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Freely tunable dual-passband microwave photonic filter device and implementation method

A microwave photon and filter technology, applied in optical fiber transmission, electromagnetic transmitter, electromagnetic wave transmission system, etc., can solve the problems of passband shape and bandwidth change, inability to realize passband free tuning, poor passband stability, etc.

Active Publication Date: 2021-09-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the tunable dual-passband microwave photonic filter schemes that have been reported so far have more or less the following problems: first, the stability of the passband is poor; Large changes occur; third, free tuning of the two passbands cannot be achieved

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  • Freely tunable dual-passband microwave photonic filter device and implementation method
  • Freely tunable dual-passband microwave photonic filter device and implementation method
  • Freely tunable dual-passband microwave photonic filter device and implementation method

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Embodiment 1

[0044] according to figure 1 The structure shown, using figure 2 (a) The principle shown realizes a freely tunable dual-passband microwave photonic filter based on Brillouin absorption spectroscopy. The light source is a DFB narrow linewidth laser with a central wavelength of 1549.97nm. The operating bandwidth of the electro-optical phase modulator is 10GHz. The operating bandwidth of the two dual-parallel Mach-Zehnder EO modulators is 40 GHz. The length of the highly nonlinear optical fiber is 1km, and the Brillouin frequency shift is 9.644GHz. The output frequency ranges of the two microwave sources are 100kHz-12.75GHz and 100kHz-40GHz respectively. The operating bandwidth of the photodetector is 20GHz. In the experiment, a vector network analyzer is used to test the filter performance of the present invention, and its sweep frequency range is 10MHz-50GHz, and the radio frequency output terminal and the radio frequency input terminal of the vector network analyzer are ...

Embodiment 2

[0049] according to figure 1 The structure shown, using figure 2 (b) The principle shown realizes a freely tunable dual-passband microwave photonic filter based on Brillouin gain spectrum. The device used in the experiment is identical with embodiment 1, adopts vector network analyzer to test the filter performance of the present invention in the experiment, and its frequency sweep range is 10MHz-50GHz, and the radio frequency output end and the radio frequency input end of vector network analyzer are respectively connected A radio frequency signal input terminal and a radio frequency signal output terminal of the microwave photon filter.

[0050] In the experiment, the output frequency f of the second microwave source is fixed m , by adjusting the output frequency f' of the first microwave source, the tuning of the filter output passband spacing can be realized. Figure 5 gives f m When =5GHz, f' are 6.5GHz, 7GHz, 7.5GHz, 8GHz, 8.5GHz and 9GHz respectively, the frequency...

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Abstract

The invention belongs to the field of optoelectronic technology, and in particular relates to a freely tunable double-passband microwave photon filter device and a realization method based on stimulated Brillouin scattering. The present invention adopts a laser, realizes the conversion from phase modulation to intensity modulation by means of Brillouin absorption spectrum or gain spectrum, and realizes the free setting of two passband positions by setting the output frequency of two microwave sources. A freely tunable dual-passband filter with narrow bandwidth, high rejection ratio and high stability is realized in it.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a freely tunable double-passband microwave photon filter device and a realization method based on the stimulated Brillouin scattering effect. Background technique [0002] Traditional microwave filters implement filtering in the electrical domain through single or multiple coupled resonators, and the passband tuning is poor, which cannot meet the application requirements of some radio frequency systems for wide-band tuning. The microwave photonic filter modulates the electrical signal onto the light wave, processes the signal in the optical domain, and then converts it back to the electrical domain to obtain the filtered electrical signal, which effectively overcomes the problem of poor tuning of the microwave filter in the electrical domain, and has a wide-band work , reconfigurable, and anti-electromagnetic interference, it is one of the powerful alternatives to solve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2507H04B10/50H04B10/516
CPCH04B10/2507H04B10/5051H04B10/5161
Inventor 曾珍张旨遥李政凯刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA