Carrier density nonuniformity along a semiconductor laser cavity plays an important role in the frequency modulation of Fabry-Perot-type lasers1 ; but in the case of DFB lasers, the role of this nonuniformity could be inherently different from the Fabry-Perot case because of its local feedback action. We have made what we believe to be the first experiments on artificial control of the carrier density distribution in a DFB laser cavity by partitioning the electrode.

© 1986 Optical Society of America

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