Photonic microwave generation and stabilization using semiconductor lasers subject to optical injection and optical feedback
Kai-Hung Lo1*, Sheng-Kwang Hwang1,2
1Department of Photonics, National Cheng Kung University, Tainan, Taiwan
2Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan
* presenting author:Kai-Hung Lo,
Optical injection can induce period-one nonlinear dynamics in semiconductor lasers, resulting in continuously tunable microwave generation from a few to tens and even hundreds of gigahertz, limiting the application of period-one dynamics. Optical feedback can stabilize such generated microwaves, leading to significant reduction of microwave linewidth and phase noise. Highly stable and broadly tunable microwave generation is therefore feasible using nonlinear dynamics of semiconductor lasers. In this study, we numerically investigate how the optical feedback affects the microwave characteristics of the P1 dynamics in semiconductor lasers under various conditions of optical injection and optical feedback. In particular, short to intermediate feedback delay times are emphasized as integrated or small systems are much attractive for practical applications.

Keywords: nonlnear dynamics, microwave generation , optical feedback