Phase chaotic laser communication system based on time delay double-balance detection structure

Abstract

The invention discloses a phase chaos laser communication system based on a time delay double-balance detection structure, the phase chaos laser communication system comprises a transmitting end, a transmission channel and a receiving end which are connected in sequence, the transmitting end comprises a chaos encryption module, and the receiving end comprises a chaos decryption module. According to the invention, the structure is simple, and high-complexity chaos generation can be realized under a low-gain condition, so that the requirements on laser power and detector sensitivity required in an actual system building process are reduced, and low-cost and high-performance secret communication is realized. According to the invention, the defect of chaos dead zone in the prior art is overcome, the output chaos signal has better time delay label hiding capability, and in addition, the high-security communication effect can be realized under the condition of low gain.

Description

technical field [0001] The invention belongs to the technical field of confidential communication and information security, and in particular relates to a phase chaotic laser communication system. Background technique [0002] Chaotic secure communication is a secure communication method based on the physical level. Chaotic secure communication is mainly based on the characteristics of ergodicity, aperiodicity, broadband spectrum continuity, and noise-like properties of chaotic signals, and encryption is realized by hiding transmitted messages in chaotic signals. Chaotic synchronization is the basis for secure communication, which means that two chaotic systems gradually develop into the same orbit after being controlled by the outside world. The "master-slave" synchronization scheme is often used in the chaotic synchronous one-way coupling structure. The master system is called the "transmitter", and the slave system is called the "receiver". In the actual communication pr...

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Problems solved by technology

[0003] At present, the optoelectronic time-delay feedback oscillator in the structure of chaotic laser communication system often uses a single-tube photodetector to realize photoelectric conversion, which can only receive the quadrature component or the in-phase component of the optical signal, so half of the optical power is wasted. Large loop feedback gain enables effective start-up of the system's internal oscillator

In addition, the setting of the bias phase of the Mach-Zehnder interferometer in the system structure has an important influence on the onset of chaos, and when the bias phase is set to some special phase value, there will be a phenomenon that a single light component cannot start to vibrate, resulting in The chaotic carrier cannot be obtained during the actual debugging process

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