阅读说明：本技术 一种光生毫米波噪声发生器 (Photo-generated millimeter wave noise generator ) 是由 李璞 李玮 王云才 蔡强 贾志伟 于 2020-03-30 设计创作，主要内容包括：本发明涉及一种光生毫米波噪声发生器,包括依序连接的混沌激光器,掺铒光纤放大器,第二偏振控制器,高非线性光纤(HNLF)以及高速光电探测器；其中,混沌激光器由半导体激光器,第一偏振控制器,60:40光纤耦合器,可调光衰减器以及光纤反射镜构成。本发明方案提供了一种毫米波噪声的光学产生技术,突破了电子带宽的瓶颈,实现方案结构简单且易于产生更大带宽的毫米波噪声；本发明的技术方案输出毫米波噪声的功率取决于掺铒光纤放大器的放大功率,相比于现有电子噪声源来讲,其输出功率易于调节而且可输出的最大功率更大；本发明的技术方案是由利用高非线性光纤中非线性效应及色散等联合作用实现毫米波噪声的产生,其产生毫米波噪声的频谱平坦,带宽更大。(The invention relates to a photo-generated millimeter wave noise generator, which comprises a chaotic laser, an erbium-doped fiber amplifier, a second polarization controller, a high nonlinear fiber (HNLF) and a high-speed photoelectric detector which are connected in sequence; the chaotic laser comprises a semiconductor laser, a first polarization controller, a 60:40 optical fiber coupler, a variable optical attenuator and an optical fiber reflector. The scheme of the invention provides an optical generation technology of millimeter wave noise, breaks through the bottleneck of electronic bandwidth, has simple structure and is easy to generate millimeter wave noise with larger bandwidth; the power of the millimeter wave noise output by the technical scheme of the invention depends on the amplification power of the erbium-doped fiber amplifier, and compared with the existing electronic noise source, the output power of the invention is easy to adjust and the maximum power which can be output is larger; the technical scheme of the invention is that the generation of millimeter wave noise is realized by utilizing the combined action of nonlinear effect, dispersion and the like in the high nonlinear optical fiber, the frequency spectrum of the generated millimeter wave noise is flat, and the bandwidth is larger.)

1. A photo-generated millimeter wave noise generator, comprising: the optical fiber polarization controller comprises a chaotic laser, an erbium-doped fiber amplifier, a second polarization controller, a high nonlinear fiber (HNLF) and a high-speed photoelectric detector which are connected in sequence; the chaotic laser comprises a semiconductor laser, a first polarization controller, a 60:40 optical fiber coupler, a variable optical attenuator and an optical fiber reflector, wherein the semiconductor laser, the first polarization controller and the 60:40 optical fiber coupler are sequentially connected, one end of the variable optical attenuator is connected with the optical fiber reflector, and the other end of the variable optical attenuator is connected with the 60:40 optical fiber coupler; the 60:40 optical fiber coupler is connected with the erbium-doped optical fiber amplifier;

after passing through a first polarization controller, laser output by a semiconductor laser of the chaotic laser is divided into two paths by an optical fiber coupler with a light splitting ratio of 60:40, wherein 40% of ports are connected with a variable optical attenuator and an optical fiber reflector to form a feedback structure; the variable optical attenuator and the first polarization controller enable feedback light to return to the interior of the semiconductor laser under appropriate intensity and polarization state to disturb the semiconductor laser, so that the semiconductor laser works in a chaotic oscillation state, and generated chaotic laser is output by a 60% port of the optical fiber coupler; the chaotic laser is input into the high-nonlinearity fiber through the second polarization controller when being amplified to a certain power through the erbium-doped fiber amplifier, and a final result is output after photoelectric conversion is carried out by the high-speed photoelectric detector; because the original chaotic laser signal enters the high nonlinear optical fiber after being amplified, the combination effect of nonlinear effect and dispersion is generated, the spectrum of the chaotic laser signal is obviously broadened, the spectrum bandwidth of the chaotic laser signal is enhanced, the final output presents the spectrum characteristic of millimeter wave noise, and the generation of the millimeter wave noise is realized.

2. The photo-generated millimeter wave noise generator of claim 1, wherein the chaotic laser implements chaotic laser generation through optical feedback, which is the simplest structure of chaotic laser generation.

3. The photo-generated millimeter wave noise generator of claim 1, wherein the erbium doped fiber amplifier is used to achieve amplification of the original chaotic laser and power regulation that ultimately produces millimeter wave noise.

4. The optical generated millimeter wave noise generator of claim 1, wherein the high nonlinearity fiber has a nonlinearity factor greater than10 W^-1km^-1After the chaotic laser passes through the high nonlinear optical fiber, nonlinear effect and dispersion effect occur, chaotic spectrum broadening is realized, the spectral bandwidth of chaotic signals is enhanced, and finally millimeter wave noise with flat spectrum is output.

Technical Field

The invention relates to the technical field of information security, in particular to a photo-generated millimeter wave noise generator.

Background

In radar systems, communication systems, and weapon guidance systems, a controllable noise source is required to detect the anti-noise interference capability in the system. Therefore, the noise generator is an important instrument for analyzing and calibrating the performance of the equipment. In communication and control systems, it is often necessary to utilize a noise generator to test the anti-interference performance of electronic devices, especially millimeter wave noise with uniform power density. Therefore, how to generate millimeter wave noise signals with continuously controllable output power and uniform and flat noise power spectral density has become an important research field.

Existing noise generators are generally classified into digital synthesis techniques and physical device noise amplification techniques. The digital synthesis technology is to generate a segment of pseudo-random number sequence by using DSP or FPGA through algorithms such as a linear congruence method and a shift register method, and then to convert the pseudo-random number sequence into noise by performing time domain-frequency mapping. The realization circuit is simple, convenient and practical, but is limited by the clock frequency of the device, the noise frequency generated by the mathematical synthesis technology is often lower than GHz, and the precision is poor. The noise amplification technology of the physical device is to control and amplify noise in physical devices such as a resistor, a saturation diode, a gas discharge diode, a schottky diode, a field effect transistor and the like, so as to generate actually usable noise. The technology can generate noise with larger bandwidth and has higher precision, but the realization circuit of the technology usually needs amplification and is more complex, and the flatness of the output noise power is deteriorated along with the increase of the bandwidth.

However, the operating frequencies of existing noise generators have not been satisfactory for some high frequency devices. How to output continuous random noise signals with flat frequency spectrum and stable and controllable power in a very wide frequency range (hundreds of GHz) has difficulties in many aspects of principles, technologies, processes and the like. Therefore, the millimeter wave noise generation with high bandwidth, uniform spectral density and adjustable output power is in need.

Disclosure of Invention

The present invention is directed to a photo-generated millimeter wave noise generator, which overcomes the above-mentioned shortcomings of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a photo-generated millimeter wave noise generator, which comprises a chaotic laser, an erbium-doped fiber amplifier, a second polarization controller, a high nonlinear fiber (HNLF) and a high-speed photodetector which are connected in sequence; the chaotic laser comprises a semiconductor laser, a first polarization controller, a 60:40 optical fiber coupler, a variable optical attenuator and an optical fiber reflector, wherein the semiconductor laser, the first polarization controller and the 60:40 optical fiber coupler are sequentially connected, one end of the variable optical attenuator is connected with the optical fiber reflector, and the other end of the variable optical attenuator is connected with the 60:40 optical fiber coupler; the 60:40 optical fiber coupler is connected with the erbium-doped optical fiber amplifier;

after passing through a first polarization controller, laser output by a semiconductor laser of the chaotic laser is divided into two paths by an optical fiber coupler with a light splitting ratio of 60:40, wherein 40% of ports are connected with a variable optical attenuator and an optical fiber reflector to form a feedback structure; the variable optical attenuator and the first polarization controller enable feedback light to return to the interior of the semiconductor laser under appropriate intensity and polarization state to disturb the semiconductor laser, so that the semiconductor laser works in a chaotic oscillation state, and generated chaotic laser is output by a 60% port of the optical fiber coupler; the chaotic laser is input into the high-nonlinearity fiber through the second polarization controller when being amplified to a certain power through the erbium-doped fiber amplifier, and a final result is output after photoelectric conversion is carried out by the high-speed photoelectric detector; because the original chaotic laser signal enters the high nonlinear optical fiber after being amplified, the combination effect of nonlinear effect and dispersion is generated, the spectrum of the chaotic laser signal is obviously broadened, the spectrum bandwidth of the chaotic laser signal is enhanced, the final output presents the spectrum characteristic of millimeter wave noise, and the generation of the millimeter wave noise is realized.

In the photo-generated millimeter wave noise generator, the chaotic laser realizes the generation of chaotic laser through optical feedback, and is the simplest structure for the generation of chaotic laser.

In the photo-generated millimeter wave noise generator, the erbium-doped fiber amplifier is used for realizing amplification of original chaotic laser and power regulation of finally generated millimeter wave noise.

In the photo-generated millimeter wave noise generator, the nonlinear coefficient of the high nonlinear optical fiber is more than 10W^-1km^-1After the chaotic laser passes through the high nonlinear optical fiber, nonlinear effect and dispersion effect occur, chaotic spectrum broadening is realized, the bandwidth of chaotic signals is enhanced, and finally millimeter wave noise with flat frequency spectrum is output.

The photo-generated millimeter wave noise generator provided by the invention has the advantages and positive effects that: the invention provides an optical generation technology of millimeter wave noise, breaks through the bottleneck of electronic bandwidth, has simple structure of the implementation scheme and is easy to generate millimeter wave noise with larger bandwidth; the power of the millimeter wave noise output by the technical scheme of the invention depends on the amplification power of the erbium-doped fiber amplifier, and compared with the existing electronic noise source, the output power of the invention is easy to adjust and the maximum power which can be output is larger; the technical scheme of the invention is that the generation of millimeter wave noise is realized by utilizing the combined action of nonlinear effect, dispersion and the like in the high nonlinear optical fiber, the frequency spectrum of the generated millimeter wave noise is flat, and the bandwidth is larger.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic structural diagram of a photo-generated millimeter wave noise generator provided by the present invention.

Fig. 2 is a diagram of experimental results of a photo-generated millimeter wave noise generator according to the present invention.

In the figure: 1: a semiconductor laser; 2: a first polarization controller; 3: 60:40 fiber coupler, 4: a variable optical attenuator; 5: a fiber optic mirror; 6: an erbium-doped fiber amplifier; 7: a second polarization controller; 8: high nonlinear fiber (HNLF); 9: high speed photodetectors.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1, the photo-generated millimeter wave noise generator of the present invention includes a chaotic laser, an erbium-doped fiber amplifier 6, a second polarization controller 7, a high nonlinear fiber (HNLF) 8 and a high-speed photodetector 9 connected in sequence; the chaotic laser comprises a semiconductor laser 1, a first polarization controller 2, a 60:40 optical fiber coupler 3, an adjustable optical attenuator 4 and an optical fiber reflector 5, wherein the semiconductor laser 1, the first polarization controller 2, the 60:40 optical fiber coupler 3 are sequentially connected, one end of the adjustable optical attenuator 4 is connected with the optical fiber reflector 5, and the other end of the adjustable optical attenuator 4 is connected with the 60:40 optical fiber coupler 3; the 60:40 optical fiber coupler 3 is connected with an erbium-doped optical fiber amplifier 6;

after passing through the first polarization controller 2, the laser output by the semiconductor laser 1 of the chaotic laser is divided into two paths by the optical fiber coupler 3 with the splitting ratio of 60:40, wherein 40% of ports are connected with the adjustable optical attenuator 4 and the optical fiber reflector 5 to form a feedback structure; the adjustable optical attenuator 4 and the first polarization controller 3 enable feedback light to return to the interior of the semiconductor laser 1 under appropriate intensity and polarization state to disturb the semiconductor laser, so that the semiconductor laser works in a chaotic oscillation state, and generated chaotic laser is output by a 60% port of the optical fiber coupler 3; the chaotic laser is amplified to a certain power by the erbium-doped fiber amplifier 6, then is input into the high nonlinear fiber 8 by the second polarization controller 7, and is subjected to photoelectric conversion by the high-speed photoelectric detector 9 to output a final result; because the original chaotic laser signal enters the high nonlinear optical fiber 8 after being amplified, the combination effect of nonlinear effect and dispersion occurs, the spectrum is obviously broadened, the spectrum bandwidth is enhanced, the final output presents the spectrum characteristic of millimeter wave noise, and the generation of millimeter wave noise is realized.

In the photo-generated millimeter wave noise generator, the chaotic laser realizes the generation of chaotic laser through optical feedback, and is the simplest structure for the generation of chaotic laser.

In the photo-generated millimeter wave noise generator, the erbium-doped fiber amplifier 6 is used for realizing amplification of original chaotic laser and power regulation of finally generated millimeter wave noise.

In the photo-generated millimeter wave noise generator, the nonlinear coefficient of the high nonlinear optical fiber 8 is more than 10W^-1km^-1After the chaotic laser passes through the high nonlinear optical fiber, nonlinear effect and dispersion effect occur, chaotic spectrum broadening is realized, the bandwidth of chaotic signals is enhanced, and finally millimeter wave noise with flat frequency spectrum is output.