Vidal Rodriguez, Borja
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- PublicationChroma Key wthout Color Restrictions based on Asynchronous Amplitude Modulation of Background Illumination on Retroreflective Screens(Society of Photo-optical Instrumentation Engineers (SPIE), 2016-03) Vidal Rodriguez, Borja; Lafuente, Juan Alberto; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología NanofotónicaA simple technique to avoid color limitations in image capture systems based on chroma key video composition using retroreflective screens and light-emitting diodes (LED) rings is proposed and demonstrated. The combination of an asynchronous temporal modulation onto the background illumination and simple image processing removes the usual restrictions on foreground colors in the scene. The technique removes technical constraints in stage composition, allowing its design to be purely based on artistic grounds. Since it only requires adding a very simple electronic circuit to widely used chroma keying hardware based on retroreflective screens, the technique is easily applicable to TV and filming studios.
- PublicationTunable Optical Delay Line based on Single-Sideband Suppressed-Carrier Modulation(Institute of Electrical and Electronics Engineers (IEEE), 2013-01-01) Palací López, Jesús; Vidal Rodriguez, Borja; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología NanofotónicaA technique to electrically control the time shift of ultrashort optical pulses without the generation of replicas is demonstrated on the basis of frequency-to-time conversion and single-sideband suppressed-carrier modulation of the optical spectrum. Pulses are advanced or delayed according to the modulated sideband. The time shift depends on the intensity of the frequency-to-time conversion and the frequency of the electro-optical modulation. The technique can be applied to pulses with any duration although it is susceptible to pulse widening because of the combined effect of nonlinear frequency-to-time conversion and electro-optical modulation. Experimental results show dynamic shifting of ultrashort optical pulses up to 100 ps at the expenses of widening originating from the third-order dispersion of the fiber. © 2012 IEEE.
- PublicationCódigos de Hamming(Universitat Politècnica de València, 2009-06-03T12:50:04Z) Vidal Rodriguez, Borja; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología NanofotónicaDescripción del algoritmo del código Hamming de corrección de errores
- PublicationDetermination of refractive index and thickness of a multilayer structure with a single terahertz time domain spectroscopy measurement(Optical Society of America, 2014-08-01) Sanjuan, Federico; Bockelt, Alexander; Vidal Rodriguez, Borja; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; Ministerio de Economía y CompetitividadA processing technique for the determination of the average refractive index and thickness of a two-layer system is presented. It is based on a single measurement with a standard terahertz time-domain spectrometer and the multilayer system thickness. The technique relies on the interference caused by the main pulse with the echoes produced in each material. This approach allows noninvasive inspection of double-layer compound products. (C) 2014 Optical Society of America
- PublicationDual-band hybrid fiber-wireless delivery system for high-speed data communications in CRAN based on polarization multiplexing with switching capabilities(Elsevier, 2024-11-01) Zoireff, Gustavo; Caso, P. A. Costanzo; Vidal Rodriguez, Borja; Rossini, L. A. Bulus; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica[EN] This work presents a Radio-over-Fiber architecture for Cloud Radio Access Networks (CRAN) based on polarization division multiplexing for delivering up-converted high-speed data signals using a single laserphotodetector pair and free of polarization tracking devices. This system enables the allocation of data signals in two different bands defined as low-frequency (5-25 GHz) and high-frequency (55-65 GHz) millimeter waves (mmWave). Polarization multiplexing ensures minimal crosstalk when data signals are photonically upconverted while providing all-optical inter-band switching capabilities. Proof-of-concept experiments have been performed by simultaneously transmitting NRZ and multi-carrier modulated (Discrete Multitone - DMT) data signals over a radio-over-fiber link consisting of 1 km of standard optical fiber and radio transmission in the 7.5 GHz (wired) and 60 GHz (wireless) bands, respectively, with an estimated potential total throughput of at least 7.5 Gbps when considering the transmission of NRZ signals in these mmWave carriers. Results exhibit a BER below the FEC limit of 3.8 x 10-3 in all cases analyzed when the received optical power at the remote radio head (RRH) is above -4 dBm. The reduced number of components and versatility of this implementation provide a cost-effective solution for delivering and switching high-speed data signals in RF fronthaul for future 5G/6G communications.
- PublicationDynamic Filtering of Microwave Signals Through Brillouin-Based Polarization-Sensitive Balanced Detection(Institute of Electrical and Electronics Engineers, 2021-04) Zoireff, Gustavo; Samaniego, Diego; Vidal Rodriguez, Borja; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica[EN] A new photonic technique to implement both stopband and passband microwave filters is presented and demonstrated. The principle of operation relies on controlling the state of polarization of the band of interest using stimulated Brillouin scattering-based polarization rotation and the optoelectronic conversion of this polarization-structured signal by means of a polarization sensitive balanced photodetection. Using the proposed architecture, the filter response can be dynamically switched to implement a stopband or a passband response with the same scheme, thus enhancing its flexibility and application potential. Experiments with a single stage show that very high stopband rejection can be implemented, 67 dB, which for the best of our knowledge is the highest stopband rejection for a photonic microwave notch filter reported to date. Measurements also show that the filter response can be dynamically changed to implement a bandpass response.
- PublicationRedes de acceso en fibra(Universitat Politècnica de València, 2019-06-25T09:18:37Z) Vidal Rodriguez, Borja; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología NanofotónicaEl vídeo revisa los motivos de la proliferación de ofertas de conexión mediante fibra óptica para hogares.
- PublicationSingle bandpass photonic microwave filter based on a notch ring resonator(Institute of Electrical and Electronics Engineers (IEEE), 2010-09-01) Palací López, Jesús; Villanueva Ibáñez, Guillermo Eduardo; Galán Conejos, José Vicente; Martí Sendra, Javier; Vidal Rodriguez, Borja; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; European Commission; Universitat Politècnica de València; Ministerio de Ciencia e Innovación[EN] A novel tunable single bandpass photonic microwave filter is proposed. It is based on optically filtering one of the sidebands of a phase-modulated optical carrier by means of the notch response of a silicon-on-insulator ring resonator. The filter response can be tuned by changing the laser wavelength. Experimental results to prove the concept are provided.
- PublicationAnalysis of short-term polarization stability using Allan variance(The Optical Society, 2024-05-06) Vidal Rodriguez, Borja; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; Agencia Estatal de Investigación[EN] The application of Allan variance to characterize the stability of optical signals affected by stochastic polarization fluctuations and the identification of the underlying power law noise processes is explored. Allan variance can ease the comparison regarding polarization stability of optical systems affected by polarization noise and define a near -optimum integration interval to reveal trends. Examples of the application of Allan variance to optical systems with stable polarization conditions show that white noise and random walk terms can be observed. Additionally, experiments show that the three Stokes parameters can exhibit different statistical behaviors in the Brownian -noise regime. Allan analysis can easily be used to define, in real-time systematically, the denoising strategy in polarization -based sensing and for the optimization of polarization -sensitive optical systems instead of the conventional approach relying on heuristics or information criteria.
- PublicationWide-Band Nulling System for Antenna Array based on a Photonic Microwave Filter and Optical Delay Lines(Elsevier, 2009-10-01) Mengual Chulia, Teresa; Vidal Rodriguez, Borja; Martí Sendra, Javier; Departamento de Física Aplicada; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural[EN] A nulling system for phased array antennas with broad bandwidth and reduced complexity is presented. The system is based on combining the output of an optical beamforming network with an optical transversal filter steered in the angle where a null is desired in a configuration that reduces the number of optoelectronic conversion compared to previous proposals. Preliminary experimental results to show the feasibility of the concept are provided between 2 and 6 GHz, showing null depths of 22, 10 and 19 dB at 2. 5 and 6 GHz, respectively.