Title :
Study of the complex atomic susceptibility of erbium-doped fiber amplifiers
Author :
Desurvire, Emmanuel
Author_Institution :
AT&T Bell Labs., Holmdel, NJ, USA
fDate :
10/1/1990 12:00:00 AM
Abstract :
A study of the complex atomic susceptibility of erbium-doped fiber amplifiers operating near the 1.53-μm transition (4I 13/2-4I15/2) developed from a semiclassical theoretical description is presented. Expressions for the emission cross section σe(λ) and absorption cross section σa(λ) of erbium:glass as a quasi-three-level laser system with Stark-split sublevel manifolds are derived. The results are used to calculate the cross sections of aluminosilicate erbium-doped fibers at low temperatures (T=4.2, 77 K) and at room temperature. It is demonstrated that an expression for the gain coefficient of the fiber amplifier can be derived from the expression of the susceptibility. Using Kramers-Kronig relations, an expression for the refractive index change in the fiber is derived. The theoretical spectral gain profile of the fiber amplifier and concurrent refractive index changes are analyzed for different pumping regimes
Keywords :
Kramers-Kronig relations; erbium; fibre lasers; laser theory; refractive index; 1.53 micron; 4.2 K; 77 K; Al2O3-SiO2; Er doped fibre amplifers; Kramers-Kronig relations; Stark-split sublevel manifolds; absorption cross section; aluminosilicate; complex atomic susceptibility; emission cross section; gain coefficient; lasing transitions; optical pumping; pumping regimes; quasi-three-level laser system; refractive index change; room temperature; spectral gain profile; Absorption; Crosstalk; Erbium; Erbium-doped fiber amplifier; Glass; Laser excitation; Laser modes; Laser theory; Optical fiber communication; Optical fiber polarization;
Journal_Title :
Lightwave Technology, Journal of
