CN110808789B - Ultra-wideband high-frequency electromagnetic environment signal generation method based on optical heterodyne technology - Google Patents
Ultra-wideband high-frequency electromagnetic environment signal generation method based on optical heterodyne technology Download PDFInfo
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- CN110808789B CN110808789B CN201911100761.3A CN201911100761A CN110808789B CN 110808789 B CN110808789 B CN 110808789B CN 201911100761 A CN201911100761 A CN 201911100761A CN 110808789 B CN110808789 B CN 110808789B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/64—Heterodyne, i.e. coherent receivers where, after the opto-electronic conversion, an electrical signal at an intermediate frequency [IF] is obtained
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/676—Optical arrangements in the receiver for all-optical demodulation of the input optical signal
- H04B10/677—Optical arrangements in the receiver for all-optical demodulation of the input optical signal for differentially modulated signal, e.g. DPSK signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
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- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
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Abstract
The invention discloses an ultra-wideband high-frequency electromagnetic environment signal generation method based on an optical heterodyne technology, which is characterized in that the same light source is divided into two paths, one path of the light source utilizes an IQ modulator to modulate a baseband signal into an optical wave, the other path of the light source utilizes a carrier suppression mode of an intensity modulator to modulate a carrier frequency signal into the optical wave, a first-order upper sideband is filtered out through an optical filter, then the two paths of light are combined and sent to a photoelectric detector for beat frequency, a broadband radio frequency signal with stable frequency is generated, and the ultra-wideband high-frequency electromagnetic environment signal generation method can be used for the simulation of a complex electromagnetic environment. The method solves the problem of physical simulation of electromagnetic environment signals formed by multiple interference sources, and can be applied to simulation of complex electromagnetic environments.
Description
Technical Field
The invention belongs to the technical field of photon up-conversion, and particularly relates to an ultra-wideband high-frequency electromagnetic environment signal generation method based on an optical heterodyne technology.
Background
The electronic device is affected by a complex electromagnetic environment, and the working performance of the electronic device is reduced. In order to deeply research the effect of the electromagnetic environment, the physical simulation of the electromagnetic environment close to the reality is an important means. In a real environment, because of numerous radiation sources and complex patterns, the biggest difficulty in physical simulation of a complex electromagnetic environment is to simulate ultra-wideband electromagnetic environment signals. The ultra-wideband simulation is difficult to realize due to the limitation of the bandwidth of an electronic device, and the requirement on the electronic device is higher along with the increase of the frequency of an environmental signal to be simulated. Therefore, there is a need for a simple and efficient linear generation of ultra-wideband high frequency electromagnetic environment signals by optical methods. The optical heterodyne method has the highest bandwidth and frequency upper limit, and the signal-to-noise ratio is good, so that the method is a preferred scheme in the scene. The traditional optical heterodyne method utilizes two independent light sources to carry out beat frequency, has simple scheme and low requirement on device bandwidth, but has random phase noise between the two light sources, and is difficult to ensure the stability of frequency. Some auxiliary means are usually adopted to solve these problems, such as optical injection locking, optical phase-locked loop, optical injection phase-locked loop, etc. The light injection locking is realized by adding radio frequency drive to the master laser, the emergent light wave of the light injection locking comprises a plurality of symmetrical sidebands and then is injected into the two slave lasers with the frequencies respectively close to the +/-n-order sidebands, the frequency locking is realized, the phase noise brought by the method is low, and the locking bandwidth range is limited. The optical phase-locked loop method compares a signal obtained by the beat frequency of the light waves of the two lasers through the photoelectric detector with a reference signal, and feeds error information back to one of the lasers through a loop, and the lasers change the output according to the error information so as to complete frequency locking. The light injection phase-locked loop method combines the two methods, has a larger locking range and better phase noise suppression capability, but the system is too complex.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for generating an ultra-wideband high-frequency electromagnetic environment signal based on an optical heterodyne technology, solving the physical simulation problem of an electromagnetic environment signal consisting of a plurality of interference sources, and being applicable to simulation of a complex electromagnetic environment.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method comprises the following steps of firstly, dividing continuous light waves into at least two paths; step two, one path modulates the baseband signal to the light wave, and the other path modulates the carrier frequency signal to the light wave by utilizing the carrier suppression mode of the intensity modulator; combining the two paths of light and sending the light to a photoelectric detector for beat frequency; and step four, filtering out harmonic waves through a filter to finally obtain the radio frequency linear frequency modulation signal.
According to the technical scheme, the same frequency of the continuous light waves is fcIs generated.
According to the above technical solution, in the second step, one path modulates the baseband signal to the optical wave through the IQ modulator.
According to the above technical solution, in the second step, the other path passes through the MZM of the carrier suppression mode to set the frequency to f0Modulating the sine wave carrier frequency signal to light wave to obtain two first-order sidebands, and filtering out the first-order sidebands through an optical filter to obtain a carrier signal with the frequency fc+ f0Or fc-f0Light waves.
According to the above technical solution, in the second step, the baseband complex signal I, Q is modulated onto the optical wave in two ways by using the IQ modulator composed of two mach-zehnder modulators biased at the minimum transmission operating point and a 90 ° phase shifter.
The invention has the following beneficial effects: the problem of electromagnetic environment signal simulation formed by multiple interference sources is solved, and the method can be applied to simulation of various complex electromagnetic environments. The linear generation scheme provided by the invention is simple and efficient, supports ultra-large bandwidth and ultra-high frequency, is stable in frequency and has strong engineering practicability.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an ultra-wideband high frequency electromagnetic environment signal generation scheme in an embodiment of the invention;
FIG. 2 is a transmission curve of an MZM modulator in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an IQ modulator according to an embodiment of the present invention;
FIG. 4 is a laser output spectrum in an embodiment of the present invention;
FIG. 5 is a spectrum after IQ modulation in an embodiment of the present invention;
FIG. 6 is a spectrum after an optical filter in an embodiment of the present invention;
FIG. 7 is a spectrum before the photodetector in an embodiment of the present invention;
FIG. 8 is a frequency spectrum after electrical filtering in an embodiment of the present invention;
FIG. 9 is a double pulse waveform comparison of a comparison graph of time domain waveforms of RF chirp signals obtained by an optical method and an electrical domain up-conversion method in an embodiment of the present invention;
fig. 10 is a local amplification comparison of a comparison graph of time-domain waveforms of the rf chirp signals obtained by the optical method and the electrical domain up-conversion method in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiment of the invention, as shown in fig. 1, a schematic diagram of an overall generation scheme is shown. Firstly, a continuous light wave generated by a light source with the same frequency of 193.1THz and the power of 0dBm is divided into two paths, one path modulates a baseband linear frequency modulation signal with the bandwidth of 2GHz, the pulse width of 1 mus and the repetition period of 5 mus into the light wave through an IQ modulator, the other path modulates a 10GHz sine wave carrier frequency signal into the light wave through MZM in a carrier suppression mode to obtain two first-order sidebands, and filters out a first-order upper sideband through an optical filter to obtain the light wave with the frequency of 193.11 THz. And then the two paths of light are combined and sent to a photoelectric detector for beat frequency, harmonic waves are filtered by an electric filter, and finally a 10GHz radio frequency linear frequency modulation signal is obtained, so that the linear generation of the ultra-wideband electromagnetic environment signal is realized.
Fig. 2 shows a typical MZM transmission curve. A mach-zehnder modulator (MZM) is a commonly used optical modulator, and by adjusting a dc bias voltage, an operating state of the modulator can be changed, thereby obtaining different output signals.
The expressions of the light wave signal output by the light source and the radio frequency driving signal are as follows:
ECW(t)＝E0exp(j2πfct) (1)
ERF(t)＝sin(2πfst) (2)
wherein E0Is the amplitude of the light wave, fcIs the frequency of light wave, fsIs the frequency of the radio frequency signal. Adjusting the direct current bias voltage to enable the MZM to be at the minimum transmission operating point, and then outputting signals of the MZM are as follows:
wherein, JnBeing a Bessel function of the first kind of order n, k ═ π VDC/Vπ，VDCAnd VπRespectively, a direct current bias voltage and a half-wave voltage of the MZM. It can be seen that when the MZM is at the minimum transmission operating point, only odd order sidebands are generated and even order sidebands are suppressed. Frequency spacing between adjacent sidebands of 2fsAnd as the sideband order increases, the sideband power decreases, the higher order sidebands can be ignored in the small signal case, and only the two first order sidebands are considered, i.e., the carrier suppressed (OCS) mode.
Fig. 3 shows a schematic diagram of an IQ modulator comprising two MZMs both biased at the lowest point of the power transfer function and a 90 ° phase shifter. The two paths of information of the baseband chirp signal I, Q can be modulated to light waves via an IQ modulator.
Fig. 4-8 show spectra/spectra for various points in the scheme.
Fig. 9 and fig. 10 are graphs showing time domain waveforms of radio frequency linear frequency modulation signals obtained by the transmission method and the electric domain up-conversion method, wherein gray represents a signal obtained by the scheme, black represents a signal obtained by the electric domain up-conversion method, and the similarity between the two waveforms shows that the scheme can linearly up-convert an ultra-wideband baseband signal to a radio frequency.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (1)
1. A method for generating an ultra-wideband high-frequency electromagnetic environment signal based on an optical heterodyne technology is characterized by comprising the following steps of dividing continuous light waves into at least two paths; step two, one path modulates the baseband signal to the light wave, and the other path modulates the carrier frequency signal to the light wave by utilizing the carrier suppression mode of the intensity modulator; in the second step, the other path passes through the MZM of the carrier suppression mode to convert the frequencyIs f0Modulating the carrier frequency signal to light wave to obtain two first-order sidebands, and filtering out the first-order sidebands by an optical filter to obtain a carrier frequency fc+ f0Or fc- f0A light wave; one path modulates a baseband signal to an optical wave through an IQ modulator, and modulates two paths of baseband complex signals I, Q to the optical wave through an IQ modulator consisting of two Mach-Zehnder modulators biased at the minimum transmission working point and a 90-degree phase shifter; combining the two paths of light and sending the light to a photoelectric detector for beat frequency; filtering out harmonic waves through a filter to finally obtain a radio frequency linear frequency modulation signal; continuous light wave with frequency fcIs generated by the light source of (1).
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| CN103326789A (en) * | 2013-05-03 | 2013-09-25 | 华中科技大学 | System and method for frequency tunable microwave phase shifting |
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| US8358933B2 (en) * | 2009-09-18 | 2013-01-22 | Nec Laboratories America, Inc. | Optical signal sideband millimeter-wave signal generation for super-broadband optical wireless network |
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