Two- and three-sectional laterally coupled DBR laser fabricated by focused ion beam lithography

By using focused ion beam lithography, high performance 1.55 /spl mu/m emitting distributed Bragg reflector lasers were realized suitable for high speed optical telecommunication. Threshold currents of 8 mA and continuous wave efficiencies of 0.37 W/A for 600 /spl mu/m long devices were achieved. Stable single mode emission with side mode suppression ratios of > 40 dB were observed for the entire operation range. By using 3-sectional DBR-lasers, we could increase the output power of the lasers up to 68 mW. Also we achieved a higher single mode yield with side mode suppression ratios of more than 60 dB and a higher thermal stability.