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Method for generating ultra-wideband multi-band frequency microwave signal

A microwave signal and generation method technology, applied in electromagnetic wave transmission systems, electromagnetic transmitters, electrical components, etc., can solve the problems of few frequency components, narrow and not many multi-band microwave signal spectrum bandwidths, etc., to achieve easy control, good Spectral characteristics, easy tuning effect

Active Publication Date: 2015-12-09
南京云巅电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are not many technologies for generating multi-band microwave signals using light, and the generated multi-band microwave signals have narrow spectral bandwidth and fewer frequency components.

Method used

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  • Method for generating ultra-wideband multi-band frequency microwave signal
  • Method for generating ultra-wideband multi-band frequency microwave signal
  • Method for generating ultra-wideband multi-band frequency microwave signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. After the light source is modulated by FM1 and FM2, OFC1 and OFC2 with frequency spacing of 40 GHz and 20 GHz are generated respectively. After beating frequency, a multi-band microwave signal with a frequency spacing of 20 GHz, a spectral bandwidth of 300 GHz, and a good spectral line purity is obtained ( See attached figure 2 ).

[0032] 2. When the frequencies of RF1 and RF2 are set to f 1 =40GHz,f 2 = 20GHz; f 1 =30GHz, f 2 = 15GHz; f 1 =20GHz, f 2 = 10GHz; f 1 =10GHz,f 2 When =5GHz, the corresponding RF1 and RF2 frequency difference Δf is 20GHz, 15GHz, 10GHz and 5GHz successively, obtained the multi-band microwave signal that frequency interval is respectively 20GHz, 15GHz, 10GHz and 5GHz (see the image 3 ).

Embodiment 2

[0034] 3. Other parameters remain unchanged, and when the frequency offsets of FM1 and FM2 are set to 400GHz and 200GHz; 360GHz and 180GHz; 120GHz and 60GHz; 100GHz and 50GHz, four different multi-band microwave signals are generated. The spectral bandwidth of the output multi-band microwave signal increases as the frequency offset of the two FMs increases. When the FM frequency frequency offset increases to a certain value, the spectral bandwidth of the generated multi-band microwave signal remains unchanged. When the frequency offsets of FM1 and FM2 are 360GHz and 180GHz respectively, the spectrum envelope of the output multi-band microwave signal is the flattest, the average power is the highest, and the spectrum bandwidth is the largest (see attached Figure 4 ).

[0035] 4. When the input power of the light source is changed to 5dBm, 10dBm, 15dBm and 20dBm in turn, the average spectral power of the output multi-band microwave signal increases with the increase of the inp...

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Abstract

The invention discloses a method for generating an ultra-wideband multi-band frequency microwave signal. The method comprises the following steps that a laser diode (LD) is taken as an input light source, an optical signal of the laser diode is averagely divided into two parts by an optical power splitter, and the two parts are respectively injected into a first frequency modulator (FM1) and a second frequency modulator (FM2) to carry out frequency modulation; the first frequency modulator (FM1) and the second frequency modulator (FM2) are respectively driven by a first radio-frequency signal (RF1) with the frequency of f1 and a second radio-frequency signal (RF2) with the frequency of f2, so that a first optical frequency comb (OFC1) with the frequency space of f1 and a second optical frequency comb (OFC2) with the frequency space of f2 are generated; and the two optical frequency combs are injected together through a coupler, and after frequency mixing, the ultra-wideband multi-band frequency microwave signal with the frequency space of deltaf=absolute value of f1-f2 is generated through beat frequencies of the optical frequency combs. The ultra-wideband multi-band frequency microwave signal which is generated based on the beat frequencies of the optical frequency combs has advantages on the spectral bandwidth and the frequency component, and the frequency space is tunable.

Description

technical field [0001] The invention relates to the technical field of optically generated microwaves, in particular to an ultra-wideband multi-band microwave signal generation technology. Background technique [0002] Electromagnetic waves with a frequency range from 300MHz to 3000GHz are called microwave signals, and the corresponding wavelength range is from 0.1mm to 100cm. As a commonly used wireless transmission medium, microwave has been widely used in radar, remote sensing, satellite communication broadband, wireless access network and other fields. [0003] The generation of high-purity, tunable microwave signals has become a major research hotspot at present. There are many deficiencies and limitations in the traditional technology of generating microwave signals electrically, so it is difficult to generate high-frequency and stable microwave signals in the electric domain. The photo-generated microwave method can effectively overcome the "electronic bottleneck". ...

Claims

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Application Information

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IPC IPC(8): H04B10/548H04B10/50
Inventor 李培丽邵茜
Owner 南京云巅电子科技有限公司
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