CN104601240A - 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 millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect and method.
Background technology
Optical fiber communication has the characteristic of low-loss, high bandwidth, and optical fiber radio (ROF) technology answers high-speed high capacity wireless communication needs, emerging wireless access technology optical fiber communication and radio communication are combined together grown up.The Radio Access Network with ultra-wide band of optical fiber radio (ROF) System's composition realizes being connected at a distance between central processing station with base station by optical fiber, is realized the wireless coverage of tens meters of scopes by microwave, millimeter-wave systems.At present, the millimere-wave band of 59-64GHz has been assigned exclusively to the ROF technology application of unlicensed by many countries, has greatly promoted the development of millimere-wave band ROF technology.It is one of key technology realizing millimere-wave band ROF system that high-quality millimeter-wave signal generates.But make narrow linewidth, low phase noise, high stability and tunable millimetre-wave signal time, high to the requirement of technique, millimeter wave generates more difficult under electrical domain, faces the electronic bottleneck that cannot break through.In addition, the commercial electrooptic modulator of the maturation of directly modulation millimeter-wave signal is extremely rare and expensive.Therefore study how to utilize optical means to produce the carrier signal of millimere-wave band be hot issue in millimere-wave band RoF research field always.Millimeter wave is produced by the method for optics, the consideration for cost on the one hand, on the other hand, millimeter wave processes more difficult under electrical domain, faces the electronic bottleneck that cannot break through, and with optics produce millimeter wave, not only there is the advantage that phase noise is low, and due to the loss of optical fiber very little, signal can long-distance transmissions, is convenient to be assigned to far-end by antenna transmission.
At present, the technology of optics generation millimeter wave mainly contains light heterodyne technology, external modulation technology and optical frequency-doubling technology etc.The general principle of light heterodyne technology is the light carrier utilizing two difference on the frequencies to equal required millimeter wave frequency, in photodetector, beat frequency generates millimeter wave, the method needs the phase place of two light carriers highly stable and relevant, need extra PGC demodulation module when realizing, be difficult to the high-quality millimeter wave obtaining low phase noise.External modulation technology, based on the nonlinear response of external modulator, produces sideband frequency, obtains millimeter-wave signal, comprise double-sideband modulation, single-side band modulation and carrier suppressed modulation etc. at receiving terminal by sideband beat frequency.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 high-frequency microwave signal source realizes difficulty greatly, and system cost is too high.Comparatively speaking, optical frequency-doubling technology has more advantage.Lower frequency microwave signals is modulated on light wave by various external modulation device and some other optical processing devices by optical frequency-doubling technology, and produces high order harmonic component optical sideband, produces targeted high frequency millimeter-wave signal finally by photodetector beat frequency.In this kind of scheme, the characteristics such as the live width of the millimeter-wave signal that frequency multiplication produces and phase noise all remain on identical magnitude with modulated microwave signal, and have nothing to do with optics used, overcome the restriction of electronics frequency doubling device response frequency and bandwidth, and phase noise is low.Meanwhile, the optics such as the intensity modulator needed in scheme, phase-modulator and semiconductor optical amplifier are ripe commercialized device common on the market, and therefore scheme realizes simple and stability is high, more common in millimeter wave ROF system.
The millimeter wave generation system typical scenario of existing Application Optics frequency doubling technology comprises: utilize Mach-increasing Dare modulator and filters in series to produce quadruple millimeter-wave signal; Two MZM cascades are utilized to produce quadruple millimeter-wave signal; Two phase-modulator parallel connections are utilized to produce six frequency doubling millimetre wave signals etc.But the frequency that these millimeter wave generation systems realize is still lower, still needs the modulated microwave signal source of upper frequency, and needs multiple modulator, system cost is difficult to reduce, and greatly limit the application of this technology.
Summary of the invention
One of technical problem to be solved by this invention is to provide a kind of millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect, this millimeter wave generation system adopts external modulation combine with technique chalcogenide glass fiber four-wave mixing effect to realize the up conversion of frequency, produce the millimeter-wave signal of the even higher frequency multiplication of six frequencys multiplication, greatly reduce the frequency in modulated microwave signal source, overcome the microwave-driven signal frequency and modulator bandwidth problem that produce millimeter wave in optical fiber radio communication technology, reduce system device bandwidth requirement, reduce system cost.
The present invention one of to solve the problems of the technologies described above the technical scheme adopted: a kind of millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect, comprise for generation of luminous power the laser of the continuous light carrier signal being 0dBm, for modulated microwave signal being divided into the power splitter of two way microwave signals, for the phase shifter by microwave signal phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator, for luminous power being amplified to the erbium-doped fiber amplifier of 25dBm, first optical filter, chalcogenide glass fiber, second optical filter, for by optical power adjustment to the optical attenuator of 0dBm and photodetector, the power of described modulated microwave signal is 15dBm,
The output of described laser is connected with the input of described bipolar electrode Mach-increasing Dare modulator, described power splitter has two outputs, be respectively the first output and the second output, an Electrode connection of the first output of described power splitter and described bipolar electrode Mach-increasing Dare modulator, second output of described power splitter is connected with the input of described phase shifter, another Electrode connection of the output of described phase shifter and described bipolar electrode Mach-increasing Dare modulator, the output of described bipolar electrode Mach-increasing Dare modulator is connected with the input of described erbium-doped fiber amplifier, the output of described erbium-doped fiber amplifier is connected with the input of the first described optical filter, the output of the first described optical filter is connected with the input of described chalcogenide glass fiber, the output of described chalcogenide glass fiber is connected with the input of the second described optical filter, the output of the second described optical filter is connected with the input of described optical attenuator, the output of described optical attenuator is connected with the input of described photodetector.
The passband of the second described optical filter is adjustable.
Modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of described bipolar electrode Mach-increasing Dare modulator.
Described laser is distributed feedback laser, and described optical attenuator is adjustable optical attenuator.
Compared with prior art, the continuous light carrier signal that it is 0dBm that the advantage of millimeter wave generation system of the present invention is by laser generation luminous power is input to the input of bipolar electrode Mach-increasing Dare modulator, power is that the modulated microwave signal of 15dBm is divided into two way microwave signals by power splitter, one tunnel microwave signal is input to an electrode of bipolar electrode Mach-increasing Dare modulator, another road microwave signal is input to phase shifter and is input to another electrode of bipolar electrode Mach-increasing Dare modulator after phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator exports the light wave of two sidebands after carrying out Double Sideband Suppressed Carrier modulation to the continuous light carrier signal inputted in it and microwave signal, first the light wave of two sidebands carries out amplification process by erbium-doped fiber amplifier, then by injecting in chalcogenide glass fiber after the out-of-band noise of the first optical filter filtering erbium-doped fiber amplifier generation, the light wave of two sidebands after amplification produces pectination light wave at chalcogenide glass fiber generation four-wave mixing effect and exports, second optical filter is by the useless optical frequency component filtering in pectination light wave, be input in optical attenuator after obtaining two the optical frequency components needed, the optical power adjustment of two the optical frequency components needed is input in photodetector and exports high frequency millimeter ripple after beat frequency by optical attenuator after 0dBm, external modulation combine with technique four-wave mixing effect is adopted to realize the up conversion of frequency thus, produce the millimeter-wave signal of the even higher frequency multiplication of six frequencys multiplication, finally realize high order frequency and produce millimeter-wave signal, greatly reduce the frequency in modulated microwave signal source, overcome the microwave-driven signal frequency and modulator bandwidth problem that produce millimeter wave in optical fiber radio communication technology, reduce system device bandwidth requirement, reduce system cost,
When the passband of the second optical filter can timing, if the frequency interval of two the optical frequency components needed is 6 times of modulated microwave signal frequency, then can realizes 6 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripples; If the frequency interval of two the optical frequency components needed is 8 times of modulated microwave signal frequency, then can realizes 8 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple; If the frequency interval of two the optical frequency components needed is 10 times of modulated microwave signal frequency, then can realize 10 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple, by that analogy, the frequency multiplication number of times of this photoproduction millimeter wave generation system is selected in the passband adjustment by the second optical filter.
Two of technical problem to be solved by this invention is to provide a kind of millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect, this millimeter wave generation system adopts external modulation combine with technique chalcogenide glass fiber four-wave mixing effect to realize the up conversion of frequency, produce the millimeter-wave signal of the even higher frequency multiplication of six frequencys multiplication, greatly reduce the frequency in modulated microwave signal source, overcome the microwave-driven signal frequency and modulator bandwidth problem that produce millimeter wave in optical fiber radio communication technology, reduce device bandwidth requirement, reduce system cost.
Two technical schemes adopted that the present invention solves the problems of the technologies described above are: a kind of millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect, comprises the following steps:
1. adopt laser to produce the continuous light carrier signal that luminous power is 0dBm, this continuous light carrier signal is input to the input of bipolar electrode Mach-increasing Dare modulator;
2. be that the modulated microwave signal of 15dBm is divided into two way microwave signals by power splitter by power, one tunnel microwave signal is input to an electrode of bipolar electrode Mach-increasing Dare modulator, be input in phase shifter by another road microwave signal, phase shifter will be input to another electrode of bipolar electrode Mach-increasing Dare modulator after another road microwave signal phase shift 180 degree;
3. regulate the bias voltage of bipolar electrode Mach-increasing Dare modulator, realize Double Sideband Suppressed Carrier modulation, export the light wave of two sidebands after bipolar electrode Mach-increasing Dare modulators modulate, the difference on the frequency of the light wave of two sidebands is 2 times of modulated microwave signal frequency;
4. the light wave of two sidebands being carried out amplification process makes its luminous power be amplified to 25dBm, then be input to after carrying out filtering process in chalcogenide glass fiber, there is four-wave mixing effect and produce the output of pectination light wave in the light wave of two sidebands, the frequency interval between the adjacent optical frequency composition of this pectination light wave is 2 times of modulated microwave signal frequency in chalcogenide glass fiber;
5. by the useless optical frequency component filtering in pectination light wave, two the optical frequency components needed are obtained;
6. adopt optical attenuator that the optical power adjustment of two the optical frequency components needed is input to beat frequency in photodetector after 0dBm, export high frequency millimeter ripple, this millimeter of wave frequency just equals the difference on the frequency of two the optical frequency components being input to photodetector.
Described laser is distributed feedback laser, and described optical attenuator is adjustable optical attenuator.
Described step 4. in adopt erbium-doped fiber amplifier carry out amplifications process, adopt the first optical filter to carry out filtering process, described step 5. in employing the second optical filter by the useless optical frequency component filtering in pectination light wave.
The passband of the second described optical filter is adjustable.
Modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of described bipolar electrode Mach-increasing Dare modulator.
Compared with prior art, the advantage of millimeter wave generation method of the present invention is that the continuous light carrier signal being first 0dBm by laser generation luminous power is input to the input of bipolar electrode Mach-increasing Dare modulator, power is that the modulated microwave signal of 15dBm is divided into two way microwave signals by employing power splitter, one tunnel microwave signal is input to an electrode of bipolar electrode Mach-increasing Dare modulator, another road microwave signal is input to phase shifter and is input to another electrode of bipolar electrode Mach-increasing Dare modulator after phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator exports the light wave of two sidebands after carrying out Double Sideband Suppressed Carrier modulation to the continuous light carrier signal inputted in it and microwave signal, the light wave of two sidebands carries out amplification process makes its luminous power be amplified to 25dBm, then be input to after carrying out filtering process in chalcogenide glass fiber, four-wave mixing effect is there is and produces the output of pectination light wave in the light wave of two sidebands in chalcogenide glass fiber, useless optical frequency component in pectination light wave is input in optical attenuator by two the optical frequency components obtaining after filtering needing, the optical power adjustment of two the optical frequency components needed is input in photodetector and exports high frequency millimeter ripple after beat frequency by optical attenuator after 0dBm, external modulation combine with technique four-wave mixing effect is adopted to realize the up conversion of frequency thus, produce the millimeter-wave signal of the even higher frequency multiplication of six frequencys multiplication, finally realize high order frequency and produce millimeter-wave signal, greatly reduce the frequency in modulated microwave signal source, overcome the microwave-driven signal frequency and modulator bandwidth problem that produce millimeter wave in optical fiber radio communication technology, reduce system device bandwidth requirement, reduce millimeter wave generation method cost,
When the passband of the second optical filter can timing, if the frequency interval of two the optical frequency components needed is 6 times of modulated microwave signal frequency, then can realizes 6 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripples; If the frequency interval of two the optical frequency components needed is 8 times of modulated microwave signal frequency, then can realizes 8 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple; If the frequency interval of two the optical frequency components needed is 10 times of modulated microwave signal frequency, then can realize 10 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple, by that analogy, the frequency multiplication number of times of this photoproduction millimeter wave generation method is selected in the passband adjustment by the second optical filter.
Accompanying drawing explanation
Fig. 1 is the theory diagram of 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 pectination light wave of the present invention;
Fig. 4 is the filtering schematic diagram of the second filter of the present invention;
Fig. 5 is the spectrogram of the input input of photodetector of the present invention;
Fig. 6 is the spectrogram of the 60GHz millimeter-wave signal that the output of photodetector of the present invention exports.
Embodiment
Below in conjunction with accompanying drawing embodiment, millimeter wave generation system of the present invention is described in further detail.
Embodiment: as shown in Figure 1, a kind of millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect, comprise for generation of luminous power the laser 1 of the continuous light carrier signal being 0dBm, for modulated microwave signal being divided into the power splitter 2 of two way microwave signals, for the phase shifter 3 by microwave signal phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator (MZM) 4, for luminous power being amplified to the erbium-doped fiber amplifier (EDFA) 5 of 25dBm, first optical filter 6, chalcogenide glass fiber 7, second optical filter 8, for by optical power adjustment to the optical attenuator 9 of 0dBm and photodetector (PD) 10, the power of modulated microwave signal is 15dBm,
The output of laser 1 is connected with the input of bipolar electrode Mach-increasing Dare modulator 4; Power splitter 2 has two outputs, be respectively the first output and the second output, an Electrode connection of the first output of power splitter 2 and bipolar electrode Mach-increasing Dare modulator 4, second output of power splitter 2 is connected with the input of phase shifter 3, another Electrode connection of the output of phase shifter 3 and bipolar electrode Mach-increasing Dare modulator 4; The output of bipolar electrode Mach-increasing Dare modulator 4 is connected with the input of erbium-doped fiber amplifier 5, the output of erbium-doped fiber amplifier 5 is connected with the input of the first optical filter 6, the output of the first optical filter 6 is connected with the input of chalcogenide glass fiber 7, the output of chalcogenide glass fiber 7 is connected with the input of the second optical filter 8, the output of the second optical filter 8 is connected with the input of optical attenuator 9, and the output of optical attenuator 9 is connected with the input of photodetector 10.
In the present embodiment, laser 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; Modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of bipolar electrode Mach-increasing Dare modulator 4.
The course of work of the millimeter wave generation system of the present embodiment is as described below: laser 1, power splitter 2, phase shifter 3 and bipolar electrode Mach-increasing Dare modulator 4 combination realizes Double Sideband Suppressed Carrier modulation function, erbium-doped fiber amplifier (EDFA) 5, first optical filter 6 and chalcogenide glass fiber 7 combine sight line four wave mixing function, and the combination of the second optical filter 8, optical attenuator 9 and photodetector (PD) 10 realizes millimeter wave systematic function; it is the input that the continuous light carrier signal of 0dBm is input to bipolar electrode Mach-increasing Dare modulator 4 that laser 1 produces luminous power, power is that the modulated microwave signal of 15dBm is divided into two way microwave signals by power splitter 2, one tunnel microwave signal is input to an electrode of bipolar electrode Mach-increasing Dare modulator 4, another road microwave signal is input to phase shifter 3 and is input to another electrode of bipolar electrode Mach-increasing Dare modulator 4 after phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator 4 exports the light wave of two sidebands after carrying out Double Sideband Suppressed Carrier modulation to the continuous light carrier signal inputted in it and microwave signal, first the light wave of two sidebands carries out amplification process by erbium-doped fiber amplifier 5, then by injecting in chalcogenide glass fiber 7 after the out-of-band noise of the first optical filter 6 filtering erbium-doped fiber amplifier 5 generation, four-wave mixing effect is there is and produces the output of pectination light wave in the light wave of two sidebands after amplification at chalcogenide glass fiber 7, the spectrogram of this pectination light wave as shown in Figure 3, second optical filter 8 is by the useless optical frequency component filtering in pectination light wave, be input in optical attenuator 9 after obtaining two the optical frequency components needed, the optical power adjustment of two the optical frequency components needed is input in photodetector 10 and exports high frequency millimeter ripple after beat frequency by optical attenuator 9 after 0dBm.
In the present embodiment, by adjusting the passband of the second optical filter 8 to adjust the frequency multiplication number of times of millimeter wave generation system.If the frequency interval of two the optical frequency components needed is 6 times of modulated microwave signal frequency, then can realizes 6 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple; If the frequency interval of two the optical frequency components needed is 8 times of modulated microwave signal frequency, then can realizes 8 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple; If the frequency interval of two the optical frequency components needed is 10 times of modulated microwave signal frequency, then can realize 10 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple, by that analogy, the frequency multiplication number of times of this photoproduction millimeter wave generation system is selected by the second optical filter 8.When the frequency interval of two optical frequency components needed is 6 times of modulated microwave signal frequency, the 60GHz millimeter-wave signal that the output of photodetector 10 exports, this photoproduction millimeter wave generation system each step frequency of light wave schematic diagram as shown in Figure 2, f in Fig. 2
ofor the frequency of continuous light carrier signal, f is the frequency of modulated microwave signal; The filtering schematic diagram of the second filter as shown in Figure 4; The spectrogram of the input input of photodetector as shown in Figure 5; The spectrogram of the 60GHz millimeter-wave signal of the output output of photodetector 10 as shown in Figure 6.
In the present embodiment, modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of bipolar electrode Mach-increasing Dare modulator (MZM) 4, if the frequency interval of two the optical frequency components needed is 6 times of modulated microwave signal frequency, then can obtain continuously adjustable millimeter-wave signal in 57-66GHz frequency range after photodetector beat frequency, the millimere-wave band of the unlicensed of 59-64GHz can be covered.
Present invention also offers a kind of millimeter wave generation method based on chalcogenide glass fiber four-wave mixing effect, below in conjunction with accompanying drawing embodiment, 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 characterized in that comprising the following steps:
1. adopt laser to produce the continuous light carrier signal that luminous power is 0dBm, this continuous light carrier signal is input to the input of bipolar electrode Mach-increasing Dare modulator;
2. be that the modulated microwave signal of 15dBm is divided into two way microwave signals by power splitter by power, one tunnel microwave signal is input to an electrode of bipolar electrode Mach-increasing Dare modulator, be input in phase shifter by another road microwave signal, phase shifter will be input to another electrode of bipolar electrode Mach-increasing Dare modulator after another road microwave signal phase shift 180 degree;
3. regulate the bias voltage of bipolar electrode Mach-increasing Dare modulator, realize Double Sideband Suppressed Carrier modulation, export the light wave of two sidebands after bipolar electrode Mach-increasing Dare modulators modulate, the difference on the frequency of the light wave of two sidebands is 2 times of modulated microwave signal frequency;
4. the light wave of two sidebands being carried out amplification process makes its luminous power be amplified to 25dBm, then be input to after carrying out filtering process in chalcogenide glass fiber, there is four-wave mixing effect and produce the output of pectination light wave in the light wave of two sidebands, the frequency interval between the adjacent optical frequency composition of this pectination light wave is 2 times of modulated microwave signal frequency in chalcogenide glass fiber;
5. by the useless optical frequency component filtering in pectination light wave, two the optical frequency components needed are obtained;
6. adopt optical attenuator that the optical power adjustment of two the optical frequency components needed is input to beat frequency in photodetector after 0dBm, export millimeter wave, this millimeter of wave frequency just equals the difference on the frequency of two the optical frequency components being input to photodetector.
In the present embodiment, laser is distributed feedback laser, and optical attenuator is adjustable optical attenuator.
In the present embodiment, step 4. in adopt erbium-doped fiber amplifier carry out amplifications process, adopt the first optical filter to carry out filtering process, step 5. in employing the second optical filter by the useless optical frequency component filtering in pectination light wave.The passband of the second optical filter 8 is adjustable; Modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of bipolar electrode Mach-increasing Dare modulator 4.
In the present embodiment, by adjusting the passband of the second optical filter 8 to adjust the frequency multiplication number of times of millimeter wave generation system.If the frequency interval of two the optical frequency components needed is 6 times of modulated microwave signal frequency, then can realizes 6 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple; If the frequency interval of two the optical frequency components needed is 8 times of modulated microwave signal frequency, then can realizes 8 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple; If the frequency interval of two the optical frequency components needed is 10 times of modulated microwave signal frequency, then can realize 10 frequencys multiplication after photodetector beat frequency and produce high frequency millimeter ripple, by that analogy, the frequency multiplication number of times of this photoproduction millimeter wave generation system is selected by the second optical filter.When the frequency interval of two optical frequency components needed is 6 times of modulated microwave signal frequency, the 60GHz millimeter-wave signal that the output of photodetector 10 exports, this photoproduction millimeter wave generation method each step frequency of light wave schematic diagram as shown in Figure 2, f in Fig. 2
ofor the frequency of continuous light carrier signal, f is the frequency of modulated microwave signal; The filtering schematic diagram of the second filter as shown in Figure 4, wherein ω
cfor the frequency of continuous light carrier signal, ω
rFfor the frequency of modulated microwave signal, 3 ω
rFrepresent ω
rF3 times, 5 ω
rFrepresent ω
rF5 times, 6 ω
rFrepresent ω
rF6 times; The spectrogram of the input input of photodetector as shown in Figure 5; The spectrogram of the 60GHz millimeter-wave signal of the output output of photodetector 10 as shown in Figure 6.
In the present embodiment, modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of bipolar electrode Mach-increasing Dare modulator (MZM), if the frequency interval of two the optical frequency components needed is 6 times of modulated microwave signal frequency, then can obtain continuously adjustable millimeter-wave signal in 57-66GHz frequency range after photodetector beat frequency, the millimere-wave band of the unlicensed of 59-64GHz can be covered.
Claims (9)
1. based on a millimeter wave generation system for chalcogenide glass fiber four-wave mixing effect, it is characterized in that comprising for generation of luminous power be the continuous light carrier signal of 0dBm laser, for modulated microwave signal being divided into the power splitter of two way microwave signals, being used for the phase shifter of microwave signal phase shift 180 degree, bipolar electrode Mach-increasing Dare modulator, the erbium-doped fiber amplifier being used for luminous power to be amplified to 25dBm, the first optical filter, chalcogenide glass fiber, the second optical filter, being used for optical power adjustment to the optical attenuator of 0dBm and photodetector; The power of described modulated microwave signal is 15dBm;
The output of described laser is connected with the input of described bipolar electrode Mach-increasing Dare modulator, described power splitter has two outputs, be respectively the first output and the second output, an Electrode connection of the first output of described power splitter and described bipolar electrode Mach-increasing Dare modulator, second output of described power splitter is connected with the input of described phase shifter, another Electrode connection of the output of described phase shifter and described bipolar electrode Mach-increasing Dare modulator, the output of described bipolar electrode Mach-increasing Dare modulator is connected with the input of described erbium-doped fiber amplifier, the output of described erbium-doped fiber amplifier is connected with the input of the first described optical filter, the output of the first described optical filter is connected with the input of described chalcogenide glass fiber, the output of described chalcogenide glass fiber is connected with the input of the second described optical filter, the output of the second described optical filter is connected with the input of described optical attenuator, the output of described optical attenuator is connected with the input of described photodetector.
2. the millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect according to claim 1, is characterized in that the passband of the second described optical filter is adjustable.
3. the millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect according to claim 2, is characterized in that modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of described bipolar electrode Mach-increasing Dare modulator.
4. the millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect according to claim 1, it is characterized in that described laser is distributed feedback laser, described optical attenuator is adjustable optical attenuator.
5. one kind based on the millimeter wave generation method of chalcogenide glass fiber four-wave mixing effect, it is characterized in that comprising the following steps:
1. adopt laser to produce the continuous light carrier signal that luminous power is 0dBm, this continuous light carrier signal is input to the input of bipolar electrode Mach-increasing Dare modulator;
2. be that the modulated microwave signal of 15dBm is divided into two way microwave signals by power splitter by power, one tunnel microwave signal is input to an electrode of bipolar electrode Mach-increasing Dare modulator, be input in phase shifter by another road microwave signal, phase shifter will be input to another electrode of bipolar electrode Mach-increasing Dare modulator after another road microwave signal phase shift 180 degree;
3. regulate the bias voltage of bipolar electrode Mach-increasing Dare modulator, realize Double Sideband Suppressed Carrier modulation, export the light wave of two sidebands after bipolar electrode Mach-increasing Dare modulators modulate, the difference on the frequency of the light wave of two sidebands is 2 times of modulated microwave signal frequency;
4. the light wave of two sidebands being carried out amplification process makes its luminous power be amplified to 25dBm, then be input to after carrying out filtering process in chalcogenide glass fiber, there is four-wave mixing effect and produce the output of pectination light wave in the light wave of two sidebands, the frequency interval between the adjacent optical frequency composition of this pectination light wave is 2 times of modulated microwave signal frequency in chalcogenide glass fiber;
5. by the useless optical frequency component filtering in pectination light wave, two the optical frequency components needed are obtained;
6. adopt optical attenuator that the optical power adjustment of two the optical frequency components needed is input to beat frequency in photodetector after 0dBm, export millimeter wave, this millimeter of wave frequency just equals the difference on the frequency of two the optical frequency components being input to photodetector.
6. the photoproduction millimeter wave generation method based on chalcogenide glass four-wave mixing effect according to claim 5, it is characterized in that described laser is distributed feedback laser, described optical attenuator is adjustable optical attenuator.
7. the photoproduction millimeter wave generation method based on chalcogenide glass four-wave mixing effect according to claim 5, it is characterized in that during described step 4., adopting erbium-doped fiber amplifier to carry out amplification process, adopt the first optical filter to carry out filtering process, described step 5. in adopt the second optical filter by the useless optical frequency component filtering in pectination light wave.
8. the photoproduction millimeter wave generation method based on chalcogenide glass four-wave mixing effect according to claim 7, is characterized in that the passband of the second described optical filter is adjustable.
9. the millimeter wave generation system based on chalcogenide glass fiber four-wave mixing effect according to claim 5, is characterized in that modulated microwave signal frequency continuously adjustabe within the scope of 9.5-11GHz of described bipolar electrode Mach-increasing Dare modulator.
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| CN105337144A (en) * | 2015-09-23 | 2016-02-17 | 宁波大学 | System and method for generating terahertz wave on the basis of taper chalcogenide fiber four-wave mixing |
| CN106788756A (en) * | 2016-12-22 | 2017-05-31 | 中国电子科技集团公司第二十七研究所 | Ultra wide band Larger Dynamic frequency conversion channel based on Microwave photonics |
| CN109361469A (en) * | 2018-08-27 | 2019-02-19 | 宁波大红鹰学院 | Millimeter wave based on quantum dot laser generates system and generation method |
| US10284295B2 (en) | 2016-10-21 | 2019-05-07 | Industrial Technology Research Institute | Radio over fiber network node, radio access point, and communication system |
| 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 |
| CN113067643A (en) * | 2021-03-22 | 2021-07-02 | 中国电子科技集团公司第十四研究所 | MZM bias point control method of optical link containing EDFA |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105337144A (en) * | 2015-09-23 | 2016-02-17 | 宁波大学 | System and method for generating terahertz wave on the basis of taper chalcogenide fiber four-wave mixing |
| US10284295B2 (en) | 2016-10-21 | 2019-05-07 | Industrial Technology Research Institute | Radio over fiber network node, radio access point, and communication system |
| CN106788756A (en) * | 2016-12-22 | 2017-05-31 | 中国电子科技集团公司第二十七研究所 | Ultra wide band Larger Dynamic frequency conversion channel based on Microwave photonics |
| CN109361469A (en) * | 2018-08-27 | 2019-02-19 | 宁波大红鹰学院 | Millimeter wave based on quantum dot laser generates system and generation method |
| 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 |
| CN113067643A (en) * | 2021-03-22 | 2021-07-02 | 中国电子科技集团公司第十四研究所 | MZM bias point control method of optical link containing EDFA |
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