Eliminating SRS channel depletion in massive WDM systems via optical filtering techniques

We demonstrate that the channel depletion due to stimulated Raman scatterin g in massive wavelength-division-multiplexed (WDM) systems can be eliminate d using high-frequency pass filters. These filters, when inserted appropria tely into the transmission link, can effectively suppress the SRS power flo w from the WDM channels to lower frequency noise. Numerical simulations tar ried out on WDM systems indicate that the channel depletion penalties can b e kept below 0.25 dB even for a total channel power of 2 W.