Fig. 1. Scheme for MFC generation through cascaded optically injected semiconductor lasers

Fig. 2. Output power spectra of SL1 under different injection strengths at frequency detuning of 10 GHz. (a) ξi=0.03; (b) ξi=0.047; (c) ξi=0.1

Fig. 3. Number of comb lines and bandwidth versus injection strength at frequency detuning of 10 GHz and amplitude variation of ±10 dB for MFCs generated by SL1

Fig. 4. Output power spectra of SL1 under different frequency detunings at injection strength of 0.04. (a) fi=7 GHz; (b) fi=10 GHz; (c) fi=12 GHz

Fig. 5. Number of comb lines and bandwidth versus frequency detuning at injection strength of 0.04 and amplitude variation of ±10 dB for MFCs generated by SL1

Fig. 6. Output power spectra of SL2 under different injection strengths at frequency detuning of 10 GHz. (a) ξi=0.03; (b) ξi=0.1; (c) ξi=0.2

Fig. 7. Number of comb lines and bandwidth versus injection strength at frequency detuning of 10 GHz and amplitude variation of ±10 dB for MFCs generated by SL2

Fig. 8. Output power spectra of SL2 under different frequency detunings at injection strength of 0.2. (a) fi=6 GHz; (b) fi=31 GHz; (c) fi=55 GHz

Fig. 9. Number of comb lines and bandwidth versus frequency detuning at injection strength of 0.2 and amplitude variation of ±10 dB for MFCs generated by SL2

Fig. 10. MFC effect comparison for single and cascaded injections. (a) Single injection (0.04, 10 GHz); (b) cascaded injection (0.2, 55 GHz); (c) cascaded injection (0.2, 47 GHz)