Theoretical study on erbium ytterbium co-doped super-fluorescent fiber source

Abstract

Erbium ytterbium co-doped super-fluorescent fiber source (EYD-SFS) has been simulated by a theoretical model based on rate equations and power transfer equations. The output performances of four basic structures of EYD-SFS have been expressed, and it indicated that the DPF structure is a preferable structure. The dependence of output power, mean wavelength and bandwidth stability on the pump fiber length and the concentration of Er3+ and Yb3+ have also been studied. The results indicated with a proper doping concentration of Er3+ and Yb3+ of 6.0 × 1026 ions/m3 and 1.0 × 1027 ions/m3, the optimal gain fiber length is 3.6 cm. In this condition, good performances of DPF structure of EYD-SFS have been achieved.

Double pass broadband ASE light source with real-time wavelength adjustment

“…The pump rate can be expressed as, (6) Where: σpα is the pump absorption section, Pp is the pump power, νp is the pump optical frequency; Ap is the optical mode area of the pump light.…”

“…P (Z) represents the total optical power of all frequency light at the pump input port Z within the fiber. Supposing that the superfluorescence is uniformly distributed along the radial direction of the cross section of the optical fiber, it is only a function of the length of the optical fiber, and considering that the super-fluorescence is transmitted only in the basic mode LP01 in the optical fiber; At the same time, the interaction of Er 3+ is ignored, and the stimulated absorption of the pump high energy level and the laser upper level is ignored, then the evolution of super-fluorescence and pump light along the erbium-doped fiber can be described by the following equation: Through the analysis of advanced models, it is necessary to consider the excited state absorption of the pump state, the propagation of two spatially radially symmetric pump modes, the absorption of erbium ions and the backward loss [6] . After derivation, the upper energy and particle number of 980nm pump are:…”