CN110868257A - Wireless optical communication system with double rotating ends - Google Patents
Wireless optical communication system with double rotating ends Download PDFInfo
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- CN110868257A CN110868257A CN201911356386.9A CN201911356386A CN110868257A CN 110868257 A CN110868257 A CN 110868257A CN 201911356386 A CN201911356386 A CN 201911356386A CN 110868257 A CN110868257 A CN 110868257A
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- 238000004891 communication Methods 0.000 title claims abstract description 43
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- 230000008878 coupling Effects 0.000 claims abstract description 27
- 238000010168 coupling process Methods 0.000 claims abstract description 27
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- 238000000926 separation method Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
Abstract
The invention relates to a wireless optical communication system with double rotating ends, which comprises A, B rotating ends with the same structure, wherein a laser is fixedly arranged on a circuit board, and the circuit board controls the laser signal generated by the laser to enter a coupling optical fiber. The coupling optical fiber leads the optical signal into the collimating lens to be converted into a parallel light beam, the parallel light beam is incident to the dichroic splitter and reflected to be incident to the APD detector at the opposite end along the direction of the rotating shaft, the optical signal is converted into an electric signal, and the electric signal is transmitted to the circuit board at the local end to be processed. A. The lasers at the B end respectively generate lasers with the wavelength of X, Ynm, the dichroic filters are fixedly arranged on the structural member, the centers of the dichroic filters are positioned on the center line of the rotating shaft, and the surface normal and the center line of the rotating shaft form an angle of 45 degrees. The dichroic sheet at the a end reflects Xnm laser light and transmits Ynm laser light. The dichroic sheet at the B-end reflects the laser light at the y nm and transmits the laser light at Xnm. The center lines of the rotating shafts of the AB rotating ends are coincident. The invention can realize reliable high-speed communication when the communication distance between two ends is changed between 5mm and 500 mm.
Description
Technical Field
The invention relates to the technical field of wireless optical communication, in particular to a wireless optical communication system with double rotating ends, which realizes non-contact real-time optical communication of the double rotating ends.
Background
Some instruments with rotating structures sometimes need to transmit a large amount of information from one rotating end to the other. The traditional method mainly adopts an electric slip ring or an optical fiber slip ring to connect two rotating ends. The electric slip ring is mainly used for transmitting electric signals, and a contact type rotary connection method is adopted, so that the electric slip ring body is in contact with an electric slip ring contact. Due to the action of contact friction, the abrasion and damage of the electrical slip ring bodies and the electrical slip ring contacts which are in contact with each other are increasingly serious along with the accumulation of working time, and the communication performance is reduced. For signals that need to be transmitted at high speed, the communication reliability is also reduced due to an increase in the attenuation coefficient. On the other hand, the electrical slip ring is adopted to transmit information, so that the confidentiality is very poor, and the safety cannot be guaranteed. In addition, the electric slip ring is adopted to transmit information, the anti-electromagnetic interference capability of the electric slip ring is poor, and particularly under the condition of high-speed rotation at two ends, the electric slip ring cannot be used for transmitting signals at a high speed.
The requirements of the optical fiber slip ring on the installation condition and the installation precision are high, for example, the requirement of axial deviation does not exceed dozens of micrometers, so the cost of the optical fiber slip ring is high. And after the optical fiber slip ring product leaves the factory, the structure is fixed, the distance between the two rotating ends is fixed by the external structure of the optical fiber slip ring, and the distance between the two rotating ends is difficult to adjust, so that the use of the optical fiber slip ring is influenced to a certain extent.
Therefore, a connection scheme of the double-rotating-end with long-time reliable signal transmission, good safety and low cost is needed in the wireless optical communication of the double-rotating-end.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the technology and designs a wireless optical communication system with double rotating ends, wherein both ends of the system comprise devices such as a collimating lens and a dichroic splitter and the like to process emitted light beams into parallel light beams which are received by an APD detector at the opposite end, and the central optical axes of the emitted signal light beams and the received signal light beams are coincided with the center of a rotating shaft; the two rotating ends are not influenced by rotating speed and distance change between the two rotating ends in the process of exchanging signals, and the communication distance between the two rotating ends is 5-500 mm, so that high-speed communication can be realized.
The invention designs a wireless optical communication system with double rotating ends, which comprises an A rotating end and a B rotating end which have the same structure, wherein A, B two rotating ends respectively comprise a set of circuit board, a laser, a coupling optical fiber, a collimating lens, a dichroic splitter, an APD detector and a structural component, the structural component is fixed on the circuit board, the circuit board integrates a plurality of circuits, comprises a laser driving circuit, an optical signal receiving circuit, a signal processing circuit and other data exchange circuits, and comprises a data interface of a 232 signal interface, an Ethernet signal interface and a 485 signal interface. And for the A rotating end, the laser is fixedly arranged on the circuit board, and the modulation signal generated by the circuit board excites the laser serving as a transmitting light source to generate a corresponding laser signal which is coupled into the coupling optical fiber from one end of the optical fiber. The coupling optical fiber guides the optical signal into the collimating lens to become a parallel light beam. The parallel light beams are incident to the corresponding dichroic split color chips and then reflected, the reflected parallel signal light beams are incident to an APD detector at the rotating end B along the direction of a rotating shaft, the APD detector converts optical signals into electric signals, and the electric signals are transmitted to a circuit board at the rotating end B for processing. For the B rotating end, the optical signal transmission mode is the same as that of the A rotating end.
The laser wavelength generated by the laser at the rotating end A is X nm, the laser wavelength generated by the laser at the rotating end B is Ynm, X, Y are all positioned near a red light wave band, namely 800 nm-1700 nm, and the divergence angle of the light beams of the light source is 6-10 degrees. The laser wavelength X, Y emitted by the A rotating end and the B rotating end has a difference of at least 40 nm.
According to the practical application condition, lasers with different transmitting powers are selected. The transmitting power of the lasers at the two rotating ends is larger than or equal to 0dBm, the communication distance between the two rotating ends is 5 mm-500 mm, and the wireless optical communication system can realize reliable high-speed communication without changing within the distance range. When the communication distance is required to be larger, high-speed communication with larger communication distance between the two rotating ends can be met only by replacing the laser and improving the transmitting power. For example, the transmitting power of the laser is adjusted to 6dBm, and the communication distance between the two rotating ends reaches 700mm, so that reliable high-speed communication can be realized.
The center lines of the rotating shafts of the A rotating end and the B rotating end are superposed.
The coupling optical fiber is a single mode optical fiber, and the end face of the output end of the coupling optical fiber is fixed on the focal plane of the collimating lens.
The collimating lens is fixedly arranged on the structural member, the central axis of the collimating lens is vertical to the central line of the rotating shaft, and the collimated parallel light beams are vertical to the central line of the rotating shaft.
The collimating lens is an aspheric lens, the effective light passing diameter of the collimating lens is Z, the focal length of the collimating lens is W, and Z is more than or equal to 2.6mm and less than or equal to 100 mm; w is more than or equal to 1.5mm and less than or equal to 200 mm.
The collimating lens is of an even-order aspheric surface type, and the surface of the collimating lens is of a high-order aspheric surface. To obtain better collimation while reducing the occurrence of higher order aberrations.
The dichroic color separation sheet is fixedly arranged on the structural member, the center of the dichroic color separation sheet is positioned on the center line of the rotating shaft, and the surface normal of the dichroic color separation sheet and the center line of the rotating shaft form an angle of 45 degrees. After parallel light beams of the emitted optical signals are reflected by the dichroic color separation sheet, the central optical axis of the parallel light beams is coincided with the central line of the rotating shaft.
The dichroic color separation sheet at the rotating end A reflects laser with the wavelength of X nm and transmits laser with the wavelength of Y nm. The dichroic color separation sheet at the rotating end B reflects laser with the wavelength of Y nm and transmits laser with the wavelength of X nm.
The working area of the dichroic color separation film is an ellipse, the major axis of the ellipse has a diameter length a, and the minor axis of the ellipse has a diameter length b. Major axis diameter
Minor axis diameterb≥Z。
The APD detector is fixed on the circuit board and is connected with the related circuit on the circuit board. The photosensitive surface of the APD detector is perpendicular to the center line of the rotating shaft. And the central line of the rotating shaft passes through the center of the photosensitive surface; the response wave band of the APD detector is 800 nm-1700 nm. The receiving field angle of the light beam of the APD detector is 0-120 degrees when the APD detector does not adopt a convergent lens in front. The light energy of the signal received by the APD detector is more than or equal to the sensitivity requirement of the normal work of the APD detector.
The rotating end A and the rotating end B are respectively provided with a shell fixedly connected with a structural member of the rotating end A, the circuit board and the laser, the coupling optical fiber, the collimating lens, the dichroic color separation sheet, the APD detector and the structural member of the rotating end B are all arranged in the shell of the rotating end A, and the structural member and the shell are provided with matched windows to form a signal light channel so as to facilitate the emission and the reception of signal light between the two rotating ends.
Compared with the prior art, the wireless optical communication system with double rotating ends has the following beneficial effects:
(1) the signal light beam emitted from a certain rotating end and the signal light beam received by the APD detector are parallel light beams with the optical axis coincident with the central line of the rotating shaft, so that the space of the whole wireless optical communication system is fully utilized, and the miniaturization of the system is facilitated;
(2) the center of the APD detector is superposed with the optical axis of the parallel signal light, and the parallel signal light vertically enters the photosensitive surface of the APD detector, so that the light intensity of light spots on the photosensitive surface of the APD detector tends to be stable and unchanged without being influenced by the rotating speed of the rotating mechanism in the process of information exchange between the two rotating ends; namely, the APD detector receives light energy with little change and has little influence on signal transmission.
(3) The system has the advantages that the signal light is incident on the photosensitive surface of the APD detector in a parallel light beam mode, the transmission medium of the signal is air, the power of the light signal incident on the photosensitive surface of the APD detector only needs to meet the minimum value required by photoelectric detection of the APD detector, and when the distance between the two rotating ends changes within the range of 5 mm-500 mm, the system does not need to be changed at all.
(4) The wider light beam receiving field of view of the APD detector solves the problem of receiving and transmitting failures such as signal light emission of a certain rotating end and signal receiving position deviation of the other rotating end caused by rotation, processing and installation accuracy; the installation flexibility is larger, the requirement on the installation precision is not high, normal communication can still be realized even if the axial deviation is 0.5mm (the axial deviation of the optical fiber slip ring is required to be not more than dozens of micrometers), the scheme has stronger adaptability and lower total cost.
(5) According to the scheme, the information is transmitted between the two rotating ends in a non-contact mode, various adverse effects caused by contact friction are avoided, and therefore the service life of the electric slip ring is much longer than that of the electric slip ring; and the system can still work normally under the condition that the rotating end rotates at a high speed, and has strong anti-interference capability, so the system has lower use and maintenance cost and good environment adaptability.
Drawings
Fig. 1 is a schematic internal structure diagram of an embodiment of the present dual-rotation-end wireless optical communication system;
fig. 2 is a schematic structural diagram of the wireless optical communication system with two rotating ends after the housing is installed in the embodiment.
The reference numbers in the figures are:
a, rotating end: 1. the device comprises a circuit board, 2, a structural member, 3, an APD detector, 4, a dichroic split sheet, 5, a collimating lens, 6, a coupling optical fiber, 7, a laser, 8 and a shell;
①, a circuit board, ②, a structural member, ③, an APD detector, ④, a dichroic splitter, ⑤, a collimating lens, ⑥, a coupling optical fiber, ⑦, a laser, ⑧ and a shell.
Detailed Description
In order to make the technical scheme of the invention clearer, the invention is further described in detail with reference to the following embodiments and the accompanying drawings.
The internal structure of the embodiment of the wireless optical communication system with double rotating ends is shown in fig. 1, and comprises an a rotating end (an upper dotted line frame in fig. 1) and a B rotating end (a lower dotted line frame in fig. 1) which have the same structure, wherein the a rotating end comprises a circuit board 1, a laser 7, a coupling optical fiber 6, a collimating lens 5, a dichroic splitter 4, an APD detector 3 and a structural member 2, and the structural member 2 is fixed on the circuit board 1. As shown in the upper half of fig. 2, the housing 8 of the rotation end a is fixedly connected to the structural member 2 thereof, the circuit board 1 of the rotation end a, the laser 7 thereof, the coupling fiber 6, the collimating lens 5, the dichroic splitter 4, the APD detector 3, and the structural member 2 are all located within the housing 8 thereof, the structural member 2 and the housing 8 have matching windows to form a signal light channel, and the center line of the signal light channel coincides with the center line of the rotation axis.
The B rotating end comprises a circuit board ①, a laser ⑦, a coupling optical fiber ⑥, a collimating lens ⑤, a dichroic splitter ④, an APD detector ③ and a structural member ⑦ 0, the components are mounted and connected in the same relation as the A rotating end, a housing ⑦ 1 of the B rotating end is fixedly connected with the structural member ② of the B rotating end, the components of the B rotating end are all positioned in a housing ⑧ of the B rotating end, and the structural member ② and the housing ⑧ of the B rotating end are provided with matched windows to form a signal light channel.
The center lines of the rotating shafts of the A rotating end and the B rotating end are superposed. The rotation axis centerline is the longitudinal center heavy dashed line in fig. 1 and 2.
The circuit board 1 integrates a plurality of circuits including a laser driving circuit, an optical signal receiving circuit, a signal processing circuit and other data exchange circuits, and includes data interfaces of a 232 signal interface, an ethernet signal interface and a 485 signal interface.
For the rotating end a, three pins of the laser 7 are soldered to the circuit board 1, the modulation signal generated by the circuit board 1 excites the laser 7 as the emitting light source to generate a corresponding laser signal, the corresponding laser signal is coupled into the coupling optical fiber 6 from one end of the coupling optical fiber, the end face of the output end of the coupling optical fiber 6 is fixed to the focal plane of the collimating lens, the coupling optical fiber introduces the optical signal into the collimating lens 5 to be converted into a parallel light beam, the parallel light beam is incident on the corresponding dichroic splitter 4 and then reflected, the reflected parallel light beam is incident on the APD detector ③ at the rotating end B along the rotating shaft direction, the APD detector ③ converts the optical signal into an electrical signal, the electrical signal is transmitted to the circuit board ① at the rotating end B to be processed, and the direction of the light emitted.
A circuit board, a laser ⑦, a coupling fiber ⑥, a collimating lens ⑤, a dichroic splitter ④, an APD detector, and a structural member ②,
the coupling optical fiber 6 in this example is a single mode optical fiber, the end face of the output end of the coupling optical fiber 6 is fixed on the focal plane of the collimating lens 5 through a flange, and the flange is fixed on the structural member 2.
For the B rotating end, the optical signal transmission mode is the same as that of the A rotating end. The direction of the light emitted from the B rotating shaft is shown by the solid line with an arrow in fig. 2.
In this example, the laser 7 at the rotating end of the example A generates a laser wavelength of 1550nm, the laser ⑦ at the rotating end of the example B generates a laser wavelength of 1310nm, and the divergence angle of the source beam is 8 deg..
In this example, the laser 7 at both ends of rotation has a transmission power of 0dBm, and the communication distance between the two ends of rotation is 20 mm. When the communication distance between the two ends is changed within 5-500 mm, the communication is reliable.
The collimating lens 5 is fixedly arranged on the structural member 2, the central axis of the collimating lens is vertical to the central line of the rotating shaft, and the collimated parallel light beams are vertical to the central line of the rotating shaft.
The collimating lens 5 of this example is an even-order aspheric surface type, and has an effective light-passing diameter of 6.6mm and a focal length of 9.6 mm.
The dichroic split color chip 4 of this example is fixedly mounted on the structure 2 with its center on the center line of the rotation axis, and the surface normal of the dichroic split color chip 4 makes an angle of 45 ° with the center line of the rotation axis. After the parallel light beams of the emitted light signals are reflected by the dichroic splitter 4, the central optical axis of the parallel light beams coincides with the central line of the rotating shaft.
In this example, the dichroic filter 4 at the rotating end of B reflects laser light with a wavelength of 1310nm and transmits laser light with a wavelength of 1550nm, and the dichroic filter ④ at the rotating end of B reflects laser light with a wavelength of 1310nm and transmits laser light with a wavelength of 1550 nm.
The working area of the dichroic beamsplitter 4, ④ of this example is an ellipse with a major axis 9.3mm in diameter and a minor axis 6.6mm in diameter.
The APD detector 3 of this example is fixed to the circuit board 1 and is connected to the associated circuitry on the circuit board 1. The photosensitive surface of the APD detector 3 is perpendicular to the rotation axis centerline. The central line of the rotating shaft passes through the center of the photosensitive surface; the response wave band of the APD detector 3 is 800 nm-1700 nm. The field angle of the APD detector 3 is 120 °. The signal light energy received by the APD detector 3 is not less than the sensitivity requirement of the APD detector 3 for normal operation.
The above-described embodiments are only specific examples for further explaining the object, technical solution and advantageous effects of the present invention in detail, 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 included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a wireless optical communication system of two rotating ends, includes the same A rotating end of structure and B rotating end, its characterized in that:
the A, B two rotating ends respectively comprise a circuit board, a laser, a coupling optical fiber, a collimating lens, a dichroic splitter, an APD detector and a structural member; the structure is fixed on the circuit board, the circuit board integrates a plurality of circuits, including a laser driving circuit, an optical signal receiving circuit, a signal processing circuit and other data exchange circuits, and comprises a plurality of data interfaces including a 232 signal interface, an Ethernet signal interface and a 485 signal interface; for the rotating end A, the laser is fixedly arranged on the circuit board, and the modulation signal generated by the circuit board excites the laser serving as a transmitting light source to generate a corresponding laser signal which is coupled into the coupling optical fiber from one end of the optical fiber; the coupling optical fiber introduces the optical signal into the collimating lens to become a parallel light beam; the parallel light beams are incident to the corresponding dichroic filters and then reflected, the reflected parallel signal light beams are incident to an APD detector at the rotating end B along the direction of a rotating shaft, the APD detector converts optical signals into electric signals, and the electric signals are transmitted to a circuit board at the rotating end B for processing; for the B rotating end, the optical signal transmission mode is the same as that of the A rotating end;
the laser wavelength generated by the laser at the rotating end A is X nm, the laser wavelength generated by the laser at the rotating end B is Y nm,
the center lines of the rotating shafts of the rotating end A and the rotating end B are overlapped;
the coupling optical fiber is a single-mode optical fiber, and the end face of the output end of the coupling optical fiber is fixed on the focal plane of the collimating lens;
the collimating lens is fixedly arranged on the structural member, the central axis of the collimating lens is vertical to the central line of the rotating shaft, and the collimated parallel light beams are vertical to the central line of the rotating shaft;
the dichroic color separation sheet is fixedly arranged on the structural member, the center of the dichroic color separation sheet is positioned on the central line of the rotating shaft, and the surface normal of the dichroic color separation sheet and the central line of the rotating shaft form an angle of 45 degrees; after parallel light beams of the emitted optical signals are reflected by the dichroic color separation sheet, the central optical axis of the parallel light beams is superposed with the central line of the rotating shaft;
the dichroic color separation sheet at the rotating end A reflects laser with the wavelength of Xnm and transmits laser with the wavelength of Ynm; the dichroic color separation sheet at the rotating end B reflects laser with the wavelength of Ynm and transmits laser with the wavelength of X nm;
the APD detector is fixed on the circuit board and is connected with a related circuit on the circuit board; the photosensitive surface of the APD detector is vertical to the central line of the rotating shaft; and the center line of the rotating shaft passes through the center of the photosensitive surface.
2. The dual-rotation-end wireless optical communication system according to claim 1, wherein:
the divergence angle of the light beams of the light source is 6-10 degrees.
3. The dual-rotation-end wireless optical communication system according to claim 1, wherein:
the laser wavelength X, Y emitted by the rotating end A and the rotating end B is near the red light wave band, namely 800 nm-1500 nm; the X, Y differ by at least 40 nm.
4. The dual-rotation-end wireless optical communication system according to claim 1, wherein:
the emitting power of the laser at the two rotating ends of A, B is greater than or equal to 0dBm, and the communication distance between the two rotating ends is 5 mm-500 mm.
5. The dual-rotation-end wireless optical communication system according to claim 1, wherein:
the collimating lens is an aspheric lens, the effective light passing diameter of the collimating lens is Z, the focal length of the collimating lens is W, and Z is more than or equal to 2.6mm and less than or equal to 100 mm; w is more than or equal to 1.5mm and less than or equal to 200 mm.
6. The dual-rotation-end wireless optical communication system according to claim 5, wherein:
the collimating lens is of an even-order aspheric surface type.
7. The dual-rotation-end wireless optical communication system according to claim 5, wherein:
the working area of the dichroic color separation film is an ellipse, the major axis of the ellipse has a diameter length a, and the minor axis of the ellipse has a diameter length b; major axis diameter
The diameter b of the minor axis is more than or equal to Z.
8. The dual-rotation-end wireless optical communication system according to claim 1, wherein:
the response wave band of the APD detector is 800 nm-1700 nm.
9. The dual-rotation-end wireless optical communication system according to claim 1, wherein:
when the APD detector does not adopt a convergent lens before, the receiving field angle of the light beam is 0-120 degrees.
10. The dual-rotation-end wireless optical communication system according to any one of claims 1 to 9, wherein:
the rotating end A and the rotating end B are respectively provided with a shell fixedly connected with a structural member thereof, the circuit board and the laser thereof, the coupling optical fiber, the collimating lens, the dichroic splitter, the APD detector and the structural member thereof at the end are all positioned in the shell thereof, and the structural member and the shell are provided with matched windows to form a signal light channel.
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| CN114900236A (en) * | 2022-07-15 | 2022-08-12 | 中北大学 | Line-of-sight space optical bidirectional communication system and method based on BOSA |
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| CN109324376A (en) * | 2018-11-05 | 2019-02-12 | 中航海信光电技术有限公司 | A kind of coaxial spaces light transmitting-receiving communication device |
| CN210670082U (en) * | 2019-12-25 | 2020-06-02 | 中国电子科技集团公司第三十四研究所 | Wireless optical communication system with double rotating ends |
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