CN208458884U - A kind of polarization of all -fiber is without shutting conversion single-photon detector - Google Patents
A kind of polarization of all -fiber is without shutting conversion single-photon detector Download PDFInfo
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- CN208458884U CN208458884U CN201820571551.7U CN201820571551U CN208458884U CN 208458884 U CN208458884 U CN 208458884U CN 201820571551 U CN201820571551 U CN 201820571551U CN 208458884 U CN208458884 U CN 208458884U
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- 230000010287 polarization Effects 0.000 title claims abstract description 73
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 42
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- 239000013307 optical fiber Substances 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 15
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- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 238000004891 communication Methods 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 238000005086 pumping Methods 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to the polarizations of all -fiber without shutting conversion single-photon detector, signal light is wherein divided into two linearly polarized lights using polarization beam-splitting unit, and the upper conversion process of signal light and pump light is realized using the combination of wavelength-division multiplex unit and frequency upooaversion unit or by the frequency upooaversion module being integrated to form by optical waveguide components and periodically poled lithium niobate waveguide, it is finally realized by optical-fiber bundling unit and the conjunction beam of frequency light is to be used for single photon detection, make it possible to realize in the form of all -fiber by this composition and polarizes unrelated upper conversion single-photon detector, make the light channel structure of detector simple simultaneously, stability is high and has high detection efficient and low power consumption.
Description
Technical field
The utility model relates to quantum communications fields, relate more specifically to the unrelated single-photon detector of polarization of all -fiber.
Background technique
Quantum secret communication has major application meaning, at present quantum secure in national defence, public safety and economic life
Communication limits its development there are many more technical bottleneck in practical applications, and the single-photon detecting survey technology of one of them communication band is not
Perfection limits the transmission range of quantum communications and at code rate, the single-photon detector of the communications field mainly has three classes at present: super
Lead detector, indium gallium arsenic avalanche photodide single-photon detector and upper conversion single-photon detector.Superconductor detector needs
Work is bulky under liquid helium temperature, at high cost to be unfavorable for extensive commercialization；Indium gallium arsenic avalanche photodide single photon
Detector is imperfect due to its material and technology, and detector efficiency can only achieve 10% or so, and its dark counting compares
It is high；Upper conversion single-photon detector is the frequency conversion type functionization single photon detection based on periodically poled lithium niobate waveguide device
Device has many advantages, such as that detection efficient high (being greater than 20%), dark counting is low and is not necessarily to refrigerant.
Upper conversion detector is to carry out period polarized realization using lithium niobate waveguides using nonlinear optics and frequency process
Quasi-phase matched will be converted into visible light single photon on communication band single photon, recycle avalanche silicon diode single-photon detecting
Survey device detection.Avalanche silicon diode single-photon detector has detection efficient high (70%), dark to visible light wave range single photon signal
Count low (< 100 Hz) and the advantages such as afterpulse probability is low, and by frequency conversion, the silicon detector of high-quality may be used for
Communication band single photon detection.Upper conversion detector, which has, to be not required to refrigerant, can integrate, the advantages such as quantum efficiency height.
Fig. 1 shows a kind of schematic diagram of commercial upper conversion single-photon detector.As shown, pump light source is defeated
The single-frequency continuous laser of 1.95um out, signal light are the single-photon source of near-infrared, are all made of polarization maintaining optical fibre input or output.Period
Poled lithium niobate (PPLN) waveguide needs to carry out temperature control, under the conditions of meeting quasi-phase matched, signal light and pump light hair
Raw and frequency is converted to the optical signal of visible light wave range after acting on, so may be implemented near infrared light signal to visible light wave range
Efficiently " carry ".Visible light wave range signal light passes through a series of filtering device again and filters out various noises, then accesses silicon detection
Device is detected.
Existing upper conversion single-photon detector is in actual use, very strict to detected signal light requirement,
Ask signal light input must be vertical polarization linearly polarized light, polarization contrast is greater than 20dB, and polarization state must be kept not
Become.This is because the frequency conversion based on periodically poled lithium niobate waveguide be polarization it is relevant, non-perpendicular linearly polarized light or
Person's polarization state variation signal light be linked into the detector system, will lead to conversion detector detection efficient reduce and not
Controllably.Polarization requirement of the upper conversion single-photon detector to input signal light, greatly limits conversion detector
Use scope, be unfavorable for the extensive commercialization of upper conversion detector.
In the prior art, in order to overcome influence of the signal polarization state to upper conversion single-photon detector working efficiency,
Have devised the upper conversion single-photon detector structure unrelated with polarization.
Fig. 2 shows a kind of polarizations in the prior art without conversion single-photon detector structure is shut, wherein introducing polarization
Signal light is divided into two-way polarised light by beam splitter, recycles two pieces of PPLN waveguides, two sets of filtering systems, two silicon detectors to two
Road polarization signal light separately detects.This structure causes to exist and uses device mistake due to needing two to put on transition detection device assembly
More, the disadvantages of structure is complicated and cost is excessively high.
The panel detector structure shown in Fig. 2 there are aiming at the problem that, propose in the prior art it is another polarize it is unrelated upper turn
Single-photon detector structure is changed, as shown in figure 3, the detector will have more simplified structure and higher detection efficient.?
Improved polarization shown in Fig. 3 carries out signal light without shutting in conversion single-photon detector, also with polarization beam apparatus
Polarization beam splitting, then signal light wherein all the way, which is done polarization and adjusted, keeps it consistent with another way polarization direction, then two-way phase
With polarization state signal light and pump light synthesized using space optical path it is a branch of, using Lens Coupling into carrying out in lithium niobate waveguides
Frequency upooaversion, and then complete single photon detection.However, the program is based entirely on free space optical path, and its two paths of signals
The conjunction beam of the polarised light of light is to enter waveguide front-ends completion, and system building is complicated and stability is poor, is not suitable for commercialization.
Utility model content
For the problems such as stability existing in the prior art is poor, structure is complicated, at high cost, a side of the utility model
Face discloses a kind of complete optical fiber polarization without conversion single-photon detector is shut, and may include pump light source, beam splitting unit, wavelength-division
Multiplexing Unit, frequency upooaversion unit, optical-fiber bundling unit and probe unit.Wherein, the beam splitting unit is for making signal light
The first linearly polarized light and the second linearly polarized light are separated, first and second linearly polarized light has different polarization directions；It is described
Pump light source has the frequency different from the signal light for providing pump light；The wavelength-division multiplex unit is for making institute
The first linearly polarized light and second linearly polarized light are stated respectively with the pumping combiner, are closed with forming the first combined beam light and second
Shu Guang；The frequency upooaversion unit is used to make first linearly polarized light in first combined beam light and pump light and institute
Second linearly polarized light and pump light stated in the second combined beam light are respectively completed frequency upooaversion, to form first and frequency light
With second and frequency light；The optical-fiber bundling unit for make described first and frequency light and described second and frequency light carry out conjunction beam, with
Form third combined beam light；The probe unit is used to carry out single photon detection to the third combined beam light；And the pump light
Source, the beam splitting unit, the wavelength-division multiplex unit, the frequency upooaversion unit, the optical-fiber bundling unit and the spy
The optical path connection surveyed between unit is realized by optical fiber.
Preferably, the beam splitting unit can use polarization beam apparatus.
Preferably, the wavelength-division multiplex unit may include two wavelength division multiplexers.
Preferably, the frequency upooaversion unit can be the waveguide of binary channels periodically poled lithium niobate.
Preferably, the optical-fiber bundling unit can be multimode fibre bundling device.
Preferably, the detector of the utility model can also include filter, be used to be filtered to frequency light.
It should be readily apparent to one skilled in the art that herein and frequency light either first and frequency light and/or second and frequency light, are also possible to
First and frequency light and second and frequency combiner formed third combined beam light.
The another aspect of the utility model also discloses that a kind of complete optical fiber polarization, can without conversion single-photon detector is shut
To include pump light source, beam splitting unit, frequency upooaversion module, optical-fiber bundling unit and probe unit.Wherein, the beam splitting list
For making signal light separate the first linearly polarized light and the second linearly polarized light, first and second linearly polarized light has different member
Polarization direction；The pump light source has the frequency different from the signal light for providing pump light；Turn in the frequency
Block tool is changed the mold there are four input port and two output ports, wherein to receive the First Line respectively inclined for four input ports
Pump light described in vibration light, second linearly polarized light and two-way, and the frequency upooaversion module is configured to make described first
The frequency upooaversion of the completion all the way process of linearly polarized light and the pump light is to form first and frequency light, and makes second line
The another way of polarised light and the pump light completes frequency upooaversion process to form second and frequency light；The optical-fiber bundling unit
For make described first and frequency light and described second and frequency light carry out conjunction beam, to form combined beam light；The probe unit for pair
The combined beam light carries out single photon detection；And the pump light source, the beam splitting unit, the frequency upooaversion module, institute
The optical path connection stated between optical-fiber bundling unit and the probe unit is realized by optical fiber.
Preferably, the frequency upooaversion module may include mode filter, the first tapered transmission line, directional coupler,
Second tapered transmission line and binary channels periodically poled lithium niobate waveguide.Further, the frequency upooaversion module can also include
Waveguide bend.
Preferably, the beam splitting unit can use polarization beam apparatus.
Preferably, the optical-fiber bundling unit can be multimode fibre bundling device.
Preferably, the detector of the utility model can also include filter, be used to be filtered to frequency light.
Similarly, herein and frequency light either first and frequency light and/or second and frequency light, are also possible to first and frequency light and second
The combined beam light formed with frequency combiner.
Detailed description of the invention
Fig. 1, which is shown, converts single-photon detector in one kind of the prior art；
A kind of Fig. 2 shows the prior art polarizes unrelated upper conversion single-photon detector；
The another kind that Fig. 3 shows the prior art polarizes unrelated upper conversion single-photon detector；
Fig. 4 shows the complete optical fiber polarization of the utility model without a kind of exemplary implementation for shutting conversion single-photon detector
Example；And
Fig. 5 shows the complete optical fiber polarization of the utility model without another preferred implementation for shutting conversion single-photon detector
Example.
Specific embodiment
Hereinafter, the exemplary embodiment of the utility model is with reference to the accompanying drawings to detailed description.The following examples with
Example way provides, sufficiently to convey the spirit of the utility model to give the utility model those skilled in the art.Cause
This, the utility model is not limited to embodiment disclosed herein.
It is exemplary without the one kind for shutting conversion single-photon detector that Fig. 4 shows complete optical fiber polarization according to the present utility model
Embodiment.As shown, the single-photon detector 1 is including in pump light source, beam splitting unit 11, wavelength-division multiplex unit 12, frequency
Converting unit 13, optical-fiber bundling unit 14 and probe unit 15.
As known to those skilled in the art, signal light can be, for example, the single-photon source of near-infrared.
Beam splitting unit 11 is for making signal light separate the first linearly polarized light and the second linearly polarized light, wherein first and second
Linearly polarized light has perpendicular polarization direction, such as can be respectively orthogonal polarized light and horizontal polarization light.As one
Preferable example, beam splitting unit 11 can realize by polarization beam apparatus (PBS), but not limited to this.
Pump light source provide pump light, with the frequency different from signal light with signal light realize frequency upper turn
It changes.As a preferable example, pump light source can be the continuous wave laser that wavelength is 1.95 μm.
Wavelength-division multiplex unit 12 for make the first linearly polarized light and the second linearly polarized light respectively with pumping combiner, with corresponding
Form the first combined beam light and the second combined beam light.As a preferable example, wavelength-division multiplex unit 12 may include first and second
Wavelength division multiplexer (WDM), to be respectively used to make the first linearly polarized light and the second linearly polarized light and respective pump light to form first
With the second combined beam light.
Frequency upooaversion unit 13 is used to make First Line polarization signal light and its pump light and second in the first combined beam light
The second linear polarization signal light and its pump light in combined beam light are respectively completed the upper conversion of frequency, so that being formed has higher frequency
First and frequency light and second and frequency light.As a preferable example, frequency upooaversion unit 13 can be binary channels period pole
Change lithium niobate waveguides (PPLN WG).
Optical-fiber bundling unit 14 for make first and frequency light and second and frequency light carry out conjunction beam, along same transmission path row
Into.As a preferable example, optical-fiber bundling unit 14 can use multimode fibre bundling device (MMFC).
Probe unit 15 be used for include first and frequency light and second and frequency light combined beam light carry out single photon detection, thus
It is provided with the detection result of OFF signal light.As a preferable example, probe unit 15 can be efficient silicon single-photon detecting
Survey device.
So far, it should be readily apparent to one skilled in the art that in the single-photon detector 1, due to being by above-mentioned function list
First 11-14 realizes the upper conversion process of signal light, so that each function in detector 1 can be realized conveniently by optical fiber
Optical path connection between energy unit, to form a kind of single-photon detector of all -fiber.As a preferable example, such as Fig. 4
Shown, in detector 1, signal light can connect beam splitting unit 11 by single mode optical fiber (SMF)；Pump light source can pass through guarantor
Polarisation fibre (PMF) connects wavelength-division multiplex unit 12；Between beam splitting unit 11, wavelength-division multiplex unit 12 and frequency upooaversion unit 13
Connection optical path can be realized by polarization maintaining optical fibre；Also, frequency upooaversion unit 13, optical-fiber bundling unit 14 and probe unit
Connection optical path can be provided by multimode fibre (MMF) between 15.
The polarization of the utility model comes without conversion single-photon detector is shut below in conjunction with Fig. 4 in order to better understand
The working principle of detector 1 is elaborated.
As shown, signal light is divided into the orthogonal linear polarization of two beams after single mode optical fiber input polarization beam splitter 11
Light, for example, horizontal polarization the first linearly polarized light (as shown in the double arrowed line in Fig. 4) and vertical polarization the second linearly polarized light
(as shown in the line of dots in Fig. 4), the first and second linearly polarized lights then along polarization maintaining optical fibre slow axis to wavelength-division multiplex unit
12 transmission.The single-frequency continuous laser that pump light source output two-way wavelength is 1.95um is used as pump light, and two-way pump light is logical
Cross two wavelength division multiplexers transmission that polarization maintaining optical fibre is respectively facing in wavelength-division multiplex unit 12.In wavelength division multiplexer, linear polarization
In signal light all the way with the combined beam light all the way of the formation all the way in pump light, in the another way and pump light in linear polarization signal light
Another way formed another way combined beam light.The period polarized niobic acid of binary channels is entered by polarization maintaining optical fibre all the way in two-way combined beam light
One channel of lithium waveguide 13 and the upper conversion process for completing frequency, another way combined beam light equally pass through polarization maintaining optical fibre and enter bilateral
Another channel of road periodically poled lithium niobate waveguide 13 and the upper conversion process for completing frequency, to form two-way through in frequency
Convert and frequency light.Two-way and frequency light transmit towards multimode fibre bundling device 14 through multimode fibre and carry out conjunction beam in it.Most
Afterwards, economic cooperation beam and frequency light via multimode fibre towards High-efficiency silicon single-photon detector transmit and by its carry out single-photon detecting
It surveys.
Based on the description above for the upper working principle for converting single-photon detector 1 it is found that in detector 1, due to
It is that signal light is divided into polarization direction two-way linear polarization different from each other using polarization beam-splitting unit in signal light receiving light path
Light recycles a twin-channel PPLN waveguide directly to carry out frequency upooaversion to this two-way linearly polarized light and its pump light to produce
Raw two-way and frequency light, finally carry out conjunction beam for two-way and frequency light using multimode fibre bundling device, therefore can well solve
The single-photon detector problem Polarization-Sensitive to signal light is converted, the upper conversion single photon detection unrelated with polarization is provided.Meanwhile
Since the entire optical path that the setting of each functional unit in detector makes it possible to detect from signal light entrance to probe unit is complete
Portion is realized using optical fibre device, is simply easily achieved so that the optical path of detector is built, high reliablity, is convenient for commercialization, very
Solving the prior art well can only realize either to come in fact by the combination of optical fibre device and free space in free space
The problem of existing detector optical path, solves the instability problem as caused by free space optical path in the prior art.In addition,
Multimode fibre bundling device is used in the utility model can improve detector by its feature with filter with low insertion loss well
Detection efficient.
Further, in order to improve the signal-to-noise ratio of detector, filter 16 can also be set in detector, for and frequency
Light is filtered to remove system noise acousto-optic.As shown, filter 16 can be set in optical-fiber bundling unit 14 and visit
It surveys between unit 15, but it should be readily apparent to one skilled in the art that filter 16 also can be set in frequency upooaversion unit 13
Between optical-fiber bundling unit 14.Optical-fiber bundling unit 14, filter 16 and probe unit 15 or frequency upooaversion unit 13
Between again may be by multimode fibre provide optical path connection.
Based on the principles of the present invention, Fig. 5 shows the complete optical fiber polarization of the utility model without shutting conversion single photon
Another preferred embodiment of detector.As shown, single-photon detector 2 may include pump light source, beam splitting unit 21, frequency
Upper conversion module 23, optical-fiber bundling unit 24 and probe unit 25.In this embodiment, pump light source, beam splitting unit 21, optical fiber
Combined beam unit 24 and probe unit 25 can have and pump light source, beam splitting unit 11, optical-fiber bundling unit 14 and the spy in Fig. 4
Survey the identical setting of unit 15, for purposes of brevity, identical content that details are not described herein.
In this embodiment, exist to better solve the polarization of the prior art without shutting in conversion single-photon detector
System building it is complicated, stability is poor, is not suitable for the problems such as commercialization, other than using the optical path similar with Fig. 4 and configuring,
Also introduce modular frequency upooaversion module 23.Specifically, inventor innovatively propose it is period polarized with binary channels
Based on lithium niobate waveguides, along the optical transmission direction in detector 1 successively in the defeated of binary channels periodically poled lithium niobate waveguide
Enter and integrates the optical waveguide components such as mode filter, the first tapered transmission line, directional coupler and the second tapered transmission line on end, with
The frequency upooaversion module 23 in Fig. 5 is formed, two-route wire polarization signal light and two-way pump light and complete can be directly received
At two-way frequency upooaversion process, to omit the use and associated optical fiber connection of the wavelength-division multiplex unit in Fig. 4
Setting, thus provides the single-photon detector that a kind of light channel structure is more simple, stability is stronger, is more suitable for commercialization demand.
In addition, the insertion loss brought by wavelength division multiplexer can also be avoided by frequency upooaversion module 23, to further increase
The detection efficient of detector reduces required pumping light power.Further, in order to facilitate mode filter, the first conical wave
It leads, the layout setting of the optical waveguide components in frequency upooaversion module 23 such as directional coupler and the second tapered transmission line, it can be with
Waveguide bend is introduced in frequency upooaversion module 23.
By front to the description of frequency upooaversion module 23 it is found that the frequency upooaversion module 23 in Fig. 5 can have
Four input ports and two output ports, wherein four input ports are respectively used to receive two-way pump light and by beam splitting unit
The 21 two-route wire polarization signal light separated.Two-route wire polarization signal light and two-way pump light are via mode filter, the first taper
Waveguide, waveguide bend, directional coupler and the second tapered transmission line are finally respectively enterd in the form of pump light and signal combiner double
Two channels of channel period poled lithium niobate waveguide, to realize frequency upooaversion process, and eventually by two output ports
Output two-way and frequency light outward.Preferably, for facilitating setting and commercialization etc. to consider, frequency upooaversion module 23 be may be implemented
For the form of chip.
Similarly, for the purpose being best understood from, the work of single-photon detector 2 is illustrated below in conjunction with Fig. 5
Principle.
As shown, signal light is divided into the orthogonal linear polarization of two beams after single mode optical fiber input polarization beam splitter 21
Light, for example, horizontal polarization the first linearly polarized light (as shown in the double arrowed line in Fig. 5) and vertical polarization the second linearly polarized light
(as shown in the line of dots in Fig. 5), the first and second linearly polarized lights then along polarization maintaining optical fibre slow axis to frequency upooaversion mould
Block 23 transmits.The single-frequency continuous laser that pump light source output two-way wavelength is 1.95um is used as pump light, two-way pump light
It is transmitted by polarization maintaining optical fibre towards frequency upooaversion module 23.In frequency upooaversion module 23, two-way pump light and two-route wire
Polarization signal light completes frequency upooaversion process, and forms two-way and frequency light.Two-way and frequency light are through multimode fibre towards multimode light
Fine bundling device 24 transmits and carries out conjunction beam in it.Finally, economic cooperation beam and frequency light via multimode fibre towards High-efficiency silicon list
The transmission of photon detector 25 simultaneously carries out single photon detection by it.
As previously mentioned, the described polarization of Fig. 5 is borrowed without conversion single-photon detector is shut compared to embodiment illustrated in fig. 4
It helps frequency upooaversion module 23 that can also be further simplified detector light channel structure, improves stability and detection efficient, reduce function
Consumption, to be more advantageous to the implementation of commercialization, better solved existing polarization without shut convert in single-photon detector due to
A series of problems caused by free space.
Similarly, in order to further improve the signal-to-noise ratio of detector 2, filter can be equally set in single-photon detector 2
Wave device 26, for being filtered to frequency light, to remove system noise acousto-optic.The setting position of filter 26 and filter 16
It is similar, therefore also repeat no more herein.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (12)
1. a kind of complete optical fiber polarization is without shutting conversion single-photon detector comprising pump light source, beam splitting unit (11), wavelength-division are multiple
With unit (12), frequency upooaversion unit (13), optical-fiber bundling unit (14) and probe unit (15), in which:
The beam splitting unit (11) is for making signal light separate the first linearly polarized light and the second linearly polarized light, and described first and second
Linearly polarized light has different polarization directions；
The pump light source has the frequency different from the signal light for providing pump light；
The wavelength-division multiplex unit (12) for make first linearly polarized light and second linearly polarized light respectively with the pump
Pu combiner, to form the first combined beam light and the second combined beam light；
The frequency upooaversion unit (13) be used to making first linearly polarized light in first combined beam light and pump light with
And second linearly polarized light in second combined beam light and pump light are respectively completed frequency upooaversion, to form the first He
Frequency light and second and frequency light；
The optical-fiber bundling unit (14) for make described first and frequency light and described second and frequency light carry out conjunction beam, to form the
Three combined beam lights；
The probe unit (15) is used to carry out single photon detection to the third combined beam light；And
The pump light source, the beam splitting unit (11), the wavelength-division multiplex unit (12), the frequency upooaversion unit
(13), the optical path connection between the optical-fiber bundling unit (14) and the probe unit (15) is realized by optical fiber.
2. single-photon detector as described in claim 1, wherein the beam splitting unit (11) is polarization beam apparatus.
3. single-photon detector as described in claim 1, wherein the wavelength-division multiplex unit (12) includes two wavelength-division multiplex
Device.
4. single-photon detector as described in claim 1, wherein the frequency upooaversion unit (13) is binary channels period pole
Change lithium niobate waveguides.
5. single-photon detector as described in claim 1, wherein the optical-fiber bundling unit (14) is that multimode fibre closes beam
Device.
6. single-photon detector as described in claim 1 further includes filter (16), for being filtered to described and frequency light
Wave processing.
7. a kind of complete optical fiber polarization is without shutting conversion single-photon detector comprising pump light source, beam splitting unit (21), in frequency
Conversion module (23), optical-fiber bundling unit (24) and probe unit (25), in which:
The beam splitting unit (21) is for making signal light separate the first linearly polarized light and the second linearly polarized light, and described first and second
Linearly polarized light has different polarization directions；
The pump light source has the frequency different from the signal light for providing pump light；The frequency upooaversion mould
Block (23) tool is there are four input port and two output ports, wherein to receive the First Line respectively inclined for four input ports
Shake light, pump light described in second linearly polarized light and two-way, and the frequency upooaversion module (23) be configured to make it is described
The frequency upooaversion of the completion all the way process of first linearly polarized light and the pump light is to form first and frequency light, and makes described the
The another way of two linearly polarized lights and the pump light completes frequency upooaversion process to form second and frequency light；
The optical-fiber bundling unit (24) for make described first and frequency light and described second and frequency light carry out conjunction beam, with formed close
Shu Guang；
The probe unit (25) is used to carry out single photon detection to the combined beam light；And
The pump light source, the beam splitting unit (21), the frequency upooaversion module (23), the optical-fiber bundling unit (24)
Optical path connection between the probe unit (25) is realized by optical fiber.
8. single-photon detector as claimed in claim 7, wherein the frequency upooaversion module (23) includes mode filtering
Device, the first tapered transmission line, directional coupler, the second tapered transmission line and binary channels periodically poled lithium niobate waveguide.
9. single-photon detector as claimed in claim 8, wherein the frequency upooaversion module (23) further includes waveguide bend.
10. single-photon detector as claimed in claim 7, wherein the beam splitting unit (21) is polarization beam apparatus.
11. single-photon detector as claimed in claim 7, wherein the optical-fiber bundling unit (24) is that multimode fibre closes beam
Device.
12. single-photon detector as claimed in claim 7 further includes filter (26), for being carried out to described and frequency light
Filtering processing.
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| CN (1) | CN208458884U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388988A (en) * | 2018-04-20 | 2019-10-29 | 山东量子科学技术研究院有限公司 | A kind of polarization of all -fiber is without shutting conversion single-photon detector |
| CN112985596A (en) * | 2021-01-26 | 2021-06-18 | 济南量子技术研究院 | 10.6 mu m single photon detector based on frequency up-conversion and performance test experimental device thereof |
| CN114894306A (en) * | 2022-07-13 | 2022-08-12 | 济南量子技术研究院 | Up-conversion array camera and imaging method thereof |
-
2018
- 2018-04-20 CN CN201820571551.7U patent/CN208458884U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388988A (en) * | 2018-04-20 | 2019-10-29 | 山东量子科学技术研究院有限公司 | A kind of polarization of all -fiber is without shutting conversion single-photon detector |
| CN112985596A (en) * | 2021-01-26 | 2021-06-18 | 济南量子技术研究院 | 10.6 mu m single photon detector based on frequency up-conversion and performance test experimental device thereof |
| CN112985596B (en) * | 2021-01-26 | 2022-12-23 | 济南量子技术研究院 | 10.6 mu m single photon detector based on frequency up-conversion and performance test experimental device thereof |
| CN114894306A (en) * | 2022-07-13 | 2022-08-12 | 济南量子技术研究院 | Up-conversion array camera and imaging method thereof |
| CN114894306B (en) * | 2022-07-13 | 2022-09-13 | 济南量子技术研究院 | Up-conversion array camera and imaging method thereof |
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