CN102394848A - Method and device for generating audio modulation THz wave - Google Patents
Method and device for generating audio modulation THz wave Download PDFInfo
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- CN102394848A CN102394848A CN2011100450673A CN201110045067A CN102394848A CN 102394848 A CN102394848 A CN 102394848A CN 2011100450673 A CN2011100450673 A CN 2011100450673A CN 201110045067 A CN201110045067 A CN 201110045067A CN 102394848 A CN102394848 A CN 102394848A
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Abstract
The invention discloses a method and device for generating an audio modulation THz wave, applicable to THz communication application in the future. In the method, a THz quantum cascade laser is taken as a radiation source, intensity modulation is carried out on the THz quantum cascade laser, and an audio signal is loaded onto the THz wave. The device comprises the THz quantum cascade laser taken as the radiation source and a modulation circuit thereof, wherein the modulation circuit comprises an audio signal amplifying circuit, an audio signal and direct current bias signal superposing circuit and a superposed signal power amplifying circuit. By adopting the method and device disclosed by the invention, a modulation THz wave in a frequency band of 2-7THz can be generated, wherein the frequency band is not allocated or applied at present; and the adopted THz quantum cascade laser has high energy conversion efficiency, a small volume and easiness in integration and can be produced in a large scale.
Description
Technical field
The present invention relates to a kind of method and apparatus that produces voice modulation THz ripple, particularly the analog intensity modulator approach of THz QCL.Belong to the semiconductor photoelectric device applied technical field.
Background technology
According to the bandwidth law of Edholm, in 25 years, the bandwidth demand of short distance radio communication system whenever doubled at a distance from 18 months in the past.In order to satisfy growing bandwidth demand; Wherein a kind of method is through adopting more advanced modulation technique to improve band efficiency; Through adopting multiple multiplex mode to increase channel capacity, but Shannon's theorems is told us, and the data transmission capabilities that this method provides is still limited.For enough bandwidth are provided, people need adopt higher carrier frequency, and this has just extended to THz frequency range (0.1～10THz).
The THz radiation source is a THz frequency range key in application device.In numerous THz radiation producing methods, all solid state Terahertz quantum cascaded laser (THzQCL) of based semiconductor is owing to advantages such as its energy conversion efficiency are high, volume is little, light and easy of integration.Therefore, it just causes the research focus of paying close attention to widely and becoming this area once invention.Current, the emphasis of THzQCL research mainly concentrates on lifting, continuous wave work, high emission luminous power, the low aspects such as reduction that swash radio frequency rate and threshold current density of the design of active area structure, working temperature.
THzQCL can be used as THz wave radiation source, is applied in the THz communication system, because the modulation of THzQCL is dynamic in very large range only by the carrier lifetime restriction of picosecond, its intrinsic bandwidth can reach more than the 100GHz.Therefore, research is based on the modulator approach of THzQCL, for following THz high-speed radiocommunication lays the foundation.
Summary of the invention
The technical problem that the present invention will solve is to provide a kind of method and apparatus that produces voice modulation THz ripple, is applicable to following THz communications applications.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of method that produces voice modulation THz ripple, this method adopt Terahertz quantum cascaded laser (THzQCL) as radiation source, and it is carried out intensity modulated, and audio signal is loaded on the THz ripple.
Preferably, make said Terahertz quantum cascaded laser (THzQCL) be operated in continuous mode.
Preferably, adopt swashing the radio frequency rate is that the Terahertz quantum cascaded laser (THzQCL) of 2-7THz is as radiation source.
Further; The method that audio signal is loaded on the THz ripple is: the audio signal of input is amplified; Superpose with a direct current biasing voltage signal then; Voltage signal after will superposeing again amplifies, and drives Terahertz quantum cascaded laser (THzQCL) with the voltage signal after this amplification as modulation signal, produces modulation THz ripple.
Preferably, adopt voltage signal after power amplifier amplifies said stack.
Preferably, according to the light-emitting zone and the linearity of P-V-I curve of said Terahertz quantum cascaded laser (THzQCL), confirm DC voltage component and the peak-to-peak value of audio signal in the said modulation signal.
Preferably, the Terahertz quantum cascaded laser (THzQCL) that the sharp radio frequency point of employing is 4.1THz is as radiation source, and making the DC component in the said modulation signal is 11.3V, and the peak-to-peak value of audio signal is 0.6V.
A kind of device of the generation voice modulation THz ripple based on said method, it comprises:
Terahertz quantum cascaded laser (THzQCL) and modulation circuit thereof as radiation source;
Said modulation circuit comprises the supercircuit of the amplifier circuit for sound frequency signal, audio signal and the Dc bias signal that connect successively, the power amplification circuit of superposed signal.
Preferably, said Terahertz quantum cascaded laser (THzQCL) is operated in continuous mode, and its sharp radio frequency rate is 2-7THz.
Preferably, the sharp radio frequency point of said Terahertz quantum cascaded laser (THzQCL) is 4.1THz.
Beneficial effect of the present invention is:
The still unallocated at present use of modulation THz ripple frequency range (2-7THz) that produces; Modulating device has adopted the semiconductor quantum cascaded laser that energy conversion efficiency is high, volume is little, easy of integration and can be mass-produced; Adopt analog signal intensity modulated method, can audio signal be modulated on the THz carrier wave, be applicable to the application of THz wave communication.
Description of drawings
It below is elaboration to each sketch map that the present invention relates to.
Fig. 1 is the apparatus structure sketch map that produces modulation THz ripple among the embodiment;
Fig. 2 is a THz intensity of wave modulation principle sketch map among the embodiment;
Fig. 3 is the P-V-I curve of the THz QCL device that adopted among the embodiment.
Embodiment
Further specify the method and apparatus that the present invention produces voice modulation THz ripple below in conjunction with accompanying drawing.
Inventor of the present invention is through the further investigation to the Terahertz device, proposes a kind of method of the generation voice modulation THz ripple based on Terahertz quantum cascaded laser.As shown in Figure 1, this method adopts THzQCL as radiation source, and it is carried out intensity modulated, and audio signal is loaded on the THz ripple.Particularly, as shown in Figure 2, the audio signal of input is amplified; Superpose with a direct current biasing voltage signal then; Voltage signal after will superposeing again amplifies through power amplifier (PA), drives THzQCL with the voltage signal after this amplification as modulation signal, produces modulation THz ripple.
Wherein, modulation signal need be exported by high power amplifier, to satisfy the bigger operating power demand of THzQCL.Preferably, according to the P-V-I curve of this THzQCL,, confirm dc offset voltage value and the peak-to-peak value of audio signal in the modulation signal according to its light-emitting zone and the linearity.Preferably, adopt swashing the radio frequency rate is that the THzQCL of 2-7THz is as radiation source.Wherein can adopt swash radio frequency point be the THzQCL of 4.1THz as radiation source, make said THzQCL be operated in continuous mode, the amplification through power amplifier makes that DC component is 11.3V in the modulation signal, the audio signal peak-to-peak value is 0.6V.
Based on above thought, the present invention has designed a kind of device that produces voice modulation THz ripple, and it comprises: radiation source THzQCL and modulation circuit thereof; Said modulation circuit comprises: the supercircuit of amplifier circuit for sound frequency signal, audio signal and Dc bias signal, the power amplification circuit of superposed signal.Preferably, this THzQCL is operated in continuous mode, and its sharp radio frequency rate is 2-7THz, and swashing radio frequency point is 4.1THz.
Consult Fig. 1, Fig. 2 and Fig. 3, adopt the embodiment of said method and device generation voice modulation THz ripple following:
(1) THz QCL device working temperature is lower, need THzQCL be placed on the cold head of mechanical refrigerator, and cryogenic temperature is 10K.
Wherein, the employing model is B1316, and the THzQCL that sharp radio frequency point is 4.1THz is as emission source; According to its P-V-I curve; Consider its light-emitting zone and the linearity, confirm that the DC component in the modulation signal is 11.3V, the peak-to-peak value Vp-p of modulation signal sound intermediate frequency signal component is 0.6V.Be illustrated in figure 3 as the P-V-I curve of the THzQCL of B1316 model; The descending magnitude of voltage of scale line sign part is 11.6V, 11.3V and 11.0V successively among the figure; P-I, I-V curve linear degree are better in voltage is the 11.0V-11.6V interval; Choose this middle part, interval magnitude of voltage 11.3V as the modulation signal DC component, and the audio signal components peak-to-peak value is limited in the 0.6V, can make between outgoing luminous intensity and the modulation signal voltage to present better linear relationship.
(2) modulation principle figure according to the present invention carries out circuit, and regulating circuit makes that the dc offset voltage in the output voltage (modulation signal) is 11.3V as required, and AC signal Vp-p is about 0.6V, drives THzQCL with this signal, launches voice modulation THz ripple.
In the system schematic of generation modulation THz ripple shown in Figure 1, audio signal can be provided by microphone or music player, and THzQCL is operated in continuous wave mode.
In the THz intensity of wave modulation principle sketch map shown in Figure 2, it is whole that the times magnification number average of the amplitude of Dc bias, the peak-to-peak value of audio signal and power amplifier PA is adjustable.
Fig. 3 is the P-V-I curve of the THzQCL device that adopted, can find out that in voltage was the 11V-11.6V interval, P-V-I curve linear degree was better.
The other technologies that relate among the present invention belong to the category that those skilled in the art are familiar with, and repeat no more at this.The foregoing description is the unrestricted technical scheme of the present invention in order to explanation only.Any technical scheme that does not break away from spirit and scope of the invention all should be encompassed in the middle of the patent claim of the present invention.
Claims (10)
1. method that produces voice modulation THz ripple is characterized in that: this method adopts Terahertz quantum cascaded laser as radiation source, and it is carried out intensity modulated, and audio signal is loaded on the THz ripple.
2. the method for generation voice modulation THz ripple according to claim 1 is characterized in that: make said Terahertz quantum cascaded laser be operated in continuous mode.
3. the method for generation voice modulation THz ripple according to claim 1 is characterized in that: the Terahertz quantum cascaded laser that the sharp radio frequency rate of employing is 2-7THz is as radiation source.
4. the method for generation voice modulation THz ripple according to claim 1 is characterized in that:
The method that audio signal is loaded on the THz ripple is: the audio signal of input is amplified; Superpose with a direct current biasing voltage signal then; Voltage signal after will superposeing again amplifies; Voltage signal with after this amplification drives Terahertz quantum cascaded laser as modulation signal, produces modulation THz ripple.
5. the method for generation voice modulation THz ripple according to claim 4 is characterized in that: adopt the voltage signal after power amplifier amplifies said stack.
6. the method for generation voice modulation THz ripple according to claim 4; It is characterized in that:, confirm DC voltage component and the peak-to-peak value of audio signal in the said modulation signal according to the light-emitting zone and the linearity of the P-V-I curve of said Terahertz quantum cascaded laser.
7. the method for generation voice modulation THz ripple according to claim 4; It is characterized in that: the Terahertz quantum cascaded laser that the sharp radio frequency point of employing is 4.1THz is as radiation source; Making the DC component in the said modulation signal is 11.3V, and the peak-to-peak value of audio signal is 0.6V.
8. a device that produces voice modulation THz ripple is characterized in that, comprising: as the Terahertz quantum cascaded laser and the modulation circuit thereof of radiation source; Said modulation circuit comprises the supercircuit of the amplifier circuit for sound frequency signal, audio signal and the Dc bias signal that connect successively, the power amplification circuit of superposed signal.
9. the device of generation voice modulation THz ripple according to claim 8, it is characterized in that: said Terahertz quantum cascaded laser is operated in continuous mode, and its sharp radio frequency rate is 2-7THz.
10. the device of generation voice modulation THz ripple according to claim 9 is characterized in that: the sharp radio frequency point of said Terahertz quantum cascaded laser is 4.1THz.
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Cited By (4)
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| CN103928841A (en) * | 2014-04-16 | 2014-07-16 | 中国科学院上海微系统与信息技术研究所 | High-speed modulation method and device for terahertz quantum cascade laser |
| CN104104448A (en) * | 2014-07-16 | 2014-10-15 | 上海航天电子通讯设备研究所 | Visible light communication receiving and transmitting integrated device based on Ethernet |
| CN107768970A (en) * | 2017-09-19 | 2018-03-06 | 中国科学院上海微系统与信息技术研究所 | A kind of pulse mode Terahertz quantum cascaded laser radio-frequency modulations system and method |
| WO2019144499A1 (en) * | 2018-01-29 | 2019-08-01 | 雄安华讯方舟科技有限公司 | Terahertz driving device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103928841A (en) * | 2014-04-16 | 2014-07-16 | 中国科学院上海微系统与信息技术研究所 | High-speed modulation method and device for terahertz quantum cascade laser |
| CN103928841B (en) * | 2014-04-16 | 2017-06-06 | 中国科学院上海微系统与信息技术研究所 | A kind of High Speed Modulation method and device of Terahertz quantum cascaded laser |
| CN104104448A (en) * | 2014-07-16 | 2014-10-15 | 上海航天电子通讯设备研究所 | Visible light communication receiving and transmitting integrated device based on Ethernet |
| CN107768970A (en) * | 2017-09-19 | 2018-03-06 | 中国科学院上海微系统与信息技术研究所 | A kind of pulse mode Terahertz quantum cascaded laser radio-frequency modulations system and method |
| WO2019144499A1 (en) * | 2018-01-29 | 2019-08-01 | 雄安华讯方舟科技有限公司 | Terahertz driving device |
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