Method and device for generating broadband chaotic signal similar to white noise
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A chaotic signal and generating device technology, applied in the direction of electromagnetic transmitters, etc., can solve the problem of uneven power spectrum of chaotic signals, achieve the effect of eliminating periodicity and improving confidentiality
Active Publication Date: 2013-10-23
TAIYUAN UNIV OF TECH
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[0004] In order to solve the technical problem that the power spectrum of the chaotic signal generated by the current chaotic laser generating device is affected by the relaxation
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[0020] The implementation is as image 3 , is a schematic diagram of a specific structure of a broadband chaotic signal that is similar to white noise. Its specific implementation is as follows: A device for generating a broadband chaotic signal similar to white noise includes a single-feedback semiconductor laser 5 , a single-feedback semiconductor laser 6 , a fiber coupler 3 and a balance detector 4 . Wherein, the single feedback semiconductor laser 5 includes a semiconductor laser 5a, a polarization controller 5b, a fiber coupler 5c, an adjustable optical attenuator 5d, a fiber mirror 5e and a fiber isolator 5f. The single feedback semiconductor laser 6 includes a semiconductor laser 6a, a polarization controller 6b, a fiber coupler 6c, an adjustable optical attenuator 6d, a fiber mirror 6e and a fiber isolator 6f.
[0021] The continuous light output by the semiconductor laser 5a passes through the polarization controller 5b, the fiber coupler 5c and the adjustable optica...
Embodiment approach 2
[0023] Implementation mode two as Figure 6 , is a schematic diagram of another specific structure for generating a broadband chaotic signal similar to white noise. Its specific implementation is as follows: A device for generating a broadband chaotic signal similar to white noise includes a semiconductor laser 7 with one-way injection of external light, a semiconductor laser 8 with one-way injection of external light, a fiber coupler 3 and a balance detector 4 . Wherein, the external light unidirectional injection semiconductor laser 7 includes a semiconductor laser 7a, a polarization controller 7b, a fiber circulator 7c, an optical attenuator 7d, a semiconductor laser 7e and a fiber isolator 7f. The external light unidirectional injection semiconductor laser 8 includes a semiconductor laser 8a, a polarization controller 8b, a fiber circulator 8c, an optical attenuator 8d, a semiconductor laser 8e and a fiber isolator 8f.
[0024] The continuous light output by the semicondu...
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Abstract
A method for generating a broadband chaotic signal similar to white noise comprises the steps that beat frequency is carried out on two paths of chaotic lasers through an optical fiber coupler, the two paths of chaotic lasers are divided into two paths with the equal intensity, balanced detection is carried out on the two paths of optical signals, and a difference value signal is extracted and converted into a corresponding electric signal. A device for generating the broadband chaotic signal similar to the white noise comprises two chaotic laser emission devices, the optical fiber coupler and a balance detector. The optical frequencies of the chaotic laser emission devices are not equal, and an optical frequency difference is the spectral line width of the chaotic lasers. The chaotic signal generated through the method has the wide and flat frequency spectrum similar to that of the white noise, no rectilinear oscillation exists on the frequency spectrum, and periodicity caused when the chaotic lasers are generated through a time delay system can be thoroughly eliminated; the security of chaotic communication, the measurement accuracy of a radar and an optical time domain reflector, and the randomness of physical random numbers are improved. The method and device can be applied to the fields of communication, remote sensing, sensing and the like.
Description
technical field [0001] The invention relates to a chaotic signal, in particular to a method and device for generating a wide-band chaotic signal similar to white noise, which can be used for secure communication, radar, optical time domain reflectometer and physical random number generation. Background technique [0002] Broadband chaotic signals have noise-like characteristics and larger amplitudes. Therefore, in secure communication (Nature, Vol.437, p.343-346, 2005 and Phys.Rev. Lett., Vol.100, 194101, 2008), Physical random number generator (Nat. Photonics, Vol. 2, p.728-732, 2008 and Phys. Rev. Lett., Vol.103, 024102, 2009), radar (IEEE J. Sel. Top. Quantum Electron. , Vol. 10, p.991-997, 2004 and IEEE J. Quantum Electron. Vol.40, p.815–820, 2004) and Time Domain Reflectometry (IEEE Photon. Technol. Lett. Vol. 20, p. 1636-1638, 2008 and IEEE Electron Device Lett. Vol.32, p.372–374, 2011) are widely used. At present, the circuit generation methods of broadband chaotic ...
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