A Hybrid Integrated High-Precision Tunable Semiconductor Laser

• • Achieves a tuning range of ~51.8 nm with a tuning precision of ~0.03 nm, enabling dense wavelength-division multiplexing (DWDM) systems with 50 GHz channel spacing to be addressed without mode hops, directly reducing transceiver complexity and cost in optical networks. • • Delivers an intrinsic linewidth of ~1.21 MHz and a side-mode suppression ratio of 39.65 dB, meeting the requirements for coherent optical communication and LiDAR, where narrow linewidth and high SMSR are critical for phase-sensitive detection and ranging accuracy. • • Demonstrates a maximum on-chip power of 102.7 μW at 1551.69 nm, sufficient for short-reach optical interconnects and chip-scale sensing, while the continuous tuning range of ~3.5 pm supports fine frequency tuning for atomic clocks and spectroscopy. • • Exhibits long-term mode-hop-free operation under DC voltage tuning from −30 V to +30 V, ensuring reliable operation in field-deployed systems where environmental perturbations would otherwise cause mode instability, thereby reducing the need for active feedback control.