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Practical design of double-clad ytterbium-doped fiber amplifiers using Giles parameters

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4 Author(s)
Brunet, F. ; INO, Quebec, Que., Canada ; Taillon, Y. ; Galarneau, P. ; LaRochelle, S.

We present a simple and accurate method for measuring the Giles parameters of a double-clad ytterbium-doped fiber. The characterization is performed by cut-back on the doped fiber under constant pumping. Using nonlinear curve-fitting of the amplified spontaneous emission (ASE) power-density spectra, along with iterative solution of the photon balance model, we compute both the small-signal gain at complete population inversion and the small-signal absorption of the fiber. The method successfully predicts the extraction efficiency of an amplifier operating at 1064 nm. The ratio between the signal power and the out-of-band ASE power at the output of the amplifier is also accurately predicted by introducing spurious feedback from the fiber facets in the photon balance model. This work shows that a fiber facet reflectivity of a few thousandths of a percent (-40 to -50) dB can significantly enhance the out-of-band ASE power.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:40 ,  Issue: 9 )

Date of Publication:

Sept. 2004

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