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A new self-aligned rib-waveguide structure using a large optical cavity for high-power single-mode operation is presented. cw output powers of 40 mW are achieved with linear light-current (L-I) characteristics and single transverse and longitudinal modes. Over the temperature interval 10 to 60 °C, we find a typical T0 of 270 K. This laser is easily coupled to a single-mode fiber and has been modulated to 2 GHz with only a 3-dB loss in output power.

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