CN110609368A - Refrigeration box optical fiber via hole sealing device, refrigeration box and single photon detection device - Google Patents
Refrigeration box optical fiber via hole sealing device, refrigeration box and single photon detection device Download PDFInfo
- Publication number
- CN110609368A CN110609368A CN201810623785.6A CN201810623785A CN110609368A CN 110609368 A CN110609368 A CN 110609368A CN 201810623785 A CN201810623785 A CN 201810623785A CN 110609368 A CN110609368 A CN 110609368A
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- China
- Prior art keywords
- hole
- optical fiber
- expansion sleeve
- refrigeration
- refrigeration box
- Prior art date
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- Pending
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 66
- 239000013307 optical fiber Substances 0.000 title claims abstract description 49
- 238000007789 sealing Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 title claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 13
- 239000013013 elastic material Substances 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/4471—Terminating devices ; Cable clamps
- G02B6/44775—Cable seals e.g. feed-through
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/444—Systems or boxes with surplus lengths
- G02B6/4441—Boxes
- G02B6/4442—Cap coupling boxes
- G02B6/4444—Seals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/444—Systems or boxes with surplus lengths
- G02B6/4441—Boxes
- G02B6/4448—Electro-optic
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/4471—Terminating devices ; Cable clamps
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention belongs to the technical field of single photon detection, and particularly relates to a refrigeration box optical fiber via hole sealing device, a refrigeration box and a single photon detection device, which comprise a through hole and a plug, wherein the through hole is formed in the box wall of the refrigeration box and penetrates through the box wall, the plug is matched with the through hole, and the plug and the through hole form detachable connection; the inner wall of the through hole and/or the outer wall of the plug are/is provided with a strip groove, two ends of the strip groove respectively penetrate through the inner side and the outer side of the box wall, and the strip groove forms a through hole for the optical fiber to pass through; one end of the optical fiber is coupled inside the APD in the refrigeration box, the other end of the optical fiber is connected with an optical fiber jumper head outside the refrigeration box, and the aperture of the through hole is set to be at least capable of allowing the APD or the optical fiber jumper head to pass through. According to the invention, any plurality of through holes can be arranged around the through hole according to actual needs, the whole device only needs one hole opening part, and the sealing property and the economical efficiency of the whole refrigeration box can be indirectly improved by reducing the number of the holes.
Description
Technical Field
The invention belongs to the technical field of single photon detection, and particularly relates to a refrigeration box optical fiber via hole sealing device, a refrigeration box and a single photon detection device.
Background
The most important device in the field of single photon detectors at present is an Avalanche Photo Diode (APD), which is a photovoltaic detector element used in the field of optical detection, and the APD has the main function of converting an optical signal into an electrical signal for output, and becomes a preferred signal detection device in optical communication due to the characteristics of high sensitivity, high gain and high response speed. Avalanche Photodiodes (APDs) have the greatest advantage of amplification and photodetectors made from them have very high sensitivity, typically 10-20dB higher than that of PIN photodetectors. Avalanche photodiodes also have disadvantages: first, it generates a new noise, avalanche noise; secondly, the thermal motion in the APD is violent at normal temperature, so that dark counting can be generated, and the normal receiving of photons is influenced; third, the operating voltage is greatly affected by the ambient temperature, and the required operating voltage is high at normal temperature and low at low temperature. In order to reduce the dark count of the APD and reduce the working voltage of the APD, the APD needs to work in a low-temperature and light-free environment, and the temperature at least needs to reach minus 40 ℃ or minus 50 ℃; the APD is usually placed in a sealed refrigeration box, in which a refrigeration component, such as a thermoelectric refrigeration component (TEC), is used to refrigerate the APD, and the local temperature of the APD is kept constant by a temperature control circuit. In the conventional refrigeration box device, as a common arrangement, a radio frequency signal connector for outputting a radio frequency signal converted by an APD (avalanche photo diode) and a control signal connector for providing a control signal for a refrigeration assembly inside the refrigeration box are arranged on the side wall of the refrigeration box, and the refrigeration assembly is connected with a radiator.
In most APDs in the current market, optical fibers are directly coupled into the APDs at the input ends of the APDs, and the other ends of optical fiber tail pipes of the APDs are connected with optical fiber jumper terminals; in use in a single photon detector, the APD is placed inside the refrigeration cassette, but a portion of its fiber pigtail is outside the refrigeration cassette along with the fiber pigtail. Therefore, an optical fiber through hole needs to be designed on the refrigeration box, and the tightness of the through hole is guaranteed.
The invention patent ZL201310270105.4 discloses an optical fiber via hole sealing connector on a refrigeration box in a patent of 'a sealing refrigeration box and an optical fiber via hole sealing connector convenient to disassemble and assemble', wherein each TEC can be used for refrigerating two APDs, so that two APDs are connected into each refrigeration box. The optical fiber via hole adopts a double-hole mode as the via hole of two optical fibers; the optical fiber through hole connector is structurally divided into an inner locking nut, a split bolt divided into two halves and an outer locking nut. The disadvantages of this sealed connector are: an optical fiber needs an independent via hole, so that the cost is high, the structure of the via hole connector is complex, the assembly is complex, and the production is not facilitated.
Disclosure of Invention
The technical problem to be solved by the invention is that the existing refrigeration box optical fiber via hole sealing device, refrigeration box and single photon detection device are complex in structure, complex in assembly and not beneficial to production.
In order to solve the technical problems, the invention provides the following technical scheme:
the optical fiber via hole sealing device for the refrigeration box comprises a through hole and a plug, wherein the through hole is formed in the box wall of the refrigeration box and penetrates through the box wall, the plug is matched with the through hole, and the plug and the through hole form detachable connection; the inner wall of the through hole and/or the outer wall of the plug are/is provided with a strip groove, two ends of the strip groove respectively penetrate through the inner side and the outer side of the box wall, and the strip groove forms a through hole for the optical fiber to pass through; one end of the optical fiber is coupled inside the APD in the refrigeration box, the other end of the optical fiber is connected with an optical fiber jumper head outside the refrigeration box, and the aperture of the through hole is set to be at least capable of allowing the APD or the optical fiber jumper head to pass through.
Preferably, the number of the strip grooves is at least two, and the strip grooves are arranged at intervals along the circumferential direction of the through hole or the plug.
Preferably, the through hole is a threaded hole, and the plug is a threaded column matched with the threaded hole.
Preferably, the plug comprises an expansion sleeve and a plunger, the expansion sleeve being made of an elastic material, the plunger and the expansion sleeve being arranged to enable the expansion sleeve to expand radially when the plunger is inserted into the expansion sleeve; the expansion sleeve and the through hole are assembled in such a way that the outer annular surface of the expansion sleeve and the inner annular surface of the through hole form an interference fit when the expansion sleeve is in an expansion state, and the outer annular surface of the expansion sleeve and the inner annular surface of the through hole form a clearance fit when the expansion sleeve is in a non-expansion state.
Preferably, the outer ring surface of the plunger is provided with external threads, the outer diameter of the plunger is larger than the inner diameter of the expansion sleeve, and the end part of the plunger or the expansion sleeve is provided with a conical surface structure which is convenient for the plunger to be screwed into the expansion sleeve.
Preferably, the inner annular surface of the expansion sleeve and/or the outer annular surface of the plunger is conical surface-shaped.
Preferably, a sinking platform is arranged in the through hole, and the expansion sleeve is provided with a limiting part in blocking connection with the sinking platform.
Preferably, the gap between the optical fiber and the via hole is filled with a sealant.
The invention also provides a refrigeration box comprising the optical fiber via hole sealing device of the refrigeration box.
The invention also provides a single photon detection device comprising the refrigeration box.
The invention has the technical effects that: according to the invention, any plurality of through holes can be arranged around the through hole according to actual needs, the whole device only needs one hole opening part, and the sealing property and the economical efficiency of the whole refrigeration box can be indirectly improved by reducing the number of the holes. The sealing device is simple in structure, convenient and fast to assemble and beneficial to production.
Drawings
Fig. 1 is an exploded view of a refrigeration cassette optical fiber via sealing arrangement provided in embodiment 1 of the present invention;
fig. 2 is an assembly view of a refrigeration cassette fiber via sealing arrangement provided in embodiment 1 of the present invention;
fig. 3 is an exploded view of a refrigeration cassette optical fiber via sealing arrangement provided in embodiment 2 of the present invention;
fig. 4 is an assembly view of a refrigeration cassette fiber via sealing arrangement provided in embodiment 2 of the present invention;
fig. 5 is an exploded view of a refrigeration cassette fiber via sealing arrangement provided in embodiment 3 of the present invention;
fig. 6 is an assembly view of the optical fiber via sealing device of the refrigeration cassette according to embodiment 3 of the present invention.
Detailed Description
The present invention is described in detail below with reference to the attached drawings.
Example 1
As shown in fig. 1 and 2, a device for sealing an optical fiber via hole of a refrigeration box comprises a through hole 12 formed in a box wall of a refrigeration box 10 and penetrating through the box wall, and a plug matched with the through hole 12, wherein the plug and the through hole 12 form a detachable connection; a strip groove 13 is formed in the inner wall of the through hole 12, two ends of the strip groove 13 respectively penetrate through the inner side and the outer side of the box wall, and the strip groove 13 forms a through hole for the optical fiber 11 to pass through; one end of the optical fiber 11 is coupled inside the APD15 in the refrigeration box 10, the other end of the optical fiber is connected with an optical fiber jumper head outside the refrigeration box 10, and the aperture of the through hole 12 is set to be at least capable of being penetrated by the APD15 or the optical fiber jumper head. The number of the strip grooves 13 is two, and the strip grooves are arranged at intervals along the circumferential direction of the through hole 12 or the plug. In a preferred embodiment of the present invention, the through hole 12 is a threaded hole, and the plug is a threaded post 14 matched with the threaded hole. And the gap between the optical fiber 11 and the via hole is filled with sealant, so that the sealing performance of the optical fiber is further ensured.
According to the invention, any plurality of through holes can be arranged around the through hole 12 according to actual needs, the whole device only needs one hole opening part, and the sealing performance and the economical efficiency of the whole refrigeration box 10 can be indirectly improved by reducing the number of the holes. The sealing device is simple in structure, convenient and fast to assemble and beneficial to production.
Example 2
As shown in fig. 3 and 4, the present embodiment differs from embodiment 1 only in that: the plug comprises an expansion sleeve 16 and a plunger 17, the expansion sleeve 16 is made of elastic material, and the plunger 17 and the expansion sleeve 16 are assembled to enable the expansion sleeve 16 to expand along the radial direction when the plunger 17 is inserted into the expansion sleeve 16; the expansion shell 16 and the through hole 12 are assembled such that the outer annular surface of the expansion shell 16 forms an interference fit with the inner annular surface of the through hole 12 when the expansion shell 16 is in the expanded state, and the outer annular surface of the expansion shell 16 forms a clearance fit with the inner annular surface of the through hole 12 when the expansion shell 16 is in the non-expanded state. Preferably, the outer ring surface of the plunger 17 is provided with external threads, the outer diameter of the plunger 17 is larger than the inner diameter of the expansion sleeve 16, and the end of the plunger 17 or the expansion sleeve 16 is provided with a conical surface structure which is convenient for the plunger 17 to be screwed into the expansion sleeve 16. The through hole 12 is internally provided with a sinking platform 121, the expansion sleeve 16 is provided with a limiting part 161 which is blocked and connected with the sinking platform 121, and the sinking platform 121 and the limiting part 161 are blocked and connected to prevent the expansion sleeve 16 from sliding towards the inner side of the refrigeration box 10 under the action of external force when the plunger 17 is installed. The stopper 161 is further provided with a notch for avoiding the optical fiber 11.
Example 3
As shown in fig. 5 and 6, the present embodiment differs from embodiment 2 only in that: the inner ring surface of the expansion sleeve 16 and the outer ring surface of the plunger 17 are conical surface-shaped. The outer end of the plunger 17 is provided with a gland 171 which is convenient for applying external force to press, and the inner side of the gland 171 is provided with a notch for inserting a pry bar so as to be convenient for detaching the plunger 17. The embodiment directly adopts a push type assembly structure, and the assembly and disassembly processes are simpler. In addition, the groove 13 in this embodiment is formed in the expansion sleeve 16, the inner end surface of the expansion sleeve 16 constitutes the stopper, and the sinking platform 121 of the through hole 12 is formed with a notch for avoiding the optical fiber 11.
Example 4
The embodiment provides a refrigeration box 10 comprising the optical fiber via hole sealing device of the refrigeration box in any one of the above embodiments.
Example 5
The embodiment provides a single photon detection device comprising the refrigeration box 10 in the embodiment 4.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a refrigeration box optic fibre via hole sealing device which characterized in that: the refrigerator comprises a through hole (12) which is arranged on the wall of a refrigeration box (10) and penetrates through the wall of the refrigeration box, and a plug which is matched with the through hole (12), wherein the plug and the through hole (12) form detachable connection; the inner wall of the through hole (12) and/or the outer wall of the plug is/are provided with a strip groove (13), two ends of the strip groove (13) respectively penetrate through the inner side and the outer side of the box wall, and the strip groove (13) forms a through hole for the optical fiber (11) to pass through; one end of the optical fiber (11) is coupled inside an APD (15) in the refrigeration box (10), the other end of the optical fiber is connected with an optical fiber jumper head outside the refrigeration box (10), and the aperture of the through hole (12) is set to be at least capable of allowing the APD (15) or the optical fiber jumper head to pass through.
2. The refrigeration cassette fiber optic via sealing device of claim 1, wherein: the number of the strip grooves (13) is at least two, and the strip grooves are circumferentially arranged at intervals along the through holes (12) or the plugs.
3. The refrigeration cassette fiber optic via sealing device of claim 1, wherein: the through hole (12) is a threaded hole, and the plug is a threaded column (14) matched with the threaded hole.
4. The refrigeration cassette fiber optic via sealing device of claim 1, wherein: the plug comprises an expansion sleeve (16) and a plunger (17), the expansion sleeve (16) is made of elastic materials, and the plunger (17) and the expansion sleeve (16) are assembled to enable the expansion sleeve (16) to expand along the radial direction when the plunger (17) is inserted into the expansion sleeve (16); the expansion sleeve (16) and the through hole (12) are assembled in such a way that the outer annular surface of the expansion sleeve (16) forms an interference fit with the inner annular surface of the through hole (12) when the expansion sleeve (16) is in an expanded state, and the outer annular surface of the expansion sleeve (16) forms a clearance fit with the inner annular surface of the through hole (12) when the expansion sleeve (16) is in a non-expanded state.
5. The refrigeration cassette fiber optic via sealing device of claim 4, wherein: the outer ring surface of the plunger piston (17) is provided with external threads, the outer diameter of the plunger piston (17) is larger than the inner diameter of the expansion sleeve (16), and the end part of the plunger piston (17) or the expansion sleeve (16) is provided with a conical surface structure which is convenient for the plunger piston (17) to be screwed into the expansion sleeve (16).
6. The refrigeration cassette fiber optic via sealing device of claim 4, wherein: the inner ring surface of the expansion sleeve (16) and/or the outer ring surface of the plunger (17) are conical surface-shaped.
7. The refrigeration cassette fiber optic via sealing device of claim 4, wherein: a sinking platform (121) is arranged in the through hole (12), and the expansion sleeve (16) is provided with a limiting part (161) which is blocked and connected with the sinking platform (121).
8. The refrigeration cassette fiber optic via sealing device of any of claims 1 to 7, wherein: and the gap between the optical fiber (11) and the via hole is filled with sealant.
9. A refrigeration cassette comprising the refrigeration cassette optical fiber via sealing apparatus of any of claims 1 to 8.
10. A single photon detection device comprising the refrigeration cassette of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810623785.6A CN110609368A (en) | 2018-06-15 | 2018-06-15 | Refrigeration box optical fiber via hole sealing device, refrigeration box and single photon detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810623785.6A CN110609368A (en) | 2018-06-15 | 2018-06-15 | Refrigeration box optical fiber via hole sealing device, refrigeration box and single photon detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110609368A true CN110609368A (en) | 2019-12-24 |
Family
ID=68888640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810623785.6A Pending CN110609368A (en) | 2018-06-15 | 2018-06-15 | Refrigeration box optical fiber via hole sealing device, refrigeration box and single photon detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110609368A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188657A (en) * | 2021-05-08 | 2021-07-30 | 国开启科量子技术(北京)有限公司 | Single photon detection device and quantum communication equipment comprising same |
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|---|---|---|---|---|
| CN1401091A (en) * | 2000-02-11 | 2003-03-05 | 泰科电子雷伊化学有限公司 | Wraparound seal for optical fibres |
| KR20110028685A (en) * | 2009-09-14 | 2011-03-22 | 선일텔레콤 주식회사 | Sealing structure for optical cable insert hole of optical cable connecting box |
| EP2330707A1 (en) * | 2009-12-03 | 2011-06-08 | Tyco Electronics Raychem BVBA | Gel sealing device |
| US20130028568A1 (en) * | 2011-07-29 | 2013-01-31 | Hubert Blair Beamon | Fiber optic cables seal and/or strain relief members, and related assemblies and methods |
| CN103336336A (en) * | 2013-06-28 | 2013-10-02 | 安徽量子通信技术有限公司 | Seal refrigerating box convenient to dismantle and mount and optical fiber via hole hermetically sealed connector |
| CN203630404U (en) * | 2013-11-06 | 2014-06-04 | ***通信集团江苏有限公司 | Fixing and sealing device |
| CN103984070A (en) * | 2013-02-08 | 2014-08-13 | 泰科电子(上海)有限公司 | Wire rod fixing device |
| US20140304970A1 (en) * | 2011-11-22 | 2014-10-16 | Tyco Electronics Raychem Bvba | System and method for mounting blown fiber tubes to a housing |
| CN107748416A (en) * | 2017-11-30 | 2018-03-02 | 金信诺（常州）轨道信号***科技有限公司 | Optical fiber connector socket |
| CN208224564U (en) * | 2018-06-15 | 2018-12-11 | 科大国盾量子技术股份有限公司 | Refrigeration cassette optical fiber via seal device, refrigeration cassette and single photon detecting element |
-
2018
- 2018-06-15 CN CN201810623785.6A patent/CN110609368A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401091A (en) * | 2000-02-11 | 2003-03-05 | 泰科电子雷伊化学有限公司 | Wraparound seal for optical fibres |
| KR20110028685A (en) * | 2009-09-14 | 2011-03-22 | 선일텔레콤 주식회사 | Sealing structure for optical cable insert hole of optical cable connecting box |
| EP2330707A1 (en) * | 2009-12-03 | 2011-06-08 | Tyco Electronics Raychem BVBA | Gel sealing device |
| US20130028568A1 (en) * | 2011-07-29 | 2013-01-31 | Hubert Blair Beamon | Fiber optic cables seal and/or strain relief members, and related assemblies and methods |
| US20140304970A1 (en) * | 2011-11-22 | 2014-10-16 | Tyco Electronics Raychem Bvba | System and method for mounting blown fiber tubes to a housing |
| CN103984070A (en) * | 2013-02-08 | 2014-08-13 | 泰科电子(上海)有限公司 | Wire rod fixing device |
| CN103336336A (en) * | 2013-06-28 | 2013-10-02 | 安徽量子通信技术有限公司 | Seal refrigerating box convenient to dismantle and mount and optical fiber via hole hermetically sealed connector |
| CN203630404U (en) * | 2013-11-06 | 2014-06-04 | ***通信集团江苏有限公司 | Fixing and sealing device |
| CN107748416A (en) * | 2017-11-30 | 2018-03-02 | 金信诺（常州）轨道信号***科技有限公司 | Optical fiber connector socket |
| CN208224564U (en) * | 2018-06-15 | 2018-12-11 | 科大国盾量子技术股份有限公司 | Refrigeration cassette optical fiber via seal device, refrigeration cassette and single photon detecting element |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188657A (en) * | 2021-05-08 | 2021-07-30 | 国开启科量子技术(北京)有限公司 | Single photon detection device and quantum communication equipment comprising same |
| CN113188657B (en) * | 2021-05-08 | 2022-05-17 | 国开启科量子技术(北京)有限公司 | Single photon detection device and quantum communication equipment comprising same |
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