Transmissão 4×40 Gb/s por Diferentes Tipos de Fibras e Resíduos de Dispersão com Aproveitamento do Legado Tecnológico de 10 Gb/s (Transmission of 4×40 Gb/s Using Different Optical Fiber Links and Residual Dispersions for the Upgrading of 10 Gb/s Technology Legacy)

Mario Tosi Furtado (, Mônica de Lacerda Rocha (, Mariza Rodriguez Horiuchi (, Miriam Regina Xavier de Barros (, Sandro Marcelo Rossi (, Fabio Donati Simões (, Roberto Arradi (

Fundação CPqD, Campinas - SP, Brazil.
This paper appears in: Revista IEEE América Latina

Publication Date: Oct. 2005
Volume: 3,   Issue: 4 
ISSN: 1548-0992

We investigated the transmission of 4 WDM channels at 40 Gb/s, through different optical links of approximate equal lengths, around 50 km, but with different residual dispersions produced by various types of fibers, G. 652 (STD) + DCF (dispersion compensating fiber), G. 653 (DS) and G. 655 (NZD+). The experimental setup includes components usually employed in laboratory characterizations of WDM transmission systems at 10 Gb/s. The optical system behavior is analyzed theoretically and experimentally with bit-error-rate (BER) measurements at 40 Gb/s, in the back to back configuration and transmitted trough different optical fiber links. The results show the generation of BER floor by spontaneous emission and phase-intensity noises, as well as by the chirp of the external modulator at the transmitter. Different approaches are discussed to upgrade the 10 Gb/s legacy, and to prevent the combination of chromatic dispersion effects, that produce severe penalties in WDM transmissions at 40 Gb/s.

Index Terms:
Chirp, optical communications, chromatic dispersion, phase intensity noise, WDM transmission, 40 Gb/s.   

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