Análisis de la expansión de redes de acceso pasivas de fibra óptica gpon y bpon en la ciudad de Medellín

En este trabajo se reporta un análisis de la expansión de Redes de Acceso Pasivas de Fibra Óptica a partir de mediciones de potencia óptica y de reflectometría en el dominio del tiempo en una red instalada en la ciudad de Medellín. Se hizo el análisis entre uno de los usuarios de la red y la Oficina Central a una distancia de 1,2 km, y se encontró una potencia en la terminal de red óptica de -18,8 dBm que es adecuada para los servicios demandados por el usuario. Para la migración a nuevas tecnologías de transmisión en Redes de Acceso Pasivas se recomienda el análisis de la atenuación espectral en la fibra instalada, el cambio en la razón de división de potencia (split ratio) de los divisores ópticos y el ajuste de niveles de potencia en las terminales ópticas de red, con el fin de permitir la expansión gradual para nuevas instalaciones de usuarios desde la Oficina Central. Se propone el análisis de implementación de otras topologías con el fin de potencializar el crecimiento y la adopción gradual de nuevas tecnologías como las Redes Pasivas Multiplexadas por longitud de Onda.In this work, we present an analysis of the Optical Passive Fiber Network by measurement of optical power and Optical Reflectometry in the time domine on a network installed in Medellín city. We made the analysis between one network´s user and Central Office at 1,2 km of distance and -18,8 dBm of optical power was measured. This value is adequate for user service demanded. For new technology migration in Passive Optical Network the analysis of spectral attenuation over installed fiber, the change in splitter ratio and adjust of optical power are recommended. This analysis will allow the gradual expansion for news installation of users from the Central Office. This analysis is a proposal for topology implementation caused by the growth and new technology adoption such as passive wavelength multiplexing.optical network

Análisis de la transmisión de tramas STM-N sobre un enlace de fibra óptica DWDM

En este trabajo se presenta un análisis del desempeño de la capa física de un enlace DWDM de 66 km de fibra óptica monomodo sobre la cual se implementa un sistema SDH para envío de módulos STM-1 a 155 Mbps. Se muestran los resultados de la simulación computacional en Optisystem 7.0 (Versión Evaluación) para analizar las características de un sistema DWDM a una velocidad de 2.5 Gbps equivalente al envío de módulos STM-16. Los resultados de diagramas de ojo y BER muestran que es posible la distinción entre bits cuando el ruido térmico en el detector es inferior a 1x10-19 W/Hz. Se analizan mediciones experimentales de Jitter y su correspondiente comparación con el valor normatizado por la ITU-T para módulos STM-1. Se propone el uso de más longitudes de onda para aprovechar al máximo la capacidad de transmisión de la fibra o la instalación de interfaces de mayor velocidad en los extremos del enlace para el incremento del ancho de banda disponible.In this work, we present an analysis of physical layer performance of a DWDM-link of 66 km of single-mode optical fiber on which is implemented a SDH system to send STM-1 at 155 Mbps. We show the computational simulation in Optisystem 7.0 (Evaluation Version) to analyze the DWDM system characteristic at 2.5 Gbps equivalent to a STM-16 frame. The results of the eye diagram and BER show that is possible to distinguish between bits when the detector thermal-noise is less than 1x10-19W/Hz. We analyze experimental measurements of jitter and its corresponding comparison with the value normalized by the ITU-T for a STM-1 frame. The use of more wavelengths is proposed to maximize the transmission capacity of fiber optics or installation of interfaces with high capacity for increasing the available bandwidth

Novel Bending Loss Reduction Technique For The Tm Mode In Soi-based Waveguides

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)A new approach to reduce the bending loss of the fundamental quasi-transverse magnetic mode in optical waveguides is presented. A much lower bending loss is achieved by designing waveguides that use as substrate or cladding an anisotropic metamaterial made of multilayers of thin films of germanium and porous silica instead of a conventional silica substrate or cladding. We numerically demonstrate a reduction in the bending loss of up to similar to 3 dB/90 degrees for a silicon-on-insulator (SOI) waveguide of the standard core size (500x220 nm), as well as, up to similar to 10 dB/90 degrees for a sub-wavelength SOI waveguide of core size (372x186 nm), even considering the high absorption of the germanium layers in the cladding, both designed to operate at 1550 nm.288872875Brazilian C&T Institute FOTONICOM through National Council of Technological and Scientific Development [574017/2008-9]Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2008/57857-2]Colombian Agency Enlaza MundosBrazilian Agency Coordenacao de Aperfeicoamento de Pessoal de Nivel SuperiorFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Vortex Polymer Optical Fiber with 64 Stable OAM States

This research introduces a numerical design of an air-core vortex polymer optical fiber in cyclic transparent optical polymer (CYTOP) that propagates 32 orbital angular momentum (OAM) modes, i.e., it may support up to 64 stable OAM-states considering left- and right-handed circular polarizations. This fiber seeks to be an alternative to increase the capacity of short-range optical communication systems multiplexed by modes, in agreement with the high demand of low-cost, insensitive-to-bending and easy-to-handle fibers similar to others optical fibers fabricated in polymers. This novel fiber possesses unique characteristics: a diameter of 50 µm that would allow a high mechanical compatibility with commercially available polymer optical fibers, a difference of effective index between neighbor OAM modes of around 10−4 over a bandwidth from 1 to 1.6 µm, propagation losses of approximately 15 × 10−3 dB/m for all OAM modes, and a very low dispersion for OAM higher order modes (±l = 16) of up to +2.5 ps/km-nm compared with OAM lower order modes at a telecom wavelength of 1.3 µm, in which the CYTOP exhibits a minimal attenuation. The spectra of mutual coupling coefficients between modes are computed considering small bends of up to 3 cm of radius and slight ellipticity in the ring of up to 5%. Results show lower-charge weights for higher order OAM modes

Ultra-broadband two-pump optical parametric amplifier in tellurite waveguides with engineered dispersion

The capacity of communication networks may be significantly improved by simply enhancing the optical amplifier bandwidth. This paper presents a numerical investigation of an ultra-broadband, low-ripple, two-pump-optical parametric amplifier (2P-OPA) that employs a tellurite glass buried-channel type nano-waveguide as nonlinear medium. The nano-waveguide was designed as a 25-cm-long Archimedean spiral that occupies a footprint of only similar to 2.5 mm(2), with a similar to 0.7 mu m(2) effective cross section. Its zero-dispersion wavelength is similar to 1550 nm, the nonlinear coefficient is similar to 3000 W-1 km(-1), and the attenuation coefficient is similar to 0.5 dB/m (1100 to 1900 nm). Simulations suggest a 2P-OPA based on such waveguide will be able to amplify 243 QPSK input channels modulated at 56 Gbps over 102 nm bandwidth, over metropolitan area network scales25442684283CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP574017/2008-9; 311137/2014-8; 311870/2014-72008/57857-