Analysis the Performance of Coded WSK-DWDM Transmission System

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Author(s) Bobby Barua
Pages 1974-1983
Volume 2
Issue 12
Date December, 2012
Keywords Dense Wavelength Division Multiplexing (DWDM); four-wave mixing (FWM); dispersion shifted fiber (DSF; signal to noise ratio (SNR); bit error rate (BER); Multiple Ary(M-ary).
Abstract

Dense Wavelength Division Multiplexing (DWDM) is the system with more than eight active wavelengths per fiber. Again high data rates as well as long spans between amplifiers in a chain require high optical power per channel to satisfy the signal to noise ratio (SNR) requirements. So the DWDM systems with long repeater-less spans, the simultaneous requirements of high launched power and low dispersion fibers lead to the generation of new waves by four-wave mixing (FWM), which degrades the performance of a multi-channel transmission system. Several methods have been proposed to mitigate the effect of FWM crosstalk. All these works are performed considering only binary WSK scheme. Although M-ary WSK (M>2) schemes have higher spectral efficiency than binary WSK system. Again, the BER performances for M-ary WDM system are not satisfactory with the effect of FWM. Therefore, in this paper we include the effect of FWM on the performance of an M-ary WDM system and try to mitigate the effect by employing the energy efficient convolution code in a normal dispersive fiber as well as in a dispersion shifted fiber (DSF).

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