Fabrication approach for antiphase narrow linewidth complex coupled 1.55 mu m DFB lasers
21 January 1999
A new method for fabricating narrow linewidth antiphase complex coupled MQW DFB lasers by periodically etching the active layer and quartemary InGaAsP overgrowth is reported. The minimum linewidth for a 375 mu m long ridge waveguide laser is only 250 kHz at an optical output power of 4mW.