CN104601240B - System and method for generating millimeter waves based on chalcogenide glass optical fiber four-wave mixing effect - Google Patents
System and method for generating millimeter waves based on chalcogenide glass optical fiber four-wave mixing effect Download PDFInfo
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Abstract
The invention discloses a system and a method for generating millimeter waves based on a chalcogenide glass optical fiber four-wave mixing effect. A laser device generates a continuous light carrier signal which is input into a dual-electrode mach-zehnder modulator; a power divider divides a modulation microwave signal into two microwave signals, wherein one microwave signal is input into one electrode of the dual-electrode mach-zehnder modulator, while the other one microwave signal is input into a phase shifter to be inverted in phase by 180 degrees and then input into the other electrode of the dual-electrode mach-zehnder modulator; the optical waves of two sidebands modulated by the dual-electrode mach-zehnder modulator are orderly amplified and filter and then input into a chalcogenide glass optical fiber; the optical waves of two sidebands have the four-wave mixing effect to generate a comb-like optical wave which is filtered to obtain two desired optical frequency components, and the two desired optical frequency components are input into an optical attenuator so that the optical powder can be adjusted to 0dBm, and then the two desired optical frequency components are input into a photoelectric detector for frequency beating, and finally, high-frequency millimeter waves can be output. The system and the method have the advantages of reducing the frequency of the modulation microwave signal source and the bandwidth requirement of the device, and reducing the cost.
Description
Technical field
The present invention relates to a kind of photoproduction millimeter wave generation technique, especially relate to a kind of mixed based on chalcogenide glass fiber four ripple
The millimeter wave of frequency effect generates system and method.
Background technology
Fiber optic communication has the characteristic of low-loss, high bandwidth, and optical fiber radio (ROF) technology is to answer high-speed high capacity wireless
Communication requirement, the emerging wireless access technology that fiber optic communication and radio communication are combined together growing up.Optical-fiber wireless
The Radio Access Network with ultra-wide band that electric (ROF) system is constituted realizes long distance between central processing station and base station by optical fiber
From connection, realize the wireless coverage of tens meters of scopes by microwave, millimeter-wave systems.At present, many countries are by 59-
The millimere-wave band of 64GHz is assigned exclusively to the ROF technology application of unlicensed, has significantly promoted the development of millimere-wave band ROF technology.
It is to realize one of key technology of millimere-wave band ROF system that high-quality millimeter-wave signal generates.But make narrow linewidth, low phase position
When noise, high stability and tunable millimetre-wave signal, the requirement to technique is high, and millimeter wave generates ratio under electrical domain
More difficult, face the electronic bottleneck that cannot break through.In addition, the ripe commercialization electrooptic modulator of directly modulation millimeter-wave signal
Extremely rare and expensive.Therefore study and how to be always millimeter using the carrier signal that optical means produces millimere-wave band
Hot issue in wave band RoF research field.Produce millimeter wave with optical method, be on the one hand in order at the consideration of cost,
On the other hand, millimeter wave processes relatively difficult under electrical domain, face the electronic bottleneck that cannot break through, and is produced with optics
Millimeter wave, not only has the advantages that phase noise is low, and because the loss of optical fiber is very little, signal can long-distance transmissions,
It is easy to be assigned to far-end and launched by antenna.
At present, the technology of optics generation millimeter wave mainly has light heterodyne technology, external modulation technology and optical frequency-doubling technology etc..
The general principle of light heterodyne technology is the light carrier of the frequency being equal to required millimeter wave using two difference on the frequencies, in photodetector
Middle beat frequency generates millimeter wave, and the method needs the phase place of two light carriers highly stable and related, needs extra phase when realizing
Position locking module is it is difficult to obtain the high-quality millimeter wave of low phase noise.External modulation technology is non-linear based on external modulator
Response, produces sideband frequency, obtains millimeter-wave signal in receiving terminal by sideband beat frequency, including double sideband modulation, single sideband modulation
With carrier suppressed modulation etc..External modulator has Mach-increasing Dare modulator (MZM), electroabsorption modulator and phase-modulator etc..
But this method needs very high-frequency modulated microwave signal source, and difficulty is realized greatly in high-frequency microwave signal source, system cost
Too high.Comparatively, optical frequency-doubling technology has more advantage.Optical frequency-doubling technology is by various external modulation devices and some other light
Learn processing apparatus to modulate lower frequency microwave signals on light wave, and produce higher hamonic wave optical sideband, finally by photodetector
Beat frequency produces targeted high frequency millimeter-wave signal.In this kind of scheme, the live width of millimeter-wave signal and phase noise that frequency multiplication produces
All it is maintained at same order etc. characteristic with modulated microwave signal, and unrelated with optics used, overcome electronics frequency multiplier
Part response frequency and the restriction of bandwidth, and phase noise is low.Meanwhile, the intensity modulator needing in scheme, phase place are adjusted
The optics such as device processed and semiconductor optical amplifier is ripe commercialized device common on the market, and therefore scheme is realized simply
And stability is high, relatively common in millimeter wave ROF system.
The millimeter wave of existing Application Optics frequency doubling technology generates system typical scenario and includes：Adjusted using Mach-increasing Dare
Device processed produces quadruple millimeter-wave signal with filters in series；Produce quadruple millimeter-wave signal using two MZM cascades；Using
Two phase-modulator generation in parallel six frequency doubling millimetre wave signals etc..But, these millimeter waves generate the frequency that system is realized
Still relatively low and need multiple modulators it is still desirable to the modulated microwave signal source of upper frequency, system cost is difficult to drop
Low, greatly limit the application of this technology.
Content of the invention
One of the technical problem to be solved be provide a kind of based on chalcogenide glass fiber four-wave mixing effect
Millimeter wave generates system, and this millimeter wave generates system and adopts external modulation technology to combine chalcogenide glass fiber four-wave mixing effect in fact
The up conversion of existing frequency, produces the millimeter-wave signal of six frequency multiplication even more high frequencys multiplication, substantially reduces the frequency in modulated microwave signal source
Rate, overcomes microwave-driven signal frequency and the modulator bandwidth problem producing millimeter wave in optical fiber radio communication technology, reduces system
System bandwidth of a device requires, and reduces system cost.
The technical scheme that the present invention solves that one of above-mentioned technical problem adopted is：One kind is based on chalcogenide glass fiber four ripple
The millimeter wave of mixing effect generates system, including the laser instrument for producing the continuous optical carrier that luminous power is 0dBm, use
In modulated microwave signal being divided into the power splitter of two way microwave signals, is used for the phase shifter of microwave signal phase shift 180 degree, double electricity
Pole Mach-increasing Dare modulator, for luminous power is amplified to the erbium-doped fiber amplifier of 25dBm, the first optical filter, sulphur system
Glass optical fiber, the second optical filter, for by the optical attenuator of optical power adjustment to 0dBm and photodetector；Described modulation
The power of microwave signal is 15dBm；
The output end of described laser instrument is connected with the input of described bipolar electrode Mach-increasing Dare modulator；Described
Power splitter there is two output ends, the respectively first output end and the second output end, the first output end of described power splitter
Be connected with an electrode of described bipolar electrode Mach-increasing Dare modulator, described the second output end of power splitter with described
The input of phase shifter connect, the described output end of phase shifter is another with described bipolar electrode Mach-increasing Dare modulator
One electrode connects；The output end of described bipolar electrode Mach-increasing Dare modulator is defeated with described erbium-doped fiber amplifier
Enter end to connect, the described output end of erbium-doped fiber amplifier is connected with the input of the first described optical filter, described
The output end of the first optical filter is connected with the input of described chalcogenide glass fiber, the output of described chalcogenide glass fiber
End is connected with the input of the second described optical filter, the described output end of the second optical filter and described optical attenuator
Input connect, the described output end of optical attenuator is connected with the input of described photodetector.
The passband of the second described optical filter is adjustable.
The modulated microwave signal frequency of described bipolar electrode Mach-increasing Dare modulator is continuous in the range of 9.5-11GHz
Adjustable.
Described laser instrument is distributed feedback laser, and described optical attenuator is adjustable optical attenuator.
Compared with prior art, the advantage of the millimeter wave generation system of the present invention is that producing luminous power by laser instrument is
The continuous optical carrier of 0dBm is input to the input of bipolar electrode Mach-increasing Dare modulator, and power is 15dBm by power splitter
Modulated microwave signal be divided into two way microwave signals, a road microwave signal is input to the one of bipolar electrode Mach-increasing Dare modulator
Individual electrode, another road microwave signal is input to and is input to bipolar electrode Mach-increasing Dare modulator after phase shifter is shifted by 180 degree
Another electrode, bipolar electrode Mach-increasing Dare modulator carries to its interior continuous optical carrier of input and microwave signal
Ripple exports the light wave of two sidebands after suppressing double sideband modulation, the light wave of two sidebands first passes through erbium-doped fiber amplifier to be carried out
Enhanced processing, injects chalcogenide glass light then filter the out-of-band noise of erbium-doped fiber amplifier generation by the first optical filter after
In fine, the light wave of two after amplification sideband occurs four-wave mixing effect to produce the output of pectination light wave in chalcogenide glass fiber, the
Useless optical frequency component in pectination light wave is filtered by two optical filters, is input to optical attenuation after two optical frequency components obtaining needs
In device, the optical power adjustment of the two optical frequency components needing is input to after beat frequency in photodetector to after 0dBm by optical attenuator
Output high frequency millimeter ripple；Thus realize the up conversion of frequency using external modulation technology with reference to four-wave mixing effect, produce six times
The millimeter-wave signal of frequency even more high frequency multiplication, finally realizes high order frequency and produces millimeter-wave signal, substantially reduces modulated microwave letter
The frequency in number source, overcomes and produces the microwave-driven signal frequency of millimeter wave in optical fiber radio communication technology and modulator bandwidth is asked
Topic, reduces system device bandwidth requirement, reduces system cost；
When the second optical filter passband can timing, the frequency interval of two optical frequency components if necessary is modulated microwave
6 times of signal frequency, then can achieve after photodetector beat frequency that 6 frequencys multiplication produce high frequency millimeter ripple；Two light if necessary
The frequency interval of frequency component is 8 times of modulated microwave signal frequency, then can achieve after photodetector beat frequency that 8 frequencys multiplication produce height
Frequency millimeter wave；The frequency interval of two optical frequency components if necessary is 10 times of modulated microwave signal frequency, then photodetection
Can achieve after device beat frequency that 10 frequencys multiplication produce high frequency millimeter ripple, by that analogy, can be come by the passband adjustment of the second optical filter
This photoproduction millimeter wave is selected to generate the frequency multiplication number of times of system.
The two of the technical problem to be solved be provide a kind of based on chalcogenide glass fiber four-wave mixing effect
Millimeter wave generation method, this millimeter wave generates system and adopts external modulation technology to combine chalcogenide glass fiber four-wave mixing effect in fact
The up conversion of existing frequency, produces the millimeter-wave signal of six frequency multiplication even more high frequencys multiplication, substantially reduces the frequency in modulated microwave signal source
Rate, overcomes microwave-driven signal frequency and the modulator bandwidth problem producing millimeter wave in optical fiber radio communication technology, reduces device
Part bandwidth requirement, reduces system cost.
The present invention solve above-mentioned technical problem two technical schemes being adopted be：One kind is based on chalcogenide glass fiber four ripple
The millimeter wave generation method of mixing effect, comprises the following steps：
1. adopt laser instrument to produce the continuous optical carrier that luminous power is 0dBm, this continuous optical carrier is input to
The input of bipolar electrode Mach-increasing Dare modulator；
2. by power, the modulated microwave signal for 15dBm is divided into two way microwave signals by power splitter, by a road microwave letter
Number it is input to an electrode of bipolar electrode Mach-increasing Dare modulator, another road microwave signal is input in phase shifter, phase shift
Device will be input to another electrode of bipolar electrode Mach-increasing Dare modulator after the microwave signal phase shift 180 degree of another road；
3. adjust the bias of bipolar electrode Mach-increasing Dare modulator, realize Double Sideband Suppressed Carrier modulation, bipolar electrode horse
The light wave of two sidebands is exported, the difference on the frequency of the light wave of two sidebands is modulated microwave signal after conspicuous-increasing Dare modulators modulate
2 times of frequency；
4. the light wave of two sidebands being amplified process makes its luminous power be amplified to 25dBm, is then filtered processing
After be input in chalcogenide glass fiber, the light wave of two sidebands occurs four-wave mixing effect to produce pectination in chalcogenide glass fiber
Light wave exports, and the frequency interval between the adjacent optical frequency composition of this pectination light wave is 2 times of modulated microwave signal frequency；
5. the useless optical frequency component in pectination light wave is filtered, obtain two optical frequency components of needs；
6. the optical power adjustment of the two optical frequency components needing is input to after 0dBm by photodetection using optical attenuator
Beat frequency in device, exports high frequency millimeter ripple, and the frequency of this millimeter wave is equal to be input to two optical frequency components of photodetector
Difference on the frequency.
Described laser instrument is distributed feedback laser, and described optical attenuator is adjustable optical attenuator.
Described step 4. in using erbium-doped fiber amplifier be amplified process, be filtered using the first optical filter
Process, described step 5. in using the second optical filter, the useless optical frequency component in pectination light wave is filtered.
The passband of the second described optical filter is adjustable.
The modulated microwave signal frequency of described bipolar electrode Mach-increasing Dare modulator is continuous in the range of 9.5-11GHz
Adjustable.
Compared with prior art, the advantage of the millimeter wave generation method of the present invention is that first passing through laser instrument produces light work(
Rate is that the continuous optical carrier of 0dBm is input to the input of bipolar electrode Mach-increasing Dare modulator, using power splitter by work(
Rate is that the modulated microwave signal of 15dBm is divided into two way microwave signals, and a road microwave signal is input to bipolar electrode Mach-increasing Dare and adjusts
One electrode of device processed, another road microwave signal is input to after phase shifter is shifted by 180 degree and is input to bipolar electrode Mach-increasing Dare
Another electrode of modulator, bipolar electrode Mach-increasing Dare modulator is to its interior continuous optical carrier of input and microwave letter
The light wave of two sidebands is exported, the light wave of two sidebands is amplified process makes its light after number carrying out Double Sideband Suppressed Carrier modulation
Power amplification, to 25dBm, is input in chalcogenide glass fiber after being then filtered processing, the light wave of two sidebands is in sulphur system glass
Four-wave mixing effect is occurred to produce the output of pectination light wave in glass optical fiber, the useless optical frequency component in pectination light wave obtains after being filtered out
The two optical frequency components needing are input in optical attenuator, and the optical power adjustment of the two optical frequency components needing is arrived by optical attenuator
High frequency millimeter ripple is exported after being input to beat frequency in photodetector after 0dBm；Thus four-wave mixing is combined using external modulation technology
Effect realizes the up conversion of frequency, produces the millimeter-wave signal of six frequency multiplication even more high frequencys multiplication, finally realizes high order frequency and produces
Millimeter-wave signal, substantially reduces the frequency in modulated microwave signal source, overcomes and produces the micro- of millimeter wave in optical fiber radio communication technology
Ripple driving signal frequency and modulator bandwidth problem, reduce system device bandwidth requirement, reduce millimeter wave generation method cost；
When the second optical filter passband can timing, the frequency interval of two optical frequency components if necessary is modulated microwave
6 times of signal frequency, then can achieve after photodetector beat frequency that 6 frequencys multiplication produce high frequency millimeter ripple；Two light if necessary
The frequency interval of frequency component is 8 times of modulated microwave signal frequency, then can achieve after photodetector beat frequency that 8 frequencys multiplication produce height
Frequency millimeter wave；The frequency interval of two optical frequency components if necessary is 10 times of modulated microwave signal frequency, then photodetection
Can achieve after device beat frequency that 10 frequencys multiplication produce high frequency millimeter ripple, by that analogy, can be come by the passband adjustment of the second optical filter
Select the frequency multiplication number of times of this photoproduction millimeter wave generation method.
Brief description
Fig. 1 is the theory diagram of the millimeter wave generation system of the present invention；
Fig. 2 is each step frequency of light wave schematic diagram of the present invention；
Fig. 3 is the spectrogram of the pectination light wave of the present invention；
Fig. 4 is the filtering schematic diagram of second wave filter of the present invention；
Fig. 5 is the spectrogram of the input input of the photodetector of the present invention；
Fig. 6 is the spectrogram of the 60GHz millimeter-wave signal of output end output of the photodetector of the present invention.
Specific embodiment
Generate system below in conjunction with accompanying drawing embodiment to the millimeter wave of the present invention to be described in further detail.
Embodiment：As shown in figure 1, a kind of millimeter wave based on chalcogenide glass fiber four-wave mixing effect generates system, bag
Include for produce the continuous optical carrier that luminous power is 0dBm laser instrument 1, for modulated microwave signal is divided into two-way micro-
The power splitter 2 of ripple signal, for by the phase shifter 3 of microwave signal phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator (MZM)
4th, be used for by luminous power be amplified to erbium-doped fiber amplifier (EDFA) 5, first optical filter 6 of 25dBm, chalcogenide glass fiber 7,
Second optical filter 8, for by the optical attenuator 9 of optical power adjustment to 0dBm and photodetector (PD) 10；Modulated microwave is believed
Number power be 15dBm；
The output end of laser instrument 1 is connected with the input of bipolar electrode Mach-increasing Dare modulator 4；Power splitter 2 has two
Output end, the respectively first output end and the second output end, the first output end of power splitter 2 is adjusted with bipolar electrode Mach-increasing Dare
One electrode of device 4 processed connects, and the second output end of power splitter 2 is connected with the input of phase shifter 3, the output end of phase shifter 3
It is connected with another electrode of bipolar electrode Mach-increasing Dare modulator 4；The output end of bipolar electrode Mach-increasing Dare modulator 4 with
The input of erbium-doped fiber amplifier 5 connects, and the output end of erbium-doped fiber amplifier 5 is connected with the input of the first optical filter 6
Connect, the output end of the first optical filter 6 is connected with the input of chalcogenide glass fiber 7, the output end of chalcogenide glass fiber 7 and the
The input of two optical filters 8 connects, and the output end of the second optical filter 8 is connected with the input of optical attenuator 9, optical attenuator
9 output end is connected with the input of photodetector 10.
In the present embodiment, laser instrument 1 is distributed feedback laser, and optical attenuator 9 is adjustable optical attenuator.
In the present embodiment, the passband of the second optical filter 8 is adjustable；The modulated microwave of bipolar electrode Mach-increasing Dare modulator 4
Signal frequency continuously adjustabe in the range of 9.5-11GHz.
The course of work that the millimeter wave of the present embodiment generates system is as described below：Laser instrument 1, power splitter 2, phase shifter 3 and
Bipolar electrode Mach-increasing Dare modulator 4 combines realizes Double Sideband Suppressed Carrier modulation function, erbium-doped fiber amplifier (EDFA) 5,
First optical filter 6 and chalcogenide glass fiber 7 combination sight line four-wave mixing function, the second optical filter 8, optical attenuator 9 and light
Millimeter wave systematic function is realized in electric explorer (PD) 10 combination；Laser instrument 1 produces the continuous optical carrier that luminous power is 0dBm
It is input to the input of bipolar electrode Mach-increasing Dare modulator 4, the modulated microwave signal for 15dBm is divided into power splitter 2 by power
Two way microwave signals, a road microwave signal is input to an electrode of bipolar electrode Mach-increasing Dare modulator 4, another road microwave
Signal input is shifted by being input to another electrode of bipolar electrode Mach-increasing Dare modulator 4, double electricity after 180 degree to phase shifter 3
Pole Mach-increasing Dare modulator 4 carries out Double Sideband Suppressed Carrier tune to its interior continuous optical carrier of input and microwave signal
The light wave of two sidebands is exported, the light wave of two sidebands first passes through erbium-doped fiber amplifier 5 and is amplified processing, then after system
Filtered in injection chalcogenide glass fiber 7 after the out-of-band noise of erbium-doped fiber amplifier 5 generation by the first optical filter 6, amplify
The light wave of two sidebands afterwards occurs four-wave mixing effect to produce the output of pectination light wave, this pectination light wave in chalcogenide glass fiber 7
Spectrogram as shown in Figure 3；Useless optical frequency component in pectination light wave is filtered by the second optical filter 8, obtains two of needs
It is input to after optical frequency component in optical attenuator 9, optical attenuator 9 is by the optical power adjustment of the two optical frequency components needing to after 0dBm
High frequency millimeter ripple is exported after being input to beat frequency in photodetector 10.
In the present embodiment, can adjust, by adjusting the passband of the second optical filter 8, times frequency that millimeter wave generates system
Number.The frequency interval of two optical frequency components if necessary is 6 times of modulated microwave signal frequency, then after photodetector beat frequency
Can achieve that 6 frequencys multiplication produce high frequency millimeter ripple；The frequency interval of two optical frequency components if necessary is modulated microwave signal frequency
8 times of rate, then can achieve after photodetector beat frequency that 8 frequencys multiplication produce high frequency millimeter ripple；Two optical frequency components if necessary
Frequency interval be 10 times of modulated microwave signal frequency, then can achieve after photodetector beat frequency that 10 frequencys multiplication produce high frequencies milli
Metric wave, by that analogy, can select this photoproduction millimeter wave to generate the frequency multiplication number of times of system by the second optical filter 8.Work as needs
The frequency interval of two optical frequency components when being 6 times of modulated microwave signal frequency, the output end output of photodetector 10
60GHz millimeter-wave signal, this photoproduction millimeter wave generates system each step frequency of light wave schematic diagram as shown in Fig. 2 f in Fig. 2oFor even
The frequency of continuous optical carrier, f is the frequency of modulated microwave signal；The filtering schematic diagram of the second wave filter is as shown in Figure 4；Photoelectricity
The spectrogram of the input input of detector is as shown in Figure 5；The 60GHz millimeter-wave signal of the output end output of photodetector 10
Spectrogram as shown in Figure 6.
In the present embodiment, the modulated microwave signal frequency of bipolar electrode Mach-increasing Dare modulator (MZM) 4 is in 9.5-11GHz
In the range of continuously adjustabe, the frequency interval of two optical frequency components if necessary is 6 times of modulated microwave signal frequency, then photoelectricity
Continuously adjustable millimeter-wave signal in 57-66GHz frequency range can be obtained after detector beat frequency, the unlicensed of 59-64GHz can be covered
According to millimere-wave band.
Present invention also offers a kind of millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect, below tie
Close accompanying drawing embodiment the photoproduction millimeter wave generation method of the present invention is described in further detail.
Embodiment：A kind of millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect is it is characterised in that wrap
Include following steps：
1. adopt laser instrument to produce the continuous optical carrier that luminous power is 0dBm, this continuous optical carrier is input to
The input of bipolar electrode Mach-increasing Dare modulator；
2. by power, the modulated microwave signal for 15dBm is divided into two way microwave signals by power splitter, by a road microwave letter
Number it is input to an electrode of bipolar electrode Mach-increasing Dare modulator, another road microwave signal is input in phase shifter, phase shift
Device will be input to another electrode of bipolar electrode Mach-increasing Dare modulator after the microwave signal phase shift 180 degree of another road；
3. adjust the bias of bipolar electrode Mach-increasing Dare modulator, realize Double Sideband Suppressed Carrier modulation, bipolar electrode horse
The light wave of two sidebands is exported, the difference on the frequency of the light wave of two sidebands is modulated microwave signal after conspicuous-increasing Dare modulators modulate
2 times of frequency；
4. the light wave of two sidebands being amplified process makes its luminous power be amplified to 25dBm, is then filtered processing
After be input in chalcogenide glass fiber, the light wave of two sidebands occurs four-wave mixing effect to produce pectination in chalcogenide glass fiber
Light wave exports, and the frequency interval between the adjacent optical frequency composition of this pectination light wave is 2 times of modulated microwave signal frequency；
5. the useless optical frequency component in pectination light wave is filtered, obtain two optical frequency components of needs；
6. the optical power adjustment of the two optical frequency components needing is input to after 0dBm by photodetection using optical attenuator
Beat frequency in device, exports millimeter wave, and the frequency of this millimeter wave is equal to be input to the frequency of two optical frequency components of photodetector
Difference.
In the present embodiment, laser instrument is distributed feedback laser, and optical attenuator is adjustable optical attenuator.
In the present embodiment, step 4. in using erbium-doped fiber amplifier be amplified process, entered using the first optical filter
Row filtering process, step 5. in using the second optical filter, the useless optical frequency component in pectination light wave is filtered.Second light filtering
The passband of device 8 is adjustable；The modulated microwave signal frequency of bipolar electrode Mach-increasing Dare modulator 4 is continuous in the range of 9.5-11GHz
Adjustable.
In the present embodiment, can adjust, by adjusting the passband of the second optical filter 8, times frequency that millimeter wave generates system
Number.The frequency interval of two optical frequency components if necessary is 6 times of modulated microwave signal frequency, then after photodetector beat frequency
Can achieve that 6 frequencys multiplication produce high frequency millimeter ripple；The frequency interval of two optical frequency components if necessary is modulated microwave signal frequency
8 times of rate, then can achieve after photodetector beat frequency that 8 frequencys multiplication produce high frequency millimeter ripple；Two optical frequency components if necessary
Frequency interval be 10 times of modulated microwave signal frequency, then can achieve after photodetector beat frequency that 10 frequencys multiplication produce high frequencies milli
Metric wave, by that analogy, can select this photoproduction millimeter wave to generate the frequency multiplication number of times of system by the second optical filter.When need
When the frequency interval of two optical frequency components is 6 times of modulated microwave signal frequency, the output end output of photodetector 10
60GHz millimeter-wave signal, this photoproduction millimeter wave generation method each step frequency of light wave schematic diagram is as shown in Fig. 2 f in Fig. 2oFor even
The frequency of continuous optical carrier, f is the frequency of modulated microwave signal；The filtering schematic diagram of the second wave filter is as shown in figure 4, wherein
ωcFor the frequency of continuous optical carrier, ωRFFor the frequency of modulated microwave signal, 3 ωRFRepresent ωRF3 times, 5 ωRFRepresent
ωRF5 times, 6 ωRFRepresent ωRF6 times；The spectrogram of the input input of photodetector is as shown in Figure 5；Photodetector
The spectrogram of the 10 60GHz millimeter-wave signal of output end output is as shown in Figure 6.
In the present embodiment, the modulated microwave signal frequency of bipolar electrode Mach-increasing Dare modulator (MZM) is in 9.5-11GHz
In the range of continuously adjustabe, the frequency interval of two optical frequency components if necessary is 6 times of modulated microwave signal frequency, then photoelectricity
Continuously adjustable millimeter-wave signal in 57-66GHz frequency range can be obtained after detector beat frequency, the unlicensed of 59-64GHz can be covered
According to millimere-wave band.
Claims (9)
1. a kind of millimeter wave based on chalcogenide glass fiber four-wave mixing effect generates system it is characterised in that including for producing
Luminous power is the laser instrument of continuous optical carrier of 0dBm, the work(for modulated microwave signal is divided into two way microwave signals divides
Device, for by the phase shifter of microwave signal phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator, be used for being amplified to luminous power
The erbium-doped fiber amplifier of 25dBm, the first optical filter, chalcogenide glass fiber, the second optical filter, for by optical power adjustment
Optical attenuator and photodetector to 0dBm；The power of described modulated microwave signal is 15dBm；
The output end of described laser instrument is connected with the input of described bipolar electrode Mach-increasing Dare modulator；Described work(
Utensil is divided to have two output ends, the respectively first output end and the second output end, described the first output end of power splitter and institute
One electrode connection, described the second output end of power splitter and the described shifting of the bipolar electrode Mach stated-increasing Dare modulator
The input of phase device connects, the described output end of phase shifter and described bipolar electrode Mach-increasing Dare modulator another
Electrode connects；The output end of described bipolar electrode Mach-increasing Dare modulator and the input of described erbium-doped fiber amplifier
Connect, the described output end of erbium-doped fiber amplifier is connected with the input of the first described optical filter, described first
The output end of optical filter is connected with the input of described chalcogenide glass fiber, the described output end of chalcogenide glass fiber with
The input of the second described optical filter connects, and the described output end of the second optical filter is defeated with described optical attenuator
Enter end to connect, the described output end of optical attenuator is connected with the input of described photodetector.
2. the millimeter wave based on chalcogenide glass fiber four-wave mixing effect according to claim 1 generates system, its feature
It is that the passband of the second described optical filter is adjustable.
3. the millimeter wave based on chalcogenide glass fiber four-wave mixing effect according to claim 2 generates system, its feature
The modulated microwave signal frequency of the bipolar electrode Mach-increasing Dare modulator described in being continuously adjustabe in the range of 9.5-11GHz.
4. the millimeter wave based on chalcogenide glass fiber four-wave mixing effect according to claim 1 generates system, its feature
It is that described laser instrument is distributed feedback laser, described optical attenuator is adjustable optical attenuator.
5. a kind of millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect is it is characterised in that include following walking
Suddenly：
1. adopt laser instrument to produce the continuous optical carrier that luminous power is 0dBm, this continuous optical carrier is input to double electricity
The input of pole Mach-increasing Dare modulator；
2. by power, the modulated microwave signal for 15dBm is divided into two way microwave signals by power splitter, will be defeated for a road microwave signal
Enter an electrode to bipolar electrode Mach-increasing Dare modulator, another road microwave signal is input in phase shifter, phase shifter will
It is input to another electrode of bipolar electrode Mach-increasing Dare modulator after the microwave signal phase shift 180 degree of another road；
3. adjust the bias of bipolar electrode Mach-increasing Dare modulator, realize Double Sideband Suppressed Carrier modulation, bipolar electrode Mach-increasing
The light wave of two sidebands is exported, the difference on the frequency of the light wave of two sidebands is modulated microwave signal frequency after Dare modulators modulate
2 times；
4. the light wave of two sidebands being amplified process makes its luminous power be amplified to 25dBm, defeated after being then filtered processing
Enter in chalcogenide glass fiber, the light wave of two sidebands occurs four-wave mixing effect to produce pectination light wave in chalcogenide glass fiber
Output, the frequency interval between the adjacent optical frequency composition of this pectination light wave is 2 times of modulated microwave signal frequency；
5. the useless optical frequency component in pectination light wave is filtered, obtain two optical frequency components of needs；
6. using optical attenuator, the optical power adjustment of the two optical frequency components needing is input in photodetector to after 0dBm
Beat frequency, exports millimeter wave, and the frequency of this millimeter wave is equal to be input to the difference on the frequency of two optical frequency components of photodetector.
6. the millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect according to claim 5, its feature
It is that described laser instrument is distributed feedback laser, described optical attenuator is adjustable optical attenuator.
7. the millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect according to claim 5, its feature
It is amplified processing using erbium-doped fiber amplifier in being described step 4., be filtered locating using the first optical filter
Reason, described step 5. in using the second optical filter, the useless optical frequency component in pectination light wave is filtered.
8. the millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect according to claim 7, its feature
It is that the passband of the second described optical filter is adjustable.
9. the millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect according to claim 5, its feature
The modulated microwave signal frequency of the bipolar electrode Mach-increasing Dare modulator described in being continuously adjustabe in the range of 9.5-11GHz.
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| CN109361469B (en) * | 2018-08-27 | 2021-08-20 | 宁波财经学院 | Millimeter wave generation system and method based on quantum dot laser |
| CN111596278A (en) * | 2019-12-24 | 2020-08-28 | 北京理工大学 | Multi-band coherent frequency-sweeping radar system based on dual-drive Mach-Zehnder modulator |
| CN111835424A (en) * | 2020-06-27 | 2020-10-27 | 光创新电(苏州)信息科技有限公司 | Millimeter wave generating system for generating six-time frequency vector and using method thereof |
| CN113067643B (en) * | 2021-03-22 | 2022-09-30 | 中国电子科技集团公司第十四研究所 | MZM bias point control method of EDFA-containing optical link |
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| CN101982983A (en) * | 2010-10-18 | 2011-03-02 | 电子科技大学 | Method for generating millimetre waves by utilizing semiconductor optical amplifier (SOA) and method and device for applying millimetre waves in radio over fiber (ROF) communication system |
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