High Performance O-Band Quantum Dot Distributed Feedback Laser Based on Laterally Coupled Grating

We present an <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$O$</tex>-band QD LC-DFB laser with an output power of 70 mW at 25° C. The device demonstrates single-mode operation across the full injection current range (50-250 mA) over a temperature span of 20-100° C, achieving a maximum SMSR of 61 dB, a RIN of −158 dB/Hz at 15 GHz and a 1 dB compression point of 25 dBm under 3 GHz RF modulation.