A sub-mA-threshold-current operation (as low as 0.8 mA) of a high-mesa stripe geometry distributed reflector (DR) laser with a wirelike active distributed feedback (DFB) section and passive distributed Bragg reflector (DBR) section was realized under room-temperature continuous-wave conditions utilizing a narrow laser stripe (2.1 µm) and a large index coupling coefficient of 570 cm -1 .
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Ullah et al. (2007) studied this question.
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