Dr. David Garcia-Rodriguez
Department of Computer Science, School of Engineering, University of Valencia, Valencia, Spain
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Academic Career Length
13Years (2014-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications18 July 2018 in Optics Express
Journal Article
David Garcia-RodriguezJCJuan L. Corral
Juan L. CorralAGAmadeu Griol
Amadeu Griol
RLRoberto Llorente
Roberto LlorenteIn this paper, we evaluate by means of simulation and experimentally the simultaneous coupling of the LP01x-LP11ax fiber modes and the TE0-TE1 nanophotonic SOI waveguide modes using a grating coupler for a two-mode fiber at 1550 nm. Both the grating width (ranging from 10 µm to 15 µm) and the grating vertical profile have been considered in the design procedure. The optimum design (14 µm width and 609 nm grating period) has been selected in terms of coupling efficiency (both LP01x-TE0 and LP11ax-TE1), compactness and tolerance to lateral misalignments between fiber and coupler. The LP01x-TE0 and LP11ax-TE1 modes achieved coupling efficiencies of 49% and 45%, respectively.
17 March 2017 in Optics Letters
Journal Article
David Garcia-RodriguezJCJuan L. Corral
Juan L. Corral
AGAmadeu Griol
Amadeu GriolRLRoberto Llorente
Roberto Llorente
The use of an integrated asymmetrical directional coupler for two-mode transmission at 1550 nm is analyzed. The design is based on silicon-on-insulator (SOI) technology and permits mode conversion and mode multiplexing/demultiplexing. In the nominal design, mode conversion and mode (de)multiplexing are achieved with 97% efficiency and a 23.4 dB crosstalk level in the 1540–1560 nm band using a 0.1 μm gap. The dimension tolerance of the SOI process has been taken into account in the selection of the optimum design, and the coupling efficiency would remain above 82.3% (corresponding to 0.8 dB excess loss) with 3σ accuracy. A 90% efficiency has been experimentally obtained.
2 November 2015 in IEEE Photonics Technology Letters
Journal Article
JCJuan L. Corral
Juan L. Corral
David Garcia-RodriguezRLRoberto Llorente
Roberto Llorente
The optimal design of a low-loss fused fiber mode-selective coupler for two-mode fiber transmission in the 850-nm band is presented. The coupler is based on precise phase matching of the propagation constants in each arm of a weakly fused fiber coupler. The designed component permits both mode converter and mode multiplexer/demultiplexer operation, thus enabling modal multiplexing transmission in this band with no additional component. The presented design is evaluated by simulation considering two types of structures, leading to asymmetric and symmetric coupler configurations. Mode converter and mode multiplexer operation is achieved with 93.5% efficiency in the band of 845-855 nm. Mode demultiplexer operation is achieved with an extinction ratio better than 20.4 dB in the same band.
17 April 2017 in IEEE Photonics Technology Letters
Journal Article
David Garcia-RodriguezJCJuan L. Corral
Juan L. Corral
RLRoberto Llorente
Roberto Llorente
A mechanical mode converter for Mode Division multiplexed (MDM) systems over SSMF at 850 nm is proposed and evaluated experimentally by the transmission of OOK modulated optical signals. The proposed mode converter is based on a periodic structure defined by the grating period (Λ) parameter and the number of mode coupling points, N. A mechanical grating with N=50 points and a tunable grating period (Λ form 440 μm to 456 μm) has been designed offering a 124 nm tuning bandwidth. The LP01 mode to LP11 mode conversion has been experimentally assessed and a conversion efficiency of 89% has been achieved in the designed device. Optical transmission of OOK modulated signals with 1.25 Gb/s and 2.5 Gb/s bitrates on LP01 mode or a converted LP11 mode is demonstrated achieving BER < 10-9 after 1 km optical transmission over SSMF at 850 nm.
9 May 2024 in Ecological Informatics
Journal Article
David Garcia-RodriguezPRPablo Catret Ruber
Pablo Catret Ruber
DFDomingo J. Iglesias Fuente
Domingo J. Iglesias Fuente
JDJuan José Martínez Durá
Juan José Martínez Durá
Ernesto Lopez-BaezaACAntonio Garcia Celda
Antonio Garcia Celda
17 May 2018 in Optics Letters
Journal Article
David Garcia-RodriguezJCJuan L. Corral
Juan L. CorralRLRoberto Llorente
Roberto LlorenteThe supermode analysis of asymmetrical directional couplers (ADC) based on SOI technology for strip and ridge structures at 1550 nm is herein reported, targeting to reduce ADC device fabrication requirements. The reported analysis based on supermodes permits us to assess the sensitivity of the ADC coupling efficiency by calculating the index difference between even and odd supermodes. Optimum designs have been found for 100 and 400 nm gaps, respectively, capable of converting and (de) multiplexing both and modes taking into account the width, gap, height, and slab thickness variations produced with respect to the nominal design.
About Me
Dr. David García-Rodríguez is an Assistant Professor at the Universitat de València (Spain) and a researcher at IRTIC. He received his Ph.D. in Telecommunications Engineering from the Universitat Politècnica de València in 2018. His research focuses on Earth Observation and remote sensing, with particular emphasis on GNSS-R/GNSS-IR, soil moisture and vegetation monitoring, environmental sensing, and the integration of satellite and in situ observations. His current work also explores Artificial Intelligence and Machine Learning for Earth Observation, semantic technologies, Linked Open Data, FAIR data principles, and interoperable frameworks for large-scale environmental data. He has participated in research activities related to satellite product validation, environmental monitoring infrastructures, and the development of semantic and data-driven approaches for Earth Observation.
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