Optical transmission system for Raman amplified signal light transmission, sets hybrid transmission path based on distribution of pumping light from common Raman amplifier to transmission units

摘要

Each upstream and downstream signal line has multiple transmission units comprising a hybrid transmission path (HTP) (10N,10P) formed by connecting negative and positive dispersion fibers (11N,12N,11P,12P), respectively. Based on the distribution of pumping light from a common Raman amplifier to the transmission units, the HTP is set so as to reduce a difference in Raman gain between each transmission unit.