CN204392260U - A kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system - Google Patents
A kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system Download PDFInfo
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- CN204392260U CN204392260U CN201520141545.4U CN201520141545U CN204392260U CN 204392260 U CN204392260 U CN 204392260U CN 201520141545 U CN201520141545 U CN 201520141545U CN 204392260 U CN204392260 U CN 204392260U
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Abstract
Based on a building area of a room sub-communication device for beam expanding lens-level crossing-telescopic system, relate to Technique on Quantum Communication between building.Link establishment module of the present utility model is realized by beam expanding lens-level crossing-telescopic system, polarization compensation module comes from the polarization beacon of transmitter with the angular deviation between track transmitter and receiver polarization benchmark by receiver detection, realizes polarization compensation by the half-wave plate of Rotation of receiver machine.The quantum communications device adopting the utility model to provide can realize carrying out point-to-point transmission and the real-time Transmission of security information between building, avoids the possibility being stolen security information by the Internet completely.The quantum communications device that the utility model provides has that link establishment is simple, atmospheric turbulance impact is less, quantum bit error rate is lower and quantum bit transfer rate comparatively advantages of higher.The utility model is applicable to the quantum communications between building.
Description
Technical field
The utility model relates to Technique on Quantum Communication between building.
Background technology
Along with developing rapidly of Global EC, secure communication seems particularly important in business, military affairs and the field such as diplomatic.Key in secure communication is key, and communication security is just the safety ensureing key.Quantum cryptography, more precisely quantum-key distribution, adopt the single photon communication technology, and communicating pair throughput subchannel and classical channel are set up, transmission security key.Can not cloning mechanisms according to quantum-mechanical uncertainty principle and quantum, the existence of any listener-in all can be found, thus ensures being perfectly safe of key, also just ensure that being perfectly safe of enciphered message.
Between building, carry out free space quantum communications, the point-to-point transmission of security information between communicating pair and real-time Transmission can be realized, the impact of the Internet on communicating pair Secret Information Transmission can be avoided completely.Because link range between building is in the magnitude of hundreds of rice or several kilometers, the impact of atmospheric turbulance on quantum communications is less, and quantum bit error rate is lower, and quantum bit transfer rate is higher.Between building, carry out quantum communications, need to consider communication code decoding problem, link establishment problem and polarization compensation problem.Solving point-to-point Technique on Quantum Communication between building, having great importance for setting up local building space quantum communication network system.
Utility model content
The purpose of this utility model is the problem being difficult to realize to solve point-to-point quantum communications between building, provides a kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system.
A kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system described in present embodiment comprises transmitter and receiver;
Described transmitter comprises the first laser diode LD 1, second laser diode LD 2, the 3rd laser diode LD 3, first variable optical attenuator OA1, the second variable optical attenuator OA2, the first polarizer P1, the second polarizer P2, the 3rd polarizer P3, the first beam splitter BS1, the second beam splitter BS2, beam expanding lens BE and the first level crossing M1;
The flashlight that first laser diode LD 1 produces is successively after the first variable optical attenuator OA1 and the first polarizer P1, be incident to the first beam splitter BS1, reflect through described first beam splitter BS1, the flashlight that second laser diode LD 2 produces is successively after the second variable optical attenuator OA2 and the second polarizer P2, be incident to the first beam splitter BS1, after described first beam splitter BS1 transmission, flashlight that send with the first laser diode LD 1, that reflect through described first beam splitter BS1 synthesizes light beam, i.e. the first synthesis light beam; First synthesis light beam is incident to the second beam splitter BS2, and through the second beam splitter BS2 transmission;
The flashlight that 3rd laser diode LD 3 produces, after the 3rd polarizer P3, is incident to the second beam splitter BS2, reflects through described second beam splitter BS2;
Flashlight that the first synthesis light beam and the 3rd laser diode LD 3 through the second beam splitter BS2 transmission sends, that reflect through the second beam splitter BS2 synthesizes light beam, and namely second synthesizes light beam;
Receiver comprises the second level crossing M2, telescope T, the 3rd beam splitter BS3, the 4th beam splitter BS4, the first interference filter IF1, the second interference filter IF2, the 4th polarizer P4, the 5th polarizer P5, the 6th polarizer P6, half-wave plate HWP, the first lens L1, the second lens L2, the first detector D1, the second detector D2 and the 3rd detector D3;
Described second synthesis light beam, after beam expanding lens BE expands, reflects through the first level crossing M1 reflection and the second level crossing M2 successively, then enters telescope T;
Be incident to the 3rd beam splitter BS3 from the light beam of telescope outgoing, and be divided into reverberation and transmitted light two-way by the 3rd beam splitter BS3;
Described reverberation after the first interference filter IF1 and the 4th polarizer P4, is incident to the light receiving surface of the 3rd detector D3 successively;
Described transmitted light, successively after the second interference filter IF2 and half-wave plate HWP, is incident to the 4th beam splitter BS4, and is divided into reverberation and transmitted light two-way by the 4th beam splitter BS4;
This reverberation after the 4th beam splitter BS4 and the first lens L1, is incident to the light receiving surface of the first detector D1 successively;
This transmitted light after the 6th polarizer P6 and the second lens L2, is incident to the light receiving surface of the second detector D2 successively.
A kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system described in the utility model, compared with existing quantum communications device, adds link establishment module and polarization compensation module.Link establishment module is realized by beam expanding lens-level crossing-telescopic system.Polarization compensation module comes from the polarization beacon of transmitter with the angular deviation between track transmitter and receiver polarization benchmark by receiver detection, realizes polarization compensation by the half-wave plate of Rotation of receiver machine.The quantum communications device adopting the utility model to provide can realize carrying out point-to-point transmission and the real-time Transmission of security information between building, avoids the possibility being stolen security information by the Internet completely.The quantum communications device that the utility model provides has that link establishment is simple, atmospheric turbulance impact is less, quantum bit error rate is lower and quantum bit transfer rate comparatively advantages of higher.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system described in the utility model.
Embodiment
Embodiment one: composition graphs 1 illustrates present embodiment, a kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system described in present embodiment, comprises transmitter and receiver;
Described transmitter comprises the first laser diode LD 1, second laser diode LD 2, the 3rd laser diode LD 3, first variable optical attenuator OA1, the second variable optical attenuator OA2, the first polarizer P1, the second polarizer P2, the 3rd polarizer P3, the first beam splitter BS1, the second beam splitter BS2, beam expanding lens BE and the first level crossing M1;
The flashlight that first laser diode LD 1 produces is successively after the first variable optical attenuator OA1 and the first polarizer P1, be incident to the first beam splitter BS1, reflect through described first beam splitter BS1, the flashlight that second laser diode LD 2 produces is successively after the second variable optical attenuator OA2 and the second polarizer P2, be incident to the first beam splitter BS1, after described first beam splitter BS1 transmission, flashlight that send with the first laser diode LD 1, that reflect through described first beam splitter BS1 synthesizes light beam, i.e. the first synthesis light beam; First synthesis light beam is incident to the second beam splitter BS2, and through the second beam splitter BS2 transmission;
The flashlight that 3rd laser diode LD 3 produces, after the 3rd polarizer P3, is incident to the second beam splitter BS2, reflects through described second beam splitter BS2;
Flashlight that the first synthesis light beam and the 3rd laser diode LD 3 through the second beam splitter BS2 transmission sends, that reflect through the second beam splitter BS2 synthesizes light beam, and namely second synthesizes light beam;
Receiver comprises the second level crossing M2, telescope T, the 3rd beam splitter BS3, the 4th beam splitter BS4, the first interference filter IF1, the second interference filter IF2, the 4th polarizer P4, the 5th polarizer P5, the 6th polarizer P6, half-wave plate HWP, the first lens L1, the second lens L2, the first detector D1, the second detector D2 and the 3rd detector D3;
Described second synthesis light beam, after beam expanding lens BE expands, reflects through the first level crossing M1 reflection and the second level crossing M2 successively, then enters telescope T;
Be incident to the 3rd beam splitter BS3 from the light beam of telescope outgoing, and be divided into reverberation and transmitted light two-way by the 3rd beam splitter BS3;
Described reverberation after the first interference filter IF1 and the 4th polarizer P4, is incident to the light receiving surface of the 3rd detector D3 successively;
Described transmitted light, successively after the second interference filter IF2 and half-wave plate HWP, is incident to the 4th beam splitter BS4, and is divided into reverberation and transmitted light two-way by the 4th beam splitter BS4;
This reverberation after the 4th beam splitter BS4 and the first lens L1, is incident to the light receiving surface of the first detector D1 successively;
This transmitted light after the 6th polarizer P6 and the second lens L2, is incident to the light receiving surface of the second detector D2 successively.
Single-photon source of the present utility model adopts altitude decay's laser pulse, quantum information state adopts Single Photon Polarization, quantum communications agreement adopts Bennett 1992 (B92) agreement, link establishment is based on beam expanding lens-level crossing-telescopic system, and polarization compensation is realized by rotatable halfwave plate.
The principle of transmitter and receiver as shown in Figure 1.In transmitter, the first laser diode LD 1 and the second laser diode LD 2 are signal optical source, 3rd laser diode LD 3 is beacon light source, first laser diode LD 1 and the second laser diode LD 2 produce the flashlight that wavelength is 850nm, after decaying respectively through the first variable optical attenuator OA1 and the second variable optical attenuator OA2, each average pulse number of photons is about 0.1, be that the first polarizer P1 of 1:1000 and the second polarizer P2 rise to the rear respectively by extinction ratio again, the photon polarization state that polarization direction is respectively 0 degree and 45 degree must be arrived, wherein 0 degree of polarization direction is the polarization benchmark of transmitter.3rd laser diode LD 3 produces the beacon beam that wavelength is 532nm, and the 3rd polarizer P3 being 1:1000 through extinction ratio plays the polarization beacon obtaining 0 degree of polarization direction to the rear.The flashlight that first laser diode LD 1 and the second laser diode LD 2 produce, the beacon beam produced with the 3rd laser diode LD 3 through 50/50 the first beam splitter BS1 and the second beam splitter BS2 restrainting, then expand through beam expanding lens BE, after the first level crossing M1 reflects, enter free space.
The light beam coming from transmitter enters the telescope T of receiver after the second level crossing M2 reflects, then obtains folded light beam and transmitted light beam after the 3rd beam splitter BS3 beam splitting of 50/50.Through the 3rd beam splitter BS3 folded light beam by centre wavelength be 532nm, bandwidth is the first interference filter IF1 filtering of 10nm, then received by the 3rd detector D3 after the 4th polarizer P4 analyzing that extinction ratio is 1:1000.Through the 3rd beam splitter BS3 transmitted light beam by centre wavelength be 850nm, bandwidth is the second interference filter IF2 filtering of 10nm, again after half-wave plate HWP, obtain folded light beam and transmitted light beam by after the 4th beam splitter BS4 beam splitting of 50/50.Folded light beam through the 4th beam splitter BS4 is received by the first detector D1 after focusing on by the 5th polarizer P5 analyzing, the first lens L1.Transmitted light beam through the 4th beam splitter BS4 is received by the second detector D2 after focusing on by the 6th polarizer P6 analyzing, the second lens L2.By rotating the angular deviation between the 4th polarizer P4 track transmitter and receiver polarization benchmark, realize polarization compensation by rotatable halfwave plate HWP.The polarization direction of the 5th polarizer P5 is 135 degree, and the first detector D1 is for receiving the photon of 0 degree of polarization state; The polarization direction of the 6th polarizer P6 is 90 degree, and the second detector D2 is for receiving the photon of 45 degree of polarization states.
In the transmitters and receivers, the first level crossing M1 and the second level crossing M2 forms two level crossing systems, and beam expanding lens BE, two level crossing systems and telescope T are used for setting up laser link between building.Transmitter and receiver has respective polarization benchmark and polarization zero direction, the polarization direction of the first polarizer P1, the second polarizer P2 and the 3rd polarizer P3 is based on the polarization benchmark of transmitter, and the polarization direction of the 4th polarizer P4, the 5th polarizer P5 and the 6th polarizer P6 is based on the polarization benchmark of receiver.
Embodiment two: present embodiment is the further restriction to a kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system described in execution mode one, in present embodiment, the first described detector D1 and the second detector D2 is SPCM-AQR-13-FC type single photon counting module.
Embodiment three: present embodiment is the further restriction to a kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system described in execution mode one, and in present embodiment, the 3rd described detector D3 is CCD.
Claims (3)
1., based on a building area of a room sub-communication device for beam expanding lens-level crossing-telescopic system, comprise transmitter and receiver, it is characterized in that:
Described transmitter comprises the first laser diode (LD1), the second laser diode (LD2), the 3rd laser diode (LD3), the first variable optical attenuator (OA1), the second variable optical attenuator (OA2), the first polarizer (P1), the second polarizer (P2), the 3rd polarizer (P3), the first beam splitter (BS1), the second beam splitter (BS2), beam expanding lens (BE) and the first level crossing (M1);
The flashlight that first laser diode (LD1) produces is successively after the first variable optical attenuator (OA1) and the first polarizer (P1), be incident to the first beam splitter (BS1), through described first beam splitter (BS1) reflection, the flashlight that second laser diode (LD2) produces is successively after the second variable optical attenuator (OA2) and the second polarizer (P2), be incident to the first beam splitter (BS1), after the transmission of described first beam splitter (BS1), send with the first laser diode (LD1), through the flashlight synthesis light beam that described first beam splitter (BS1) is reflected, i.e. the first synthesis light beam, first synthesis light beam is incident to the second beam splitter (BS2), and through the second beam splitter (BS2) transmission,
The flashlight that 3rd laser diode (LD3) produces, after the 3rd polarizer (P3), is incident to the second beam splitter (BS2), through described second beam splitter (BS2) reflection;
Flashlight that the first synthesis light beam and the 3rd laser diode (LD3) through the second beam splitter (BS2) transmission sends, that reflect through the second beam splitter (BS2) synthesizes light beam, and namely second synthesizes light beam;
Receiver comprises the second level crossing (M2), telescope (T), 3rd beam splitter (BS3), 4th beam splitter (BS4), first interference filter (IF1), second interference filter (IF2), 4th polarizer (P4), 5th polarizer (P5), 6th polarizer (P6), half-wave plate (HWP), first lens (L1), second lens (L2), first detector (D1), second detector (D2) and the 3rd detector (D3),
Described second synthesis light beam, after beam expanding lens (BE) expands, successively through the first level crossing (M1) reflection and the second level crossing (M2) reflection, then enters telescope (T);
Be incident to the 3rd beam splitter (BS3) from the light beam of telescope outgoing, and be divided into reverberation and transmitted light two-way by the 3rd beam splitter (BS3);
Described reverberation after the first interference filter (IF1) and the 4th polarizer (P4), is incident to the light receiving surface of the 3rd detector (D3) successively;
Described transmitted light is successively after the second interference filter (IF2) and half-wave plate (HWP), be incident to the 4th beam splitter (BS4), and be divided into reverberation and transmitted light two-way by the 4th beam splitter (BS4);
This reverberation after the 4th beam splitter (BS4) and the first lens (L1), is incident to the light receiving surface of the first detector (D1) successively;
This transmitted light after the 6th polarizer (P6) and the second lens (L2), is incident to the light receiving surface of the second detector (D2) successively.
2. a kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system according to claim 1, is characterized in that: described the first detector (D1) and the second detector (D2) are SPCM-AQR-13-FC type single photon counting module.
3. a kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system according to claim 1, is characterized in that: the 3rd described detector (D3) is CCD.
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| CN201520141545.4U CN204392260U (en) | 2015-03-12 | 2015-03-12 | A kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system |
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| CN201520141545.4U CN204392260U (en) | 2015-03-12 | 2015-03-12 | A kind of building area of a room sub-communication device based on beam expanding lens-level crossing-telescopic system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375989A (en) * | 2015-12-01 | 2016-03-02 | 中国科学院上海技术物理研究所 | Free-space quantum communication device and method having real-time polarization compensation |
| CN108933632A (en) * | 2018-07-17 | 2018-12-04 | 张淼淼 | A kind of quantum communications device between building |
| CN112994881A (en) * | 2021-04-19 | 2021-06-18 | 国开启科量子技术(北京)有限公司 | Transmitting end, receiving end and system for quantum communication |
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2015
- 2015-03-12 CN CN201520141545.4U patent/CN204392260U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375989A (en) * | 2015-12-01 | 2016-03-02 | 中国科学院上海技术物理研究所 | Free-space quantum communication device and method having real-time polarization compensation |
| CN108933632A (en) * | 2018-07-17 | 2018-12-04 | 张淼淼 | A kind of quantum communications device between building |
| CN112994881A (en) * | 2021-04-19 | 2021-06-18 | 国开启科量子技术(北京)有限公司 | Transmitting end, receiving end and system for quantum communication |
| CN112994881B (en) * | 2021-04-19 | 2021-07-27 | 国开启科量子技术(北京)有限公司 | Transmitting end, receiving end and system for quantum communication |
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Granted publication date: 20150610 Termination date: 20160312 |