FWM: Efeito da Alocação de Canais em Sistemas WDM com Largura de Banda Constante e Grades Ultrafinas (FWM: Effect of Channel Allocation with Constant Bandwidth, and Ultra-fine Grids in DWDM Systems)

José Rodolfo Souza (jrsouza@uerj.br)1, Paula Brandão Harboe (paula@telecom.uff.br)2

1Universidade do Estado do Rio de Janeiro
2Uiversidade Federal Fluminense

This paper appears in: Revista IEEE América Latina

Publication Date: March 2011
Volume: 9,   Issue: 1 
ISSN: 1548-0992

This work investigates how the channel allocation ‑ keeping the system bandwidth constant ‑ affects the penalties imposed by the four-wave mixing mechanism on DWDM (Dense Wavelength Division Multiplexing) systems based on monomode, dispersion-shifted optical fibers (G.653). The FWM power is calculated under the undepleted-pump hypothesis, and is used to evaluate the bit-error rate (BER), which is taken as a measure of the systems performance. Six channel allocation schemes, based on the 100, 50, 25, 12.5, and 6.25 GHz grids. The novel results obtained show how the input power per channel varies as a function of the spectral position, number of channels, length of fiber, and transmission rate; the results indicate that the channel reallocation within the systems bandwidth effectively reduces the penalties imposed by FWM.

Index Terms:
Frequency allocation, bit-error rate (BER), four-wave mixing (FWM), WDM systems.   

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