Doped fiber amplifier and fiber laser

The matematical model of Doped fiber amplifier and fiber laser based on Runge–Kutta method

Rare earth amplifiers become a major component as an active device in fiber optic communication systems because of there is no requirement of electro-optical conversion during the amplification process. The first implementation of active fiber optic amplifier was demonstrated in 1994 with erbium-doped fiber amplifier (EDFA) . Demand on higher bandwidth bring about to use the other rare earth doped fiber such as Thulium-doped fiber amplifiers (TDFAs) . TDFAs are a promising candidate for the S-band amplification because the amplification bandwidth of the TDFA is centered at 1470 nm, which falls within the low loss region of the silica fibers.
The mathematical model is developed using a Desurvire model of EDFA as a base (Desurvire, 1994). The mathematical equations to calculate stimulated absorption and emission cross section rate between level 2 and 3 of single pass TDFA are presented is these Matlab codes. The effect of pump power, signal power, signal wavelength, TDF length and ASE on the gain and NF of the EDFA abd TDFA can be analyzed from the numerical simulation of TDFA mathematical model.