A 1000μm-long three-electrode DFB laser with a large sidetuning and with a minimum linewidth of 4 MHz is demonstrated. The correlation between the main mode linewidth and DFB submode suppression is large. Side-modes on the opposite sides of the stop band are seen to broaden the linewidth to different extents. A Fabry-Perot mode 50 nm away has no observable effect on the linewidth.
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Öberg et al. (1989) studied this question.