CN112838894B - Photoelectric fusion large dynamic reconfigurable frequency conversion device and method - Google Patents
Photoelectric fusion large dynamic reconfigurable frequency conversion device and method 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
Abstract
A photoelectric fusion large dynamic reconfigurable frequency conversion device and method includes: the device comprises a laser, an adjustable optical splitter, an adjustable electrical splitter, a first electro-optic modulation unit, a second electro-optic modulation unit, a first direct current bias control unit, a second direct current bias control unit, a local oscillator signal source, a fixed electrical splitter, a first optical amplification unit, a second optical amplification unit, a photoelectric receiving unit and an adjustable electrical filtering unit. The adjustable electric branching unit and the adjustable optical branching unit respectively distribute the power ratio of the signals to be frequency-converted entering the first electro-optical modulation unit and the second electro-optical modulation unit and the power ratio of input light waves, so that the elimination of three-order intermodulation stray components in the frequency conversion process is realized, and a large stray-free dynamic range is obtained. According to different applications, the down-conversion and up-conversion are flexibly reconstructed by switching the switch to work in a low-pass or high-pass mode. The invention solves the problems of small stray-free dynamic range, low frequency conversion efficiency and the like of the conventional photon frequency conversion system, and has the capability of flexibly reconstructing up and down frequency conversion.
Description
Technical Field
The invention belongs to the technical field of radio frequency signal processing, and relates to a photoelectric fusion large dynamic reconfigurable frequency conversion device and method.
Background
The frequency conversion is one of the important functions of radio frequency signal processing, and compared with the traditional electrical frequency conversion technology, the photon frequency conversion technology has the advantages of low loss, large bandwidth, high electromagnetic interference resistance and the like, and has wide application prospects in the fields of satellite communication, mobile communication, radar systems and the like.
The basic process of photon frequency conversion is that microwave signals are first electro-optically modulated and converted into an optical domain, the signals are processed in the optical domain, and finally the frequency-converted signals are output through photoelectric detection. Photon frequency conversion has the advantage of large processing bandwidth, can realize the frequency conversion of microwave signals of a plurality of frequency bands to a target frequency band at one time, and solves the problems of complex system and the like caused by multiple frequency conversion in the electrical frequency conversion technology.
Generally, in a photon frequency conversion system, due to the nonlinear response of an optoelectronic device, in addition to a desired target signal, other nonlinear spurious components, especially third-order intermodulation spurious components, can be generated in an output signal, and due to the fact that the nonlinear spurious components are difficult to filter by a filter, the nonlinear spurious components become important factors for limiting the dynamic range of the photon frequency conversion system, and the nonlinear spurious components are greatly concerned by scientific research and engineering technicians for a long time.
In the prior art [1] (c.k.sun, r.j.orazi, s.a.pappper, and w.k.burns, "adaptive-link millimeter-wave mixer using modulated optical modulators and harmonic carrier generation," IEEE photon.technol.lett., vol.8, No.9, pp.1166-1168, sep.1996.), two electro-optical intensity modulators are cascaded, and a local oscillator signal and a radio frequency signal are subjected to double sideband modulation on the two modulators, respectively, and then the function of frequency conversion is realized through photoelectric detection. The insertion loss of the two cascaded modulators is large, the power of the optical carrier adopting the double-sideband modulation mode is high, and the optical carrier does not carry information of local oscillators or radio frequency signals, so the frequency conversion efficiency of the scheme is low. In addition, the scheme does not consider the dynamic range of the frequency conversion system.
In the prior art [2] (p.x.li, w.pan, x.h.zuo, s.pan, b.luo, and l.s.yan, "High-efficiency photonic microwave down conversion with full-frequency-range conversion," IEEE photo n.j., vol.7, No.4, pp.1-7, and aug.2015.), the local oscillator signal and the radio frequency signal are respectively subjected to double-sideband modulation on the two modulators by cascading the two polarization modulators, and the optical carriers in the two modulators are in a 180 ° phase inversion state by adjusting the polarization controllers to cancel each other, so as to realize a carrier suppression function and improve the conversion efficiency of the frequency conversion system. The scheme adopts a mode of cascading electro-optical modulators to bring larger third-order intermodulation nonlinear distortion, but measures for inhibiting the third-order intermodulation distortion are not adopted, so that the spurious-free dynamic range of the system is limited.
In the prior art [3] (y.c.shao, x.y.han, m.li, q.liu, and m.s.zhao.microwave down conversion by a tunable optoelectronic oscillator based on PS-FBG and polarization-multiplexed dual loop [ J ]. IEEE Transactions on Microwave Theory and Techniques, vol.67, No.5, 209. pp.5-2102, May,2019.), a photonic down conversion is directly realized in a photonic down conversion system by constructing an optoelectronic oscillator composed of a tunable laser, a phase modulator and a phase-shifted fiber grating, and adopting an offset multiplexing dual-loop structure in the loop to generate a local oscillator signal with high side mode rejection ratio, low phase noise and tunable frequency without an external local oscillator signal source. Although the testing analyzes the spurious-free dynamic range of the frequency conversion system, no measures are given for suppressing the third-order intermodulation spurious component.
Disclosure of Invention
The invention provides a photoelectric fusion large dynamic reconfigurable frequency conversion device and method, which effectively solve the problems of small spurious-free dynamic range, low conversion efficiency and the like in the background technology and have flexible reconfiguration capability of up-conversion or down-conversion.
The technical scheme adopted by the invention for solving the problems is as follows:
a photoelectric fusion large dynamic reconfigurable frequency conversion device comprises: the device comprises a laser, an adjustable optical splitter, an adjustable electrical splitter, a first electro-optic modulation unit, a second electro-optic modulation unit, a first direct current bias control unit, a second direct current bias control unit, a local oscillator signal source, a fixed electrical splitter, a first optical amplification unit, a second optical amplification unit, a photoelectric receiving unit and an adjustable electrical filtering unit.
The first electro-optical modulation unit and the second electro-optical modulation unit are provided with double radio frequency input ports which are respectively used for inputting the local oscillation signal and the signal to be frequency-converted, so that the function of converting the electro-optical modulation of the local oscillation signal and the signal to be frequency-converted into the optical domain is realized.
The first electro-optical modulation unit controls the work at the minimum bias working point through the first direct current bias control unit, and the carrier suppression double-sideband modulation function of the upper-branch local oscillation signal and the signal to be frequency-converted is achieved. The second electro-optical modulation unit controls the second direct-current bias control unit to work at the minimum bias working point, and the carrier suppression double-sideband modulation function of the lower branch local oscillation signal and the signal to be frequency-converted is achieved.
The adjustable optical branching unit is used for distributing the optical power ratio entering the first electro-optical modulation unit and the second electro-optical modulation unit so as to meet the optical power matching condition for restraining the three-order intermodulation stray components in the frequency conversion process.
The adjustable electric shunt is used for distributing the power ratio of the signals to be frequency-converted entering the first electro-optical modulation unit and the second electro-optical modulation unit so as to meet the electric power matching condition for inhibiting the three-order intermodulation stray components in the frequency conversion process.
The first optical amplification unit amplifies a carrier suppression double sideband signal output by the first electro-optical modulation unit in an optical domain; and the second optical amplification unit amplifies the carrier suppression double sideband signal output by the first electro-optical modulation unit in an optical domain.
The photo-reception unit includes a first photo-detector and a second photo-detector. The first photoelectric detector is used for receiving the amplified carrier suppression double-sideband signal output by the first optical amplification unit, performing photoelectric conversion and outputting an electric signal. The second photoelectric detector is used for receiving the amplified carrier suppression double-sideband signal output by the second optical amplification unit, performing photoelectric conversion and outputting an electric signal. The first photoelectric detector and the second photoelectric detector are connected through a differential circuit, and elimination of three-order intermodulation stray components in the frequency conversion process is completed through differential combination.
The adjustable electric filtering unit has two working modes of a low-pass mode and a high-pass mode and is switched by adopting a switch. The low-pass mode is set for gating the down-conversion electric signal output by the photoelectric receiving unit to realize the down-conversion function; and the up-conversion circuit is arranged in a high-pass mode and is used for gating the up-conversion electric signals output by the photoelectric receiving unit to realize the up-conversion function.
The laser, the adjustable optical splitter, the first electro-optical modulation unit, the second electro-optical modulation unit, the first optical amplification unit, the second optical amplification unit and the photoelectric receiving unit are connected in sequence through optical links respectively.
The photoelectric receiving unit is connected with the tunable electric filtering unit through an electric link.
The method for realizing the large dynamic reconfigurable frequency conversion by the microwave photon frequency conversion device comprises the following steps:
the light wave emitted by the laser is divided into two paths through the adjustable optical splitter; the upper path light wave is input into a first electro-optical modulation unit; the downlink optical wave is input into the second electro-optical modulation unit.
The local oscillator signal output by the local oscillator signal source is divided into two paths through the fixed electric power divider, one path of local oscillator signal is input to the first electro-optical modulation unit, and the other path of local oscillator signal is input to the second electro-optical modulation unit.
The radio frequency signal or the intermediate frequency signal to be subjected to frequency conversion is divided into two paths through an adjustable electrical shunt, one path of radio frequency signal or intermediate frequency signal is input to the first electro-optical modulation unit, and the other path of radio frequency signal or intermediate frequency signal is input to the second electro-optical modulation unit;
the first direct current bias control unit controls the first electro-optical modulation unit to work at the minimum bias working point, so that the carrier suppression modulation function of the radio frequency signal or the intermediate frequency signal and the local oscillator signal is realized, and a carrier suppression double-sideband signal is output. The second direct current bias control unit controls the second electro-optical modulation unit to work at the minimum bias working point, so that the carrier suppression modulation function of the radio frequency signal or the intermediate frequency signal and the local oscillation signal is realized, and a carrier suppression double-side-band signal is output.
The carrier suppression double-sideband signal output by the first electro-optical modulation unit is amplified by the first optical amplification unit and then transmitted to the first photoelectric detector in the photoelectric receiving unit, so that photoelectric conversion is completed and an electric signal is output.
The carrier suppression double-sideband signal output by the second electro-optical modulation unit is amplified by the second optical amplification unit and then transmitted to the second photoelectric detector in the photoelectric receiving unit, so that photoelectric conversion is completed and an electric signal is output.
The optical power distribution ratio of the two ports of the adjustable optical splitter to the first electro-optical modulation unit and the second electro-optical modulation unit is adjusted, the electric power distribution ratio of the two ports of the adjustable optical splitter to the first electro-optical modulation unit and the second electro-optical modulation unit is adjusted, the amplitude of the frequency conversion three-order intermodulation stray component in the frequency spectrum of the output electric signals of the first photoelectric detector and the second photoelectric detector is the same, and the frequency conversion three-order intermodulation stray component output by the first photoelectric detector and the frequency conversion three-order intermodulation stray component output by the second photoelectric detector are offset through a differential combination way, so that the three-order intermodulation stray component is eliminated in the frequency conversion process, and the frequency conversion function with a large dynamic range is obtained.
When the input signal to be frequency-converted is a radio-frequency signal, the switch of the adjustable electric filtering unit is switched to a low-pass mode, and the intermediate-frequency signal after down-conversion is selected to be output, so that the down-conversion function is realized; when the input signal to be frequency-converted is an intermediate frequency signal, the switch of the adjustable electrical filtering unit is switched to a high-pass mode, and the radio-frequency signal after up-conversion is selected to be output, so that the up-conversion function is realized; the dynamic reconfiguration functions of down-conversion and up-conversion are realized by switching and selecting the switch of the working mode of the adjustable electrical filtering unit.
The invention has the beneficial effects that: the invention reasonably sets the optical power distribution ratio and the electric power distribution ratio of the two electro-optical modulation units, eliminates the three-order intermodulation nonlinear stray components in the frequency conversion by adopting the photoelectric differential receiving, simultaneously inhibits the common mode noise of the system, and effectively improves the stray-free dynamic range of the frequency conversion system. The electro-optical modulation unit adopts a carrier suppression double-sideband modulation mode and adopts optical domain amplification to provide gain for carrier suppression double-sideband signals, thereby effectively improving the conversion efficiency of a frequency conversion system and ensuring the high gain capability of frequency conversion. The low-pass or high-pass function switch of the electric filtering unit is used for switching and setting up to select up-conversion or down-conversion, and the reconfigurable capability of the frequency conversion system is improved.
Drawings
Fig. 1 is a structural diagram of a photoelectric fusion large dynamic reconfigurable frequency conversion device.
Fig. 2 is a spectral diagram of an optical domain of a carrier-suppressed double sideband signal output by the first electro-optical modulation unit.
Fig. 3 is a spectral diagram of an optical domain of a carrier suppressed double sideband signal output by the second electro-optical modulation unit.
Fig. 4 is a frequency spectrum diagram of the first photodetector in the photo-receiving unit outputting an up-converted two-tone signal.
Fig. 5 is a frequency spectrum diagram of the second photodetector in the photo-receiving unit outputting an up-converted two-tone signal.
Fig. 6 is a spectrum diagram of an up-converted two-tone signal output by the differential combining of the photoelectric receiving units.
FIG. 7 is a spurious free dynamic range test result of the first photodetector output upconverted signal in the photoreceiving unit.
Fig. 8 shows the results of a spurious-free dynamic range test of the up-converted signal output by the differential combining of the photo-reception units.
Fig. 9 is a diagram of the electrical domain spectrum output by the optical-electrical receiving unit under the down-conversion process.
Fig. 10 is a graph of the frequency spectrum of the output of the tunable electrical filter under down conversion processing.
Fig. 11 is a graph of the electric domain spectrum output by the photoelectric receiving unit under the up-conversion process.
Fig. 12 is a graph of the spectrum of the output of the tunable electrical filter under the up-conversion process.
In the figure: 1, a laser; 2, an adjustable optical splitter; 3 an adjustable electrical shunt; 4 a first electro-optical modulation unit; 5 a second electro-optical modulation unit; 6 a first direct current bias control unit; 7 a second dc bias control unit; 8, local oscillation signal source; 9 fixing an electrical shunt; 10 a first light amplifying unit; 11 a second light amplification unit; 12 a photoelectric receiving unit; 12-1 a first photodetector; 12-2 a second photodetector; 13 a tunable electrical filtering unit.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The invention discloses a photoelectric fusion large dynamic reconfigurable frequency conversion device, which comprises the following components as shown in figure 1: the device comprises a laser 1, an adjustable optical splitter 2, an adjustable electrical splitter 3, a first electro-optic modulation unit 4, a second electro-optic modulation unit 5, a first direct current bias control unit 6, a second direct current bias control unit 7, a local oscillation signal source 8, a fixed electrical splitter 9, a first optical amplification unit 10, a second optical amplification unit 11, a photoelectric receiving unit 12 (comprising a first photoelectric detector 12-1 and a second photoelectric detector 12-2) and an adjustable electrical filtering unit 13.
The laser 1, the adjustable optical splitter 2, the first electro-optic modulation unit 4, the second electro-optic modulation unit 5, the first optical amplification unit 10, the second optical amplification unit 11, and the photoelectric receiving unit 12 are sequentially connected through an optical link.
The photoelectric receiving unit 12 is connected with the tunable electric filtering unit 13 through an electric link.
Example 1: up-conversion, elimination of three-order intermodulation stray components and improvement of a stray-free dynamic range.
The light wave emitted by the laser is divided into two paths through the adjustable optical branching unit, and the upper path light wave is input to the first electro-optical modulation unit; the downlink optical wave is input to the second electro-optical modulation unit.
Two tone intermediate frequency signal (f)IF1＝2GHz，fIF22.1GHz) is divided into two paths through an adjustable electric splitter, one path is input into a first electro-optical modulation unit, and the other path is input into a second electro-optical modulation unit; local oscillator signal (f) output by local oscillator signal sourceLO21GHz) is equally divided into two paths through the fixed electric power divider, one path is input to the first electro-optical modulation unit, and the other path is input to the second electro-optical modulation unit.
The first direct current bias control unit controls the first electro-optical modulation unit to work at the minimum bias working point, so that the carrier suppression modulation function of the intermediate frequency signal and the local oscillation signal is realized, and a carrier suppression double-sideband signal is output, wherein the frequency spectrum is shown in fig. 2. The second dc offset control unit controls the second electro-optical modulation unit to operate at the minimum offset operating point, so as to implement the function of carrier suppression modulation on the dual-tone intermediate frequency signal and the local oscillator signal, and output a carrier suppression dual-sideband signal, where the frequency spectrum is as shown in fig. 3.
The carrier-suppressed double-sideband signal output by the first electro-optical modulation unit is amplified by the first optical amplification unit and then transmitted to the first photodetector of the photoelectric receiving unit, so that photoelectric conversion is completed and an electrical signal is output, and the frequency spectrum is shown in fig. 4. As can be seen from fig. 4, except for the upconverted target signal fRF1＝fIF1+fLO23GHz and fRF2＝fIF2+fLO23.1GHz, and further comprises a third-order intermodulation stray component 2fRF1-fRF222.9GHz and 2fRF2-fRF1＝23.2GHz。
The carrier suppression double-sideband signal output by the second electro-optical modulation unit is amplified by the second optical amplification unit and then transmitted to the optical-electrical connectorAnd the second photoelectric detector of the receiving unit completes photoelectric conversion and outputs an electric signal to offset the three-order intermodulation stray components output by the first photoelectric detector. The optical power distribution ratio of the adjustable optical splitter to the first electro-optical modulation unit and the second electro-optical modulation unit and the electric power distribution ratio of the adjustable optical splitter to the first electro-optical modulation unit and the second electro-optical modulation unit are set, so that the amplitude of the third-order intermodulation stray component in the electric signal output by the second photoelectric detector is the same as the amplitude of the third-order intermodulation stray component in the electric signal output by the first photoelectric detector. FIG. 5 shows the spectrum of the output electrical signal of the second photodetector, in which the third-order intermodulation spurious component 2f can be seenRF1-fRF222.9GHz and 2fRF2-fRF123.2GHz, and the third-order intermodulation stray component 2f in the output electrical signal of the first photodetector shown in fig. 4RF1-fRF222.9GHz and 2fRF2-fRF1The amplitudes are respectively the same for 23.2 GHz. The electric signals output by the first photoelectric detector and the second photoelectric detector are combined differentially, and three-order intermodulation stray components are offset with each other.
The electrical signal output by the photodetection unit is transmitted to the adjustable electrical filtering unit, and the adjustable electrical filtering unit operates in the high-pass mode, and the output spectrum is as shown in fig. 6. As can be seen from fig. 6, only the up-converted signal f is present in the output signal spectrumRF1＝fIF1+fLO23GHz and fRF2＝fIF2+fLO23.1GHz without third-order intermodulation stray component 2fRF1-fRF222.9GHz and 2fRF2-fRF123.2GHz, indicating that the up-conversion function is implemented and the third order intermodulation spurious components are eliminated.
In order to clearly show the effect of the device on improving the spurious-free dynamic range of the frequency conversion system, the spurious-free dynamic range of the frequency conversion system consisting of the first electro-optical modulator, the first optical amplification unit and the first photoelectric detector is tested, and as a result, as shown in fig. 7, the spurious-free dynamic range is 91.1dB · Hz, which can be seen2/3. FIG. 8 shows the results of testing the spur-free dynamic range of the frequency conversion system according to the embodiment of the present invention, and it can be seen that the spur-free dynamic range isThe range is 108dB Hz4/5. Comparing fig. 8 and fig. 7, it can be seen that the spurious-free dynamic range of the up-conversion system of the embodiment of the present invention is improved by 16.9 dB.
Example 2: and (4) reconstructing an up-conversion function and a down-conversion function.
The frequency of the local oscillator signal source is kept unchanged at 21 GHz. When the frequency of the signal to be frequency-converted entering the adjustable electrical shunt is fRFThe frequency spectrum of the output electric signal of the photoelectric receiving unit is as shown in fig. 9, the adjustable electric filter is set to work in a low-pass mode, and the output frequency spectrum is as shown in fig. 10. It can be seen from fig. 10 that the frequency of the frequency-converted signal is 3GHz, and the down-conversion function is realized.
When the frequency of the signal to be frequency-converted entering the adjustable electrical splitter is 4GHz, the frequency spectrum of the electrical signal output by the photoelectric receiving unit is as shown in fig. 11, the adjustable electrical filter is set to operate in the high-pass mode, and the frequency spectrum output by the adjustable electrical filter is as shown in fig. 12. It can be seen from fig. 12 that the frequency of the frequency-converted signal is 25GHz, and the up-conversion function is realized.
In summary, according to different objectives of the frequency conversion application, the down-conversion function and the up-conversion function can be flexibly reconfigured by switching the adjustable electrical filter to operate in the low-pass mode or the high-pass mode.
The above description is further detailed in connection with the preferred embodiments of the present invention, and it is not intended to limit the practice of the invention to these descriptions. It will be apparent to those skilled in the art that various modifications, additions, substitutions, and the like can be made without departing from the spirit of the invention.
Claims (2)
1. A photoelectric fusion large dynamic reconfigurable frequency conversion device is characterized by comprising: the device comprises a laser (1), an adjustable optical branching unit (2), an adjustable electrical branching unit (3), a first electro-optic modulation unit (4), a second electro-optic modulation unit (5), a first direct current bias control unit (6), a second direct current bias control unit (7), a local oscillator signal source (8), a fixed electrical branching unit (9), a first optical amplification unit (10), a second optical amplification unit (11), a photoelectric receiving unit (12) and an adjustable electrical filtering unit (13);
the first electro-optical modulation unit (4) and the second electro-optical modulation unit (5) are respectively provided with a double radio frequency input port and are respectively used for inputting a local oscillation signal and a signal to be frequency-converted so as to realize the function of converting the electro-optical modulation of the local oscillation signal and the signal to be frequency-converted into an optical domain;
the first electro-optical modulation unit (4) controls the work at the minimum bias working point through the first direct current bias control unit (6) to realize the carrier suppression double-sideband modulation function of the upper-branch local oscillation signal and the signal to be frequency-converted; the second electro-optical modulation unit (5) controls the work at the minimum bias working point through a second direct current bias control unit (7) to realize the carrier suppression double-sideband modulation function of the local oscillation signal of the lower branch circuit and the signal to be frequency-converted;
the adjustable optical branching unit (2) is used for distributing the optical power ratio entering the first electro-optical modulation unit (4) and the second electro-optical modulation unit (5) so as to meet the optical power matching condition for suppressing the third-order intermodulation stray components in the frequency conversion process;
the adjustable electric shunt (3) is used for distributing the power ratio of the signals to be frequency-converted entering the first electro-optical modulation unit (4) and the second electro-optical modulation unit (5) so as to meet the electric power matching condition for inhibiting the third-order intermodulation stray components in the frequency conversion process;
the first optical amplification unit (10) amplifies the carrier suppression double sideband signal output by the first electro-optical modulation unit (4) in an optical domain; the second optical amplification unit (11) amplifies the carrier suppression double sideband signal output by the second electro-optical modulation unit (5) in an optical domain;
the photoelectric receiving unit (12) comprises a first photoelectric detector (12-1) and a second photoelectric detector (12-2); the first photoelectric detector (12-1) is used for receiving the amplified carrier suppression double-sideband signal output by the first optical amplification unit (10), performing photoelectric conversion and outputting an electric signal; the second photoelectric detector (12-2) is used for receiving the amplified carrier suppression double-sideband signal output by the second optical amplification unit (11), performing photoelectric conversion and outputting an electric signal; the first photoelectric detector (12-1) and the second photoelectric detector (12-2) are connected through a differential circuit, and elimination of three-order intermodulation stray components in the frequency conversion process is completed through differential combination;
the adjustable electric filtering unit (13) has two working modes of a low-pass mode and a high-pass mode and is switched by adopting a switch; the low-pass mode is set for gating the down-conversion electric signal output by the photoelectric receiving unit (12) to realize the down-conversion function; the device is arranged in a high-pass mode and is used for gating the up-conversion electric signal output by the photoelectric receiving unit (12) to realize the up-conversion function;
the laser (1) is connected with the adjustable optical branching unit (2) through an optical link, the adjustable optical branching unit (2) is respectively connected with the first electro-optical modulation unit (4) and the second electro-optical modulation unit (5) through the optical link, and the first electro-optical modulation unit (4) and the second electro-optical modulation unit (5) are respectively connected with the first optical amplification unit (10) and the second optical amplification unit (11) and then are respectively connected with the photoelectric receiving unit (12) through the optical link;
the photoelectric receiving unit (12) is connected with the adjustable electric filtering unit (13) through an electric link.
2. The method for realizing the large dynamic reconfigurable frequency conversion by the photoelectric fusion large dynamic reconfigurable frequency conversion device of claim 1 is characterized by comprising the following steps:
the light wave emitted by the laser (1) is divided into two paths through the adjustable optical branching unit (2); the upper light wave is input to a first electro-optical modulation unit (4); the downlink optical wave is input to a second electro-optical modulation unit (5);
the local oscillation signal output by the local oscillation signal source (8) is divided into two paths through a fixed electrical shunt (9), one path of local oscillation signal is input to the first electro-optical modulation unit (4), and the other path of local oscillation signal is input to the second electro-optical modulation unit (5);
a radio frequency signal or an intermediate frequency signal to be subjected to frequency conversion is divided into two paths through an adjustable electric shunt (3), one path of the radio frequency signal or the intermediate frequency signal is input into a first electro-optical modulation unit (4), and the other path of the radio frequency signal or the intermediate frequency signal is input into a second electro-optical modulation unit (5);
the first direct current bias control unit (6) controls the first electro-optical modulation unit (4) to work at a minimum bias working point, so that the carrier suppression modulation function of the radio frequency signal or the intermediate frequency signal and the local oscillator signal is realized, and a carrier suppression double-sideband signal is output; the second direct current bias control unit (7) controls the second electro-optical modulation unit (5) to work at the minimum bias working point, so that the carrier suppression modulation function of the radio frequency signal or the intermediate frequency signal and the local oscillator signal is realized, and a carrier suppression double-sideband signal is output;
the carrier suppression double-sideband signal output by the first electro-optical modulation unit (4) is amplified by the first optical amplification unit (10) and then transmitted to the first photoelectric detector (12-1) in the photoelectric receiving unit (12), so that photoelectric conversion is completed and an electric signal is output;
the carrier suppression double-sideband signal output by the second electro-optical modulation unit (5) is amplified by a second optical amplification unit (11) and then transmitted to a second photoelectric detector (12-2) in a photoelectric receiving unit (12) to complete photoelectric conversion and output an electric signal;
the amplitude of frequency conversion third-order intermodulation stray components in the frequency spectrum of an output electric signal of the first photoelectric detector (12-1) and the second photoelectric detector (12-2) is the same by adjusting the optical power distribution ratio of two ports of the adjustable optical splitter (2) to the first electro-optical modulation unit (4) and the second electro-optical modulation unit (5) and simultaneously adjusting the electric power distribution ratio of two ports of the adjustable electrical splitter (3) to the first electro-optical modulation unit (4) and the second electro-optical modulation unit (5); through differential combining, the frequency conversion third-order intermodulation stray component output by the first photoelectric detector (12-1) and the frequency conversion third-order intermodulation stray component output by the second photoelectric detector (12-2) are cancelled out, so that the elimination of the third-order intermodulation stray component in the frequency conversion process is realized, and the frequency conversion function with a large dynamic range is obtained;
when the input signal to be frequency-converted is a radio frequency signal, the switch of the adjustable electric filtering unit (13) is switched to a low-pass mode, and the intermediate frequency signal after down-conversion is selected to be output, so that the down-conversion function is realized; when the input signal to be frequency-converted is an intermediate frequency signal, the switch of the adjustable electric filtering unit (13) is switched to a high-pass mode, and the radio-frequency signal after up-conversion is selected to be output, so that the up-conversion function is realized; the dynamic reconfiguration function of down-conversion and up-conversion is realized by switching and selecting the switch of the working mode of the adjustable electric filtering unit (13).
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