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A high-power broadband ultra-flat microwave frequency comb generating device and method thereof

A microwave frequency and generation device technology, applied in the direction of solid-state lasers, etc., can solve the problems of microwave frequency comb spectrum narrow bandwidth, low spectrum flatness, and few frequency components, and achieve wide bandwidth, good flatness, and high power level Effect

Active Publication Date: 2018-12-11
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing microwave frequency comb schemes, the generated microwave frequency comb has narrow spectral bandwidth, fewer frequency components, lower spectral flatness, and lower power. These problems need to be solved

Method used

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  • A high-power broadband ultra-flat microwave frequency comb generating device and method thereof
  • A high-power broadband ultra-flat microwave frequency comb generating device and method thereof
  • A high-power broadband ultra-flat microwave frequency comb generating device and method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] After the light output by the light source passes through the optical coupler and is injected into the cascaded MZM modulator driven by the RF drive signal, the phase difference between the two Mach-Zehnder modulators is set to -90°, and both Mach-Zehnder modulators work At the minimum bias point, two lights with equal power can be generated; the erbium (Er) ion doping concentration of the erbium-doped fiber amplifier EDFA is 10 25 / m 3 , the pump power is 980mW, and the length is 5.6m, which is used to compensate the loss of the optical signal and amplify the power of the new frequency spectral line to the level of the seed light source. The amplified new spectral line is coupled with the seed light source to form a new light source spectrum. After several iterative cycles, the obtained optical comb is injected into the beat frequency of the PD, and a microwave frequency comb with a frequency spacing of 20GHz, a spectral bandwidth of 300GHz, and a flatness of 1.2dB is...

Embodiment 2

[0037] Other parameters remain unchanged, set the frequency of the driving RF signal to 20GHZ to obtain a microwave frequency comb with a frequency spacing of 40GHz, a spectral bandwidth of 300GHz, and a flatness of 0.11dB, see Figure 3(a) and Figure 3(b).

[0038] Change the power of the light source to -20dBm, the pumping power of the erbium-doped fiber amplifier EDFA to 70mW, the length to 5.6m, and set the frequency of the driving RF signal to 20GHZ to obtain a microwave with a frequency spacing of 40GHz, a spectral bandwidth of 300GHz, and a flatness of 0.12dB Frequency comb, see Figure 4(a) and Figure 4(b).

[0039] In summary, the present invention uses cascaded MZM modulators in a loop to generate a broadband ultra-flat microwave frequency comb, which has a simple structure and is easy to operate. The microwave frequency comb produced has good spectral characteristics. It has both advantages in flatness and flatness, and can be used in high-speed wireless communication...

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Abstract

The invention discloses a high-power broadband ultra-flat microwave frequency comb generating device and a method thereof, the generating device comprises a tunable laser source, an optical coupler, aphotodetector, a radio frequency spectrum analyzer, a radio frequency signal source, a cascaded first Mach-Zehnder modulator and a cascaded second Mach-Zehnder modulator, a band pass filter and an optical amplifier, the radio frequency signal source providing a driving voltage to the cascaded first Mach-Zehnder modulator and the cascaded second Mach-Zehnder modulator. The invention has the advantages of wide band range, high power level, good flatness and the like, and the generated microwave frequency comb has good spectrum characteristics, has advantages in spectrum bandwidth and flatness,and can be used in high-speed wireless communication and satellite transponder system. The invention is based on the optical loop of the cascaded MZM modulator, and only needs to change the RF drivingsignal RF so as to obtain the microwave frequency comb with different spacing, and the structure is very simple.

Description

technical field [0001] The invention relates to a high-power broadband ultra-flat microwave frequency comb generating device and a method thereof, belonging to the optical generation technical field of microwave frequency combs. Background technique [0002] From the perspective of signal generation, a high-quality microwave signal source is the basis for all applications in the microwave field. Therefore, the generation technology of high-purity, low phase noise and tunable microwave signals has become a research hotspot at present. Compared with a single-frequency microwave source, a microwave frequency comb (MFC, Microwave Frequency Comb, composed of a series of discrete microwave signals with equal frequency intervals, which can simultaneously provide multiple microwave signals of different frequencies in one frequency band) has a large number of spectral lines, With the advantages of wide frequency range and high precision of spectral line spacing, it has been widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 李培丽张丰
Owner NANJING UNIV OF POSTS & TELECOMM
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