A simple analytical expression for the optical signal-to-noise ratio (SNR) benefit expected from adding forward Raman gain to backward Raman gain in a fiber transmission span is derived. This result is then applied to modify the stimulated Brillouin scattering (SBS) threshold for the case of a signal experiencing forward Raman gain. These concepts are applied to demonstrate repeaterless transmission of 10 and 40 Gb/s data rates over standard single mode fiber (SSMF).
© 2005 IEEE
A. P. Küng, A. Agarwal, D. F. Grosz, S. Banerjee, and D. N. Maywar, "Analytical Solution of Transmission Performance Improvement in Fiber Spans With Forward Raman Gain and Its Application to Repeaterless Systems," J. Lightwave Technol. 23, 1182- (2005)