Signal transmitting equipment, lighting communication multiplexing system based on semiconductor laser and communication method

Abstract

The invention discloses signal transmitting equipment, an illumination communication multiplexing system based on semiconductor laser and a communication method. The signal transmitting equipment comprises a signal modulation module, a driving processing module and an illumination module which are connected in sequence, the signal modulation module converts the acquired target information into a modulation signal; the driving processing module drives the illumination module to generate visible communication laser based on the modulation signal; the visible communication laser comprises laser, the lighting module comprises a shell and a semiconductor laser, the shell comprises a side part and a bottom part, the semiconductor laser is arranged on the inner wall of the side part, and the shell reflects part of laser emitted by the semiconductor laser to the signal receiving equipment. By adopting the semiconductor laser, high-brightness visible communication laser containing a modulation signal can be projected, and communication illumination multiplexing is realized; and the semiconductor laser is arranged on the inner wall of the side part of the shell, so that the shell and the laser can be better integrated, integrated arrangement is achieved, and the overall size is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of visible communication optical communication, and in particular to a signal transmitting device, a lighting communication multiplexing system based on semiconductor lasers, and a communication method based on the lighting communication multiplexing system. Background Art

[0002] VLC (Visible Light Communications) is an emerging communication technology that uses visible light with a wavelength of 380-780nm as a medium to transmit information by controlling the high-speed flashing of the light source.

[0003] With the development of the automobile industry and the continuous advancement of wireless communication technology, the Internet of Vehicles is of great significance to improving road safety, optimizing transportation efficiency, and building a new smart city transportation system. Most of the current intelligent transportation networks rely on wireless network connections, which will cause large delays when the network is unstable, and will cause electromagnetic radiation interference in cities with dense communications. Vehicle communication technology cannot fully adapt to application scenarios such as mountainous areas and tunnels, and the real-time transmission of road condition information cannot be effectively guaranteed in real time. Visible communication optical communication for the Internet of Vehicles uses the high-speed brightness and darkness changes of visible communication light to achieve Internet of Vehicles data transmission while lighting. It does not require spectrum authorization and has huge bandwidth, avoiding interference problems in traditional wireless communications, making data transmission more reliable and with lower latency.

[0004] There is an inherent contradiction between the light efficiency and bandwidth of light-emitting diodes (LEDs). The modulation bandwidth that LEDs currently available on the market can only provide is a few tens of MHz. In the existing visible communication optical communication technology based on LED lighting, there are at least the following disadvantages: 1. The optical noise brought by the background light in the outdoor environment has a serious impact, and the system performance needs to be improved; 2. The communication efficiency is not high and the communication distance is short; 3. The communication rate is affected by the inherent power factor of the LED, and the communication rate is not high.

[0005] For example, patent CN200910081993.9 uses semiconductor lighting LED light sources for visible communication optical communication. However, due to the inherent limitations of LED modulation bandwidth, pictures and videos with large amounts of data cannot be transmitted at high rates, and data delays make real-time communication impossible. Another example is the laser lighting lamp and laser lighting lamp disclosed in patent CN201910767846.0. The laser light source passes through a series of focusing lenses, reflectors and other optical components outside and finally excites fluorescence. The lighting lamp is large in size and has a complex optical path. Once the laser light source cannot be aligned with the opening of the reflective bowl, it will cause leakage of the laser light source. Summary of the invention

[0006] In view of this, one of the objects of the present invention is to provide a signal transmitting device with a compact structure and small occupied space.

[0007] The signal transmitting device includes a signal modulation module, a drive processing module and a lighting module connected in sequence; The signal modulation module is used to convert the acquired target information into a modulation signal; The driving processing module is used to drive the lighting module to generate visible communication laser based on the modulation signal; Wherein, the visible communication laser includes a laser, the lighting module includes a shell and a semiconductor laser, the shell includes a side and a bottom, the semiconductor laser is arranged on the inner wall of the side, and the shell is used to reflect part of the laser emitted by the semiconductor laser to a signal receiving device.

[0008] According to some preferred embodiments of the present invention, the lighting module also includes a fluorescence conversion device, which is disposed on the bottom and on an output light path of the semiconductor laser, for receiving laser light emitted by the semiconductor laser and converting the laser light into fluorescence, and the fluorescence is synthesized with the unexcited laser light to form the visible communication laser.

[0009] According to some preferred embodiments of the present invention, the lighting module also includes a diffuser, which is located on the outgoing light path of the fluorescent conversion device and is used to scatter the visible communication laser. The projection of the diffuser on the bottom covers the projection of the fluorescent conversion device on the bottom, that is, the size of the diffuser is greater than or equal to the size of the fluorescent conversion device.

[0010] According to some preferred embodiments of the present invention, the fluorescence conversion device is arranged at the center position of the bottom, and the lighting module also includes an angle adjustment device, which is arranged between the semiconductor laser and the side of the shell, and the angle adjustment device is used to adjust the emission angle of the laser so that the laser is irradiated onto the fluorescence conversion device.

[0011] Preferably, the angle adjustment device is used to make the laser light emitted by the semiconductor laser completely irradiate the fluorescence conversion device.

[0012] According to some preferred implementation aspects of the present invention, the cross-section of the angle adjustment device is a right triangle, and the long side of the right triangle is in contact with the inner wall of the side portion or in contact with the semiconductor laser.

[0013] According to some preferred implementation aspects of the present invention, a bottom surface of the angle adjustment component facing the bottom is flush with a bottom surface of the semiconductor laser facing the bottom.

[0014] According to some preferred implementation aspects of the present invention, the inner wall of the side portion is prism-shaped, the area of ​​the cross-section of the side portion gradually increases from bottom to top, and the multiple semiconductor lasers are symmetrically arranged on the inner wall of the prism-shaped side portion; the multiple semiconductor lasers are located at the same horizontal height.

[0015] According to some preferred embodiments of the present invention, the angle between the inner wall of the side portion and the bottom is 100°-115°, and the taper of the inner wall of the side portion is 2.0-2.1; the inner angle of the top of the angle adjustment device is 19°-24°; and the divergence angle of the semiconductor laser is 0°-33.27°.

[0016] According to some preferred embodiments of the present invention, the vertical height of the shell is 23.5mm-25mm, the vertical height between the top of the angle adjustment device and the bottom of the shell is 10mm-12mm, and the vertical height between the top of the angle adjustment device and the bottom of the angle adjustment device is 1mm-2mm.

[0017] According to some preferred embodiments of the present invention, the lighting module also includes a focusing lens, which is arranged on a side of the side wall of the shell away from the bottom, and is used to converge the visible communication laser and project it toward the signal receiving device; the curvature radius of the light source incident surface of the focusing lens is -140~-135mm, and the curvature radius of the light source exit surface is 30~35mm.

[0018] According to some preferred implementation aspects of the present invention, the signal transmitting device may be a vehicle light module; or, the signal transmitting device is disposed in the vehicle light module.

[0019] The second object of the present invention is to provide a lighting communication multiplexing system based on semiconductor lasers, which can realize high-brightness road lighting and provide high-speed and high-bandwidth visible communication laser communication functions, including a signal transmitting device and a signal receiving device; The signal transmitting device comprises a signal modulation module, a driving processing module and an illumination module connected in sequence; the signal modulation module is used to convert the acquired target information into a modulation signal, and the driving processing module is used to drive the illumination module to generate visible communication laser based on the modulation signal; The signal receiving device includes a detection processing module and a signal demodulation module, wherein the detection processing module is used to receive the visible communication laser and process the visible communication laser to obtain the modulated signal; the signal demodulation module is connected to the detection processing module and is used to demodulate the modulated signal sent by the detection processing module into the target information; Wherein, the visible communication laser includes a laser, the lighting module includes a shell and a semiconductor laser (LD), the shell includes a side and a bottom, the semiconductor laser is arranged on the inner wall of the side, and the shell is used to reflect part of the laser emitted by the semiconductor laser to the detection and processing module.

[0020] According to some preferred implementation aspects of the present invention, the driving processing module includes a digital-to-analog converter, a power amplifier and a driving circuit connected in sequence, the digital-to-analog converter is connected to the signal modulation module, the driving circuit is connected to the lighting module, the signal modulation module is used to modulate the target information into a digital signal, and the digital-to-analog converter is used to convert the digital signal into an analog signal; the power amplifier is used to amplify the analog signal and transmit it to the driving circuit, so that the driving circuit drives the semiconductor laser to generate the laser.

[0021] According to some preferred implementation aspects of the present invention, the detection and processing module includes a photodetector, a transimpedance amplifier, a low-pass filter and an analog-to-digital converter connected in sequence, the photodetector is used to process the received visible communication laser to obtain a first analog electrical signal; the transimpedance amplifier is used to amplify the first analog electrical signal to obtain a second analog electrical signal; the low-pass filter is used to filter the second analog electrical signal to obtain a third analog electrical signal; the analog-to-digital converter is used to convert the third analog electrical signal into a digital signal; the signal demodulation module is used to demodulate the digital signal into the target information.

[0022] Further, the photodetector includes a photodiode-based photodetector and an image sensor-based photosensor.

[0023] Among them, the target information is vehicle-borne information, which can be voice information, picture information or video information, including vehicle communication of road conditions ahead, turn prompts, vehicle-to-vehicle communication, etc. In the semiconductor laser-based lighting communication multiplexing system of the present invention, after the vehicle-borne target information is modulated by the signal and driven by the processing module, the lighting module can project a high-brightness visible communication laser containing a modulated signal, and the signal receiving device can obtain the target information through the detection processing module and signal demodulation processing, thus realizing long-distance lighting, reducing the influence of surrounding stray light on the optical signal, and being able to perform high-speed, high-bandwidth visible communication laser communication.

[0024] A third object of the present invention is to provide a communication method for the semiconductor laser-based illumination communication multiplexing system as described above, comprising the following steps: The signal transmitting device converts the target information into visible communication laser; The signal receiving device receives the visible communication laser and processes it to obtain the target information.

[0025] The present invention also provides an application of the lighting communication multiplexing system as described above in the Internet of Vehicles, such as applying the lighting communication multiplexing system to automobiles, headlights (headlights, taillights), display screens, traffic lights, street lights, road signs and other vehicle-related equipment. Any one or two of the signal transmitting equipment and the signal receiving equipment of the lighting communication multiplexing system can be set on the above-mentioned vehicle-related equipment, and the signal transmitting equipment can emit a high-frequency optical signal greater than 50MHZ.

[0026] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the signal transmitting device of the present invention adopts a semiconductor laser to project a high-brightness visible communication laser containing a modulated signal; and the semiconductor laser is arranged on the inner wall of the side of the shell, which can better integrate the shell and the laser to achieve an integrated setting, reduce the space occupied volume, and reduce the overall volume of the car light module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural principle diagram of a lighting communication multiplexing vehicle lamp system based on semiconductor laser provided by an embodiment of the present invention; Figure 2 is a signal input flow chart of a signal input module provided by an embodiment of the present invention; Figure 3 is a schematic diagram of a top view of a lighting module provided by an embodiment of the present invention; Figure 4 is a schematic cross-sectional structural diagram of a lighting module provided by an embodiment of the present invention; Figure 5 is a schematic diagram of the installation structure of the angle adjustment device and the semiconductor laser in the lighting module provided by an embodiment of the present invention; Figure 6 is a signal output flow chart of a signal output module provided by an embodiment of the present invention; Figure 7 Schematic diagram of an application scenario of a lighting communication multiplexing vehicle lamp system based on semiconductor lasers provided in an embodiment of the present invention; The reference numerals include: 1-signal transmitting device, 3-signal receiving device, 10-signal input module, 102-digital-to-analog converter, 103-power amplifier, 104-driving circuit, 11-illumination module, 110-semiconductor laser, 111-fluorescence conversion device, 112-diffuser, 113-housing, 114-focusing lens, 115-angle adjustment device, 116-bottom, 117-side, 12-signal modulation module, 13-driving processing module, 30-signal output module, 300-photodetector, 301-transimpedance amplifier, 302-low-pass filter, 303-analog-to-digital converter, 31-detection processing module, 32-signal demodulation module, 40-traffic light, 41-display screen. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention. Example 1

[0030] See also Figures 1 to 6 In this embodiment, the signal transmitting device 1 includes a signal modulation module 12, a driving processing module 13 and an illumination module 11 connected in sequence. The signal transmitting device 1 can emit a high-frequency optical signal greater than 50 MHz.

[0031] The signal modulation module 12 is used to convert the acquired target information into a modulation signal; specifically, the modulation signal is a digital signal, that is, the signal modulation module 12 is used to modulate the target information into a digital signal. The target information in this embodiment is vehicle information, which can be voice information, picture information or video information, including vehicle communication of road conditions ahead, turn prompts, vehicle-to-vehicle communication and other information.

[0032] The driving processing module 13 is used to drive the lighting module 11 to generate visible communication laser based on the modulation signal. The driving processing module 13 includes a digital-to-analog converter 102, a power amplifier 103 and a driving circuit 104 connected in sequence, and the driving circuit 104 is connected to the lighting module 11; the digital-to-analog converter 102 is connected to the signal modulation module 12, and the digital-to-analog converter 102 is used to convert the digital signal into an analog signal, and the power amplifier 103 is used to amplify the analog signal and transmit it to the driving circuit 104, so that the driving circuit 104 drives the semiconductor laser 110 to emit laser.

[0033] The signal modulation module 12 is connected to the drive processing module 13 and constitutes the signal input module 10. If there is no target information input, the signal modulation module 12 only plays the role of current transmission, and the drive processing module 13 normally provides DC power to the lighting module 11 to realize the lighting function of the headlight; if there is target information input, the signal modulation module 12 works normally, converts the acquired target information into a modulation signal, and the drive processing module 13 drives the lighting module 11 to generate visible communication laser based on the modulation signal, so that both lighting and laser communication can be realized, that is, the multiplexing function of headlight lighting communication is realized.

[0034] like Figure 3 , Figure 4 , Figure 5 As shown, the lighting module 11 in this embodiment is a vehicle light module for projecting white visible communication laser, which includes a housing 113 (which may be a reflective cup), a fluorescent conversion device 111 , a diffuser 112 , a semiconductor laser 110 and a focusing lens 114 .

[0035] The semiconductor laser 110 is located on the inner wall of the housing 113. The housing 113 is used to reflect part of the laser light emitted by the semiconductor laser 110 to the signal receiving device 3. The focusing lens 114 is located on the side of the side wall of the housing 113 away from the bottom 116, and is used to converge the visible communication laser light and project it to the signal receiving device 3; the focusing lens 114 is preferably a free-form surface lens to achieve high and low beam switching.

[0036] Furthermore, the housing 113 in this embodiment includes a side portion 117 and a bottom portion 116, the semiconductor laser 110 is arranged on the inner wall of the side portion 117, the fluorescence conversion device 111 is arranged at the center position of the bottom portion 116, and the fluorescence conversion device 111 is arranged on the output light path of the semiconductor laser 110, and the wavelength of the semiconductor laser 110 can be 380nm-780nm. The fluorescence conversion device 111 can be a wavelength conversion device such as fluorescent ceramics and fluorescent glass. The semiconductor laser 110 is used to emit laser light to the fluorescence conversion device 111, and the fluorescence conversion device 111 is used to receive the laser light emitted by the semiconductor laser 110 and convert the laser light into fluorescence. The fluorescence and the unexcited laser light are synthesized into a visible communication laser with a wavelength of 380nm-780nm. The visible communication laser contains modulation information after modulation, which can be used for information transmission and lighting at the same time.

[0037] In this embodiment, the semiconductor laser 110 is placed on the inner wall of the side 117, which can better integrate the housing 113, the semiconductor laser 110 and the focusing lens 114, thereby reducing the space volume and the volume of the vehicle light module. The diffuser 112 can ensure the diffusion of the laser and avoid excessive temperature concentration, and can also better synthesize white light (i.e., white visible communication laser).

[0038] The diffuser 112 is disposed on the surface of the fluorescence conversion device 111, between the fluorescence conversion device 111 and the semiconductor laser 110, and on the outgoing optical path of the semiconductor laser 110 and the outgoing optical path of the fluorescence conversion device 111, and is used to scatter the incident laser and the outgoing visible communication laser. The projection of the diffuser 112 on the bottom 116 covers the projection of the fluorescence conversion device 111 on the bottom 116, that is, the size of the diffuser 112 is greater than or equal to the size of the fluorescence conversion device 111, so that the diffuser 112 completely covers the surface of the fluorescence conversion device 111 close to the semiconductor laser 110. The high-energy light source emitted by the semiconductor laser 110 is diffused by the diffuser 112 to avoid uneven heating of the fluorescence conversion device 111, which causes a decrease in service life.

[0039] In this embodiment, the inner wall of the side portion 117 of the housing 113 is preferably prism-shaped, such as a quadrangular prism, a hexagonal prism, an octagonal prism, etc., and the number of semiconductor lasers 110 can be set according to the power of the vehicle lamp and the shape of the prism. The cross-sectional area of ​​the side portion 117 of the prism-shaped housing 113 gradually increases from bottom to top, that is, each face of the prism is inclined. Multiple semiconductor lasers 110 are symmetrically arranged on the inner wall of the prism-shaped side portion 117; multiple semiconductor lasers 110 are located at the same horizontal height and on the same plane.

[0040] In this embodiment, the inner wall of the side portion 117 of the housing 113 is preferably in the shape of a hexagonal prism (internal hexagonal structure), and the distance between the two opposite faces thereof gradually increases from bottom to top. The number of semiconductor lasers 110 is 3, and the three semiconductor lasers 110 are symmetrically distributed on the three faces. The lasers emitted by the three semiconductor lasers 110 pass through the diffuser 112 to excite the fluorescent conversion device 111 at the bottom 116 to generate an excitation light source. The housing 113 reflects all the diffuse light source formed by the diffuser 112 and the excitation light source excited by the fluorescent conversion device 111 to synthesize white visible communication laser light, and converges the synthesized white visible communication laser light through the focusing lens 114 and projects it outward to form an illumination area.

[0041] An angle adjustment device 115 is provided between the semiconductor laser 110 and the side portion 117 of the housing 113, and the semiconductor laser 110 is fixed to the inner wall of the side portion 117 of the housing 113 by means of the angle adjustment device 115. The angle adjustment device 115 adjusts the emission angle of the laser of the semiconductor laser 110, so as to make the laser emitted by the semiconductor laser 110 completely irradiate the fluorescent conversion device 111, and avoid the leakage of the laser.

[0042] In this embodiment, the cross section of the angle adjustment device 115 is a right triangle, and the long side (hypotenuse) of the right triangle is in contact with the inner wall of the side portion 117 or with the semiconductor laser 110. In this embodiment, the bottom surface of the angle adjustment device 115 facing the bottom 116 of the housing 113 is flush with the bottom surface (light emitting surface) of the semiconductor laser 110 facing the bottom 116 of the housing 113, and are located on the same plane.

[0043] like Figure 5 As shown, the inner wall of the side 117 of the housing 113 is tilted, and through the tilt angle of the inner wall of the side 117 of the housing 113 and the top angle θ of the angle adjustment device 115, the laser emitted by the semiconductor laser 110 can be completely incident on the diffuser 112 and the fluorescent conversion device 111 of the bottom 116, and at the same time, the semiconductor laser 110 with a divergence angle of 0°-33.27° can be freely selected, and more types of semiconductor lasers 110 can be selected, with a higher degree of freedom of selection, and the semiconductor laser 110 can be replaced more conveniently. In addition, the housing 113 and the angle adjustment device 115 in this embodiment are both made of metal, which can be reflected by metals such as aluminum plating, and are also beneficial to the heat dissipation of the semiconductor laser 110.

[0044] The vertex angle θ of the angle adjustment device 115 is adjusted according to the inclination angle of the inner wall of the side portion 117 of the housing 113 and the light output angle of the laser 10, so that through the selection of the vertex angle θ of the angle adjustment device 115, the divergence angle of the semiconductor laser 110 can be selected within 33.27°, and the central light beam of the semiconductor laser 110 corresponds to the central position of the fluorescent conversion device 111, while ensuring that the light spot of the semiconductor laser 110 is in the fluorescent conversion device 111, and will not be directly incident on the housing 113 and leak. At the same time, the divergence angle of the semiconductor laser 110 is selected with a high degree of freedom, which prevents the direct leakage of the laser light source from harming the human eye and maximizes the fluorescence conversion of the laser light source and the fluorescent conversion device 111. Multiple low-power semiconductor lasers 110 can be selected in the housing 113 to reduce the impact of temperature on the car lights. The lighting module 11 in this embodiment has a simple structure and a small size, and in order to increase the luminous flux of the car light module, multiple semiconductor lasers 110 can be selected for combination.

[0045] Figure 5In the embodiment, the overall vertical height h1 of the housing 113 is 23.5 mm-25 mm, the vertical height h2 between the top of the angle adjustment device 115 and the bottom of the housing 113 is 10 mm-12 mm, the vertical height h3 between the top of the angle adjustment device 115 and the bottom of the angle adjustment device 115 is 1 mm-2 mm; h4 is the vertical height between the bottom of the angle adjustment device 115 and the bottom of the housing 113, that is, h3+h4=h2. The top angle θ of the angle adjustment device 115 is 19°-24°. If the setting height h2 of the angle adjustment device 115 is relatively large, the light beam of the semiconductor laser 110 will not be able to irradiate the bottom 116 of the fluorescent conversion device 111 and will directly leak out through the shell 113, and the divergence angle of the semiconductor laser 110 will be limited; if the setting height h2 of the angle adjustment device 115 is relatively small, θ will be too large, blocking the light from the bottom 116; within the above-mentioned preferred height and angle range of the angle adjustment device 115, the divergence angle of the semiconductor laser 110 can be selected to be within 33.27°.

[0046] In this embodiment, the angle between the inner wall of the side 117 of the housing 113 and the bottom 116 is 100°-115°, and the taper of the inner wall of the side 117 is 2.0-2.1; the vertex angle θ of the angle adjustment device 115 is 19°-24°; the divergence angle of the selected semiconductor laser 110 is 0°-33.27°. Preferably, the inclination angle between the inner wall of the side 117 of the housing 113 and the bottom 116 is 108.33°, the taper is 2.0983, and the thickness is 1mm-3.62mm. The thin thickness of the side 117 of the housing 113 is conducive to heat dissipation; the vertex angle θ of the angle adjustment device 115 is 23.69°, and its long side is close to the inner wall of the side 117 of the housing 113, and the right-angle side is close to the semiconductor laser 110. The bottom 116 of the housing 113 is fixed with a fluorescent conversion device 111 with a thickness of 0.5mm-1mm and a diameter of 10mm; the upper surface of the fluorescent conversion device 111 is provided with a diffuser 112 with a diameter of 10mm-13.73mm; the condenser lens 114 is used to converge the light and project it onto the road surface. A spherical condenser lens 114 with a diameter of 35mm, a thickness of 13.619mm and a material of H-K9L glass is selected. The curvature radius of the incident surface of the light source is -140~-135mm, and the curvature radius of the light source exit surface is 30~35mm. In this embodiment, the curvature radius of the incident surface of the light source is preferably -138.47mm, and the curvature radius of the light source exit surface is 31.9mm. The spherical glass condenser lens 114 is simple in structure and cheap in price, and is suitable for the complex environment of vehicle lights. The semiconductor laser-based lighting module 11 is more capable of realizing the function of long-distance road lighting, while meeting the visible communication laser communication requirement with an illumination half angle of 20°.

[0047] Furthermore, the exterior of the lighting module 11 may be equipped with a heat dissipation device to achieve high-power laser long-distance lighting. The high-brightness semiconductor laser 110 can reduce the crosstalk of ambient stray light and enhance signal reception.

[0048] The lighting module 11 in this embodiment emits visible communication laser containing modulated signals, which can illuminate the road surface at least 600 meters away, which is twice the distance of LED lighting, and forms a long-distance and large-scale lighting area. The fast light pulses emitted by the semiconductor laser 110 are imperceptible to the human eye and do not affect normal lighting. At the same time, the use of the fluorescent conversion device 111 can prevent the unconverted laser from being directly emitted, reducing the direct harm of high-energy laser to the retina of the human eye. Example 2

[0049] This embodiment uses the lighting communication multiplexing system to form a semiconductor laser-based lighting communication multiplexing vehicle lighting system as an example. In other embodiments, the lighting communication multiplexing system based on semiconductor lasers can also be applied to other locations of the vehicle, display screens 41, traffic lights 40, street lights, road signs and other vehicle-related equipment.

[0050] The semiconductor laser 110 can not only meet the requirements of high-brightness lighting, but also has a modulation bandwidth far greater than that of LEDs. In order to improve the utilization efficiency of the visible communication light spectrum while taking into account lighting, this embodiment provides a lighting communication multiplexing car light system based on semiconductor lasers. In a high-speed motion environment, the laser car light communication modulation speed is fast, and communication can be sent and received synchronously, while achieving long-distance lighting and adapting to a variety of complex special environments. It can solve the practical application problems of visible communication light in vehicle communications.

[0051] like Figures 1 to 7 As shown, the semiconductor laser-based illumination communication multiplexing vehicle lamp system of this embodiment includes a signal transmitting device 1 and a signal receiving device 3, and an illumination area is formed between the signal transmitting device 1 and the signal receiving device 3. The signal transmitting device 1 is the signal transmitting device 1 described in Example 1, wherein the illumination module 11 is a vehicle lamp module, which will not be described in detail herein.

[0052] The signal receiving device 3 includes a detection processing module 31 and a signal demodulation module 32. The detection processing module 31 is connected to the signal demodulation module 32 and constitutes a signal output module 30. The detection processing module 31 is used to receive the visible communication laser and process the visible communication laser to obtain a modulated signal, and the signal demodulation module 32 is used to demodulate the modulated signal sent by the detection processing module 31 into target information. The housing 113 is used to reflect part of the laser emitted by the semiconductor laser 110 to the detection processing module 31.

[0053] like Figure 6As shown, the detection processing module 31 in this embodiment includes a photodetector 300, a transimpedance amplifier 301, a low-pass filter 302 and an analog-to-digital converter 303 connected in sequence. The photodetector 300 is used to process the received visible communication laser to obtain a first analog electrical signal; the transimpedance amplifier 301 is used to amplify the first analog electrical signal to obtain a second analog electrical signal; the low-pass filter 302 is used to filter the second analog electrical signal to obtain a third analog electrical signal; the analog-to-digital converter 303 is used to convert the third analog electrical signal into a digital signal; and the signal demodulation module 32 is used to demodulate the digital signal into target information. Further, the photodetector 300 includes a photodetector based on a photodiode and a photoelectric sensor based on an image sensor.

[0054] Under the same power, the luminous efficiency of the semiconductor laser 110 is one to two times greater than that of the LED; and the laser headlights can irradiate up to 600m, while the LED headlights are 200-300m; so the headlight module in this embodiment can project a high-brightness light source and have a long irradiation distance. Therefore, the photodetector 300 in this embodiment can be selected as a photodiode, which has low cost and simple equipment, and can achieve high-speed reception and detection, greatly reducing the cost of visible communication optical communication data transmission.

[0055] As the communication distance increases, the received optical power becomes smaller and smaller. In addition, the effective receiving area of ​​the photodiode is in the order of square millimeters. Therefore, for a long distance of several hundred meters, even if a transimpedance amplifier 301 (TIA) is used to amplify the signal and a low-pass filter 302 is used to suppress noise, the detection of the optical signal is still difficult. Therefore, a trade-off needs to be made between the transmission distance and the signal reception. This embodiment utilizes the illumination advantage of the semiconductor laser 110, which has high brightness and long illumination distance, to solve the problem of optical communication distance. A low-cost, simple-structured photodiode can be selected to receive more optical signals.

[0056] The signal receiving device 3 receives the visible communication laser emitted by the lighting module 11 and processes it to obtain a digital signal, and converts the digital signal into target information through the signal output module 30 in the signal receiving device 3. At the same time, the optical signal modulation frequency is higher than the traditional LED signal communication frequency.

[0057] like Figure 7As shown, the signal transmitting device 1 can transmit information with the lighting module 11 with optical communication function, such as communication between vehicles with visible communication optical communication function, vehicles traveling in the opposite direction, and vehicles traveling in the same direction. It also includes downloading and uploading information with the display screen 41 and traffic lights 40 with optical communication function, and transmitting the data to the vehicle control system to help the driver understand the real-time traffic conditions and navigation information. The visible communication optical communication network of the headlight can achieve the purpose of unmanned driving by transmitting the information to the vehicle control system. The application of the lighting communication multiplexing system of this embodiment in the Internet of Vehicles, such as applying the above-mentioned lighting communication multiplexing system to vehicle-related equipment such as automobiles, headlights (headlights, taillights), display screens 41, traffic lights 40, street lights, road signs, etc., can be set on the above-mentioned vehicle-related equipment. One of the signal transmitting device 1 and the signal receiving device 3 can be used to perform optical communication with the remaining one of the signal transmitting device 1 and the signal receiving device 3 on another vehicle-related device. Of course, the signal transmitting device 1 and the signal receiving device 3 can also be set on both vehicle-related equipment.

[0058] In the semiconductor laser-based lighting communication multiplexing system of this embodiment, after the vehicle-mounted target information passes through the signal modulation and driving processing module 13, the lighting module 11 can project a high-brightness visible communication laser containing a modulated signal, and the signal receiving device 3 can obtain the target information through the detection processing module 31 and signal demodulation processing, thereby realizing a laser-based lighting communication system and achieving long-distance, high-speed, and high-bandwidth road lighting visible communication optical communication functions. Example 3

[0059] This embodiment provides a communication method of the lighting communication multiplexing system based on Embodiment 2, comprising the following steps: Step 1: The signal transmitting device 1 converts the target information into visible communication laser The signal transmitting device 1 includes a signal modulation module 12, a driving processing module 13 and an illumination module 11. The signal modulation module 12 receives target information generated by user operation, modulates the target information into a digital signal, and transmits the digital signal to the driving processing module 13; the driving processing module 13 drives the illumination module 11 to generate visible communication laser based on the modulation signal.

[0060] Furthermore, the driving processing module 13 includes a digital-to-analog converter 102 , a power amplifier 103 and a driving circuit 104 which are connected in sequence.

[0061] The digital-to-analog converter 102 is used to convert a digital signal into an analog signal.

[0062] The power amplifier 103 is used to amplify the analog signal and transmit it to the driving circuit 104 .

[0063] The driving circuit 104 drives the semiconductor laser 110 to generate laser according to the analog signal. After being diffused by the diffuser 112, part of the laser is irradiated onto the fluorescent conversion device 111. The fluorescent conversion device 111 converts this part of the laser into fluorescence, and forms a visible communication laser together with the unconverted laser. The shell 113 reflects the visible communication laser to the focusing lens 114, which converges the visible communication laser and projects it outward.

[0064] Step 2: The signal receiving device 3 receives the visible communication laser and processes it to obtain target information.

[0065] The signal receiving device 3 includes a detection processing module 31 and a signal demodulation module 32 . The detection processing module 31 includes a photodetector 300 , a transimpedance amplifier 301 , a low-pass filter 302 and an analog-to-digital converter 303 which are connected in sequence.

[0066] The photodetector 300 is used to process the received visible communication laser to obtain a first analog electrical signal.

[0067] The transimpedance amplifier 301 is used to amplify the first analog electrical signal to obtain a second analog electrical signal.

[0068] The low-pass filter 302 is used to filter the second analog electrical signal to obtain a third analog electrical signal.

[0069] The analog-to-digital converter 303 is used to convert the third analog electrical signal into a digital signal.

[0070] The signal demodulation module 32 is connected to the analog-to-digital converter 303 and is used to demodulate the digital signal into target information.

[0071] The semiconductor laser 110 can not only realize high-brightness lighting, but also has a modulation bandwidth far greater than that of LED. The semiconductor laser-based lighting communication multiplexing system of the present invention can synchronously receive and send communications under high-speed motion, thereby improving the utilization efficiency of the visible communication laser spectrum and realizing long-distance lighting at the same time, adapting to a variety of complex special environments.

[0072] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

[0073] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

Claims

1. A signal transmitting device, characterized in that: It includes a signal modulation module, a drive processing module and a lighting module connected in sequence; The signal modulation module is used to convert the acquired target information into a modulation signal; The driving processing module is used to drive the lighting module to generate visible communication laser based on the modulation signal; Wherein, the visible communication laser includes a laser, the lighting module includes a shell and a semiconductor laser, the shell includes a side and a bottom, the semiconductor laser is arranged on the inner wall of the side, and the shell is used to reflect part of the laser emitted by the semiconductor laser to a signal receiving device.

2. The signal transmitting device according to claim 1, characterized in that: The lighting module also includes a fluorescence conversion device, which is arranged on the bottom and on the output light path of the semiconductor laser, and is used to receive laser light emitted by the semiconductor laser and convert the laser light into fluorescence, and the fluorescence and unexcited laser light are combined to form the visible communication laser.

3. The signal transmitting device according to claim 2, characterized in that: The lighting module further includes a diffusion sheet, which is located on the outgoing light path of the fluorescence conversion device and is used to scatter the visible communication laser. The projection of the diffusion sheet on the bottom covers the projection of the fluorescence conversion device on the bottom.

4. The signal transmitting device according to claim 2, characterized in that: The fluorescence conversion device is arranged at the center position of the bottom, and the lighting module also includes an angle adjustment device, which is arranged between the semiconductor laser and the side of the shell, and the angle adjustment device is used to adjust the emission angle of the laser so that the laser is irradiated onto the fluorescence conversion device.

5. The signal transmitting device according to claim 4, characterized in that: The cross section of the angle adjustment device is a right triangle, and the long side of the right triangle is in contact with the inner wall of the side portion or with the semiconductor laser; and / or The bottom surface of the angle adjustment component facing the bottom is flush with the bottom surface of the semiconductor laser facing the bottom; and / or The inner wall of the side portion is prism-shaped, and the area of ​​the cross section of the side portion gradually increases from bottom to top. The multiple semiconductor lasers are symmetrically arranged on the inner wall of the prism-shaped side portion; the multiple semiconductor lasers are located at the same horizontal height.

6. The signal transmitting device according to claim 5, characterized in that: The angle between the inner wall of the side portion and the bottom is 100°-115°, and the taper of the inner wall of the side portion is 2.0-2.1; the inner angle of the top of the angle adjustment device is 19°-24°; the divergence angle of the semiconductor laser is 0°-33.27°; and / or The vertical height of the shell is 23.5mm-25mm, the vertical height between the top of the angle adjustment device and the bottom of the shell is 10mm-12mm, and the vertical height between the top of the angle adjustment device and the bottom of the angle adjustment device is 1mm-2mm.

7. The signal transmitting device according to any one of claims 2 to 6, characterized in that: The lighting module also includes a focusing lens, which is arranged on a side of the side wall of the shell away from the bottom, and is used to converge the visible communication laser and project it to the signal receiving device; the curvature radius of the light source incident surface of the focusing lens is -140~-135mm, and the curvature radius of the light source exit surface is 30~35mm.

8. A semiconductor laser based lighting communication multiplexing system, characterized in that: Including signal transmitting equipment and signal receiving equipment; The signal transmitting device comprises a signal modulation module, a driving processing module and an illumination module connected in sequence; the signal modulation module is used to convert the acquired target information into a modulation signal, and the driving processing module is used to drive the illumination module to generate visible communication laser based on the modulation signal; The signal receiving device includes a detection processing module and a signal demodulation module, wherein the detection processing module is used to receive the visible communication laser and process the visible communication laser to obtain the modulated signal; the signal demodulation module is connected to the detection processing module and is used to demodulate the modulated signal sent by the detection processing module into the target information; Among them, the visible communication laser includes a laser, the lighting module includes a shell and a semiconductor laser, the shell includes a side and a bottom, the semiconductor laser is arranged on the inner wall of the side, and the shell is used to reflect part of the laser emitted by the semiconductor laser to the detection and processing module.

9. The lighting communication multiplexing system according to claim 8, characterized in that: The driving processing module comprises a digital-to-analog converter, a power amplifier and a driving circuit connected in sequence, the digital-to-analog converter is connected to the signal modulation module, the driving circuit is connected to the lighting module, the signal modulation module is used to modulate the target information into a digital signal, and the digital-to-analog converter is used to convert the digital signal into an analog signal; the power amplifier is used to amplify the analog signal and transmit it to the driving circuit, so that the driving circuit drives the semiconductor laser to generate the laser; and / or The detection and processing module includes a photodetector, a transimpedance amplifier, a low-pass filter and an analog-to-digital converter connected in sequence, wherein the photodetector is used to process the received visible communication laser to obtain a first analog electrical signal; the transimpedance amplifier is used to amplify the first analog electrical signal to obtain a second analog electrical signal; the low-pass filter is used to filter the second analog electrical signal to obtain a third analog electrical signal; the analog-to-digital converter is used to convert the third analog electrical signal into a digital signal; and the signal demodulation module is used to demodulate the digital signal into the target information.

10. A communication method of a semiconductor laser-based lighting communication multiplexing system as claimed in claim 8 or 9, characterized in that: The steps include: The signal transmitting device converts the target information into visible communication laser; The signal receiving device receives the visible communication laser and processes it to obtain the target information.

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