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Chaotic encryption method for safety of FSO (Free Space Optics)

A free-space, chaotic encryption technology, applied in free-space transmission, secure communication devices, electromagnetic transmitters, etc., can solve the problem that free-space optical communication systems are easily intercepted, and achieve the effect of reducing theft

Inactive Publication Date: 2015-02-04
国网吉林省电力有限公司信息通信公司 +1
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Problems solved by technology

[0003] The present invention provides a chaotic encryption method for free space optical communication FSO security in order to solve the problems that the existing free space optical communication system is easy to be intercepted during the communication process, etc.

Method used

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  • Chaotic encryption method for safety of FSO (Free Space Optics)
  • Chaotic encryption method for safety of FSO (Free Space Optics)

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specific Embodiment approach 1

[0013] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this embodiment, the chaotic encryption method of free space optical communication FSO security, this method is realized by the following steps:

[0014] 1. Input signal S i After the optical modulator C6 driving the chaotic circuit is modulated with the synchronous output signal from the delayer D1, the modulated signal enters the erbium-doped optical fiber ring M through the coupler C2, and in the ring M, the signal coupled by the coupler C2 The signal is fed back to the wavelength division multiplexer C5 through the polarization controller A and a section of erbium-doped optical fiber. Among them, the loss coefficient of the optical modulator C6 varies with the input signal S i The loss coefficient ε i The expression of can remember ε i =60+10S i , the input signal S i is a digital input signal that can be expressed as:

[0015] τ=(2n+1)T / 2,S i = 0;

[0016] τ=2nT / 2,S i = 1;

[00...

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Abstract

The invention discloses a chaotic encryption method for the safety of an FSO (Free Space Optics), and solves the problems that an existing FSO system is easily intercepted in a communication process. The chaotic encryption method comprises the following steps: firstly, performing encryption conversion on a transmitted signal Si and a chaotic signal generated by a monocycle erbium-doped fiber laser system, transmitting the signals to an atmosphere transmission channel, and then receiving the signal in the atmosphere transmission channel by a receiving system, wherein the signal and a synchronous chaotic signal generated by the monocycle erbium-doped fiber laser system can be used for decryption conversion, and the signal obtained by the decryption conversion can be marked as So. According to the chaotic encryption method provided by the invention, the chaotic signal generated by the monocycle erbium-doped fiber laser system can be encrypted to realize the safety transmission of the FSO.

Description

technical field [0001] The invention relates to a chaotic encryption method for free space optical communication FSO security. Background technique [0002] FSO communication is a communication method that uses laser as an information carrier and transmits through the atmosphere or outer space, also known as free space optical communication. It was originally used in military affairs. With the development of society, FSO communication technology has entered the stage of practical research, and corresponding experimental systems and commercial products have come out both at home and abroad. It is usually used to transmit images, sound and video files, etc., and there is a need for confidential transmission in many occasions. Generally speaking, the confidentiality of free-space optical communication is very good, because the beam of infrared laser is very narrow and invisible, it is difficult to find the information link in the air, at the same time, the directionality of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04B10/11H04B10/50
Inventor 王圣达隋吉生赵亮丛犁陈晓娟车小磊王晓辉
Owner 国网吉林省电力有限公司信息通信公司
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