Abstract
Results of improved 1.58 μm GaInAlAs strained quantum-well gain-coupled DFB lasers are presented. Besides the excellent spectral properties (singlemode yield of 75% and a sidemode suppression ratio of 45 dB), 20 mW output power and CW operation at 80%C have been obtained. A record 3 dB bandwidth of 11 GHz was measured. Spectral or dynamical instabilities due to the loss grating have not been observed.
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