CN112532312A - Ultra-wideband electromagnetic environment signal generation device and method based on parallel optical IQ modulator - Google Patents
Ultra-wideband electromagnetic environment signal generation device and method based on parallel optical IQ modulator Download PDFInfo
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
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Abstract
The invention discloses an ultra-wideband electromagnetic environment signal generating device and method based on a parallel optical IQ modulator, wherein the device comprises: a signal source for generating a baseband signal and a frequency source signal; a laser for generating a continuous optical carrier; the first optical coupler is used for dividing the continuous light wave signal generated by the laser light source into two paths; the phase shifter is used for performing 90-degree phase shifting on the frequency source signal; a parallel IQ modulator comprising an IQ modulator add path and an IQ modulator drop path; the second optical coupler is used for combining the upper-path signal light wave and the lower-path beat frequency light wave; the photoelectric balance detector is used for carrying out beat frequency on the upper path signal light wave and the lower path beat frequency light wave to generate a radio frequency linear frequency modulation signal with the carrier frequency fs and the bandwidth B; an electrical filter for filtering harmonics of the radio frequency signal. The invention supports the generation of ultra-large bandwidth and ultra-high frequency electromagnetic environment signals and solves the bottleneck problem of ultra-wide band electromagnetic environment signal simulation.
Description
Technical Field
The invention relates to a microwave photonics technology, in particular to an ultra-wideband electromagnetic environment signal generation device and method based on a parallel optical IQ modulator.
Background
The physical simulation is close to a real electromagnetic environment, and the development of electromagnetic environment effect tests and experiments of electronic equipment is a key means for improving the electromagnetic environment adaptability of the electronic equipment. Due to the fact that radiation sources are numerous, patterns are complex, sideband broadening caused by channel nonlinearity of the radiation sources is serious, and the like, a wide frequency band is usually covered by a complex electromagnetic environment, and higher requirements are put forward for the bandwidth of a physical simulation system. As the frequency of the desired analog ambient signal increases, the demands on the electronics are higher. The microwave photonics technology fully utilizes the advantages of electronic devices and optical devices, can realize generation of ultra-wideband electromagnetic signals at low cost, and has great development potential.
The traditional optical heterodyne method utilizes two independent light sources to carry out beat frequency, can convert a baseband electromagnetic environment signal to a radio frequency, has a simple scheme and low requirements on device bandwidth, but has random phase noise between the two light sources, and is difficult to ensure the stability of the 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 signals obtained after the optical waves of the two lasers are subjected to beat frequency through the photoelectric detector with reference signals, error information is fed back to one of the lasers through a loop, the output of the lasers is changed according to the error information, and therefore frequency locking is completed. 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 technical problem to be solved by the present invention is to provide an apparatus and a method for generating an ultra-wideband electromagnetic environment signal based on a parallel optical IQ modulator, aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: an ultra-wideband electromagnetic environment signal generation device based on a parallel optical IQ modulator, comprising:
a signal source for generating a baseband signal and a frequency source signal; the bandwidth of the baseband signal is B, and the frequency of the frequency source signal is fs;
a laser for generating a continuous optical carrier;
the first optical coupler is used for dividing continuous optical carrier signals generated by the laser light source into two paths;
the phase shifter is used for performing 90-degree phase shifting on the frequency source signal;
the parallel IQ modulator comprises an upper path IQ modulator and a lower path IQ modulator, the upper path IQ modulator is driven by a broadband baseband signal to modulate the broadband baseband signal onto an upper path optical carrier, two paths of frequency source signals with frequency fs with a phase difference of 90 degrees drive the lower path IQ modulator to realize single-sideband modulation on the lower path optical carrier;
the second optical coupler is used for combining the upper path signal light and the lower path beat frequency light;
the photoelectric balance detector is used for carrying out beat frequency on the upper path signal light wave and the lower path beat frequency light wave to generate a radio frequency signal with the frequency fs and the bandwidth B;
and the electric filter is used for filtering the harmonic waves of the generated radio frequency signal.
In the invention, the output end of a laser is connected with the optical input end of an optical coupler by an optical fiber, and the output end of a radio frequency signal source is connected with the electrical input end of a phase shifter by a cable; the output end of the optical coupler is connected with the optical input end of the IQ modulator by an optical fiber; the output end of the baseband signal is respectively connected with the electrical input ends of an I circuit and a Q circuit in the IQ modulator by cables; the output end of the frequency source signal is connected with the input end of the I circuit in the IQ modulator through a cable, and the output end of the phase shifter is connected with the input end of the Q circuit in the IQ modulator through a cable; the output end of the IQ modulator is connected with the input end of the optical coupler by an optical cable; the output end of the optical coupler is connected with the input end of the photoelectric detector by an optical cable.
According to the above device, we also provide an ultra-wideband electromagnetic environment signal generation method based on a parallel optical IQ modulator, comprising the following steps:
1) dividing continuous light waves generated by a laser light source into two paths through an optical coupler;
2) based on an IQ modulator, modulating two paths of baseband complex signals I, Q onto an optical wave through one path of continuous optical wave to obtain an upper path of signal optical wave; the bandwidth of the baseband complex signal is B, the pulse width is tr, and the repetition period is PRI;
3) the other path of light wave output by the optical coupler is dropped by the parallel IQ modulator, and two paths of frequency source signals with 90-degree phase difference are used for driving the two paths of the optical IQ modulator I, Q, so that optical single-sideband modulation is realized, and a dropped beat frequency light wave is obtained; the frequency source signal frequency is fs;
4) after the upper path signal light wave in the step 2) and the lower path beat frequency light wave obtained in the step 3) pass through an optical coupler, the signal light wave and the beat frequency light wave are used for beating at a photoelectric balance detector to generate a radio frequency signal with the frequency of the frequency difference between the two light waves;
5) filtering the radio frequency signal of the step 4) by an electric filter to remove harmonic waves, and finally obtaining a radio frequency linear frequency modulation signal with the carrier frequency fs and the bandwidth B.
According to the scheme, the baseband signal modulation mode is Linear Frequency Modulation (LFM).
The invention has the following beneficial effects: the invention discloses an ultra-wideband electromagnetic environment signal generation device and method based on a parallel optical IQ modulator, solves the bottleneck problem of ultra-wideband electromagnetic environment signal simulation, and can be applied to simulation of various complex electromagnetic environments. The scheme of the invention is simple and efficient, supports the generation of ultra-large bandwidth and ultra-high frequency electromagnetic environment signals, has stable frequency and stronger engineering practicability.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an ultra wide band electromagnetic environment signal generation method of an embodiment of the present invention;
FIG. 3 is a graph of various point spectra/electrical spectra for an embodiment of the present invention;
fig. 4 is a comparison graph of an ultra wide band electromagnetic environment signal time domain waveform of an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following 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.
An ultra-wideband electromagnetic environment signal generation device based on a parallel optical IQ modulator, comprising:
a signal source for generating a baseband signal and a frequency source signal; the bandwidth of the baseband signal is B, and the frequency of the frequency source signal is fs;
a laser for generating a continuous light wave;
the first optical coupler is used for dividing the continuous light wave signal generated by the laser light source into two paths;
the phase shifter is used for performing 90-degree phase shifting on the frequency source signal;
the parallel IQ modulator comprises an IQ modulator upper path and an IQ modulator lower path, a broadband baseband signal drives the IQ modulator upper path to modulate the broadband baseband signal onto an upper path optical carrier, two paths of frequency source signals with frequency fs with 90-degree phase difference drive the IQ modulator lower path to realize single-sideband modulation on the lower path optical carrier;
the second optical coupler is used for combining the upper path signal light and the lower path beat frequency light;
the photoelectric balance detector is used for carrying out beat frequency on the upper path signal light and the lower path beat frequency light to generate a radio frequency linear frequency modulation signal with the carrier frequency fs and the bandwidth B;
and the electric filter is used for filtering harmonic waves for the generated radio frequency linear frequency modulation signal.
In the invention, the output end of a laser is connected with the optical input end of an optical coupler by an optical fiber, and the output end of a radio frequency signal source is connected with the electrical input end of a phase shifter by a cable; the output end of the optical coupler is connected with the optical input end of the IQ modulator by an optical fiber; the output end of the baseband signal is respectively connected with the electrical input ends of an I circuit and a Q circuit in the IQ modulator by cables; the output end of the frequency source signal is connected with the input end of the I circuit in the IQ modulator through a cable, and the output end of the phase shifter is connected with the input end of the Q circuit in the IQ modulator through a cable; the output end of the IQ modulator is connected with the input end of the optical coupler by an optical cable; the output end of the optical coupler is connected with the input end of the photoelectric detector by an optical cable.
As shown in fig. 1 and fig. 2, an ultra-wideband electromagnetic environment signal generating method based on a parallel optical IQ modulator includes the following steps:
firstly, dividing continuous light waves generated by a laser light source into two paths through a coupler;
one path modulates a broadband baseband signal to a carrier wave through an upper path of a parallel IQ modulator, wherein the modulation mode of the baseband signal is set to be a Linear Frequency Modulation (LFM) signal, the bandwidth is B, the pulse width is tr, and the repetition period is PRI.
And the other path of light wave output by the optical coupler is dropped by the parallel IQ modulator, and a frequency source signal with the frequency fs drives the IQ modulator dropped after passing through the 90-degree phase shifter, so that single-sideband modulation is realized.
The upper path signal light and the lower path beat frequency light pass through the optical coupler and then are balanced by the photoelectric detector, harmonic waves are filtered by the electric filter, and finally radio frequency linear frequency modulation signals with carrier frequency fs and bandwidth B are obtained, so that ultra-wideband electromagnetic environment signals are linearly generated, and the output spectra and electric spectrum diagrams of all photoelectric devices are shown in figure 2.
Fig. 3(a) - (e) show the spectrum/electric spectrum of the output of each device according to the method of the present application. Wherein, FIG. 3(a) is a light source output spectrum; FIG. 3(b) is the post-add IQ modulator spectrum; FIG. 3(c) is the spectrum after the down IQ modulator; FIG. 3(d) is a balanced photodetector front spectrum; fig. 3(e) is the electrical filtered spectrum.
The invention provides an ultra-wideband electromagnetic environment signal generation method based on a parallel optical IQ modulator, which adopts a parallel optical IQ modulator structure to perform electro-optical modulation on two paths of homologous optical signals, wherein one path modulates an ultra-wideband electromagnetic environment baseband signal onto an optical carrier, the other path realizes optical single-sideband modulation based on the optical IQ modulator, and then the two paths of optical are combined and subjected to beat frequency on a photoelectric detector to generate a wideband radio frequency signal with stable frequency, so that the generation of the ultra-wideband electromagnetic environment signal is realized.
Fig. 4 is a comparison graph of time-domain waveforms of the rf chirp signals obtained by the method proposed by this patent and the method of frequency up-conversion in the electrical domain, in which for comparison, the amplitudes of the signals generated by the two methods are set to be different, wherein the larger amplitude represents the signal obtained by the method proposed by this patent, and the smaller amplitude represents the signal obtained by frequency up-conversion in the electrical domain. The two waveforms are very close to each other as can be seen from the multi-pulse waveform and the intra-pulse amplified waveform diagram, which shows that the method provided by the patent can fully utilize the ultra-wideband characteristic of the photoelectric device, and can up-convert the ultra-wideband baseband signal to the radio frequency without distortion to generate the ultra-wideband electromagnetic environment signal, thereby reducing the requirement on the bandwidth of the electronic device.
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 (3)
1. An ultra-wideband electromagnetic environment signal generating device based on a parallel optical IQ modulator, comprising:
a signal source for generating a baseband signal and a frequency source signal; the bandwidth of the baseband signal is B, and the frequency of the frequency source signal is fs;
a laser for generating a continuous optical carrier;
the first optical coupler is used for dividing continuous optical carrier signals generated by the laser light source into two paths;
the phase shifter is used for performing 90-degree phase shifting on the frequency source signal;
the parallel IQ modulator comprises an upper path IQ modulator and a lower path IQ modulator, the upper path IQ modulator is driven by the broadband baseband signal to modulate the broadband baseband signal onto an upper path optical carrier, two paths of frequency source signals with frequency fs with 90-degree phase difference drive the lower path IQ modulator, and single-sideband modulation is realized on the lower path optical carrier.
The second optical coupler is used for combining the upper path signal light and the lower path beat frequency light;
the photoelectric balance detector is used for carrying out beat frequency on the upper path signal light and the lower path beat frequency light to generate a radio frequency signal with the frequency fs and the bandwidth B;
and the electric filter is used for filtering harmonic waves of the radio frequency signals.
2. An ultra-wideband electromagnetic environment signal generation method based on a parallel optical IQ modulator is characterized by comprising the following steps:
1) dividing continuous optical carriers generated by a laser light source into two paths through an optical coupler;
2) based on an IQ modulator, modulating two paths of baseband complex signals I, Q onto an optical wave through one path of continuous optical wave to obtain an upper path of signal light; the bandwidth of the baseband complex signal is B, the pulse width is tr, and the repetition period is PRI;
3) the other path of light output by the optical coupler is dropped by the parallel IQ modulator, and two paths of frequency source signals with 90-degree phase difference are used for driving the two paths of the optical IQ modulator I, Q, so that optical single-sideband modulation is realized, and a drop beat frequency optical wave is obtained; the frequency source signal frequency is fs;
4) after the upper path signal light obtained in the step 2) and the lower path beat light obtained in the step 3) pass through an optical coupler, performing beat frequency on a photoelectric balance detector by using the signal light wave and the beat frequency light wave to generate a radio frequency signal with the frequency of the frequency difference of the two light waves;
5) filtering the radio frequency signal of the step 4) by an electric filter to remove harmonic waves, and finally obtaining a radio frequency linear frequency modulation signal with the carrier frequency fs and the bandwidth B.
3. The ultra-wideband electromagnetic environment signal generation method based on the parallel optical IQ modulator as claimed in claim 2, characterized in that the baseband signal modulation mode is chirp.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485893A (en) * | 2014-12-23 | 2015-04-01 | 武汉邮电科学研究院 | Broadband electric signal mixer and method |
| CN106992816A (en) * | 2016-11-04 | 2017-07-28 | 西安电子科技大学 | Photonic propulsion wide-band microwave I/Q modulator and its operating method |
| CN109842451A (en) * | 2017-11-25 | 2019-06-04 | 西安电子科技大学 | The method for realizing the frequency conversion of microwave signal photonics and multichannel phase shift using dual-polarization quadrature phase shift keyed modulators |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485893A (en) * | 2014-12-23 | 2015-04-01 | 武汉邮电科学研究院 | Broadband electric signal mixer and method |
| CN106992816A (en) * | 2016-11-04 | 2017-07-28 | 西安电子科技大学 | Photonic propulsion wide-band microwave I/Q modulator and its operating method |
| CN109842451A (en) * | 2017-11-25 | 2019-06-04 | 西安电子科技大学 | The method for realizing the frequency conversion of microwave signal photonics and multichannel phase shift using dual-polarization quadrature phase shift keyed modulators |
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Application publication date: 20210319 |