Laser chaotic signal generating device capable of hiding feedback delay characteristic

A technology for chaotic signal and generating device, which is applied to devices for controlling laser output parameters, safety communication devices, digital transmission systems, etc., can solve the problems of reducing the complexity of laser chaotic signals, threatening the security of chaotic synchronous communication systems, etc. safety effect

Inactive Publication Date: 2013-03-20
SOUTHWEST JIAOTONG UNIV
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  • Summary
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Problems solved by technology

It needs to be pointed out that when the feedback intensity is small, although the delay characteristics of the laser chaotic carrier signal can be hidden, the complexity of the laser chaotic signal will be reduced, which threatens the security of the chaotic synchronous communication system on the other hand.

Method used

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  • Laser chaotic signal generating device capable of hiding feedback delay characteristic
  • Laser chaotic signal generating device capable of hiding feedback delay characteristic
  • Laser chaotic signal generating device capable of hiding feedback delay characteristic

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Embodiment Construction

[0014] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0015] Such as figure 1 As shown, the device of the present invention consists of an annular feedback cavity vertical cavity surface emitting laser containing an adjustable polarizer, two beam splitters, an adjustable polarizer, two plane mirrors, a neutral density filter, and an optical isolator , and a photodetector.

[0016] exist figure 1 Among them, the working wavelength of the vertical cavity surface emitting laser is λ=850nm, the working current is 1.5 times the threshold current, the two linear polarization modes of the output signal are respectively defined as XP, YP, and the intensity can be expressed as I x，y =|E x，y (t)| 2 , the total intensity of the output signal is I T =|E x (t)| 2 +|E y (t)| 2 where E x (t) represents the magnitude of XP, E y (t) represents the amplitude of YP. We assume that when the adjustable polari...

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Abstract

The invention discloses a laser chaotic signal generating device capable of hiding a feedback delay characteristic. An adjustable polarizing film is led in an annular feedback cavity of a vertical cavity surface emitting laser, so that even under larger feedback strength, the feedback delay characteristic of a laser chaotic signal can be successfully hidden only if the angle of the adjustable polarizing film is adjusted reasonably. According to the device disclosed by the invention, on the basis of ensuring the generation of the laser chaotic signal, the delay hidden characteristic of a chaotic carrier wave under the larger feedback strength is realized, and the safety of a chaotic communication system based on the vertical cavity surface emitting laser is enhanced.

Description

technical field [0001] The invention relates to a circular feedback cavity vertical cavity surface-emitting laser with an adjustable polarizer and the field of laser chaos, in particular to a chaotic signal generation technology capable of hiding the chaotic time delay. Background technique [0002] Vertical cavity surface emitting laser is one of the most competitive chaotic light sources for laser chaotic secure communication system. At present, the chaotic time series analysis technology is becoming more and more perfect. For the conventional laser chaotic carrier signal, if the eavesdropper can accurately obtain the feedback delay characteristics of the chaotic signal, the chaotic signal can be reconstructed by time series analysis techniques such as phase space reconstruction. , thus reducing the security of the communication system, therefore, generating a laser chaotic carrier signal that can hide the characteristics of the feedback delay has become an extremely attra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/06H04L9/00
Inventor 项水英潘炜江宁朱宏娜
Owner SOUTHWEST JIAOTONG UNIV
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