We demonstrate a method for all-optical multi-wavelength regeneration based on four-wave mixing. Three wavelength division multiplexed signals, each having a data rate of 10 Gbps and a fixed wavelength spacing of 1 nm, are modulated with a sinusoidal signal of 25 GHz. The resultant sidebands of the modulated signal are filtered at a variable wavelength spacing and combined with a pump signal. The combined signal is passed through a highly non-linear fiber to generate multiple carriers at different wavelengths through four-wave mixing. Filtering the data modulated carriers obtained at the output of the highly non-linear fiber results in signals having lesser noise contribution. Two different optical signal-to-noise ratios (OSNRs) of 16.5 and 19 dB at the input of the regenerator are considered to evaluate the system performance. In both cases, a significant improvement in the bit error rate (BER) of the signals is observed. Simulation results show an average improvement of 2.537 and 1.335 dB in received optical power at BER of ^{10  −  9} in case of 16.5 and 19 dB OSNRs, respectively.