Recursos de colección

Archivo Digital UPM (107.543 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Optica

Mostrando recursos 1 - 20 de 232

  1. "METHOD": a tool for mechanical, electrical, thermal, and optical characterization of single lens module design

    Besson, Pierre; Domínguez Domínguez, César; Voarino, Philippe; García-Linares Fontes, Pablo; Weick, Clement; Lemiti, Mustapha; Baudrit, Mathieu
    The optical characterization and electrical performance evaluation are essential in the design and optimization of a concentrator photovoltaic system. The geometry, materials, and size of concentrator optics are diverse and different environmental conditions impact their performance. CEA has developed a new concentrator photovoltaic system characterization bench, METHOD, which enables multi-physics optimization studies. The lens and cell temperatures are controlled independently with the METHOD to study their isolated effects on the electrical and optical performance of the system. These influences can be studied in terms of their effect on optical efficiency, focal distance, spectral sensitivity, electrical efficiency, or cell current matching....

  2. Márgenes de eficiencia de la biestabilidad óptica activa en semiconductores

    Solís Ros, Javier; González Marcos, Ana; Martín Pereda, José Antonio
    La importancia de la biestabilidad óptica activa es un hecho conocido, pero el uso de este efecto no lineal requiere de una correcta caracterización del dispositivo, que nos permita determinar las condiciones de polarización del mismo, para una función dada, entre las diversas aplicaciones que ofrece. El presente trabajo describe la metodología empleada para la caracterización de un diodo láser mediante herramientas CAD comerciales. Se presentan los resultados de los parámetros más característicos, contraste y anchura de histéresis, en las condiciones estándar para poder identificar los márgenes de eficiencia.

  3. Simulación de la propagación mediante óptica de rayos en fibras ópticas

    Rincón Cabezas, Óscar
    El proyecto tiene como objetivo estudiar las técnicas de óptica geométrica para analizar el trazado de los frentes de onda de las señales que se propagan por fibras ópticas de Salto de Índice e Índice Gradual. Para ello se ha estudiado la teoría de la denominada técnica de análisis eikonal basada en óptica geométrica. Se ha pretendido hacer un estudio de los distintos tratamientos para estudiar la propagación de los rayos luminosos, empezando por las propiedades que se conocen desde la base que se trabaja como si las ondas fueran en fase, creando el frente de ondas. Así el estudio está...

  4. On the analytical demonstration of Planck-Einstein relation

    Molina Morales, Eddy Luis
    In this paper a possible analytical demonstration of Planck's Law for the spectral distribution of the electromagnetic energy radiated by hot bodies is presented, but in this case, the solutions of Maxwell's equations for the electromagnetic radiation problem of Hertz’s dipole are used. The concepts of quantum energy and of photon are redefined from the classical point of view, relating them to the possible electronic nature of electromagnetic waves and the electromagnetic field in general. Both the physical analysis and the concepts proposed respect the law of conservation of energy and allow to finally express the quantic constant, which is...

  5. On the analytical demonstration of Planck-Einstein relation

    Molina Morales, Eddy Luis
    In this paper a possible analytical demonstration of Planck's Law for the spectral distribution of the electromagnetic energy radiated by hot bodies is presented, but in this case, the solutions of Maxwell's equations for the electromagnetic radiation problem of Hertz’s dipole are used. The concepts of quantum energy and of photon are redefined from the classical point of view, relating them to the possible electronic nature of electromagnetic waves and the electromagnetic field in general. Both the physical analysis and the concepts proposed respect the law of conservation of energy and allow to finally express the quantic constant, which is...

  6. Analysis of a random modulation single photon counting differential absortion lidar system for space-borne CO2 sensing

    Ai, Xiao; Pérez Serrano, Antonio; Quatrevalet, Mathieu; Nock, Richard W.; Dahnoun, Naim; Ehret, Gerhard; Esquivias Moscardo, Ignacio; Rarity, John G.
    The ability to observe the Earth's carbon cycles from space provides scientists an important tool to analyze climate change. Current proposed systems are mainly based on pulsed integrated path differential absorption lidar, in which two high energy pulses at different wavelengths interrogate the atmosphere sequentially for its transmission properties and are back-scattered by the ground. In this work an alternative approach based on random modulation single photon counting is proposed and analyzed; this system can take advantage of a less power demanding semiconductor laser in intensity modulated continuous wave operation, benefiting from a better efficiency, reliability and radiation hardness. Our...

  7. Optical processing, Power response of a modulated general optical system

    Muriel Fernández, Miguel Ángel; Capmany Francoy, José
    Optical processing: Power response of a modulated general optical system

  8. Real-time optical spectrum analyzer

    Muriel Fernández, Miguel Ángel; Martín Pereda, José Antonio
    Real-time optical spectrum analyzer

  9. Dispositivo optoelectrónico biestable para sistemas de fibra óptica

    Beltran Torreira, Rafael; Muriel Fernández, Miguel Ángel
    Dispositivo optoelectrónico biestable para sistemas de fibra óptica

  10. Conmutador 2 x 2 unidireccional para sistemas por fibras ópticas

    Beltran Torreira, Rafael; Muriel Fernández, Miguel Ángel
    Conmutador 2 x 2 unidireccional para sistemas por fibras ópticas

  11. Procesamiento de señales mediante guiaonda óptica monomodo

    Muriel Fernández, Miguel Ángel
    Procesamiento de señales mediante guiaonda óptica monomodo

  12. Procesado Cuántico de la Información : Apuntes

    Muriel Fernández, Miguel Ángel; Rodríguez Fortuño, Francisco José
    Estos apuntes de Procesado Cuántico de la Información, escritos por Francisco José Rodríguez Fortuño, están basados en las clases y el material aportado por el Prof. Miguel Angel Muriel Fernández.

  13. 1D and 2D neutral particle patterning by dielectrophoretic forces on z-cut Fe:LiNbO3 crystals

    Muñoz Martínez, Juan Francisco; Elvira, Iris; Burgos, Hector; Jubera, Mariano; García Cabañes, Angel; Ramiro Diaz, Jose Bruno; Alcazar De Velasco Rico, Angel Manuel; Carrascosa, Mercedes
    1D and 2D patterning of uncharged micro- and nanoparticles via dielectrophoretic forces on photovoltaic z-cut Fe:LiNbO3 have been investigated for the first time. The technique has been successfully applied with dielectric micro-particles of CaCO3 (diameter d = 1-3 μm) and metal nanoparticles of Al (d = 70 nm). At difference with previous experiments in x- and y-cut, the obtained patterns locally reproduce the light distribution with high fidelity. A simple model is provided to analyse the trapping process. The results show the remarkably good capabilities of this geometry for high quality 2D light-induced dielectrophoretic patterning overcoming the important limitations presented by previous...

  14. Methodology of quantifying curvature of Fresnel lenses and its effect on CPV module performance

    Herrero Martin, Rebeca; Domínguez Domínguez, César; Askins, Stephen; Anton Hernandez, Ignacio; Sala Pano, Gabriel
    Fresnel lenses used as primary optics in concentrating photovoltaic modules may show warping produced by lens manufacturing or module assembly (e.g., stress during molding or weight load) or due to stress during operation (e.g., mismatch of thermal expansion between different materials). To quantify this problem, a simple method called “checkerboard method” is presented. The proposed method identifies shape errors on the front surface of primary lenses by analyzing the Fresnel reflections. This paper also deals with the quantification of the effects these curvatures have on their optical performance and on the electrical performance of concentrating modules incorporating them. This method...

  15. Uncertainty Estimation for Performance Evaluation of a Confocal Microscope as Metrology Equipment

    Guarneros, O.; Vicente Oliva, Jesús de; Maya, M.; Ocaña Moreno, José Luis; Molpeceres Alvarez, Carlos Luis; García-Ballesteros Ramírez, Juan José; Rodríguez, S. R.; Duran, H. M.
    Both in industry and research, the quality control of micrometric manufactured parts is based on the measurement of parameters whose traceability is sometimes difficult to guarantee. In some of these parts, the confocal microscopy shows great aptitudes to characterize a measurand qualitatively and quantitatively. The confocal microscopy allows the acquisition of 2D and 3D images that are easily manipulated. Nowadays, this equipment is manufactured by many different brands, each of them claiming a resolution probably not in accord to their real performance. The Laser Center (Technical University of Madrid) has a confocal microscope to verify the dimensions of the micro mechanizing...

  16. Uncertainty in optical bio-sensors due to the spectral displacement of the interference modes of the transduction signal. Incertidumbre en bio-sensores ópticos asociada al desplazamiento espectral de los modos de interferencia de la señal de transducción

    Vicente Oliva, Jesús de; Holgado Bolaños, Miguel; Lavin Hueros, Alvaro; Sanza Gutiérrez, Francisco Javier; Casquel Del Campo, Rafael; Laguna Heras, Maria Fe
    The analysis of the interference modes has an increasing application, especially in the field of optical biosensors. In this type of sensors, the displacement Δν of the interference modes of the transduction signal is observed when a particular biological agent is placed over the biosensor. In order to measure this displacement, the position of a maximum (or a minimum) of the signal must be detected before and after placing the agent over the sensor. A parameter of great importance for this kind of sensors is the period Pν of the signal, which is inversely proportional to the optical thickness h0...

  17. Proposal for a Wavelength Multiplexed Quantum Metropolitan Area Network

    Ciurana Aguilar, Alex; Martínez Mateo, Jesús; Walenta, Nino; Zbinden, Hugo; Peev, Momtchil; Poppe, Andreas; Martín Ayuso, Vicente
    Quantum Key Distribution (QKD) is maturing quickly. However, the current approaches to its network use require conditions that make it an expensive technology. All the QKD networks deployed to date are designed as a collection of dedicated point-to-point links that use the trusted repeater paradigm. Instead, we propose a novel network model in which QKD systems use simultaneously quantum and conventional signals that are wavelength multiplexed over a common communication infrastructure. Signals are transmitted end-to-end within a metropolitan area using optical components. The model resembles a commercial telecom network and takes advantage of existing components, thus allowing for a cost-effective...

  18. High-Power High-Efficiency Laser Power Transmission at 100m Using Optimized Multi-Cell GaAs Converter

    He, Tao; Yang, Su-Hui; Muñoz García, Miguel Angel; Zhang, Hai-Yang; Zhao, Chang-Ming; Zhang, Yi-Chen; Xu, Peng
    A high-power high-efficiency laser power transmission system at 100m based on an optimized multi-cell GaAs converter capable of supplying 9.7W of electricity is demonstrated. An I-V testing system integrated with a data acquisition circuit and an analysis software is designed to measure the efficiency and the I-V characteristics of the laser power converter (LPC). The dependencies of the converter’s efficiency with respect to wavelength, laser intensity and temperature are analyzed. A diode laser with 793nm of wavelength and 24W of power is used to test the LPC and the software. The maximum efficiency of the LPC is 48.4% at an input laser power...

  19. UWB doublet generation employing cross-phase modulation in a semiconductor optical amplifier mach-zehnder interferometer

    Moreno, Vanessa; Rius, Manuel; Mora, José; Muriel Fernández, Miguel Ángel; Capmany, José
    In this paper, a novel method to generate ultrawideband (UWB) doublets is proposed and experimentally demonstrated, which is based on exploiting the cross-phase modulation in a semiconductor optical amplifier (SOA). The key component is an integrated SOA Mach-Zehnder interferometer pumped with an optical carrier modulated by a Gaussian pulse. The transfer function of the nonlinear conversion process leads to the generation of UWB doublet pulses by tuning the SOA currents to different values.

  20. Integrable high order UWB pulse photonic generator based on cross phase modulation in a SOA-MZI

    Moreno, Vanessa; Rius, Manuel; Mora, Jose; Muriel Fernández, Miguel Ángel; Capmany, José
    We propose and experimentally demonstrate a potentially integrable optical scheme to generate high order UWB pulses. The technique is based on exploiting the cross phase modulation generated in an InGaAsP Mach-Zehnder interferometer containing integrated semiconductor optical amplifiers, and is also adaptable to different pulse modulation formats through an optical processing unit which allows to control of the amplitude, polarity and time delay of the generated taps.

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