Optical Fiber Polarization
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Theoretical and experimental comparison between power and degree of polarization based optical fiber current sensors
This paper presents a theoretical and experimental comparison of two techniques of optical fiber current sensors (OFCS) based on the Faraday Effect: the power and the degree of polarization (DOP) methods. The DOP method is shown to be insensitive to state of polarization (SOP) changes induced by environmental conditions. A maximum variation of 0.4% in the DO
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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2. Nonlinear effects compensation in Optical Coherent PDM-QPSK Systems
Nonlinear effects has been appointed as the main limitation in coherent optical fiber transmission. Digital Back-Propagation algorithms and Maximum Likelihood Sequence Estimation are two of the current studied methods to cope with such impairment and extend the systems maximum reach. In this article, we analyzed both methods in a 112 Gb/s Dual Polarization Q
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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3. Algoritmos RWA para redes ópticas transparentes considerando limitações da camada física / RWA algorithms for optical transparent networks considering physical impairments
With the proliferation of new multimedia services such as VoIP and IP-TV, an increasing demand for high rates of data transfer is being seen. Thus, the demand on the core of the network is continuously growing, so its capacity must increase in the same ratio to provide a reliable service to end users. The Transparent Optical Networks with WDM appears as a so
Publicado em: 2010
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4. POLARIZATION OF LIGHT CONTROL IN MONOMODE OPTICAL FIBERS AND APLICATIONS / CONTROLE DA POLARIZAÇÃO DA LUZ EM FIBRAS ÓPTICAS MONOMODO E APLICAÇÕES
The control of polarization state, as well as a control of all states of polarization of a light signal travelling through a singlemode optical fiber, is performed using different schemes. The polarization control of the signal in a DWDM channel is performed using reference signals in lateral channels in real time. A polarization encoded quantum key distribu
Publicado em: 2009
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5. Estudo da estabilidade do acoplamento de modos de um laser a fibra dopada com érbio com pulsos de femtossegundos e taxa de 10 GHz
In this work we show a study of mode-locking stabilization in an Erbium doped fiber laser with assynchronous mode-locking generating ultra-short pulses at the rate of 10 GHz. The fiber effects are presented as well as the mode-locking techniques. Also is presented a study of energy pulse stabilization, frequency and cavity, in addition an overview of stabili
Publicado em: 2009
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6. Amplificadores Ãpticos, estudos de polarizaÃÃo e geraÃÃo de pulso usando processos paramÃtricos em fibras Ãpticas
The recent telecommunication development can be, to a large extent, attributed to the capacity of transmitting information (video, sound and data) at high transmission rates (Tbits/s) through the optical fiber. The constant advances in the technological development of active and passive devices based on optical fibers have enabled a steady increase in commun
Publicado em: 2007
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7. Systemic analysis of noise penalties all-optical network / AnÃlise sistÃmica das penalidades de ruÃdo nas redes Ãpticas transparentes
In this thesis, the routing and wavelength assignment processes are addressed. Besides of considering the network layer resources (number of available wavelengths in a link), the impact of physical layer effects in the transmitted optical signals is analyzed for both processes. The optimization of the wavelength assignment process is obtained by minimizing t
Publicado em: 2007
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8. The characterization of step index single mode silica fiber for long haul signal communication
The optical properties of single mode fibers, which are drawn from the silica preform made by MCVD technique, have been studied. The properties such as cutoff wavelength, chromatic dispersion, and polarization mode dispersion (PMD) were studied for 2.3 km length of single mode fiber (SMF). The cutoff wavelength was measured by fiber optic test procedure (FOT
Materials Research. Publicado em: 2005-09
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9. EFEITOS DA POLARIZAÇÃO DA LUZ EM SISTEMAS DE COMUNICAÇÕES POR FIBRA ÓPTICA / POLARIZATION EFFECTS IN OPTICAL FIBER COMMUNICATIONS SYSTEMS
The polarization effects that cause limitations in optical communications are essentially the Polarization Mode Dispersion (PMD), the Polarization Dependent Loss (PDL), and the Polarization Dependent Gain (PDG). These effects can appear either isolated or in combinations, generating signal distortion. These effects were first investigated individually under
Publicado em: 2005
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10. POLARIZAÇÃO ELETROTÉRMICA DE VIDROS E FIBRAS ÓPTICAS / GLASS AND OPTICAL FIBER ELECTROTHERMAL POLING
Over the past few years, there has been a growing demand for optical components for telecommunication systems. In order to increase the efficiency of these components, reduce costs and allow integration to current systems, efforts have been made in researching new materials, for example, silica. Due to its isotropic nature, silica, ordinarily, does not prese
Publicado em: 2005
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11. UM POLARÍMETRO DE BAIXO CUSTO / A POLARIMETER OF LOW COST
A new polarimeter model, based on time-varying birefringence caused by piezoelectric-controlled fiber- squeezing plates, is presented and constructed. The device is based on time division of the light signal and, in comparison with other polarimeters of its kind, features many advantages, like low cost and simplicity. The results given by the new polarimeter
Publicado em: 2003
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12. On the study of the nonlinear effects of both Self-Phase and Cross-Phase Modulation in optical fibers / Estudo dos Efeitos Não Lineares de Automodulação de Fase e Modulação de Fase Cruzada em Fibras Ópticas
In this work some phenomena that occur during the propagation of pulses of light in optical fibers [1], [7], [13], [16], [18], [20], [21], [22], [24], [25], [59] e [60] are studied. The study is based on the Nonlinear Schrödinger Equation (NLS), gotten in Chapter 2 from the equations of Maxwell, considering a nonlinear susceptibility. The adopted mathematic
Publicado em: 2003