Apparatus and method for optical real-time Fourier transform with complex-valued output

A Fourier transform and complex number technology, applied in the field of microwave photonics, can solve the problem of ignoring the spectral phase information of the target signal, and achieve the effect of easy signal processing, simple structure, and avoiding electromagnetic interference.

Active Publication Date: 2022-03-08
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, most current methods only characterize the amplitude variation of the generated Fourier transform signal, while ignoring the phase information of the target signal spectrum

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  • Apparatus and method for optical real-time Fourier transform with complex-valued output

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Embodiment Construction

[0026] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings:

[0027] Such as figure 1 As shown, the present embodiment has an optical real-time Fourier transform device with complex-valued output, including a mode-locked laser 1, a first section of dispersive fiber 2, a Mach-Zehnder modulator 3, a second section of dispersive fiber 6, and a continuous Wave laser, 90-degree optical mixer 8, first balanced photodetector 9, second balanced photodetector 10.

[0028] The optical signal generated by the mode-locked laser 1 is a pulse signal with a small time width and a large frequency domain bandwidth, so as to ensure accurate follow-up processing.

[0029] Mode-locked laser 1, the first section of dispersive fiber 2, Mach-Zehnder modulator 3, and the second section of dispersive fiber 6 are sequentially connected through optical fiber...

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Abstract

The invention discloses an optical real-time Fourier transform device and method with complex value output. The device includes a mode-locked laser, a first section of dispersion fiber, a Mach-Zehnder modulator, a second section of dispersion fiber, a continuous wave laser, The 90-degree optical hybrid, the first balanced photodetector, and the second balanced photodetector; the mode-locked laser, the first section of dispersive fiber, the Mach-Zehnder modulator, and the second section of dispersive fiber are connected sequentially through optical fibers, and the signal is transmitted from One input port of the 90-degree optical hybrid is input; the continuous optical signal generated by the continuous wave laser is input from the other input port of the 90-degree optical hybrid. The four-way signals output by the 90-degree optical hybrid are divided into two groups and enter the second A balanced photodetector and a second balanced photodetector. The invention has a simple structure and is beneficial for integrated use in the future; the optical fiber is used as a transmission medium to avoid external electromagnetic interference to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of microwave photonics, and in particular relates to a technology using photonics to realize real-time characterization of the frequency spectrum of any electrical signal, thereby retaining the information amount of the signal frequency spectrum to a great extent. Background technique [0002] Fourier transform is an important algorithm in the field of signal processing. For arbitrary waveform signals, it can be generated by the superposition of different sinusoidal waveforms. In the frequency domain, it can be regarded as the superposition of different spectral lines. Fourier transform is to convert the time-domain signal that is difficult to analyze or process into an easy-to-process frequency-domain signal, which can intuitively show the characteristics of various signals, that is, the frequency structure of the signal and the information of each harmonic and phase, and can be obtained by using Some tools...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/077
CPCH04B10/077
Inventor 张裕康池灏杨淑娜杨波翟彦蓉欧军
Owner HANGZHOU DIANZI UNIV
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