Erbium-doped fiber amplifiersEDFAs are very attractive devices for single-mode fiber communication systems operating In the 1.55 p m wavelength band. 1 The main advantages of EDFAs are polarization-Insensitive high gain, high amplification efficiency, low Insertion loss, low noise and wide bandwidth. 2 There are two Important parameters to evaluate EDFAs performance an energy conversion efficiency and a gain coefficient. In this paper, we report an extremely high efficiency EDFA with a slope efficiency of 86 and a gain coefficient of 6.3dBmW at 1.48 p m by increasing the numerical apertureNA of the erbium-doped fiber and concentrating the dope Er3 Ions near the center of the core. 3 4 Both are the highest values reported to-date for EDFAs pumped at 1.48 um.
This article is from 'OSA Proceedings of the Topical Meeting on Optical Amplifiers and their Applications Held in Snowmass Village, Colorado on 24-26 July 1991. Volume 13,' AD-A252 974, p166 thru p169.