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An identification method of chaotic laser external cavity time delay based on coherent domain

A technology of chaotic laser and identification method, applied in the field of laser, can solve the problem of inability to effectively identify time delay information, and achieve the effect of intuitive identification method, accurate information and improved identification time.

Active Publication Date: 2019-08-30
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0006] In order to solve the current identification method of chaotic laser external cavity time delay, the present invention is mainly a two-dimensional space mathematical analysis of chaotic signal intensity information in the time domain or frequency domain, facing various technical methods currently proposed to hide or suppress time delay information It is often impossible to effectively identify the technical problem of time delay information, and a method for identifying time delay of chaotic laser external cavity based on coherent domain is provided.

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  • An identification method of chaotic laser external cavity time delay based on coherent domain
  • An identification method of chaotic laser external cavity time delay based on coherent domain
  • An identification method of chaotic laser external cavity time delay based on coherent domain

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Embodiment Construction

[0025] The present invention proposes an identification method of chaotic laser external cavity delay based on the coherent domain. The specific flow chart of the identification method is as follows figure 1 shown. First, the external cavity feeds back the semiconductor laser to generate chaotic optical signals, and then injects two identical chaotic optical signals with an average power of more than 100mW, the same polarization direction, and a frequency difference equal to the fiber Brillouin frequency shift to both ends of the fiber. The two chaotic optical signals interfere with each other, and at the same time, they are subjected to electrostriction to generate an acoustic wave field. By collecting and processing the acoustic wave field signal, a three-dimensional map of its temporal and spatial distribution in the optical fiber can be obtained, and the chaotic laser can be identified from the three-dimensional image of the temporal and spatial distribution of the acoustic...

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Abstract

The present invention relates to the laser technology field, in particular to a coherent domain-based chaotic laser external cavity time delay identification method which solves the technical problemsthat a conventional chaotic laser external cavity time delay identification method mainly carries out the two-dimensional space mathematical analysis on the intensity information of a chaotic signalin the time domain or the frequency domain, when facing various technical methods of hiding or suppressing the time delay information provided at present, often cannot identify the time delay information effectively. The chaotic laser external cavity time delay identification method provided by the present invention carries out in an optical coherent domain and avoids a photoelectric conversion process of converting the chaotic laser into an electric signal in a time domain and frequency domain analysis method, and the whole chaotic laser external cavity time delay identification process is carried out in the optical domain, so that the chaotic laser external cavity time delay identification time is improved greatly. The method provided by the present invention is more accurate to identifythe chaotic laser external cavity time delay information, and can identify the chaotic laser external cavity time delay that cannot be identified effectively by the conventional method.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a method for identifying time delay of a chaotic laser external cavity based on a coherent domain. Background technique [0002] External-cavity feedback semiconductor lasers have the advantages of rich dynamic characteristics, good stability, and simple structure, and have been widely used in high-speed true random key generation, chaotic secure communication, and distributed optical fiber sensing. However, the chaotic laser signal generated by the external cavity resonance has the characteristics of feedback delay, and the implied periodicity reduces the security of the chaotic secure communication system, weakens the disorder of the generated random numbers and affects the distributed optical fiber sensing. signal-to-noise ratio, etc. Therefore, in recent years, the research on identifying the delay characteristics of external cavity feedback semiconductor lasers has received ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/00
Inventor 张建忠李铸平张明江刘毅王云才冯昌坤
Owner TAIYUAN UNIV OF TECH
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