Uncooled distributed-feedback (DFB) lasers are routinely used commercially in a wide range of applications. We extended their single-mode-operation temperature range and improved their performance through threshold reduction by increasing the output power and by decreasing the variation of laser parameters with temperature, particularly for high temperatures. We optimized the laser-structure design and fabrication process. Strained multiple quantum wells were incorporated into the active layer. (source: spie.org)
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