Summary form only given. Recently it has been shown that small changes in pump wavelength within the 980-nm pump band change the shape of the gain spectrum of erbium-doped fiber amplifiers (EDFAs). These gain variations can be as large as 3 dB in a typical line amplifier and cannot be explained by the well known homogeneous model for EDFAs. Pump-induced gain changes must be accounted for in multiwavelength amplifiers and systems operating over the pump-wavelength-sensitive short-wavelength portion of the erbium gain band. In this paper, we compare the impact of pump-mediated inhomogeneities on the gain spectra of EDFAs pumped in the 1480- and 980-nm pump bands. We find that the shape of the EDFA gain spectrum is less affected by changes in pump wavelength in the 1480-nm band, and show that in both cases the dynamic gain tilt function (DGTF) is relatively insensitive to changes in pump wavelength. The latter indicates that inversion-induced gain changes can be predicted from a (measured) DGTF despite pump band and some signal band inhomogeneities. We present fluorescence line narrowing measurements that explain these results and suggest a physical mechanism for 980-nm band pump-mediated inhomogeneities.
Pump-mediated inhomogeneous effects in EDFAs and their impact on gain spectral modeling
01.01.1998
220726 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Analytic Model for Gain Modulation in EDFAs
British Library Online Contents | 2002
|Modeling Gain Dynamics in EDFAs: Space-Resolved Versus Lumped Models
British Library Online Contents | 2001
|Compatability of gain-stabilized EDFAs: a simulation study
British Library Conference Proceedings | 1999
|Protection of surviving channels in a cascade of pump-loss controllled gain-locked EDFAs
British Library Online Contents | 1998
|Gain-shifted thulium-amplifier efficiency rivals that of EDFAs
British Library Online Contents | 2001