Photonics Research, 2019, 7 (11): 11001306, Published Online: Oct. 30, 2019
High-speed optical secure communication with external noise source and internal time-delayed feedback loop 
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Fig. 1. Experimental setup of the secure communication system. LD, tunable laser diode; PC, polarization controller; RF, radio-frequency amplifier; IM, intensity modulator; EDFA, erbium-doped fiber amplifier; PD, photodetector; PM, phase modulator; FBG, fiber Bragg grating; DL, tunable delay line; OC, optical coupler; SSMF, standard single-mode fiber; SPMF, self-phase-modulated optical feedback.
Fig. 2. (a) Time series of the original data signal at the output of intensity modulator; (b) time series of the encrypted signal at the output of FBG2; (c) time series of the decrypted signal at the output of FBG4; (d) eye diagram of the original data signal at the output of intensity modulator; (e) eye diagram of the encrypted signal at the output of FBG2; (f) eye diagram of the decrypted signal at the output of FBG4.
Fig. 3. (a) RF spectrum of the data signal; (b) RF spectrum of the encrypted signal; (c) RF spectrum of the decrypted signal.
Fig. 4. (a) BER variation of the decrypted signal with time-delay mismatch between DL1 and DL2; (b) BER variation of the decrypted signal with dispersion mismatch between FBG2 and FBG3; (c) BER variation of the decrypted signal with dispersion mismatch between FBG1 and FBG4.
Fig. 5. (a) ACF of time series with original parameter settings; (b) ACF of time series with time-delay concealment.
Fig. 6. (a) Peak size of ACF values under different dispersions of FBG1; (b) peak size of ACF values under different dispersions of FBG2.
Fig. 7. System structures for complexity measurement. (a) Phase chaos structure; (b) phase chaos with an external phase noise source; (c) SPMF loop with an external phase noise source.
Yudi Fu, Mengfan Cheng, Xingxing Jiang, Quan Yu, Linbojie Huang, Lei Deng, Deming Liu. High-speed optical secure communication with external noise source and internal time-delayed feedback loop[J]. Photonics Research, 2019, 7(11): 11001306.
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