Experimental evaluation of the saturation-tone method for C-band EDFA gain characterization.

Authors

Ali Can Aygar, Firat Ertac Durak

Published in

Applied optics. Volume 65. Issue 28. Pages 9843-9851. Oct 01, 2026.

Abstract

Spectral gain characterization of erbium-doped fiber amplifiers (EDFAs) routinely uses broadband ASE loading, which saturates the amplifier but presents a continuous spectrum, not a defined channel set. A saturation tone with a weak probe offers a defined-load alternative, yet its fidelity to a multi-channel load, and its dependence on the pumping architecture, remain experimentally unestablished. We compare tone-based and nine-channel WDM gain spectra for a C-band EDFA across six pumping configurations at -10 and 0 dBm. The closest agreement reaches 0.23 dB RMSE; the optimal tone is set by the pumping configuration but independent of pump direction under 980 nm. Saturation removes the correctable level offset, leaving a shape-limited residual.

PMID:
42837566
Bibliographic data and abstract were imported from PubMed on 07 Oct 2026.

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