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CN106299978B - System occurs for the Terahertz based on unidirectional carrier transport photodetector - Google Patents

System occurs for the Terahertz based on unidirectional carrier transport photodetector Download PDF

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Publication number
CN106299978B
CN106299978B CN201610912891.7A CN201610912891A CN106299978B CN 106299978 B CN106299978 B CN 106299978B CN 201610912891 A CN201610912891 A CN 201610912891A CN 106299978 B CN106299978 B CN 106299978B
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China
Prior art keywords
terahertz
photodetector
pulse laser
carrier transport
unidirectional carrier
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CN201610912891.7A
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CN106299978A (en
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郑渚
杨彬
丁庆
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Heilongjiang Huaxun Intelligent Manufacturing Co ltd
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Shenzhen Institute of Terahertz Technology and Innovation
Shenzhen Huaxun Ark Technology Co Ltd
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Priority to CN201610912891.7A priority Critical patent/CN106299978B/en
Publication of CN106299978A publication Critical patent/CN106299978A/en
Priority to PCT/CN2017/106256 priority patent/WO2018072661A1/en
Priority to JP2018524759A priority patent/JP6635620B2/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S1/00Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
    • H01S1/02Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Communication System (AREA)

Abstract

Occurs system the present invention relates to a kind of Terahertz of unidirectional carrier transport photodetector.System, which occurs, for the Terahertz of unidirectional carrier transport photodetector includes picosecond pulse laser, transport module, beam splitter, amplitude modulation(PAM) module, unidirectional carrier transport photodetector and terahertz detection device.Picosecond pulse laser launches the pulse laser of the higher psec two-stage of repetition rate, is transmitted through transport module and can realize the spectrum widening of picosecond pulse laser, to obtain pulsewidth as tens of to hundreds of left and right femtoseconds.Then inputted after being modulated through amplitude modulation(PAM) module to unidirectional carrier transport photodetector, because unidirectional carrier transport photodetector can realize big light intensity, high rate data transmission characteristic, high power, the terahertz pulse signal of high-speed can be inspired, so as to realize high power, the terahertz pulse signal communication of high-speed.

Description

System occurs for the Terahertz based on unidirectional carrier transport photodetector
Technical field
The present invention relates to Terahertz Technology field, the more particularly to terahertz based on unidirectional carrier transport photodetector Hereby occurs system.
Background technology
Terahertz frequency range, because its device aspect can match in excellence or beauty the huge bandwidth resources of optics frequency range, it is considered to be under One of target frequency bands of generation communication, and in Terahertz frequency range, obtained more using the communication system of continuous wave (point carrier frequency) Sufficiently research, and the communication of analogy optics frequency range, in addition to for continuous wave modulation and signal radiation pattern, are sent out using pulse Penetrate be also a class main flow mode, contrast continuous wave modulate emission, impulse ejection has bandwidth bigger, traffic rate is higher, arteries and veins Rush longer advantage of keeping at a distance.
At present, in Terahertz frequency range, continuous wave modulation is the main way of signal loading, and impulse modulation is due to repetitive rate The problems such as (repetition rate) is relatively low, pulse power is small is difficult to realize high-speed transfer.
The content of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing that a kind of repetitive rate is high, pulse power is big based on unidirectional carrier System occurs for the Terahertz for transmitting photodetector.
System occurs for a kind of Terahertz based on unidirectional carrier transport photodetector, including:
Picosecond pulse laser, for launching picosecond pulse laser;
Transport module, for transmitting the picosecond pulse laser and realizing the broadening of the picosecond pulse laser;
Beam splitter, for the picosecond pulse laser of broadening to be divided into pump light and detection light;
Amplitude modulation(PAM) module, switch letter is carried out for receiving the pump light and detection light respectively, and to the pump light Number modulation, to it is described detection light carry out light intensity modulation;
On unidirectional carrier transport photodetector, the direction of propagation for being arranged on the pump light, for exciting the pump Pu light simultaneously gives off terahertz pulse signal;
Terahertz detection device, for receiving the detection light and being detected to the terahertz pulse signal.
In one of the embodiments, the transport module includes highly nonlinear optical fiber, and the highly nonlinear optical fiber is used for Transmission picosecond pulse laser simultaneously enters line broadening to the picosecond pulse laser.
In one of the embodiments, the transport module also includes single-mode fiber, the single-mode fiber and the Gao Fei Linear optical fiber is connected, and the picosecond pulse laser that the single-mode fiber is handled the broadening carries out dispersion compensation.
In one of the embodiments, the amplitude modulation(PAM) module includes the first amplitude modulator and the second amplitude modulation(PAM) Device, first amplitude modulator is arranged on the direction of propagation of the pump light, for loaded switches modulated signal;
Second amplitude modulator is arranged on the direction of propagation of the detection light, for carrying out light to the detection light Strong intensity modulated.
In one of the embodiments, the terahertz detection device includes optical delay wire module and photoconductive antenna, The optical delay wire module is used for the time delay for adjusting the pump light and detection light, and the photoconductive antenna is used to detect The terahertz pulse signal.
In one of the embodiments, the terahertz detection device includes optical delay wire module and envelope detector, Described to prolong the time delay that the slow wire module of optics is used to adjust the pump light and detection light, the envelope detector is used to detect The terahertz pulse signal.
In one of the embodiments, in addition to erbium-doped fiber amplifier, the erbium-doped fiber amplifier is arranged on described Between picosecond pulse laser and transport module, for being amplified processing to picosecond pulse laser.
In one of the embodiments, the beam splitter is fiber coupler, the input of the fiber coupler and institute Single-mode fiber connection is stated, the first output end of the fiber coupler is used to export the pump light, the fiber coupler Second output end is used to export the detection light.
In one of the embodiments, the beam splitter is beam splitter.
In one of the embodiments, the repetition rate of the picosecond pulse laser is more than or equal to 10GHz.
System, which occurs, for the Terahertz of above-mentioned unidirectional carrier transport photodetector includes picosecond pulse laser, transmission mould Block, beam splitter, amplitude modulation(PAM) module, unidirectional carrier transport photodetector and terahertz detection device.Picopulse swashs Light device launches the pulse laser of the higher psec two-stage of repetition rate, is transmitted through transport module and can realize picosecond pulse laser Spectrum widening, to obtain pulsewidth as tens of to hundreds of left and right femtoseconds.Then inputted after being modulated through amplitude modulation(PAM) module to unidirectional Carrier transport photodetector, because unidirectional carrier transport photodetector can realize big light intensity, high rate data transmission characteristic, High power, the terahertz pulse signal of high-speed can be inspired, so as to realize high power, the terahertz pulse signal of high-speed Communication.
Brief description of the drawings
The index path of system occurs for the Terahertz based on unidirectional carrier transport photodetector for Fig. 1.
Marked in figure:Picosecond pulse laser 1, erbium-doped fiber amplifier 2, highly nonlinear optical fiber 3-1, single-mode fiber 3-2, fiber coupler 4, the first amplitude modulator 5-1, the second amplitude modulator 5-2, unidirectional carrier transport photodetection Device 6, optical delay wire module 7-1, photoconductive antenna 7-2.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing Give presently preferred embodiments of the present invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough Comprehensively.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool The purpose of the embodiment of body, it is not intended that the limitation present invention.Term as used herein "and/or" includes one or more correlations Listed Items arbitrary and all combination.
As shown in Figure 1 the index path of system occurs for the Terahertz based on unidirectional carrier transport photodetector;Base Occurring system in the Terahertz of unidirectional carrier transport photodetector includes picosecond pulse laser 1, transport module 3, beam splitting Device 4, amplitude modulation(PAM) module 5, unidirectional carrier transport photodetector 6 and terahertz detection device 7.Picosecond pulse laser 1 launches the pulse laser of the higher psec two-stage of repetition rate, is transmitted through transport module 3 and can realize picosecond pulse laser Spectrum widening, to obtain pulsewidth as tens of to hundreds of left and right femtoseconds.Then inputted after being modulated through amplitude modulation(PAM) module 5 to unidirectional load Stream transmission photodetector 6, because unidirectional carrier transport photodetector 6 can realize big light intensity, high rate data transmission characteristic, High power, the terahertz pulse signal of high-speed can be inspired, so as to realize high power, the terahertz pulse signal of high-speed Communication.Meanwhile, terahertz detection device 7 can also be detected to the terahertz pulse signal given off.
Picosecond pulse laser 1, for launching picosecond pulse laser.Picosecond pulse laser 1 is that a pulsewidth is psec Laser.With picosecond ultrashort pulsewidth, repetition rate is adjustable, pulse energy is high the features such as.In one embodiment, psec arteries and veins The repetition rate for rushing laser 1 is more than or equal to 10GHz, and its pulse width is about 1.5 psecs (ps).
In one embodiment, system, which occurs, for the Terahertz based on unidirectional carrier transport photodetector 6 also includes er-doped Fiber amplifier (Erbium Doped Fiber Application Amplifier, EDFA) 2, the erbium-doped fiber amplifier 2 are arranged between the picosecond pulse laser 1 and transport module 3, for being amplified processing to picosecond pulse laser.For For the picosecond pulse laser of input, in the case where pulse width is certain, it is clear that its peak power is higher, then effect is composed in exhibition Good, pulse can improve its peak power by the amplification of erbium-doped fiber amplifier 2.
In other embodiments, can also with fiber Raman amplifier (Optical Fiber Raman Amplifier, OFRA) there is provided the peak power of its picosecond pulse laser for amplification of the realization to pulse laser.
Transport module 3, for transmitting the picosecond pulse laser and realizing the broadening of the picosecond pulse laser.It is described to pass Defeated module 3 includes highly nonlinear optical fiber (High Nonlinear Fiber, HNLF) 3-1, and the highly nonlinear optical fiber 3-1 is used for Transmission picosecond pulse laser simultaneously enters line broadening to the picosecond pulse laser.Only need to less pumping light power and shorter height Nonlinear optical fiber 3-1 can just reach efficient nonlinear interaction effect, by improving the super continuous of highly nonlinear optical fiber 3-1 Compose the generation efficiency of (Supercontinuum, SC), you can realize pulse spectrum broadening.
The transport module 3 also includes single-mode fiber (Single Mode Fiber, SMB) 3-2, the single-mode fiber 3-2 It is connected with the highly nonlinear optical fiber 3-2, the picosecond pulse laser that the single-mode fiber 3-2 is handled the broadening carries out dispersion Compensation.
Highly nonlinear optical fiber 3-1 of the picosecond pulse laser through too high normal dispersion amplified through erbium-doped fiber amplifier 2, is obtained To the linear positive chirp SC pulses of spectrum widening, then the standard single-mode fiber 3-2 Jing Guo corresponding length carries out chirp compensation pressure Contracting, to improve the peak power of pulse again, while dispersion compensation can also be carried out, it is tens of to several to be so obtained with pulsewidth Hundred or so femtoseconds, repetition rate is up to more than 10GHz picosecond pulse laser, realizes spectrum widening.
In the present embodiment, in the Terahertz generation system based on unidirectional carrier transport photodetector 6, its beam splitter 4th, it may also set up Gao Fei between amplitude modulation(PAM) module 5, unidirectional carrier transport photodetector 6 and terahertz detection device 7 Linear optical fiber 3-1 is transmitted to picosecond pulse laser, can be substantially reduced the size of transmission space, with miniaturization, meanwhile, It is easily installed and debugs.
Beam splitter 4, for the picosecond pulse laser of broadening to be divided into pump light and detection light.In one embodiment, beam splitting Device 4 is fiber coupler (Splitter) 4, and the input of the fiber coupler 4 is connected with the single-mode fiber 3-2, described First output end of fiber coupler 4 is used to export the pump light, and the second output end of the fiber coupler 4 is used to export The detection light.
In other are embodiment, its described beam splitter 4 can also be beam splitter.The selection of specific beam splitter 4 can root Factually the demand on border is set.
Amplitude modulation(PAM) module 5 receives the pump light and detection light respectively, for carrying out switching signal to the pump light Modulate and light intensity modulation is carried out to the detection light.The amplitude modulation(PAM) module 5 includes the first amplitude modulator (Amplitude Modulation, AM) 5-1 and the second amplitude modulator 5-2.First amplitude modulator 5-1 and the second amplitude are adjusted Device 5-2 processed and picosecond pulse laser time synchronized.
The first amplitude modulator 5-1 is arranged on the direction of propagation of the pump light, is modulated and is believed for loaded switches Number, also referred to as on-off keying signal (On Off Keying, OOK).Namely the amplitude of pump light is with digital baseband signal The digital modulation that (digital baseband signal is binary system) changes, it is that pumping light wave is controlled with unipolarity NRZ sequence Open and close.
Inputted from the first amplitude modulator 5-1 picosecond pulse lasers exported to unidirectional carrier transport photodetector 6 (Uni Traveling Carrier Photo-detector, UTC-PD, it is configured in unidirectional carrier transport photodetector 6 rearmounted antenna, you can radiation terahertz pulse signal.Because unidirectional carrier transport photodetector 6 has higher sound Response, can realize the high-speed output of big intensity incident light and high current, that is, detects light and visited in unidirectional carrier transport photoelectricity High power, the terahertz pulse signal of high-speed can be inspired by surveying transmission in device 6.
To avoid due to the excessive device damaged in terahertz detection module of the power of picosecond pulse laser, visited described The direction of propagation of light-metering is provided with the second amplitude modulator 5-2.Second amplitude modulator 5-2 is used to enter the detection light Row light intensity is modulated.The pulse recurrence frequency of end of probe can be reduced several orders of magnitude by the second amplitude modulator 5-2, to subtract The power of small end of probe.
Detection light after the second amplitude modulator 5-2 modulation enters terahertz detection device 7, while giving off too Hertz pulse signal is also delivered to terahertz detection device 7, and then the terahertz pulse signal of radiation is detected.
In one embodiment, the terahertz detection device 7 includes optical delay wire module 7-1 and photoconductive antenna (Photoconductive Antenna, PCA) 7-2, the optical delay wire module 7-1 are used to adjust the pump light and spy The time delay of light-metering, the photoconductive antenna 7-2 is used to detect the terahertz pulse signal.
In another embodiment, the terahertz detection device includes optical delay wire module and envelope detector, described Prolong the time delay that the slow wire module of optics is used to adjust the pump light and detection light, the envelope detector is used to detect described Terahertz pulse signal.Wherein, envelope detector is the big bandwidth envelope wave detector of linear/non-linear.Of course, it is possible to can basis Actual application scenarios select suitable detector for example:The big bandwidth envelope wave detector or photoconductive antenna of linear/non-linear, But not limited to this.
Occur system by the above-mentioned Terahertz based on unidirectional carrier transport photodetector 6, utilize high-repetition-rate Picopulse generating means produces more than 10GHz pulse, while utilizing one-way transmission carrier photodiode (UTC-PD) Ensure the power of terahertz sources, realize the terahertz pulse communication of high-speed.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (9)

1. system occurs for a kind of Terahertz based on unidirectional carrier transport photodetector, it is characterised in that including:
Picosecond pulse laser, for launching picosecond pulse laser, the repetition rate of the picosecond pulse laser is more than or equal to 10GHz;
Transport module, for transmitting the picosecond pulse laser and realizing the broadening of the picosecond pulse laser;
Beam splitter, for the picosecond pulse laser of broadening to be divided into pump light and detection light;
Amplitude modulation(PAM) module, switching signal tune is carried out for receiving the pump light and detection light respectively, and to the pump light Make, light intensity modulation is carried out to the detection light;
On unidirectional carrier transport photodetector, the direction of propagation for being arranged on the pump light, for exciting the pump light And terahertz pulse signal is given off, and ensure the power of the terahertz pulse signal transmitting;
Terahertz detection device, for receiving the detection light and being detected to the terahertz pulse signal.
2. system, its feature occur for the Terahertz according to claim 1 based on unidirectional carrier transport photodetector It is, the transport module includes highly nonlinear optical fiber, the highly nonlinear optical fiber is used to transmit picosecond pulse laser and to institute State picosecond pulse laser and enter line broadening.
3. system, its feature occur for the Terahertz according to claim 2 based on unidirectional carrier transport photodetector It is, the transport module also includes single-mode fiber, the single-mode fiber is connected with the highly nonlinear optical fiber, the single-mode optics The fine picosecond pulse laser to broadening processing carries out dispersion compensation.
4. system, its feature occur for the Terahertz according to claim 1 based on unidirectional carrier transport photodetector It is, the amplitude modulation(PAM) module includes the first amplitude modulator and the second amplitude modulator, first amplitude modulator is set Put on the direction of propagation of the pump light, for loaded switches modulated signal;
Second amplitude modulator is arranged on the direction of propagation of the detection light, strong for carrying out light intensity to the detection light Degree modulation.
5. system, its feature occur for the Terahertz according to claim 1 based on unidirectional carrier transport photodetector It is, the terahertz detection device includes optical delay wire module and photoconductive antenna, the optical delay wire module is used for The time delay of the pump light and detection light is adjusted, the photoconductive antenna is used to detect the terahertz pulse signal.
6. system, its feature occur for the Terahertz according to claim 1 based on unidirectional carrier transport photodetector It is, the terahertz detection device includes optical delay wire module and envelope detector, the slow wire module of optics that prolongs is used for The time delay of the pump light and detection light is adjusted, the envelope detector is used to detect the terahertz pulse signal.
7. system, its feature occur for the Terahertz according to claim 1 based on unidirectional carrier transport photodetector It is, in addition to erbium-doped fiber amplifier, the erbium-doped fiber amplifier is arranged on the picosecond pulse laser and transmission mould Between block, for being amplified processing to picosecond pulse laser.
8. system, its feature occur for the Terahertz according to claim 3 based on unidirectional carrier transport photodetector It is, the beam splitter is fiber coupler, the input of the fiber coupler is connected with the single-mode fiber, the optical fiber First output end of coupler is used to export the pump light, and the second output end of the fiber coupler is used to export the spy Light-metering.
9. system, its feature occur for the Terahertz according to claim 1 based on unidirectional carrier transport photodetector It is, the beam splitter is beam splitter.
CN201610912891.7A 2016-10-18 2016-10-18 System occurs for the Terahertz based on unidirectional carrier transport photodetector Active CN106299978B (en)

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CN201610912891.7A CN106299978B (en) 2016-10-18 2016-10-18 System occurs for the Terahertz based on unidirectional carrier transport photodetector
PCT/CN2017/106256 WO2018072661A1 (en) 2016-10-18 2017-10-16 Terahertz generation system based on unidirectional carrier transmission photodetector
JP2018524759A JP6635620B2 (en) 2016-10-18 2017-10-16 Terahertz generation system, terahertz generation device, and terahertz detection device based on single traveling carrier photodetector

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