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Optical domain cross-correlation operation method and device based on Talbot effect

An operation method and cross-correlation technology, applied in the field of optical domain cross-correlation operation method and device based on the Talbot effect, can solve the problems of output signal cycle reduction, output signal frequency multiplication, etc. The effect of large bandwidth and fast operation speed

Pending Publication Date: 2020-06-12
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, this method has the problem of multiplying the frequency of the output signal, that is, the period of the output signal is reduced relative to the period of the amplitude modulation and phase modulation, and the reduction is related to the modulation period.

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  • Optical domain cross-correlation operation method and device based on Talbot effect
  • Optical domain cross-correlation operation method and device based on Talbot effect
  • Optical domain cross-correlation operation method and device based on Talbot effect

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Embodiment 1

[0027] Such as Figure 1-5 As shown, this embodiment provides an optical domain implementation scheme for calculating the cross-correlation between different signals. Optical domain cross-correlation calculation method and device for Burt effect.

[0028] Among them, the optical domain cross-correlation calculation method based on the Talbot effect includes the following steps:

[0029] S1. Three pulse trains are respectively generated by three mode-locked lasers, and the three pulse trains are respectively modulated by the phase modulator to output three pulse trains after the secondary phase related to the signal cycle, wherein the first and second pulse trains The two-way pulse trains are then subjected to respective photoelectric modulators for amplitude modulation of different digital real signals;

[0030] Specifically, the pulse trains generated by the two mode-locked lasers are firstly modulated by the phase modulator with a quadratic phase related to the signal peri...

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Abstract

The invention belongs to the technical field of communication, calculation and radar, and particularly relates to an optical domain cross-correlation operation method and device based on the Talbot effect, and the device comprises a mode-locked laser, a photoelectric modulator, an IQ modulator, a 90-degree optical mixer, a balance photoelectric detector, a photoelectric detector and the like. Themethod comprises the following steps of: performing phase modulation and signal amplitude modulation to be operated on two paths of pulse strings; frequency spectrum information to be operated is obtained under the time domain Talbert effect, then a frequency domain real part and an imaginary part of a signal correlation result are obtained through a 90-degree optical mixer, finally IQ modulationis carried out on a new pulse string, and a signal bearing the time domain correlation result is obtained through the time domain Talbert effect again. According to the method, the time domain Talberteffect of light is applied, correlation operation of signals is achieved through discrete Fourier transform of the signals and the 90-degree optical mixer, and the method has the advantages that theoperation speed is high, the result error is small, and the processing bandwidth is large by adopting the light method.

Description

technical field [0001] The invention belongs to the technical fields of communication, calculation and radar, and in particular relates to an optical domain cross-correlation calculation method and device based on the Talbot effect. Background technique [0002] The Talbot effect is a special Fresnel diffraction phenomenon, which is a phenomenon in which coherent light realizes self-imaging in free space under certain conditions, and this phenomenon exists in both the time domain and the frequency domain. Among them, the fractional time-domain Talbot effect can realize the Fourier transform function in the optical fiber with a specific dispersion amount, and the Fourier transform is an important method for analyzing signal spectrum information in communication. Therefore, the fractional Talbot effect has many application inventions in optical communication technology, such as the application of the self-imaging effect to realize the multiplication of the burst frequency, and...

Claims

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Application Information

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IPC IPC(8): G06F17/14H04B10/516
CPCG06F17/141H04B10/5161Y02D30/70
Inventor 周鸿博池灏杨淑娜欧军翟彦蓉杨波
Owner HANGZHOU DIANZI UNIV
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