CN210670078U - Long-wave infrared wireless optical communication receiving-transmitting separated optical antenna - Google Patents
Long-wave infrared wireless optical communication receiving-transmitting separated optical antenna Download PDFInfo
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- CN210670078U CN210670078U CN201922363118.1U CN201922363118U CN210670078U CN 210670078 U CN210670078 U CN 210670078U CN 201922363118 U CN201922363118 U CN 201922363118U CN 210670078 U CN210670078 U CN 210670078U
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Abstract
The utility model relates to an infrared wireless optical communication's of long wave receiving and dispatching disconnect-type optical antenna, including the A, B both ends optical antenna of structure symmetry, every end includes signalling and receiving light path, beacon light emission and trail the light path, and the optical antenna at A, B both ends all launches the different signal light of wavelength and beacon light, receives the signal light and the trail beacon light of opposite end transmission simultaneously. The utility model discloses signal emission light path and signal reception light path alternate segregation, beacon emission light path and beacon tracking light path alternate segregation realize wireless optical communication between both ends and mutual tracking. Compared with the optical antenna integrating receiving and transmitting, the isolation performance is more excellent, and the requirement of the required optical device is reduced; compared with the traditional near-infrared optical antenna, the near-infrared optical antenna is beneficial to reducing the influence of atmosphere on infrared wireless optical communication, increasing the wireless optical signal transmission distance, improving the stability of a communication system and breaking through the application limitation of the near-infrared wireless laser communication technology greatly influenced by atmosphere.
Description
Technical Field
The utility model belongs to the technical field of wireless laser communication, concretely relates to receiving and dispatching disconnect-type optical antenna of infrared wireless optical communication of long wave.
Background
The wireless laser communication is a communication technology for directly transmitting information in space by using laser beams as carriers, and has the outstanding characteristics of large communication capacity, strong anti-interception capability, strong anti-interference capability and the like. In recent years, commercial products for wireless laser communication have been successfully used in the military and civilian sectors. In the wireless laser communication system at the present stage, near-infrared laser with the wavelength of 0.78-1.55 μm is generally adopted as a carrier, the wavelength of the near-infrared laser is short, and the influence of an atmospheric channel on the transmission of the near-infrared laser is serious. This greatly limits the transmission distance and communication performance of the system, and further causes that the near-infrared wireless laser communication system cannot be widely applied. Therefore, how to reduce the influence of the atmosphere on the wireless laser communication system becomes a major research point in this field.
According to the transmission theory of laser in the atmosphere and a large number of external field experiments, the atmospheric influence on the long-wave infrared laser with the wavelength of 8-14 mu m is smaller than that on the near infrared laser. For a long time, the application of long-wave infrared laser to wireless laser communication systems is limited by the maturity of devices, however, with the technological progress, especially the gradual maturity of a series of miniaturized and high-performance long-wave infrared key devices, the long-wave infrared wireless laser communication technology increasingly has practical value.
The existing receiving and transmitting integrated infrared wireless optical communication antenna has poor receiving and transmitting isolation, and the isolation is generally 90dB or even smaller. And the requirements on the main devices such as the color separation sheet, the light source and the like are high, and the types of optical components are required to be increased, so that the cost is higher, and the performance is poor.
In a word, at present, no long-wave infrared wireless optical communication transceiving optical antenna which can meet the practical requirements of long-wave infrared wireless laser communication, has good transceiving isolation and is low in cost exists.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a receiving and dispatching disconnect-type optical antenna of infrared wireless optical communication of long wave, its signalling light path and signal reception light path alternate segregation, beacon transmission light path and beacon tracking light path alternate segregation realize wireless optical communication between both ends and mutual tracking. Compared with an optical antenna integrating receiving and transmitting, the isolation performance is more excellent, the requirement for required optical devices is reduced, the influence of atmosphere on infrared wireless optical communication is favorably reduced, the transmission distance of long-wave infrared wireless optical signals is increased, the isolation of the system is improved, the stability of the communication system is improved, and the application limitation of long-wave infrared wireless laser communication technology which is slightly influenced by atmosphere is broken through.
The utility model discloses a pair of infrared wireless optical communication's of long wave receiving and dispatching disconnect-type optical antenna includes A, B both ends optical antenna of structure symmetry, and the optical antenna of every one end includes signal transmission light path, signal reception light path, beacon transmission light path and beacon tracking light path, and the equal emission wavelength of optical antenna at A, B both ends is the lambdaASignal light of wavelength lambdaBThe signal light and the tracking beacon light emitted by the opposite terminal are simultaneously received.
The utility model discloses wherein one end optical antenna's signal and beacon transmission light path include first light splitter, first lens and second lens, and the center of three is in same straight line, transmits the light path optical axis promptly, and the light aperture ratio that leads to of second lens and first lens is greater than or equal to the focus ratio of the two, the normal of first light splitter and transmission light pathThe optical axis is 45 degrees, and the reflection wavelength of the first light splitter is lambdaASignal light of (2), transmission wavelength is lambdaBThe beacon light of (1). The central line of the signal light beam is 45 degrees and enters the first light splitter, the signal light beam is reflected by the first light splitter and turns 90 degrees, the central line of the signal light beam is coincident with the optical axis of the emission light path, and the entering focal length of the signal light is f1After being focused by the first lens, the lens passes through the focal length f2The second lens collimates the parallel light beam as the signal light emitted from the local terminal. The emergent optical axis of the beacon light source vertically enters the first light splitter and is transmitted by the first light splitter, the central line of the beacon light beam is superposed with the optical axis of the emitting light path, and the entering focal length of the beacon light is f1After being focused by the first lens, the lens passes through the focal length f2The second lens collimates the parallel light beam as the beacon light emitted from the local terminal.
Adjusting the distance between the centers of the first lens and the second lens to be the sum of the focal lengths of the first lens and the second lens, and realizing the emission of a small divergence angle and a large-aperture light beam of signal light;
and adjusting the distance between the beacon light source and the first light splitter to enable the diameter of the beacon light beam to be equal to the clear aperture of the first lens, so that the emission of the beacon light beam with a large aperture is realized.
The signal receiving optical path comprises a third lens, a fourth lens, a second light splitting sheet and a fifth lens, the centers of the third lens, the fourth lens and the second light splitting sheet are in the same straight line, namely the optical axis of the signal receiving optical path is parallel to the optical axis of the transmitting optical path.
The distance between the centers of the third lens and the fourth lens is equal to the sum of the focal lengths of the third lens and the fourth lens, and the light transmission aperture ratio of the third lens and the fourth lens is less than or equal to the focal length ratio of the third lens and the fourth lens; the normal of the second light splitting sheet forms 45 degrees with the optical axis of the receiving light path, and the reflection wavelength of the second light splitting sheet is lambdaAThe optical axis of the reflected signal light of the second light splitting sheet is superposed with the central line of the fifth lens, the signal light received by the third lens is focused by the third lens, then is collimated by the fourth lens, is reflected by the second light splitting sheet, and then is focused on a signal receiving detector by the fifth lens, and the signal detector is connected with a communication system.
A diaphragm is arranged at the confocal position of the third lens and the fourth lens and used for inhibiting stray light;a central wavelength lambda is placed in front of the fifth lensAThe first narrow-band filter of (2) further suppresses background stray light.
The beacon tracking light path comprises a third lens, a fourth lens, a second light splitting sheet and a sixth lens, and the center line of the sixth lens is superposed with the receiving light path and is positioned behind the second light splitting sheet. The beacon light received by the third lens is focused by the third lens, then is collimated by the fourth lens, and is focused on the four-quadrant detector by the sixth lens after being transmitted by the second light splitting sheet, and the four-quadrant detector is connected with a communication system and tracks to provide position information.
A central wavelength lambda is placed in front of the sixth lensBThe second narrow-band filter further inhibits background stray light.
A. The optical antennas at the two ends of the B end have the same structure, and the optical axis of a receiving optical path of the optical antenna at the end B and the optical axis of a transmitting optical path of the optical antenna at the end A are a straight line; the optical axis of a receiving optical path of the A-end optical antenna and the optical axis of a transmitting optical path of the B-end optical antenna are a straight line.
All the light paths are long-wave infrared optical links, and a beacon tracking light path is introduced, so that the stability of the wireless optical communication of the optical antenna is improved.
The second lens and the third lens are hyperboloid lenses so as to reduce the processing and detection difficulty of the large-caliber lens and reduce the cost of the optical antenna.
Wavelength λ of the signal lightAWith the wavelength lambda of the beacon lightBNot equal, by at least 1 μm, to achieve spectral isolation between the signal and the beacon.
Focal length f of the first lens1Is smaller than the focal length f of the second lens2I.e. f2/f1The beam expansion multiple of the two lens combinations is larger than or equal to 10, the energy density at the light emitting opening of the signal and the beacon is reduced, and the use safety of the optical antenna is improved.
Compared with the prior art, the utility model relates to a receiving and dispatching disconnect-type optical antenna of infrared wireless optical communication of long wave's beneficial effect is: 1. the signal transmitting light path and the signal receiving light path are mutually separated light paths, and the beacon transmitting light path and the beacon receiving light path are also mutually separated light paths, so that compared with an integrated antenna, the isolation performance is superior, the isolation degree of the system is greatly improved and is far greater than the isolation degree of the conventional integrated antenna by 90 dB; the utility model has no echo effect of signal emission, and the isolation is close to infinity, thereby greatly improving the stability of the communication system; the application of the long-wave infrared wireless laser communication technology which is slightly influenced by the atmosphere is facilitated; 2. the signal and beacon transmitting light path shares the first light splitting sheet and the first and second lenses, the signal and beacon receiving light path shares the second light splitting sheet and the third and fourth lenses, the volume and the weight of the whole machine are small, and the transmitting caliber and the transmitting angle of the signal and beacon light can be adjusted by adjusting the distance among the light source, the light splitting sheet and the lenses; 3. the requirement standard for optical devices such as the color separation sheet, the light source and the like is reduced, the types of optical components are reduced, the cost is reduced, the antennas at the two ends of A, B can be completely symmetrical, the interchangeability of the components is enhanced, and the subsequent mass production and popularization and application are facilitated.
Drawings
FIG. 1 is a schematic diagram of an optical antenna at one end of an embodiment of a separate optical antenna for transmitting and receiving long-wave infrared wireless optical communication;
FIG. 2 is a schematic diagram of a signal transmitting optical path of an embodiment of a separate optical antenna for transmitting and receiving long-wave infrared wireless optical communication;
FIG. 3 is a schematic diagram of a beacon transmission light path of an embodiment of a separate optical antenna for transmitting and receiving long-wave infrared wireless optical communication;
FIG. 4 is a schematic diagram of a signal receiving optical path of an embodiment of a separate optical antenna for transmitting and receiving long-wave infrared wireless optical communication;
fig. 5 is a schematic diagram of a beacon tracking optical path of an embodiment of a transmitting-receiving split type optical antenna for long-wave infrared wireless optical communication.
The reference numbers in the figures are:
1. the optical fiber signal receiving device comprises a first light splitting sheet, 2, a first lens, 3, a second lens, 4, a third lens, 5, a diaphragm, 6, a fourth lens, 7, a fifth lens, 8, a signal receiving detector, 9, a first narrow-band filter, 10, a second light splitting sheet, 11, a second narrow-band filter, 12, a sixth lens, 13 and a four-quadrant detector.
Detailed Description
In order to make the technical solution of the present invention clearer, the following description is made in detail with reference to the accompanying drawings.
The embodiment of the transmitting-receiving separated optical antenna for long-wave infrared wireless optical communication comprises A, B two-end optical antennas with symmetrical structures, wherein the optical antenna at each end comprises a signal transmitting light path, a signal receiving light path, a beacon transmitting light path and a beacon tracking light path, and the optical antennas at the two ends of A, B all transmit light with the wavelength of lambdaASignal light of wavelength lambdaBThe signal light and the tracking beacon light emitted by the opposite terminal are simultaneously received. The optical axis of a receiving optical path of the B-end optical antenna and the optical axis of a transmitting optical path of the A-end optical antenna are a straight line; the optical axis of a receiving optical path of the A-end optical antenna and the optical axis of a transmitting optical path of the B-end optical antenna are a straight line.
All optical paths in the example are long-wave infrared optical links.
Figure 1 shows a schematic view of the overall structure of an optical antenna at one end,
the dotted line frame above fig. 1 is a signal and beacon transmission light path, and includes a first light splitter 1, a first lens 2, and a second lens 3, and centers of the first light splitter 1, the first lens 2, and the second lens 3 are located on the same straight line, i.e., an optical axis of the transmission light path, as shown by a dotted line in the transmission light path frame above fig. 1. In this example, the first light splitter 1 reflects light with a wavelength λASignal light of 8.2 μm and transmission wavelength λB10.6 μm beacon light. The first lens 2 has a focal length f14mm, clear aperture of 2mm, and focal length f of the second lens 32160mm and 80mm of clear aperture.
As shown in fig. 1, 2 and 3, the second lens element 3 and the first lens element 2 of this example have a ratio of the optical transmission aperture to the focal length of 40. The normal of the first light splitter 1 is at 45 degrees to the optical axis of the emission light path. The central line of the signal light beam is 45 degrees and enters the first light splitter, the signal light beam is reflected by the first light splitter 1 to turn 90 degrees, the central line of the signal light beam is overlapped with the optical axis of the emission light path, and the signal light enters the first lens 2 for focusing and then passes through the second lens 3 to be collimated into a parallel light beam serving as the signal light emitted by the local terminal. The central line of the beacon light beam vertically enters the first light splitter 1 and is transmitted by the first light splitter 1, the central line of the beacon light beam is superposed with the optical axis of the emission light path, and the beacon light enters the first lens 2 for focusing and then is collimated into a parallel light beam through the second lens 3 to be used as the beacon light emitted by the local terminal.
The distance between the centers of the first lens 2 and the second lens 3 is the sum of the focal lengths of the two lenses. The distance between the beacon light source and the first light splitting sheet is adjusted to enable the diameter of the beacon light beam to be just equal to the light transmission aperture of the first lens 2, and large divergence angle and large aperture light beam emission of the beacon light are achieved.
As shown in fig. 1, 4 and 5, the signal receiving optical path includes a third lens 4, a diaphragm 5, a fourth lens 6, a second dichroic filter 10, a first narrow-band filter 9, a fifth lens 7 and a signal receiving detector 8. The centers of the third lens 4, the fourth lens 5 and the second beam splitter 10 are in the same straight line, i.e. the optical axis of the signal receiving optical path, as shown by the dotted line in the receiving optical path frame at the lower part of fig. 1. The optical axis of the signal receiving optical path is parallel to the optical axis of the transmitting optical path.
The second dichroic sheet 10 in this example reflects a wavelength λASignal light of 8.2 μm and transmission wavelength λB10.6 μm beacon light. The third lens 4 has a focal length f3200mm, the clear aperture is 150mm, and the focal length f of the fourth lens 6420mm, clear aperture of 16mm, and focal length f of the fifth lens 7525mm, clear aperture of 16mm, and focal length f of the sixth lens 12625mm, and the clear aperture is 16 mm. The first narrow-band filter 9 has a central wavelength of λAThe central wavelength of the second narrow-band filter 11 is lambdaB。
The distance between the centers of the third lens 4 and the fourth lens 6 is equal to the sum of the focal lengths of the third lens and the fourth lens, the light transmission aperture ratio of the third lens to the fourth lens is 9.4, and the focal length ratio of the third lens to the fourth lens is 10;
the normal of the second light splitting sheet 10 forms 45 degrees with the optical axis of the receiving light path, and the reflection wavelength of the second light splitting sheet 10 is lambdaAThe optical axis of the reflected signal light of the second beam splitter 10 coincides with the center line of the fifth lens 7, the signal light received by the third lens 4 is focused by the signal light, collimated by the fourth lens 6, reflected by the second beam splitter 10, and filtered by the first narrow bandThe sheet 9 filters background stray light, the fifth lens 7 focuses received signal light on the signal receiving detector 8, and the signal detector 8 is connected with a communication system.
In the embodiment, a diaphragm 5 is arranged at the confocal position of the third lens 4 and the fourth lens 6 and is used for inhibiting stray light; a first narrow band filter 9 is placed in front of the fifth lens 7.
The beacon tracking optical path of the embodiment includes a third lens 4, a fourth lens 6, a second beam splitter 10, a second narrow-band filter 11 and a sixth lens 12, and the center lines of the second narrow-band filter 11 and the sixth lens 12 are coincident with the receiving optical path and are behind the second beam splitter 10. The beacon light received by the third lens 4 is focused by the third lens, then is collimated by the fourth lens 6, and after being transmitted by the second dichroic filter 10, background stray light is filtered by the second narrow-band filter 11, and the beacon light is focused on the four-quadrant detector 13 by the sixth lens 12, and the four-quadrant detector 13 is connected with a communication system and tracks to provide position information.
The second lens 3 and the third lens 4 in this example are hyperboloid lenses.
The above embodiments are only specific examples for further detailed description of the objects, technical solutions and advantages of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement and the like made within the scope of the disclosure of the present invention are all included in the protection scope of the present invention.
Claims (9)
1. A long-wave infrared wireless optical communication transceiving separated optical antenna comprises A, B two-end optical antennas with symmetrical structures, the optical antenna at each end comprises a signal transmitting light path, a signal receiving light path, a beacon transmitting light path and a beacon tracking light path, and the optical antennas at the two ends of A, B all transmit light with the wavelength of lambdaASignal light of wavelength lambdaBThe beacon light receives the signal light and the tracking beacon light transmitted by the opposite terminal at the same time; the method is characterized in that:
the signal and beacon emission light path of one end optical antenna comprises a first light splitter (1), a first lens (2) and a second lens (3), the centers of the first light splitter, the first lens and the second lens are in the same straight line, namely the optical axis of the emission light path, and the second lens (3) and the beacon emission light pathThe light transmission aperture ratio of the first lens (2) is more than or equal to the focal length ratio of the first lens and the second lens, the normal of the first light splitter (1) forms 45 degrees with the optical axis of the emission light path, and the reflection wavelength of the first light splitter (1) is lambdaASignal light of (2), transmission wavelength is lambdaBThe beacon light of (1); the central line of the signal light beam is 45 degrees and enters the first light splitting sheet (1), the signal light beam is reflected by the first light splitting sheet (1) to turn 90 degrees, the central line of the signal light beam is superposed with the optical axis of the emission light path, and the focal length of the signal light beam is f1After being focused by the first lens (2), the focal length of the first lens is f2The second lens (3) is collimated into parallel beams as signal light emitted by the local terminal; the central line of the beacon light beam vertically enters the first light splitting sheet (1) and is transmitted by the first light splitting sheet (1), the central line of the beacon light beam is superposed with the optical axis of the emission light path, and the entering focal length of the beacon light is f1After being focused by the first lens (2), the focal length of the first lens is f2The second lens (3) is collimated into a parallel light beam as beacon light emitted by the local terminal;
the signal receiving optical path comprises a third lens (4), a fourth lens (6), a second light splitting sheet (10) and a fifth lens (7), the centers of the third lens (4), the fourth lens (6) and the second light splitting sheet (10) are positioned on the same straight line, namely the optical axis of the signal receiving optical path, and the optical axis of the signal receiving optical path is parallel to the optical axis of the transmitting optical path;
the distance between the centers of the third lens (4) and the fourth lens (6) is equal to the sum of the focal lengths of the third lens and the fourth lens, and the ratio of the light transmission aperture to the aperture of the third lens to the aperture of the fourth lens is less than or equal to the focal length ratio of the third lens to the aperture of the fourth lens; the normal of the second light splitting sheet (10) forms 45 degrees with the optical axis of the receiving light path, and the reflection wavelength of the second light splitting sheet (10) is lambdaAThe optical axis of the reflected signal light of the second light splitting sheet (10) is superposed with the central line of the fifth lens (7), the signal light received by the third lens (4) is focused by the signal light, then is collimated by the fourth lens (6), and is reflected by the second light splitting sheet (10), and then is focused on a signal receiving detector (8) by the fifth lens (7), and the signal receiving detector (8) is connected with a communication system;
the beacon tracking light path comprises a third lens (4), a fourth lens (6), a second light splitting sheet (10) and a sixth lens (12), and the center line of the sixth lens (12) is superposed with the receiving light path and is positioned behind the second light splitting sheet (10); the beacon light received by the third lens (4) is focused by the third lens, then is collimated by the fourth lens (6), and is focused on a four-quadrant detector (13) by the sixth lens (12) after being transmitted by the second light splitting sheet (10), wherein the four-quadrant detector (13) is connected with a communication system;
all the optical paths are long-wave infrared optical links;
A. the optical antennas at the two ends of the B end have the same structure, and the optical axis of a receiving optical path of the optical antenna at the end B and the optical axis of a transmitting optical path of the optical antenna at the end A are a straight line; the optical axis of a receiving optical path of the A-end optical antenna and the optical axis of a transmitting optical path of the B-end optical antenna are a straight line.
2. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
the second lens (3) and the third lens (4) are hyperboloid lenses.
3. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
wavelength λ of the signal lightAWith the wavelength lambda of the beacon lightBNot equal, the difference being at least 1.5 μm.
4. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
a focal length f of the first lens (2)1Is smaller than the focal length f of the second lens (3)2，f2/f1Greater than or equal to 10.
5. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
the distance between the centers of the first lens (2) and the second lens (3) is the sum of the focal lengths of the two lenses.
6. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
the distance between the beacon light source and the first light splitting sheet (1) enables the beacon light beam diameter to be equal to the clear aperture of the first lens (2).
7. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
and a diaphragm (5) is arranged at the confocal position of the third lens (4) and the fourth lens (6).
8. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
a central wavelength lambda is placed in front of the fifth lens (7)AThe first narrow band filter (9).
9. The long-wave infrared wireless optical communication transceiving split optical antenna according to claim 1, wherein:
a central wavelength lambda is arranged in front of the sixth lens (12)BThe second narrowband filter (11).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111313967A (en) * | 2019-12-25 | 2020-06-19 | 中国电子科技集团公司第三十四研究所 | Long-wave infrared wireless optical communication receiving-transmitting separated optical antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313967A (en) * | 2019-12-25 | 2020-06-19 | 中国电子科技集团公司第三十四研究所 | Long-wave infrared wireless optical communication receiving-transmitting separated optical antenna |
| CN111313967B (en) * | 2019-12-25 | 2024-05-28 | 中国电子科技集团公司第三十四研究所 | Receiving-transmitting separated optical antenna for long-wave infrared wireless optical communication |
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