Exploració per tema "Laser communication systems"

Ara es mostren els items 1-20 de 22

    • 1.25–2.5 Gb/s simple nyquist transmitters for coherent UDWDM-PON with enhanced spectral efficiency 

      Velásquez Micolta, Juan Camilo; Tabares Giraldo, Jeison; Cano Valadez, Iván Nicolás; Prat Gomà, Josep Joan (2018-04-19)
      Article
      Accés obert
      We present a coherent ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON) with enhanced spectral efficiency. The benefit of using Gaussian or Nyquist pulse-shaping filters at the transmitter ...

    • 15-dB differential link-loss UDWDM-PON with direct beat phase modulated DFBs 

      Velásquez Micolta, Juan Camilo; Cano Valadez, Iván Nicolás; Polo Querol, Víctor; Domingo Ribé, Marc; Prat Gomà, Josep Joan (2017-11-21)
      Article
      Accés obert
      IEEE A 15 dB differential link-loss ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON) with two optical network units (ONU) spectrally spaced 6.25 GHz is experimentally implemented and tested. ...

    • 6.25Gb/s differential duobinary transmission in 2GHz BW limited direct phase modulated DFB for udWDM-PONs 

      Cano Valadéz, Iván Nicolás; Lerín de la Santísima Trinidad, Adolfo; Presi, Marco; Polo Querol, Víctor; Ciaramella, Ernesto; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A differential duobinary codification is proposed for directly phase modulating a 2GHz BW equalized DFB laser. The method was tested with homodyne coherent detection achieving 6.25Gb/s bitrate transmission with -38.5dBm ...

    • Application on minimizing residual AM in DPSK UDWDM-PON ONU by integrated dual-EML 

      Chu Guang, Yong; Cano Valadéz, Iván Nicolás; Polo Querol, Víctor; Prat, Josep (2016-06-01)
      Article
      Accés obert
      A monolithically integrated dual electroabsorption modulated laser (DEML), consisting of distributed feedback laser (DFB) and electroabsorption modulator (EAM) sections, is proposed as a transmitter in an optical network ...

    • Comunicación láser por puerto RS-232 

      Darío Ramos García, Elton (Universitat Politècnica de Catalunya, 2009-01-30)
      Projecte/Treball Final de Carrera
      Accés obert
      El objetivo principal de este Proyecto Final de Carrera es el diseño de un enlace óptico entre ordenadores a través del puerto RS-232, también conocido como puerto serie. Básicamente se trata de diseñar y construir parte ...

    • Design and implementation of multi-spectral remote sensing capabilities in the U.P.C. lidar system 

      Kumar, Dhiraj; Rocadenbosch Burillo, Francisco (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial

    • Digital equalization of time-delay array receivers on coherent laser communications 

      Belmonte Molina, Aniceto (2017-01-15)
      Article
      Accés obert
      Field conjugation arrays use adaptive combining techniques on multi-aperture receivers to improve the performance of coherent laser communication links by mitigating the consequences of atmospheric turbulence on the ...

    • Direct phase modulation DFBs for cost-effective ONU transmitter in udWDM PONs 

      Cano Valadéz, Iván Nicolás; Lerín de la Santísima Trinidad, Adolfo; Polo Querol, Víctor; Prat Gomà, Josep Joan (2014-05-15)
      Article
      Accés restringit per política de l'editorial
      A technique for direct phase modulating a low-cost distributed feedback laser is presented for user transmitter in ultra dense wavelength division multiplexing passive optical networks. It consists of a simple RC network, ...

    • Direction-sensitive transverse velocity measurement by phase-modulated structured light beams 

      Rosales Guzmán, Carmelo; Hermosa, Nathaniel; Belmonte Molina, Aniceto; Pérez Torres, Juan (2014-09-15)
      Article
      Accés restringit per política de l'editorial
      The use of structured light beams to detect the velocity of targets moving perpendicularly to the beam's propagation axis opens new avenues for remote sensing of moving objects. However, determining the direction of motion ...

    • DQPSK directly phase modulated DFB for flexible coherent UDWDM-PONs 

      Cano Valadéz, Iván Nicolás; Lerín de la Santísima Trinidad, Adolfo; Prat Gomà, Josep Joan (2015-09-15)
      Article
      Accés obert
      A bandwidth-limited distributed feedback laser directly phase modulated with a 5-Gb/s differential quadrature phase shift keying (DQPSK) signal is demonstrated in a statistical ultra-dense wavelength division multiplexing ...

    • Electronics for Analog Signal Processing in an Optical Phased Array 

      Martínez Alfara, Aaron (Universitat Politècnica de Catalunya, 2013-10-15)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      Optical free-space communication will be a key building block for future information systems. However, when the link includes part of the atmosphere, clear-air turbulence induces serious phase distortions and fading to the ...

    • Estudio, diseño y prueba de comunicaciones ópticas entre CubeSats 

      Domínguez Cachinero, Cristian (Universitat Politècnica de Catalunya, 2019-06-10)
      Treball Final de Grau
      Accés obert
      Cualquier satélite necesita un sistema de comunicación que permita enviar losdatos que obtiene a un destinatario que los procese e interprete.Este destinatario puede estar en tierra o encontrarse en la misma órbita o una ...

    • Experimental analysis of adaptive optics compensation in free-space coherent laser communications 

      Anzuola, Esdras; Belmonte Molina, Aniceto (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work we present a practical, experimental analysis of the effects of adaptive optics compensation on the performance of free-space coherent optical receivers. In order to fulfill this objective, we have developed ...

    • Hybrid testbed of a free-space laser communications system for atmospheric turbulence compensation 

      González Rodríguez, Marta (Universitat Politècnica de Catalunya, 2016-07-27)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      In the last few years free-space laser communications have become a feasible and high-bandwidth wireless alternative to fiber optic cabling and radio frequency (RF) systems due to its extremely robustness against interference ...

    • Increasing the range of an Infrared Laser sensor 

      Ibrouchene, Mohamed Nassim (Universitat Politècnica de Catalunya, 2011-04-11)
      Projecte/Treball Final de Carrera
      Accés restringit per decisió de l'autor
      Català: Sortit per primera vegada en el any 2008, el SRL és utilitzat per detectar vehicles apropant al davant i, si necesari, començar una maniobra de emergència. El sensor en l'estat actual té un abast de 14 metres. ...

    • Measurement of the carrier-envelope phase stability of a novel mid-infrared source 

      Künzel, Swen Erich (Universitat Politècnica de Catalunya, 2010-09-09)
      Projecte Final de Màster Oficial
      Accés obert
      The control and stability of the carrier-envelope phase of few-cycle pulses are crucial issues in attoscience. This project reports on a novel few-cycle mid-infrared source based on optical parametric chirped pulse ampli ...

    • Modulación directa de diodos láser de alta velocidad para sistemas de transmisión coherente 

      Lerín y de la Santísima Trinidad, Adolfo (Universitat Politècnica de Catalunya, 2012)
      Projecte/Treball Final de Carrera
      Accés obert
      [ANGLÈS] The development of new optical networks is related with the capacity to arrive to cost effective solutions. For this reason is necessary a reduction in the number of devices into the network. In this way is possible ...

    • Proyecto de simulador de comunicaciones ópticas entre satélites LEO, GEO y Tierra 

      Bonet Manzanares, Mar (Universitat Politècnica de Catalunya, 2023-07-21)
      Projecte Final de Màster Oficial
      Accés obert
      En los últimos años, el número de satélites en el espacio ha crecido debido a la demanda de servicios basados en satélites. Los satélites pueden proporcionar distintos servicios, como por ejemplo, proporcionar servicios ...

    • Square-wave switching in vertical-cavity surface-emitting lasers with polarization-rotated optical feedback: Experiments and simulations 

      Sukow, David; Gilfillan, Taylor; Pope, Brenton; Torre, Maria S.; Gavrielides, A.; Masoller Alonso, Cristina (2012-09-12)
      Article
      Accés obert
      We study experimentally the dynamics of vertical-cavity surface-emitting lasers (VCSELs) with polarization-rotated (PR) optical feedback, such that the natural lasing polarization of a VCSEL is rotated by 90 deg and then ...

    • Synchronized ultrashort pulse generation via self-phase modulation using a photonic crystal fiber for electro-optic sampling in the mid infrared 

      Elu Etxano, Ugaitz (Universitat Politècnica de Catalunya, 2015-10-23)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      Electro-optical sampling (EOS) is ideally suited to directly measure electric field THz waveforms. Translation of EOS into the mid-IR (7 μm) requires optically synchronized ultrashort pulses with duration of half a cycle ...