Tunable and broadband microwave frequency combs based on a semiconductor laser with incoherent optical feedback<xref ref-type="fn" rid="cpb142009fn1">*</xref>

Tunable and broadband microwave frequency combs based on a semiconductor laser with incoherent optical feedback*

Zhao Mao-Rong^a), Wu Zheng-Mao^a), Deng Tao^a), Zhou Zhen-Li^a), Xia Guang-Qiong^a),^b)†

Pulse trains (left column) and corresponding power spectra (right column) of the RP state in the SL with incoherent optical feedback, where (a)–(d) correspond to points A-D in Fig. 2 , respectively.