CN110971193A - Millimeter wave noise signal generator based on FP chaotic laser - Google Patents
Millimeter wave noise signal generator based on FP chaotic laser Download PDFInfo
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- H—ELECTRICITY
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- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
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Abstract
本发明涉及一种基于FP混沌激光的毫米波噪声信号发生器。所述发生器包括：混沌光信号输出器、光谱整形模块、耦合器、光电探测器；所述的混沌光信号输出器和光谱整形模块分别含有若干个；混沌光信号输出器输出混沌光信号；不同混沌光信号输出器输出波长不同的混沌光信号；光谱整形模块将不同波长的混沌光信号作为噪声信号进行选频和整形；选出的两路不同波段的噪声信号再通过耦合器进行拍频，拍频后的信号通过光电探测器实现光谱‑电谱的转换，最终输出大功率、宽带宽的毫米波电噪声。本发明可以产生噪声谱更平坦、带宽更宽的噪声信号。
The invention relates to a millimeter wave noise signal generator based on FP chaotic laser. The generator includes: a chaotic optical signal output device, a spectral shaping module, a coupler, and a photodetector; the chaotic optical signal output device and the spectral shaping module respectively contain several; the chaotic optical signal output device outputs a chaotic optical signal; Different chaotic optical signal output devices output chaotic optical signals with different wavelengths; the spectral shaping module uses the chaotic optical signals of different wavelengths as noise signals for frequency selection and shaping; the selected two channels of noise signals with different bands are then beat frequency through the coupler , the signal after the beat frequency is converted from the spectrum to the electric spectrum by the photodetector, and finally the high-power, wide-bandwidth millimeter-wave electrical noise is output. The invention can generate a noise signal with a flatter noise spectrum and wider bandwidth.
Description
Technical Field
The invention relates to the field of noise generators, in particular to a millimeter wave noise signal generator based on FP chaotic laser.
Background
Noise is an inevitable interference source, exists in various fields of information space, and is an indispensable requirement for a noise generator in order to better control the influence caused by the noise, no matter whether the device is developed or the system is built. Noise is currently generated mainly by two approaches, digital synthesis and physical noise source amplification.
The digital synthesis mode is to generate a plurality of pseudo-random number sequences through an algorithm, and then convert the pseudo-random number sequences into white noise in a time domain-frequency domain mode. This approach is often limited by the clock frequency of the electronics, making it difficult to generate noise signals above GHz.
By means of amplifying and controlling the noise generated by the physical device, the frequency upper limit can be greatly increased without being limited by the clock frequency. For example, in the subject group taught by sheep happy in China, a noise source with the working frequency of 90-100 GHz is developed by using the noise radiation which can change when the temperature of the resistor changes. For example, Ehsan et al in the United states space and space administration utilizes a Schottky diode to realize millimeter wave noise output in a 160-200 GHz wave band. Experiments prove that the millimeter-wave noise signal generating circuit can be used for generating millimeter-wave noise signals by using resistors, diodes and field effect transistors as noise sources, but has the difficulty which is difficult to overcome, and mainly reflects that the power of output noise is relatively low and is difficult to use in many occasions. With the development of photonic technology, researchers are also striving to generate millimeter wave noise by photonic methods, such as the filtering and photoelectric conversion of spontaneous emission ASE noise of erbium-doped fiber amplifiers by Song et al, japan telecom, and the like, to generate uniform noise signals, which have been experimented to generate 100GHz noise signals. And as the teaching of the meaning forest of Shanghai traffic university and the teaching of the Charlotron of southwest university cooperate, the flat chaotic noise with the bandwidth of more than 30GHz is generated by utilizing the weak oscillation cavity FP laser. However, the noise signal generated by the current photon method has the disadvantages of small output power or narrow bandwidth.
Disclosure of Invention
The invention provides a millimeter wave noise signal generator based on FP chaotic laser, aiming at overcoming the defect that the bandwidth of the noise generator in the prior art is not wide enough.
The generator comprises: the device comprises a chaotic light signal output device, a spectrum shaping module, a coupler and a photoelectric detector;
the chaotic light signal output device and the spectrum shaping module respectively comprise a plurality of chaotic light signal output devices;
the chaotic light signal output device outputs a chaotic light signal; the different chaotic light signal output devices output chaotic light signals with different wavelengths; each chaotic light signal output device is connected with a spectrum shaping module;
the spectrum shaping module takes the chaotic light signals with different wavelengths as noise signals to carry out frequency selection and shaping; the selected two paths of noise signals with different wave bands are subjected to beat frequency through a coupler, the signals after beat frequency are subjected to spectrum-electric spectrum conversion through a photoelectric detector, and finally millimeter wave electric noise with high power and wide bandwidth is output.
Preferably, the chaotic light signal output device and the spectrum shaping module respectively comprise 2 chaotic light signal output devices and 2 spectrum shaping modules.
Preferably, the chaotic light signal output device comprises: FP laser, beam splitter, optical attenuator, optical feedback device;
the FP laser emits an optical signal which is a multi-longitudinal-mode optical signal and is divided into two parts by the optical splitter, namely two beams of light, one part of the light is output to the spectrum shaping module, and the other part of the light is attenuated by the attenuator and then fed back to the interior of the FP laser by the optical feedback device, so that the FP laser outputs a chaotic optical signal.
The attenuation value of the attenuator is generally about 10dB, preferably 10 dB.
Preferably, the optical feedback is a fiber optic feedback mirror.
Preferably, the spectral shaping module is a programmable optical filter.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention adopts chaotic light generated by the feedback of the FP laser external cavity as a signal source, is not limited by the electronic bandwidth compared with the existing electric noise generator, greatly improves the upper limit of the working frequency, and can obtain a high-power noise signal compared with an ASE noise generator.
The chaotic light generated by the FP laser external cavity feedback is used as a signal source, and compared with other lasers generating the chaotic light, the chaotic light source has the advantages of lower cost and wider application range.
The invention adopts two paths of chaotic light signals to carry out beat frequency processing, and can generate noise signals with flatter noise spectrum and wider bandwidth.
Drawings
Fig. 1 is a schematic diagram of a millimeter wave noise signal generator based on FP chaotic laser in embodiment 1.
Wherein, 1.1 and 1.2 are FP lasers, 2.1 and 2.2 are optical splitters, 3.1 and 3.2 are optical attenuators, 4.1 and 4.2 are optical feedback devices, 5.1 and 5.2 are spectrum shaping modules, 6 is an optical coupler, and 7 is a photoelectric detector.
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:
the embodiment provides a millimeter wave noise signal generator based on FP chaotic laser, as shown in fig. 1, the generator includes: the chaotic light signal output device, the spectrum shaping modules 5.1 and 5.2, the coupler 6 and the photoelectric detector 7;
the chaotic light signal output device and the spectrum shaping modules 5.1 and 5.2 respectively comprise a plurality of chaotic light signal output devices;
the chaotic light signal output device outputs a chaotic light signal; the different chaotic light signal output devices output chaotic light signals with different wavelengths;
the spectrum shaping modules 5.1 and 5.2 select and shape the frequency of the chaotic optical signals with different wavelengths as noise signals; the selected two paths of noise signals with different wave bands are subjected to beat frequency through the coupler 6, the beat frequency signals are subjected to spectrum-electric spectrum conversion through the photoelectric detector 7, and finally millimeter wave electric noise with high power and wide bandwidth is output.
The chaotic light signal output device and the spectrum shaping modules 5.1 and 5.2 respectively comprise 2 chaotic light signal output devices and 2 spectrum shaping modules.
The chaotic light signal output device comprises: FP lasers 1.1, 1.2, optical splitters 2.1, 2.2, optical attenuators 3.1, 3.2, optical feedback devices 4.1, 4.2;
optical signals emitted by the FP lasers 1.1 and 1.2 are divided into two beams of light by the optical splitters 2.1 and 2.2, one part of the light is output to the spectrum shaping modules 5.1 and 5.2, and the other part of the light is attenuated by the attenuators 3.1 and 3.2 and then fed back to the interior of the FP lasers 1.1 and 1.2 by the optical feedback devices 4.1 and 4.2, so that the FP lasers 1.1 and 1.2 output chaotic optical signals.
The attenuation values of the attenuators 3.1, 3.2 are: 10 dB.
The optical feedback devices 4.1, 4.2 are fiber feedback mirrors.
The spectrum shaping module is a programmable optical filter.
In the specific implementation process, light signals emitted by the FP lasers 1.1 and 1.2 are divided into two beams of light through the optical splitters 2.1 and 2.2, one part of the light is attenuated by the attenuators 3.1 and 3.2 and then fed back to the insides of the FP lasers 1.1 and 1.2 by the feedback mirror, so that the FP lasers 1.1 and 1.2 output chaotic light signals, the other paths of the FP lasers 1.1 and 1.2 also pass through the same structure but output chaotic light signals with different wavelengths, and the obtained chaotic light is used as a noise signal; frequency selection and shaping are respectively carried out on the noise signals of each path through the spectrum shaping modules 5.1 and 5.2, the selected noise signals of two paths of different wave bands are subjected to beat frequency through the coupler 6, spectrum-electric spectrum conversion is realized on the beat frequency signals through the photoelectric detector 7, and finally millimeter wave electric noise with high power and wide bandwidth is output.
The same or similar reference numerals correspond to the same or similar parts;
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. A millimeter wave noise signal generator based on FP chaotic laser is characterized by comprising: the device comprises a chaotic light signal output device, a spectrum shaping module, a coupler and a photoelectric detector;
the chaotic light signal output device and the spectrum shaping module respectively comprise a plurality of chaotic light signal output devices; each chaotic light signal output device is connected with a spectrum shaping module;
the chaotic light signal output device outputs a chaotic light signal; the different chaotic light signal output devices output chaotic light signals with different wavelengths;
the spectrum shaping module takes the chaotic light signals with different wavelengths as noise signals to carry out frequency selection and shaping; the selected two paths of noise signals with different wave bands are subjected to beat frequency through a coupler, the signals after beat frequency are subjected to spectrum-electric spectrum conversion through a photoelectric detector, and finally millimeter wave electric noise with high power and wide bandwidth is output.
2. The FP chaotic laser based millimeter wave noise signal generator according to claim 1, wherein the chaotic light signal output device and the spectrum shaping module respectively comprise 2.
3. The FP chaotic laser-based millimeter wave noise signal generator according to claim 1 or 2, wherein the chaotic light signal output device comprises: FP laser, beam splitter, optical attenuator, optical feedback device;
an optical signal emitted by the FP laser is divided into two parts by the optical splitter, one part of light is output to the spectrum shaping module, and the other part of light is attenuated by the attenuator and then fed back to the interior of the FP laser by the optical feedback device, so that the FP laser outputs a chaotic optical signal.
4. The FP-chaotic laser-based millimeter wave noise signal generator according to claim 3, wherein the attenuation value of the attenuator is 10 dB.
5. The FP chaotic laser based millimeter wave noise signal generator according to claim 4, wherein the optical feedback device is an optical fiber feedback mirror.
6. The FP-chaotic-laser-based millimeter wave noise signal generator according to claim 4 or 5, wherein the spectrum shaping module is a programmable optical filter.
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Cited By (3)
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| WO2020216346A1 (en) * | 2019-04-26 | 2020-10-29 | 太原理工大学 | Ultra-wideband white noise source |
| CN112436806A (en) * | 2020-10-10 | 2021-03-02 | 广东工业大学 | Millimeter wave noise signal generating device and generating method |
| CN113644981A (en) * | 2021-06-24 | 2021-11-12 | 广东工业大学 | System and method for generating millimeter wave noise with flat frequency spectrum |
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