Tunable and broadband microwave frequency combs based on a semiconductor laser with incoherent optical feedback*
Zhao Mao-Ronga), Wu Zheng-Maoa), Deng Taoa), Zhou Zhen-Lia), Xia Guang-Qionga),b)†
       
Schematic diagram for generating tunable and broadband MFCs. SL: semiconductor laser; ROT: Faraday rotator; NDF: neutral density filter; M: mirror.