CN111416577A - Millimeter wave noise signal generating device and method based on optical fiber nonlinear effect - Google Patents
Millimeter wave noise signal generating device and method based on optical fiber nonlinear effect Download PDFInfo
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- CN111416577A CN111416577A CN202010141864.0A CN202010141864A CN111416577A CN 111416577 A CN111416577 A CN 111416577A CN 202010141864 A CN202010141864 A CN 202010141864A CN 111416577 A CN111416577 A CN 111416577A
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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
The invention discloses a millimeter wave noise signal generating device and method based on optical fiber nonlinear effect, wherein the device comprises: the output ends of the first programmable optical filter and the second programmable optical filter are connected to the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the photonic mixer, and the output end of the photonic mixer is used as the output end of the broadband photonic millimeter wave noise signal generating device. The invention overcomes the problems of low noise signal power and small noise signal bandwidth generated based on an optical method.
Description
Technical Field
The invention relates to the technical field of optical fiber noise signals, in particular to a millimeter wave noise signal generating device and method based on an optical fiber nonlinear effect.
Background
The nonlinear effect refers to an effect generated by nonlinear polarization of a medium under the action of strong light, and comprises optical harmonic, frequency doubling, stimulated Raman scattering, two-photon absorption, self-focusing, self-defocusing and the like. The optical fiber as an excellent transmission medium can generate various complex nonlinear effects under the action of high-power optical signals, including scattering effects (stimulated Brillouin scattering SBS, stimulated Raman scattering SRS and the like), Kerr effect or refractive index closely related effects (such as self-phase modulation SPM, cross-phase modulation XPM, four-wave mixing effect FWM) and the like.
Noise is an inevitable interference source, exists in various fields of information space, and a noise generator is indispensable for better controlling the influence of noise regardless of device development or system construction. Noise is currently generated mainly by two approaches, digital synthesis and physical noise source amplification.
The noise signal generator is a special device capable of generating noise in a specific frequency band, and is important equipment for testing device parameters and detecting system performance. The main purposes of the noise signal generator are as follows: introducing a random signal into the system to be tested to simulate the noise in the actual working condition to determine the performance of the system; applying a known noise signal to compare with the system internal noise to determine a noise figure; a random signal is used instead of a sinusoidal or pulsed signal to test the dynamic characteristics of the system.
Millimeter wave noise refers to noise signals having a wavelength ranging from 10 millimeters to 1 millimeter, or a frequency ranging from 30 gigahertz to 300 gigahertz. The method has good noise and gain characteristics in the millimeter wave frequency band. In practical application, the millimeter wave noise signal can be used for measuring the noise coefficient of a high-frequency instrument and a high-frequency component, testing the signal-to-noise ratio of a radar system, analyzing an improved channel and the error rate of a communication system and the like.
The main problems with the noise signal generators present today are: the way of generating noise by digital synthesis is mostly limited by the clock frequency of electronic devices, and the working frequency of a noise source generated by electronic technology is low, the higher the output frequency is, the worse the flatness of the output noise power is, and the lower the excess noise ratio is. The problem that the power of a noise signal generated based on spontaneous radiation of a broadband light source is too low exists, and the noise signal generated by adopting a photon method at present has the defects of small output power, narrow bandwidth, difficulty in flexibly regulating and controlling the frequency and bandwidth of the noise signal and the like. Aiming at the problems, the invention provides a method and a device for generating a millimeter wave noise signal with controllable frequency and adjustable bandwidth based on the nonlinear effect of a chaotic signal.
Disclosure of Invention
The invention provides a millimeter wave noise signal generating device and method based on an optical fiber nonlinear effect, aiming at overcoming the defects that the power of a noise signal generated based on spontaneous radiation of a broadband light source is too low and the bandwidth of the noise signal is small in the prior art.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
a millimeter wave noise signal generating device based on fiber nonlinear effect comprises: a chaotic signal generator, a chaotic spectrum stretcher, a second optical splitter, a first programmable optical filter, a second programmable optical filter, an optical coupler and a photon mixer, the output end of the chaotic signal generator is connected with the input end of the chaotic spectrum stretcher, the output end of the chaotic spectrum stretcher is connected with the input end of the second optical splitter, the second optical splitter is provided with two output ends, each output end is connected with the programmable optical filter, the programmable optical filters are respectively marked as a first programmable optical filter and a second programmable optical filter, the output ends of the first programmable optical filter and the second programmable optical filter are connected to the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the photon mixer, and the output end of the photon mixer is used as the output end of the broadband photon millimeter wave noise signal generation device.
In this scheme, the chaotic signal generator includes: the distributed feedback semiconductor laser, the polarization controller, the optical attenuator, the first optical splitter and the feedback device have the following specific connection relations:
the output end of the distributed semiconductor laser is connected to the input end of the polarization controller, the output end of the polarization controller is connected to the input end of the optical attenuator, the output end of the optical attenuator is connected to the input end of the first optical splitter, and the output end of the first optical splitter is respectively connected to the input ends of the feedback device and the chaotic spectrum stretcher.
In this scheme, the chaotic spectrum stretcher includes: the optical fiber amplifier and the single-mode optical fiber are connected in a specific connection relationship that the output end of the chaotic signal generator is connected to the input end of the optical amplifier, the output end of the optical amplifier is connected to one end of the single-mode optical fiber, and the other end of the single-mode optical fiber is connected to the input end of the second optical splitter.
In the scheme, the second optical splitter, the first programmable optical filter, the second programmable optical filter, the optical coupler, the photon mixer and the dual-channel chaotic signal beat frequency device are formed, wherein a broadband chaotic laser signal output by the chaotic spectrum stretcher is output to the first programmable optical filter and the second programmable optical filter through the second optical splitter respectively, the first programmable optical filter and the second programmable optical filter perform wavelength selection and spectrum shaping on the chaotic signal of a channel where the chaotic signal is located respectively, two paths of chaotic signals with different wave bands are selected, beat frequency is performed through the optical coupler, spectrum-electric spectrum conversion is achieved through the photon mixer on the signal after beat frequency, and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
In the scheme, the center wavelengths of the first programmable optical filter and the second programmable optical filter are different, and the bandwidth can be independently adjusted.
The second aspect of the present invention provides a millimeter wave noise signal generating method based on the fiber nonlinear effect, where the method is applied to the millimeter wave noise signal generating device based on the fiber nonlinear effect, and the method includes:
the output signal of the chaotic signal generator is input to the chaotic spectrum stretcher, the chaotic laser signal of the chaotic spectrum stretcher output broadband is respectively output to a first programmable optical filter and a second programmable optical filter through a second optical splitter, the first programmable optical filter and the second programmable optical filter respectively carry out wavelength selection and spectrum shaping on the chaotic laser signal of a channel where the chaotic laser signal is located, two chaotic signals of different wave bands are selected, beat frequency is carried out through an optical coupler, spectrum-electric spectrum conversion is realized through a photon frequency mixer after the beat frequency is carried out on the signal, and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention takes the chaotic laser with random time domain as a signal source, utilizes the nonlinear effect in the optical fiber to generate the high-frequency broadband photon millimeter wave noise signal with variable frequency and adjustable bandwidth, and effectively overcomes the problems of low noise signal power and small noise signal bandwidth generated by the noise generator based on the optical method in the prior art.
Drawings
Fig. 1 is a schematic diagram of a millimeter wave noise signal generating device based on the fiber nonlinear effect according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, the present invention discloses a millimeter wave noise signal generating device based on fiber nonlinear effect, the device includes: the chaotic signal generating device comprises a chaotic signal generator 1, a chaotic spectrum stretcher 2, a second optical splitter 4, a first programmable optical filter 5, a second programmable optical filter 6, an optical coupler 7 and a photon mixer 8, wherein the output end of the chaotic signal generator 1 is connected with the input end of the chaotic spectrum stretcher 2, the output end of the chaotic spectrum stretcher 2 is connected with the input end of the second optical splitter 4, the second optical splitter 4 is provided with two output ends, each output end is connected with the programmable optical filter, the programmable optical filters are respectively marked as the first programmable optical filter 5 and the second programmable optical filter 6, the output ends of the first programmable optical filter 5 and the second programmable optical filter 6 are connected with the input end of the optical coupler 7, and the output end of the optical coupler 7 is connected with the input end of the photon mixer 8, the output end of the photonic mixer 8 is used as the output end of the broadband photonic millimeter wave noise signal generation device.
More specifically, the chaotic signal generator 1 includes: the distributed feedback semiconductor laser 101, the polarization controller 102, the optical attenuator 103, the first optical splitter 104 and the feedback device 3 have the following specific connection relations:
the output end of the distributed semiconductor laser 101 is connected to the input end of a polarization controller 102, the output end of the polarization controller 102 is connected to the input end of an optical attenuator 103, the output end of the optical attenuator 103 is connected to the input end of a first optical splitter 104, and the output end of the first optical splitter 104 is connected to the input ends of a feedback device 3 and a chaotic spectrum stretcher 2 respectively.
It should be noted that the external cavity feedback composed of the distributed semiconductor laser 101 and the feedback device 3 is used for generating the chaotic laser signal. The chaotic laser signal is input into the chaotic spectrum stretcher 2.
In this embodiment, the chaotic spectrum stretcher 2 includes: the optical amplifier 201 and the single mode fiber 202 are connected in a specific relationship that an output end of the chaotic signal generator 1 is connected to an input end of the optical amplifier 201, an output end of the optical amplifier 201 is connected to one end of the single mode fiber 202, and the other end of the single mode fiber 202 is connected to an input end of the second optical splitter 4.
It should be noted that, after the chaotic laser signal is input into the chaotic spectrum stretcher 2, the chaotic laser signal is amplified by the optical amplifier 201, and the power is raised to about several tens mW. The chaotic laser signal enters a single-mode fiber 202 of several tens of kilometers for transmission. By adjusting the optical power of the input chaotic laser signal, the chaotic laser signal undergoes the combined action of group velocity dispersion and self-phase modulation fiber nonlinear effect in the single-mode fiber 202, so that the spectrum of the input chaotic laser signal is greatly expanded in the frequency domain and is represented as a chaotic random signal without time delay characteristics in the time domain.
In the scheme, the second optical splitter 4, the first programmable optical filter 5, the second programmable optical filter 6, the optical coupler 7 and the photon mixer 8 form a dual-channel chaotic signal beat frequency device, wherein a broadband chaotic laser signal (i.e., a spectrally broadened chaotic laser signal) output by the chaotic spectrum stretcher 2 is split by the second optical splitter 4 and is output to the first programmable optical filter 5 and the second programmable optical filter 6 respectively, the first programmable optical filter 5 filters the spectrum of the input broadband chaotic laser signal, and the broadened wavelength and the corresponding bandwidth are flexibly selected;
the second programmable optical filter 6 filters other parts of the broadened spectrum of the input broadband chaotic laser signal, flexibly selects the filtering wavelength and the corresponding bandwidth, and selects two paths of chaotic laser signals with different wave bands.
After the spectrum regulation of the first programmable optical filter 5 and the second programmable optical filter 6, two paths of broadband chaotic laser signals with different wavelengths are combined by the optical coupler 7 to realize the beat frequency of two beams of chaotic laser signals, the signal conversion from the spectrum to the electric spectrum is carried out by the beat frequency of two paths of different optical signals, and finally, broadband millimeter wave noise signals with controllable frequency and bandwidth are output by the photonic mixer 8.
It should be noted that the center wavelengths of the first programmable optical filter 5 and the second programmable optical filter 6 are different, and the bandwidths can be adjusted independently. The wavelength and the bandwidth of the chaotic laser signal are related to the generated target millimeter wave noise signal. The wavelength interval of the two broadband chaotic laser signals determines the frequency of the millimeter wave noise signal, and the spectral width of the two broadband chaotic laser signals determines the bandwidth of the generated millimeter wave noise signal.
The second aspect of the present invention provides a millimeter wave noise signal generating method based on the fiber nonlinear effect, where the method is applied to the millimeter wave noise signal generating device based on the fiber nonlinear effect, and the method includes: the output signal of the chaotic signal generator 1 is input to the chaotic spectrum stretcher 2, the chaotic laser signal of the wide band output by the chaotic spectrum stretcher 2 is output to a first programmable optical filter 5 and a second programmable optical filter 6 through a second optical splitter 4 respectively, the first programmable optical filter 5 and the second programmable optical filter 6 perform wavelength selection and spectrum shaping on the chaotic laser signal of a channel where the chaotic laser signal is located respectively, two chaotic signals of different wave bands are selected, beat frequency is performed through an optical coupler 7, the spectrum-electric spectrum conversion of the beat frequency signal is realized through a photon mixer 8, and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
Compared with the noise generator based on the optical method in the prior art, the invention utilizes the distributed feedback semiconductor laser as a laser source, combines feedback components and adopts the optical feedback method to generate chaos to form the chaotic semiconductor laser. The output chaotic laser signal passes through a single-mode fiber with self-phase modulation and group velocity dispersion, and a noise signal with widened spectral line width, flatter noise spectrum and widened power spectrum is output by utilizing the nonlinear effect of the single-mode fiber. By regulating and controlling the wavelengths of the two filters, the frequency points of millimeter wave noise can be adjusted by flexibly modulating the spectrum interval between the filters. The chaotic signals with different wavelengths are subjected to beat frequency through the photonic mixer to generate broadband high-frequency millimeter wave noise signals, and the problems of low noise signal power and small noise signal bandwidth generated by the noise generator based on an optical method in the prior art are effectively solved.
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 generating device based on fiber nonlinear effect is characterized by comprising: the chaotic signal generating device comprises a chaotic signal generator (1), a chaotic spectrum stretcher (2), a second optical splitter (4), a first programmable optical filter (5), a second programmable optical filter (6), an optical coupler (7) and a photon mixer (8), wherein the output end of the chaotic signal generator (1) is connected with the input end of the chaotic spectrum stretcher (2), the output end of the chaotic spectrum stretcher (2) is connected with the input end of the second optical splitter (4), the second optical splitter (4) is provided with two output ends, each output end is connected with the programmable optical filter, the programmable optical filters are respectively marked as a first programmable optical filter (5) and a second programmable optical filter (6), the output ends of the first programmable optical filter (5) and the second programmable optical filter (6) are connected with the input end of the optical coupler (7), the output end of the optical coupler (7) is connected with the input end of the photon mixer (8), and the output end of the photon mixer (8) is used as the output end of the broadband photon millimeter wave noise signal generation device.
2. The apparatus of claim 1, wherein the chaotic signal generator comprises: distributed feedback semiconductor laser (101), polarization controller (102), optical attenuator (103), first beam splitter (104) and feedback device (3), the specific relation of connection is:
the output end of the distributed semiconductor laser (101) is connected to the input end of a polarization controller (102), the output end of the polarization controller (102) is connected to the input end of an optical attenuator (103), the output end of the optical attenuator (103) is connected to the input end of a first optical splitter (104), and the output end of the first optical splitter (104) is respectively connected to the input ends of a feedback device (3) and a chaotic spectrum stretcher (2).
3. The millimeter wave noise signal generating device based on the nonlinear effect of the optical fiber as claimed in claim 1, wherein the chaotic spectrum stretcher (2) comprises: the optical fiber amplifier comprises an optical fiber amplifier (201) and a single-mode optical fiber (202), wherein the specific connection relationship is that the output end of a chaotic signal generator (1) is connected to the input end of the optical amplifier (201), the output end of the optical amplifier (201) is connected to one end of the single-mode optical fiber (202), and the other end of the single-mode optical fiber (202) is connected to the input end of a second optical splitter (4).
4. The millimeter wave noise signal generating device based on the fiber nonlinear effect according to claim 1, wherein the second optical splitter (4), the first programmable optical filter (5), the second programmable optical filter (6), the optical coupler (7), the photon mixer (8) form a dual-channel chaotic signal beat frequency device, wherein the wide-band chaotic laser signal output by the chaotic spectrum stretcher (2) is respectively output to the first programmable optical filter (5) and the second programmable optical filter (6) through the second optical splitter (4), the first programmable optical filter (5) and the second programmable optical filter (6) respectively perform wavelength selection and spectrum shaping on the chaotic signal of the channel where the chaotic signal is located, select chaotic signals of different bands, perform beat frequency through the optical coupler (7), and the spectrum-electric spectrum conversion of the beated signal is realized through the photon mixer (8), and finally outputting millimeter wave electric noise with controllable bandwidth and frequency band.
5. The millimeter wave noise signal generating device based on the fiber nonlinear effect as claimed in claim 1, wherein the first programmable optical filter (5) and the second programmable optical filter have different center wavelengths, and the bandwidths can be adjusted independently.
6. A millimeter wave noise signal generation method based on fiber nonlinear effect, the method being applied to the millimeter wave noise signal generation device based on fiber nonlinear effect as claimed in any one of claims 1 to 5, the method comprising:
the chaotic signal generator is characterized in that an output signal of a chaotic signal generator (1) is input into a chaotic spectrum stretcher (2), the chaotic laser signal of a broadband output by the chaotic spectrum stretcher (2) is respectively output to a first programmable optical filter (5) and a second programmable optical filter (6) through a second optical splitter (4), the first programmable optical filter (5) and the second programmable optical filter (6) respectively perform wavelength selection and spectrum shaping on the chaotic laser signal of a channel where the chaotic laser signal is located, two paths of chaotic signals of different wave bands are selected, beat frequency is performed through an optical coupler (7), the signal after beat frequency realizes spectrum-electric spectrum conversion through a photon frequency mixer (8), and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
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| CN112436806A (en) * | 2020-10-10 | 2021-03-02 | 广东工业大学 | Millimeter wave noise signal generating device and generating method |
Citations (3)
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| EP1378789A2 (en) * | 2002-07-05 | 2004-01-07 | Fujitsu Limited | Method and device for generating a spectrally broadened optical signal |
| CN110850129A (en) * | 2019-10-18 | 2020-02-28 | 广东工业大学 | Broadband-controllable photon millimeter wave noise signal generator and signal generating method thereof |
| CN110850130A (en) * | 2019-10-18 | 2020-02-28 | 广东工业大学 | Broadband noise signal generator and signal generating method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1378789A2 (en) * | 2002-07-05 | 2004-01-07 | Fujitsu Limited | Method and device for generating a spectrally broadened optical signal |
| CN110850129A (en) * | 2019-10-18 | 2020-02-28 | 广东工业大学 | Broadband-controllable photon millimeter wave noise signal generator and signal generating method thereof |
| CN110850130A (en) * | 2019-10-18 | 2020-02-28 | 广东工业大学 | Broadband noise signal generator and signal generating method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436806A (en) * | 2020-10-10 | 2021-03-02 | 广东工业大学 | Millimeter wave noise signal generating device and generating method |
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