Submarine Optical Fiber Cable for Repeaterless Transmission Systems Employing Remotely Pumped EDF and Distributed Raman Amplification

摘要

We developed a submarine optical fiber cable for a repeaterless transmission system with remotely pumped erbium doped fiber (EDF) amplification and backward Raman amplification. We clarified the required optical fiber characteristics for a long-distance repeaterless transmission system designed to exceed 370 km at 2.5 Gbit/s. We examined various types of standardized fiber in terms of optical loss and Raman gain characteristics, and selected the most suitable. We then used this fiber in 6-fiber units to manufacture a submarine optical fiber cable, and examined the stability of the optical loss and Raman gain characteristics. We confirmed that the manufactured cable has stable characteristics, and is applicable to long-distance transmission with remote pumping systems.