CN113328803A - Laser beam expanding wireless optical communication system based on engineering diffuser and ground glass scattering sheet - Google Patents
Laser beam expanding wireless optical communication system based on engineering diffuser and ground glass scattering sheet Download PDFInfo
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- CN113328803A CN113328803A CN202011185715.0A CN202011185715A CN113328803A CN 113328803 A CN113328803 A CN 113328803A CN 202011185715 A CN202011185715 A CN 202011185715A CN 113328803 A CN113328803 A CN 113328803A
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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
- H04B10/40—Transceivers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
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Abstract
The invention provides a laser beam expanding wireless optical communication system based on an engineering diffuser and a ground glass scattering sheet, and relates to the technical field of optical information. At present, a laser and a light emitting diode are generally adopted as communication light sources in a wireless optical communication system, but the two schemes cannot give consideration to long-distance and high-speed data transmission and convenient link alignment. In the scheme provided by the invention, when the loss of the communication link is low, the engineering diffuser is adopted to expand the light beam, so that the large-angle coverage of the light beam can be realized, and the link alignment requirement is reduced to the greatest extent. When the loss of the communication link is high, the ground glass scattering sheet is adopted to carry out small-angle beam expansion on the light beam, so that high-speed low-error transmission in a small-angle range can be realized. Compared with other link alignment solutions, the link alignment method has the advantages of simple structure, low cost, flexibility in use, high stability and the like, and has good application prospects in the fields of free space optical communication, underwater wireless optical communication and the like.
Description
Description
Technical Field
The invention relates to a communication method using expanded beam laser as a carrier light source of a Free Space Optical (FSO) communication system and an Underwater Wireless Optical Communication (UWOC) system, belonging to the technical field of optical information.
Background
The wireless optical communication technology is a novel communication technology, and has the advantages of mobile communication and optical fiber communication, such as flexible networking, high broadband, electromagnetic interference resistance, no need of frequency application, good confidentiality and the like. And with the deep exploration and development of human beings on the outer space, the atmospheric space and the ocean, the establishment of an air-sea wireless optical communication network based on a free space optical communication technology and an underwater wireless optical communication technology is urgent.
The communication light sources adopted by the existing free space optical communication system and underwater wireless optical communication system are mainly laser and Light Emitting Diode (LED). The laser has the characteristics of high emission power, good collimation, high bandwidth, concentrated energy, narrow line width and the like, is suitable for a long-distance and high-speed wireless optical communication application scene, and is difficult to align due to small light spots. While LEDs have a large divergence angle, reducing link alignment requirements to some extent, but they are power dispersive, have close transmission distances, and have low modulation bandwidths. Therefore, it is a goal pursued by wireless optical communication systems to obtain a communication light source having both a large coverage area and a high modulation bandwidth. The current technical scheme aiming at the problem mainly comprises the following two types: 1. commercial high-speed LEDs are used as modulation light sources, and nonlinear adaptive filters are used for compensating nonlinear loss of the light sources. 2. A Vertical Cavity Surface Emitting Laser (VCSEL) with a large beam coverage angle is used as a communication light source. 3. The radius of the spot is expanded by a beam expander. Scheme 1 uses high speed LEDs to increase the modulation rate of the LED light source, but the use of filters also introduces associated noise. Commercial solutions represented by solutions 1 and 2 are usually packaged as a whole, and thus are difficult to adapt according to different scenes. The beam expander in scheme 3 adopts a composite lens group, and the loss on a space link caused by the composite lens group is too large, so that the requirement of long-distance transmission is difficult to meet. The optical scattering sheet has a compact structure, and the optical scattering sheet such as an engineering diffuser and a ground glass scattering sheet is very competitive in practical application by adopting a laser.
Disclosure of Invention
The invention provides a laser beam expanding wireless optical communication system based on an Engineering Diffuser (ED) and a ground glass scattering sheet (GGD) in order to solve the alignment problem of the existing high-speed wireless optical communication, and the alignment requirement of the high-speed wireless optical communication system can be reduced by adopting a simpler and more flexible mode.
The laser beam expanding wireless optical communication system based on the engineering diffuser and the ground glass scattering sheet comprises signal transmitting equipment (1), an electric amplifier (2), an electric attenuator (3), a laser diode (4), the engineering diffuser (5)/the ground glass scattering sheet (6), a plano-convex lens (7), an avalanche photodetector (8), an oscilloscope (9) and a computer (10);
the device is characterized in that the output end of a signal emitting device (1) is connected with the input end of an amplifier (2) through a cable, the output end of the amplifier (2) is connected with the input end of an electric attenuator (3) through a cable, the output end of the electric attenuator (3) is connected with the electric input end of a laser diode (4) through a cable, an engineering diffuser 5/a ground glass scattering sheet (6) is placed behind the laser diode (4) and used for expanding carrier optical signals emitted by the laser diode (4), a plano-convex lens (7) is placed in front of an avalanche photodetector (8) and used for focusing optical signals transmitted through a channel into a detection aperture of the avalanche photodetector (8), the avalanche photodetector (8) is connected with the input end of an oscilloscope (9) through a cable, and the oscilloscope (9) is connected with a computer (10) through a data line. The signal waveform can be observed from the oscilloscope (9), and the computer (10) is used for analyzing the sampling data of the oscilloscope (9) so as to measure the communication effect.
The signal transmitting device (1) is preferably any signal generator or error detector.
The preferred amplification power of the electrical amplifier (2) is 10 dBm.
The central wavelength of the laser diode (4) is 520nm, the output power is preferably 35mW, the laser diode is provided with an E-shaped pin, a single-mode fiber pigtail is provided, and the connection mode tail FC/PC is provided.
The engineering diffuser (5) is 1 inch in diameter, the light beam scattering angle is 20 degrees, the engineering diffuser is installed in an SM1 threaded (1.035 inch-40) installation seat, the ground glass scattering sheet (6) is 1 inch in diameter, the engineering diffuser is installed in an SM1 threaded (1.035 inch-40) installation seat, the engineering diffuser is made of N-BK7 ground glass, and the roughness is 1500 meshes.
The diameter of the plano-convex lens is preferably 10 cm.
The detection wavelength of the avalanche photodetector (8) is 400nm-1000nm, the 3dB bandwidth is 5MHz-1000MHz, and the detection aperture is 0.5 mm.
The invention has the beneficial effects that: according to the invention, the laser diode (4) and the engineering diffuser (5)/the ground glass scattering sheet (6) are combined, so that the beam expansion of a high-speed communication light source is realized, and the link alignment requirement is reduced. Compared with the traditional light beam expanding scheme, the invention has simple structure and low cost, and can flexibly switch the type of the scattering sheet according to the requirement of the receiving end surface on the light beam divergence angle. When the communication link loss is low, the engineering diffuser (5) can be adopted to expand the light beam, so that the large-angle coverage of the light beam is realized, and the link alignment requirement is reduced to the maximum extent. When the loss of a communication link is high, the ground glass scattering sheet (6) can be adopted to expand the beam at a small angle, the beam expansion angle of the ground glass scattering sheet (6) is small, but the optical power is more concentrated, and high-speed low-error-code transmission in a small-angle range can be realized.
The invention has the advantages of simple structure, low cost, flexible use and high stability, and has better application prospect in the fields of free space optical communication, underwater wireless optical communication and the like.
Drawings
Fig. 1 is a schematic structural diagram of a laser beam expanding wireless optical communication system based on an engineering diffuser and a ground glass scattering sheet.
Fig. 2 is a relationship between the error rate and the peak-to-peak value of the detector response voltage and the beam divergence angle after the communication system of the present invention is transmitted in a 2m long air channel.
Fig. 3 is a relationship between the bit error rate and the peak-to-peak value of the detector response voltage and the beam divergence angle after the communication system of the present invention is transmitted in a 2m tap water channel.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in figure 1, the laser beam expanding wireless optical communication system based on the engineering diffuser and the ground glass scattering sheet comprises a signal transmitting device (1), an electric amplifier (2), an electric attenuator (3), a laser diode (4), the engineering diffuser (5)/the ground glass scattering sheet (6), a plano-convex lens (7), an avalanche photodetector (8), an oscilloscope (9) and a computer (10).
The output end of the signal transmitting device (1) is connected with the input end of the amplifier (2) through a cable, the output end of the amplifier (2) is connected with the input end of the electric attenuator (3) through a cable, the output end of the electric attenuator (3) is connected with the electric input end of the laser diode (4) through a cable, the engineering diffuser (5)/the ground glass scattering sheet (6) is placed behind the laser diode (4) and used for expanding the carrier optical signal transmitted by the laser diode (4), the plano-convex lens (7) is placed in front of the avalanche photodetector (8) and focuses the optical signal transmitted through a channel into the detection aperture of the avalanche photodetector (8), the avalanche photodetector (8) is connected with the input end of the oscilloscope (9) through a cable, and the oscilloscope (9) is connected with the computer (10) through a data line. The signal waveform can be observed from the oscilloscope (9), and the computer (10) is used for analyzing the sampling data of the oscilloscope (9) so as to measure the communication effect.
The signal transmitting device (1) is preferably any signal generator or error detector.
The preferred maximum amplification power of the electrical amplifier (2) is 10 dBm.
The central wavelength of the laser diode (4) is 520nm, the output power is preferably 35mW, the laser diode is provided with an E-shaped pin, a single-mode fiber pigtail is provided, and the connection mode tail FC/PC is provided.
The engineering diffuser (5) is 1 inch in diameter, the light beam scattering angle is 20 degrees, the engineering diffuser is installed in an SM1 threaded (1.035 inch-40) installation seat, the ground glass scattering sheet (6) is 1 inch in diameter, the engineering diffuser is installed in an SM1 threaded (1.035 inch-40) installation seat, the engineering diffuser is made of N-BK7 ground glass, and the roughness is 1500 meshes.
The detection wavelength of the avalanche photodetector (8) is 400nm-1000nm, the 3dB bandwidth is 5MHz-1000MHz, and the detection aperture is 0.5 mm.
And (3) starting the laser diode (4), and adjusting the emergent light power of the laser diode (4) to be maximum within the linear working range of 30-90 mA. Adjusting a signal transmitting device (1) to transmit an on-off keying pseudo-random binary sequence signal with the speed of 1Gb/s, adjusting the electric amplifier after the signal enters an electric amplifier (2) to amplify the power of an output signal to 10dBm, then enabling the signal to enter an electric attenuator (3), adjusting the electric attenuator (3) to enable the voltage peak value of an emergent electric signal to be 3V, and finally loading the attenuated electric signal onto an electrode of a laser diode (4) to finish the electro-optical modulation process of the signal. The modulated carrier optical signal is expanded by an engineering diffuser (5) or a ground glass scattering sheet (6) and then is incident into a channel for transmission. After being transmitted by a channel, the carrier optical signal is collected by a plano-convex lens (7) with the diameter of 10cm at a receiving end and focused on a receiving aperture of an avalanche photodetector (8). The avalanche photodetector (8) carries out photoelectric conversion on the optical signal and then sends the electrical signal into the oscilloscope (9) for observation, and the oscilloscope (9) further sends the sampling data into the computer (10) for analysis.
Fig. 2 shows the relationship between the error rate and the peak-to-peak value of the detector response voltage and the beam divergence angle after transmission in a 2m long air channel of a communication system, a ground glass scattering sheet (6) has an advantage when the deviation angle between a transmitter and a receiver is less than 6 degrees, and an engineered diffuser (5) has better performance when the deviation angle is 6 degrees to 12 degrees.
Fig. 3 shows the relationship between the error rate and the peak-to-peak value of the response voltage of the detector and the beam divergence angle after the communication system transmits in a 2m tap water channel, the ground glass scattering sheet (6) has an advantage when the deviation angle between the transmitter and the receiver is less than 5 degrees, and the engineering diffuser (5) has better performance when the deviation angle is 5 degrees to 8 degrees.
While the preferred embodiments and principles of this invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments based on the teachings of the invention and such variations are considered to be within the scope of the invention.
Claims (6)
1. The laser beam expanding wireless optical communication system based on the engineering diffuser and the ground glass scattering sheet comprises signal transmitting equipment (1), an electric amplifier (2), an electric attenuator (3), a laser diode (4), the engineering diffuser (5)/the ground glass scattering sheet (6), a plano-convex lens (7), an avalanche photodetector (8), an oscilloscope (9) and a computer (10);
the device is characterized in that the output end of a signal emitting device (1) is connected with the input end of an electric amplifier (2) through a cable, the output end of the electric amplifier (2) is connected with the input end of an electric attenuator (3) through a cable, the output end of the electric attenuator (3) is connected with the electric input end of a laser diode (4) through a cable, an engineering diffuser (5)/a frosted glass scattering sheet (6) is placed behind the laser diode (4) and used for expanding carrier optical signals emitted by the laser diode (4), a plano-convex lens (7) is placed in front of an avalanche photodetector (8) and used for focusing optical signals transmitted through a channel into a detection aperture of the avalanche photodetector (8), the photoelectric detector (8) is connected with the input end of an avalanche oscilloscope (9) through a cable, and the oscilloscope (9) is connected with a computer (10) through a data line. The signal waveform can be observed from the oscilloscope (9), and the computer (10) is used for analyzing the sampling data of the oscilloscope (9) so as to measure the communication effect.
2. The laser expanded beam wireless optical communication system based on an engineered diffuser and a ground glass diffuser plate according to claim 1, wherein the preferred amplification power of the electrical amplifier (2) is 10 dBm.
3. The laser expanded beam wireless optical communication system based on an engineered diffuser and a ground glass diffuser plate according to claim 1, wherein the laser diode (4) has a center wavelength of 520nm and an output power of preferably 35 mW.
4. The laser expanded beam wireless optical communication system based on the engineered diffuser and the ground glass diffuser plate of claim 1, wherein the engineered diffuser (5) has a diameter of 1 inch and a beam spread angle of 20 ° and is mounted in a SM1 threaded (1.035 inch-40) mount, the ground glass diffuser plate (6) has a diameter of 1 inch and is mounted in a SM1 threaded (1.035 inch-40) mount, and is made of N-BK7 ground glass with a roughness of 1500 mesh.
5. The laser expanded beam wireless optical communication system based on an engineered diffuser and a ground glass diffuser plate of claim 1, wherein the plano-convex lens preferably has a diameter of 10 cm.
6. The laser expanded beam wireless optical communication system based on the engineered diffuser and the ground glass diffuser plate of claim 1, wherein the detection wavelength of the avalanche photodetector (8) is 400nm to 1000nm, the 3dB bandwidth is 5MHz to 1000MHz, and the detection aperture is 0.5 mm.
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| CN202011185715.0A CN113328803A (en) | 2020-10-28 | 2020-10-28 | Laser beam expanding wireless optical communication system based on engineering diffuser and ground glass scattering sheet |
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| CN202011185715.0A CN113328803A (en) | 2020-10-28 | 2020-10-28 | Laser beam expanding wireless optical communication system based on engineering diffuser and ground glass scattering sheet |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202886732U (en) * | 2012-10-24 | 2013-04-17 | 北京凯普林光电科技有限公司 | Compensatory light source system and train operation fault dynamic image detection equipment |
| CN103885189A (en) * | 2014-04-10 | 2014-06-25 | 山东神戎电子股份有限公司 | Laser lighting device for cylindrical environment |
| CN107425909A (en) * | 2017-05-17 | 2017-12-01 | 复旦大学 | A kind of underwater lighting and communication system based on visible light lasers light source |
| CN107664849A (en) * | 2016-07-27 | 2018-02-06 | 长春理工大学 | A kind of laser illuminator system of illumination spot high uniformity |
| US20180062766A1 (en) * | 2016-08-25 | 2018-03-01 | King Abdullah University Of Science And Technology | Systems and methods for underwater illumination, survey, and wireless optical communications |
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2020
- 2020-10-28 CN CN202011185715.0A patent/CN113328803A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202886732U (en) * | 2012-10-24 | 2013-04-17 | 北京凯普林光电科技有限公司 | Compensatory light source system and train operation fault dynamic image detection equipment |
| CN103885189A (en) * | 2014-04-10 | 2014-06-25 | 山东神戎电子股份有限公司 | Laser lighting device for cylindrical environment |
| CN107664849A (en) * | 2016-07-27 | 2018-02-06 | 长春理工大学 | A kind of laser illuminator system of illumination spot high uniformity |
| US20180062766A1 (en) * | 2016-08-25 | 2018-03-01 | King Abdullah University Of Science And Technology | Systems and methods for underwater illumination, survey, and wireless optical communications |
| CN107425909A (en) * | 2017-05-17 | 2017-12-01 | 复旦大学 | A kind of underwater lighting and communication system based on visible light lasers light source |
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Application publication date: 20210831 |