Light propagation in the multi-mode double-clad erbium: ytterbium co-doped fiber: theory and experiment

摘要

The pump light and forward- and backward-amplified spontaneous emissions (ASE+/-) propagation in the multi-mode double-clad erbium: ytterbium co-doped fiber are analyzed numerically and measured experimentally. And the light propagation in hexagonal inner cladding based on geometrical optics are analyzed comprehensibly. We obtained that the suitable length of the fiber in optical fiber lasers is 2-2.5 m, and the 2 m long fiber emits at 1535 and 1543 nm simultaneously, and the peak-value wavelength of ASE+ changes to the long wavelength with an increase in the pump power. (C) 2003 Elsevier Ltd. All rights reserved. [References: 13]