Sagnac loop in ring resonators for tunable optical filters

General filter architecture using co- and counterpropagation signals are studied. A specific configuration based on a Sagnac loop within a ring resonator is analyzed. Novel tuning, apart from conventional tuning, is achieved by changing the coupling ratio of a coupler through the adjustment of the equivalent loop length. Full equations describing the filter behavior in passive and active configurations, and simple closed-form formulas to compute the tuning, tolerance, and full-width at half-maximum are reported. The performance of these devices is discussed for their application as selective or channel-dropping ultra-narrow-band filters. The effect of losses and their dispersion properties are also discussed. These devices can be conveniently implemented, using silicon- or InP-integrated optic technology, for they have high free spectral ranges.Publicad

Tropical Medicine: Sleeping Sickness

[ES]Raquel Cade (Angie Dickinson), una misionera, viaja al Congo Belga en 1939 para ayudar como enfermera al Dr. Bikel (Douglas Spencer) en el Hospital de la Misión de Dibela. Nada más llegar, el médico fallece de un ataque cardiaco y Raquel tiene que enfrentarse con las costumbres y creencias religiosas de los nativos. El coronel Henry Derode (Peter Finch), el jefe del destacamento del Ejército belga, le ofrece ayudarla a abandonar el lugar pero no acepta. Las cosas van mal, pero todo cambia cuando se ve obligada a intervenir a un niño de una apendicitis aguda, a partir de ese momento la tribu estará dividida. Su situación mejora al estrellarse un avión en las proximidades y atender al único superviviente, un médico llamado Paul Wilton (Roger Moore).[EN]Raquel Cade (Angie Dickinson) is a missionary nurse who, in 1939, travels to Belgian Congo in order to help Dr. Bikel (Douglas Spencer) in Dibella’s Mission Hospital. Just after her arrival the doctor dies because of a heart attack, and Rachel has to confront the native’s habits and religious beliefs. Colonel Henry Derode (Peter Finch), the detachment commander of the Belgian army, offers her his help to abandon the place, but she does not accept it. Things seem to go wrong, but everything changes when she has to perform an appendicitis surgery on a child. As of that moment, the tribe is divided. Her situation improves when an airplane crashes near there and she assists the only survivor, a doctor called Paul Wilton (Roger Moore)

Measurements On Passive Tunable Optical Filters For DWDM

WFOPC 2002 IEEE/LEOS Workshop on Fibre and Optical Passive Components, University of Glasgow, Scotland, on 5th-6th June 2002.Measurements on a passive optical fibre tunable filter are presented. The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a coupler. The novel filter structure allows planar optical integration for having higher free spectral ranges. Novel and simple design equations for the filter parameters and the tuning process are reported. There is a good agreement between measurements and theory.Universidad Carlos III de MadridPublicad

Tunable Optical Filters Using Compound Ring Resonators for DWDM

The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the same optical path between the signals to be interfered (copropagating and counterpropagating ones). The filter structure allows optical integration for having higher free-spectral ranges. Simple design equations for the filter parameters and the tuning are reported. Measurements on a passive optical fiber tunable filter are presented. There is a good agreement between measurements and theory.Publicad

Enfermedades infecciosas: pediculosis púbica

[ES] La acción se desarrolla durante un fin de semana y sus protagonistas son los Fairchild, Gillian (Julie Andrews) y Harvey (Jack Lemmon). Ella, que es cantante, es el prototipo de mujer fuerte y al comenzar la narración le realizan una biopsia en una cuerda vocal para descartar un cáncer. El es arquitecto, va a celebrar su sesenta aniversario, se da cuenta que ha envejecido y tiene miedo a la muerte

Intertwined magnetooptical and plasmonic properties in magnetoplasmonic multilayers

Comunicación presentada en el 2nd Early Stage Researchers Workshop in Nanoscience, celebrado en Madrid el 28 y 29 de junio de 2012.This work deals with metal and metal-dielectric magnetoplasmonic (MP) multilayers, which combine noble metals and ferromagnetic ones and exhibit interrelated effects between the excitation of Surface Plasmon-Polaritons (SPPs) and their magnetooptical (MO) activity. We have studied the effect of the SPP resonances for the enhancement of the MO activity and the magnetic modulation of the SPP wavevector.Peer Reviewe

New quadrature rules for Bernstein measures on the interval [-1,1]

13 pages, no figures.-- MSC2000 codes: 33C47, 42C05.MR#: MR2480082Zbl#: Zbl pre05602092In the present paper, we obtain quadrature rules for Bernstein measures on [-1, 1], having a fixed number of nodes and weights such that they exactly integrate functions in the linear space of polynomials with real coefficients.The first three authors were partially supported by Ministerio de Educación y Ciencia under grant number MTM2005-01320. The fourth author was partially supported by Ministerio de Educación y Ciencia under grant number MTM2006-13000-C03-02 and project CCG07-UC3M/ESP-3339 with the financial support of Comunidad de Madrid and Universidad Carlos III de Madrid.Publicad

Transcultures and Communities: exercises to validate and design a set of tales on migrations

Comunicación presentada en 5th International Conference of the Association of Architectural Educators, University of Westminster, 24-26 April 2019.Literary studies’ main object of study is the dynamics and devices involved in textual stories. Traditionally, architecture studies design spaces for experiences. It corresponds to sociology studies to reveal the interrelations between humans and their environment. Finally, geopolitical studies classically focus on political powers linked to the geographical space. In this context, this paper presents a multidisciplinary set of exercises that took place during the first semester of the academic year 2018/19, in which these four disciplines shared objectives and methods in relation with a common topic: migrations in the mid-20th Century. These exercises are based on literary narratives and non-literary texts about migration, border-crossing and transcultural identities compiled in the volume Journeys. How travelling fruit, ideas and buildings rearrange our environment (published by the Canadian Centre for Architecture in 2010), acknowledging the value of non-human migrants through topics and stories by establishing complex connections between them. The work presented in this paper describes how students are capable of implementing procedures learnt from other fields of knowledge (e.g. such as storyboards, sociograms or image tagging) for developing a traditional architectural design project. The educational challenge is presented by the definition of methodologies and the identification of statements. The research developed in this contribution focuses on different degrees of integration and rootedness of modern migrations caused by climatic, cultural, labour or economic reasons. Is it a suitable topic for the four disciplines involved? It certainly provides an opportunity to speculate with non-humans, goods and knowledge beyond anthropocentric discourse. In particular, the subject allows us to compare migrants and remittances i.e. non-monetary transfers such as consumer goods, customs and technologies

Infecciones en 35 m/m (2010)

[ES] En el transcurso del año 2010 en el Boletín Mensual de Noticias de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica se analizaron nuevas películas con contenido infeccioso en la sección infecciones en 35 mm. A continuación se relacionan los filmes analizados