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Method for synchronizing laser chaos pulses

A pulse synchronization and chaotic technology, applied in the field of communication, can solve the problems of limiting the speed of encryption and decryption, restricting the application of chaotic secure communication, and difficult to achieve, and achieves the effect of improving security.

Inactive Publication Date: 2012-07-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, chaotic secure communication has not been widely used, mainly for the following two reasons: 1. Limited by the bandwidth of electronic devices, it is difficult for chaotic circuits to generate high-rate chaotic sequences, which limits the speed of encryption and decryption in the communication process
2. The synchronization accuracy of laser chaos is high and difficult to achieve
These two problems have restricted the application of chaotic secure communication

Method used

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  • Method for synchronizing laser chaos pulses
  • Method for synchronizing laser chaos pulses
  • Method for synchronizing laser chaos pulses

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and example the present invention is described in further detail.

[0020] figure 1 It is a flow chart of laser chaotic pulse synchronization method, specifically:

[0021] Step 1. Both the transmitting end and the receiving end use the bias current, modulation current and optional initial value to generate an optical chaotic signal respectively, which are respectively denoted as P1 and P2;

[0022] The second step is to convert the optical chaos signals at the transmitting end and the receiving end into electrical signals E1 and E2 respectively through photodetectors;

[0023] The third step samples E1 and E2 with the same synchronous interval Δt.

[0024] Step 4 For the transmitting end, subtract the sampled electrical signal E1 from the sampled electrical signal E2, then multiply the coupling coefficient k to obtain the feedback signal, and finally compare the feedback signal with the bias current and modulation curren...

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Abstract

The invention provides a method for synchronizing laser chaos pulses, which specifically comprises the steps of converting an optical chaos signal P1 and an optical chaos signal P2 generated by a transmitting terminal and a receiving terminal respectively into an electrical signal E1 and an electrical signal E2 and sampling the electrical signal E1 and the electrical signal E2; using a sampling value of the electrical signal E2 to decrease a sampling value of the electrical signal E1 and then multiply by coupling coefficient K to obtain a feedback signal of the transmitting terminal, and feeding the feedback signal back to the transmitting terminal to modulate the working current of a laser device of the transmitting terminal; and repeating the modulating steps till signals of the transmitting terminal and the receiving terminal are synchronized. The method for synchronizing the laser chaos pulses uses a pulse synchronization mode, the quantity of chaos signals transmitted in a channel is much less than the quantity of chaos signals transmitted by means of a common chaos synchronization method, and a chaos system is difficultly recovered through intercepted pulse signals if the signals are intercepted, thereby effectively improving safety of secret communication.

Description

technical field [0001] The invention relates to the communication field, in particular to a laser chaotic pulse synchronization method, which is suitable for secure communication. Background technique [0002] Due to the unpredictable and highly sensitive initial value of the chaotic signal itself, the chaotic secure communication has a very high degree of secrecy, and has become one of the hotspots in the field of information science. The research on chaotic secure communication has gone through more than ten years in the world, and many achievements have been made in the aspects of chaos control and synchronization methods. However, chaotic secure communication has not been widely used, mainly for the following two reasons: 1. Limited by the bandwidth of electronic devices, it is difficult for chaotic circuits to generate high-rate chaotic sequences, which limits the speed of encryption and decryption in the communication process. 2. The synchronization accuracy of laser ...

Claims

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Application Information

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IPC IPC(8): H04L9/00
Inventor 胡汉平王祖喜程孟凡颜金子于志良
Owner HUAZHONG UNIV OF SCI & TECH
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