, Volume 6, Issue 1, pp 45-47
Date: 01 Apr 2010

A theoretical model of thulium-doped silica fiber’s ASE in the 1900 nm waveband

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A theoretical model in the 1900 nm waveband for amplified spontaneous emission (ASE) of thulium-doped silica fiber is presented. The ASE spectral power as functions of the fiber length and the pump power is investigated by solving the rate and propagation equations. By calculation, when the concentration of thulium in fiber is 2.25 × 1025 m−3, the fiber core diameter is 2.6 μm, and the pump power is 200 mW at 808 nm, the optimal fiber length is 8.1 m, and the output power of ASE can reach 60 mW in the range of 1800–1950 nm with this fiber length. The optical-to-optical conversion is 30.3%. The optimal pump power also can be obtained by this model.

This work has been supported by the National Natural Science Foundation of China (No. 60677027), Research Fund for the Doctoral Program of Higher Education of China (No. 20060422025), Natural Science Foundation of Shandong Province of China (No. 2006ZRC01022), Science Fund for Distinguished Young Scholars of Shandong Province of China (No. 2008JQB01155), and Research Award Fund for Outstanding Middle-aged and Young Scientist of Shandong Province of China (No. 2007BS08003).