Amplificadores Ãpticos, estudos de polarizaÃÃo e geraÃÃo de pulso usando processos paramÃtricos em fibras Ãpticas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

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 communication speeds. Among these components, one can mention Bragg gratings, filters, couplers, etc., that compose the WDM (Wavelength Division Multiplexing) systems. Semiconductor lasers and modulators complete the group of fundamental devices of the communication systems. This leads communications to advance to frequency bands beyond the optical telecommunications conventional band (C band (1530 − 1560 nm)), mainly to the S (1470 − 1530 nm) and L (1560 − 1630 nm) bands. In this thesis, we show a series of works that aims at to theoretical and experimental studies of nonlinear optical effects in fiber, giving emphasis to: the development of fiber amplifiers and wavelength converters for use in the C, S and L bands; the generation of a high-repetition-rate train of ultra-short pulses and its simultaneous wavelength conversion; the generation of optical signal copies with different polarizations for use in optical telecommunications. The experimental setups were built with fiber-integrated devices. Here, the main nonlinear optical effects exploited are four wave mixing, Raman amplification, optical amplification based on stimulated emission of rare-earth ions (Er3+ and Tm3+). The obtained results include: the development of a fiber optical parametric amplifier (FOPA) and wavelength converter assisted by an external counter-propagating Raman pump, resulting in amplification in the C and S bands and in signal conversion from C to S and from S to C bands; the implementation of the association of amplifiers in series using erbium- or thulium-doped fiber optical amplifier (EDFA or TDFA) followed by a FOPA, for amplification in the C and L or S and C bands and wavelength conversion from the C and L bands to the S band or from the S and C bands to the L band, respectively; demonstrations of use of the parametric process for short pulse (0.5 ps) generation and frequency conversion at a high rate (170 GHz) in the C band; the generation, via parametric process, and demultiplexing of signal copies for use in WDM telecommunication systems; the study of the effects of signal polarization change in presence of parametric amplification

ASSUNTO(S)

Ãptica nÃo linear fibras Ãpticas fisica Ãptica optical optical amplifier optical fiber nonlinear optics amplificaÃÃo Ãptico

ACESSO AO ARTIGO

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