CN109450447B - Microwave frequency-halving device based on microwave photon technology - Google Patents
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- H—ELECTRICITY
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- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- H—ELECTRICITY
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Abstract
A microwave frequency-halving device based on microwave photon technology comprises: the optical domain down-conversion module is used for converting the signal to be subjected to frequency division into an electrical domain signal with reduced angular frequency under the action of the auxiliary microwave signal; the electric domain frequency division and mixing module is connected with the optical domain down-conversion module and is used for halving the angular frequency of the electric domain signal and mixing the electric domain signal with an auxiliary microwave signal to generate a halved frequency signal of a signal to be frequency-divided; and the auxiliary microwave module, one end with the optical domain down-conversion module links to each other, and the other end with electric domain frequency division and mixing module links to each other, is used for optical domain down-conversion module and electric domain frequency division and mixing module provide adjustable auxiliary microwave signal to alleviate technical problems such as narrow analog frequency divider frequency division bandwidth, digital frequency divider operating frequency is lower among the prior art, the consumption is great when improving the highest operating frequency of circuit.
Description
Technical Field
The disclosure relates to the field of microwave photonics, in particular to a microwave frequency-halving device based on a microwave photon technology.
Background
With the rapid development of wireless communication systems and other related fields, more wireless communication standard protocols are widely applied. In order to meet the requirements of different protocol standards, research and design of multimode communication systems are attracting more and more attention. In multimode communication systems, a frequency synthesizer for providing a standard reference frequency with high accuracy and stability criteria is the most important point in the overall design. For the frequency synthesizer, the frequency divider is a very important key module, which is related to the highest frequency and frequency range in which the frequency synthesizer can operate.
Traditional frequency dividers based on electrical implementation are mainly divided into two categories: analog frequency dividers and digital frequency dividers. The analog frequency divider is divided into a regenerative frequency divider, a parametric frequency divider, an injection locking frequency divider and the like. The analog frequency divider can work in a higher frequency band, but the frequency division bandwidth is narrow. The basic units constituting the digital frequency divider are a digital counter and a flip-flop, which have simple structure and logic structure, programmable frequency division ratio, and larger operating frequency bandwidth, but lower operating frequency, and increase the highest operating frequency of the circuit, and the power consumption of the circuit will also increase accordingly.
Disclosure of Invention
Technical problem to be solved
Based on the above problems, the present disclosure provides a microwave frequency divider based on microwave photon technology, so as to alleviate the technical problems in the prior art, such as narrow frequency division bandwidth of an analog frequency divider, low working frequency of a digital frequency divider, and high power consumption when the highest working frequency of a circuit is increased.
(II) technical scheme
The present disclosure provides a microwave two-frequency divider based on microwave photon technology, comprising: the optical domain down-conversion module is used for converting the signal to be subjected to frequency division into an electrical domain signal with reduced angular frequency under the action of the auxiliary microwave signal; the electric domain frequency division and mixing module is connected with the optical domain down-conversion module and is used for halving the angular frequency of the electric domain signal and mixing the electric domain signal with an auxiliary microwave signal to generate a halved frequency signal of a signal to be frequency-divided; and the auxiliary microwave module is connected with the optical domain down-conversion module at one end and the electrical domain frequency division and mixing module at the other end, and is used for providing adjustable auxiliary microwave signals for the optical domain down-conversion module and the electrical domain frequency division and mixing module.
In an embodiment of the present disclosure, the optical domain down-conversion module includes: a laser 1 for providing an optical carrier; the first modulator 2 comprises an optical input end, an optical output end, a radio frequency input end and a direct current offset end, wherein the optical input end is connected with the laser 1, and the radio frequency input end is used for modulating a signal to be frequency-divided on an optical carrier input to the first modulator 2 by the laser 1; the second modulator 5 comprises an optical input end, an optical output end, a radio frequency input end and a direct current offset end, wherein an optical input port of the second modulator 5 is connected with the output end of the first modulator 2, and a radio frequency input end of the second modulator 5 is connected with one end of the auxiliary microwave module; an input port of the tunable optical bandpass filter 6 is connected to the optical output port of the second modulator 5, and is configured to receive and filter out a spectral component of the optical signal output by the second modulator 5; and the input port of the photoelectric detector 7 is connected with the output end of the tunable optical bandpass filter 6 and is used for receiving and converting the optical signal output by the tunable optical bandpass filter 6 into a microwave signal.
In an embodiment of the present disclosure, the electrical domain frequency division and mixing module includes: an input end of the electrical frequency halver 8 is connected with an output end of the photoelectric detector 7 of the optical domain down-conversion module, and is used for receiving and halving the frequency of the microwave signal output by the photoelectric detector 7; the electric frequency mixer 9 comprises a radio frequency end, a local oscillator end and an intermediate frequency end, wherein the local oscillator end is connected with the auxiliary microwave module, and the intermediate frequency end is connected with the electric frequency halver 8 and used for receiving the microwave signals output by the electric frequency halver 8 and generating sum frequency and difference frequency signals at the radio frequency end; and an adjustable band-pass filter 10, an input end of which is connected to the radio frequency end of the electrical mixer 9, and configured to receive the microwave signal output by the electrical mixer 9 and filter the microwave signal to obtain a sum frequency signal, i.e., a halved frequency signal.
In an embodiment of the present disclosure, the auxiliary microwave module includes: an adjustable microwave source 3 for providing a microwave signal with adjustable frequency; and the power divider 4 comprises an input end and two output ends, wherein the input end of the power divider is connected with the output end of the adjustable microwave source 3, and the power divider is used for dividing the power of the microwave signal emitted by the adjustable microwave source 3 to two output ports.
In the disclosed embodiment, the laser 1 includes: semiconductor lasers or fiber lasers in a tunable wavelength regime.
In the embodiment of the present disclosure, after the radio frequency input end of the first modulator 2 modulates the signal to be frequency-divided on the optical carrier input to the first modulator 2 by the laser 1, the optical signal output by the optical output end of the laser 1 is composed of the optical carrier, the positive first-order sideband and the negative first-order sideband, and the power of the optical carrier of the optical signal output by the optical output end is equal to the power of the positive first-order sideband and the power of the negative first-order sideband by adjusting the voltage applied to the dc offset end of the first modulator 2.
In the disclosed embodiment, the first modulator 2 type comprises a push-pull mach-zehnder modulator.
In the embodiment of the present disclosure, the type of the second modulator 5 includes a push-pull mach-zehnder modulator, and the carrier power of the output optical signal is suppressed by adjusting the voltage applied to the dc offset terminal thereof, so that the second modulator 5 operates at the minimum transmission point.
In the embodiment of the present disclosure, the bandwidth of the tunable optical bandpass filter 6 is smaller than the angular frequency of the signal to be divided.
In the disclosed embodiments, frequency division is used for microwave signals up to 40 GHz.
(III) advantageous effects
According to the technical scheme, the microwave frequency divider based on the microwave photon technology has at least one or part of the following beneficial effects:
(1) the frequency division of microwave signals up to 40GHz can be realized, and the working bandwidth of the system can be further improved under the condition that the modulator technology is developed;
(2) the system has no output under the condition of no input, so that the interference to the outside is reduced;
(3) the working frequency band of the frequency divider can be changed simply by adjusting the frequency of the microwave signal output by the adjustable microwave source and the bandwidth of the adjustable filter;
(4) high working frequency, large bandwidth, flexible tuning and small external interference.
Drawings
Fig. 1 is a schematic structural diagram of a microwave frequency divider based on microwave photonic technology according to an embodiment of the present disclosure.
Fig. 2 is a spectrum diagram of output signals of each device of a microwave frequency divider based on microwave photonic technology according to an embodiment of the present disclosure. (a) Outputting a signal spectrum structure chart for a laser; (b) outputting a signal spectrum structure chart for the first modulator; (c) outputting a signal spectrum structure chart for an auxiliary microwave module (an adjustable microwave source and a power divider); (d) outputting a signal spectrum structure chart for the second modulator; (e) outputting a signal spectrum structure chart for the adjustable optical band-pass filter 6; (f) outputting a signal spectrum structure chart for the photoelectric detector; (g) outputting a signal spectrum structure chart for the electric frequency divider; (h) outputting a signal spectrum structure chart for the electric mixer; (i) the output signal spectrum structure chart of the adjustable band-pass filter is shown.
[ description of main reference numerals in the drawings ] of the embodiments of the present disclosure
1-a laser; 2-a first modulator; 3-a tunable microwave source; 4-power divider; 5-a second modulator; 6-tunable optical bandpass filter; 7-a photodetector; 8-an electrical divide-by-two divider; 9-an electrical mixer; 10-tunable band pass filter.
Detailed Description
The microwave frequency divider based on the microwave photon technology converts a signal to be frequency divided into a frequency band with relatively low frequency in an optical domain by utilizing the microwave photon technology, finally obtains the frequency-divided signal of the signal to be frequency divided after the frequency division of the microwave frequency divider, a mixer and an adjustable filter, changes the working frequency band of the frequency divider by adjusting the frequency of the microwave signal output by an adjustable microwave source and the bandwidth of the adjustable filter, and overcomes the difficulties of the traditional electronics method in the aspects of bandwidth, noise, power consumption, electromagnetic compatibility and the like.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
In the embodiment of the present disclosure, a microwave frequency divider based on microwave photon technology is provided, and fig. 1 is a schematic structural diagram of a microwave frequency divider based on microwave photon technology; FIG. 2 is a diagram of the spectrum structure of the output signals of each device of the microwave frequency divider based on microwave photon technology; wherein, (a) is a structure diagram of a frequency spectrum of an output signal of the laser 1; (b) outputting a signal spectrum structure chart for the first modulator; (c) outputting a signal spectrum structure chart for an auxiliary microwave module (an adjustable microwave source and a power divider); (d) outputting a signal spectrum structure chart for the second modulator; (e) outputting a signal spectrum structure chart for the adjustable optical band-pass filter 6; (f) outputting a signal spectrum structure chart for the photoelectric detector; (g) outputting a signal spectrum structure chart for the electric frequency divider; (h) outputting a signal spectrum structure chart for the electric mixer; (i) outputting a signal spectrum structure chart for the adjustable band-pass filter; referring to fig. 1 and 2, the microwave frequency divider based on microwave photonic technology includes:
the optical domain down-conversion module is used for converting the signal to be subjected to frequency division into an electrical domain signal with reduced angular frequency under the action of the auxiliary microwave signal;
the electric domain frequency division and mixing module is connected with the optical domain down-conversion module and is used for halving the angular frequency of the electric domain signal and mixing the electric domain signal with an auxiliary microwave signal to generate a halved frequency signal of a signal to be frequency-divided; and
and one end of the auxiliary microwave module is connected with the optical domain down-conversion module, and the other end of the auxiliary microwave module is connected with the electrical domain frequency division and frequency mixing module and is used for providing auxiliary microwave signals for the optical domain down-conversion module and the electrical domain frequency division and frequency mixing module.
The optical domain down-conversion module comprises:
a laser 1 for providing an optical carrier wave having an angular frequency ω c;
the laser 1 includes: a semiconductor laser or fiber laser of tunable wavelength form;
a first modulator 2 connected to the laser 1 and serving as a push-pull mach-zehnder modulator; the first modulator 2 comprises an optical input end, an optical output end, a radio frequency input end and a direct current offset end; the optical carrier emitted by the laser 1 enters the first modulator 2 through the optical input end; the signal to be frequency-divided is loaded on the optical carrier through the radio frequency input end, so that the optical signal output through the optical output end consists of the optical carrier, a positive first-order sideband and a negative first-order sideband, the corresponding angular frequencies are respectively omega c, omega c + omega 0 and omega c-omega 0, and the voltage applied to the direct current offset end of the first modulator 2 can be adjusted to enable the power of the output optical signal carrier to be equal to that of the first-order sideband.
A second modulator 5, connected to the first modulator 2, being a push-pull mach-zehnder modulator;
the second modulator 5 includes an optical input port, an optical output port, a radio frequency input port, and a dc offset port, where the optical input port is connected to the optical output port of the first modulator 2, and the radio frequency input port is connected to an output port of the power divider 4; the second modulator 5 operates in a carrier suppression state, suppresses power at angular frequencies ω c and ω c + ω 0 of the optical signal output from the first modulator 2, and generates new frequency components at angular frequencies ω c + ω m and ω c + ω 0- ω m.
The optical output wavelength of the laser 1 should be within the operating band of the first modulator 2, the second modulator 5.
An input port of the tunable optical bandpass filter 6 is connected to an optical output port of the second modulator 5, and is configured to receive and filter out spectral components with angular frequencies ω c + ω m and ω c + ω 0- ω m newly generated by the second modulator 5;
an input port of the photodetector 7 is connected with an output port of the tunable optical bandpass filter 6, and is configured to receive and convert an optical signal output by the tunable optical bandpass filter 6 into a microwave signal, and an angular frequency of the generated microwave signal is ω 0-2 ω m;
the optical domain down-conversion module is used for recovering the signal to be frequency-divided to the electrical domain for output after the signal to be frequency-divided is subjected to operation processing such as modulation, filtering and detection in the optical domain, and the angular frequency of the output signal is reduced compared with the signal to be frequency-divided;
the electric domain frequency division and mixing module comprises:
an input end of the electrical frequency halver 8 is connected with an output end of the photodetector 7, and is configured to receive and halve the frequency of the microwave signal output by the photodetector 7, and an angular frequency of the generated microwave signal is 1/2 ω 0- ω m;
an electrical mixer 9, including a radio frequency end, a local oscillator end and an intermediate frequency end, where the local oscillator end is connected to one of the output ports of the power divider 4 (the input signal angular frequency is ω m), the intermediate frequency end is connected to the electrical divide-by-two frequency divider 8 (the input signal angular frequency is 1/2 ω 0- ω m), and the radio frequency end generates sum and difference frequency signals (the output signal angular frequencies are 1/2 ω 0 and 1/2 ω 0-2 ω m);
and an input end of the tunable bandpass filter 10 is connected to the radio frequency end of the electrical mixer 9, and is configured to receive the microwave signal output by the electrical mixer 9 and filter the microwave signal to obtain a sum frequency signal, i.e., a halved frequency signal, with an angular frequency of 1/2 ω 0.
The electrical domain frequency division and mixing module changes the angular frequency of the output signal of the optical domain down-conversion module into a half of the angular frequency; and mixing the frequency-divided signal with an external auxiliary microwave module to generate a frequency-divided signal of the signal to be frequency-divided, and selectively outputting the frequency-divided signal.
The auxiliary microwave module includes:
an adjustable microwave source 3 for providing a microwave signal with an angular frequency of ω m;
the power divider 4 comprises an input port and two output ports, wherein the input end of the power divider is connected with the output end of the adjustable microwave source 3, and the power divider is used for equally dividing the power of the adjustable microwave source 3 into the two output ports.
The auxiliary microwave module is used for providing an auxiliary microwave source required by down-conversion for the optical domain down-conversion module; and an auxiliary microwave source for providing frequency mixing for the frequency division and mixing module to generate the two-frequency division signal of the signal to be frequency divided; the adjustable microwave source 3 can adjust the working frequency of the whole microwave frequency divider system by changing the frequency of the output signal, and has low requirements on the working frequency bands of other devices except the modulator.
So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.
From the above description, those skilled in the art should clearly recognize that the present disclosure is based on a microwave-photonic technology microwave frequency-halver.
In summary, the present disclosure provides a microwave frequency divider based on a microwave photon technology, where the microwave frequency divider based on the microwave photon technology converts a signal to be frequency-divided into a frequency band of a relatively low frequency in an optical domain by using the microwave photon technology, and finally obtains a frequency-divided signal of the signal to be frequency-divided through a frequency divider, a mixer, and an adjustable filter, and changes a working frequency band of the frequency divider by adjusting a frequency of a microwave signal output by an adjustable microwave source and a bandwidth of the adjustable filter, thereby overcoming the difficulties in bandwidth, noise, power consumption, electromagnetic compatibility, and the like of the conventional electronic method.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.
In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (9)
1. A microwave frequency-halving device based on microwave photon technology comprises:
the optical domain down-conversion module is used for converting the signal to be subjected to frequency division into an electrical domain signal with reduced angular frequency under the action of the auxiliary microwave signal;
the electric domain frequency division and mixing module is connected with the optical domain down-conversion module and is used for halving the angular frequency of the electric domain signal and mixing the electric domain signal with an auxiliary microwave signal to generate a halved frequency signal of a signal to be frequency-divided; and
an auxiliary microwave module, one end of which is connected with the optical domain down-conversion module and the other end of which is connected with the electrical domain frequency division and mixing module, and which is used for providing adjustable auxiliary microwave signals for the optical domain down-conversion module and the electrical domain frequency division and mixing module;
the optical domain down-conversion module comprises:
a laser (1) for providing an optical carrier;
the first modulator (2) comprises an optical input end, an optical output end, a radio frequency input end and a direct current offset end, wherein the optical input end is connected with the laser (1), the radio frequency input end is used for modulating a signal to be frequency-divided on an optical carrier input to the first modulator (2) by the laser (1), so that an optical signal output through the optical output end consists of the optical carrier, a positive first-order sideband and a negative first-order sideband, and the corresponding angular frequencies are omega c, omega c + omega 0 and omega c-omega 0 respectively;
the second modulator (5) comprises an optical input end, an optical output end, a radio frequency input end and a direct current offset end, an optical input port of the second modulator is connected with the output end of the first modulator (2), and the radio frequency input end of the second modulator (5) is connected with one end of the auxiliary microwave module;
the input port of the tunable optical bandpass filter (6) is connected with the optical output end of the second modulator (5) and is used for receiving and filtering out the spectral components of the optical signal output by the second modulator (5); and
the input port of the photoelectric detector (7) is connected with the output end of the tunable optical bandpass filter (6) and is used for receiving and converting the optical signal output by the tunable optical bandpass filter (6) into a microwave signal;
the second modulator (5) works in a carrier suppression state, suppresses power at angular frequencies ω c and ω c + ω 0 of the optical signal output by the first modulator (2), and generates new frequency components at angular frequencies ω c + ω m and ω c + ω 0- ω m, where ω m is the angular frequency of the microwave signal.
2. The microwave-photonic-based microwave frequency-halver according to claim 1, the electrical-domain frequency dividing and mixing module comprising:
the input end of the electrical frequency divider (8) is connected with the output end of the photoelectric detector (7) of the optical domain down-conversion module and is used for receiving and halving the frequency of the microwave signal output by the photoelectric detector (7);
the electric frequency mixer (9) comprises a radio frequency end, a local oscillator end and an intermediate frequency end, wherein the local oscillator end is connected with the auxiliary microwave module, and the intermediate frequency end is connected with the electric frequency halver (8) and used for receiving the microwave signals output by the electric frequency halver (8) and generating sum frequency and difference frequency signals at the radio frequency end; and
and the input end of the adjustable band-pass filter (10) is connected with the radio frequency end of the electric mixer (9) and is used for receiving the microwave signal output by the electric mixer (9) and filtering to obtain a sum frequency signal, namely a halved frequency signal.
3. The microwave photonic technology-based microwave frequency halver according to claim 1, the auxiliary microwave module comprising:
an adjustable microwave source (3) for providing a frequency adjustable microwave signal; and
the power divider (4) comprises an input end and two output ends, wherein the input end of the power divider is connected with the output end of the adjustable microwave source (3), and the power divider is used for dividing the power of the microwave signal emitted by the adjustable microwave source (3) to two output ports.
4. The microwave-photonic-based microwave frequency-halver according to claim 1, the laser (1) comprising: semiconductor lasers or fiber lasers in a tunable wavelength regime.
5. The microwave two-frequency divider based on the microwave photonic technology according to claim 1, wherein after the radio frequency input end of the first modulator (2) modulates the signal to be frequency divided onto the optical carrier input to the first modulator (2) by the laser (1), the optical signal output by the optical output end of the laser (1) consists of the optical carrier, a positive first-order sideband and a negative first-order sideband, and the powers of the optical carrier, the positive first-order sideband and the negative first-order sideband of the optical signal output by the optical output end are made equal by adjusting the voltage applied to the dc offset end of the first modulator (2).
6. Microwave frequency-halver based on microwave photonic technology according to claim 1, the first modulator (2) type comprising a push-pull mach-zehnder modulator.
7. The microwave frequency-halver based on microwave photonic technology according to claim 1, wherein the second modulator (5) type comprises a push-pull mach-zehnder modulator, and the second modulator (5) operates at the minimum transmission point by adjusting the voltage applied to the dc offset terminal thereof to suppress the carrier power of the output optical signal.
8. Microwave frequency halver based on microwave photonic technology according to claim 1, the tunable optical bandpass filter (6) bandwidth being smaller than the angular frequency of the signal to be divided.
9. The microwave-photonic-based microwave frequency-halver according to claim 1, for frequency division of microwave signals up to 40 GHz.
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