Bibliografie tematiche / Ultra wide band optical systems

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Letteratura scientifica selezionata sul tema "Ultra wide band optical systems"

Autore: Grafiati

Pubblicato: 5 ottobre 2024

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Articoli di riviste sul tema "Ultra wide band optical systems"

Yousef, Basma M., Allam M. Ameen, Bassant H. El Swiefy e Reham Arnous. "A Compact Ultra-wide Band Antenna with a Notched Band for Wireless Communication Systems". Progress In Electromagnetics Research Letters 108 (2023): 31–39. http://dx.doi.org/10.2528/pierl22101503.

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Masuda, Hiroji. "Wide-band and low-noise optical amplification technologies in ultra-high capacity optical communication systems". Review of Laser Engineering 36, Supplement (2008): 184–85. http://dx.doi.org/10.2184/lsj.36.184.

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Tan, Mingqi. "Design of L+Band Bismuth-doped Fiber Laser". Highlights in Science, Engineering and Technology 97 (28 maggio 2024): 147–51. http://dx.doi.org/10.54097/yypbq622.

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At present, the development of new communication bands to meet the needs of large communication transmission capacity in the current era is one of the key research topics. The conventional erbium-doped laser is limited by its structure which has the problem of short luminous bandwidth and can not cover a large communication band. Therefore, there is growing interest in designing bismuth-doped glass and fiber with ultra-wide gain bandwidth for fiber laser applications. By utilizing its ultra-wide gain bandwidth characteristics, important communication devices such as broadband fiber amplifiers and broadband tunable fiber lasers can be designed to operate in the L+band, thereby solving the problem that the ultra-wide bandwidth of the optical communication window cannot be achieved in the future high-speed communication systems. In this study, the 1550nm pump source is used to excite the bismuth-doped fiber, and the MATLAB numerical simulation modeling is used to design a bismuth-doped fiber laser with a central wavelength of 1650nm and a threshold power of 10W. To a certain extent, this design addresses the research gap in L+ band bismuth-doped fiber lasers.

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Koshelev, V. I., V. T. Sarychev e S. E. Shipilov. "Estimation of the impulse response of ultra-wide-band systems". Radiophysics and Quantum Electronics 41, n. 9 (settembre 1998): 805–12. http://dx.doi.org/10.1007/bf02677635.

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Okamoto, Seiji, Kyo Minoguchi, Fukutaro Hamaoka, Kengo Horikoshi, Asuka Matsushita, Masanori Nakamura, Etsushi Yamazaki e Yoshiaki Kisaka. "A Study on the Effect of Ultra-Wide Band WDM on Optical Transmission Systems". Journal of Lightwave Technology 38, n. 5 (1 marzo 2020): 1061–70. http://dx.doi.org/10.1109/jlt.2019.2962178.

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Lu, Yong, Shaohe Lv e Xiaodong Wang. "Adaptive Sub-Nyquist Spectrum Sensing for Ultra-Wideband Communication Systems". Symmetry 11, n. 3 (7 marzo 2019): 342. http://dx.doi.org/10.3390/sym11030342.

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With the ever-increasing demand for high-speed wireless data transmission, ultra-wideband spectrum sensing is critical to support the cognitive communication over an ultra-wide frequency band for ultra-wideband communication systems. However, it is challenging for the analog-to-digital converter design to fulfill the Nyquist rate for an ultra-wideband frequency band. Therefore, we explore the spectrum sensing mechanism based on the sub-Nyquist sampling and conduct extensive experiments to investigate the influence of sampling rate, bandwidth resolution and the signal-to-noise ratio on the accuracy of sub-Nyquist spectrum sensing. Afterward, an adaptive policy is proposed to determine the optimal sampling rate, and bandwidth resolution when the spectrum occupation or the strength of the existing signals is changed. The performance of the policy is verified by simulations.

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Deshours, Frédérique, Anne-Laure Billabert, Catherine Algani, Fabrice Blache, Christian Rumelhard e Georges Alquié. "A 40 Gbps electro-absorption modulator integrated laser modeling method for optical transmitter in ultra-wide band radio-over-fiber systems". International Journal of Microwave and Wireless Technologies 1, n. 6 (dicembre 2009): 511–19. http://dx.doi.org/10.1017/s1759078709990791.

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The great interest of optical fiber links in communicating systems especially in ultra-wide band (UWB) communications has grown up in the last decade and requires co-simulation for mixed circuits design exploiting both optical and microwave domains. In this paper, we report an original modeling method of an electro-absorption modulator associated with a distributed-feedback laser to simulate an optical transmitter of an UWB over fiber system. Large signal optoelectronic device models can be developed and implemented in a high-frequency simulator, such as advanced design system-Ptolemy to analyze the performances of fiber radio links and study the impact of the transmitter characteristics. This specific simulation way, taking into account precisely electrical characteristics of both electrical and optical circuits, links two different frequency domains by coupling electrical and optical modules in the same system simulator. Therefore, a complete simulation of an UWB multi-band orthogonal frequency division multiplexing signal transmission over fiber with an external modulator is investigated.

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Barde, Rajesh, Kailash Nemade e Sandeep Waghuley. "Complex Optical Investigation of Sodium Superoxide Loaded Phosphovanadate Glass System in Ultra-Violet and Visible Region". Trends in Sciences 19, n. 23 (10 novembre 2022): 2077. http://dx.doi.org/10.48048/tis.2022.2077.

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Sodium superoxide loaded phosphovanadate based glass systems were prepared from a mixture of vanadium pentoxide (V2O5), phosphorus pentoxide (P2O5) boric acid (H3BO3) and sodium superoxide (NaO2) using a melt-quenching method. Amorphous phase of as-prepared glass system confirmed using XRD technique. Surface morphology of glass system studied using scanning electron microscope. Ultraviolet-visible spectroscopy was employed to extract complex optical parameters like direct and indirect optical band gap, Urbach energy, refractive index, complex dielectric constant and optical conductivity. The absorption bands in the region 200 - 400 nm are recognized to the ligand-to-metal charge transfer. The region of 400 - 600 nm is ascribed to the pair excitation processes. The refractive index increases initially and then decreases for 15 and 20 mol % of NaO2 due non bridging oxygen (NBO) atoms. The 25 mol % of NaO2 sample shows maximum value of extinction coefficient and refractive index. The direct and indirect band gap energies vary in between 2.067 to 1.824 eV and 1.869 to 1.495 eV, respectively. With increase in concentration of NaO2, the effective band gap of NaO2 decreases because band edge shifted into forbidden gap due to increase in defect levels below the conduction. This primary report on sodium superoxide loaded phosphovanadate based glass systems opens wide avenue for battery and supercapacitor applications. Tailing in the bandgap was observed and found to obey Urbach rule. HIGHLIGHTS Sodium superoxide-phosphovanadate glass system prepared by melt-quenching method Complex optical properties of prepared glass system studied successfully Glass system have characteristics of trapping of light Also, glass system has ability to slow down light GRAPHICAL ABSTRACT

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Fornaser, Alberto, Luca Maule, Alessandro Luchetti, Paolo Bosetti e Mariolino De Cecco. "Self-Weighted Multilateration for Indoor Positioning Systems". Sensors 19, n. 4 (20 febbraio 2019): 872. http://dx.doi.org/10.3390/s19040872.

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The paper proposes an improved method for calculating the position of a movable tag whose distance to a (redundant) set of fixed beacons is measured by some suitable physical principle (typically ultra wide band or ultrasound propagation). The method is based on the multilateration technique, where the contribution of each individual beacon is weighed on the basis of a recurring, self-supported calibration of the measurement repeatability of each beacon at a given distance range. The work outlines the method and its implementation, and shows the improvement in measurement quality with respect to the results of a commercial Ultra-Wide-Band (UWB) system when tested on the same set of raw beacon-to-tag distances. Two versions of the algorithm are proposed: one-dimensional, or isotropic, and 3D. With respect to the standard approach, the isotropic solution managed to reduce the maximum localization error by around 25%, with a maximum error of 0.60 m, while the 3D version manages to improve even further the localization accuracy, with a maximum error of 0.45 m.

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Wang, Yong, Biaogang Xu, Dengguo Zhang, Shixiang Xu, Zheng Dong, Xuanke Zeng, Xiaowei Lu e Jihong Pei. "Magneto-Optical Isolator Based on Ultra-Wideband Photonic Crystals Waveguide for 5G Communication System". Crystals 9, n. 11 (30 ottobre 2019): 570. http://dx.doi.org/10.3390/cryst9110570.

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This paper presents a novel magneto-optical isolator based on an ultra-wideband and high efficiency photonic crystals (PCs) waveguide and gyromagnetic ferrites. The three-dimensional numerical simulation finds that the photonic crystals waveguide’s (PCW) transmission efficiency rises with its height and width. The corresponding experiments are performed by using a triangular lattice Al2O3 dielectric posts array in 5G millimeter wave band. The measured transmission efficiency is up to 90.78% for the optimal PCs waveguide structure, which has ultra-wide operating bandwidth from 23.45 to 31.25 GHz. The magneto-optical isolator is designed by inserting two rectangular gyromagnetic ferrites into the PCs waveguide. Due to the contrast between the effective permeability of the left and right circular polarization waves passing through the magnetized ferrite sheets, the ferromagnetic resonance absorption of the forward and reverse waves is different. By using finite element method, the isolation is optimized to be 49.49 dB for the isolator and its relative bandwidth reaches 8.85%. The high isolation, broadband, and easy integration indicate that our designed magneto-optical isolator has significant advantage in 5G communication systems.

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Tesi sul tema "Ultra wide band optical systems"

Escobar, landero Salma. "Ultra-wideband coherent optical transmission systems : from modeling and optimization to experimental demonstrations beyond 100 Tbit/s". Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAS012.

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Les systèmes ultra-large bande(UWB) sont considérés comme une stratégie rentable pour augmenter le débit par fibre dans les communications optiques en repoussant les limites de la bande passante opérationnelle au-delà de la bande C. Des expériences récente sont présenté des résultats prometteurs avec des transmissions à haute capacité UWB fonctionnant à travers les bandes S+C+L, et même au-delà. Ces avancées soulèvent la question des avoir si cette technologie peut être efficacement mise à l'échelle pour répondre aux demandes croissantes de trafic de données. Cette thèse fournit une étude approfondie sur les opportunités et les défis des systèmes UWB. À travers l'analyse de modèles qui tiennent compte des dégradations dépendant de la longueur d'onde, le cœur de cette thèse consiste en le développement et la validation de techniques d'optimisation de puissance basées sur ces modèles, conçues pour améliorer la performance des systèmes UWB. L'étude réalisée comprend des évaluations numériques et expérimentales des systèmes S+C+L. De plus, la précision des prédictions obtenues dans cette étude offre des aperçus précieux sur la qualité de transmission, parmi lesquels une analyse des implications associées à d'éventuelles défaillances du système UWB. Enfin, cette thèse envisage une vision pour l'avenir de cette technologie, discutant de la faisabilité de l'adoption des systèmes UWB par rapport au déploiement de systèmes parallèles en fibre
Ultra-wideband systems (UWB)are considered a cost-effective strategy to boostthe per-fiber through put in optical communications by pushing the boundaries of operational bandwidth beyond the conventional C-band. Recent experiments have showcased promising results with UWB high-capacity transmissions operating across the S+C+L bands, and evenfurther. These advancements raise the question of whether this technology can be effectively used to meet the growing demands for data traffic.This thesis provides an extensive investigation in to the opportunities and challenges ofUWB systems. Through the analysis of models that address the challenging wavelength dependent impairments, the core of this thesis consists in the development and validation of model-based power optimization techniques designed to enhance UWB system performance. The investigation is performed in numerical and experimental assessments in S+C+L systems. Moreover, the accurate model-based predictions obtained in this study offer invaluable insightsinto the transmission quality. These include ananalysis of the implications associated with potential UWB system failures. Finally, this thesis casts a vision for the future of this technology,discussing the feasibility of adopting UWBsystems over the deployment of parallel fibersystems

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Guidi, Francesco. "Study of Ultra Wide Band Modulated Backscattering Based RFID Systems". Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/pastel-00848627.

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Depuis quelques années le nouveau paradigme d'internet des objets, qui se traduit par la connexion des objets de la vie quotidienne à internet grâce à des dispositifs électroniques intégrés, est devenu plus qu'un simple concept et a commencé à entrer dans la réalité. Il en est ainsi des systèmes d'identification par radiofréquence (RFID), qui font partie des technologies disponibles. Lorsque le coût et la taille des tags deviennent des exigences prépondérantes, l'adoption de tags (semi-)passifs fondés sur la modulation d'un signal rétrodiffusé représente une solution attractive. En outre, l'utilisation de techniques ULB apporte des avantages propres à favoriser le remplacement d'une partie des systèmes RFID actuels qui souffrent de certains défauts tels qu'une trop forte consommation ou une faible robustesse en présence d'interférence. La thèse de doctorat se place dans ce contexte: elle a pour objectif l'étude des systèmes ULB RFID semi-passifs et se situe dans le cadre du projet européen SELECT, qui vise à développer et à évaluer un tel système. La prise de conscience qu'il était fondamental de comprendre les mécanismes électromagnétiques intrinsèques à la communication lecteur-tag, préalablement à la conception du système, s'est traduite par la mise en oeuvre d'une collaboration franco-italienne dans le cadre d'une cotutelle de thèse. C'est donc au départ autour d'une analyse fine et d'une modélisation des aspects antennaires et du canal radio entre le lecteur et le tag que la 1re partie du travail s'est construite. La 2nde partie a exploité ces travaux pour l'élaboration des schémas de modulation et de codage du lecteur et du tag pour les systèmes semi-passifs
In the recent years, the idea of the Internet of Things, that is a pervasive presence of electronics devices embedded in every-day objects, is facing a rapid adoption and will create a new era in the Internet scenario. Among all the technologies, radio frequency identification (RFID) seems one of the most promising. In addition, when tag cost, size and power consumption become stringent requirements, (semi-) passive solutions based on the modulation of the backscatter signal represent a good choice. Thus, this work was developed with the intent to study UWB RFID systems based on the modulation of the backscattered signal considering different related issues. The European Project SELECT gave the motivation to investigate the combination of UWB and RFID technologies, which are expected together to overcome many limitations of current narrowband RFID devices. The consciousness that, before the design of proper system architectures for backscatter communication, it was fundamental to understand the basic EM mechanisms underlying the interaction between readers and tags, was reflected in a wide investigation ranging from EM characterization of backscatter links to the definition and design of signal structures and transmission schemes. This dual need motivated a joint french-italian agreement between two laboratories for the supervision of the thesis. In particular, in the course of the work carried out in France, the analysis of the tag backscattering has been analyzed in several ways, both in ideal and real conditions. The results and competences were then exploited in Italy, in order to study an architecture able to ensure a reliable communication between reader and tag

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Berksoy, Burak. "ULTRA-WIDE BAND IN COMMUNICATIONS: PERFORMANCE ANALYSIS AND ENHANCEMENTS". Doctoral diss., Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002106.

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Toycan, Mehmet. "Next generation optical access networks and wireless integration featuring ultra-wide-band technology". Thesis, University of Essex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510509.

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Jin, Ruofan. "Cognitive power allocation for multicarrier based ultra wide band (UWB) wireless systems". Thesis, University of York, 2012. http://etheses.whiterose.ac.uk/3306/.

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This thesis presents a study of Distributed Cognitive Power Allocation for multicarrier based Ultra Wide Band (UWB) wireless systems in a point to point configuration as a way of reducing the coexistence interference for low power emission wireless systems in close proximity, as well as combating the increased path loss and fading at longer range by means of a Distributed Cognitive Power Allocation (DCPA) scheme. The Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) standard for Ultra Wide Band (UWB) wireless data communication is used as the basis in this research. A novel gradient power allocation is developed for channel sharing and partitioning among multiple user with no direct information exchange. A novel game strategy is used to assist the gradient power allocation and guide the behaviour of the homogenous users in order to acquire their target data rate. We show the superiority of our game based approach in terms of convergence and power efficiency through the comparison between our Game based and iterative water-filling based approaches. The strength of our scheme is also gained from a theoretical proof of convergence (demonstrating of the existence of a Nash Equilibrium). Performance analysis is carried out for both frequency selective and frequency none selective channels. Also, performance is evaluated for both interference dominated and noise dominated environments, where the severe interference is caused by the homogenous systems deployed in close vicinity. It is shown that the achievable target date rate is largely constrained by the interference while the performance is not impaired by frequency selective channel in terms of convergence and convergent speed. The methodology is adapted for an extended range scenario, where the protection of the licensed user (Primary user) is taken into consideration as well as the target data rate requirement. A new performance measure called the Power Impact Factor is used to quantify the impact of the power allocation scheme compared with the FCC spectrum mask. This measure is used to quantify the interference generated by cognitive UWB devices in relation to the existing agile services.

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Fallah, Hamid Reza. "Aberration calculation and design methods for ultra wide-angle and panoramic optical systems". Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266272.

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Tauqeer, Tauseef. "Low Power, High Speed InP-Based Digital Intergrated Circuits for Ultra Wide Band Communicatiopn Systems". Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508526.

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Javashvili, Otar. "UWB Antennas for Wall Penetrating Radar Systems". Thesis, University of Gävle, University of Gävle, University of Gävle, Center for RF Measurement Technologies, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-5509.

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Basic properties and new design principles of ultra wideband Vivaldi antennas are presentedand discussed in this paper. The focus will be on the modeling of Vivaldi antenna design curves, by which it is constructed; its simulation results, realization and the measurements.

According to the aim of this research the discussion starts with the review of the previous researches done for Vivaldi antennas. Introductory part of the report also contains the problem description for the current project and the classification of the goals to be achieved. As a theoretical review, the discussion initiates with the definitions anddescription of basic parameters of the antennas and covers a short presentation of UWBpulse-based radar system. The attention will be focused on UWB signals behavior and characterization, their propagation principles and basic troubles stands nowadays. As anapplication the wall penetrating Radar systems will be considered. The major part of thereport holds on the investigation of the design principles of Vivaldi Antenna andoptimization of the key parameters for achieving the best performance for radar. Theending part of the report shows the simulations and measurement results and theircomparisons following with conclusions/discussions.

The report will be supportive for the antenna designers, who work for UWB systems andparticularly for Vivaldi antennas, as long as there are showing up detailed descriptions ofVivaldi antenna characteristics depending on its shape and substrate properties. The modelfor designing Vivaldi antennas, given in this project, can successfully be applied for almostall the cases used in practice nowadays.

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Al-baidhani, Abbas. "Self-deployable positioning systems for emergency situations employing uwb radio technology". Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667752.

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Indoor positioning systems have been widely studied in the last decade due to the need of humans for them especially in the large building such as malls, airports, hospitals...etc. Still, there is no suitable precise indoor positioning system which can be implemented for different indoor environments and situations. We should mention military urban and emergency situations. In military urban and emergency response operations, the time is a crucial issue, and a precise positioning system with a clear indoor covering is a highly prerequisite tool to enhance safety. It should be seamless, low, frugal, power efficacious, low cost and supply less meter-level accuracy. In emergency scenarios, we don't have enough flexibility and time to install all anchor nodes in a proper situation that may help to obtain an appropriate accuracy for locating a mobile station, but command centers require observing their operational forces, and rescuers demand to detect potential victims to perform proper care. The most common users for these situations are the firefighters, police, military, and civilians. The main goal of this Ph.D. dissertation is to create an accurate indoor positioning (IP) system that could be used in different indoor environments and situation, especially for the emergency situation. So, we create this system through different steps as explained below. First, we have considered the study of different radio technologies to choose the suitable radio technology called Ultra wide band (UWB) radio technology. The reasons of selection the UWB and the commercial device that implements such technology are explained in details in chapters 3 and 4. Afterward, due to some impacts of the UWB in indoor environments (see chapters 4 and 5), we continue the study of NLOS identification and mitigation methods. In these chapters, we create two different NLOS identification and mitigation methods using a commercial UWB device experimentally. The first method used two parameters extracted from the UWB device to identify the propagation channel and map information of the building that the method is experimentally done in it to mitigate the NLOS channel. The second method of NLOS identification and mitigation used three parameters extracting from the UWB device to be an input set of the Fuzzy logic technique used to identify the propagation channels. In this identification method, it is not only to identify the prorogation channel to NLOS and LOS but also to divide the NLOS channel into hard and soft channels. Then, we created a database that includes the three parameters and the distance Bias to mitigate the NLOS channel for obtaining an accurately estimated distance to be used for creating an accurate IP system. Finally, with the aim of applying our designs to mass market applications, we move to create a novel IP system using the UWB technology called anchor selection (AS). In this technique, we focus on using fewer sensors (anchor nodes) to locate a mobile station under harsh circumstances such as scenarios where the installation area of the anchor nodes is narrow and/or the installation time should be very short. The proposed approach is based on grouping anchor nodes in different sets and evaluating the positioning error of each of these groups by means of a novel mean squared error (MSE)-based methodology. A virtual node approach is also proposed to consider the case where position must be computed with only two anchor nodes.

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STOPPA, MATTEO, Candido PIRRI, DANILO DEMARCHI e Andrew David Green. "Smart Devices and Systems for Wearable Applications". Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2646656.

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Wearable technologies need a smooth and unobtrusive integration of electronics and smart materials into textiles. The integration of sensors, actuators and computing technologies able to sense, react and adapt to external stimuli, is the expression of a new generation of wearable devices. The vision of wearable computing describes a system made by embedded, low power and wireless electronics coupled with smart and reliable sensors - as an integrated part of textile structure or directly in contact with the human body. Therefore, such system must maintain its sensing capabilities under the demand of normal clothing or textile substrate, which can impose severe mechanical deformation to the underlying garment/substrate. The objective of this thesis is to introduce a novel technological contribution for the next generation of wearable devices adopting a multidisciplinary approach in which knowledge of circuit design with Ultra-Wide Band and Bluetooth Low Energy technology, realization of smart piezoresistive / piezocapacitive and electro-active material, electro-mechanical characterization, design of read-out circuits and system integration find a fundamental and necessary synergy. The context and the results presented in this thesis follow an “applications driven” method in terms of wearable technology. A proof of concept has been designed and developed for each addressed issue. The solutions proposed are aimed to demonstrate the integration of a touch/pressure sensor into a fabric for space debris detection (CApture DEorbiting Target project), the effectiveness of the Ultra-Wide Band technology as an ultra-low power data transmission option compared with well known Bluetooth (IR-UWB data transmission project) and to solve issues concerning human proximity estimation (IR-UWB Face-to-Face Interaction and Proximity Sensor), wearable actuator for medical applications (EAPtics project) and aerospace physiology countermeasure (Gravity Loading Countermeasure Skinsuit project).

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Più fonti

Libri sul tema "Ultra wide band optical systems"

International Workshop Networking with Ultra Wide Band--Workshop on Ultra Wide Band for Sensor Networks (2nd 2005 Rome, Italy). 2005 2nd International Workshop Networking with Ultra Wide Band Workshop on Ultra Wide Band for Sensor Networks: Rome, July 4-6, 2005. Piscataway, N.J: IEEE, 2005.

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Lang, Jack. Applications of Ultra Wide Band Wireless. Wiley & Sons, Incorporated, John, 2005.

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Lang, Jack. Applications of Ultra Wide Band Wireless. John Wiley & Sons, 2005.

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Kartalopoulos, Stamatios V. Free Space Optical Networks for Ultra-Broad Band Services. Wiley & Sons, Incorporated, John, 2011.

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Kartalopoulos, Stamatios V. Free Space Optical Networks for Ultra-Broad Band Services. Wiley & Sons, Incorporated, John, 2012.

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Kartalopoulos, Stamatios V. Free Space Optical Networks for Ultra-Broad Band Services. Wiley & Sons, Incorporated, John, 2011.

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Kartalopoulos, Stamatios V. Free Space Optical Networks for Ultra-Broad Band Services. Wiley & Sons, Incorporated, John, 2011.

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2005 2nd International Workshop Networking with Ultra Wide Band--Workshop on Ultra Wide Band for Sensor Networks, Rome, Italy, July 4-6, 2005. Institute of Electrical & Electronics Enginee, 2005.

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Biglieri, Ezio, Lorenzo Mucchi, Marco Hernández e Ryusai Miura. Body Area Networks Using IEEE 802.15.6: Implementing the Ultra Wide Band Physical Layer. Elsevier Science & Technology Books, 2014.

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Hernandez, Marco, Lorenzo Mucchi e Ryu Miura. Body Area Networks Using IEEE 802. 15. 6: Implementing the Ultra Wide Band Physical Layer. Elsevier Science & Technology Books, 2014.

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Capitoli di libri sul tema "Ultra wide band optical systems"

Héthuin, Serge, e Isabelle Bucaille. "Applications of Ultra Wide Band Systems". In Ultra Wide Band Antennas, 1–32. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118557754.ch1.

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Majidzadeh Bafar, Vahid, e Alexandre Schmid. "Digital Impulse Radio Ultra Wide-Band Transmitter". In Wireless Cortical Implantable Systems, 131–77. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6702-1_6.

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Pointon, Harry A. G., e Frederic A. Bezombes. "Mapping of Ultra-Wide Band Positional Variance for Indoor Environments". In Towards Autonomous Robotic Systems, 123–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25332-5_11.

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Xu, Juan, Yongfa Hong, Changjun Jiang e Lin Chen. "Upper Bound on Operational Lifetime of Ultra Wide Band Sensor Network". In Wireless Algorithms, Systems, and Applications, 271–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11814856_27.

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Santra, Arpita Barman, e Amiya Kumar Mallick. "Overview of Various Bandwidth Enhancement Techniques for Ultra-Wide Band Antennas". In Computational Advancement in Communication Circuits and Systems, 47–50. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2274-3_6.

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Shabnam, Sharmin, Suvrajit Manna, Udit Sharma e Pinaki Mukherjee. "Optimization of Ultra Wide-Band Printed Monopole Square Antenna Using Differential Evolution Algorithm". In Advances in Intelligent Systems and Computing, 81–89. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2250-7_9.

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Mewara, H. S., M. M. Sharma, Mayank Sharma, Mukesh Gupta e Ajay Dadhich. "A Planar Ultra-Wide Band Antenna Design Using Circularly Truncated Corners and Notches". In Advances in Intelligent Systems and Computing, 713–20. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2517-1_68.

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Anooradha, M. K., A. Amir Anton Jone, Anita Jones Mary Pushpa, V. Neethu Susan e T. Beril Lynora. "An Overview of Ultra-Wide Band Antennas for Detecting Early Stage of Breast Cancer". In Advances in Intelligent Systems and Computing, 551–59. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5148-2_49.

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Rekha, S., Boga Vaibhav, Guda Rahul Teja e Pulluri Sathvik. "Design of Circular Patch Antenna with Square Slot for Wearable Ultra-Wide Band Applications". In Advances in Intelligent Systems and Computing, 761–68. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7088-6_70.

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Daba, Jihad. "Performance of Ultra Wide Band Systems in High-Speed Wireless Personal Area Networks". In Lecture Notes in Electrical Engineering, 911–35. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5558-9_77.

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Atti di convegni sul tema "Ultra wide band optical systems"

Lompe, Thomas, Phillip Woschnik, Kerstin Schlichting, Dario Lago-Rivera, Yuanjie Wu, Tilo Steinmetz, Andreas Fricke, Marc Fischer, Michele Giunta e Ronald Holzwarth. ">1.5 Octave-broad Optical Frequency Comb for Multi-clock Comparisons and Wide-band Spectral Purity Transfer". In CLEO: Science and Innovations, SM2G.5. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_si.2024.sm2g.5.

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We present a system composed of an Er:laser-based ultra-low-noise frequency comb seeding a custom-designed photonic-crystal fiber with 2nJ pulse energies. A super-continuum is obtained spanning from 650nm to 2µm. System qualifications will be presented.

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Omar, Redouan Aoulad, Saad Chakkor, Aziz Dkiouak e Mostafafa Baghouri. "Ultra-Wide Band Microstrip patch antenna for Microwave Imaging". In 2024 International Conference on Circuit, Systems and Communication (ICCSC), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/iccsc62074.2024.10617182.

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Shams, H., A. Kaszubowska-Anandarajah, P. Perry e L. P. Barry. "Optical Generation, Fiber Distribution and air transmission for Ultra Wide Band over Fiber System". In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/ofc.2009.owr2.

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Tang, Jianguan, Liang Li, Huiyong Guo, Haihu Yu, Hongqiao Wen e Minghong Yang. "Distributed acoustic sensing system based on continuous wide-band ultra-weak fiber Bragg grating array". In 25th International Conference on Optical Fiber Sensors, a cura di Youngjoo Chung, Wei Jin, Byoungho Lee, John Canning, Kentaro Nakamura e Libo Yuan. SPIE, 2017. http://dx.doi.org/10.1117/12.2262314.

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Escobar-Landero, Salma, Xiaohui Zhao, Abel Lorences-Riesgo, Dylan Le Gac, Yann Frignac e Gabriel Charlet. "Modeling and Optimization of Experimental S+C+L WDM Coherent Transmission System". In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.th3f.4.

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Using accurate ISRS GN modeling and the fast-converging ASE-NL optimization algorithm, we demonstrate 6.2 Tbit/s throughput improvement in a 2-span ultra-wide-band system thanks to the use of the predicted total and per channel power.

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Wen, Yue, Xiaoxia Zhang e Yu Xiong. "Analysis of the Electro-Optical Properties for Ultra-Wide Band Radio over Fiber Receiving System". In 2012 Symposium on Photonics and Optoelectronics (SOPO 2012). IEEE, 2012. http://dx.doi.org/10.1109/sopo.2012.6271086.

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Le Guennec, Y., e R. Gary. "Optical millimeter-wave frequency conversion of ultra Wide Band- Monocycle in UWB-over-Fiber Down-Link System". In 2007 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/imoc.2007.4404300.

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Alvarez, L. S., R. Parra e T. M. Shay. "High resolution imaging through an ultrahigh background rejection optical filter". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.fmm8.

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The Faraday anomalous dispersion optical filter (FADOF) is a ultra-high background rejection optical filter (105) with an intrinsically wide field of view, fast response time (~1 GHz), and high throughput (95%), and it is an imaging device. We present the results of the first imaging experiments with a FADOF. The experimental setup is as follows: a TV camera is screwed into the FADOF output. Next a target is set up in the field of view of the FADOF imaging system. The FADOF keeps any background light from reaching the camera; therefore, there is no image, until we illuminate the target with a low power cw diode laser tuned to the FADOF pass band frequency (roughly 1 GHz wide). Only when the diode laser is tuned to the correct frequency and illuminates the target does the image appear. We will report the results of these qualitative experiments as well as measure the image quality and the received optical power necessary to generate the image.

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Eisenstein, G., J. M. Wiesenfeld, R. S. Tucker e G. Raybon. "Amplification of High Repetition Rate Picosecond Pulses Using An InGaAsP Traveling-Wave Optical Amplifier". In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.tub6.

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Traveling wave (TW) optical amplifiers with high CW gains and wide band widths have recently been demonstrated at both 1.5 μm [1] and 1.3 μm [2] wavelengths. The use of optical amplifiers in ultra-high bit rate systems, such as those using optical time division multiplexing [3], requires knowledge of their gain characteristics for short (picosecond) optical pulse inputs. The amplification of short pulses has been demonstrated previously in various experiments using both GaAlAs and InGaAsP amplifiers [4-8]. All reported experiments used pulse repetition rates below 100 MHz. Moreover, only one past experiment [8] used an InGaAsP TW amplifier, but the pulses used were not very short (45-90 ps). We report here on the use of a 1.3-μm TW optical amplifier for amplification of picosecond pulses at a high repetition rate. We demonstrate distortionless amplification of 12-ps pulses at a repetition rate of 4 GHz. The amplifier gain was measured to be ~ 10 dB, corresponding to a chip gain of 21 dB, at a facet peak output power of 0.25 W.

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Masuda, H., A. Mori, S. Aozasa e M. Shimizu. "TDFA and ultra-wide band amplifiers". In Optical Amplifiers and Their Applications. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/oaa.2002.otuc1.

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