Broadband noise source generating device and signal generating method thereof

A broadband noise and generating device technology, applied in the field of communication, can solve the problem that the noise power cannot meet the power requirements of the noise generator, etc., and achieve the effects of increasing the output bandwidth and output power, broadband signal output, and increasing the output bandwidth.

Inactive Publication Date: 2020-02-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the noise power output by the existing noise generator cannot meet the power requirement of the noise generator, the present invention provides a broadband noise source generation device and a signal generation method thereof

Method used

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  • Broadband noise source generating device and signal generating method thereof
  • Broadband noise source generating device and signal generating method thereof
  • Broadband noise source generating device and signal generating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, a generation device of a broadband noise source includes a random laser 1, a filter shaping module 2, an optical amplifier 3, an optical attenuator 4, and a photodetector 5, and the output end of the random laser 1 is connected to the filter shaping module 2. Input terminal, the output terminal of the filter shaping module 2 is connected to the input terminal of the optical amplifier 3, the output terminal of the optical amplifier 3 is connected to the input terminal of the optical attenuator 4, and the output terminal of the optical attenuator 4 is connected to the photodetector 5, the output end of the photodetector 5 is used as the output end of the generating device of the broadband noise source.

[0027] Among them, such as figure 2 As shown, the filtering and shaping module includes a circulator 211, a first concave lens 212, a second concave lens 214, a grating 213, and a liquid crystal on silicon optical processor 215; the optical si...

Embodiment 2

[0030] Such as figure 1As shown, a device for generating a broadband noise source includes a random laser 1, a filter shaping module 2, an optical amplifier 3, an optical attenuator 4, and a photodetector 5. The output end of the random laser 1 is connected to the filter shaping module 2, The output end of the filter shaping module 2 is connected to the input end of the optical amplifier 3, the output end of the optical amplifier 3 is connected to the input end of the optical attenuator 4, and the output end of the optical attenuator 4 is connected to the input of the photodetector 5 terminal, the output terminal of the photodetector 5 is used as the output terminal of the generating device of the broadband noise source.

[0031] Among them, such as image 3 As shown, the filtering and shaping module includes an optical signal input end, a first convex lens 221, ten transmission F-P interferometers 222, a second convex lens 223, and an optical signal output end arranged in se...

Embodiment 3

[0034] A method for generating a broadband noise source based on the device for generating a broadband noise source in Embodiment 1 or Embodiment 2 above, wherein the random laser 1 emits laser light under weak scattering conditions, and enters the filter shaping module 2 for spectral filtering Shaping to obtain an optical signal with a smooth spectrum and a standard Gaussian energy distribution, the optical signal is input into the optical amplifier 3 for amplification and then enters the optical attenuator 4, and the optical signal power is adjusted by the optical attenuator 4 control, the output of the optical attenuator 4 enters the photodetector 5 and converts the spectrum and the electric spectrum to output a broadband electrical noise signal.

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Abstract

The invention discloses a broadband noise source generating device and a signal generating method thereof. A random laser is used as a broadband noise source; due to the fact that the light-emitting principle is from amplified spontaneous radiation, the spectral bandwidth is far larger than that of a common laser light source, broadband signal output is achieved under the condition that random noise characteristics of output signals are guaranteed, the over-noise ratio of the output noise signals reaches 20 dB, and the output bandwidth and the output power of the noise generator are remarkablyimproved. A filtering and shaping module is arranged to accurately shape the spectrum output by the random laser and eliminate an emission peak in the spectrum, so that the flatness of the convertedspectrum is not greater than + / -6dB; meanwhile, self-convolution with the spectrum shape is known to be finally obtained, the spectrum with energy distribution meeting standard Gaussian distribution can be obtained by filtering the spectrum, the finally obtained spectrum is smoother, and the output noise signal amplitude can be continuously tuned by matching with an optical amplifier and an optical attenuator.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a device for generating a broadband noise source and a method for generating a signal thereof. Background technique [0002] A noise generator is a device that can generate noise in a specific frequency band. Its output power is continuously controllable and its noise power spectral density is uniform and flat. It is an indispensable test instrument for measuring noise figure. By inputting accurate and known noise to the device, module or system under test, it is possible to measure receiver sensitivity, evaluate antenna performance, analyze amplifier parameters, calibrate radiometer output, test radar anti-jamming ability, etc. Therefore, the noise generator is a A special scientific instrument that has important uses in many fields such as communications, remote sensing, military affairs, and astronomy. [0003] Existing noise generators are divided into those using ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50
CPCH04B10/503H04B10/505
Inventor 高震森王云才秦玉文孙粤辉郭亘立
Owner GUANGDONG UNIV OF TECH
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