• A broadband polarization splitter directional coupler based on tilted subwavelengh grating metamaterials 

      Luque-González, José Manuel; Herrero-Bermello, Alaine; Ortega-Moñux, Alejandro; Sánchez-Rodriguez, Marina; Velasco, Aitor V.; [et al.] (2020-12-03)
      Tilted subwavelength gratings (SWG) allows anisotropy tailorable metamaterials with applications in polarization management. Based on this concept, here we experimentally demonstrate a broadband directional-couplerbased ...
    • A general approach for robust integrated polarization rotators 

      Alonso-Ramos, C.; Halir, Robert; Ortega-Moñux, Alejandro; Cheben, Pavel; Vivien, Laurent; [et al.] (International Society for Optics and Photonics, 2013)
      Integrated polarization rotators suffer from very high sensitivity to fabrication errors. A polarization rotator scheme that substantially increases fabrication tolerances is proposed. In the proposed scheme, two tunable ...
    • Automatic design of high-performance fiber-chip surface grating couplers based on Floquet-Bloch mode analysis 

      Sánchez Postigo, Alejandro; Xu, Dan-Xia; Hadij-Elhouati, Abdelfettah; Molina-Fernandez, Iñigo; Ortega-Moñux, Alejandro; [et al.] (2018-04-30)
      We propose a new strategy to automatically design highly efficient fiber-chip surface grating couplers. High performance designs are achieved with a substantially reduced computational cost by combining Floquet-Bloch mode ...
    • Butler Matrix Based Six-port Passive Junction 

      Moscoso Mártir, Álvaro; Ávila Ruiz, Jose Manuel; Durán Valdeiglesias, Elena; Moreno Pozas, Laureano; Molina-Fernandez, Iñigo; [et al.] (2014-02-03)
      In this work we propose the utilization of the Butler matrix as a six-port I/Q demodulator. The inherent symmetry of its topology allows to overcome the intrinsic amplitude and phase imbalances of the traditional approaches ...
    • Caracterización y Simulación de un Diodo Schottky de Microondas 

      Moreno Pozas, Laureano; Durán Valdeiglesias, Elena; Ávila Ruiz, Juan Manuel; Molina-Fernandez, Iñigo (2013-09)
      Microwave diode models included in commercial simulators use a large set of parameters, so they are often difficult to set up in order to match the actual response of a specific device. In this paper a simple model for a ...
    • Circuitos de Radiofrecuencia de Banda Ultra-Ancha en Tecnología Planar Integrada: Aplicación a Receptores de Seis Puertos 

      Moscoso Mártir, Álvaro (Servicio de Publicaciones de l Universidad de Málaga, Servicio de Publicaciones, 2013)
      Se presenta el diseño, implementación y evaluación experimental de un demodulador I/Q de seis puertos analógico de altas prestaciones, capaz de operar en la banda de 3.1 a 10.6 GHz sin necesidad de técnicas de calibración. ...
    • Colorless devices and reception techniques for polarization multiplexed communications 

      Halir, Robert; Reyes-Iglesias, Pedro Jose; Alonso-Ramos, C.; Sarmiento-Merenguel, Darío; Wanguemert-Perez, Juan Gonzalo; [et al.] (2015-06-29)
      Future optical networks call for flexible, high performance and low cost coherent optical receivers. We present here several advances towards such receivers, including integrated optical couplers with ultra-broad bandwidth, as ...
    • Comparing the fundamental limit of detection for interferometric and resonant biosensors with coherent phase read-out 

      Leuermann, Jonas; Molina-Fernandez, Iñigo; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert (2019-06-27)
      We compare the limit of detection of coherently interrograted photonic biosensors, using both interferometric and resonant architectures.
    • Customized spectral filters using cladding-modulated Bragg gratings in silicon waveguides. 

      Pereira-Martín, Daniel; Ortega-Moñux, Alejandro; Luque-González, José Manuel; Hadij-ElHouati, Abdelfettah; Sánchez-Postigo, Alejandro; [et al.] (European Optical Society Annual Meeting (EOSAM) 2021., 2021-09-13)
      Waveguide Bragg gratings are expected to play an important role in diverse applications of photonic integrated circuits. Here, we present our latest progress in implementing Bragg filters with a customized spectral response ...
    • Desarrollo de herramientas numéricas para el análisis y diseño de dispositivos fototónicos 

      Ortega-Moñux, Alejandro (Universidad de Málaga,Servicio de Publicaciones, 2008)
      En esta Tesis, el objetivo fundamental es mejorar las prestaciones de una familia de técnicas numéricas de simulación de dispositivos ópticos que se conoce con el nombre genérico de Métodos Globales o Espectrales. ...
    • Design of arbitrary optical filters in silicon-on-insulator using evanescently-coupled Bragg gratings 

      Pereira-Martín, Daniel; Ortega-Moñux, Alejandro; Molina-Fernandez, Iñigo; Luque-González, José Manuel; Cheben, Pavel; [et al.] (2019-07-10)
      Spectral filters are experiencing an increasing demand in several applications of the silicon- on-insulator (SOI) platform. Many works have demonstrated that arbitrary frequency responses can be synthesized by apodizing ...
    • Design of subwavelength grating metamaterial waveguides for communications and sensing applications 

      Ortega-Moñux, Alejandro; Luque-González, José Manuel; Pereira Martín, Daniel; Sánchez Postigo, Alejandro; Hadij ElHouati, Abdel; [et al.] (2019-07-04)
      In this work we will cover some of our recent advances in the design of state-of-the-art silicon photonic devices based on all-dielectric subwavelength grating (SWG) metamaterials. Specifically, we will focus on the design ...
    • Designing anisotropy with waveguide subwavelength structures 

      Herrero-Bermello, Alaine; Velasco, Aitor; Schmid, Jens; Cheben, Pavel; Halir, Robert; [et al.] (2018-07-12)
      Silicon sub-wavelength structures have become a versatile design tool for practical, high-performance integrated optical devices, ranging from highly efficient grating couplers to ultra-broadband beam-splitters. Recently, ...
    • Designing polarization management devices by tilting subwavelength grating structures 

      Luque-González, José Manuel; Herrero-Bermello, Alaine; Ortega-Moñux, Alejandro; Molina-Fernandez, Iñigo; Velasco, Aitor V.; [et al.] (2019-05-03)
      Subwavelength gratings (SWG) are periodic structures which behave as controllable homogeneous metamaterials. SWGs are extremely interesting when they are used in platforms with a limited choice of material refractive indices, ...
    • Diffractive sidewall grating coupler: towards 2D free-space optics on chip. 

      Hadij-ElHouati, Abdelfettah; Cheben, Pavel; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert; [et al.] (2019-05-02)
      Silicon photonics has been the subject of intense research efforts. In order to implement complex integrated silicon photonic devices and systems, a wide range of robust building blocks is needed. Waveguide couplers are ...
    • Discriminador de frecuencia basado en resonadores “dual-mode” sintonizables 

      Moscoso Mártir, Álvaro; Molina-Fernandez, Iñigo; Hong, Jiasheng (2013-09)
      In this paper a novel varactor-tuned frequency discriminator that makes use of two tunable dual-mode microstrip resonators is demonstrated. In this circuit, the two tuned modes of the resonators are used independently to ...
    • Diseño de dispositivos pasivos de microondas en tecnologías planares multicapa 

      Lopez Berrocal, Benito (UMA Editorial, 2017-09-20)
      Las tecnologías planares multicapa son clave en el desarrollo de transceptores compactos, como los utilizados para los sistemas de comunicaciones multi-estándar actuales, ya que proporcionan una alta capacidad de integración ...
    • Diseño de filtros ópticos integrados con respuesta espectral arbitraria en tecnología de silicio sobre aislante 

      Pereira-Martín, Daniel; Wanguemert-Perez, Juan Gonzalo; Molina-Fernandez, Iñigo; Cheben, Pavel; Schmid, Jens H.; [et al.] (2019-09-10)
      Silicon photonics is one of the most promising technologies nowadays, with myriads of potential applications in communications and sensing. Many of these applications require spectral filters synthesizing arbitrary frequency ...
    • Diseño de filtros paso-banda mediante cavidades resonantes en tecnología SIW multicapa 

      De-Oliva-Rubio, Jose; López Berrocal, Benito; Molina-Fernandez, Iñigo (2017)
      This document discusses the design of coupled resonators band-pass microwave filters. The resonators are implemented as substrate integrated waveguide (SIW) rectangular cavities, which are piled vertically in a multilayer ...
    • Diseño de grating couplers de orden cero de banda ancha y alta eficiencia para el infrarrojo medio 

      Sánchez-Postigo, Alejandro; Wanguemert-Perez, Juan Gonzalo; Luque-Gonzaléz, José Manuel; Molina-Fernandez, Iñigo; Cheben, Pavel; [et al.] (2017-09-27)
      The mode fields of optical fibers and high-index contrast photonic waveguides have different dimensions, making difficult the coupling of light from one to the other. To solve this problem, surface grating couplers are one ...