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Laser chaotic spread-spectrum transformation system with time delay hiding characteristic

A technology of transforming systems and lasers, which is applied in the field of lasers, can solve problems such as limiting the randomness of random key keys, restricting the security of chaotic secure communication, and limiting effective bandwidth, and achieves good noise-like spectral flatness and chaotic signal security. Enhanced performance and enhanced spectral flatness

Active Publication Date: 2017-05-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

With the deepening of research, the disadvantages of chaotic laser signals of external cavity lasers are gradually revealed: on the one hand, most of the energy in the spectrum of chaotic laser signals is concentrated near the relaxation oscillation frequency of the laser, resulting in uneven spectrum and limited effective bandwidth; On the one hand, due to the resonance characteristics of the external feedback cavity, the chaotic laser signal of the external cavity laser has obvious autocorrelation at the feedback delay
The above two defects restrict the security of chaotic secure communication, and also limit the rate of generating random keys and the randomness of keys

Method used

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  • Laser chaotic spread-spectrum transformation system with time delay hiding characteristic
  • Laser chaotic spread-spectrum transformation system with time delay hiding characteristic
  • Laser chaotic spread-spectrum transformation system with time delay hiding characteristic

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Embodiment

[0059] figure 1 It is a principle diagram of a laser chaotic spread-spectrum transformation system with time-delay concealment characteristic of the present invention.

[0060] In this example, if figure 1 As shown, the present invention has a laser chaotic spread spectrum conversion system with time delay hiding characteristics, including: chaotic external cavity laser, driving end and time lens three parts;

[0061] Wherein, the chaotic external cavity laser includes a semiconductor laser MSL, an optical coupler OC, and a mirror M, and the semiconductor laser MSL and the mirror M form a chaotic external cavity laser with feedback for generating an initial chaotic laser signal;

[0062] The driving end includes a multiplier, a radio frequency amplifier Amp, and a radio frequency source 1 and a radio frequency source 2, which are used to generate a driving signal to drive the photoelectric phase modulator PM1 and PM2;

[0063] The time lens includes the photoelectric phase m...

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Abstract

The invention discloses a laser chaotic spread-spectrum transformation system with a time delay hiding characteristic. A chaotic optical signal generated by an external-cavity semiconductor laser is subjected to spread-spectrum transformation through a time lens which is composed of photoelectric phase modulators PM1 and PM2 and a high-dispersion medium. To be specific, on the basis of time-frequency transformation of time domain Fourier transformation, chaotic spectrum is widened through increase of the dispersion measures; time delay label is hidden through adjustment of the relationship between a driving signal period and feedback time delay of a chaotic laser; spectrum is flattened as the chaotic laser signal is output after the spread-spectrum transformation based on the noise characteristic of chaotic signals; and a big efficient bandwidth is obtained.

Description

technical field [0001] The invention belongs to the technical field of lasers, and more specifically relates to a laser chaotic spread-spectrum conversion system with time-delay hiding characteristics. Background technique [0002] In recent years, major breakthroughs have been made in the application of chaotic lasers generated by external cavity lasers in secure communication, random key generation and other fields. With the deepening of research, the disadvantages of chaotic laser signals of external cavity lasers are gradually revealed: on the one hand, most of the energy in the spectrum of chaotic laser signals is concentrated near the relaxation oscillation frequency of the laser, resulting in uneven spectrum and limited effective bandwidth; On the one hand, due to the resonance characteristics of the external feedback cavity, the chaotic laser signal of the external cavity laser has obvious autocorrelation at the feedback delay. The above two defects restrict the sec...

Claims

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Application Information

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IPC IPC(8): H01S5/042
CPCH01S5/0427H01S5/0428
Inventor 江宁王超李桂兰林书庆邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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