Hybrid integrated low-noise linear chirp frequency-modulated continuous-wave laser source based on self-injection to an external cavity

A hybrid integrated low-noise linear chirp frequency-modulated continuous-wave (FMCW) laser source with a wide frequency bandwidth is demonstrated. By employing two-dimensional thermal tuning, the shows modulation of 10.3 GHz at 100 Hz chirped and 5.6 1 kHz frequency. The intrinsic linewidth 49.9 42 continuous tuning measured under static operation. Furthermore, by pre-distortion linearization source, it can distinguish 3 m length difference 45 km distance in fiber measurement experiment, demonstrating its application potential ultra-long sensing FMCW light detection ranging.