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

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2 Author(s)
Janos, M. ; Dept. of Electr. Eng., Sydney Univ., NSW, Australia ; Guy, S.C.

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

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Lightwave Technology, Journal of  (Volume:16 ,  Issue: 4 )