CN209930269U - Polarization-maintaining large-range pointing type quantum communication optical device based on U-shaped optical path - Google Patents
Polarization-maintaining large-range pointing type quantum communication optical device based on U-shaped optical path Download PDFInfo
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Abstract
The patent discloses a polarization-maintaining large-range pointing type quantum communication optical device based on U type light path, this patent utilizes characteristics such as the two-dimensional tracking range of U type light path is big, response speed is fast based on the polarization-maintaining of U type light path and tracking, pointing and system quantum transmission function on a large scale, recycles the polarization maintaining characteristics of quantum communication system and carries out the transmission of quantum polarization code, reduces the bit error rate promptly. The system is mainly characterized in that a light path is established through camera tracking, quantum transmission is carried out through system polarization maintaining transmission, and a composition system capable of fast tracking and accurate quantum communication is formed. The method is suitable for the field of rapid tracking and also suitable for the field of quantum communication. The system has simple structure and strong engineering practice capability.
Description
Technical Field
The patent discloses a polarization-maintaining, pointing type quantum communication optical device on a large scale based on U type light path, specially adapted quantum communication field, remote tracking alignment field.
Background
As research on the polarization of light is deepened, people gradually recognize the wide application prospect of polarization information, and the polarization technology also starts to enter a practical stage. The research of quantum communication technology is close to the major requirement of national security, can be expected to greatly improve the security of information transmission, the capacity and the efficiency of an information transmission channel and the like, is an important strategic direction of the development of information technology in the future, is very likely to cause the revolution of a plurality of scientific and technical fields, and has immeasurable influence on the progress of economy and society. The current technical means of quantum communication mainly comprise: fiber channel based, free space channel based quantum transmission. However, due to the limitation of optical fiber materials, the loss and the decoherence effect of the optical fiber cannot be avoided, the performance of the current low-loss optical fiber approaches the theoretical limit, and the establishment of quantum channels by using the optical fiber at two points more than 100 kilometers away becomes very difficult. The free space quantum channel is one of the most feasible schemes for realizing long-distance quantum communication experiments at present, and the space quantum communication is in the key period from the principle research to the practical application. The application requirement of free space quantum communication is fully considered, and the success and failure of quantum communication can be guaranteed only by the factors of remote tracking, pointing and the like of the free space quantum communication. The quantum transmission system provided by the patent can complete ultrahigh-precision tracking and pointing and can complete high polarization maintaining, and provides powerful guiding significance for engineering practice.
Disclosure of Invention
The purpose of this patent is to provide a polarization-preserving, pointing type quantum communication optical device in a large scale based on U type light path, and the use of this patent device, in order better satisfy free space quantum communication's application demand, this patent is based on thick tracking camera and the mutual effect of fine tracking camera come the two-dimentional of regulation U type and carry out the optical axis registration. Thereby completing the quantum communication. The patent is mainly characterized in that: 1) the tracking and pointing can be rapidly carried out in a large range; 2) perfect polarization transmission can be ensured; 3) the U-shaped through-axis reflector group can reduce errors caused by two-dimensional adjustment; 4) the fast reflecting mirror group can carry out micro-adjustment to ensure that the transmission communication precision is higher.
This patent is based on polarization maintaining, pointing to type quantum communication optical device and method on a large scale of U type light path is shown as attached 1: this patent device includes 1, the preceding light path group 2 of thick tracking camera, U type wear the axle polarization maintaining reflector group 3, fast reflecting mirror group 4, the semi-transparent semi-reflecting mirror of 850nm 5, the fine tracking camera group 6, 850nm quantum communication optical group 7, corner reflector 8, wherein:
the rough tracking camera 1 is fixed on a front light path group 2 consisting of an off-axis afocal beam expanding system 201 and a first folding mirror 202, an optical axis of the rough tracking camera 1 is coaxial with an optical axis of the off-axis afocal beam expanding system 201 in a U-shaped frame, light beams are contracted through the off-axis afocal beam expanding system 201, contracted light spots enter a U-shaped through-axis polarization-preserving reflector group 3 through the first folding mirror 202 and are introduced into a rear light path, the light spots firstly enter a fast reflector group 4 to be micro-adjusted to enter a fine tracking camera 6, a light spot is formed in the fine tracking camera, and the fine tracking camera group 6 is adjusted to be in the central position of a light spot in a detector.
The 850nm quantum communication light group 7 consists of 4 paths of coaxial polarized light of 0 degree, 90 degrees, 45 degrees and 135 degrees, light spots enter the fast reflecting mirror group 6 through the 850nm semi-transparent semi-reflecting mirror 5 reflected light, then enter the U-shaped through-axis polarization-preserving reflecting mirror group 3, and finally are emitted by the front light path group through beam expansion. The transmission path enters the fine tracking camera set 6 through the corner reflector 8 and the 850nm half-mirror 5, and the 850nm quantum communication optical set 7 is adjusted to enable the fine tracking camera 6 and the incident light beam to be imaged at the same point. The incident spot is coaxial with the 850nm quantum communication light 7.
The polarization-maintaining and large-range pointing quantum communication optical device and method based on the U-shaped optical path have the following working flows:
this patent provides a polarization-maintaining, large-range directional type quantum communication optical device and method based on U type light path, and its main theory of operation is: firstly, light is emitted from infinity, the rough tracking camera 1 guides a U-shaped two-dimensional turntable to perform two-dimensional large-range adjustment to track the light from infinity, then the two-dimensional direction is finely adjusted to enable a light spot to be adjusted to the central position of a detector of the rough tracking camera 1, the light spot enters the U-shaped through-axis polarization-preserving reflector group 3 to perform light beam through-axis after being shrunk by the off-axis afocal beam expanding system 201, then the light spot enters the central position of the detector of the fine tracking camera group 6 by performing micro-adjustment by the over-fast reflector group 4, and the central position of the detector of the fine tracking camera group 6 is kept unchanged. Then, carrying out polarization encoding on the 850nm quantum communication optical group 7, carrying out polarization transmission on the 850nm quantum communication optical group 7 with the polarization encoding, firstly passing through the 850nm semi-transparent semi-reflective mirror 5, then entering the fast reflective mirror group 4, then entering the U-shaped two-dimensional turntable front optical path 2 through the U-shaped through-axis polarization-preserving reflector group 3, expanding the beam through the off-axis afocal beam expanding system 201, transmitting the 850nm quantum communication optical group 7 with the polarization encoding to another polarization decoding load through the off-axis afocal beam expanding system 201, and further completing the function of polarization transmission of the 850nm quantum communication optical group 7.
The purpose of this patent is to provide a polarization maintaining, directive type quantum communication light device and method on a large scale based on U type light path, both can satisfy quick high accuracy and trace the directive, also can change the device and satisfy the quantum communication light of specific wavelength, and the characteristics of this patent are mainly reflected in:
1) can quickly track and point in large range and high precision
2) Can ensure perfect polarization transmission
3) The through-axis reflector can reduce rotation error caused by two-dimensional adjustment
4) The micro light spot adjustment of the fast reflecting mirror group can ensure that the transmission communication precision is higher
Drawings
Fig. 1 is a schematic diagram of a polarization-maintaining and large-range-directing quantum communication optical device and method based on a U-shaped optical path.
Fig. 2 is a schematic diagram of a front optical path set in the embodiment.
FIG. 3 is a diagram of an embodiment of an 850nm quantum communication optical group.
Detailed Description
An embodiment of the method of the present patent will be described in detail below with reference to the accompanying drawings.
The main components employed in this patent are described below:
1. coarse tracking camera 1: the tracking camera consists of a convergent lens and a CCD camera, wherein the convergent lens adopts a customized model and main performance parameters thereof; lens processing parameter requirements: the surface type RMS value of the light-transmitting surface is better than 1/20 lambda 0@632.8 nm; the RMS value of the system aberration is better than 1/10 lambda 0@632.8nm, the clear aperture is 30mm, and the focal length f of the lens is 0.154 m. The CCD camera adopts a light beam analyzer with the model number SP620 of Spiricon company in America, and the main performance parameters are as follows: the working wave band is 190nm-1100nm, the pixel size is 4.4um by 4.4um, and the number of pixels is 1600 by 1200.
2. Front optical path 2 group: the off-axis afocal beam expanding system 201 is customized, the magnification is 10 times, the aperture of a telescope is 180mm, the size of a light spot after beam contraction is 18mm, and the surface accuracy requirement of the system is 1/10 lambda @632.8 nm; the first folding mirror 202 adopts a customized polarization-maintaining metal reflector, and the surface accuracy requirement is 1/30 lambda @632.8 nm;
3. u-shaped through-axis polarization-preserving mirror group 3: customization, the polarization extinction ratio of 850nm in the 45-degree direction is more than 3000:1, the through-axis polarization-maintaining reflectors are distributed in the U-shaped two-dimensional rotating shaft direction, and the surface accuracy requirement is 1/30 lambda @632.8nm
4. Fast mirror group 4: the fast reflecting mirror group is customized to be 850nm, and the polarization extinction ratio in the 45-degree direction is more than 4000: 1, the surface type precision requires 1/30 lambda @632.8nm, and micro-adjustment can be rapidly carried out.
5. 850nm half mirror 5: customization, for a wavelength 50 at 850 nm: 50 portions of light are split.
6. The fine tracking camera set 6: the fine tracking camera consists of a telephoto lens and a CCD camera, wherein the telephoto lens adopts a customized model and has main performance parameters; lens processing parameter requirements: the surface type RMS value of the light-transmitting surface is better than 1/20 lambda 0@632.8 nm; the RMS value of the system aberration is better than 1/10 lambda 0@632.8nm, the clear aperture is 30mm, and the focal length f of the lens is 6.875 m. The CCD camera adopts a light beam analyzer with the model number SP620 of Spiricon company in America, and the main performance parameters are as follows: the working wave band is 190nm-1100nm, the pixel size is 4.4um by 4.4um, and the number of pixels is 1600 by 1200.
7. 850nm quantum communication optical group 7: the BB84 module has four paths of communication light of 0 degree, 90 degree, 45 degree and 135 degree as coded communication light, and the divergence angle is 80urad
8. Corner reflector 8: the cube-corner prism of the Thorlabs company with the model number PS971 is adopted, and the main performance parameters are as follows: the surface profile of the light-transmitting surface is better than lambda/10 @632.8 nm; the rotation precision is less than 3', the light transmission aperture is 25.4mm, and the light transmission range is 400-.
The schematic diagram of the patent method is shown in the attached figure 1, and the specific situation is described as follows:
this patent device includes 1, the preceding light way group 2, the axle polarization maintaining reflector group 3 is worn to the U type, 4, the semi-transparent semi-reflecting mirror of 850nm group, the fine tracking camera group 6, 850nm quantum communication optical group 7, corner reflector 8 of fast reflection mirror group, its characterized in that:
the rough tracking camera 1 is fixed on a front light path group 2 consisting of an off-axis afocal beam expanding system 201 and a first folding mirror 202, an optical axis of the rough tracking camera 1 is coaxial with an optical axis of the off-axis afocal beam expanding system 201 in a U-shaped frame, a light beam is contracted through the off-axis afocal beam expanding system 201, a contracted light spot enters a rear light path through the first folding mirror 202 and a through-axis polarization maintaining reflector 3, then enters a fast reflector group 4 to micro-adjust the light spot and introduce the light spot into the fine tracking camera 6, a light spot is formed in the fine tracking camera, and the fine tracking camera group 6 is adjusted to enable the light spot to be in the center position of a detector.
The 850nm quantum communication light group 7 consists of 4 paths of coaxial polarized light of 0 degree, 90 degrees, 45 degrees and 135 degrees, light spots enter the fast reflecting mirror group 6 through the 850nm semi-transparent semi-reflecting mirror 5 reflected light, then enter the U-shaped through-axis polarization-preserving reflecting mirror group 3, and are finally expanded by the front light path group 2 to be emitted. The transmission path enters the fine tracking camera set 6 through the corner reflector 8 and the 850nm semi-transparent semi-reflective mirror 5, and the 850nm quantum communication optical set 7 is adjusted to enable the fine tracking camera set 6 and the incident beam to be imaged at the same point. The incident light spot is coaxial with the 850nm quantum communication light group 7.
The polarization-maintaining and large-range pointing quantum communication optical device and method based on the U-shaped optical path have the following working flows:
this patent provides a polarization-maintaining, large-range directional type quantum communication optical device and method based on U type light path, and its main theory of operation is: firstly, light is emitted from infinity, the U-shaped frame is subjected to two-dimensional adjustment, the rough tracking camera 1 can track the light from infinity, then the two-dimensional direction of the U-shaped frame is adjusted again, so that a light spot is adjusted to the central position of a detector of the rough tracking camera 1, the light spot is condensed by the off-axis afocal beam expanding system 201, enters the U-shaped through-axis polarization-preserving reflector group 3 to be subjected to light beam through-axis, then is subjected to micro-adjustment by the over-fast reflector group 4 so that the light spot is introduced to the central position of the detector of the fine tracking camera group 6, and is kept unchanged at the central position of the detector of the fine tracking camera group 6.
Then, 850nm quantum communication light group 7 polarization encoding is carried out, 850nm quantum communication light with polarization encoding is subjected to polarization transmission, the light firstly passes through a 850nm semi-transparent semi-reflecting mirror 5, then enters a fast reflecting mirror group 4, then passes through a U-shaped through-axis polarization-preserving reflector group 3, enters a U-shaped two-dimensional turntable front light path 2, is expanded through an off-axis afocal beam expanding system 201, and is expanded to another polarization decoding load through the off-axis afocal beam expanding system 201, so that the security transmission function of the 850nm quantum communication light is completed.
Claims (7)
1. The utility model provides a polarization-preserving is directive type quantum communication optical device on a large scale based on U type light path, includes coarse tracking camera (1), preceding light path group (2), U type cross axle polarization-preserving speculum group (3), fast reflecting mirror group (4), 850nm semi-transparent semi-reflecting mirror (5), smart tracking camera group (6), 850nm quantum communication optical group (7), corner reflector (8), its characterized in that:
the rough tracking camera (1) is fixed on a front light path group (2) consisting of an off-axis afocal beam expanding system (201) and a first folding mirror (202), an optical axis of the rough tracking camera (1) is coaxial with an optical axis of the off-axis afocal beam expanding system (201) arranged in a U-shaped two-dimensional turntable, light beams are contracted through the off-axis afocal beam expanding system (201), contracted light spots enter a U-shaped through-axis polarization-preserving reflector group (3) through the first folding mirror (202) and enter a rear light path, the contracted light spots firstly enter a zero-position fast reflector group (4), then the light spots enter the direction of a fine tracking camera group (6), a light spot is formed in the fine tracking camera, and the fine tracking camera group (6) is adjusted to enable the light spots to be fastened with the camera component at the center position of a detector;
the 850nm quantum communication optical group (7) generates four paths of 850nm polarized light of 0 degree, 90 degrees, 45 degrees and 135 degrees, light spots enter the fast reflecting mirror group (4) through the 850nm semi-transparent semi-reflecting mirror (5) reflected light, then enter the U-shaped through-axis polarization-preserving reflecting mirror group (3) and are finally emitted by front light path beam expansion; the transmission path enters the fine tracking camera set (6) through the corner reflector (8) and the 850nm semi-transparent semi-reflecting mirror (5), and the 850nm quantum communication optical set (7) is adjusted to enable the fine tracking camera set (6) and the incident light beam to be imaged at the same point, so that the incident light spot and the 850nm quantum communication optical set (7) are coaxial.
2. The polarization-maintaining wide-range directional quantum communication optical device based on the U-shaped optical path as claimed in claim 1, wherein: the coarse tracking camera (1) is a large-view-field camera, the view field range is 2 degrees X2 degrees, and the angular resolution is 50 urad.
3. The polarization-maintaining wide-range directional quantum communication optical device based on the U-shaped optical path as claimed in claim 1, wherein: the front light path group (2) consists of an off-axis afocal beam expanding system (201) and a first folding mirror (202), has the functions of adjusting the azimuth and the elevation angle and has the function of beam expanding.
4. The polarization-maintaining wide-range directional quantum communication optical device based on the U-shaped optical path as claimed in claim 1, wherein: the U-shaped through-axis polarization-maintaining reflector group (3) is composed of six polarization-maintaining reflectors matched with a two-dimensional structure rotating shaft of a U-shaped light path, has the functions of polarization maintaining and a two-dimensional axis system penetrating through the U-shaped light path, and has the compensation surface shape RMS value superior to 1/100 lambda @632.8 nm.
5. The polarization-maintaining wide-range directional quantum communication optical device based on the U-shaped optical path as claimed in claim 1, wherein: the fast reflecting mirror group (4) consists of a polarization-maintaining reflecting mirror and piezoelectric ceramics, can carry out rapid angular motion within 2, and has a surface shape RMS value superior to 1/100 lambda @632.8 nm.
6. The polarization-maintaining wide-range directional quantum communication optical device based on the U-shaped optical path as claimed in claim 1, wherein: the fine tracking camera set (6) can read the centroid point of an imaging spot in real time, the surface shape RMS value is better than 1/100 lambda @632.8nm, the field range is 640urad +/-5%, and the angular resolution is 5urad +/-5%.
7. The polarization-maintaining wide-range directional quantum communication optical device based on the U-shaped optical path as claimed in claim 1, wherein: the 0 degree, 90 degree, 45 degree and 135 degree 4-path polarized lights generated by the 850nm quantum communication light group (7) are coaxial, and the coaxiality of the 4 polarized lights is within 3 urad.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098874A (en) * | 2019-05-17 | 2019-08-06 | 中国科学院上海技术物理研究所 | The a wide range of directing quantum communications electro-optical device of polarization-maintaining and method based on U-shaped optical path |
| CN113485023A (en) * | 2021-07-06 | 2021-10-08 | 上海国科航星量子科技有限公司 | Polarization maintaining optical path system based on directional mirror |
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- 2019-05-17 CN CN201920708749.XU patent/CN209930269U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098874A (en) * | 2019-05-17 | 2019-08-06 | 中国科学院上海技术物理研究所 | The a wide range of directing quantum communications electro-optical device of polarization-maintaining and method based on U-shaped optical path |
| CN110098874B (en) * | 2019-05-17 | 2023-12-26 | 中国科学院上海技术物理研究所 | Polarization-maintaining large-range pointing quantum communication optical device and method based on U-shaped optical path |
| CN113485023A (en) * | 2021-07-06 | 2021-10-08 | 上海国科航星量子科技有限公司 | Polarization maintaining optical path system based on directional mirror |
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