Single-sided output Sn/Er/Yb distributed feedback fiber laser

A distributed feedback laser based on Sn/Er/Yb fiber is demonstrated. Unlike previous Er/Yb DFB lasers, hydrogenation is not required for grating fabrication. Single-sided output operation is obtained by directly splicing one end of the active grating to a broadband high reflecting grating, with 10 mW output power achieved for 110 mW pump power. Although hydrogenation is able to enhance the photosensitivity/grating strength further, this is actually found to degrade the laser efficiency due to increased losse