OPTICAL TRANSMISSION LINE, METHOD FOR MANUFACTURING OPTICAL TRANSMISSION LINE, AND OPTICAL TRANSMISSION SYSTEM

摘要

An optical transmission line for Raman-amplifying an optical signal by supplying pumping light. A range where the Raman gain coefficient takes on a maximum is a predetermined distance away from the end where the pumping ligh t is supplied in the direction of the propagation of the pumping light. The power of the optical signal does not increase to the extent that the optical Kerr effect becomes remarkable at any point of the optical transmission line , does not decrease to the extent that the SN ratio remarkably lowers, and is ensured to have a large value at the end of the transmission line. A method for manufacturing the optical transmission line and an optical transmission system comprising the optical transmission line are also disclosed.