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The performance of a continuous-wave Dy:GeAsGaSe chalcogenide glass fiber laser operating on the 6H11/2 rarr 6H13/2 transition at 4.2-4.7 mum is studied using numerical modeling. A double-clad fiber geometry is assumed, with direct pumping of the 6H11/2 level at 1.7 mum. It is shown that simultaneous lasing on the 6H13/2 rarr 6H15/2 transition serves to effectively depopulate the 6H11/2 level and significantly improve the efficiency and power scalability. A slope efficiency of 0.16 is calculated when the fiber loss is 1 dB/m. For efficient operation, it is necessary to keep the fiber loss below ap5 dB/m.