The steady SRS analysis theory of DWDM transmission system in single-mode silica fiber

• The formal solution for the couple equations of the SRS with different loss coefficients in DWDM system was given.
• Proposed a novel algorithm, and verified its correctness by showing that the curves for them are basically in coincidence.
• α¯(z) defined as equivalent attenuation coefficient was discussed.

The formal solution for the couple equations of the stimulated Raman scattering (SRS) with different loss coefficients in the DWDM transmission system was discussed. The variation of each signal photon flux along the transmission distance is shown clearly by the formal solution. Then, the analytical solution is obtained from the formal solution when the loss coefficient is the same. Simultaneously, the analytical solution of the small-signal model is derived, too. We also proposed a novel algorithm according to the formal solution, and verified its correctness by showing that the curves for them are basically in coincidence. The result has a certain significance for study on DWDM transmission system and Raman fiber amplifier.