Abstract
We present a DFB laser with extended direct modulation bandwidth based on groove-in-trench waveguide structure. The threshold currents of the fabricated DFB lasers are 8.0 mA and 19.1 mA at 25 °C and 85 °C, respectively. The 3dB bandwidths of the fabricated laser with an inject current of 60 mA is 29.2 GHz and 16.2 GHz at 25 °C and 85 °C, respectively. By etching groove-in-trench waveguide structure, we obtain a 3dB bandwidth enhancements of 3.5 GHz and 4.6 GHz at 25 °C and 85 °C, respectively. Transmissions of 25.8 Gb/s at 25 °C and 55 °C and 14.0 Gb/s at 85 °C with clear eye openings have been demonstrated.
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