CN111416577B - Millimeter wave noise signal generation device and method based on optical fiber nonlinear effect - Google Patents
Millimeter wave noise signal generation device and method based on optical fiber nonlinear effect Download PDFInfo
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- CN111416577B CN111416577B CN202010141864.0A CN202010141864A CN111416577B CN 111416577 B CN111416577 B CN 111416577B CN 202010141864 A CN202010141864 A CN 202010141864A CN 111416577 B CN111416577 B CN 111416577B
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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 a millimeter wave noise signal generating method based on an optical fiber nonlinear effect, wherein the device comprises the following components: the device 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, wherein 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 to 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 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 serves as the output end of the broadband photon millimeter wave noise signal generating device. The invention solves the problems of low noise signal power and low 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
Nonlinear effects refer to effects due to nonlinear polarization of a medium under strong light, and include optical harmonics, frequency multiplication, stimulated raman scattering, two-photon absorption, self-focusing, self-defocusing, and the like. The optical fiber is used as an excellent transmission medium, and 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), effects closely related to Kerr effects or refractive indexes (such as self-phase modulation SPM, cross-phase modulation XPM and four-wave mixing effect FWM) and the like.
Noise is an unavoidable source of interference in various fields of information space, whether device development or system construction, and noise generators are indispensable for better control of the effects of noise. Noise is currently produced 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 an important device for device parameter testing and system performance detection. The noise signal generator mainly aims at: introducing a random signal into the system to be tested to simulate noise in actual working conditions and measure the performance of the system; adding a known noise signal to compare with the noise in the system to determine the noise figure; the random signal is used instead of the sinusoidal or pulsed signal to test the dynamics of the system.
Millimeter wave noise refers to noise signals having wavelengths ranging from 10 millimeters to 1 millimeter, or frequencies ranging from 30 gigahertz to 300 gigahertz. 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 noise coefficients of high-frequency instruments and components, testing signal-to-noise ratio of a radar system, analyzing improved channels and error rates of a communication system, and the like.
The main problems with noise signal generators existing today are: the mode of generating noise by digital synthesis is mostly limited by the clock frequency of an electronic device, and the working frequency of a noise source generated by an electronic technology is low, the higher the output frequency is, the worse the flatness of the output noise power is, and the lower the super-noise ratio is. The noise signal generated based on the spontaneous radiation of the broadband light source has the problem of low power, and the noise signal generated by adopting the photon method at present has the defects of low output power, narrow bandwidth, difficulty in flexibly regulating and controlling the frequency and the 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, which are used for overcoming the defects that noise signal power generated based on spontaneous radiation of a broadband light source is too low and bandwidth of noise signals is smaller in the prior art.
The primary purpose of the invention is to solve the technical problems, and the technical scheme of the invention is as follows:
a millimeter wave noise signal generating device based on optical fiber nonlinear effect, comprising: the device 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, wherein 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 to 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 the first programmable optical filter and the 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 generating device.
In this scheme, chaotic signal generator includes: the distributed feedback semiconductor laser, the polarization controller, the optical attenuator, the first optical splitter and the feedback device are connected in the following manner:
the output end of the distributed feedback 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 amplifier and the single-mode fiber are connected in a specific way, wherein 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 fiber, and the other end of the single-mode 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 beat frequency device for forming the two-channel chaotic signal are arranged, wherein the broadband chaotic laser signals output by the chaotic spectrum stretcher are respectively output to the first programmable optical filter and the second programmable optical filter through the second optical splitter, the first programmable optical filter and the second programmable optical filter respectively conduct wavelength selection and spectral shaping on the chaotic signals of the channel where the first programmable optical filter and the second programmable optical filter are located, two paths of chaotic signals with different wave bands are selected, beat frequency is conducted through the optical coupler, spectrum-electric spectrum conversion is achieved on the signals after beat frequency through the photon mixer, and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
In this scheme, the center wavelength of first programmable optical filter is different with the second programmable optical filter, and the bandwidth can be independently adjusted.
The second aspect of the present invention provides a millimeter wave noise signal generating method based on an optical fiber nonlinear effect, the method is applied to the millimeter wave noise signal generating device based on the optical fiber nonlinear effect, and the method comprises:
the output signals of the chaotic signal generator are input to the chaotic spectrum stretcher, the chaotic spectrum stretcher outputs wideband chaotic laser signals to be respectively output to the first programmable optical filter and the second programmable optical filter through the second optical splitter, the first programmable optical filter and the second programmable optical filter respectively conduct wavelength selection and spectral shaping on the chaotic laser signals of the channel where the first programmable optical filter and the second programmable optical filter are located, two paths of chaotic signals with different wave bands are selected, beat frequency is conducted through the optical coupler, spectrum-electric spectrum conversion is achieved on the signals after beat frequency through the photon mixer, 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 uses the random chaotic laser in the 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 solves the problems of low noise signal power and low noise signal bandwidth generated by the noise generator based on the optical method in the prior art.
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Fig. 1 is a schematic diagram of a millimeter wave noise signal generating device based on the nonlinear effect of an optical fiber.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
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 described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Example 1
As shown in fig. 1, the invention discloses a millimeter wave noise signal generating device based on optical fiber nonlinear effect, which comprises: the 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 to 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 to 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 a broadband photon millimeter wave noise signal generating 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 feedback semiconductor laser 101 is connected to the input end of the polarization controller 102, the output end of the polarization controller 102 is connected to the input end of the optical attenuator 103, the output end of the optical attenuator 103 is connected to the input end of the first optical splitter 104, and the output ends of the first optical splitter 104 are respectively connected to the input ends of the feedback device 3 and the chaotic spectrum stretcher 2.
It should be noted that the external cavity feedback composed of the distributed feedback semiconductor laser 101 and the feedback device 3 is used to generate 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 optical fiber 202 are specifically connected in such a way that the output end of the 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 the second optical splitter 4.
After the chaotic laser signal is input to the chaotic spectrum stretcher 2, the chaotic laser signal is amplified by the optical amplifier 201, so that the power is increased to about several tens of mW. The chaotic laser signal enters a single mode fiber 202 of 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 the chaotic random signal with no time delay characteristic is displayed in the time domain.
In this scheme, 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 and the dual-channel chaotic signal beat frequency device are formed, wherein the broadband chaotic laser signal (i.e. the spectrally broadened 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 after being split by the second optical splitter 4, and the first programmable optical filter 5 filters the spectrum of the input broadband chaotic laser signal and flexibly selects the wavelength and the corresponding bandwidth of the broadened spectrum;
the second programmable optical filter 6 filters other parts of the broadened spectrum of the input broadband chaotic laser signal, flexibly selects filtering wavelengths and corresponding bandwidths, and selects two chaotic laser signals with different wavebands.
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 through the optical coupler 7, the beat frequency of the two paths of chaotic laser signals is realized, the signal conversion from spectrum to electric spectrum is carried out through the beat frequency of the two paths of different optical signals, and finally, the broadband millimeter wave noise signals with controllable frequency and bandwidth are output through the photon 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 bandwidths can be independently adjusted. The wavelength and chaotic laser signal bandwidth employed are related to the target millimeter wave noise signal generated. The wavelength interval of the two paths of broadband chaotic laser signals determines the frequency of the millimeter wave noise signals, and the spectral width of the two paths of broadband chaotic laser signals determines the frequency width of the generated millimeter wave noise signals.
The second aspect of the present invention provides a millimeter wave noise signal generating method based on an optical fiber nonlinear effect, the method is applied to the millimeter wave noise signal generating device based on the optical fiber nonlinear effect, and the method comprises: the output signal of the chaotic signal generator 1 is input to the chaotic spectrum stretcher 2, the chaotic spectrum stretcher 2 outputs a wideband chaotic laser signal to be 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 spectral shaping on the chaotic laser signal of the channel where the chaotic laser signal is located, two paths of chaotic signals with different wave bands are selected, beat frequency is performed through the optical coupler 7, the signals after beat frequency realize spectrum-electric spectrum conversion through the 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 uses the distributed feedback semiconductor laser as a laser source, combines feedback components, and adopts the optical feedback method to generate chaos to form the chaos semiconductor laser. The output chaotic laser signal passes through a single-mode fiber with self-phase modulation and group velocity dispersion, and utilizes the nonlinear effect of the single-mode fiber to output a noise signal with broader spectral linewidth, flatter noise spectrum and broader power spectrum. By regulating and controlling the wavelength of the two filters, not only can the frequency spectrum interval between the filters be flexibly modulated, but also the frequency point of millimeter wave noise can be regulated. The chaotic signals with different wavelengths are subjected to beat frequency through the photon mixer to generate broadband high-frequency millimeter wave noise signals, and the problems of low noise signal power and low noise signal bandwidth generated by the noise generator based on the optical method in the prior art are effectively solved.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (6)
1. A millimeter wave noise signal generating device based on optical fiber nonlinear effect, comprising: the 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 to 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 recorded 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 to 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 photon mixer (8) is used as a broadband photon output device for generating millimeter wave noise signals.
2. The millimeter wave noise signal generating device based on the nonlinear effect of the optical fiber according to claim 1, wherein the chaotic signal generator comprises: the distributed feedback semiconductor laser (101), a polarization controller (102), an optical attenuator (103), a first optical splitter (104) and a feedback device (3), wherein the specific connection relations are as follows:
the output end of the distributed feedback semiconductor laser (101) is connected to the input end of the polarization controller (102), the output end of the polarization controller (102) is connected to the input end of the optical attenuator (103), the output end of the optical attenuator (103) is connected to the input end of the first optical splitter (104), and the output ends of the first optical splitter (104) are respectively connected to the input ends of the feedback device (3) and the chaotic spectrum stretcher (2).
3. The millimeter wave noise signal generation device based on the optical fiber nonlinear effect according to claim 1, wherein the chaotic spectrum stretcher (2) comprises: the optical amplifier (201) and the single-mode fiber (202) are connected in a specific connection mode, wherein the output end of the 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 fiber (202), and the other end of the single-mode fiber (202) is connected to the input end of the second optical splitter (4).
4. The millimeter wave noise signal generating device based on the optical 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) and the dual-channel chaotic signal beat frequency device are formed, broadband chaotic laser signals output by the chaotic spectrum stretcher (2) are 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 conduct wavelength selection and spectral shaping on chaotic signals of channels where the chaotic signals are located, two paths of chaotic signals with different wave bands are selected, beat frequencies are conducted through the optical coupler (7), spectrum-electric spectrum conversion is achieved on the beaten signals through the photon mixer (8), and finally bandwidth and frequency band controllable millimeter wave electric noise is output.
5. The millimeter wave noise signal generating device based on the nonlinear effect of the optical fiber according to claim 1, wherein the center wavelength of the first programmable optical filter (5) is different from that of the second programmable optical filter, and the bandwidth can be independently adjusted.
6. A millimeter wave noise signal generation method based on an optical fiber nonlinear effect, the method being applied to the millimeter wave noise signal generation device based on an optical fiber nonlinear effect according to any one of claims 1 to 5, the method comprising:
the method comprises the steps that an output signal of a chaotic signal generator (1) is input to a chaotic spectrum stretcher (2), a chaotic laser signal of a broadband output of 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 conduct wavelength selection and spectrum shaping on the chaotic laser signal of a channel where the first programmable optical filter and the second programmable optical filter are located, two paths of chaotic signals of different wave bands are selected, beat frequency is conducted through an optical coupler (7), spectrum-electric spectrum conversion is achieved on the signals after beat frequency through a photon mixer (8), and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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