Abstract
The small signal gain coefficient and the gain of Erbium-Doped Fiber Amplifier (EDFA) in the wavelength range (1400-1700 nm) for different erbium concentrations and different amplifier lengths are calculated and studied. A core graded-index and erbium-doped concentration, are optimized for an EDFA in simplified two-level model. There is evidence to show that, the gain increases with the erbium concentration and the amplifier length. Where the relation between the gain and the amplifier length at different wavelengths is linear with the maximum gain at &lambda = 1530 nm. Also the temperature dependence of the small signal gain coefficient and the gain at the peak wavelength of EDFA was studied which shows, slightly increase in the values of both with temperature. The value of the signal wavelength was chosen in the gain window of EDFA at 1530 nm.
Highlights
Rare earth doped fiber amplifiers and laser are important tools in understanding and designing new optical devices
Erbium-Doped Fiber Amplifier (EDFA) are characterized by gain which depends on erbium concentrations and this feature is very interesting in the modern optical transmission systems which use Wavelength Division Multiplexing (WDM) (Kemtchou et al, 1997)
Where the relation between the gain and the amplifier length at different wavelengths is linear with the maximum gain at λ = 1530 nm
Summary
Rare earth doped fiber amplifiers and laser are important tools in understanding and designing new optical devices. EDFAs are characterized by gain which depends on erbium concentrations and this feature is very interesting in the modern optical transmission systems which use Wavelength Division Multiplexing (WDM) (Kemtchou et al, 1997). Erbium-Doped Fiber Amplifiers (EDFAs), as key components in Wavelength Division Multiplexing (WDM) systems in optical telecommunication, have received great attention over the past 10 years. A remark able modeling was introduced by Giles and Desurvire (1991), which established the propagation and rate equations for a two-level homogeneous laser medium. This approximated model is suitable for analyzing open-loop optical fiber amplifiers and the steadystate operation of the optical fiber networks
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