CN102394848B - 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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- CN102394848B CN102394848B CN201110045067.3A CN201110045067A CN102394848B CN 102394848 B CN102394848 B CN 102394848B CN 201110045067 A CN201110045067 A CN 201110045067A CN 102394848 B CN102394848 B CN 102394848B
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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 quantum cascade laser.Belong to 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 doubled every 18 months in the past.In order to meet growing bandwidth demand, wherein a kind of method is by adopting more advanced modulation technique to improve band efficiency, by 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 to adopt higher carrier frequency, and this has just extended to THz frequency range (0.1～10THz).
THz radiation source is the Primary Component of THz frequency range application.In numerous THz radiation producing methods, all solid state Terahertz quantum cascaded laser (THzQCL) of based semiconductor is due to advantages such as its energy conversion efficiency are high, volume is little, light and easy of integration.Therefore, it just causes once invention the study hotspot of paying close attention to widely and becoming this area.Current, the emphasis of THzQCL research mainly concentrates on the design of active area structure, the aspects such as reduction of the lifting of working temperature, continuous wave work, high emission luminous power, low sharp radio frequency rate and threshold current density.
THzQCL can be used as THz wave radiation source, is applied in THz communication system, because the modulation of THzQCL is dynamically in very large range only limited by the carrier lifetime of picosecond, more than its intrinsic bandwidth can reach 100GHz.Therefore, the modulator approach of research based on THzQCL, for following THz high-speed radiocommunication lays the foundation.
Summary of the invention
The technical problem to be solved in the present invention 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:
Produce a method for voice modulation THz ripple, the method adopts Terahertz quantum cascaded laser (THzQCL) as radiation source, and it is carried out to intensity modulated, and audio signal is loaded on THz ripple.
Preferably, make described Terahertz quantum cascaded laser (THzQCL) be operated in continuous mode.
Preferably, the Terahertz quantum cascaded laser (THzQCL) that the sharp radio frequency rate of employing is 2-7THz is as radiation source.
Further, the method that audio signal is loaded on THz ripple is: the audio signal of input is amplified, then with a direct current biasing voltage signal stack, again the voltage signal after stack is amplified, with the voltage signal after this amplification, as modulation signal, drive Terahertz quantum cascaded laser (THzQCL), produce modulation THz ripple.
Preferably, adopt power amplifier to amplify the voltage signal after described stack.
Preferably, according to light-emitting zone and the linearity of P-V-I curve of described Terahertz quantum cascaded laser (THzQCL), determine DC voltage component in described modulation signal and the peak-to-peak value of audio 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 described modulation signal is 11.3V, and the peak-to-peak value of audio signal is 0.6V.
A device for generation voice modulation THz ripple based on said method, it comprises:
Terahertz quantum cascaded laser (THzQCL) and modulation circuit thereof as radiation source;
Described modulation circuit comprises that the amplifier circuit for sound frequency signal, audio signal and the supercircuit of direct current (DC) bias signal that connect are successively, the power amplification circuit of superposed signal.
Preferably, described 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 described Terahertz quantum cascaded laser (THzQCL) is 4.1THz.
Beneficial effect of the present invention is:
The modulation THz ripple frequency range (2-7THz) producing is not yet distributed and is used at present; Modulating device adopted that energy conversion efficiency is high, volume is little, the easy of integration and semiconductor quantum cascaded laser that can be mass-produced; Adopt analog signal intensity modulated method, audio signal can be modulated on THz carrier wave, be applicable to the application of THz wave communication.
Accompanying drawing explanation
It is below the elaboration of each schematic diagram to the present invention relates to.
Fig. 1 is the apparatus structure schematic diagram that produces modulation THz ripple in embodiment;
Fig. 2 is THz intensity of wave modulation principle schematic diagram in embodiment;
Fig. 3 is the P-V-I curve of the THz QCL device that adopts in embodiment.
Embodiment
Below in conjunction with accompanying drawing, further illustrate the method and apparatus that the present invention produces voice modulation THz ripple.
The present inventor, through the further investigation to THz devices, proposes a kind of method of the generation voice modulation THz ripple based on Terahertz quantum cascaded laser.As shown in Figure 1, the method adopts THzQCL as radiation source, and it is carried out to intensity modulated, and audio signal is loaded on THz ripple.Particularly, as shown in Figure 2, the audio signal of input is amplified, then with a direct current biasing voltage signal stack, again the voltage signal after stack is amplified by power amplifier (PA), with the voltage signal after this amplification, as modulation signal, drive THzQCL, produce modulation THz ripple.
Wherein, modulation signal need to be exported by high power amplifier, to meet the operating power demand that THzQCL is larger.Preferably, according to the P-V-I curve of this THzQCL, according to its light-emitting zone and the linearity, determine DC offset voltage value in modulation signal and the peak-to-peak value of audio signal.Preferably, the THzQCL that the sharp radio frequency rate of employing is 2-7THz is as radiation source.Wherein can adopt swash radio frequency point be the THzQCL of 4.1THz as radiation source, make described THzQCL be operated in continuous mode, it is 11.3V that the amplification by power amplifier makes DC component in modulation signal, 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; Described modulation circuit comprises: amplifier circuit for sound frequency signal, audio signal and the supercircuit of direct current (DC) bias signal are, 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 as follows:
(1) THz QCL device working temperature is lower, THzQCL need to be placed on the cold head of mechanical refrigerator, and cryogenic temperature is 10K.
Wherein, 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, determine that the DC component in 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 the P-V-I curve of the THzQCL of B1316 model, in figure, the descending magnitude of voltage of scale line sign part is 11.6V, 11.3V and 11.0V successively, in voltage is 11.0V-11.6V interval, P-I, I-V curve linear degree are better, choose this middle part, interval magnitude of voltage 11.3V as modulation signal DC component, and audio signal components peak-to-peak value is limited in 0.6V, can make to present better linear relationship between outgoing luminous intensity and modulation signal voltage.
(2) modulation principle figure according to the present invention carries out circuit, to make the DC offset voltage in output voltage (modulation signal) be 11.3V to regulating circuit as required, AC signal Vp-p is 0.6V left and right, with this signal driver THzQCL, launches voice modulation THz ripple.
In the system schematic of the generation modulation THz ripple shown in Fig. 1, audio signal can be provided by microphone or music player, and THzQCL is operated in continuous wave mode.
In THz intensity of wave modulation principle schematic diagram shown in Fig. 2, the equal capable of regulating of multiplication factor of the amplitude of direct current (DC) bias, the peak-to-peak value of audio signal and power amplifier PA.
Fig. 3 is the P-V-I curve of adopted THzQCL device, can find out, in voltage is 11V-11.6V interval, P-V-I curve linear degree is better.
The other technologies that relate in the present invention belong to the familiar category of those skilled in the art, do not repeat them here.Above-described embodiment is the unrestricted technical scheme of the present invention in order to explanation only.Any technical scheme that does not depart from spirit and scope of the invention all should be encompassed in the middle of patent claim of the present invention.
Claims (7)
1. a method that produces voice modulation THz ripple, it is characterized in that: the Terahertz quantum cascaded laser that the sharp radio frequency rate of the method employing is 2-7THz is as radiation source, it is carried out to intensity modulated, audio signal is loaded on described Terahertz quantum cascaded laser and makes described Terahertz quantum cascaded laser produce modulation THz ripple;
Audio signal is loaded into the method that makes described Terahertz quantum cascaded laser produce THz ripple on described Terahertz quantum cascaded laser is: the audio signal of input is amplified, then with a direct current biasing voltage signal stack, again the voltage signal after stack is amplified, with the voltage signal after this amplification, as modulation signal, drive Terahertz quantum cascaded laser, produce modulation THz ripple.
2. the method for generation voice modulation THz ripple according to claim 1, is characterized in that: make described 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: adopt power amplifier to amplify the voltage signal after described stack.
4. the method for generation voice modulation THz ripple according to claim 1, it is characterized in that: according to light-emitting zone and the linearity of the P-V-I curve of described Terahertz quantum cascaded laser, determine DC voltage component in described modulation signal and the peak-to-peak value of audio signal.
5. the method for generation voice modulation THz ripple according to claim 1, 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 described modulation signal is 11.3V, and the peak-to-peak value of audio signal is 0.6V.
6. a device that produces voice modulation THz ripple, is characterized in that, comprising: the Terahertz quantum cascaded laser and the modulation circuit thereof that as the sharp radio frequency rate of radiation source, are 2-7THz; Described modulation circuit comprises that the amplifier circuit for sound frequency signal, audio signal and the supercircuit of direct current (DC) bias signal that connect are successively, the power amplification circuit of superposed signal; Described Terahertz quantum cascaded laser is connected with the output of described power amplification circuit.
7. the device of generation voice modulation THz ripple according to claim 6, is characterized in that: the sharp radio frequency point of described Terahertz quantum cascaded laser is 4.1THz.
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| 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 |
| CN108390238B (en) * | 2018-01-29 | 2019-09-17 | 雄安华讯方舟科技有限公司 | Terahertz driving device |
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| CN201222732Y (en) * | 2008-05-23 | 2009-04-15 | 辛承旭 | Sound remote controller and audiovisual system matched with the same |
| CN101583061A (en) * | 2009-06-26 | 2009-11-18 | 电子科技大学 | Micro speaker with directional transaudient function |
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| US7330665B2 (en) * | 2002-11-22 | 2008-02-12 | Hrl Laboratories, Llc | Optical frequency modulated transmitter |
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| CN201222732Y (en) * | 2008-05-23 | 2009-04-15 | 辛承旭 | Sound remote controller and audiovisual system matched with the same |
| CN101583061A (en) * | 2009-06-26 | 2009-11-18 | 电子科技大学 | Micro speaker with directional transaudient function |
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