José Edimar Barbosa Oliveira

Instituto Tecnológico de Aeronáutica (ITA), São José dos Campos, São Paulo, Brazil

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Publications (12)4.13 Total impact

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    ABSTRACT: We experimentally investigate the spectral behavior of electromagnetic radiation absorbing material (RAM) between 350 and 1500nm. Based on laboratories radiometric techniques was showed a good performance of it on camouflage capabilities.
    Latin America Optics & Photonics Conference, Cancún, México; 11/2014
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    ABSTRACT: This paper addresses the subject of optical fiber chromatic dispersion effect on the performance of a long-haul analog photonic link for RF and microwave signals transmission. An intensity modulation and direct-detection link model by using a dual-drive Mach-Zehnder modulator and a fotodetector is presented. The binary phase shift keying technique is used to modulate the RF carrier with 1Gbit/s and this signal modulates the optical carrier. An exact frequency domain analytical model is emphasized. The performance of an analog optical modulation with double and single sidebands are evaluated through eye diagram by using numerical simulations with OptiSystem software.
    Revista Telecomunicações. 11/2014; 16(2):27-35.
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    Nelson Alex Roso, José Edimar Barbosa Oliveira
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    ABSTRACT: A importância da normatização na fabricação e utilização dos equipamentos laser representa para o Brasil, assim como para as Forças Armadas, um grande passo para a criação de procedimentos de segurança aos trabalhadores ou militares envolvidos no manuseio e operação laser. Nesse contexto, o presente trabalho mostra como resultado uma pesquisa bibliográfica, a qual objetiva a apresentação da padronização utilizada internacionalmente na classificação de equipamentos laser, os riscos a que estão sujeitos aqueles que os operam e as consequentes medidas que devem ser adotadas para evitar a exposição à radiação emitida pelos mesmos.É constatada a premente necessidade de se criar normas nacionais que possam orientar a fabricação e a operação laser, nas quais sejam abordados os aspectos essenciais de segurança.
    Spectrum (Brasília, BR). 09/2014; 17(ISSN 1981-4291):46.
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    Nelson Alex Roso, Romero da Costa Moreira, José Edimar Barbosa Oliveira
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    ABSTRACT: The operational implications of high power laser weapons are constantly growing in countries with advanced military technological level. As well as on progress in integration with air, land and naval platforms, this paper discusses the necessary development and implementation of the operational concepts into Armed Forces, which should target orientation in the improvement process of the appropriate warfare material, i.e. the laser, as well as remodeling the existing combat's doctrine. Finally, we highlight some capabilities and limitations inherent in the technology of lasers and present some applications in defense and attack operations enabled by the implementation of laser weapons.
    Journal of Aerospace and Technology Management, São José dos Campos; 06/2014
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    Nelson Alex Roso, Romero da Costa Moreira, José Edimar Barbosa Oliveira
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    ABSTRACT: As implicações operacionais das armas a laser de alta potência estão em constante crescimento nos países com nível tecnológico avançado. Discorrendo inicialmente sobre este aspecto, assim como sobre o progresso da integração nas plataformas aéreas, terrestres e navais, esse artigo aborda a necessidade da criação dos conceitos operacionais pelas Forças Armadas (FA), objetivando orientar o processo de desenvolvimento apropriado do material bélico, isto é, do laser, assim como remodelar a doutrina de emprego existente. Por fim, são destacadas algumas capacidades e limitações inerentes à tecnologia dos lasers, bem como apresentadas algumas aplicações em operações de ataque e defesa possibilitadas pela implementação desse tipo de arma.
    SPECTRUM (Brasília, DF). 10/2013; 16:36-42.
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    ABSTRACT: This paper addresses the subject of fiber optic chromatic dispersion effect on the performance of analog optical link with dual-drive electro-optic Mach-Zehnder modulator, aiming at aerospace applications. Thus, a direct detection link model that emphasizes both the modulator electronic drive and the dispersion characteristic of a linear optical fiber is discussed. Furthermore, a mathematical approach yielding a rather insightful analysis of the link performance for either optical double or single sideband modulation formats is fully discussed. It is worthwhile to point out that such modeling has the special feature of relying on a uniform nomenclature, which enables one to quickly retrieve a wide range of known results regarding optical fiber link performance that are already available on an ample literature. The model usefulness is illustrated by predicting the performance dependence of a direct detection fiber optic link with respect to the radiofrequency and link length. Results of numerical simulations for a link that comprises commercial optoelectronic components with potential for practical application on electronic warfare field were also provided.
    Journal of Aerospace Technology and Management. 06/2013; 5(2):205-216.
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    ABSTRACT: This paper addresses the subject of fiber optic chromatic dispersion effect on the performance of an analog optical link, in which an intermediate frequency signal direct modulates a laser and by using a dual-drive electrooptic Mach-Zehnder modulator a radio-frequency up-conversion is achieved. To this aim, a direct detection link model which emphasizes both the modulator electronic drive and the dispersion characteristic of a linear optical fiber is discussed. With Mach-Zehnder modulator biased at the nonlinear points, the effect of chromatic dispersion on the detected electrical power may be mitigated with the optical bandwidth increasing. Furthermore, an exact frequency domain analytical model which yields a rather insightful analysis of the link performance is discussed. It is worthwhile to point out that such modeling has the special feature of relying on a uniform nomenclature which enables one to quickly retrieve a wide range of known results regarding to optical fiber link performance. The model usefulness is illustrated by predicting the dependence of the performance of a direct detection fiber optic link with respect to the RF frequency and link length. Some preliminary results of numerical simulations for a link which comprises commercial optoelectronic components and has potential for practical applications are given.
    International Workshop on Telecommunications – IWT; 05/2013
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    ABSTRACT: This paper addresses the subject of fiber optic chromatic dispersion effect on the performance of analog optical link with dual-drive electrooptic Mach-Zehnder modulator. To this aim a direct detection link model which emphasizes both the modulator electronic drive and the dispersion characteristic of a linear optical fiber is discussed. Furthermore, a mathematical approach which yields a rather insightful analysis of the link performance for either ODSB or OSSB optical modulation formats is fully discussed. It is worthwhile to point out that such modeling has the special feature of relying on a uniform nomenclature which enables one to quickly retrieve a wide range of known results regarding to optical fiber link performance, which are already available on a rather ample literature. The model usefulness is illustrated by predicting the dependence of the performance of a direct detection fiber optic link with respect to the RF frequency and link length. Results of numerical simulations for a link which comprises state of the art optoelectronic components and has potential for practical application on electronic warfare field are given.
    Simpósio de Aplicações Operacionais em Áreas de Defesa – XIV SIGE; 09/2012
  • William Fegadolli, José Edimar Barbosa Oliveira, Vilson R. Almeida
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    ABSTRACT: The distortion introduced by a ring resonator modulator (RRM) on an optical link is analyzed and modeled in terms of the design parameters of the device.The results show that the RRM can help suppress the third-order intermodulation, allowing for achieving a high spurious free dynamic range (SFDR) of about 126 dB Hz4/5 with respect to the limiting spur. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2375–2378, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26253
    Microwave and Optical Technology Letters 07/2011; 53(10):2375 - 2378. · 0.59 Impact Factor
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    William S Fegadolli, Vilson R Almeida, José Edimar Barbosa Oliveira
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    ABSTRACT: A novel tunable and reconfigurable thermo-optical device is theoretically proposed and analyzed in this paper. The device is designed to be entirely compatible with CMOS process and to work as a thermo-optical filter or modulator. Numerical results, made by means of analytical and Finite-Difference Time-Domain (FDTD) methods, show that a compact device enables a broad bandwidth operation, of up to 830 GHz, which allows the device to work under a large temperature variation, of up to 96 K.
    Optics Express 06/2011; 19(13):12727-39. · 3.55 Impact Factor
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    ABSTRACT: Recently, Gires-Tournois's interferometer (GTI) relying on electrooptic materials have been attracting great interest because they may enable high linear dynamic range optical modulators. Therefore GTI's may play a major role on the subject of signal processing in the field of microwave photonics. This paper addresses the modeling of a novel birefringent GTI modulator set - up as a double ring assisted Mach-Zehnder modulator (RAMZI). The modeling takes into account the front surface mirror reflectance and reveals that GTI based modulators may yield a dynamic range as high as that achieved with RAMZI, with requires a rather more complex fabrication technology. Results of numerical simulations obtained with a GTI configuration which relies on lithium niobate (LiNbO3) and enables a push-pull operation with a single voltage source are presented.
    10/2007;
  • José Edimar Barbosa Oliveira
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    ABSTRACT: Recently, optical modulators based on the Gires -Tournois interferometer (GTI), made of electrooptic materials, have attracted great interest because they may yield high linear dynamic range, hence play a significant role on the subject of signal processing in the field of microwave photonics, especially when applied in the field of electronic warfare receivers. This paper presents the modeling of a novel birefringent GTI modulator, which takes into account the front surface mirror reflectance, as a double ring assisted Mach-Zehnder modulator (RAMZI). Despites its rather reduced fabrication complexity, it is shown that a GTI modulator yields a dynamic range as high as that achieved with a mach more cumbersome RAMZI structure. Results of numerical simulations obtained with a Lithium Niobate (LiNbO 3) GTI which enables a push-pull operation with a single voltage source, are presented.