CN206340819U - 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 PDFInfo
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- CN206340819U CN206340819U CN201621135376.4U CN201621135376U CN206340819U CN 206340819 U CN206340819 U CN 206340819U CN 201621135376 U CN201621135376 U CN 201621135376U CN 206340819 U CN206340819 U CN 206340819U
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Abstract
System occurs for the Terahertz that the utility model is related to a kind 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
Technical field
The utility model is related to Terahertz Technology field, more particularly to based on unidirectional carrier transport photodetector
System occurs for Terahertz.
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.
Utility model content
Based on this, it is necessary to regarding to the issue above there is provided 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 wherein one embodiment, 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 wherein one embodiment, 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 wherein one embodiment, 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 wherein one embodiment, 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 wherein one embodiment, 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 wherein one embodiment, also including 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 wherein one embodiment, 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 wherein one embodiment, the beam splitter is beam splitter.
In wherein one embodiment, 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 photodetector 6, light
Learn delay line module 7-1, photoconductive antenna 7-2.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.Preferred embodiment of the present utility model is given in accompanying drawing.But, the utility model can come real in many different forms
It is existing, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is made to public affairs of the present utility model
The understanding for opening content is more thorough comprehensive.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is herein to be in term used in the description of the present utility model
The purpose of description specific embodiment, it is not intended that limitation the utility model.Term as used herein "and/or" includes one
The arbitrary and all combination of individual or multiple related Listed Items.
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 several embodiments of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
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；
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 give off terahertz pulse signal；
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 that 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 that 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 that 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 that 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 that the terahertz detection device includes optical delay wire module and envelope detector, the optical delay wire module 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 that, also including 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 that 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 that the beam splitter is beam splitter.
10. system, its feature occur for the Terahertz according to claim 1 based on unidirectional carrier transport photodetector
It is that the repetition rate of the picosecond pulse laser is more than or equal to 10GHz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018072661A1 (en) * | 2016-10-18 | 2018-04-26 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz generation system based on unidirectional carrier transmission photodetector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018072661A1 (en) * | 2016-10-18 | 2018-04-26 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz generation system based on unidirectional carrier transmission photodetector |
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