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 (furtado@cpqd.com.br), Mônica de Lacerda Rocha (monica@cpqd.com.br), Mariza Rodriguez Horiuchi (mariza@cpqd.com.br), Miriam Regina Xavier de Barros (mbarros@cpqd.com.br), Sandro Marcelo Rossi (sandro@cpqd.com.br), Fabio Donati Simões (fsimoes@cpqd.com.br), Roberto Arradi (arradi@cpqd.com.br)


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

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


Abstract:
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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