Subsistemas opticos para comunicação solitonica

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

This work invesligates oplical subsystems that can be used in solitonic communications. Several numerical simulations are presented, using the Mathemalica® programming language. Inilially, the non-linear oplical pulse propagalion is analyzed, using thefinite difference lime domain (FDTD) method. A pair of non-linear Schrõdinger equalions is solved simultaneously to see the condilions for oplical soliton formalion. Both bright and dark solitons were investigated, the later using cross-phase modulation. In a second part, the behavior of oplical amplifiers using doped fibers was studied The computer program developed allows to see the evolulion of the informalion signal, pumping and amplified spontaneous emission (ASE). The program makes the simulalion at a given wavelength (spot analysis) or in a complete spectral range, depending on the data availablefor thefiber. Using the above programs, several devices were analyzed, like a non-linear amplifying loop mirror (NAIM), for regeneralion of exhausted dark solitons, and oplical fiber s loop lasers,for generalion of bright solitons. In this later case, thefree-running and AMmode lockedfiber lasers were invesligated It was shown that the laser signal startfrom the ASE present in the loop. A method for the generalion of a train of short oplical pulses, using the phase modulalion of a CW signal followed by an oplical filtering, was investigated It was observed that the use of a gaussian filter gives a good output signal (close to the soliton shape) and that filters with a periodic transfer funclion (/ike a Fabry-Perot filter) can be used to double thepulse rate obtained using a non-periodicfilter

ASSUNTO(S)

fibras oticas solitons amplificadores oticos otica não-linear

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