Browsing by Subject "Diodes"

Now showing items 1-20 of 21

    • Beam-combining scheme of high-power broad-area semiconductor lasers with Lyot-filtered reinjection: modeling, simulations, and experiments 

      Brée, Carsten; Raab, Volker; Montiel Ponsoda, Joan; Staliunas, Kestutis; Garre Werner, Guillermo (2019-07-01)
      Article
      Open Access
      A brightness- and power-scalable polarization beam-combining scheme for high-power, broad-area semiconduc-tor laser diodes is investigated numerically and experimentally. To achieve the beam combining, we employ Lyot-filtered ...

    • Caracterización de diodos láser tipo Distributed Feedback 

      Guzman Torres, Carlos (Universitat Politècnica de Catalunya, 2011-06-30)
      Bachelor thesis
      Open Access

    • Carrier selective contact characterization using work function bender buffer layers 

      Capella Guardià, Francesc Xavier (Universitat Politècnica de Catalunya, 2022-06)
      Bachelor thesis
      Open Access
      2D materials emerge with a promising future for optoelectronics. First reported in 2011, MXenes have excellent properties such as metallic-like conductivity and high transmittance, thus, they can be used as transparent ...

    • Clamping diode caused distortion in multilevel NPC Full-Bridge audio power amplifiers 

      Sala Caselles, Vicenç; Salehi Arashloo Arashloo, Ramin; Moreno Eguilaz, Juan Manuel; Salehifar, Mehdi; Romeral Martínez, José Luis (2012)
      Conference report
      Restricted access - publisher's policy
      This paper presents a study and analysis of the distorting effects of clamped diodes in multilevel DCI-NPC topology applied to high power and high quality audio-amplifier. The main distorting sources of error are characterized, ...

    • Cooperative precoding for multi-user visible light communications with imperfect channel knowledge 

      San, Guillermo (Universitat Politècnica de Catalunya, 2018-07-02)
      Bachelor thesis
      Restricted access - confidentiality agreement

    • Design and implementation of a radio wake up reciber 

      Vila Bagaria, David (Universitat Politècnica de Catalunya, 2018-06)
      Bachelor thesis
      Restricted access - confidentiality agreement
      Wi-Fi is the facto standard protocol for most indoor personal communication devices. Despite this, its usage in IoT solutions is limited, mainly due to the high cost and elevated power consumption of Wi-Fi transceivers. ...

    • Design of minimum nonlinear distortion reconfigurable antennas for next-generation communication systems 

      Ramírez Arroyave, Germán Augusto; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís; Araque Araque, Javier Leonardo; Cetiner, Bedri Artug; Jofre Roca, Lluís (Multidisciplinary Digital Publishing Institute (MDPI), 2022-03-01)
      Part of book or chapter of book
      Open Access
      Nonlinear effects in the radio front-end can degrade communication quality and system performance. In this paper we present a new design technique for reconfigurable antennas that minimizes the nonlinear distortion and ...

    • Diseño de luminaria Indoor con tecnología LED y con control DALI 

      Bono Segura, Manuel (Universitat Politècnica de Catalunya, 2016)
      Master thesis (pre-Bologna period)
      Restricted access - confidentiality agreement

    • Diseño y puesta en marcha de un banco de medidas de caracterización de diodos láser semiconductores 

      Tous Requillard, Eduard (Universitat Politècnica de Catalunya, 2010-09-23)
      Bachelor thesis
      Open Access

    • Estudio de la reconstrucción del perfil espacial del haz en láseres de diodos de alta potencia 

      Aguado Arumi, Carlos (Universitat Politècnica de Catalunya, 2018-09-10)
      Bachelor thesis
      Open Access
      El presente trabajo tiene como objetivo principal diseñar, automatizar e implementar un método para la caracterización de perfiles espaciales de haces de luz, emitidos por láseres de diodo de alta potencia. Mediante medidas ...

    • Experimental study of the neuron-like dynamics of a semiconductor laser with optical feedback and current modulation 

      Tiana Alsina, Jordi; Quintero Quiroz, Carlos Alberto; Masoller Alonso, Cristina (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2020)
      Conference report
      Open Access
      Excitable lasers that mimic neuronal activity can be building blocks of ultra-fast neuro-inspired information processing systems, which can revolutionize the fields of optical signal processing, optical computing and ...

    • Interchain and intrachain emission branching in polymer light-emitting diode doped by organic molecules 

      Krautz, D.; Lunedei, E.; Puigdollers i González, Joaquim; Badenes, Gonçal; Alcubilla González, Ramón; Cheylan, Stephanie (2010-01-18)
      Article
      Open Access
      A blend of the polymer poly 2- 2-ethylhexyloxy -5-methoxy-1,4-phenylenevinylene MEH-PPV and the electron-transport molecule tris- 8-hydroxyquinoline aluminum Alq3 has been investigated by means of electroluminescence ...

    • Investigation and design of varactor-based reconfigurable intelligent surfaces for FR3 band 

      Díaz Soto, Martín (Universitat Politècnica de Catalunya, 2024-10-31)
      Master thesis
      Open Access
      Covenantee:   Technische Universität Berlin
      This thesis investigates the design of reflective Reconfigurable Intelligent Surfaces (RIS) using varactor diodes, specifically targeting the FR3 frequency band for future 6G applications. RIS technology can be an important ...

    • Pentacene thin-films obtained by thermal evaporation in high vacuum 

      Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal; Orpella García, Alberto; Martín García, Isidro; Vetter, Michael; Alcubilla González, Ramón (2003-03)
      Article
      Restricted access - publisher's policy
      Pentacene thin-films were obtained by thermal evaporation in high vacuum of a pure (98%) commercially available source. All the samples were grown at room temperature (25 °C) and high deposition rates (>20 Å/s) on Corning ...

    • SiC Schottky diode electrothermal macromodel 

      Masana Nadal, Francisco (2010)
      Conference report
      Open Access
      This paper presents a SiC Schottky diode model including static, dynamic and thermal features implemented as separate parameterized blocks constructed from SPICE Analog Behavioral Modeling (ABM) controlled sources. The ...

    • Solar module emulator based on a low-cost microcontroller 

      Boucharef,, Abdelkadir; Tahri, Ali; Tahri, Fatima; Silvestre Bergés, Santiago; Bourahla, Mohamed (2022-01-03)
      Article
      Open Access
      The aim of this paper is to present an experimental analysis of a solar module emulator based on a low-cost microcontroller. An Arduino low-cost microcontroller is used to mimic several solar module technologies with high ...

    • Technical improvements applied to a double-pass setup for performance and cost optimization 

      Sanabria Ortega, Fernando Guillermo; Aldaba Arévalo, Mikel; Díaz Douton, Fernando; García Guerra, Carlos Enrique; Pujol Ramo, Jaume (2014-06-01)
      Article
      Open Access
      We have studied the possibility of improving the performance, simplifying, and reducing the cost of a double-pass system by the use of alternative technologies. The system for correcting the spherical correction has been ...

    • Three-port frequency-selective absorptive limiter 

      Hueltes Escobar, Alberto; Rocas Cantenys, Eduard; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Orloff, Nathan D.; Booth, James C.; García Pastor, David; Perea Robles, Rafael (2017-04-24)
      Article
      Open Access
      This letter describes a novel three-port absorptive limiter for frequency-selective circuits based on a configuration similar to a conventional 90° hybrid coupler. This circuit uses the switching behavior of common diodes ...

    • Transmittance measurement of the in vivo human eye with a double-pass system 

      Sánchez, Roberto; De Paul, Aníbal; Burgos Fernández, Francisco Javier; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Issolio, Luis A. (2021)
      Article
      Open Access
      Purpose: To develop a methodology based on a double-pass system to obtain information about the transmittance of ocular media. Methods: The procedure consists of recording double-pass images at different powers of a laser ...

    • Voltage band based global MPPT controller for photovoltaic systems 

      Gokmen, Nuri; Karatepe, Engin; Ugranli, Faruk; Silvestre Bergés, Santiago (2013-09)
      Article
      Restricted access - publisher's policy
      This paper presents a new maximum power point tracking algorithm for PV systems useful in case of non-uniform irradiance conditions. This algorithm takes into account the number of bypass diodes in a PV string to calculate ...