CN102394689B - Terahertz wave-based method and system for implementing audio radio communication link - Google Patents
Terahertz wave-based method and system for implementing audio radio communication link Download PDFInfo
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Abstract
The invention discloses a terahertz wave-based method and a system for implementing an audio radio communication link. An audio radio communication link system comprises a transmitting end and a receiving end, wherein the transmitting end comprises a drive circuit and a THzQCL (terahertz quantum cascade laser ) connected with the drive circuit; the drive circuit adopts intensity modulation and outputs driving voltage signals superimposed with audio signals so as to drive the THzQCL to radiate corresponding terahertz wave signals; the receiving end comprises THzQWP(terahertz quantum well photodetector) and a signal detection circuit connected with the THzQWP; and the signal detection circuit adopts a photoconduction model, applies stable bias voltage to the THzQWP, converts photo current signals which pass through the THzQWP into voltage signal through an transresistance amplifier, filters and amplifies the voltage signals, and outputs the filtered and amplified signals to acoustic equipment. Due to the adoption of the method and the system for implementing the audio radio communication link, an audio player outputs the audio signals, clear acoustical signals are acquired at the detection end of the THzQWP, and the demonstration that terahertz waves transmit the acoustical signals in real time is successfully completed.
Description
Technical field
The present invention relates to a kind of audio wireless communication link implementation method and system based on Terahertz (THz) wave band, refer in particular to a kind of based on Terahertz quantum cascaded laser (Quantum Cascade Lasers, QCL) and audio wireless communication link implementation method and the system of quantum well detector (Quantum Well Photodetector, QWP).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.
THz radiation source is the Primary Component of THz frequency range application.In numerous THz radiation producing methods, the full solid T HzQCL 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.
THzQWP is a kind of important arrowband detector, has good spectrally resolved ability and very fast response speed, in high sensitivity and high-resolution, surveys especially at focal plane array and has unique advantage aspect preparing.At present, the quantum well detector based on GaAs/AlGaAs material system mainly contains two kinds of photoconduction type and photovoltaic types, and the quantum well detector of the THz wave band of having reported belongs to photoconduction type more.
In view of the further investigation to THz wave band device, the present invention proposes a kind of THzQCL of utilization as emission source, and photoconduction type THzQWP is as audio wireless communication link and the implementation method of detector.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of audio wireless communication link implementation method and system based on THz wave, utilize Terahertz quantum cascaded laser and quantum well detector, by the method for system building, designed, designed modulation /demodulation and the circuit of transmitting terminal receiving terminal, realize and utilize THz ripple real-time Transmission audio signal.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
An implementation method for audio wireless communication link based on THz wave, comprises the following steps:
Adopt Terahertz quantum cascaded laser (THzQCL) as radiate source radiation THz ripple, and it is carried out to intensity modulated, audio signal is loaded on THz ripple;
Adopt Terahertz quantum well detector (THzQWP) to receive the THz ripple that described Terahertz quantum cascaded laser (THzQCL) radiate source radiation goes out, detect THz ripple signal; Wherein, the photo-signal by Terahertz quantum well detector (THzQWP) is changed into voltage signal, and to this voltage signal filtering and amplification, then export to stereo set.
As one of preferred version of the present invention, the method that audio signal is loaded on THz ripple is: after the audio signal of input is amplified, superpose with direct current (DC) bias signal, again the voltage signal after stack is amplified by high-power amplifying circuit, then the voltage signal after amplifying with this drives Terahertz quantum cascaded laser (THzQCL) radiation source, with radiation THz ripple.
Further preferably, when the voltage signal after stack is amplified by high-power amplifying circuit, make direct current (DC) bias partly be enlarged into 11.3V, the peak-to-peak value V of audio signal parts
p-pbe enlarged into 0.6V.
As one of preferred version of the present invention, while detecting THz ripple signal, adopt photoconductive pattern, add stable bias voltage to Terahertz quantum well detector (THzQWP), through trans-impedance amplifier, the photoelectric current by Terahertz quantum well detector (THzQWP) is changed into voltage.
Further preferably, be-50mV to the added stable bias voltage of Terahertz quantum well detector (THzQWP).
According to above-mentioned implementation method, the present invention also proposes a kind of audio wireless communication link system based on THz wave, and it comprises: transmitting terminal and receiving terminal;
Described transmitting terminal comprises: drive circuit and the Terahertz quantum cascaded laser (THzQCL) being attached thereto;
Described drive circuit comprises: the supercircuit of amplifier circuit for sound frequency signal, audio signal and the direct current (DC) bias signal connecting in turn, for the audio signal output according to input, be superimposed with the drive voltage signal of audio signal, thereby drive the corresponding terahertz wave signal of described Terahertz quantum cascaded laser (THzQCL) radiation;
Described receiving terminal comprises: Terahertz quantum well detector (THzQWP) and the signal deteching circuit being attached thereto;
Described Terahertz quantum well detector (THzQWP) receives described terahertz wave signal by light guide, and the terahertz wave signal receiving is converted into photo-signal is sent to described signal deteching circuit;
Described signal deteching circuit comprises: the change-over circuit that photo-signal is converted to voltage signal, the voltage signal filter amplification circuit that connect in turn, and for the photo-signal receiving being converted into voltage signal and filter and amplification exports external audio equipment to.
As one of preferred version of the present invention, the drive circuit of described transmitting terminal also comprises superposed signal power amplification circuit, described superposed signal power amplification circuit is connected with the supercircuit of direct current (DC) bias signal with described audio signal, for the voltage signal after stack is amplified, and with the described Terahertz quantum cascaded laser of driving.It is amplifying device that wherein said superposed signal power amplification circuit adopts high power amplifier, to meet the demand of Terahertz quantum cascaded laser (THzQCL) high-voltage large current.
As one of preferred version of the present invention, in described signal deteching circuit, the input of change-over circuit is connected with constant bias, by trans-impedance amplifier, photo-signal is converted to voltage signal.
Beneficial effect of the present invention is:
The THzQCL drive circuit of making by designed, designed and THzQWP signal deteching circuit, realized audio signal is loaded in THz wave and is transmitted, and receive, the object of reduction audio signal, less in the distortion of modulation and demodulation process sound intermediate frequency signal.Adopt audio wireless communication link implementation method of the present invention and system, by audio player output audio signal, can obtain voice signal clearly in THzQWP end of probe, successfully complete the demonstration of THz wave real-time Transmission voice signal.
Accompanying drawing explanation
It is below the elaboration of each schematic diagram to the present invention relates to.
Fig. 1 is the structural representation of embodiment sound intermediate frequency wireless communication link system;
Fig. 2 is the schematic diagram of THzQCL drive circuit in embodiment;
Fig. 3 is the part schematic diagram of THzQWP signal deteching circuit in embodiment.
Embodiment
Below in conjunction with accompanying drawing, further illustrate audio wireless communication link implementation method and the system based on THz wave of the present invention, by introducing the lecture experiment of THz ripple radio communication, the feasibility of content of the present invention is described.
The present inventor is through the further investigation to THz devices, by the method for system building, designed, designed modulation /demodulation and the circuit of transmitting terminal receiving terminal, a kind of implementation method of the audio wireless communication link based on Terahertz quantum cascaded laser and quantum well detector is proposed.
The method adopts THzQCL as radiate source radiation THz ripple, and it is carried out to intensity modulated, and audio signal is loaded on THz ripple; Wherein, the method that audio signal is loaded on THz ripple is: after the audio signal of input is amplified, with a direct current bias voltage signal stack, then the voltage signal after stack is amplified by high-power amplifying circuit, making direct current (DC) bias is 11.3V, the V of audio signal
p-pfor 0.6V, the voltage signal after then amplifying with this drives THzQCL radiation source, with radiation THz ripple.Then by light guide, adopt THzQWP to receive the THz ripple that described THzQCL radiate source radiation goes out, detect THz ripple signal; Wherein, the photo-signal by THzQWP is changed into voltage signal, and to this voltage signal filtering amplification, then export to stereo set; While detecting THz ripple signal, adopt photoconductive pattern, to the stable bias voltage of add-50mV of THzQWP, through trans-impedance amplifier, the photoelectric current by THzQWP is changed into voltage.
The audio wireless communication link system designing and producing based on said method, comprising: transmitting terminal and receiving terminal, as shown in Figure 1.
Described transmitting terminal comprises: drive circuit and the THzQCL being attached thereto.Wherein, described drive circuit is superimposed with the drive voltage signal of audio signal for the audio signal output according to input, thereby drives the corresponding THz ripple of described THzQCL radiation signal.This drive circuit comprises: the supercircuit of amplifier circuit for sound frequency signal, audio signal and the direct current (DC) bias signal connecting in turn.Preferably, this drive circuit also comprises the power amplification circuit of superposed signal, the power amplification circuit of this superposed signal is connected with the supercircuit of direct current (DC) bias signal with described audio signal, for the voltage signal after stack is amplified, and with the described THzQCL of driving, make the voltage of direct current (DC) bias part be positioned at the middle part in the V-P curve linear district of this THzQCL, to reduce the distortion of signal transmission.Wherein can to adopt high power amplifier be amplifying device to the power amplification circuit of this superposed signal, to meet the demand of THzQCL high-voltage large current.Fig. 2 provides a kind of possible circuit theory diagrams of described drive circuit, but the drive circuit in the present invention is not limited only to this, as seen from the figure, this drive circuit comprises amplifier circuit for sound frequency signal, audio signal and the supercircuit of direct current (DC) bias signal and the power amplification circuit of superposed signal three parts that connect in turn.
Described receiving terminal comprises: THzQWP and the signal deteching circuit being attached thereto.Described THzQWP receives described THz ripple signal by light guide, and the THz ripple signal receiving is converted into photo-signal is sent to described signal deteching circuit; Described signal deteching circuit comprises: the change-over circuit that photo-signal is converted to voltage signal, the voltage signal filter amplification circuit that connect in turn, and for the photo-signal receiving being converted into voltage signal and filter and amplification exports external audio equipment to.Preferably, in described signal deteching circuit, the input of change-over circuit is connected with constant bias, by trans-impedance amplifier, photo-signal is converted to voltage signal.Fig. 3 provides the circuit theory diagrams that the part in described signal deteching circuit is possible, but signal deteching circuit in the present invention is not limited only to this.
According to Fig. 1, Fig. 2 and Fig. 3, in the present embodiment, the lecture experiment of THz ripple radio communication comprises the steps:
(1) THzQCL and THzQWP are contained in respectively on refrigeration machine cold head, optical system for alignment, makes the luminous point of THzQCL be positioned at the focus place of throwing face mirror M1, and the luminous point that is subject to of THzQWP is positioned at the focus place of throwing face mirror M2.2 meters, M1 and M2 interval.Referring to Fig. 1.
(2) THzQCL drive circuit employing ± 18V power supply.Audio signal provides (also can be provided by microphone) by MP3 player.Potentiometer in regulating circuit, can regulate the ratio of audio signal voltage component and direct voltage.Referring to Fig. 2.
(3) superposed signal of exporting in Fig. 2 is amplified through high-power voltage amplifier, and making the DC offset voltage in superposed signal is 11.3V (this is the middle part in the V-P curve linear district of THzQCL), audio signal (AC signal) V
p-pfor 0.6V left and right, with this voltage signal, drive THzQCL.Less in the distortion of modulation and demodulation process sound intermediate frequency signal like this.
(4) the THzQWP signal deteching circuit in Fig. 3 adopts 4 joint dry cell power supplies, and supply power voltage is ± 3V.Be about-the 50mV of bias voltage that offers Bias-Volt end, this voltage is adjustable.J1 mouth meets THzQWP, and J2 mouth signal exports oscilloscope, earphone or other stereo sets to.
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 (6)
1. an implementation method for the audio wireless communication link based on THz wave, is characterized in that, comprises the following steps:
Terahertz quantum cascaded laser and Terahertz quantum well detector are contained in respectively on refrigeration machine cold head, optical system for alignment, make the luminous point of Terahertz quantum cascaded laser be positioned at the focus place of a throwing face mirror, the luminous point that is subject to of Terahertz quantum well detector is positioned at the focus place that another throws face mirror;
Adopt Terahertz quantum cascaded laser as radiate source radiation THz ripple, and it is carried out to intensity modulated, audio signal is loaded on THz ripple;
Adopt Terahertz quantum well detector to receive the THz ripple that described Terahertz quantum cascaded laser radiate source radiation goes out, detect THz ripple signal; Wherein, the photo-signal by Terahertz quantum well detector is changed into voltage signal, and to this voltage signal filtering and amplification, then export to stereo set;
Wherein, the method that audio signal is loaded on THz ripple is: after the audio signal of input is amplified, superpose with direct current (DC) bias signal, again the voltage signal after stack is amplified by high-power amplifying circuit, then the voltage signal after amplifying with this drives Terahertz quantum cascaded laser radiation source, with radiation THz ripple; When the voltage signal after stack is amplified by high-power amplifying circuit, make direct current (DC) bias partly be enlarged into 11.3V, the peak-to-peak value V of audio signal parts
p-pbe enlarged into 0.6V; Wherein, regulate the ratio of audio signal voltage component and direct voltage by the potentiometer in regulating circuit, then the voltage signal after stack is amplified by high-power amplifying circuit, Terahertz quantum well detector applies stable bias voltage.
2. the implementation method of the audio wireless communication link based on THz wave according to claim 1, it is characterized in that: while detecting THz ripple signal, adopt photoconductive pattern, add stable bias voltage to Terahertz quantum well detector, through trans-impedance amplifier, the photoelectric current by Terahertz quantum well detector is changed into voltage.
3. the implementation method of the audio wireless communication link based on THz wave according to claim 2, is characterized in that: to the added stable bias voltage of Terahertz quantum well detector, be-50mV.
4. the audio wireless communication link system based on THz wave, is characterized in that, comprising: transmitting terminal and receiving terminal;
Described transmitting terminal comprises: drive circuit and the Terahertz quantum cascaded laser being attached thereto;
Described drive circuit comprises: the supercircuit of amplifier circuit for sound frequency signal, audio signal and the direct current (DC) bias signal connecting in turn, for the audio signal output according to input, be superimposed with the drive voltage signal of audio signal, thereby drive the corresponding terahertz wave signal of described Terahertz quantum cascaded laser radiation;
Described receiving terminal comprises: Terahertz quantum well detector and the signal deteching circuit being attached thereto;
Described Terahertz quantum well detector receives described terahertz wave signal by light guide, and the terahertz wave signal receiving is converted into photo-signal is sent to described signal deteching circuit;
Described signal deteching circuit comprises: the change-over circuit that photo-signal is converted to voltage signal, the voltage signal filter amplification circuit that connect in turn, for the photo-signal receiving being converted into voltage signal and filter and amplification exports external audio equipment to;
Wherein, the drive circuit of described transmitting terminal also comprises superposed signal power amplification circuit, described superposed signal power amplification circuit is connected with the supercircuit of direct current (DC) bias signal with described audio signal, for the voltage signal after stack is amplified, and with the described Terahertz quantum cascaded laser of driving;
Wherein, Terahertz quantum cascaded laser and Terahertz quantum well detector are contained in respectively on refrigeration machine cold head, optical system for alignment, makes the luminous point of Terahertz quantum cascaded laser be positioned at the focus place of a throwing face mirror, and the luminous point that is subject to of Terahertz quantum well detector is positioned at the focus place that another throws face mirror; By the potentiometer in regulating circuit, regulate the ratio of audio signal voltage component and direct voltage, again the voltage signal after stack is amplified by high-power amplifying circuit, when the voltage signal after stack is amplified by high-power amplifying circuit, make direct current (DC) bias partly be enlarged into 11.3V, the peak-to-peak value V of audio signal parts
p-pbe enlarged into 0.6V, at receiving terminal, Terahertz quantum well detector applied to stable bias voltage.
5. the audio wireless communication link system based on THz wave according to claim 4, is characterized in that: it is amplifying device that described superposed signal power amplification circuit adopts high power amplifier.
6. the audio wireless communication link system based on THz wave according to claim 4, it is characterized in that: in described signal deteching circuit, the input of change-over circuit is connected with constant bias, by trans-impedance amplifier, photo-signal is converted to voltage signal.
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| 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 |
| CN104410463A (en) * | 2014-11-25 | 2015-03-11 | 中国航天科技集团公司第五研究院第五一三研究所 | Method and system for laser communication on basis of quantum cascade laser |
| CN105120398B (en) * | 2015-09-09 | 2019-07-12 | 海信集团有限公司 | A kind of speaker and sound box system |
| 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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