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Strain and Temperature Characterization of LPGs Written by CO2 Laser in Pure Silica LMA Photonic Crystal Fibers

Photonic Sensors 2015年第3期5卷 241-250页

作者： Roberta Cardoso CHAVES Alexandre de Almeida Prado POHL Ilda ABE Renan SEBEM Aleksander PATERNO laboratorio avangado de telecomunicacoes Federal University of Technology Parancl Brazil laboratorio de Fot6nica Federal University of Technology Parana Brazil Laboratory of Optoeleetronic Systems Santa Catarina State University Santa Catarina Brazil

This paper reports on the writing of long period gratings （LPGs） in a six-ring pure silica solid core, and large mode area photonic crystal fiber （fiber core diameter p = 10.1 μm） using a CO2 laser system, and the characterization of their strain and temperature sensitivities. Temperature and strain sensitivities in the order of-19.6pm/℃ and -88 pm/με, respectively, were obtained, which were comparable or surpassed values of the similar photonic crystal fiber （PCF）-based LPG or sensor configurations found in the literature.

关键词： Long period grating photonic crystal fiber CO2 laser

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Optical Bistability in an Acousto-Optic Tunable Filter(AOTF)Operating with Short Optical Pulses

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Journal of Electromagnetic Analysis and Applications 2012年第3期4卷 112-117页

作者： Karlo David Alves Saboia Alex Sander Barros Queiroz Francisco Tiago Lima Cicero Saraiva Sobrinho Jose Wally Mendonca Menezes Antonio Sergio Bezerra Sombra departamento de Fisica Laboratorio de Telecomunicacoes e Ciencia e Engenharia de Materiais(LOCEM)Universidade Federal do CearaFortalezaBrazil Faculdade de Educacao de Crateus-Universidade Estadual do Ceara CrateusBrazil departamento de Teleinformatica Laboratorio Especialista em Sistemas de Telecomunicacoes e Ensino(LESTE)Instituto Federal do Ceara(IFCE)Campus FortalezaFortalezaBrazil

In this paper we report for the first time the presence of bistability in an acoustic-optic tunable filter (AOTF) operating with ultrashort (2 ps) optical light pulses. The results for the study of bistability has shown the dependence of the hysteresis curve with the product of the coupling constant (κ) by the length of the device (ξL) and the conversion power-coupling constant factor (G). The range of bistability varies significantly with both G and with κξL parameters. The variation of κξL directly increases the size of the range of bistability hysteresis while the increase in G causes the bistability to occur at low powers. The phenomenon of optical bistability (OB) is the object of increasing interest due to its possibilities for important device applications. A bistable device is a device with a capability to generate two different outputs for a given input and the physical requirements for this are an intensity-dependence refractive index and an optical feedback mechanism.

关键词： Bistability Acousto-Optic Tunable Filter

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Analysis of the Performance of Optical Code-Division Multiple-Access System(OCDMA),Operating with Gold Codes under Nonlinear Effects

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Journal of Electromagnetic Analysis and Applications 2013年第2期5卷 49-57页

作者： Glendo de Freitas Guimaraes Agliberto Melo Bastos Alisson da Conceicao Ferreira Alex Sander Barros Queiroz Jose Wally Mendonca Menezes Jose Rubens Rodrigues de Sousa Antonio Sergio Bezerra Sombra laboratorio de telecomunicacoes e Ciencia e Engenharia dos Materiais(LOCEM) Departamento de FisicaUniversidade Federal do Ceara(UFC)FortalezaBrazil laboratorio Especializado em Sistema de telecomunicacoes e Ensino(LESTE) Departamento de TelematicaInstituto Federal do Ceara(IFCE)Campus FortalezaFortalezaBrazil Grupo de Fisica Aplicada e Docencia(GFAD) Instituto Federal do Ceara(IFCE)Campus SobralSobralBrazil departamento de Engenharia de Teleinformatica(deTI) Centro de TecnologiaUniversidade Federal do Ceara(UFC)FortalezaBrazil departamento de Engenharia de Energias Universidade da Integracao Internacional da Lusofonia Afro-Brasileira(UNILAB)RedencaoBrazil

A numerical simulation study of the performance of encoding and decoding of short optical pulse in OCDMA (Optical Code Division Multiple Access) systems under non-linear optical effects is presented. The performance of encoding and decoding short pulses is obtained through use of device FBG (fiber Bragg grating) where the codes are inserted through discrete jumps in the optical phase (±π). The multiuser interference is also the object of the present study, where a figure of merit (interference figure) is used to quantify the interference in multiuser auto and cross correlation. We evaluate the dependence of the multiuser interference for the coupling constant of FBG. Finally, the interference inserted in the autocorrelation due to nonlinear effects generated in the nonlinear switching of the coded pulse in a dual core nonlinear directional coupler is examined, where temporal broadening of pulses decoded is observed.

关键词： Fiber Bragg Grating Gold Code OCDMA All-Optical Digital Processing of Signals

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