CN2636213Y - High-amplitude signal output monophoton detector - Google Patents
High-amplitude signal output monophoton detector Download PDFInfo
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- CN2636213Y CN2636213Y CN 03230983 CN03230983U CN2636213Y CN 2636213 Y CN2636213 Y CN 2636213Y CN 03230983 CN03230983 CN 03230983 CN 03230983 U CN03230983 U CN 03230983U CN 2636213 Y CN2636213 Y CN 2636213Y
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- single photon
- current
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- photon detector
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Abstract
A single photon detector for outputting high amplitude signals is provided, which belongs to the confidential communication technological field. The shortcoming of the traditional single photon detector is that the amplitude of the avalanche signal of the output signals is too low (20mV to 30mV), which goes against the acquisition and processing of the output signals. The technological proposal of the utility model is that: a capacitance is led into the traditional single photon detector and bridge connected the both ends of a current-limiting resistance (1), thus, the amplitude of the output signals can reach about 120mV. The utility model has the advantages of simple structure, easy operation and high amplitude of the output signals, which is especially suitable for driving a comparator in the signal acquisition and processing circuit.
Description
Technical field
The utility model relates to a kind of single photon detector of exporting high amplitude signal, belongs to the quantum secret communication technical field.
Background technology
In quantum secret communication, information is transmitted by being carried on the single photon, and avalanche diode (APD) is the detection means of single photon, and the performance of single photon detector is the key of the indexs such as operating distance, error rate of decision quantum secret communication.Fig. 1 shows the circuit diagram of traditional single photon detector, and wherein 1 and 3 is respectively current-limiting resistance and output resistance, and the 4th, distributed capacitance, the 5th, direct supply, the 6th, socket, the 2nd, avalanche diode, i.e. single photon detector spare.Avalanche diode 2 is with reverse Geiger mode angular position digitizer, and promptly the output voltage of direct supply is greater than the avalanche voltage work of avalanche diode 2, and output signal picks out with socket 6 from the two ends of output resistance 3.The shortcoming of this single photon detector circuit is an output signal, and promptly the amplitude of the avalanche signal that photon detection produced too low (20-30mV) is unfavorable for the collection and the processing of output signal.
Summary of the invention
The technical problems to be solved in the utility model is to release a kind of single photon detector of exporting high amplitude signal.
The technical solution of the utility model is to introduce an electric capacity in traditional single photon detector, and this electric capacity is connected across the two ends of current-limiting resistance 1.
Now be described with reference to the accompanying drawings the technical solution of the utility model.A kind of single photon detector of exporting high amplitude signal, form by current-limiting resistance 1, output resistance 3, avalanche diode 2, distributed capacitance 4, direct supply 5 and socket 6, be connected across the two ends of direct supply 5 after current-limiting resistance 1, avalanche diode 2 and output resistance 3 series connection, an end of current-limiting resistance 1 and an end of output resistance 3 respectively with the V of direct supply 5
CcBe connected with ground wire, distributed capacitance 4 is connected across between the negative electrode and ground wire of avalanche diode 2, and the heart yearn of socket 6 is connected with the two ends of output resistance 3 respectively with shell, it is characterized in that it also comprises electric capacity 7, and electric capacity 7 is connected across the two ends of current-limiting resistance 1.
Of the present utility model being further characterized in that, the capacity of electric capacity 7 is between 0.3-5pf.
Principle of work: at ordinary times, no avalanche current in the avalanche diode 2, its terminal voltage is higher than avalanche voltage, is in the state of waiting for that photon arrives, and the terminal voltage of distributed capacitance 4 equals the output voltage V of direct supply 5
Cc, the terminal voltage of current-limiting resistance 1 is 0, and electric capacity 7 is uncharged, and the terminal voltage of electric capacity 7 is 0, and the output voltage of output resistance 3 also is 0, distributed capacitance 4 chargings.When a photon is injected avalanche diode 2, avalanche diode 2 is excited, snowslide takes place, produce bigger avalanche current, current-limiting resistance 1 two ends produce voltage drop, the terminal voltage of avalanche diode 2 is reduced to avalanche voltage, distributed capacitance 4 is by output resistance 3 discharges, and simultaneously, electric capacity 7 is by avalanche diode 2 and output resistance 3 chargings, the electric current of discharge and charging flows through output resistance 3 together, makes the high amplitude signal of output resistance 3 outputs.Elapsed time T
qAfter, the terminal voltage of electric capacity 4 drops to the avalanche voltage of avalanche diode 2, and the electric current of the avalanche diode 2 of flowing through is less than the threshold value of extinguishing of avalanche diode 2, and snowslide stops.Avalanche diode 2 ends, and electric capacity 7 is by current-limiting resistance 1 discharge, is 0 until the terminal voltage of electric capacity 7, and direct supply 5 makes distributed capacitance 4 chargings, elapsed time T by current-limiting resistance 1
rAfter, circuit has been got back to the state that initial wait photon arrives.Under such working method, the amplitude of output signal can reach about 120mV, is enough to the signals collecting of direct triggering following and the comparer in the treatment circuit.
Compare with background technology, the utility model has following beneficial effect:
1. simple in structure, easy to implement.
2. the amplitude height of output signal reaches about 120mV.
Description of drawings
The single photon detector circuit that Fig. 1 is traditional.
Fig. 2 exports the single photon detector circuit of high amplitude signal, wherein, the 1st, current-limiting resistance, the 2nd, avalanche diode, the 3rd, output resistance, the 4th, distributed capacitance, the 5th, direct supply, the 6th, socket, the 7th, electric capacity.
The oscillography figure of Fig. 3 tradition single photon detector output low amplitude value signal.
Fig. 4 the utility model single photon detector is exported the oscillography figure of high amplitude signal.
The dimension sketch of Fig. 5 the utility model single photon detector, wherein, the 8th, shell, the 9th, the circuit board of making by circuit shown in Fig. 2, the 20th, incident lens, the 21st, catoptron, the 22nd, semiconductor cooling device, the 6th, BNC type socket.Incident lens 20, catoptron 21 and semiconductor cooling device 22 are traditional and avalanche diode 2 matching used devices.The function of incident lens 20 and catoptron 21 is that the guiding incident photon is injected avalanche diode 2; The function of semiconductor cooling device 22 is to guarantee that avalanche diode 2 is operated in the low noise state.Incident lens 20, catoptron 21, semiconductor cooling device 22 are not contacted directly with the circuit structure that the utility model is inquired into, and therefore just deeply they are not inquired into here.
Specific embodiments
Present embodiment has the identical circuit of single photon detector with the above-mentioned high amplitude signal of output, and wherein: the resistance of current-limiting resistance 1 and output resistance 3 is respectively 300K and 500 Ω; Avalanche diode 2 is EG﹠amp; The C30902S-SPAD type Si avalanche diode that G company produces; The output voltage V of direct supply 5
CcBe 240V; Socket 6 is a BNC type socket; The capacity of cross-over connection electric capacity 7 is 1pf; Distributed capacitance 4 is estimated as 2-3pf, and the amplitude of output signal is about 120mV.
Present embodiment has the identical circuit of single photon detector with the above-mentioned high amplitude signal of output, and wherein: the resistance of current-limiting resistance 1 and output resistance 3 is respectively 220K and 300 Ω; Avalanche diode 2 is FPD13R31KS-SPAD type Ge avalanche diodes that Fujitsu company produces; The output voltage V of direct supply 5
CcBe 136V; Socket 6 is a BNC type socket; The capacity 5pf of cross-over connection electric capacity 7; Distributed capacitance 4 is estimated as 2-3pf, and the amplitude of output signal is about 120mV.
Embodiment 3
Present embodiment has the identical circuit of single photon detector with the above-mentioned high amplitude signal of output, and wherein: the resistance of current-limiting resistance 1 and output resistance 3 is respectively 200K and 1K Ω; Avalanche diode 2 is FPD5W1KS-SPAD type InGaAs avalanche diodes that Fujitsu company produces; The output voltage V of direct supply 5
CcBe 59V; Socket 6 is a BNC type socket; The capacity of cross-over connection electric capacity 7 is 3pf; Distributed capacitance 4 is estimated as 2-3pf, and the amplitude of output signal is about 120mV.
Claims (2)
- One kind output high amplitude signal single photon detector, by current-limiting resistance (1), output resistance (3), avalanche diode (2), distributed capacitance (4), direct supply (5) and socket (6) are formed, current-limiting resistance (1), be connected across the two ends of direct supply (5) after avalanche diode (2) and output resistance (3) series connection, one end of one end of current-limiting resistance (1) and output resistance (3) is connected with ground wire with the Vcc of direct supply (5) respectively, distributed capacitance (4) is connected across between the negative electrode and ground wire of avalanche diode (2), the heart yearn of socket (6) is connected with the two ends of output resistance (3) respectively with shell, it is characterized in that, it also comprises electric capacity (7), and electric capacity (7) is connected across the two ends of current-limiting resistance (1).
- 2. single photon detector according to claim 1 is characterized in that, the capacity of electric capacity (7) is in 0.3-5pf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03230983 CN2636213Y (en) | 2003-05-07 | 2003-05-07 | High-amplitude signal output monophoton detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03230983 CN2636213Y (en) | 2003-05-07 | 2003-05-07 | High-amplitude signal output monophoton detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2636213Y true CN2636213Y (en) | 2004-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03230983 Expired - Fee Related CN2636213Y (en) | 2003-05-07 | 2003-05-07 | High-amplitude signal output monophoton detector |
Country Status (1)
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| CN (1) | CN2636213Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980668A (en) * | 2012-11-22 | 2013-03-20 | 广东汉唐量子光电科技有限公司 | Bipolar bias single photon detection method |
| CN103728030A (en) * | 2013-12-20 | 2014-04-16 | 中国科学院合肥物质科学研究院 | Self-adaptive near-infrared single-photon detector for APD temperature |
| CN111244192A (en) * | 2018-11-29 | 2020-06-05 | 北京小米移动软件有限公司 | SPAD's control circuit, distance inductor module and mobile terminal |
-
2003
- 2003-05-07 CN CN 03230983 patent/CN2636213Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980668A (en) * | 2012-11-22 | 2013-03-20 | 广东汉唐量子光电科技有限公司 | Bipolar bias single photon detection method |
| CN103728030A (en) * | 2013-12-20 | 2014-04-16 | 中国科学院合肥物质科学研究院 | Self-adaptive near-infrared single-photon detector for APD temperature |
| CN111244192A (en) * | 2018-11-29 | 2020-06-05 | 北京小米移动软件有限公司 | SPAD's control circuit, distance inductor module and mobile terminal |
| CN111244192B (en) * | 2018-11-29 | 2022-02-15 | 北京小米移动软件有限公司 | SPAD's control circuit, distance inductor module and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |