It then analyzes OSNR limitation problem of ultra-long span transmission system and proposes some solutions, including Raman Fiber Amplifier(RFA) and Remote Optically Pumped Amplifier(ROPA).
According to its good characteristics, Raman Fiber Laser (RFL) plays an increasing role in Optical Communication system, Optical Sensing, Eye-safe Lidars, Laser Spectrum and Laser Medicine.