OPTICAL FIBER FOR RAMAN AMPLIFICATION AND RAMAN AMPLIFICATION OPTICAL TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber for Raman amplification improving a signal-to-noise ratio in an optical transmission system using Raman amplification, and also to provide a Raman amplification optical transmission system using the optical fiber for Raman amplification.;SOLUTION: The optical fiber F₂ for Raman amplification has a refractive index distribution that continuously varies along the propagation direction of signal light and having a Raman gain rate continuously varying in the transmission direction. The Raman amplification optical transmission system comprises: the optical fiber F₂ for Raman amplification; a single mode optical fiber F₁ having a refractive index distribution uniform in the propagation direction of signal light; and a Raman excitation light source 3 that is disposed in a rear side of the optical fiber F₂ for Raman amplification with respect to the propagation direction and injects excitation light to the fiber F₂ for Raman amplification, the excitation light propagating in an opposite direction to the propagation direction of the signal light.;COPYRIGHT: (C)2009,JPO&INPIT