Free space communication laser assembly and communication device

Abstract

The utility model provides a free space communication laser assembly and communication equipment. The free space communication laser assembly comprises a shell, a light window is arranged at the top of the shell, and a light receiving unit, a light emitting unit and an electric control reflection assembly are arranged at the bottom of the shell; a to-be-received optical signal enters from the optical window and then enters the optical receiving unit; the electric control reflection assembly is provided with a reflection element, and the electric control reflection assembly enables the reflection element to deflect by different angles under the control of the deflection control signal; a light signal emitted by the light emitting unit is reflected by the reflecting element and then is output from the light window; and the wavelength of an optical signal emitted by the light emitting unit is different from the working wavelength of the light receiving unit. The free space communication laser assembly provided by the utility model is small in size, light in weight, convenient for field installation and deployment, strong in external light interference resistance and high in free space optical communication quality, and can realize automatic alignment with another free space communication laser assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of free space optical communication, in particular to a free space communication laser component and a communication device. Background Art

[0002] Free Space Optical Communication (FSO), also known as wireless laser communication, is a two-way communication technology that realizes voice, data, and image information between point-to-point and point-to-multipoint through lasers in the atmospheric channel. It has the advantages of large communication capacity and high-speed transmission, and does not require laying optical fibers. In traditional free space optical communication systems, independent lasers, optical receivers, and signal processing devices are respectively arranged at two communication ends. The system has a large volume and weight, is not convenient for installation and deployment, and has poor anti-interference ability.

[0003] With the continuous development of semiconductor technology, integrated optical transceiver components have emerged one after another, but most of them are for the field of fiber optic communication. For example, the integrated optical transceivers for fiber optic communication disclosed in Chinese patents with publication numbers CN109975933A and CN102546030A do not have the ability of automatic alignment between communication parties and cannot be applied to free space optical communication scenarios. Summary of the Utility Model

[0004] The utility model aims to solve at least the technical problems existing in the prior art, and provides a free space communication laser component and a communication device.

[0005] To achieve the above object of the utility model, according to the first aspect of the utility model, a free space communication laser component is provided, which includes a housing. A light window is arranged at the top of the housing, and a light receiving unit, a light emitting unit, and an electric control reflection component are arranged at the bottom of the housing. The light signal to be received enters through the light window and then is incident on the light receiving unit. The electric control reflection component has a reflection element, and the electric control reflection component makes the reflection element deflect different angles under the control of a deflection control signal. The light signal emitted by the light emitting unit is reflected by the reflection element and then output from the light window. The wavelength of the light signal emitted by the light emitting unit is different from the working wavelength of the light receiving unit.

[0006] The above technical solution: The free space communication laser component integrates an optical receiving unit, an optical transmitting unit, and an electronically controlled reflection component into one, with a small volume and light weight, facilitating on-site installation and deployment. Moreover, the optical signal is only input or output through the optical window, enhancing the anti-external optical interference ability and the quality of free space optical communication. The wavelength of the optical signal emitted by the optical transmitting unit is set differently from the operating wavelength of the optical receiving unit, that is, the wavelengths of the transmitted optical signal and the received optical signal are different, avoiding mutual interference between the two and further enhancing the quality of free space optical communication. The electronically controlled reflection component enables the reflection element to deflect at different angles under the control of an external deflection control signal, allowing the optical signal emitted by the optical transmitting unit to scan within a large airspace to find the free space communication laser component of another communication end and automatically align with it.

[0007] Preferably, the optical axis of the optical receiving unit is collinear or parallel with the central axis of the optical window.

[0008] The above technical solution: enables the optical receiving unit to receive optical signals within a large range of incident angles.

[0009] Preferably, a first convex portion is provided at the bottom of the housing, and the optical transmitting unit is located on the first convex portion.

[0010] The above technical solution: reduces the intersection of the optical path of the optical signal emitted by the optical transmitting unit and the optical path of the optical signal received by the optical receiving unit, realizes the optimal optical paths of the two, and reduces the mutual influence of the optical paths.

[0011] Preferably, a second convex portion is provided at the bottom of the housing, the electronically controlled reflection component is a MEMS galvanometer, and the MEMS galvanometer is mounted on the second convex portion.

[0012] The above technical solution: uses a MEMS galvanometer as the electronically controlled reflection component, which is convenient for miniaturization and easy to operate; the reflection element of the MEMS galvanometer highly matches the optical signal emitted by the optical transmitting unit, facilitating the effective reflection of the optical signal emitted by the optical transmitting unit and outputting it from the optical window.

[0013] Preferably, the upper surface of the second convex portion is an inclined surface, and the MEMS galvanometer is mounted on the inclined surface.

[0014] The above technical solution: provides a preset auxiliary deflection for the reflection element of the MEMS galvanometer. Combining with the deflection range of the reflection element of the MEMS galvanometer, the emission angle of the optical signal emitted by the optical transmitting unit is increased, enabling it to be emitted within the full optical window.

[0015] Preferably, a narrowband filtering component is provided at the optical input end of the optical receiving unit.

[0016] The above technical solution: filters out the interfering light waves in the input optical signal to be received, enhancing the quality of free space optical communication.

[0017] Preferably, it further includes a condensing element, which is used to converge the light signal to be received entering from the light window to the light input end of the light receiving unit.

[0018] The above technical solution: The condensing element enables more light rays in the light signal to be received to enter the light input end of the light receiving unit, improving the free space optical communication quality, and at the same time facilitating the collection of the energy of the light signal to be received.

[0019] To achieve the above object of the present invention, according to the second aspect of the present invention, the present invention provides a communication device, which includes the free space communication laser assembly described in the first aspect of the present invention; it further includes a laser driving circuit, an optoelectronic signal conditioning circuit and a processing module; the signal sending end of the processing module is connected to the input end of the laser driving circuit, and the output end of the laser driving circuit is connected to the input end of the light emitting unit; the output end of the light receiving unit is connected to the input end of the optoelectronic signal conditioning circuit, and the output end of the optoelectronic signal conditioning circuit is connected to the signal receiving end of the processing module; the deflection control end of the processing module outputs a deflection control signal to the signal input end of the electro-control reflection assembly.

[0020] The above technical solution: In addition to having the beneficial technical effects of the free space communication laser assembly described in the first aspect of the present invention, it also has the beneficial technical effects of small overall volume and easy deployment.

[0021] Preferably, the wavelength of the light signal emitted by the light emitting unit is less than the working wavelength of the light receiving unit.

[0022] The above technical solution: It is convenient to perform energy transmission through the light signal emitted by the light emitting unit.

[0023] To achieve the above object of the present invention, according to the third aspect of the present invention, the present invention provides a communication device, which includes the free space communication laser assembly described in the first aspect of the present invention; it further includes a laser driving circuit, a charging circuit, a battery, a signal conditioning circuit, a processing module, and a current sensor; the signal sending end of the processing module is connected to the input end of the laser driving circuit, and the output end of the laser driving circuit is connected to the input end of the light emitting unit; the output end of the light receiving unit is connected to the input end of the charging circuit, the current sensor is used to detect the current on the connection path between the output end of the light receiving unit and the input end of the charging circuit, the output end of the current sensor is connected to the input end of the signal conditioning circuit, the output end of the signal conditioning circuit is connected to the signal receiving end of the processing module, and the output end of the charging circuit is connected to the battery; the deflection control end of the processing module outputs a deflection control signal to the signal input end of the electro-control reflection assembly; the battery supplies power to the processing module, the laser driving circuit and the signal conditioning circuit.

[0024] The above technical solution: In addition to having the beneficial technical effects of the free-space communication laser component described in the first aspect of the present utility model, it also has the advantages of small overall volume and easy deployment, as well as the beneficial technical effect of converting the received optical signal into electrical energy for powering communication devices. Description of the Drawings

[0025] Figure 1 is a longitudinal sectional structural schematic diagram of the free-space communication laser component in a preferred embodiment of the present utility model;

[0026] Figure 2 is a top view of a transverse section of the free-space communication laser component in a preferred embodiment of the present utility model;

[0027] Figure 3 is another top view of a transverse section of the free-space communication laser component in a preferred embodiment of the present utility model;

[0028] Figure 4 is a system block diagram of the communication device in a preferred embodiment of the present utility model;

[0029] Figure 5 is a system block diagram of the communication device in another preferred embodiment of the present utility model.

[0030] Reference Signs:

[0031] 1 housing; 2 optical window; 3 optical emission unit; 4 optical reception unit; 5 electro-control reflection assembly; 6 first convex portion; 7 second convex portion. Detailed Description of the Preferred Embodiment

[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0034] In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two components. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The present utility model discloses a free space communication laser component. In a preferred embodiment, referring to Figure 1 , the free space communication laser component includes a housing 1. A light window 2 is provided at the top of the housing 1, and a light receiving unit 4, a light emitting unit 3, and an electro-control reflection component 5 are provided at the bottom of the housing 1. The light signal to be received enters through the light window 2 and then is incident on the light receiving unit 4. The electro-control reflection component 5 has a reflection element, and the electro-control reflection component 5 deflects the reflection element at different angles under the control of a deflection control signal. The light signal emitted by the light emitting unit 3 is reflected by the reflection element and then output from the light window 2. The wavelength of the light signal emitted by the light emitting unit 3 is different from the working wavelength of the light receiving unit 4. The light signal to be received is the light signal sent by another optical communication end to the present free space communication laser component.

[0036] In this embodiment, the housing 1 forms a cavity for accommodating the light receiving unit 4, the light emitting unit 3, and the electro-control reflection component 5. The housing 1 can be cylindrical, cuboid, prismatic, or cubic. For the convenience of processing, installation, heat dissipation, and transmission of electrical signals, preferably, the housing 1 includes a bottom plate and an upper shell buckled on the bottom plate, and the light window 2 is opened at the top of the upper shell. The bottom plate is preferably but not limited to a semiconductor substrate, such as a PCB printed circuit board. Further preferably, a plurality of heat dissipation holes can be opened on the bottom plate, and the light receiving unit 4, the light emitting unit 3, and the electro-control reflection component 5 can be welded or mechanically installed on the bottom plate. The upper shell can be made of metal or non-metal materials.

[0037] In this embodiment, the light window 2 at the top of the housing 1 is preferably but not limited to being circular, square, rectangular, polygonal, or any other shape. The light window 2 can be a through hole, which is convenient for reducing the loss of the light signal input or output from the free space communication laser component and also for dissipating the heat generated by the light receiving unit 4, the light emitting unit 3, and the electro-control reflection component 5 during operation. For dust prevention, the light window 2 can be a transparent lens. Further preferably, to reduce the loss of the input or output light signal on the transparent lens, an antireflection coating is respectively plated on the upper and lower surfaces of the transparent lens.

[0038] In this embodiment, the optical receiving unit 4 is preferably but not limited to optoelectronic components such as photodiodes and photosensitive triodes that convert optical signals into electrical signals. The optical transmitting unit 3 can be a laser diode, and existing products can be selected, which will not be elaborated here. When two free-space communication laser components communicate, the operating wavelength of the optical receiving unit 4 on one side should match the wavelength (such as the central wavelength) of the optical signal output by the optical transmitting unit 3 on the other side. Specifically, they can be the same, or the wavelength of the optical signal is within the operating wavelength range; the wavelength of the optical signal output by the optical transmitting unit 3 on one side should match the operating wavelength of the optical receiving unit 4 on the other side. For example, in one example, the central wavelength of the optical signal output by the optical transmitting unit 3 of a free-space communication laser component is 808 nm, then the operating wavelength range of the optical receiving unit 4 of another free-space communication laser component should include 808 nm, and the central wavelength of the operating wavelength range of the optical receiving unit 4 of this free-space communication laser component is 1310 nm; then the central wavelength of the optical signal output by the optical transmitting unit 3 of another free-space communication laser component is 1310 nm. Therefore, in the same free-space communication laser component, the wavelength of the optical signal emitted by the optical transmitting unit 3 is different from the operating wavelength of the optical receiving unit 4, which means that the wavelength range of the optical signal emitted by the optical transmitting unit 3 does not intersect or overlap with the operating wavelength range of the optical receiving unit 4, so as to avoid interference during the process of converting the input optical signal into an electrical signal by the optical receiving unit 4 for the output optical signal.

[0039] In this embodiment, the electronically controlled reflection assembly 5 may include a micro-reflection stage. A reflecting mirror is provided on the tabletop of the micro-reflection stage, and the reflecting mirror is a reflecting element. Three or four piezoelectric telescopic columns are connected below the micro-reflection stage. One end of the piezoelectric telescopic column is fixed to the bottom of the housing 1, and the other end of the piezoelectric telescopic column is connected to the bottom of the micro-reflection stage. The piezoelectric telescopic column has a piezoelectric ceramic element inside. The piezoelectric ceramic element elongates or shortens under the drive of voltage signals with the same or opposite polarization directions of the piezoelectric material. Three or four piezoelectric telescopic columns perform different telescopic changes synchronously, so that the upper micro-reflection stage presents different tilting angles, and then the tilting angle of the reflecting mirror on the tabletop changes, and the exit angle of the reflected output optical signal changes, so as to find another communication end to achieve self-alignment. At this time, the externally input deflection control signal is the drive voltage signal of the piezoelectric ceramic.

[0040] In this embodiment, for the convenience of signal transmission and the installation of the free-space communication laser component, preferably, a signal connection unit is provided at the bottom of the housing 1 (such as on the bottom plate). The signal connection unit is preferably but not limited to multiple signal lines passing through the bottom (bottom plate) of the housing 1, or multiple connection PIN feet, or multiple pin feet (such as Figure 1As shown). Multiple signal lines, multiple connection PINs, or multiple pin terminals are used to output the photocurrent signal converted by the optical receiving unit 4, input a drive current or voltage signal to the optical transmitting unit 3, and input a deflection control signal to the signal input terminal of the electro-control reflection component 5.

[0041] In this embodiment, Figure 2 and Figure 3 show two top views of the transverse section of the free-space communication laser component. Figure 2 In [a certain situation], the connecting line of the center points of the upper surfaces of the optical receiving unit 4, the optical transmitting unit 3, and the electro-control reflection component 5 at the bottom of the housing 1 is close to or is a straight line when viewed from above. At this time, to prevent the optical receiving unit 4 from blocking the optical signal output by the optical transmitting unit 3 and making it unable to reach the reflection element for reflection smoothly, it can be avoided in the height direction, so that the height of the electro-control reflection component 5 and the optical transmitting unit 3 from the bottom of the housing 1 is greater than or less than the height of the optical receiving unit 4 from the bottom of the housing 1. Figure 3 In [another situation], the closed connecting line of the center points of the upper surfaces of the optical receiving unit 4, the optical transmitting unit 3, and the electro-control reflection component 5 at the bottom of the housing 1 forms a triangle when viewed from above. At this time, there is no need to avoid in the height direction.

[0042] In this embodiment, the optical axis of the optical receiving unit 4 can be parallel or non-parallel to the central axis of the optical window 2. When it is non-parallel, the optical receiving unit 4 may not be vertically installed relative to the bottom of the housing 1 and may have a certain inclination angle. The optical axis of the optical transmitting unit 3 is not parallel or collinear with the central axis of the optical window 2, and its optical axis is inclined or horizontal relative to the bottom of the housing 1 (as Figures 1-3 shown), not vertical.

[0043] In a preferred embodiment, the optical axis of the optical receiving unit 4 is collinear or parallel with the central axis of the optical window 2. So that the optical receiving unit 4 can receive optical signals within a larger incident angle range. Therefore, the optical receiving unit 4 is installed as perpendicular to the bottom of the housing 1 as possible. Figure 2 shows the situation where the optical axis of the optical receiving unit 4 is collinear with the central axis of the optical window 2, that is, the optical receiving unit 4 is located at the exact center of the bottom of the housing 1. Figure 3 shows the situation where the optical axis of the optical receiving unit 4 is parallel to the central axis of the optical window 2.

[0044] In a preferred embodiment, a first convex portion 6 is provided at the bottom of the housing 1, and the optical transmitting unit 3 is located on the first convex portion 6. The first convex portion 6 is preferably but not limited to a convex platform, convex surface, convex shell, or bracket of any shape (rectangular, prismatic, conical, cylindrical, etc.), and can be made of plastic or semiconductor material. The optical transmitting unit 3 is installed on the upper surface of the first convex portion 6.

[0045] In this embodiment, the optical receiving unit 4 and the electrically controlled reflection component 5 can be directly mounted on the bottom of the housing 1. By adjusting the tilt angle of the optical transmitting unit 3 on the first convex portion 6, the reflecting element of the electrically controlled reflection component 5 can effectively reflect the output optical signal, thereby reducing the intersection of the optical path of the optical signal emitted by the optical transmitting unit 3 and the optical path of the optical signal received by the optical receiving unit 4, achieving the optimal optical path for both and reducing the mutual influence of the optical paths.

[0046] In a preferred embodiment, as Figure 1 shown, a second convex portion 7 is provided at the bottom of the housing 1, and the electrically controlled reflection component 5 is a MEMS galvanometer, and the MEMS galvanometer is mounted on the second convex portion 7. The second convex portion 7 is preferably but not limited to a boss or convex surface or convex shell or bracket of any shape (rectangular, prismatic, conical, cylindrical, etc.), and can be made of plastic or semiconductor material. The electrically controlled reflection component 5 is mounted on the upper surface of the first convex portion 6. This further reduces the intersection of the optical path of the optical signal emitted by the optical transmitting unit 3 and the optical path of the optical signal received by the optical receiving unit 4, and optimizes the optical path.

[0047] In this embodiment, the deflectable reflector in the MEMS galvanometer serves as the reflecting element. The MEMS galvanometer can select existing electromagnetic drive type or piezoelectric drive type products. For example, the MEMS galvanometer with the model EM-05X of Suzhou Sensingcom Information Technology Co., Ltd. can achieve a large range of deflection, or the MEMS chips with the models P1100, P1130, P1150, and P1220 of Xi'an Zhiwei Sensing Technology Co., Ltd. are not elaborated here.

[0048] In this embodiment, further preferably, the upper surface of the second convex portion 7 is an inclined surface, and the MEMS galvanometer is mounted on the inclined surface, as Figure 1 shown.

[0049] In a preferred embodiment, a narrowband filtering component is provided at the optical input end of the optical receiving unit 4. The narrowband filtering component only allows light rays within the working wavelength range of the optical receiving unit 4 to pass through.

[0050] In this embodiment, the optical input end of the optical receiving unit 4 can specifically be the glass window or the upper space area above the photosensitive element of the optical receiving unit 4. The narrowband filtering component can be a narrowband filtering film attached or plated on the glass window, or a narrowband filtering sheet added to the optical input end of the optical receiving unit 4 by screwing or buckling. The specific connection structure is a conventional technology in this field and is not elaborated here.

[0051] In a preferred embodiment, a light condensing element is further included, and the light condensing element is used to converge the optical signal to be received entering from the light window 2 to the optical input end of the optical receiving unit 4.

[0052] In this embodiment, the light condensing element is preferably but not limited to a convex lens, and the convex lens can be installed at the light input end or in front of the light receiving unit 4 by screwing or buckling. The specific connection structure is a conventional technique in the art and will not be elaborated here.

[0053] In this embodiment, preferably, the light condensing element is coaxial with the input end of the light receiving unit 4, and the area of the light condensing element is larger than the area of the light input end of the light receiving unit 4.

[0054] In this embodiment, more preferably, a narrowband filter film is plated on the surface of the light condensing element, and this narrowband filter film only allows light rays within the working wavelength range of the light receiving unit 4 to pass through.

[0055] The present utility model also discloses a communication device. Referring to Figure 4 as shown, this communication device includes the free space communication laser assembly provided in the above preferred embodiment; it also includes a laser driving circuit, a photoelectric signal conditioning circuit, and a processing module; the signal sending end of the processing module is connected to the input end of the laser driving circuit, and the output end of the laser driving circuit is connected to the input end of the light emitting unit 3; the output end of the light receiving unit 4 is connected to the input end of the photoelectric signal conditioning circuit, and the output end of the photoelectric signal conditioning circuit is connected to the signal receiving end of the processing module; the deflection control end of the processing module outputs a deflection control signal to the signal input end of the electro-control reflection assembly 5.

[0056] In this embodiment, preferably, the processing module includes a baseband chip circuit and a processor. The processor can be a single-chip microcomputer or other embedded chips. The processor is connected to the baseband chip for communication. The baseband chip is also respectively connected to the input end of the laser driving circuit and the output end of the photoelectric signal conditioning circuit. The processor transmits communication information to the baseband chip, and the baseband chip circuit generates a modulation signal corresponding to the communication information and inputs the modulation signal into the laser driving circuit to modulate the driving current output by the laser driving circuit, thereby modulating the optical signal output by the light emitting unit 3 to carry the communication information. The baseband chip circuit is also used to receive the output signal of the photoelectric signal conditioning circuit, demodulate the communication information output by the other optical communication end from this output signal, and forward this communication information to the processor for processing. The processor outputs a rotation control signal to the signal input end of the electro-control reflection assembly 5.

[0057] In this embodiment, the laser driving circuit can be an existing laser diode driving circuit, such as the circuit structures disclosed in Chinese patents with publication numbers CN102570296A, CN101071934A, etc., which will not be elaborated here. The photoelectric signal conditioning circuit mainly includes a current-voltage conversion circuit (transimpedance discharge circuit) and a voltage operational amplifier amplification circuit connected in sequence, etc., and can refer to the circuit structures disclosed in Chinese patents with publication numbers CN103674797A, CN102508407A, etc. in the prior art, which will not be elaborated here.

[0058] In this embodiment, preferably, a circuit board is provided and used to carry a laser driving circuit, an optoelectronic signal conditioning circuit, and a processing module, so as to facilitate integration and implementation.

[0059] In a preferred embodiment, by setting a relatively large driving current for the laser driving circuit, the intensity of the optical signal emitted by the optical transmitting unit 3 is relatively large. The optical receiving unit 4 of the communication device on the other side will convert a relatively large current, and this relatively large current can be used to supply power to the communication device on the other side, so as to achieve energy transmission. It should be noted that this embodiment does not limit the magnitude relationship between the wavelength of the optical signal output by the optical transmitting unit 3 and the wavelength of the optical signal received by the optical receiving unit 4 of the free space communication laser component of the communication device acting as the energy supply side. The wavelength of the optical signal output by the optical transmitting unit 3 can be greater than or less than the wavelength of the optical signal received by the optical receiving unit 4. The communication device provided in this embodiment can be an energy supply side or an energy receiving side, and when acting as an energy receiving side, it also has a rechargeable battery.

[0060] In a preferred embodiment, to achieve large energy transmission and in combination with the current development of lasers. To ensure that the intensity of the optical signal emitted by the optical transmitting unit 3 is relatively large, preferably, the wavelength of the optical signal emitted by the optical transmitting unit 3 is less than the working wavelength of the optical receiving unit 4. Specifically, the central wavelength of the optical signal emitted by the optical transmitting unit 3 is less than the central wavelength of the working wavelength range of the optical receiving unit 4. A shorter wavelength is more likely to obtain a high-power laser signal. For example, when the wavelength is 808 nm, the power of the laser signal can reach several watts, ten watts or even higher. Currently, when the wavelength is mid-infrared such as 1310 nm, the power of the laser signal is only at the milliwatt level.

[0061] The present utility model also discloses a communication device, which can be an energy receiving side in the energy transmission mode. Referring to Figure 5 As shown, the communication device includes the free space communication laser component provided in the above preferred embodiment, and also includes a laser driving circuit, a charging circuit, a battery, a signal conditioning circuit, a processing module, and a current sensor; the signal sending end of the processing module is connected to the input end of the laser driving circuit, and the output end of the laser driving circuit is connected to the input end of the optical transmitting unit 3; the output end of the optical receiving unit 4 is connected to the input end of the charging circuit, the current sensor is used to detect the current on the connection path between the output end of the optical receiving unit 4 and the input end of the charging circuit, the output end of the current sensor is connected to the input end of the signal conditioning circuit, the output end of the signal conditioning circuit is connected to the signal receiving end of the processing module, and the output end of the charging circuit is connected to the battery; the deflection control end of the processing module outputs a deflection control signal to the signal input end of the electro-control reflection component 5; the battery supplies power to the processing module, the laser driving circuit, and the signal conditioning circuit.

[0062] In this embodiment, the laser driving circuit and the processing module may refer to the circuit structures in the above preferred embodiments, which will not be elaborated herein. The charging circuit is preferably a charging management chip and its peripheral circuits, and the charging management chip is connected and communicates with the processor of the processing module. The charging management chip is preferably but not limited to existing products with part numbers such as PW4203 and XT2502, which will not be elaborated herein. To simplify the circuit, the charging circuit may also be only a PMOS transistor switching circuit. The gate of the PMOS transistor switching circuit is connected to the processor of the processing module, and the source and drain of the PMOS transistor switching circuit are respectively connected to the output end of the optical receiving unit and the battery. The battery is preferably a lithium battery. The current sensor is preferably but not limited to a current transformer, or a sampling resistor connected in series in the connection path between the output end of the optical receiving unit 4 and the input end of the charging circuit. The signal conditioning circuit is preferably a conventional amplifier circuit based on a power amplifier.

[0063] In this embodiment, after the optical receiving unit 4 of this communication device receives the optical signal sent by the other optical communication end, the photocurrent output by the optical receiving unit 4 charges the battery through the charging circuit. At the same time, the current sensor detects the photocurrent, outputs the detection result to the signal conditioning circuit for processing, and then the baseband chip demodulates to obtain the communication information, and transmits the demodulated communication information to the processor.

[0064] In this embodiment, it should be noted that the related algorithms involved in the communication device, such as modulation, demodulation, charging methods, etc. are all existing technologies and are not within the protection scope of the present invention.

[0065] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", "one implementation manner", "one preferred implementation manner" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0066] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A free space communication laser assembly, characterized in that: It comprises a shell, a light window is arranged on the top of the shell, and a light receiving unit, a light emitting unit and an electrically controlled reflection component are arranged on the bottom of the shell; The optical signal to be received enters from the optical window and is incident on the optical receiving unit; The electrically controlled reflective assembly comprises a reflective element, and the electrically controlled reflective assembly deflects the reflective element at different angles under the control of a deflection control signal; The optical signal emitted by the optical emitting unit is reflected by the reflecting element and then output from the optical window; The wavelength of the optical signal emitted by the optical emitting unit is different from the working wavelength of the optical receiving unit.

2. The free space communication laser assembly of claim 1, wherein: The optical axis of the light receiving unit is collinear or parallel to the central axis of the light window.

3. The free space communication laser assembly according to claim 1 or 2, characterized in that: The bottom of the housing is provided with a first convex portion, and the light emitting unit is located on the first convex portion.

4. The free space communication laser assembly of claim 3, wherein: A second convex portion is provided at the bottom of the shell, and the electrically controlled reflection component is a MEMS oscillating mirror, which is mounted on the second convex portion.

5. The free space communication laser assembly of claim 4, wherein: The upper surface of the second convex portion is an inclined surface, and the MEMS galvanometer is installed on the inclined surface.

6. The free space communication laser assembly according to claim 1, 2, 4 or 5, characterized in that: A narrowband filter component is provided at the optical input end of the optical receiving unit.

7. The free space communication laser assembly according to claim 1, 2, 4 or 5, characterized in that: It also includes a focusing element, which is used to focus the light signal to be received entering from the light window to the light input end of the light receiving unit.

8. A communication device, characterized in that: A free space communication laser assembly comprising any one of claims 1 to 7; It also includes a laser driving circuit, an optoelectronic signal conditioning circuit and a processing module; The signal sending end of the processing module is connected to the input end of the laser driving circuit, and the output end of the laser driving circuit is connected to the input end of the light emitting unit; The output end of the light receiving unit is connected to the input end of the photoelectric signal conditioning circuit, and the output end of the photoelectric signal conditioning circuit is connected to the signal receiving end of the processing module; The deflection control end of the processing module outputs a deflection control signal to the signal input end of the electrically controlled reflection component.

9. The communication device according to claim 8, characterized in that The wavelength of the optical signal emitted by the optical emitting unit is smaller than the working wavelength of the optical receiving unit.

10. A communication device, characterized in that: A free space communication laser assembly comprising any one of claims 1 to 7; It also includes a laser driving circuit, a charging circuit, a battery, a signal conditioning circuit, a processing module, and a current sensor; The signal sending end of the processing module is connected to the input end of the laser driving circuit, and the output end of the laser driving circuit is connected to the input end of the light emitting unit; The output end of the light receiving unit is connected to the input end of the charging circuit, the current sensor is used to detect the current in the connection path between the output end of the light receiving unit and the input end of the charging circuit, the output end of the current sensor is connected to the input end of the signal conditioning circuit, the output end of the signal conditioning circuit is connected to the signal receiving end of the processing module, and the output end of the charging circuit is connected to the battery; The deflection control end of the processing module outputs a deflection control signal to the signal input end of the electrically controlled reflection component; the battery supplies power to the processing module, the laser driving circuit and the signal conditioning circuit.

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