Digital back propagation in optical solitons for pbr reduction

We investigate the use of Digital Back Propagation technique to optical solitons for long distance transmission. An optical solitons pulse has been transmitted over distance of 18,000 km. Results indicate a finite pulse spreading with pulse Broadening Ratio (PBR) of 13. But using Digital back propagation over virtual fiber of 800km before receiver detection helped reduce the PBR to nearly zero