FIBER OPTICAL AMPLIFICATION DEVICE

摘要

PURPOSE:To provide a fiber optical amplifier of high saturation output and less noise. CONSTITUTION:A fiber amplifier is constituted by connecting a semiconductor laser source 1 for excitation and a rare earth doped fiber 4 which is doped with Er and Yb through an optical coupler 3. An excitation laser of a wavelength region of 850 to 900nm is used as excitation light. Since Yb has a wide absorption band ranging from 700 to 1150nm and Er is free from excitation state absorption(ESA) ranging from 850 to 980nm, gain can be effectively obtained.