Proc. SPIE. 9679, AOPC 2015: Optical Fiber Sensors and Applications
KEYWORDS: Signal attenuation, Telecommunications, Optical communications, Free space optics, Optical networks, All optical signal processing, Information security, Quantum communications, Network security, Channel projecting optics
Secure optical communication technologies are important means to solve the physical layer security for optical network. We present a scheme of secure optical communication system by all-optical signal processing technique. The scheme consists of three parts, as all-optical signal processing unit, optical key sequence generator, and synchronous control unit. In the paper, all-optical signal processing method is key technology using all-optical exclusive disjunction (XOR) gate based on optical cross-gain modulation effect, has advantages of wide dynamic range of input optical signal, simple structure and so on. All-optical XOR gate composed of two semiconductor optical amplifiers (SOA) is a symmetrical structure. By controlling injection current, input signal power, delay and filter bandwidth, the extinction ratio of XOR can be greater than 8dB. Finally, some performance parameters are calculated and the results are analyzed. The simulation and experimental results show that the proposed method can be achieved over 10Gbps optical signal encryption and decryption, which is simple, easy to implement, and error-free diffusion.
In order to realize the all-optical encryption for multi-wave and ultra-high speed, an all-optical encryption scheme is
proposed, which is based on pockels effect of LiNbO3 waveguide and optical-time-division-multiplexing (OTDM) in
LibNO3 waveguide. The coherently ultra-high speed plaintext and key are generated by OTDM in LibNO3 waveguide
and the XOR operation of optical plaintext and key are achieved by direct light interference. The feasibility and validity
of this scheme is verified by simulative experiment at 8 x 80Gbps with wavelength interval of 2nm.
An all-optical encryption system which can be used in fiber WDM system and directly encrypt multi-wave optical
signals is proposed. This scheme achieves multi-wave signals encrypting by the technology of generating coherently
multi-wave optical plain text, Key text and the technology of phase shift interference. The feasibility and validity of this
encrypting scheme are verified by simulative experiment for multi-wave signals at 8x10Gbps with wavelength interval
of 0.8nm, the simulative result shows that when the input Pi and Ki is Gauss pulse with duty cycle of 0.3, the bit error
rate and Q factor of encryption output are 0 and 164 respectively. Theory analysis and simulative experiment shows the
scheme is feasible and efficient.