Effect of the Excited State Absorption on the Efficiency
of Erbium-Doped DFB Fiber Lasers¹

J. del Valle-Hernández^a, Y. O. Barmenkov^a, S. A. Kolpakov^b, and M. V. Andrés^c, *

^a Centro de Investigaciones en Óptica, Loma del Bosque 115, Col. Lomas del Campestre,
León, 37150, Gto., Mexico

^b Departamento de Óptica, Universidad de Valencia,
Dr. Moliner 50, 46100, Burjassot (Valencia), Spain

^c Departamento de Fisica Aplicada—ICMUV, Universidad de Valencia,
Dr. Moliner 50, 46100, Burjassot (Valencia), Spain

*e-mail: Miguel.Andres@uv.es

Received July 8, 2011; in final form, July 20, 2011; published online October 24, 2011

Abstract—In this paper, a model of erbium-doped distributed feedback fiber laser is proposed and discussed.
The model is based on a fundamental matrix approach and accounts for all types of losses including the active
fiber background loss and the loss originated from excited state absorption immanent to erbium ions. It is shown
that the excited state absorption loss is a main limiting factor to the laser efficiency. The model permits to opti-
mize the laser parameters including fiber Bragg grating strength and position of -phase defect. It is shown that
applying our optimization procedure the pump-to-signal conversion ratio can be increased by 60% for the same
device length and pumping conditions.

10.1134/S1054660X11230058

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