Abstract
GaAs/GaAlAs integrated twinguide DFB lasers with firstorder contacted surface grating are fabricated from MBE-wafers by electron beam lithography and ion milling. A room temperature CW threshold current of 40 mA is obtained for a BCRW structure with a coupling coefficient of 60cm−1. The lasers exhibit stable singlemode operation with a sidemode suppression of more than 25 dB.
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