Title :
Analysis of optical gain enhanced erbium-doped fiber amplifiers using optical filters
Author :
Yu, A. ; O´Mahony, M.J. ; Siddiqui, A.S.
Author_Institution :
Dept. of Electron. Syst. Eng., Essex Univ., Colchester, UK
fDate :
7/1/1993 12:00:00 AM
Abstract :
Erbium-doped fiber amplifiers (EDFAs) with enhanced optical gain obtained by incorporating narrow-bandpass optical filters into the amplifier length are studied. It is shown in theory that it is possible to increase optical gain by more than 10 dB for optical signals around the wavelength of 1.55 mu m, compared with conventional EDFAs without filters. It is also shown that the gain improvement at longer wavelengths away from the amplifier gain peak is much higher than that of the EDFA with an optical isolator within the amplifier length. The optimum filter position is found to be around 42% of the total amplifier length from the input end. The effects of filter insertion loss and pump loss are discussed. This amplifier can be used as an optical preamplifier in a receiver for a wide range of wavelengths.<>
Keywords :
erbium; fibre lasers; laser theory; optical communication equipment; optical filters; optical losses; optical pumping; 1.55 micron; 10 dB; EDFA; EDFAs; Er-doped fibre amplifiers; IR; amplifier gain peak; amplifier length; enhanced optical gain; erbium-doped fiber amplifiers; filter insertion loss; gain improvement; narrow-bandpass optical filters; optical filters; optical preamplifier; optical receivers; optimum filter position; pump loss; receiver; Erbium-doped fiber amplifier; Isolators; Optical amplifiers; Optical fiber amplifiers; Optical filters; Optical losses; Optical pumping; Optical receivers; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
