Fig. 1. Experimental setup of commonly-driven chaos synchronization over single-span optical fiber (DL: driven laser; RL: response laser; OC: optical coupler; PC: polarization controller; OI: optical isolator; VOA: variable optical attenuator; FM: feedback mirror; EDFA: erbium-doped fiber amplifier; OF: optical filter; SMF: single-mode fiber; DCF: dispersion compensation fiber; P_j: injection power )

Fig. 2. Characteristics of driven laser output signal. (a) Optical spectra; (b) frequency spectra; (c) time series; (d) autocorrelation curve

Fig. 3. Chaos spectra. (a) Optical spectra before and after amplification; (b) optical spectra with filtering widths of 0.1 nm and 0.4 nm

Fig. 4. Influence of filtering width on transmission fidelity of chaotic signal. (a)-(c) Correlation curves of chaotic signal before and after transmission with filtering width of 0.1, 0.2, 0.5 nm; (d) fidelity of chaotic signal as a function of filtering width

Fig. 5. Influence of dispersion compensation deviation on transmission fidelity of chaotic signal. (a)-(c) Correlation curves of chaotic signal before and after transmission with dispersion compensation deviation of -3.1, 0, and +2.9 ps/nm; (d) fidelity of chaotic signal as a function of dispersion compensation deviation

Fig. 6. Influence of fiber input power on transmission fidelity of chaotic signal. (a)-(c) Correlation curves of chaotic signal before and after transmission with fiber input power of 1, 3.1, 5 mW; (d) fidelity of chaotic signal as a function of fiber input power

Fig. 7. Transmission distance optimization of chaotic signal. (a)-(c) Correlation curves of chaotic signal with transmission distance of 90, 200, 210 km; (d) optimized fiber input power and fidelity of chaotic signal as a function of transmission distance

Fig. 8. Experimental results of commonly-driven chaos synchronization over 200 km optical fiber. (a) Optical spectra; (b) frequency spectra; (c) time series; (d) correlation plot