Thermally Stable High Power 1.3 μm InAs/GaAs Quantum Dot Distributed Feedback Laser Arrays

We demonstrate a thermally stable, high-power InAs/GaAs quantum dot (QD) four-channel distributed feedback (DFB) laser array featuring an ultra-narrow linewidth and low noise. Each channel of the array delivers a continuous-wave output power exceeding 34 mW and 17 mW at $25~^{\circ }$ C and $85~^{\circ }$ C, respectively, with side-mode suppression ratios >45 dB. Furthermore, the device exhibits an ultra-narrow linewidth as low as 1.60 kHz and low relative intensity noise (RIN), with peak RIN values below −165 dB/Hz at $50~^{\circ }$ C. These results demonstrate the potential of QD DFB laser arrays for energy-efficient and cost-effective wavelength-division multiplexing data transmission systems in uncooled operation scenarios.