space Optical links (FSO) in visible and infrared wavelengths constitute an interesting alternative to new transmission channels for cordless phone, data-processing networks and high...
Provided by Universite de Bourgogne
-
White Papers
Free-Space Optical Modules for Interconnecting 2D-Photonic VLSI Circuitry Over Inter-Chip Distances
Jan 2010
In this paper authors present different configurations for a compact Free-Space Optical Interconnection (FSOI) module by combining two radial Gradient Refractive Index lenses (GRIN) and/or two...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Integrated Polymer Microprisms for Free Space Optical Beam Deflecting
Feb 2009
Authors demonstrate beam deflection and multiple channel communication in free space optical communications using microprisms integrated directly onto an array of Vertical Cavity Surface Emitting...
Provided by Optical Society of America
-
White Papers
Outage Probability of the MIMO Gaussian Free-Space Optical Channel with PPM
May 2008
The main drawback in communicating via the freespace optical channel is the detrimental effect the atmosphere has on a propagating laser beam. Atmospheric turbulence causes random fluctuations in...
Provided by University of South Australia
-
White Papers
Serial Free-Space Optical Relaying Communications Over Gamma-Gamma Atmospheric Turbulence Channels
Jun 2010
In this paper, a study on the end-to-end performance of multi-hop free-space optical wireless systems over turbulence induced fading channels, modeled by the gamma-gamma distribution, is...
Provided by University of Athens
-
White Papers
Packaging of Dual-Mode Wireless Communication Module Using RF/Optoelectronic Devices With Shared Functional Components
May 2010
This paper reports the design, fabrication, and testing of a compact Radio-Frequency (RF)/ Free Space Optical (FSO) dual mode wireless communication system. A modified split dual-director...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A PSAM-Based Estimator of Noise and Fading Statistics for Optimum Receivers of Free Space Optics Signals
Oct 2010
Incoherent receivers of Free Space Optical (FSO) signals have no knowledge of instantaneous channel state. Thus, the receiver requires some information about the noise and fading statistics for a...
Provided by SPIE
-
White Papers
Experimental Demonstration/Analysis of Fiber-Bundlebased Receiver Performance
Aug 2009
In order to track, acquire and maintain a free-space optical link between mobile platforms experiencing misalignment due to movement and atmospheric turbulence requires a different approach than...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Business Prospects of Wide-Scale Deployment of Free Space Optical Technology as a Last-Mile Solution: A Techno-Economic Evaluation
Jun 2007
A technoeconomic evaluation of the business prospects of a wide-scale deployment of Free Space Optical (FSO) technology as a last-mile solution is carried out. The evaluation is based on a...
Provided by Optical Society of America
-
White Papers
Efficiency of MIMO Configuration and Adaptive Optics Corrections in Free Space Optical Fading Channels
Dec 2009
Free Space Optical (FSO) communications is the only practical candidate for realizing universal network coverage between ground and airborne nodes, satellites, and even moon and other nearby...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Free Space Optical Channel Characterization and Modeling With Focus on Algeria Weather Conditions
Apr 2012
Free-Space Optics (FSO) is a wireless optical technology that enables optical transmission of data, voice and video communications through the air, up to 10 Gbps of data, based on the use of the...
Provided by mecs-press
-
Whitepapers
A Cross-Layer Approach to Mitigate Fading on Bidirectional Free Space Optical Communication Links
Oct 2008
In Free-Space Optical (FSO) communications the transmitted signal is subject to different fading effects. These effects can cause short-term outages of a few milliseconds, caused by atmospheric...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
DTN-Based Free-Space Optical and Directional RF Networks
Oct 2008
With the growth in demand for capacity from users in wireless networks and the scarcity of available RF spectrum, directional networks are expected to provide effective solutions. Directional RF...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Topology Formation for Tactical Networks With Directional RF and Free-Space Optical Links
Sep 2008
This paper addresses the graph theoretical underpinning of forming a topology during the deployment of directional RF or Free Space Optical (FSO) based tactical networks. The objective is to...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Dual Amplitude-Width PPM for Free Space Optical Systems
Apr 2012
The PPM (Pulse Position Modulation) is commonly used in Free Space Optic (FSO) systems owing to its power efficiency, but it shows a rapid decline in spectral efficiency with increase in the power...
Provided by mecs-press
-
Whitepapers
Signaling Technique for Free Space Optics on the Basis of Bit Error Rate
Jun 2012
A new efficient method to implement Orthogonal Frequency Division Multiplexing (OFDM) on Intensity Modulated Direct Detection (IM/DD) channels is presented and termed auto-correlated optical OFDM....
Provided by International Journal of Advanced Research in Computer Engineering & Technology
-
Whitepapers
Signaling Technique for Free Space Optics on the Basis of Bit Error Rate
Jun 2012
A new efficient method to implement Orthogonal Frequency Division Multiplexing (OFDM) on Intensity Modulated Direct Detection (IM/DD) channels is presented and termed auto-correlated optical OFDM....
Provided by International Journal of Advanced Research in Computer Engineering & Technology
-
Whitepapers
Dual Amplitude-Width PPM for Free Space Optical Systems
Apr 2012
The PPM (Pulse Position Modulation) is commonly used in Free Space Optic (FSO) systems owing to its power efficiency, but it shows a rapid decline in spectral efficiency with increase in the power...
Provided by mecs-press
-
Whitepapers
Topology Formation for Tactical Networks With Directional RF and Free-Space Optical Links
Sep 2008
This paper addresses the graph theoretical underpinning of forming a topology during the deployment of directional RF or Free Space Optical (FSO) based tactical networks. The objective is to...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
DTN-Based Free-Space Optical and Directional RF Networks
Oct 2008
With the growth in demand for capacity from users in wireless networks and the scarcity of available RF spectrum, directional networks are expected to provide effective solutions. Directional RF...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
A Cross-Layer Approach to Mitigate Fading on Bidirectional Free Space Optical Communication Links
Oct 2008
In Free-Space Optical (FSO) communications the transmitted signal is subject to different fading effects. These effects can cause short-term outages of a few milliseconds, caused by atmospheric...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Free Space Optical Channel Characterization and Modeling With Focus on Algeria Weather Conditions
Apr 2012
Free-Space Optics (FSO) is a wireless optical technology that enables optical transmission of data, voice and video communications through the air, up to 10 Gbps of data, based on the use of the...
Provided by mecs-press
-
White Papers
Efficiency of MIMO Configuration and Adaptive Optics Corrections in Free Space Optical Fading Channels
Dec 2009
Free Space Optical (FSO) communications is the only practical candidate for realizing universal network coverage between ground and airborne nodes, satellites, and even moon and other nearby...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Business Prospects of Wide-Scale Deployment of Free Space Optical Technology as a Last-Mile Solution: A Techno-Economic Evaluation
Jun 2007
A technoeconomic evaluation of the business prospects of a wide-scale deployment of Free Space Optical (FSO) technology as a last-mile solution is carried out. The evaluation is based on a...
Provided by Optical Society of America
-
White Papers
Experimental Demonstration/Analysis of Fiber-Bundlebased Receiver Performance
Aug 2009
In order to track, acquire and maintain a free-space optical link between mobile platforms experiencing misalignment due to movement and atmospheric turbulence requires a different approach than...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A PSAM-Based Estimator of Noise and Fading Statistics for Optimum Receivers of Free Space Optics Signals
Oct 2010
Incoherent receivers of Free Space Optical (FSO) signals have no knowledge of instantaneous channel state. Thus, the receiver requires some information about the noise and fading statistics for a...
Provided by SPIE
-
White Papers
Packaging of Dual-Mode Wireless Communication Module Using RF/Optoelectronic Devices With Shared Functional Components
May 2010
This paper reports the design, fabrication, and testing of a compact Radio-Frequency (RF)/ Free Space Optical (FSO) dual mode wireless communication system. A modified split dual-director...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Serial Free-Space Optical Relaying Communications Over Gamma-Gamma Atmospheric Turbulence Channels
Jun 2010
In this paper, a study on the end-to-end performance of multi-hop free-space optical wireless systems over turbulence induced fading channels, modeled by the gamma-gamma distribution, is...
Provided by University of Athens
-
White Papers
Outage Probability of the MIMO Gaussian Free-Space Optical Channel with PPM
May 2008
The main drawback in communicating via the freespace optical channel is the detrimental effect the atmosphere has on a propagating laser beam. Atmospheric turbulence causes random fluctuations in...
Provided by University of South Australia
-
White Papers
Integrated Polymer Microprisms for Free Space Optical Beam Deflecting
Feb 2009
Authors demonstrate beam deflection and multiple channel communication in free space optical communications using microprisms integrated directly onto an array of Vertical Cavity Surface Emitting...
Provided by Optical Society of America
-
White Papers
Free-Space Optical Modules for Interconnecting 2D-Photonic VLSI Circuitry Over Inter-Chip Distances
Jan 2010
In this paper authors present different configurations for a compact Free-Space Optical Interconnection (FSOI) module by combining two radial Gradient Refractive Index lenses (GRIN) and/or two...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A new Quality of Service FSO software
Sep 2007
Free space Optical links (FSO) in visible and infrared wavelengths constitute an interesting alternative to new transmission channels for cordless phone, data-processing networks and high...
Provided by Universite de Bourgogne
-
White Papers
Performance Analysis of Free - Space Optical Systems in Gamma - Gamma Fading
Mar 2008
Atmospheric turbulence induced fading is one of the main impairments affecting Free - Space Optics (FSO). In recent years, Gamma - Gamma fading has become the dominant fading model for FSO links...
Provided by University of British Columbia
-
White Papers
Performance Optimization of Free-Space Optical Communication Protocols Based on Results From FSO Demonstrations
Sep 2007
The mobile free-space optical channel mainly suffers from relatively long link outages, produced by short-term blockings of the line-of-sight (obstacles, clouds), pointing- and tracking-errors or...
Provided by SPIE
-
White Papers
Free Space Optical Connectivity for Last Mile Solution in Bangladesh
Jan 2010
Bangladesh has just joined the SEA-ME-WE-4 submarine cable network consortium. The 10 Gbs bandwidth of this network is expected to serve Bangladesh's needs. Bangladesh having a submarine...
Provided by BRAC University
-
White Papers
High Speed Electronics for Free Space Optical Communication Between Spacecraft
Apr 2008
This paper mainly covers the electronic design, manufacturing and testing of an FSO (Free Space Optics) communication system intended for a data transfer speed of at least 1 Gbit/s. The system is...
Provided by Uppsala University
-
White Papers
Electronic Wavefront Correction for PSK Free-Space Optical Communications
Sep 2007
Atmospheric turbulence distorts the wavefront of the signal in Free-Space Optical Communications (FSOC), which results in amplitude and phase error at the detector. To mitigate this problem,...
Provided by University of Central Florida
-
White Papers
A Study of Fog Characteristics Using Free-Space Optical Wireless Links
Jun 2010
A technique for modeling the fog droplet size distributions using modified gamma distribution has been demonstrated by considering two separate radiation fog events recorded in Graz (Austria) and...
Provided by Graz University of Technology
-
White Papers
Optical Wireless Links With Spatial Diversity Over Strong Atmospheric Turbulence Channels
Feb 2009
Optical wireless, also known as free-space optics, has received much attention in recent years as a cost-effective, licensefree and wide-bandwidth access technique for high data rates...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Coupling of Plasmon Waveguide Modes to Freespace Optics Through Surface Sculpting of Ultrathin Freestanding Films
Nov 2008
A method for coupling between nanomembrane-based optical waveguides utilizing long-range surface plasmon polaritons and propagating free-space modes is described and analyzed. Authors base the...
Provided by Technical University of Vienna
-
White Papers
Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems
Oct 2009
Atmospheric turbulence can cause significant performance degradation in free-space optical communication systems. It is well known that the effect of turbulence can be reduced by performing...
Provided by Optical Society of America
-
White Papers
Performance Bounds for Free-Space Optical MIMO Systems With APD Receivers in Atmospheric Turbulence
Oct 2007
Performance bounds of Free Space Optical (FSO) systems with multiple laser transmitters and multiple Avalanche PhotoDetectors (APDs) are evaluated for terrestrial, line-of-sight communication....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Satellite Free Space Optics Test Generator
Apr 2009
Free Space Optics (FSO) is relatively a new type of communication. Laser beam as a data carrier is propagated from a source to a target without any extra transmission medium. The transmission...
Provided by Brno University of Technology
-
White Papers
Multi-Objective Optimization Techniques in Topology Control of Free Space Optical Networks
May 2008
To mitigate the effects of obscuration and attenuation, Free Space Optical (FSO) wireless networks employ topology control to dynamically reconfigure node connectivity based on changes in link...
Provided by University of Maryland
-
White Papers
BER and Outage Probability of DPSK Subcarrier Intensity Modulated Free Space Optics in Fully Developed Speckle
Jun 2009
In this paper Differential Phase Shift Keying (DPSK) subcarrier intensity modulated (SIM) Free Space Optical (FSO) link is considered in negative exponential atmospheric turbulence environment. To...
Provided by Academy Publisher
-
White Papers
Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors
Jul 2007
This paper investigates the performance and design of Free-Space Optical (FSO) communication links over slow fading channels from an information theory perspective. A statistical model for the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Modulating Retroreflector Implementation of MIL-STD- 1553 Protocol With Free-Space Optics
Oct 2007
A Modulating Retro Reflector (MRR) is used for1 a Free-Space Optics (FSO) implementation of the MILSTD- 1553 protocol. A Multiple Quantum Well (MQW) pi-n structure is used for a single device that...
Provided by NASA
-
White Papers
Subsea Ultraviolet Solar-Blind Broadband Free-Space Optics Communication
Apr 2009
This paper examines the potential of subsea free-space optics FSO for sensor network applications leveraging the emerging technologies of highly sensitive photon-counting detectors and...
Provided by SPIE
-
White Papers
Free-Space Optics Technology Improves Situational Awareness on the Battlefield
Sep 2007
Free-Space Optics (FSO), or optical wireless, is an unlicensed line-of-sight technology that uses modulated optical sources to transmit information through the air. By using light beams, FSO can...
Provided by SPIE
-
White Papers
Requirements and Challenges for Tactical Free-Space Lasercomm
Jun 2008
Mobile free-space Laser communications is the next frontier for net-centric connectivity, as bandwidth, spectrum and security issues drive its adoption as an adjunct to RF communications. However,...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Coded PPM and Multipulse PPM and Iterative Detection for Free-Space Optical Links
Oct 2009
Signal modulation has an important impact on the system performance in optical communication. Two attractive modulation schemes are Pulse Position Modulation (PPM) and Multi Pulse PPM (MPPM),...
Provided by Optical Society of America
-
White Papers
Adaptive Modulation and Coding for Free-Space Optical Channels
May 2010
Adaptive modulation and coding can provide robust and spectrally efficient transmission over terrestrial free-space optical channels. Three adaptive modulation schemes are considered in this...
Provided by Optical Society of America
-
White Papers
Free-Space Optics Based Wireless Sensor Network Design
Jul 2008
This paper proposes an FSO-based mobile sensor network that is not subject to RF interference common to wireless sensor networks. FSO-based mobile sensor networks can potentially be used in a...
Provided by University of Oklahoma
-
White Papers
What Is Free Space Optics (FSO)?
Feb 2009
This white paper is intended to provide valuable background and resource information on FSO technology. Whether one is a student, an engineer, account manager, partner, or customer, this paper...
Provided by LightPointe
-
White Papers
Modulation and Directionality Characteristics of Free-Space Optical Transmission Links
Jan 2009
Transmission characteristics of free-space optical (FSO) data transmission systems are characterized. Issues of optical directionality, being related to the optical modulation depth, are...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Modulation and Directionality Characteristics of Free-Space Optical Transmission Links
Jan 2009
Transmission characteristics of free-space optical (FSO) data transmission systems are characterized. Issues of optical directionality, being related to the optical modulation depth, are...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
What Is Free Space Optics (FSO)?
Feb 2009
This white paper is intended to provide valuable background and resource information on FSO technology. Whether one is a student, an engineer, account manager, partner, or customer, this paper...
Provided by LightPointe
-
White Papers
Free-Space Optics Based Wireless Sensor Network Design
Jul 2008
This paper proposes an FSO-based mobile sensor network that is not subject to RF interference common to wireless sensor networks. FSO-based mobile sensor networks can potentially be used in a...
Provided by University of Oklahoma
-
White Papers
Adaptive Modulation and Coding for Free-Space Optical Channels
May 2010
Adaptive modulation and coding can provide robust and spectrally efficient transmission over terrestrial free-space optical channels. Three adaptive modulation schemes are considered in this...
Provided by Optical Society of America
-
White Papers
Coded PPM and Multipulse PPM and Iterative Detection for Free-Space Optical Links
Oct 2009
Signal modulation has an important impact on the system performance in optical communication. Two attractive modulation schemes are Pulse Position Modulation (PPM) and Multi Pulse PPM (MPPM),...
Provided by Optical Society of America
-
White Papers
Requirements and Challenges for Tactical Free-Space Lasercomm
Jun 2008
Mobile free-space Laser communications is the next frontier for net-centric connectivity, as bandwidth, spectrum and security issues drive its adoption as an adjunct to RF communications. However,...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Free-Space Optics Technology Improves Situational Awareness on the Battlefield
Sep 2007
Free-Space Optics (FSO), or optical wireless, is an unlicensed line-of-sight technology that uses modulated optical sources to transmit information through the air. By using light beams, FSO can...
Provided by SPIE
-
White Papers
Subsea Ultraviolet Solar-Blind Broadband Free-Space Optics Communication
Apr 2009
This paper examines the potential of subsea free-space optics FSO for sensor network applications leveraging the emerging technologies of highly sensitive photon-counting detectors and...
Provided by SPIE
-
White Papers
Modulating Retroreflector Implementation of MIL-STD- 1553 Protocol With Free-Space Optics
Oct 2007
A Modulating Retro Reflector (MRR) is used for1 a Free-Space Optics (FSO) implementation of the MILSTD- 1553 protocol. A Multiple Quantum Well (MQW) pi-n structure is used for a single device that...
Provided by NASA
-
White Papers
Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors
Jul 2007
This paper investigates the performance and design of Free-Space Optical (FSO) communication links over slow fading channels from an information theory perspective. A statistical model for the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
BER and Outage Probability of DPSK Subcarrier Intensity Modulated Free Space Optics in Fully Developed Speckle
Jun 2009
In this paper Differential Phase Shift Keying (DPSK) subcarrier intensity modulated (SIM) Free Space Optical (FSO) link is considered in negative exponential atmospheric turbulence environment. To...
Provided by Academy Publisher
-
White Papers
Multi-Objective Optimization Techniques in Topology Control of Free Space Optical Networks
May 2008
To mitigate the effects of obscuration and attenuation, Free Space Optical (FSO) wireless networks employ topology control to dynamically reconfigure node connectivity based on changes in link...
Provided by University of Maryland
-
White Papers
Satellite Free Space Optics Test Generator
Apr 2009
Free Space Optics (FSO) is relatively a new type of communication. Laser beam as a data carrier is propagated from a source to a target without any extra transmission medium. The transmission...
Provided by Brno University of Technology
-
White Papers
Performance Bounds for Free-Space Optical MIMO Systems With APD Receivers in Atmospheric Turbulence
Oct 2007
Performance bounds of Free Space Optical (FSO) systems with multiple laser transmitters and multiple Avalanche PhotoDetectors (APDs) are evaluated for terrestrial, line-of-sight communication....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems
Oct 2009
Atmospheric turbulence can cause significant performance degradation in free-space optical communication systems. It is well known that the effect of turbulence can be reduced by performing...
Provided by Optical Society of America
-
White Papers
Coupling of Plasmon Waveguide Modes to Freespace Optics Through Surface Sculpting of Ultrathin Freestanding Films
Nov 2008
A method for coupling between nanomembrane-based optical waveguides utilizing long-range surface plasmon polaritons and propagating free-space modes is described and analyzed. Authors base the...
Provided by Technical University of Vienna
-
White Papers
Optical Wireless Links With Spatial Diversity Over Strong Atmospheric Turbulence Channels
Feb 2009
Optical wireless, also known as free-space optics, has received much attention in recent years as a cost-effective, licensefree and wide-bandwidth access technique for high data rates...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Study of Fog Characteristics Using Free-Space Optical Wireless Links
Jun 2010
A technique for modeling the fog droplet size distributions using modified gamma distribution has been demonstrated by considering two separate radiation fog events recorded in Graz (Austria) and...
Provided by Graz University of Technology
-
White Papers
Electronic Wavefront Correction for PSK Free-Space Optical Communications
Sep 2007
Atmospheric turbulence distorts the wavefront of the signal in Free-Space Optical Communications (FSOC), which results in amplitude and phase error at the detector. To mitigate this problem,...
Provided by University of Central Florida
-
White Papers
High Speed Electronics for Free Space Optical Communication Between Spacecraft
Apr 2008
This paper mainly covers the electronic design, manufacturing and testing of an FSO (Free Space Optics) communication system intended for a data transfer speed of at least 1 Gbit/s. The system is...
Provided by Uppsala University
-
White Papers
Free Space Optical Connectivity for Last Mile Solution in Bangladesh
Jan 2010
Bangladesh has just joined the SEA-ME-WE-4 submarine cable network consortium. The 10 Gbs bandwidth of this network is expected to serve Bangladesh's needs. Bangladesh having a submarine...
Provided by BRAC University
-
White Papers
Performance Optimization of Free-Space Optical Communication Protocols Based on Results From FSO Demonstrations
Sep 2007
The mobile free-space optical channel mainly suffers from relatively long link outages, produced by short-term blockings of the line-of-sight (obstacles, clouds), pointing- and tracking-errors or...
Provided by SPIE
-
White Papers
Performance Analysis of Free - Space Optical Systems in Gamma - Gamma Fading
Mar 2008
Atmospheric turbulence induced fading is one of the main impairments affecting Free - Space Optics (FSO). In recent years, Gamma - Gamma fading has become the dominant fading model for FSO links...
Provided by University of British Columbia
-
White Papers
A new Quality of Service FSO software
Sep 2007
Free space Optical links (FSO) in visible and infrared wavelengths constitute an interesting alternative to new transmission channels for cordless phone, data-processing networks and high...
Provided by Universite de Bourgogne
-
White Papers
Free-Space Optical Modules for Interconnecting 2D-Photonic VLSI Circuitry Over Inter-Chip Distances
Jan 2010
In this paper authors present different configurations for a compact Free-Space Optical Interconnection (FSOI) module by combining two radial Gradient Refractive Index lenses (GRIN) and/or two...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Integrated Polymer Microprisms for Free Space Optical Beam Deflecting
Feb 2009
Authors demonstrate beam deflection and multiple channel communication in free space optical communications using microprisms integrated directly onto an array of Vertical Cavity Surface Emitting...
Provided by Optical Society of America
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White Papers
Outage Probability of the MIMO Gaussian Free-Space Optical Channel with PPM
May 2008
The main drawback in communicating via the freespace optical channel is the detrimental effect the atmosphere has on a propagating laser beam. Atmospheric turbulence causes random fluctuations in...
Provided by University of South Australia
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White Papers
Serial Free-Space Optical Relaying Communications Over Gamma-Gamma Atmospheric Turbulence Channels
Jun 2010
In this paper, a study on the end-to-end performance of multi-hop free-space optical wireless systems over turbulence induced fading channels, modeled by the gamma-gamma distribution, is...
Provided by University of Athens
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White Papers
Packaging of Dual-Mode Wireless Communication Module Using RF/Optoelectronic Devices With Shared Functional Components
May 2010
This paper reports the design, fabrication, and testing of a compact Radio-Frequency (RF)/ Free Space Optical (FSO) dual mode wireless communication system. A modified split dual-director...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A PSAM-Based Estimator of Noise and Fading Statistics for Optimum Receivers of Free Space Optics Signals
Oct 2010
Incoherent receivers of Free Space Optical (FSO) signals have no knowledge of instantaneous channel state. Thus, the receiver requires some information about the noise and fading statistics for a...
Provided by SPIE
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White Papers
Experimental Demonstration/Analysis of Fiber-Bundlebased Receiver Performance
Aug 2009
In order to track, acquire and maintain a free-space optical link between mobile platforms experiencing misalignment due to movement and atmospheric turbulence requires a different approach than...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Business Prospects of Wide-Scale Deployment of Free Space Optical Technology as a Last-Mile Solution: A Techno-Economic Evaluation
Jun 2007
A technoeconomic evaluation of the business prospects of a wide-scale deployment of Free Space Optical (FSO) technology as a last-mile solution is carried out. The evaluation is based on a...
Provided by Optical Society of America
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White Papers
Efficiency of MIMO Configuration and Adaptive Optics Corrections in Free Space Optical Fading Channels
Dec 2009
Free Space Optical (FSO) communications is the only practical candidate for realizing universal network coverage between ground and airborne nodes, satellites, and even moon and other nearby...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Free Space Optical Channel Characterization and Modeling With Focus on Algeria Weather Conditions
Apr 2012
Free-Space Optics (FSO) is a wireless optical technology that enables optical transmission of data, voice and video communications through the air, up to 10 Gbps of data, based on the use of the...
Provided by mecs-press
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Whitepapers
A Cross-Layer Approach to Mitigate Fading on Bidirectional Free Space Optical Communication Links
Oct 2008
In Free-Space Optical (FSO) communications the transmitted signal is subject to different fading effects. These effects can cause short-term outages of a few milliseconds, caused by atmospheric...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
DTN-Based Free-Space Optical and Directional RF Networks
Oct 2008
With the growth in demand for capacity from users in wireless networks and the scarcity of available RF spectrum, directional networks are expected to provide effective solutions. Directional RF...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Topology Formation for Tactical Networks With Directional RF and Free-Space Optical Links
Sep 2008
This paper addresses the graph theoretical underpinning of forming a topology during the deployment of directional RF or Free Space Optical (FSO) based tactical networks. The objective is to...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Dual Amplitude-Width PPM for Free Space Optical Systems
Apr 2012
The PPM (Pulse Position Modulation) is commonly used in Free Space Optic (FSO) systems owing to its power efficiency, but it shows a rapid decline in spectral efficiency with increase in the power...
Provided by mecs-press
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Whitepapers
Signaling Technique for Free Space Optics on the Basis of Bit Error Rate
Jun 2012
A new efficient method to implement Orthogonal Frequency Division Multiplexing (OFDM) on Intensity Modulated Direct Detection (IM/DD) channels is presented and termed auto-correlated optical OFDM....
Provided by International Journal of Advanced Research in Computer Engineering & Technology
