Abstract
A numerical investigation into the propagation of ultrashort light pulses in the region of 1.55 µm was conducted and the conversion efficiency (CE) in four-wave mixing (FWM) generation of ordinary and dispersion decreasing fibres for use in wavelength division multiplexing (WDM) systems was investigated. The simulation studied six different profiles: linear, hyperbolic, Gaussian, logarithm, exponential and constant. For all the studied profiles there was a decrease in conversion efficiency with an increase in channel separation. The CE for the hyperbolic profile is around 103 times larger in magnitude compared with the constant, logarithm and linear profiles at 0.2 nm. Modulation instability was observed during the FWM signal propagation. Typically, a frequency of modulation Δ fMAX≃8 GHz at the beginning of the propagation of the mixing signal (15 km) was obtained. For the Gaussian profile, where the modulation instability (MI) is more efficient, and for a long propagation, the MI is growing and more frequency satellites are present. It is concluded that with the use of decreasing dispersion profile (DDF) fibres, control of the CE and the compression factor of FWM generation in WDM systems can be achieved.
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