Photonic generation of frequency-modulated continuous-wave based on the period-one dynamics in a semiconductor laser under modulated optical injection

摘要

A scheme for generating frequency-modulated continuous-wave (FMCW) based on an optically injected semiconductor laser (SL) is proposed and demonstrated experimentally. A modulated light injection drives an SL into period-one (PI) state with modulated microwave frequency for generating FMCW, and then an optical feedback is introduced to further enhance the frequency comb contrast of the generated FMCW. Under proper operation conditions, a FMCW signal with a sweep range of 11.39 GHz (10.08 GHz-21.47 GHz) and a sweep rate of 0.72 GHzs is obtained, and the frequency comb contrast is increased by 20 dB after introducing the suitable optical feedback.