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检索条件"任意字段=3rd SPIE Conference on Laser System Modeling: Modeling and Simulation of Laser Systems III"

共 37 条记录，以下是11-20 订阅

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Statistical Characteristics of Free Space Optical systems Employing Reception Spatial Diversity 3

Statistical Characteristics of Free Space Optical Systems Em...

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3rd Annual conference on laser Communication and Propagation through the Atmosphere and Oceans

作者： de Oliveira, Jose Paulo G. Univ Pernambuco Ecomp FITec Fundacao Inovacoes Tecnol Recife PE Brazil

ISBN: (纸本)9781628412512

Free space optical communication has become an attractive solution for data transmission due to its cost-effective, license-free and high bandwidth characteristics. The performance of such systems, however, is highly affected by the effects of optical turbulence. Multiple laser transmitters and/or multiple aperture receivers can be used to mitigate the turbulence fading by exploiting the advantages of spatial diversity. In this work, the performance of a link employing spatial diversity at the receiver was investigated by analyzing two figures of merit: Bit Error Rate and Link Availability. The statistical properties of the photocurrent generated at the receiver - required for evaluating Bit Error Rate and Link Availability - were obtained by means of computer simulation using the Monte Carlo method. The results presented here can be very helpful in designing a free space optical link with spatial diversity, since they are given in function of system configurations and impairment conditions.

关键词： Free Space Optics spatial diversity stochastic simulation scintillation index optical turbulence bit error rate

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3D Geometric modeling and simulation of laser Propagation through Turbulence with Plenoptic Functions 3

3D Geometric Modeling and Simulation of Laser Propagation th...

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3rd Annual conference on laser Communication and Propagation through the Atmosphere and Oceans

作者： Wu, Chensheng Nelson, William Davis, Christopher C. Univ Maryland Dept Elect & Comp Engn College Pk MD 20742 USA

ISBN: (纸本)9781628412512

Plenoptic functions are functions that preserve all the necessary light field information of optical events. Theoretical work has demonstrated that geometric based plenoptic functions can serve equally well in the traditional wave propagation equation known as the "scalar stochastic Helmholtz equation". However, in addressing problems of 3D turbulence simulation, the dominant methods using phase screen models have limitations both in explaining the choice of parameters (on the transverse plane) in real-world measurements, and finding proper correlations between neighboring phase screens (the Markov assumption breaks down). Though possible corrections to phase screen models are still promising, the equivalent geometric approach based on plenoptic functions begins to show some advantages. In fact, in these geometric approaches, a continuous wave problem is reduced to discrete trajectories of rays. This allows for convenience in parallel computing and guarantees conservation of energy. Besides the pairwise independence of simulated rays, the assigned refractive index grids can be directly tested by temperature measurements with tiny thermoprobes combined with other parameters such as humidity level and wind speed. Furthermore, without loss of generality one can break the causal chain in phase screen models by defining regional refractive centers to allow rays that are less affected to propagate through directly. As a result, our work shows that the 3D geometric approach serves as an efficient and accurate method in assessing relevant turbulence problems with inputs of several environmental measurements and reasonable guesses (such as C-n(2) levels). This approach will facilitate analysis and possible corrections in lateral wave propagation problems, such as image de-blurring, prediction of laser propagation over long ranges, and improvement of free space optic communication systems. In this paper, the plenoptic function model and relevant parallel algorithm computing w

关键词： Atmospheric turbulence plenoptic function 3D geometric simulation phase screens turbulence estimations

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Massive MIMO-OFDM Indoor Visible Light Communication system Downlink Architecture Design 3

Massive MIMO-OFDM Indoor Visible Light Communication System ...

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3rd Annual conference on laser Communication and Propagation through the Atmosphere and Oceans

作者： Lang, Tian Li, Zening Chen, Gang Univ Calif Riverside Dept Elect Engn Riverside CA 92521 USA

ISBN: (纸本)9781628412512

Multiple-input multiple-output 9MIMO) technique is now used in most new broadband communication system, and orthogonal frequency division multiplexing 9OFDM) is also utilized within current 4th generation 94G) of mobile telecommunication technology. With MIMO and OFDM combined, visible light communication 9VLC) system's diversity gain is increase, yet system capacity for dispersive channels is also enhanced. Moreover, with the emerging massive MIMO-OFDM VLC system, there are significant advantages than smaller systems' such as channel hardening, further increasing of energy efficiency 9EE) and spectral efficiency 9SE) based on law of large number. This paper addresses one of the major technological challenges, system architecture design, which was solved by semispherical beehive structure 9SBS) receiver and so that diversity gain can be identified and applied in Massive MIMO VLC system. simulation results shows that the proposed design clearly presents a spatial diversity over conventional VLC systems.

关键词： Multiple-input multiple-output (MIMO) visible light communication (VLC) massive MIMO-OFDM VLC system energy efficiency (EE) spectral efficiency (SE) semispherical beehive structure (SBS) receiver

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Indoor Visible Light Communication: modeling and Analysis of Multi-state Modulation 3

Indoor Visible Light Communication: Modeling and Analysis of...

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3rd Annual conference on laser Communication and Propagation through the Atmosphere and Oceans

作者： Koudelka, Petr Latal, Jan Siska, Petr Vitasek, Jan Liner, Andrej Martinek, Radek Vasinek, Vladimir VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun 17 Listopadu 15-2172 Ostrava 70833 Czech Republic VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Cybernet & Biomed Engn Ostrava 70833 Czech Republic

ISBN: (纸本)9781628412512

The new dynamic direction of wireless networks development is based on the idea of networks utilizing the optical radiation in the visible spectrum VLC (Visible Light Communications). The impulse of this development direction was improvement in the semiconductor lighting technologies, namely the white power LEDs (Light Emitting Diode). These types of wireless networks are denoted as the optical wireless networks for indoor spaces utilizing optical radiation in the visible spectrum. The paper deals with the issue of deployment of multi-state modulations into the indoor visible light communications in LOS (Line of Sight) configuration. The first part of the paper focuses on design of modulation element (SMD LED matrix 3 x 3) and problems connected to deployment of multi-state modulation M-QAM (subcarrier intensity modulation) through this modulation element into the indoor visible light communications (MER). The second part deals with the irradiation distribution in dark room in comparison with real room during used multi-state modulation scheme in both simulation and real measurement.

关键词： visible light communication LED subcarrier intensity modulation multi-state modulation M-QAM line of sight

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Examining the validity of using a Gaussian Schell Model for modeling an extended beacon on a rough perfectly reflecting surface 3

Examining the validity of using a Gaussian Schell Model for ...

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3rd Annual conference on laser Communication and Propagation through the Atmosphere and Oceans

作者： Basu, Santasri Hyde, Milo W. McCrae, Jack E. Spencer, Mark F. Fiorino, Steven T. US Air Force Inst Technol Dept Engn Phys 2950 Hobson Way Wright Patterson AFB OH 45433 USA Oak Ridge Inst Sci & Educ Oak Ridge TN 37380 USA Air Force Inst Technol Dept Elect & Comp Engn Wright Patterson AFB OH 45433 USA

ISBN: (纸本)9781628412512

In military applications that use adaptive optics, an extended beacon instead of a point source beacon is created at the target due to atmospheric turbulence and other factors. These beacons, which have a finite spatial extent and exhibit varying degrees of coherence, are typically modeled in existing literature as a Gaussian Schell Model (GSM) due to its analytical tractability. Earlier, we used a full wave computational technique to evaluate the scattered field from a rough impedance surface in vacuum. The results showed some deviations from GSM behavior. The present work uses a simulation approach based on Physical Optics (PO) approximation to study the scattering behavior in presence of atmospheric turbulence. A fully coherent Gaussian beam is propagated through atmospheric phase screens to the rough surface target plane. The PO current is computed on the rough surface and the scattered field right above the surface is determined. The scattered light is propagated through a second set of atmospheric phase screens and thus the double passage through the atmosphere is realized. The rough surface is simulated using statistical parameters derived from profilometer measurements of standard targets. Through multiple realizations of the atmosphere and the rough surface, the statistics of the scattered field is determined. The simulations are done with different strengths of turbulence and different roughness scales of the target. The results are compared with a GSM. An effects model where the rough surface is modeled as a phase screen has also been implemented in order to verify the nature of the speckle returns.

关键词： Extended beacons Gaussian Schell Model rough surface scattering Physical Optics Turbulence

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Countering MANPADS: Study of new concepts and applications (2)

Countering MANPADS: Study of new concepts and applications (...

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conference on Optics and Photonics in Global Homeland Security iii

作者： Maltese, Dominique Vergnolle, Jean-Francois Aragones, Julien Renaudat, Mathieu SAGEM Def & Secur 180 Rue F-91344 Paris France

ISBN: (纸本)9780819466624

The latest events of ground-to-air Man Portable Air Defense (MANPAD) attacks against aircraft have revealed a new threat both for military and civilian aircraft. Consequently, the implementation of protecting systems (i.e. Directed Infra Red Counter Measure - DIRCM) in order to face IR guided missiles turns out to be now inevitable. In a near future, aircraft will have to possess detection, tracking, identification, targeting and jamming capabilities to face MANPAD threats. Besides, Multiple Missiles attacks become more and more current scenarios to deal with. In this paper, a practical example of DIRCM systems under study at SAGEM DEFENSE & SECURITY Company is presented. The article is the continuation of a previous spie one (see. [3]). Self-protection solutions include built-in and automatic locking-on, tracking, identification and laser jamming capabilities, including defeat assessment. Target Designations are provided by a Missile Warning system. Targets scenarios including multiple threats are considered to design systems architectures. In a first step, the article, reminds the context, current and future threats (IR seekers of different generations...), and scenarios for system definition. Then, it focuses on potential self-protection systems under study at SAGEM DEFENSE & SECURITY Company. Different strategies including target identification, multi band laser and active imagery have been previously studied in order to design DIRCM system solutions. Thus, results of self-protection scenarios are provided for different MANPAD scenarios to highlight key problems to solve. Data have been obtained from simulation software modeling full DIRCM systems architectures on technical and operational scenarios (parametric studies).

关键词： Fast steering turret capabilities laser jamming MANPAD Multiple threat scenarios Threat identification

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Advancements in integrated structural/thermal/optical (STOP) analysis of optical systems - art. no. 66750D

Advancements in integrated structural/thermal/optical (STOP)...

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conference on Optical Modelling and Performance Predictions iii

作者： Stoeckel, Gerhard Crompton, David Perron, Gera. rd L 3 Commun SSG Tinsley Wilmington MA 01887 USA

ISBN: (纸本)9780819468239

Applications involving optical systems with a variety of transient loading conditions in conjunction with tight optical error budgets require new tools to assess system performance accurately and quickly. For example, an optical telescope in geostationary orbit (e.g.: laser communications or weather satellite) may be required to maintain excellent optical performance with sun intermittently crossing near, or even within the telescope's field of view. To optimize the design, the designer would wish to analyze a large number of time steps through the orbit without sacrificing accuracy of the results. Historically, shortcuts have been taken to make the analysis effort manageable: contributing errors are combined in a root-sum-squared fashion;non-linear optical sensitivities to optical motions are made linear;and the surface deformation of non-circular optics and/or footprints are fit with zernike polynomials. L-3 SSG-Tinsley presents a method that eliminates these errors while allowing very fast processing of many cases. The method uses a software application that interfaces with both structural and optical analysis codes, and achieves raytrace-generated results from the optical model. This technique is shown to provide more accurate results than previous methods, as well as provide critical insights into the performance of the system that may be exploited in the design process. Results from the Advanced Baseline Imager ABI telescope are presented as an example.

关键词： Error analysis Mirrors Telescopes Code v Motion models Thermography Received signal strength Temperature metrology Zernike polynomials Thermal modeling

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laserCAD iii-web-oriented software tool for distance learning in study of semiconductor structure properties

LaserCAD III-web-oriented software tool for distance learnin...

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IEEE/LEOS International conference on Numerical simulation of Semiconductor Optoelectronic Devices

作者： A.V. Shulika I.M. Safonov P.S. Ivanov I.A. Sukhoivanov V.V. Lysak Kharkov National University of Radio Electronics 14 Lenin av. Kharkov Ukraine

In this work the interactive environment for distance education for studying the physical basics of semiconductor lasers is presented. Education resource that is part of the interactive environment (IEDE) for distance education corresponds to the first level of the model of Semantic Web markup languages and is a complex of static XML-documents. The original method for building up of IEDE is proposed. The method is founded on integration of static XML-documents and novel simulator laserCAD iii by means JSP. The created IEDE utilizes the proposed method and gives possibilities of practical interactive physics of semiconductor QW lasers. The use of IEDE allows to wide understanding of the working principles and peculiarities of practical utilizing of QW lasers and organize the system of distance education in optoelectronics.

关键词： Semiconductor lasers Software tools Computer aided instruction Mathematical model laser theory Application software laser modes Computational modeling Physics computing Java

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Compact high-repetition rate femtosecond laser-driven hard-x-ray source

Compact high-repetition rate femtosecond laser-driven hard-x...

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3rd conference on Advances in Laboratory-Based X-Ray Sources and Optics

作者： Egbert, A Mader, B Chichkov, BN Girardeau-Montaut, JP Laser Zentrum Hannover EV D-30419 Hannover Germany

ISBN: (纸本)0819445487

A compact, high-repetition rate, ultrashort-pulse laser-driven hard-x-ray source based on the combination of a femtosecond laser system with an x-ray diode is demonstrated. A comparison with available laser-plasma hard-x-ray sources is presented. Hard-x-ray fluxes exceeding 10(10) photons/s (emitted in 4pi) are realized at a repetition rate of 250 kHz. Numerical modeling is performed which proves that picosecond and sub-picosecond hard-x-ray pulses can be produced with this source.

关键词： ultrashort hard-x-rays x-ray diode femtosecond laser photocathodes

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Numerical testbed for laser materials processing

Numerical testbed for laser materials processing

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3rd conference on Gas and Chemical lasers Intense Beam Applications

作者： Gross, MS Black, I Müller, WH Heriot Watt Univ Dept Mech & Chem Engn Edinburgh EH14 4AS Midlothian Scotland

ISBN: (纸本)0819443700

Current numerical simulations of laser materials processing usually simplify any process model to a great extent in order to allow for short computation times. This significantly decreases their flexibility and ability to simulate the great variation of today's processes with their subtle but important differences. The simulation presented in this paper can be said to be truly three dimensional as opposed to other reported work that uses symmetric boundary conditions. This enables the investigators to simulate real laser beams. In contrast to the (well-documented) Marangoni flow profile, the authors will show results that do riot use the usual simplifying assumptions of flat surfaces. Preliminary output from the simulation deals with the transient coupled velocity and pressure profile and temperature distribution and hence the heat affected zone (HAZ). From this, conclusions can be drawn with regard to improving process efficiency, especially in laser cutting. It will be shown that the traditional perception of equating higher processing speeds with better processing efficiency does not hold in all cases. In fact, the opposite may well hold true. However, to demonstrate this the actual process of producing a part needs to be fully understood. A process may influence the workpiece material properties beneficially when it is performed at reduced speeds (material hardening or softening). The investigators contend that numerical modeling of the above can only be achieved credibly rising high performance computing methods.

关键词： laser materials processing laser sources numerical simulation numerical modeling fluid flow Marangoni free surfaces

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