CN110768668A - Photon noise signal generator and signal generating method thereof - Google Patents
Photon noise signal generator and signal generating method thereof Download PDFInfo
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Abstract
The invention discloses a photon noise signal generator and a signal generating method thereof, the photon noise signal generator comprises a chaotic laser, a spectrum shaping module, an optical amplifier, an optical attenuator and a photoelectric detector, the chaotic laser outputs chaotic broad-spectrum light and enters the spectrum shaping module through an optical fiber, the spectrum shaping module performs spectrum shaping on the chaotic broad-spectrum light and then outputs broad-spectrum noise, the broad-spectrum noise enters the optical attenuator through the optical fiber after being amplified by an input optical amplifier, the optical signal power of the broad-spectrum noise is controlled by the optical attenuator, and the output of the optical attenuator enters the photoelectric detector through a metal waveguide and performs spectrum and electric spectrum conversion so as to output microwave electric noise. The photon noise signal generator utilizes the chaotic laser as a signal source, can generate broadband noise compared with an electric noise generator, simultaneously has larger signal amplitude compared with ASE amplification, generates a wide-spectrum chaotic signal, and has the bandwidth reaching dozens of gigahertz to one hundred gigahertz.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a photon noise signal generator and a signal generating method thereof.
Background
A noise generator is a device capable of outputting uniform and continuous determined power noise in a specific frequency band. Noise is a major source of interference in the field of electronics and communications, and therefore becomes an important test instrument in the field of radar, communications, and the like. With the development of radar and wireless communication technologies, the requirements for noise generators are also higher and higher, and high frequencies and large bandwidths are required.
The digital synthesis technology is to generate a pseudo-random number sequence by using DSP or FPGA through algorithms such as a linear congruence method, a shift register method and the like, and then to perform time domain-frequency mapping on the pseudo-random number sequence to convert the pseudo-random number sequence into Gaussian white noise, but the digital synthesis technology is limited by the clock frequency of a device, and the noise frequency generated by the digital synthesis method is generally lower than GHz.
The physical noise source amplification technology is to construct a noise generator by amplifying and controlling noise in a physical device, and the main devices of the noise generator are as follows: resistors, saturable diodes, gas discharge diodes, schottky diodes, field effect transistors, etc., but similarly, their frequency range is still lower than the operating frequency of some devices under test.
The broadband noise generated by photons can break through the bottleneck of electronic bandwidth, and the Amplified Spontaneous Emission (ASE) noise spectrum in the erbium-doped fiber amplifier is filtered by japanese telecommunication corporation (NTT) (ieee.micro.thermal tech.,56(12),2989-2997, 2008), and uniform microwave electrical noise is generated through photoelectric conversion from the spectrum to the spectrum, but the ASE optical noise power of the erbium-doped fiber amplifier is low, and the filtered ASE optical noise is more difficult to be practical. The National Institute of Standards and Technology (NIST) originally proposed the concept of white noise generation using chaotic light (j.appl.phys.,86(10), 5794-. The macro chaotic oscillation is used for replacing the micro noise to generate high-power white noise, but the defect of narrow spectrum range of a noise power spectrum exists.
In summary, the current noise generator mainly has the problems of insufficient bandwidth, low ultra-noise ratio and the like, for example, the frequency of the noise generated by a digital synthesis method is generally lower than GHz, and the amplification of a physical noise source has the problems of refrigeration, large volume, low output power and the like, and is difficult to be applied in practice. The problem of small output power of noise signals such as ASE spectrum filtering generated by a photon method exists, high-power white noise can be generated by replacing micro noise with macroscopic chaotic oscillation, but the frequency range of a noise power spectrum is narrow, and meanwhile, the extreme phenomenon also exists in the development of a noise generator: the low-frequency noise generator is mature in technology and low in threshold; millimeter-wave band noise generators are difficult to implement.
Disclosure of Invention
The invention provides a photon noise signal generator and a signal generating method thereof, aiming at solving the problems of insufficient noise power and narrow noise power spectrum range of the existing noise generator.
In order to achieve the above purpose, the technical means adopted is as follows:
a photon noise signal generator comprises a chaotic laser, a spectrum shaping module, an optical amplifier, an optical attenuator and a photoelectric detector, wherein the output end of the chaotic laser is connected with the input end of the spectrum shaping module, the output end of the spectrum shaping module is connected with the input end of the optical amplifier, the output end of the optical amplifier is connected with the input end of the optical attenuator, the output end of the optical attenuator is connected with the input end of the photoelectric detector, and the output end of the photoelectric detector is used as the output end of the photon noise signal generator to output a noise signal.
In the scheme, the chaotic laser is used as a signal source of the photon noise signal generator, compared with an electric noise generator, the chaotic laser can generate broadband noise, and in addition, compared with the conventional ASE amplification, the chaotic laser generates a larger signal amplitude.
Preferably, the chaotic laser is an optical feedback semiconductor laser.
Preferably, the chaotic laser is a semiconductor laser with an optical feedback device arranged outside.
Preferably, the optical feedback device is configured to increase external disturbance, and laser light output by the semiconductor laser device is fed back to the semiconductor laser device through the optical feedback device to be amplified to form optical oscillation, and output chaotic optical laser light.
Preferably, the spectrum shaping module is a programmable optical filter.
According to the photon noise signal generation method based on the photon noise signal generator, the chaotic laser outputs chaotic wide-spectrum light and enters the spectrum shaping module through an optical fiber, the spectrum shaping module performs spectrum shaping on the chaotic wide-spectrum light and then outputs wide-spectrum noise, the wide-spectrum noise is input into the optical amplifier and then enters the optical attenuator through the optical fiber after being amplified, the optical signal power of the optical attenuator is controlled through the optical attenuator, and the output of the optical attenuator enters the photoelectric detector through the metal waveguide and performs spectrum and electric spectrum conversion so as to output microwave electric noise.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the photon noise signal generator utilizes the chaotic laser as a signal source, can generate broadband noise compared with an electric noise generator, simultaneously has larger signal amplitude compared with an ASE amplification mode, generates wide-spectrum chaotic signals, has the bandwidth of dozens of gigahertz to one hundred gigahertz, and solves the problem that the bandwidth of the current noise generator is not wide enough.
In addition, the chaotic signal is shaped into a flat and symmetrical white noise signal by the spectrum shaper, so that the signal is more accordant with Gaussian white noise and is a more ideal spectrum.
Moreover, the optical signal is converted into a controllable electric signal after passing through the optical attenuator and the photoelectric detector, so that the amplitude of the output noise signal is continuously adjustable, the photon noise signal generator is easier to use in practice, and the photon noise signal generator has better practicability.
Drawings
FIG. 1 is a block diagram of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, a photon noise signal generator includes a chaotic laser 1, a spectrum shaping module 2, an optical amplifier 3, an optical attenuator 4 and a photodetector 5, an output end of the chaotic laser 1 is connected to an input end of the spectrum shaping module 2, an output end of the spectrum shaping module 2 is connected to an input end of the optical amplifier 3, an output end of the optical amplifier 3 is connected to an input end of the optical attenuator 4, an output end of the optical attenuator 4 is connected to an input end of the photodetector 5, and an output end of the photodetector 5 serves as an output end of the photon noise signal generator to output a noise signal.
The chaotic laser 1 is an optical feedback semiconductor laser, and an optical feedback device is arranged outside the semiconductor laser to increase a degree of freedom, namely external disturbance, so that the output of the semiconductor laser is fed back to the semiconductor laser through the optical feedback device to be amplified to form optical oscillation, and chaotic output, namely a chaotic laser source, is generated. The spectrum shaping module 2 is a programmable optical filter.
The working principle of the photon noise signal generator provided in this embodiment 1 is as follows:
the chaotic laser 1 outputs chaotic wide-spectrum light and enters the spectrum shaping module 2 through an optical fiber, the spectrum shaping module 2 performs spectrum shaping on the chaotic wide-spectrum light, the spectrum width of the chaotic wide-spectrum light is widened, noise is more flat, but due to the fact that the spectrum energy after the spectrum shaping is low, wide-spectrum noise output by the spectrum shaping module 2 is input into the optical amplifier 3 to be amplified, the amplified output enters the optical attenuator 4 through the optical fiber, the optical signal power is accurately controlled through the attenuation of the optical attenuator 4 to the transmission optical power, and finally the output of the optical attenuator 4 enters the photoelectric detector 5 through the metal waveguide and is subjected to spectrum and electric spectrum conversion, so that microwave electric noise is output.
The photon noise signal generator of this embodiment 1 utilizes the chaotic laser to generate the wide-spectrum chaotic signal, which is used as the signal source of the noise signal generator, so as to ensure the spectral width and the large amplitude relative to the ASE light source, and then utilizes the spectrum shaping module 2 to shape the chaotic signal to obtain the broadband noise signal, so that the signal better conforms to the white gaussian noise, the spectrum is flat and more ideal, and finally, the continuous adjustment of the amplitude of the noise signal is realized through the optical amplifier 3 and the optical filter. The photon noise signal generator generates wide-spectrum chaotic signals, the bandwidth can reach dozens of gigahertz to one hundred gigahertz, and the problem that the bandwidth of the current noise generator is not wide enough is solved.
Example 2
The present embodiment 2 provides a photon signal generating method based on the photon noise signal generator of the above embodiment 1: the chaotic laser 1 outputs chaotic wide-spectrum light and enters the spectrum shaping module 2 through an optical fiber, the spectrum shaping module 2 performs spectrum shaping on the chaotic wide-spectrum light and then outputs wide-spectrum noise, the wide-spectrum noise is input into the optical amplifier 3 to be amplified and then enters the optical attenuator 4 through the optical fiber, the optical attenuator 4 controls the optical signal power, and the output of the optical attenuator 4 enters the photoelectric detector 5 through a metal waveguide and performs spectrum and electric spectrum conversion so as to output microwave electric noise.
In addition, each component used in the above embodiments may be commercially available products, and the present invention is intended to protect their connection relationship and the implementation principle, and therefore, the model and the like of each product itself are not limited.
The terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. The photon noise signal generator is characterized by comprising a chaotic laser (1), a spectrum shaping module (2), an optical amplifier (3), an optical attenuator (4) and a photoelectric detector (5), wherein the output end of the chaotic laser (1) is connected with the input end of the spectrum shaping module (2), the output end of the spectrum shaping module (2) is connected with the input end of the optical amplifier (3), the output end of the optical amplifier (3) is connected with the input end of the optical attenuator (4), the output end of the optical attenuator (4) is connected with the input end of the photoelectric detector (5), and the output end of the photoelectric detector (5) serves as the output end of the photon noise signal generator to output a noise signal.
2. The photonic noise signal generator according to claim 1, wherein the chaotic laser (1) is an optical feedback semiconductor laser.
3. The photonic noise signal generator according to claim 1, wherein the chaotic laser (1) is a semiconductor laser with an optical feedback device placed outside.
4. The photonic noise signal generator according to claim 3, wherein the optical feedback device is configured to increase external disturbance, and the laser light output by the semiconductor laser is fed back to the semiconductor laser through the optical feedback device to be amplified to form optical oscillation and output chaotic optical laser light.
5. The photonic noise signal generator according to claim 1, wherein the spectral shaping module (2) is a programmable optical filter.
6. The photon noise signal generation method based on the photon noise signal generator according to any one of claims 1 to 5, characterized in that the chaotic laser (1) outputs chaotic broad spectrum light and enters the spectrum shaping module (2) through an optical fiber, the spectrum shaping module (2) performs spectrum shaping on the chaotic broad spectrum light and outputs broad spectrum noise, the broad spectrum noise is input to the optical amplifier (3) for amplification and then enters the optical attenuator (4) through the optical fiber, the optical attenuator (4) controls the optical signal power, and the output of the optical attenuator (4) enters the photoelectric detector (5) through a metal waveguide and performs spectrum and electric spectrum conversion so as to output microwave electrical noise.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541134A (en) * | 2020-03-30 | 2020-08-14 | 太原理工大学 | Photo-generated millimeter wave noise generator based on high nonlinear optical fiber |
| CN111555718A (en) * | 2020-03-30 | 2020-08-18 | 太原理工大学 | Ultra-wideband photo-generated millimeter wave noise generator |
| CN114024662A (en) * | 2021-12-21 | 2022-02-08 | 渔翁信息技术股份有限公司 | Random number generator |
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| CN101211087A (en) * | 2006-12-31 | 2008-07-02 | 华为技术有限公司 | Optical fibre amplifier and manufacture method and fiber communication system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541134A (en) * | 2020-03-30 | 2020-08-14 | 太原理工大学 | Photo-generated millimeter wave noise generator based on high nonlinear optical fiber |
| CN111555718A (en) * | 2020-03-30 | 2020-08-18 | 太原理工大学 | Ultra-wideband photo-generated millimeter wave noise generator |
| CN111541134B (en) * | 2020-03-30 | 2021-11-02 | 太原理工大学 | Photo-generated millimeter wave noise generator based on high nonlinear optical fiber |
| CN114024662A (en) * | 2021-12-21 | 2022-02-08 | 渔翁信息技术股份有限公司 | Random number generator |
| CN114024662B (en) * | 2021-12-21 | 2022-05-24 | 渔翁信息技术股份有限公司 | Random number generator |
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