Single mode lasers based on slots suitable for photonic integration.

The re-growth free single mode lasers based on etched slots suitable for photonic integration are presented in this paper. The fabricated 650 μm long laser exhibits a threshold current and a slope efficiency of about 32 mA and 0.12 mW/mA, respectively. The stable single mode operation has been observed with a side mode suppression ratio (SMSR) over 50 dB at a current injection of 100 mA for the fabricated laser. Such a laser integrated with electroabsorption (EA) modulator is also demonstrated. The integrated device has an extinction ratio over 10 dB at 2.2V driving voltage with the lasing wavelength of around 20 nm positive detuning relative to the gain peak. The bandwidth measured is about 3 GHz for the integrated device.