CN110868257B - Wireless optical communication system with double rotating ends - Google Patents
Wireless optical communication system with double rotating ends Download PDFInfo
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- CN110868257B CN110868257B CN201911356386.9A CN201911356386A CN110868257B CN 110868257 B CN110868257 B CN 110868257B CN 201911356386 A CN201911356386 A CN 201911356386A CN 110868257 B CN110868257 B CN 110868257B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 47
- 238000004891 communication Methods 0.000 title claims abstract description 42
- 239000013307 optical fiber Substances 0.000 claims abstract description 35
- 230000008878 coupling Effects 0.000 claims abstract description 27
- 238000010168 coupling process Methods 0.000 claims abstract description 27
- 238000005859 coupling reaction Methods 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000008054 signal transmission Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect 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
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- Optical Couplings Of Light Guides (AREA)
- Optical Communication System (AREA)
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 to generate laser signals to enter a coupling optical fiber. The coupling optical fiber introduces the optical signal into the collimating lens to be changed into parallel light beam, and the parallel light beam is incident to the APD detector which is reflected by the dichroic film and is incident to the opposite end along the direction of the rotating shaft, so that the optical signal is converted into an electric signal, and the electric signal is transmitted to the circuit board of the local end for processing. A. The lasers at the end B respectively generate laser with the wavelength of X, ynm, the two-way color separation film is fixedly arranged on the structural member, the center of the two-way color separation film is positioned on the center line of the rotating shaft, and the surface normal forms an angle of 45 degrees with the center line of the rotating shaft. The dichroic filter at the a end reflects Xnm laser light and transmits the Ynm laser light. The dichroic filter at the B end reflects the laser light at Ynm and transmits the laser light at Xnm. The center line of the rotation shaft of the AB rotation end coincides. The communication distance between two ends of the invention is changed between 5mm and 500mm, thereby realizing reliable high-speed communication.
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 with the double rotating ends.
Background
Some instruments with rotating structures sometimes require that a large amount of information at one rotating end be transferred to the other rotating end. 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 the electric slip ring body is contacted with the electric slip ring contact by adopting a contact type rotary connection method. The connection of the electric slip ring is under the action of contact friction, the abrasion and damage conditions of the electric slip ring body and the electric slip ring contact which are mutually contacted are increasingly serious along with the accumulation of working time, and the communication performance is reduced. The communication reliability of a signal requiring high-speed transmission is also reduced due to an increase in the attenuation coefficient thereof. On the other hand, the electric slip ring is adopted to transmit information, so that the confidentiality is very poor, and the safety cannot be ensured. In addition, the electric slip ring is used for transmitting information, and has poor electromagnetic interference resistance, and particularly under the condition of high-speed rotation at two ends, the electric slip ring cannot perform the work of transmitting signals at high speed.
The optical fiber slip ring has high requirements on the installation condition and the installation precision, such as the axial deviation is not required to exceed tens of micrometers, so the optical fiber slip ring has high cost. 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 outer 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 affected to a certain extent.
Therefore, a connection scheme of dual rotary terminals with long-time reliability, good safety and low cost is needed in wireless optical communication with dual rotary terminals.
Disclosure of Invention
The invention aims to overcome the defects of the technology and design a wireless optical communication system with double rotating ends, wherein both ends of the system comprise a collimating lens, a dichroic filter and other devices for processing an emission beam into a parallel beam, and the emission beam is received by an APD detector at the opposite end, and the central optical axes of the emission signal beam and the received signal beam are coincident with the center of the rotating shaft; the two rotating ends are not influenced by the rotating speed and the distance change between the two rotating ends in the process of signal exchange, and the communication distance between the two rotating ends is 5 mm-500 mm, so that high-speed communication can be realized.
The invention relates to a wireless optical communication system with double rotating ends, which comprises an A rotating end and a B rotating end which are identical in structure, wherein each rotating end A, B comprises a set of circuit board, a laser, a coupling optical fiber, a collimating lens, a dichroic filter, an APD detector and a structural member, the structural member is fixed on the circuit board, and 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 232 signal interface, an Ethernet signal interface and a data interface of a 485 signal interface. For the rotating end A, the laser is fixedly arranged on the circuit board, and a modulation signal generated by the circuit board excites the laser serving as an emitting 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 fiber directs the optical signal into a collimating lens into a parallel beam. The parallel light beam is reflected after being incident on the corresponding dichroic film, the reflected parallel signal light beam is incident on the APD detector of the rotating end B along the direction of the rotating shaft, the APD detector converts the optical signal into an electric signal, and the electric signal is transmitted to the circuit board of 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, X, Y is near the red light wave band, namely 800 nm-1700 nm, and the divergence angle of the light source beam is 6-10 degrees. The a rotating end and the B rotating end emit laser wavelengths X, Y that differ by at least 40nm.
According to practical application conditions, lasers with different emission powers are selected. The laser emission power of the two rotating ends is larger than or equal to 0dBm, the communication distance between the two rotating ends is 5-500 mm, and the wireless optical communication system can realize reliable high-speed communication without changing the distance range. When the communication distance is required to be larger, the high-speed communication with larger communication distance between the two rotating ends can be satisfied by only changing the laser and improving the transmitting power. For example, the transmitting power of the laser is adjusted to be 6dBm, the communication distance between the two rotating ends reaches 700mm, and reliable high-speed communication can be still realized.
The rotation axis center line of the rotation end A coincides with the rotation axis center line of the rotation end B.
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 perpendicular to the central line of the rotating shaft, and the collimated parallel light beam is perpendicular to the central line of the rotating shaft.
The collimating lens is an aspherical mirror, the effective light transmission diameter is Z, the focal length is W, and Z is more than or equal to 2.6mm and less than or equal to 100mm; w is more than or equal to 1.5mm and less than or equal to 200mm.
The collimating lens is an even aspheric surface, and the surface of the collimating lens is a high-order aspheric surface. To obtain better collimation while reducing the occurrence of higher order aberrations.
The dichroic filter is fixedly arranged on the structural member, the center of the dichroic filter is positioned on the center line of the rotating shaft, and the normal line of the surface of the dichroic filter forms an angle of 45 degrees with the center line of the rotating shaft. After the parallel light beam of the emitted light signal is reflected by the dichroic filter, the central optical axis of the parallel light beam coincides with the central line of the rotation shaft.
The two-way color separation film at the rotating end A reflects laser with the wavelength of X nm and transmits laser with the wavelength of Y nm. The dichroic filter 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 filter is an ellipse, and the diameter of the major axis of the ellipse is long a, and the diameter of the minor axis of the ellipse is long b. Major axis diameterThe diameter b of the short axis is more than or equal to Z.
The APD detector is fixed on the circuit board and is connected with related circuits on the circuit board. The photosurface of the APD detector is perpendicular to the axis of rotation. And the center 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 APD detector has a beam receiving field angle of 0-120 deg. when no converging lens is used before. The energy of the signal light received by the APD detector is greater than or equal to the sensitivity requirement of the APD detector for normal operation.
The A rotating end and the B rotating end are respectively provided with a shell fixedly connected with a structural member of the A rotating end, a circuit board of the A rotating end, a laser, a coupling optical fiber, a collimating lens, a dichroic filter, an APD detector and the structural member of the B rotating end are all arranged in the shells of the A rotating end, and the structural member and the shell are provided with windows matched with each other 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 the double rotating ends has the following beneficial effects:
(1) The signal beam emitted by a certain rotating end and the signal beam received by the APD detector are parallel 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 coincident 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 a light spot 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; i.e., the optical energy received by the APD detector is not changed much, and has little influence on signal transmission.
(3) The signal light is incident on the photosensitive surface of the APD detector in a parallel beam, the transmission medium of the signal is air, the optical signal power of the incident photosensitive surface of the APD detector only meets the minimum value required by photoelectric detection of the APD detector, and when the distance between the two rotating ends is changed within the range of 5 mm-500 mm, the system does not need to be changed, and the parallel beam of the signal light vertically falls on the photosensitive surface of the APD detector, so that the light spot area change is extremely small, the energy of the optical signal received by the APD detector can be basically unchanged, the sensitivity requirement of normal work of the APD detector is met, and the high-speed communication between the two rotating ends is ensured.
(4) The wider light beam receiving view field of the APD detector solves the problem of receiving and transmitting failure caused by the deviation of the signal light emission of one rotating end and the signal receiving position of the other rotating end due to rotation, processing and installation precision; the installation flexibility is high, the requirement on the installation precision is low, the axial deviation of 0.5mm can still be communicated normally (the axial deviation requirement of the optical fiber slip ring cannot exceed tens of micrometers), and the scheme has strong adaptability and low total cost.
(5) The information transmission is carried out between the two rotating ends in a non-contact mode, so that various adverse effects caused by contact friction are avoided, and the service life of the electric slip ring is longer than that of the electric slip ring; and under the condition that the rotating end rotates at a high speed, the system can still work normally 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 diagram of an internal structure of an embodiment of a dual-rotation-end wireless optical communication system;
Fig. 2 is a schematic structural diagram of the dual-swivel wireless optical communication system according to the embodiment of the present invention after the housing is installed.
The reference numerals 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 filter, 5, a collimating lens, 6, a coupling optical fiber, 7, a laser, 8 and a shell;
And B, rotating end: ① . Circuit board ②, structural component ③, APD detector ④, dichroic filter ⑤, collimating lens ⑥, coupling optical fiber ⑦, laser ⑧, and housing.
Detailed Description
In order to make the technical scheme of the invention clearer, the invention is further described in detail below by combining the embodiment and the attached 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 box in fig. 1) and a B rotating end (a lower dotted line box in fig. 1) which are identical in 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 filter 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 rotating end a is fixedly connected with the structural member 2 thereof, and the circuit board 1 of the rotating end a, the laser 7, the coupling optical fiber 6, the collimating lens 5, the dichroic filter 4, the APD detector 3 and the structural member 2 are all positioned in the housing 8 thereof, and the structural member 2 and the housing 8 are provided with matched windows to form a signal light channel, and the central line of the signal light channel coincides with the central line of the rotating shaft.
The B rotating end includes a circuit board ①, a laser ⑦, a coupling fiber ⑥, a collimator lens ⑤, a dichroic filter ④, an APD detector ③, and a structural member ②, and the installation connection relationship of the components is the same as that of the a rotating end. The housing ⑧ of the B rotary end is fixedly connected to the structural member ② thereof, and each component of the B rotary end is disposed within the housing ⑧ thereof, and the structural member ② and the housing ⑧ thereof have windows for mating therewith to form a signal light path.
The rotation axis center line of the rotation end A coincides with the rotation axis center line of the rotation end B. The axis of rotation center line is the thick dashed line in the longitudinal center 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 exchanging circuits, and includes a 232 signal interface, an ethernet signal interface and a data interface of a 485 signal interface.
For the rotating end A, three pins of the laser 7 are welded on the circuit board 1, and the modulating signal generated by the circuit board 1 excites the laser 7 serving as an emitting light source to generate a corresponding laser signal, and 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 on the focal plane of the collimating lens, and the coupling optical fiber introduces the optical signal into the collimating lens 5 to become parallel light beams. The parallel light beam is reflected after being incident on the corresponding dichroic filter 4, and the reflected parallel light beam is incident on the APD detector ③ at the rotating end B along the rotation axis direction, and the APD detector ③ converts the optical signal into an electrical signal, and the electrical signal is transmitted to the circuit board ① at the rotating end B for processing. The direction of the light emitted from the axis of rotation a is shown by the thin dotted line in fig. 2.
A circuit board, a laser ⑦, a coupling fiber ⑥, a collimating lens ⑤, a dichroic filter ④, an APD detector and a structure ②,
Circuit board ①, lasers, coupling fibers ⑥, collimating lenses ⑤, dichroic filters, APD detectors ③ and structure ②,
The coupling optical fiber 6 is a single-mode optical fiber in this example, 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 axis of rotation B is shown by the solid line with the arrow in fig. 2.
The laser 7 at the rotating end of this example a produced laser wavelength 1550nm, the laser ⑦ at the rotating end of b produced laser wavelength 1310nm, and the divergence angle of the light source beam was 8 °.
The laser 7 at the two rotating ends in this example has a power of 0dBm and a communication distance between the two rotating ends of 20mm. When the communication distance between the two ends is changed from 5 mm to 500mm, the communication is reliable.
The collimating lens 5 of this example is fixedly mounted on the structure 2 with its central axis perpendicular to the axis of the rotation shaft, and the collimated parallel light beam is perpendicular to the axis of the rotation shaft.
The collimating lens 5 in this example is an even aspheric surface, the effective light-passing diameter is 6.6mm, and the focal length is 9.6mm.
The dichroic filter 4 of this example is fixedly mounted to the structure 2 with its center on the axis of rotation, and the surface normal of the dichroic filter 4 is at a 45 angle to the axis of rotation. After the parallel light beam of the emitted light signal is reflected by the dichroic filter 4, the central optical axis of the parallel light beam coincides with the rotation axis center line.
The dichroic filter 4 at the rotary end of this example a reflects laser light having a wavelength of 1550nm and transmits laser light having a wavelength of 1310 nm. The dichroic filter ④ at the rotating end 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 filter 4, ④ of this example is an ellipse with a major axis diameter of 9.3mm and a minor axis diameter of 6.6mm.
The APD detector 3 of this example is fixed on the circuit board 1 and is connected to the relevant circuitry on the circuit board 1. The photosurface of the APD detector 3 is perpendicular to the axis of rotation. And the center line of the rotating shaft passes through the center of the photosensitive surface; the response wave band of the APD detector 3 of the example is 800 nm-1700 nm. The field angle of the APD detector 3 is 120 °. The energy of the signal light received by the APD detector 3 is greater than or equal to the sensitivity requirement of the APD detector 3 for normal operation.
The above embodiments are merely specific examples for further detailed description of the object, technical solution and advantageous effects of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope of the present disclosure are included in the scope of the present invention.
Claims (9)
1. The utility model provides a wireless optical communication system of two rotatory ends, includes the rotatory end of A and the rotatory end of B that the structure is the same, its characterized in that:
The two rotating ends of A, B comprise a circuit board, a laser, a coupling optical fiber, a collimating lens, a dichroic filter, an APD detector and a structural member; the structural part is fixed on a circuit board, and 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 232 signal interface, an Ethernet signal interface and a plurality of data interfaces of 485 signal interfaces; for the rotating end A, the laser is fixedly arranged on a circuit board, and a modulating signal generated by the circuit board excites the laser serving as an emitting light source to generate a corresponding laser signal which is coupled into a coupling optical fiber from one end of the optical fiber; the coupling optical fiber introduces the optical signal into the collimating lens to become parallel light beams; the parallel light beams are reflected after being incident on the corresponding two-way color separation films, the reflected parallel signal light beams are incident on an APD detector of the rotating end B along the direction of the rotating shaft, the APD detector converts optical signals into electric signals, and the electric signals are transmitted to a circuit board of the rotating end B for processing; for the rotating end B, the optical signal transmission mode is the same as that of the rotating end A;
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 line of the rotating shaft of the rotating end A coincides with the center line of the rotating shaft of the rotating end B;
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 perpendicular to the central line of the rotating shaft, and the collimated parallel light beam is perpendicular to the central line of the rotating shaft;
The two-way color separation film is fixedly arranged on the structural member, the center of the two-way color separation film is positioned on the center line of the rotating shaft, and the normal line of the surface of the two-way color separation film forms an angle of 45 degrees with the center line of the rotating shaft; after the parallel light beam of the emitted light signal is reflected by the dichroic filter, the central optical axis of the parallel light beam coincides with the central line of the rotating shaft;
The two-way color separation piece at the rotating end A reflects laser with the wavelength of Xnm and transmits laser with the wavelength of Ynm; the two-way color separation film at the rotating end B reflects laser with the wavelength of Ynm and transmits laser with the wavelength of Xnm;
The APD detector is fixed on the circuit board and is connected with related circuits on the circuit board; the photosensitive surface of the APD detector is perpendicular to the central line of the rotating shaft; and the center line of the rotating shaft passes through the center of the photosensitive surface;
The laser wavelength X, Y emitted by the rotating end A and the rotating end B are both near the red light wave band, namely 800 nm-1500 nm; the X, Y phase difference is at least 40nm.
2. The dual-rotation-end wireless optical communication system of claim 1, wherein:
the divergence angle of the light source beam is 6-10 degrees.
3. The dual-rotation-end wireless optical communication system of claim 1, wherein:
The laser emission power of the A, B rotating ends is larger than or equal to 0dBm, and the communication distance between the two rotating ends is 5 mm-500 mm.
4. The dual-rotation-end wireless optical communication system of claim 1, wherein:
The collimating lens is an aspherical mirror, the effective light transmission diameter is Z, the focal length is W, and Z is more than or equal to 2.6mm and less than or equal to 100mm; w is more than or equal to 1.5mm and less than or equal to 200mm.
5. The dual-rotation-end wireless optical communication system of claim 4, wherein:
the collimating lens is an even aspheric surface type.
6. The dual-rotation-end wireless optical communication system of claim 4, wherein:
The working area of the dichroic filter is an ellipse, the diameter of the major axis of the ellipse is long a, and the diameter of the minor axis of the ellipse is long b; major axis diameter The diameter b of the short axis is more than or equal to Z.
7. The dual-rotation-end wireless optical communication system of claim 1, wherein:
The response wave band of the APD detector is 800 nm-1700 nm.
8. The dual-rotation-end wireless optical communication system of claim 1, wherein:
the beam receiving field angle of the APD detector is 0-120 degrees when the converging lens is not used before.
9. The dual-rotation-end wireless optical communication system according to any one of claims 1 to 8, wherein:
the A rotating end and the B rotating end are respectively provided with a shell fixedly connected with a structural member of the A rotating end, a circuit board of the A rotating end, a laser, a coupling optical fiber, a collimating lens, a dichroic filter, an APD detector and the structural member of the B rotating end are all arranged in the shells of the A rotating end and the B rotating end, and the structural member and the shells are provided with windows matched with each other to form a signal light channel.
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| CN114900236B (en) * | 2022-07-15 | 2022-09-27 | 中北大学 | Line-of-sight space optical bidirectional communication system and method based on BOSA |
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| CN107947860A (en) * | 2017-12-12 | 2018-04-20 | 长春理工大学 | The energy of full-duplex communication and information combined Transmission system are realized based on fiber-optic vibration |
| 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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