Portable electric power laser communication device

Abstract

The invention relates to the technical field of laser communication, in particular to a portable electric power laser communication device which comprises a transmitting terminal and a receiving terminal, an optical path can be accurately aligned by adjusting azimuth pitching adjusting devices of the transmitting terminal and the receiving terminal, transmission of optical signals is achieved, and the transmission efficiency of the optical signals is ensured. A small divergence angle is realized through the aspherical lens so as to avoid excessive energy loss, the Fresnel lens can ensure that the photoelectric detector in the receiving terminal receives more energy, and meanwhile, the structure is miniaturized. And the narrow-band optical filter can ensure that the device is used in an environment with strong background light. In addition, the portable electric power laser communication device adopts an optical design with a small divergence angle, a large receiving aperture and a short focal length, and a simple and miniaturized structural design, so that the portable electric power laser communication device is suitable for use requirements in various complex environments.

Description

Technical Field

[0001] The invention relates to the technical field of laser communication, and in particular to a portable electric laser communication device. Background Art

[0002] Space laser communication, also known as "free space laser communication", refers to a technology that uses laser beams as carriers to directly transmit voice, data, and image information in space. Space laser communication combines the advantages of radio communication and fiber optic communication. It modulates electrical signals loaded with information onto light, establishes a communication link between the transmitter and receiver, and transmits information in a free space channel using light as a carrier. Its main advantages include high communication rate; large communication capacity; strong confidentiality; light structure; and fast transmission speed. Existing portable laser communication devices have complex optical paths, making it difficult to ensure stability when used in complex environments.

[0003] At present, traditional electric power laser communication equipment mainly focuses on high-speed data transmission between fixed sites. Its system design is often large, and the divergence angle of the laser beam is narrow, which limits its application scenarios and is mainly limited to communication between two fixed points. This type of equipment is not only large in size, but also has high power consumption, and the efficiency of energy utilization needs to be improved. During the installation process, traditional laser communication equipment needs to rely on high-precision alignment technology to ensure that the laser beam can accurately transmit information, which not only increases the complexity and time cost of the installation, but also makes it difficult to easily move or readjust the position of the equipment once it is installed. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a portable electric laser communication device.

[0005] A portable electric laser communication device comprises a transmitting terminal and a receiving terminal, wherein the transmitting terminal comprises a transmitting terminal accommodating device, a light emitting device and a signal modulating device; the light emitting device and the signal modulating device are arranged inside the transmitting terminal accommodating device, and a light emitting hole is opened on the transmitting terminal accommodating device;

[0006] The light emitting device comprises an aspheric lens, an emitting lens barrel, a laser diode, an emitting window and an optical fiber; the emitting lens barrel is fixed inside the emitting terminal accommodation device, two ends of the emitting window are respectively connected to the end of the emitting lens barrel and the position corresponding to the light emitting hole on the emitting terminal accommodation device, the aspheric lens is connected inside the emitting lens barrel, the laser diode is connected to the emitting terminal accommodation device and the signal modulation device, and the optical fiber is connected to the emitting lens barrel; the signal modulation device is used to load the input electrical signal into the signal light to realize the conversion from the electrical signal to the optical signal;

[0007] The receiving terminal comprises a receiving terminal accommodating device, a light receiving device and a power supply device; the light receiving device and the power supply device are arranged inside the receiving terminal accommodating device, and a light receiving hole is opened on the receiving terminal accommodating device;

[0008] The optical receiving device includes a Fresnel lens, a receiving lens barrel, a photodetector, a narrowband filter and an optical receiving modulation circuit board; the receiving lens barrel and the optical receiving modulation circuit board are fixed inside the receiving terminal accommodation device, the Fresnel lens and the narrowband filter are connected to the receiving lens barrel, and the photodetector is arranged on the optical receiving modulation circuit board; the power supply device is connected to the optical receiving modulation circuit board.

[0009] Furthermore, the bottoms of the transmitting terminal and the receiving terminal are both connected with azimuth and elevation adjustment devices;

[0010] The azimuth and pitch adjustment device comprises a base, an azimuth adjustment part and a pitch adjustment part. The top of the base is connected to the azimuth adjustment part, the top of the azimuth adjustment part is connected to the pitch adjustment part, and the bottom of the base is a clamp-shaped structure.

[0011] Further, the transmitting terminal accommodating device comprises a transmitting terminal accommodating device base, a transmitting terminal accommodating device side cover and a transmitting terminal accommodating device bottom cover;

[0012] The transmitting terminal accommodating device base is a semi-enclosed structure surrounded by three side panels and a top panel, the transmitting terminal accommodating device side cover is connected to the unenclosed side of the transmitting terminal accommodating device base, the transmitting terminal accommodating device bottom cover is connected to the transmitting terminal accommodating device base and the bottom of the transmitting terminal accommodating device side cover, and a light emitting hole is opened on the top panel of the transmitting terminal accommodating device side cover.

[0013] Further, the receiving terminal accommodating device comprises a receiving terminal accommodating device base, a receiving terminal accommodating device side cover and a receiving terminal accommodating device bottom cover;

[0014] The receiving terminal accommodating device base is a semi-enclosed structure surrounded by three side panels and a top panel, the receiving terminal accommodating device side cover is connected to the unenclosed side of the receiving terminal accommodating device base, the receiving terminal accommodating device bottom cover is connected to the receiving terminal accommodating device base and the bottom of the receiving terminal accommodating device side cover, and a light receiving hole is opened on the top panel of the receiving terminal accommodating device base.

[0015] Further, the signal modulation device includes a signal modulation circuit board and a signal output head;

[0016] The signal modulation circuit board is connected to the transmitting terminal accommodating device, and the signal output head is arranged on the signal modulation circuit board.

[0017] Further, the power supply device includes a power supply circuit board and a power supply interface;

[0018] The power supply circuit board is connected to the receiving terminal accommodating device, and the power supply interface is arranged on the circuit board.

[0019] Furthermore, a circular ring-shaped boss is provided at the position of the light emitting hole in the emitting terminal accommodating device, and the circular ring-shaped boss is provided with an internal thread for connecting with the emitting window.

[0020] Furthermore, the effective aperture of the Fresnel lens is 88 mm, the focal length is 14.58 mm, the refractive index is 1.49, and the Abbe number is 57.44; the effective aperture of the narrowband filter (604) is 24 mm, the refractive index is 1.52, the Abbe number is 64.2, the central transmission wavelength is 450 nm, and the bandwidth is 40-50 nm.

[0021] Furthermore, the aspheric lens has an effective aperture of 8 mm, a focal length of 14.58 mm, a refractive index of 1.58, an Abbe number of 59.39, and a beam divergence angle of 7-8 mrad.

[0022] Furthermore, the typical wavelength of the laser diode is 450 nm, and the maximum modulation rate is 10 Mbps.

[0023] The technical solution of the present invention utilizes the collimation function of aspheric lenses, the large-aperture and short-focal-length characteristics of Fresnel lenses, and the filtering ability of narrow-band filters to achieve efficient optical communication. Through the synergistic effect of photoelectric conversion and optical lenses, optical signals can be transmitted in free space and received and processed by photodetectors. The present invention can achieve higher-precision optical signal alignment and effectively reduce the beam divergence angle of the emitted light and the focusing degree and light-gathering efficiency of the received light, thereby improving the working efficiency and performance of the photodetector. At the same time, the portable electric laser communication device adopts a miniaturized and lightweight design to meet the needs of use in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 An exploded diagram of a transmitting terminal in a portable electric laser communication device provided by the present invention;

[0026] Figure 2 An exploded diagram of a receiving terminal in a portable electric laser communication device provided by the present invention;

[0027] Figure 3A signal modulation principle diagram of a portable electric laser communication device provided by the present invention;

[0028] Figure 4 A schematic diagram of a modulation circuit board of a portable electric laser communication device provided by the present invention;

[0029] Figure 5 A working principle diagram of a portable electric laser communication device provided by the present invention;

[0030] Figure 6 A schematic diagram of a transmission optical path of a portable electric laser communication device provided by the present invention;

[0031] Figure 7 A schematic diagram of a receiving optical path of a portable electric laser communication device provided by the present invention;

[0032] Figure 8 A pole-mounted receiving and transmitting scene diagram of a portable electric laser communication device provided by the present invention.

[0033] Fig. 9 The present invention provides a portable electric laser communication device for transmitting and receiving scenes on the ground on a pole.

[0034] Description of reference numerals:

[0035] 101- azimuth and elevation adjustment device connection hole; 102- light emission hole;

[0036] 103-transmitting terminal accommodating device base; 104-transmitting terminal accommodating device side cover;

[0037] 105-transmitting terminal accommodating device bottom cover; 201-adapting connection hole;

[0038] 202-azimuth pitch adjustment device base; 203-azimuth adjustment part;

[0039] 204-pitch adjustment part; 301-aspherical lens; 301-1-first pressure ring;

[0040] 302-emitting lens barrel; 303-laser diode; 304-emitting window;

[0041] 304-1-second pressing ring; 305-optical fiber; 401-signal modulation circuit board;

[0042] 402-signal output head; 501-light receiving hole; 502-bottom opening;

[0043] 503-receiving terminal accommodating device base; 504-receiving terminal accommodating device side cover;

[0044] 505- bottom cover of receiving terminal accommodation device; 601- Fresnel lens;

[0045] 601-1-the third pressing ring; 602-receiving lens barrel; 603-photoelectric detector;

[0046] 604-narrowband filter; 604-1-fourth pressure ring; 605-optical receiving modulation circuit board;

[0047] 701-power supply circuit board; 702-power interface. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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 are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] See also Figure 1 to Figure 2 , a portable electric laser communication device, specifically an electric laser communication device applied in the field of laser communication with a communication distance of 20m and a communication rate of 10Mbps;

[0053] It mainly includes a transmitting terminal and a receiving terminal. The transmitting terminal includes a transmitting terminal accommodating device, a light emitting device and a signal modulating device. The light emitting device and the signal modulating device are arranged inside the transmitting terminal accommodating device. A light emitting hole 102 is opened on the transmitting terminal accommodating device.

[0054] The light emitting device is an important part of the transmitting terminal, including an aspheric lens 301, a transmitting lens barrel 302, a laser diode 303, a transmitting window 304 and an optical fiber 305; the transmitting lens barrel 302 is fixed inside the transmitting terminal accommodation device, and the two ends of the transmitting window 304 are respectively connected to the end of the transmitting lens barrel 302 and the position corresponding to the light emitting hole 102 on the transmitting terminal accommodation device. Specifically, the transmitting window 304 is connected to the transmitting lens barrel 302 through the second pressing ring 304-1, the aspheric lens 301 is connected to the inside of the transmitting lens barrel 302 through the first pressing ring 301-1, the laser diode 303 is connected to the transmitting terminal accommodation device and the signal modulation device, and the optical fiber 305 is connected to the transmitting lens barrel 302 through the M2 screw; the main function of the light emitting device is to align the modulated signal light through the aspheric lens to the receiving terminal, thereby realizing data transmission.

[0055] The signal modulation device is used to load the input electrical signal into the signal light to realize the conversion from electrical signal to optical signal;

[0056] The receiving terminal includes a receiving terminal accommodating device, a light receiving device and a power supply device; the light receiving device and the power supply device are arranged inside the receiving terminal accommodating device, and a light receiving hole 501 is opened on the receiving terminal accommodating device;

[0057] The optical receiving device is an important part of the receiving terminal. Its main function is to receive the signal light emitted by the transmitting terminal and converge it on the photodetector 603. It includes a Fresnel lens 601, a receiving lens barrel 602, a photodetector 603, a narrowband filter 604 and an optical receiving modulation circuit board 605; the receiving lens barrel 602 and the optical receiving modulation circuit board 605 are fixed inside the receiving terminal accommodation device, and the Fresnel lens 601 and the narrowband filter 604 are both connected to the receiving lens barrel 602. Specifically, the Fresnel lens 601 is connected to the receiving lens barrel 602 through the third pressure ring 601-1, the narrowband filter 604 is connected to the receiving lens barrel through the fourth pressure ring 604-1, and the photodetector 603 is arranged on the optical receiving modulation circuit board 605; the power supply device is connected to the optical receiving modulation circuit board 605 by a tail plug to achieve stable power supply. The photoelectric detector 603 uses a PIN detector. The overall signal processing system is composed of a PIN detector, a low noise amplifier, a balanced amplifier, data recovery, clock extraction, a bias voltage, a signal light intensity value output, etc. After being connected to the power supply device, it is powered by a single power supply 24VDC.

[0058] The bottoms of the transmitting terminal and the receiving terminal are connected to the azimuth pitch adjustment device through M6 screws, and the azimuth pitch adjustment device is used for azimuth pitch adjustment of the transmitting terminal and the receiving terminal to facilitate alignment of the optical path;

[0059] The azimuth and pitch adjustment device includes a base 202, an azimuth adjustment part 203 and a pitch adjustment part 204. The top of the base 202 is connected to the azimuth adjustment part 203. The specific connection form can be Figure 2 The top of the azimuth adjustment part 203 is connected to the pitch adjustment part 204, and the specific connection form can be Figure 2 The hinged form may also be other connection methods that can achieve pitch adjustment. The pitch adjustment part 204 is provided with an adapter connection hole 201 for connecting with a transmitting terminal or a receiving terminal; at the same time, the bottom of the base 202 is a clamp-shaped structure or other detachable connection structure.

[0060] The transmitting terminal accommodating device is a key component of the transmitting terminal, and includes a transmitting terminal accommodating device base 103, a transmitting terminal accommodating device side cover 104 and a transmitting terminal accommodating device bottom cover 105;

[0061] The transmitting terminal accommodating device base 103 is a semi-enclosed structure surrounded by three side panels and a top panel, the transmitting terminal accommodating device side cover 104 is connected to the unenclosed side of the transmitting terminal accommodating device base 103, the transmitting terminal accommodating device bottom cover 105 and the transmitting terminal accommodating device base 103 and the transmitting terminal accommodating device side cover 104 are connected to each other through M2.5 screws, the transmitting terminal accommodating device base 103 and the laser diode 303 are connected through M2 screws, the transmitting terminal accommodating device base 103 and the signal modulation device are connected through M2 copper columns, a light emitting hole 102 is opened on the top plate of the transmitting terminal accommodating device side cover 104, a circular ring boss is provided at the position of the light emitting hole 102 of the transmitting terminal accommodating device, and the circular ring boss is provided with an internal thread for connecting with the emitting window 304, so as to facilitate the emitting window The assembly of the mouth, the annular boss matches the position of the light emitting device; an upper azimuth pitch adjustment device connecting hole 101 is provided on the bottom cover 105 of the transmitting terminal accommodating device, which is used to connect with the azimuth pitch adjustment device; an annular boss is provided at the position of the light emitting hole 102 of the transmitting terminal accommodating device, and the annular boss is provided with an internal thread for connecting with the transmitting window 304, which is convenient for the assembly of the transmitting window, and the annular boss matches the position of the light emitting device, four threaded holes are opened on the side of the transmitting terminal accommodating device base 103 close to the transmitting terminal accommodating device side cover 104 for connecting with the signal modulation device, and two threaded holes are opened under the annular boss for fixing the laser diode 303, and at the same time, the transmitting terminal accommodating device side cover 104 is opened with a straight slot hole and a circular through hole, which is convenient for the connection between the signal interface of the signal modulation device and the power supply line.

[0062] The receiving terminal accommodating device is a key component of the receiving end, including a receiving terminal accommodating device base 503, a receiving terminal accommodating device side cover 504 and a receiving terminal accommodating device bottom cover 505;

[0063] The receiving terminal accommodating device base 503 is a semi-enclosed structure surrounded by three side panels and a top panel, the receiving terminal accommodating device side cover 504 is connected to the unenclosed side of the receiving terminal accommodating device base 503, the receiving terminal accommodating device bottom cover 505 is connected to the receiving terminal accommodating device base 503 and the receiving terminal accommodating device side cover 504 is connected to each other through M2.5 screws, the receiving terminal accommodating device base 503 is connected to the receiving lens barrel 602 through M2.5 screws, the receiving terminal accommodating device base 503 is connected to the modulation circuit board 605 through M2 copper columns, and the receiving terminal accommodating device base 503 is also connected to the power supply device through M2 copper columns; a light receiving hole 501 is opened on the top panel of the receiving terminal accommodating device base 503 so that the signal light reaches the photodetector 603, the receiving terminal accommodating device bottom cover 505 is provided with a bottom opening 502, and the receiving terminal accommodating device side cover 504 is opened with a square hole to facilitate power supply to the light receiving modulation circuit board 605.

[0064] The signal modulation device includes a signal modulation circuit board 401 and a signal output head 402; the signal modulation circuit board 401 is connected to the transmitting terminal accommodation device, and the signal output head 402 is arranged on the signal modulation circuit board 401. The power supply device includes a power supply circuit board 701 and a power interface 702; the power supply circuit board 701 is connected to the receiving terminal accommodation device, and the power interface 702 is arranged on the circuit board 701.

[0065] See also Figures 3 to 5The driving circuit of the direct modulation light emitting device in the signal modulation device is designed according to the PI characteristic. The modulation signal EN-P (EN-N) is transformed into a rectangular pulse signal with a steeper edge through the Schmitt trigger by using the positive feedback in the state conversion process to ensure the accuracy and effectiveness of the input signal and avoid the distortion of the input signal caused by the long distance transmission. The input end of the logic "AND" gate is connected to the shaped standard input signal and the temperature sensor signal respectively. The temperature sensor is used to monitor the temperature of the transistor to avoid the high temperature of the transistor passing through the transistor and burning the device to affect the modulation efficiency. The input end of the signal is not loaded on the base of the transistor, but by controlling the on and off between the three laser emitters and the ground, the purpose of controlling the light emitting device is achieved. The CI end is designed as the power control end, that is, the power of the light emitting device is controlled by the size of the voltage loaded on the base of the transistor. At the same time, in order to facilitate the different needs of the access signal and improve the system compatibility, two level format inputs are designed. When the input signal is TTL level, EN-P and EN-N are two independent input terminals, which can be used separately. When the input signal is LVDS level, the switch is connected to the logic AND gate after the input signal passes through the integrated operational amplifier. The modulation effect of the two is the same. The modulation circuit board 605 includes a primary amplification unit, a filtering unit, a secondary amplification unit and a signal processing unit. In the design, the optimization and noise suppression of the performance of the photodetector 603 are crucial. In view of the significant effect of the reverse bias voltage on the dark current and the device capacitance, 2V is selected as the reverse bias voltage value to balance the minimization of the dark current and the sensitivity of the device response. In order to accurately process signals that change over time, the amplifier must have efficient signal amplification capabilities. However, in this process, noise will inevitably be introduced between the amplifier ground and the power supply voltage. In order to effectively reduce this noise source, a voltage regulator chip is used to independently and stably supply power to the reverse bias voltage of the photodetector, the amplifier operating voltage and the power supply voltage. In order to take into account the low noise and high sensitivity advantages of high impedance preamplification and the high bandwidth and wide dynamic range characteristics of low impedance preamplification, the mutual impedance preamplification method is introduced to ensure the high sensitivity and signal-to-noise ratio in weak signal detection, and broaden the bandwidth and dynamic range of the signal. Before the signal is secondary amplified, it is necessary to filter the signal. The function of the filter circuit module is mainly to suppress the noise of the circuit, improve the signal-to-noise ratio and limit the bandwidth of the entire signal preprocessing circuit. In the signal preprocessing stage, a first-order analog low-pass filter circuit is used to complete the function of the filter circuit, and then digital filtering is used for further signal processing when the host computer is processing. In order to ensure the stable operation of the amplifier, the amplifier must work in a deep negative feedback state, and the output signal needs to be amplified again in the form of a secondary amplifier circuit; at the same time, the secondary amplifier circuit also plays the role of impedance matching with the subsequent circuit.In order to calculate the light intensity of the input signal, the signal needs to be converted from analog to digital so as to calculate the light intensity. A 16-bit successive approximation analog-to-digital converter is selected. Finally, the FPGA processor is used to complete the information decoding and light intensity calculation. The power supply circuit board 701 uses a pin-in method with the modulation circuit board 605 and adopts a 24V voltage power supply.

[0066] See also Figure 6 and Figure 7 The laser diode 303 emits 450nm±2nm light, and the light-emitting fiber is a 105μm multimode fiber. According to the communication distance of 20m, the communication rate of 10Mbps and other indicators, the aspheric lens 301 is designed to have an effective aperture of 8mm, a focal length of 14.58mm, a refractive index of 1.58, and an Abbe number of 59.39. The beam divergence angle is controlled by adjusting the position of the optical fiber, and finally the beam divergence angle reaches 7-8mrad; the effective aperture of the Fresnel lens 601 is 88mm, the focal length is 14.58mm, the refractive index is 1.49, and the Abbe number is 57.44; the effective aperture of the narrowband filter 604 is 88mm, the focal length is 14.58mm, the refractive index is 1.49, and the Abbe number is 57.44; the effective aperture of the narrowband filter 604 is 88mm, the focal length is 14.58mm, the refractive index is 1.49, and the Abbe number is 57.44. The aperture is 24mm, the refractive index is 1.52, the Abbe number is 64.2, the central transmission wavelength is 450nm, the bandwidth is 40-50nm, the peak transmittance is 90%, and the cut-off wavelength transmittance is less than 2%. The design mainly considers the problem of narrow-band filter blocking light. The size and position of the receiving target surface of the photodetector 603 are the main determining factors. The final design determines that the distance between the Fresnel lens 601 and the narrow-band filter 604 is 17mm, and the distance between the narrow-band filter 604 and the photodetector 603 is 6.1mm. The typical wavelength of the laser diode 303 is 450nm, and the maximum modulation rate is 10Mbps.

[0067] In terms of power grid data transmission, power laser communication devices can be used to transmit power grid operation data in real time, including key parameters such as voltage, current, and power. They can also transmit the status information of power grid equipment in real time through laser communication, promptly discover and locate fault points, and improve the reliability and stability of the power grid. In terms of power grid security protection, power laser communication devices have high directionality and anti-interference properties, and are suitable for encrypted communications in power grid security protection to ensure the security of power data transmission. In power grid emergencies, power laser communication devices can be used as a backup communication method to ensure the rapid and accurate transmission of emergency command information. In complex terrain environments such as mountainous areas and deserts, power laser communication devices can be used as a supplement to traditional communication methods to achieve reliable transmission of power data. Specifically, Figure 8 and Fig. 9 As shown in , the transmitting terminal and the receiving terminal of the portable electric laser communication device are both connected to the pole, or the transmitting terminal or the receiving terminal of the portable electric laser communication device has one end fixed on the pole and the other end fixed on the ground.

[0068] This optical signal transmission mechanism realizes efficient optical communication by utilizing the collimation function of the aspheric lens 301, the large aperture and short focal length characteristics of the Fresnel lens 601, and the filtering ability of the narrowband filter 604. Through the synergistic effect of photoelectric conversion and optical lens, the optical signal is transmitted in free space and received and processed by the photodetector 603. This optical path design based on the aspheric lens 301 and the Fresnel lens 601 provides lower optical loss and higher transmission efficiency, providing important guarantee for the stability and reliability of the optical communication system.

[0069] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A portable electric laser communication device, characterized in that: The invention comprises a transmitting terminal and a receiving terminal, wherein the transmitting terminal comprises a transmitting terminal accommodating device, a light emitting device and a signal modulating device; the light emitting device and the signal modulating device are arranged inside the transmitting terminal accommodating device, and a light emitting hole (102) is opened on the transmitting terminal accommodating device; The light emitting device comprises an aspheric lens (301), an emitting lens barrel (302), a laser diode (303), an emitting window (304) and an optical fiber (305); the emitting lens barrel (302) is fixed inside the emitting terminal accommodation device, two ends of the emitting window (304) are respectively connected to the end of the emitting lens barrel (302) and the position corresponding to the light emitting hole (102) on the emitting terminal accommodation device, the aspheric lens (301) is connected inside the emitting lens barrel (302), the laser diode (303) is connected to the emitting terminal accommodation device and the signal modulation device, and the optical fiber (305) is connected to the emitting lens barrel (302); the signal modulation device is used to load the input electrical signal into the signal light to realize the conversion from the electrical signal to the optical signal; The receiving terminal includes a receiving terminal accommodating device, a light receiving device and a power supply device; The light receiving device and the power supply device are arranged inside the receiving terminal accommodation device, and the receiving terminal accommodation device is provided with a light receiving hole (501); The optical receiving device comprises a Fresnel lens (601), a receiving lens barrel (602), a photodetector (603), a narrowband filter (604) and an optical receiving modulation circuit board (605); the receiving lens barrel (602) and the optical receiving modulation circuit board (605) are fixed inside a receiving terminal accommodation device, the Fresnel lens (601) and the narrowband filter (604) are both connected to the receiving lens barrel (602), and the photodetector (603) is arranged on the optical receiving modulation circuit board (605); and the power supply device is connected to the optical receiving modulation circuit board (605).

2. The device according to claim 1, characterized in that The bottoms of the transmitting terminal and the receiving terminal are both connected with azimuth and elevation adjustment devices; The azimuth and pitch adjustment device comprises a base (202), an azimuth adjustment part (203) and a pitch adjustment part (204); the top of the base (202) is connected to the azimuth adjustment part (203), the top of the azimuth adjustment part (203) is connected to the pitch adjustment part (204), and the bottom of the base (202) is a clamp-shaped structure.

3. The device according to claim 1, characterized in that The transmitting terminal accommodating device comprises a transmitting terminal accommodating device base (103), a transmitting terminal accommodating device side cover (104) and a transmitting terminal accommodating device bottom cover (105); The transmitting terminal accommodating device base (103) is a semi-enclosed structure surrounded by three side panels and a top panel, the transmitting terminal accommodating device side cover (104) is connected to the unenclosed side of the transmitting terminal accommodating device base (103), the transmitting terminal accommodating device bottom cover (105) is connected to the bottom of the transmitting terminal accommodating device base (103) and the transmitting terminal accommodating device side cover (104), and a light emitting hole (102) is opened on the top panel of the transmitting terminal accommodating device side cover (104).

4. The device according to claim 1, characterized in that The receiving terminal accommodating device comprises a receiving terminal accommodating device base (503), a receiving terminal accommodating device side cover (504) and a receiving terminal accommodating device bottom cover (505); The receiving terminal accommodating device base (503) is a semi-enclosed structure surrounded by three side panels and a top panel, the receiving terminal accommodating device side cover (504) is connected to the unenclosed side of the receiving terminal accommodating device base (503), the receiving terminal accommodating device bottom cover (505) is connected to the receiving terminal accommodating device base (503) and the bottom of the receiving terminal accommodating device side cover (504), and a light receiving hole (501) is opened on the top panel of the receiving terminal accommodating device base (503).

5. The device according to claim 1, characterized in that The signal modulation device comprises a signal modulation circuit board (401) and a signal output head (402); The signal modulation circuit board (401) is connected to the transmitting terminal accommodation device, and the signal output head (402) is arranged on the signal modulation circuit board (401).

6. The device according to claim 1, characterized in that The power supply device comprises a power supply circuit board (701) and a power supply interface (702); The power supply circuit board (701) is connected to the receiving terminal accommodation device, and the power supply interface (702) is arranged on the circuit board (701).

7. The device according to claim 1, characterized in that A circular ring-shaped boss is provided at the position of the light emission hole (102) in the emission terminal accommodation device, and the circular ring-shaped boss is provided with an internal thread for connecting with the emission window (304).

8. The device according to claim 1, characterized in that The Fresnel lens (601) has an effective aperture of 88 mm, a focal length of 14.58 mm, a refractive index of 1.49, and an Abbe number of 57.44; the narrowband filter (604) has an effective aperture of 24 mm, a refractive index of 1.52, an Abbe number of 64.2, a central transmission wavelength of 450 nm, and a bandwidth of 40-50 nm.

9. The device according to claim 1, characterized in that The aspheric lens (301) has an effective aperture of 8 mm, a focal length of 14.58 mm, a refractive index of 1.58, an Abbe number of 59.39, and a beam divergence angle of 7-8 mrad.

10. The device according to claim 1, characterized in that The typical wavelength of the laser diode (303) is 450nm, and the maximum modulation rate is 10Mbps.

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