Signal-induced refractive index changes in erbium-doped fiber amplifiers

Author

Janos, Mark ; Guy, Stephen C.

Author_Institution

Dept. of Electr. Eng., Sydney Univ., NSW, Australia

Volume

16

Issue

4

fYear

1998

fDate

4/1/1998 12:00:00 AM

Firstpage

542

Lastpage

548

Abstract

This paper reports the measurement and analysis of signal power-induced changes in the refractive index spectrum of an aluminosilicate erbium-doped fiber amplifier (EDFA). For a constant 980 nm pump power of 11 mW, a 1553 nm signal power of 4.6 mW caused a peak-to-trough change in refractive index of (3.8±0.4)×10 ^-8 across the EDFA gain spectrum. A Kramers-Kronig transform of the signal-induced change in absorption coefficient agreed well with the measured change in refractive index. This result conflicts with the behavior of the system predicted by a homogeneously broadened two-level model and suggests limitations in the representation of the Er³⁺:glass system by a discrete set of homogeneously broadened transitions

Keywords

Kramers-Kronig relations; absorption coefficients; erbium; fibre lasers; optical communication equipment; optical pumping; refractive index; spectral line broadening; 11 mW; 1553 nm; 4.6 mW; 980 nm; EDFA; EDFA gain spectrum; Er³⁺:glass system; Kramers-Kronig transform; absorption coefficient; aluminosilicate erbium-doped fiber amplifier; constant nm pump power; erbium-doped fiber amplifiers; homogeneously broadened transitions; homogeneously broadened two-level model; peak-to-trough change; refractive index spectrum; signal-induced change; signal-induced refractive index changes; Absorption; Discrete transforms; Erbium-doped fiber amplifier; Optical fibers; Optical refraction; Optical signal processing; Predictive models; Refractive index; Signal analysis; Signal processing;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.664061

Filename

664061