Full-duplex signal transmission device based on free space optical communication

Abstract

The application relates to the field of optical communication and provides a full-duplex signal transmission device based on free space optical communication, which comprises a rotatable first device and a second device; the rotation axes of the first device and the second device coincide; when the first device and / or the second device rotates around the rotation axis, the optical signal emitted by a first laser transmitter is always received by a first laser receiver, so that the light intensity received by the first laser receiver is unchanged during rotation; when the first device and / or the second device rotates around the rotation axis, the optical signal emitted by a second laser transmitter is received by one second laser receiver or at least two adjacent second laser receivers. The application can realize high-speed full-duplex signal transmission in a rotating state, supports transmission rates of 10 Gbps, 25 Gbps and the like, and the sizes of the first device and the second device are as small as several mm, so that the device is small in volume and light in weight.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and more specifically to a full-duplex signal transmission device based on free-space optical communication. Background Technology

[0002] Optical communication technology has been widely used in applications such as the construction of next-generation mobile communication core networks and access networks, fixed communication links, and remote monitoring. For example, long-distance communication links between cities utilize the low-loss characteristics of optical communication to build backbone transmission networks; environmental monitoring systems in remote areas rely on optical communication to achieve stable backhaul of high-definition images and other data. In these existing scenarios, optical communication devices mostly operate in a fixed state, and there is usually no relative movement between the transmitting and receiving ends.

[0003] Existing optical communication devices can achieve full-duplex signal transmission in a stationary state. These devices typically employ a point-to-point fixed optical path design, establishing a bidirectional optical signal transmission link by precisely aligning the laser transmitter and receiver. In applications where the equipment remains stationary or experiences only minor displacement, they can meet basic communication requirements and achieve bidirectional signal transmission at a certain rate, finding some applications in fields where motion requirements are not high.

[0004] In emerging fields such as industrial automation, aerospace, and medical equipment, high-speed and stable signal transmission between relatively moving components is often required. For example, the rotating joints of industrial robots need to transmit control commands and sensor data in real time. Satellites require bidirectional interaction of numerous images and control signals between their rotating payloads and fixed platforms. Medical CT equipment also requires full-duplex signal transmission between its rotating scanning components and fixed control units. Free-space optical communication, with its advantages of high bandwidth and strong resistance to electromagnetic interference, is well-suited for these new application scenarios. However, existing optical communication devices cannot achieve full-duplex signal transmission during rotation, thus failing to meet the requirements of these new applications. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a full-duplex signal transmission device based on free-space optical communication.

[0006] In a first aspect, this application provides a full-duplex signal transmission device based on free-space optical communication, the full-duplex signal transmission device comprising: a rotatable first device and a second device; the rotation axes of the first device and the second device coincide.

[0007] The first device includes a central lens and a peripheral lens group. The peripheral lens group includes multiple peripheral lenses. The center of the central lens and the geometric center of the peripheral lens group are both located on the rotation axis. The peripheral lens group is arranged in a circular array around the central lens.

[0008] The second device includes a central lens and a peripheral lens group. The peripheral lens group includes multiple peripheral lenses. The center of the central lens and the geometric center of the peripheral lens group are both located on the rotation axis. The peripheral lens group is arranged in a circular array around the central lens.

[0009] The first device includes a first laser emitter, and the second device includes a first laser receiver. The first laser emitter is configured to correspond to the central lens of the first device, and the first laser receiver is configured to correspond to the central lens of the second device. When the first device and / or the second device rotates around the rotation axis, the light signal emitted by the first laser emitter is always received by the first laser receiver, so that the light intensity received by the first laser receiver remains unchanged during rotation.

[0010] The first device includes a number of second laser receivers equal to the number of peripheral lenses. The second device includes a second laser emitter. Each second laser receiver corresponds to a peripheral lens of the first device, and each second laser emitter corresponds to a peripheral lens of the second device. When the first device and / or the second device rotates about a rotation axis, the light signal emitted by the second laser emitter is received by one second laser receiver or at least two adjacent second laser receivers.

[0011] In some embodiments, when all the peripheral lenses of the peripheral lens group in the first device and the second device are projected onto the plane where the central lens is located, the center of all the peripheral lenses is equidistant from the center of the central lens.

[0012] In some embodiments, the number of peripheral lens groups is at least two, and the different groups of peripheral lens groups are distributed on the circumference of circles of different radii centered on the center lens.

[0013] In some embodiments, the first optical path of the first laser receiver and the first laser emitter is separated from the second optical path of the second laser receiver and the second laser emitter.

[0014] In some embodiments, the first device and / or the second device includes a first reference surface and a second reference surface, the central lens is disposed on the first reference surface, and the peripheral lens group is disposed on the second reference surface.

[0015] In some embodiments, the first reference plane is higher than the second reference plane, or the first reference plane is lower than the second reference plane;

[0016] "Higher" means the reference plane is closer to another component, and "lower" means the reference plane is farther away from another component.

[0017] In some embodiments, there are multiple central lenses and at least two peripheral lens groups. One central lens and at least one peripheral lens group are disposed on a first reference plane, and one central lens and at least one peripheral lens group are disposed on a second reference plane.

[0018] In some embodiments, the central lens and the peripheral lens group in the first device and / or the second device are disposed on the same plane.

[0019] In some embodiments, the central lens and the peripheral lens are any one of a circle, an ellipse, or a polygon.

[0020] In some embodiments, the surface shape of the central lens and the peripheral lens is any one of a standard spherical surface, an aspherical surface, a Fresnel surface, or a freeform surface.

[0021] This application provides a full-duplex signal transmission device based on free-space optical communication. The center of the central lens and the geometric center of the peripheral lens group are both located on the rotation axis. The peripheral lens group is arranged in a circular array around the central lens. A first laser transmitter is set corresponding to the central lens of the first device, and a first laser receiver is set corresponding to the central lens of the second device. The second device includes a second laser transmitter. Each second laser receiver is set corresponding to one peripheral lens of the first device, and each second laser transmitter is set corresponding to one peripheral lens of the second device. High-speed full-duplex signal transmission in a rotating state can be realized, and transmission rates such as 10Gbps and 25Gbps are supported. The size of the first device and the second device is as small as a few millimeters, making them small in size and light in weight. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a full-duplex signal transmission device based on free-space optical communication provided in an embodiment of this application.

[0023] Figure 2 This is a first structural schematic diagram of a first embodiment of the first device provided in this application.

[0024] Figure 3 This is a second structural schematic diagram of the first embodiment of the first device provided in this application.

[0025] Figure 4This is a schematic diagram of the structure of a second embodiment of the first device provided in this application.

[0026] Figure 5 This is a schematic diagram of the structure of a third embodiment of the first device provided in this application.

[0027] Figure 6 This is a schematic diagram of the fourth embodiment of the first device provided in this application.

[0028] Figure 7 This is a schematic diagram of the fifth embodiment of the first device provided in this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] This application provides a full-duplex signal transmission device based on free-space optical communication. The center of the central lens and the geometric center of the peripheral lens group are both located on the rotation axis. The peripheral lens group is arranged in a circular array around the central lens. A first laser transmitter is set corresponding to the central lens of the first device, and a first laser receiver is set corresponding to the central lens of the second device. The second device includes a second laser transmitter. Each second laser receiver is set corresponding to one peripheral lens of the first device, and each second laser transmitter is set corresponding to one peripheral lens of the second device. High-speed full-duplex signal transmission in a rotating state can be realized, and transmission rates such as 10Gbps and 25Gbps are supported. The size of the first device and the second device is as small as a few millimeters, making them small in size and light in weight.

[0032] The full-duplex signal transmission device based on free-space optical communication provided in this application can be applied to mobile telecommunications services, such as in the construction of next-generation mobile communication core networks and access networks, and fiber optic broadband operation services. For example, the full-duplex signal transmission device can be used in the connection network between the core network and the access network. Using the full-duplex signal transmission device based on free-space optical communication provided in this application, free-space optical communication over a certain distance can be achieved, reducing the installation of optical fibers or communication cables, thereby reducing the construction cost of broadband networks. Furthermore, it can also achieve high-speed, full-duplex, and high-bandwidth communication.

[0033] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of the full-duplex signal transmission device based on free-space optical communication provided in the embodiments of this application. Figure 2 This is a first structural schematic diagram of a first embodiment of the first device provided in this application. Figure 3 This is a second structural schematic diagram of a first embodiment of the first device provided in this application. (See attached diagram.) Figure 1 As shown, in some embodiments, the full-duplex signal transmission device based on free-space optical communication includes: a rotatable first device 1 and a second device 1', wherein the rotation axes T of the first device 1 and the second device 1' coincide.

[0034] The first device 1 includes a central lens A1 and a peripheral lens group B, wherein the peripheral lens group B includes multiple peripheral lenses. Figures 1 to 4 Taking the peripheral lens group B, which includes six peripheral lenses, as an example.

[0035] like Figure 2 As shown, the peripheral lens group B includes peripheral lens B1, peripheral lens B2, peripheral lens B3, peripheral lens B4, peripheral lens B5 and peripheral lens B6.

[0036] like Figure 1 As shown, the center of the central lens A1 and the geometric center of the peripheral lens group B both lie on the rotation axis T. The peripheral lens group B is arranged in a circular array around the central lens A1. The geometric center of the peripheral lens group refers to the geometric center of the closed shape formed by connecting the centers of adjacent peripheral lenses in sequence. The circular array arrangement of the peripheral lens group around the central lens means that when all the peripheral lenses are projected onto the plane containing the central lens, the distance between the center of all the peripheral lenses and the center of the central lens is equal.

[0037] It is understood that the number of peripheral lens groups B in this application is not limited to six embodiments; multiple groups are acceptable. Figures 1 to 4 The number of peripheral lens groups B in the illustrated embodiments should not be construed as a limitation on this application.

[0038] like Figure 1 As shown, the second device 1′ includes a central lens A2 and a peripheral lens group B′. The peripheral lens group B′ includes multiple peripheral lenses. The center of the central lens A2 and the geometric center of the peripheral lens group B′ are both located on the rotation axis T. The peripheral lens group B′ is distributed in a circular array around the central lens A2.

[0039] The first device 1 includes a first laser emitter 2, and the second device 1' includes a first laser receiver 3. The first laser emitter 2 is positioned corresponding to the central lens A1 of the first device 1, and the first laser receiver 3 is positioned corresponding to the central lens A2 of the second device 1'. When the first device 1 and / or the second device 1' rotates around the rotation axis T, the light signal emitted by the first laser emitter 2 is always received by the first laser receiver 3, so that the light intensity received by the first laser receiver 3 remains unchanged during rotation. The light signal emitted by the first laser emitter 2 passes through the central lens A1 and the central lens A2 before reaching the first laser receiver 3.

[0040] The first device 1 includes a second laser receiver in number equal to the number of peripheral lenses. Figures 1 to 4 In the illustrated embodiment, there are six peripheral lenses, therefore there are also six second laser receivers: second laser receiver 31, second laser receiver 32, second laser receiver 33, second laser receiver 34, second laser receiver 35, and second laser receiver 36. The second device 1' includes a second laser emitter 2', and each second laser receiver corresponds to one peripheral lens of the first device 1. Figure 1 and Figure 2 It can be clearly seen that the second laser receiver 31 is set to correspond to the peripheral lens B1 of the first device 1, the second laser receiver 32 is set to correspond to the peripheral lens B2 of the first device 1, the second laser receiver 33 is set to correspond to the peripheral lens B3 of the first device 1, the second laser receiver 34 is set to correspond to the peripheral lens B4 of the first device 1, the second laser receiver 35 is set to correspond to the peripheral lens B5 of the first device 1, and the second laser receiver 36 is set to correspond to the peripheral lens B6 of the first device 1.

[0041] The second laser emitter 2′ corresponds to the peripheral lens arrangement of a second device 1′. For example, Figures 1 to 2 The second laser emitter 2′ is positioned corresponding to the peripheral lens B1′ of the second device 1′. When the first device 1 and / or the second device 1′ rotates about the rotation axis T, the optical signal emitted by the second laser emitter 2′ is received by a second laser receiver or at least two adjacent second laser receivers.

[0042] For example, the number of peripheral lenses included in the peripheral lens group B' of the second device 1' is the same as the number of peripheral lenses included in the peripheral lens group B of the first device 1. In this way, the first and second devices are identical when the laser receiver and laser emitter are not installed, and can be manufactured using the same manufacturing process, thereby saving costs.

[0043] Optionally, the first device 1 and the second device 1' are the same in terms of the number of lenses, the position of the lenses, and the structure. The difference lies in the arrangement of the laser emitter and the laser receiver. Therefore, the description of the lenses and structure of the second device 1' can be referred to the first device 1, and will not be repeated here or thereafter.

[0044] Please refer to the following: Figure 2 and Figure 3 The structure of the first device 1 will be further described below. The structure of the second device 1′ can be referred to the description of the first device 1.

[0045] Specifically, the first device 1 includes four reference surfaces, namely reference surface 11, reference surface 12, reference surface 13, and reference surface 14. For example... Figure 2 As shown, a central lens A1 is provided on the reference plane 12, and peripheral lenses B1, B2, B3, B4, B5 and B6 are provided on the reference plane 14. The peripheral lenses B1 to B6 are arranged in a circular array around the central lens A1.

[0046] Optionally, the focal length of the central lens A1 is the distance between the reference plane 11 and the reference plane 12, and the focal lengths of the peripheral lenses B1 to B6 are the distance between the reference plane 11 and the reference plane 14.

[0047] Among them, the reference plane 12 where the central lens A1 is located is defined as the first reference plane, and the reference plane 14 where the peripheral lens B1 is located is defined as the second reference plane.

[0048] In some embodiments, the first device and / or the second device includes a first reference surface and a second reference surface, with a central lens disposed on the first reference surface and a peripheral lens group disposed on the second reference surface.

[0049] The fact that the peripheral lenses B1 to B6 are arranged in a circular array around the central lens A1 can be understood as follows: when all the peripheral lenses of the peripheral lens group in the first and second devices are projected onto the plane where the central lens is located, the distance between the center of all the peripheral lenses and the center of the central lens is equal.

[0050] In some implementations, all peripheral lenses in the peripheral lens group are uniformly distributed. Specifically, the angles formed by the lines connecting the centers of adjacent peripheral lenses to the geometric center of the peripheral lens group are equal. For example, when the peripheral lens group includes six peripheral lenses, the angle between the lines connecting the centers of adjacent peripheral lenses to the geometric center of the peripheral lens group is 60 degrees.

[0051] Figure 3 The central lens A1 is projected onto the reference plane 14 where the peripheral lens group is located, resulting in the central lens projection A1′. It can be clearly seen that the center of all peripheral lenses is equidistant from the center of the central lens projection A1′, thus all peripheral lenses of the peripheral lens group are arranged in a circular array around the central lens.

[0052] Optionally, the boundary of the central lens may be tangent to, separate from, or intersect with the boundary of the peripheral lens.

[0053] Optionally, the boundary of the projection of the central lens onto the second reference plane may be tangent to, separate from, or intersect with the boundary of the peripheral lens; this application does not impose any restrictions on this.

[0054] like Figure 3 As shown, exemplarily, the boundary of the central lens projection A1′ is tangent to the boundaries of the peripheral lenses B1 to B6.

[0055] Optionally, the boundaries of peripheral lenses B1 to B6 may be tangent to each other, separate from each other, or intersect each other; this application does not impose any restrictions.

[0056] In some implementations, the first optical path of the first laser receiver and the first laser transmitter is separated from the second optical path of the second laser receiver and the second laser transmitter. This prevents optical signals emitted by different laser transmitters from being received by non-corresponding laser receivers.

[0057] Optionally, the shape of the central lens A1 and the peripheral lenses B1 to B6 can be any one of a circle, an ellipse, or a polygon.

[0058] Optionally, the surface shape of the central lens A1 and peripheral lenses B1 to B6 can be any one of a standard spherical surface, an aspherical surface, a Fresnel surface, or a freeform surface.

[0059] In some embodiments, the central lens and peripheral lens group in the first device and / or the second device are disposed on the same plane, that is, the reference plane 13 and the reference plane 14 can be on the same plane.

[0060] In some implementations, reference plane 14 is higher than reference plane 13, for example... Figures 1 to 3As shown in the embodiments, a convex structure is formed. In other embodiments, the reference surface 14 is lower than the reference surface 13, forming a concave structure, depending on the application scenario and design, which is not limited in this application. Here, "higher" means that the reference surface is closer to another component, and "lower" means that the reference surface is farther away from another component.

[0061] In some embodiments, the central lens and peripheral lens group in the first and / or second devices are disposed on different planes. For example, the central lens is disposed on a first reference plane, and the peripheral lens group is disposed on a second reference plane, the first and second reference planes being different. In this case, a portion of the reference plane located in the optical path of the optical signal is transparent, allowing the optical signal to pass through the reference plane for transmission and reception. This portion of the reference plane may also be a lens.

[0062] Next, combine Figure 1 Describe in detail the optical communication state when the first device 1 and the second device 1' are in a static state.

[0063] In the stationary state, the rotation axis T of the first device 1 and the second device 1' coincides, the central lens A1 of the first device 1 and the central lens A2 of the second device 1' are concentrically corresponding, and the six peripheral lenses of the first device 1 and the six peripheral lenses of the second device 1' are concentrically corresponding.

[0064] The first laser emitter 2 of the first device 1 emits a light signal. The light signal enters free space through the central lens A1 and is transmitted. After transmitting a certain distance, it passes through the central lens A2 and hits the first laser receiver 3 of the second device 1'. Thus, the second device 1' receives the light signal, realizing signal transmission in the first direction.

[0065] The second laser transmitter 2' of the second device 1' emits an optical signal. The optical signal passes through the peripheral lens B1' and enters free space for transmission. After transmitting a certain distance, it passes through the peripheral lens B1 of the first device 1 and hits the second laser receiver 31, thus the first device 1 receives the optical signal, realizing signal transmission in the second direction, which is opposite to the first direction. Thus, full-duplex communication in a stationary state is realized.

[0066] The optical communication state when the first device 1 and the second device 1' rotate relative to each other is described in detail below. Figures 1 to 4 The system includes a peripheral lens group consisting of six peripheral lenses, with an angle of 60° between any two adjacent peripheral lenses.

[0067] a. When the first device 1 and the second device 1′ rotate relative to each other by 0°, as in the static state, the second laser emitter 2′ of the second device 1′ emits a light signal. The light signal enters the free space through the peripheral lens B1′ and is transmitted. After transmitting a distance, it hits the second laser receiver 31 through the peripheral lens B1 of the first device 1, so that the first device 1 receives the light signal and realizes the signal transmission in the second direction.

[0068] b. When the first device 1 and the second device 1' rotate relative to each other by 60°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters the free space through the peripheral lens B1' and is transmitted. After transmitting a distance, it passes through the peripheral lens B2 of the first device 1 and hits the second laser receiver 32, so that the first device 1 receives the light signal and realizes the signal transmission in the second direction.

[0069] c. When the first device 1 and the second device 1' rotate relative to each other by 120°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters the free space through the peripheral lens B1' and is transmitted. After transmitting a distance, it passes through the peripheral lens B3 of the first device 1 and hits the second laser receiver 33, so that the first device 1 receives the light signal and realizes the signal transmission in the second direction.

[0070] d. When the first device 1 and the second device 1′ rotate 180° relative to each other, the second laser emitter 2′ of the second device 1′ emits a light signal. The light signal enters the free space through the peripheral lens B1′ and is transmitted. After transmitting a distance, it passes through the peripheral lens B4 of the first device 1 and hits the second laser receiver 34, so that the first device 1 receives the light signal and realizes the signal transmission in the second direction.

[0071] e. When the first device 1 and the second device 1' rotate relative to each other by 240°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters the free space through the peripheral lens B1' and is transmitted. After transmitting a distance, it passes through the peripheral lens B5 of the first device 1 and hits the second laser receiver 35, so that the first device 1 receives the light signal and realizes the signal transmission in the second direction.

[0072] f, when the first device 1 and the second device 1' rotate relative to each other by 300°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters the free space through the peripheral lens B1' and is transmitted. After transmitting a distance, it passes through the peripheral lens B6 of the first device 1 and hits the second laser receiver 36, so that the first device 1 receives the light signal and realizes the signal transmission in the second direction.

[0073] g. When the first device 1 and the second device 1' rotate relative to each other by 360°, the state is the same as when the first device 1 and the second device 1' rotate relative to each other by 0°. The second laser emitter 2' of the second device 1' emits a light signal. The light signal enters the free space through the peripheral lens B1' and is transmitted. After transmitting a distance, it hits the second laser receiver 31 through the peripheral lens B1 of the first device 1, so that the first device 1 receives the light signal and realizes the signal transmission in the second direction.

[0074] h, when the first device 1 and the second device 1′ rotate relative to each other from 0° to 60°, the second laser emitter 2′ of the second device 1′ emits a light signal. The light signal enters the free space through the peripheral lens B1′ and is transmitted. After transmitting a certain distance, the peripheral lenses B1 and B2 of the first device 1 simultaneously receive the light signal. The light signal hits the second laser receiver 31 and the second laser receiver 32. The light intensity of the light signal received by the first device is the sum of the light intensities of the light signals received by the second laser receiver 31 and the second laser receiver 32, thus realizing signal transmission in the second direction.

[0075] i. When the first device 1 and the second device 1' rotate relative to each other by 60°~120°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters free space through the peripheral lens B1' and is transmitted. After transmitting a certain distance, the peripheral lenses B2 and B3 of the first device 1 simultaneously receive the light signal. The light signal hits the second laser receiver 32 and the second laser receiver 33. The light intensity of the light signal received by the first device is the sum of the light intensities of the light signals received by the second laser receiver 32 and the second laser receiver 33, thus realizing signal transmission in the second direction.

[0076] When the first device 1 and the second device 1' rotate relative to each other by 120°~180°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters free space through the peripheral lens B1' and is transmitted. After transmitting a certain distance, the peripheral lenses B3 and B4 of the first device 1 simultaneously receive the light signal. The light signal hits the second laser receiver 33 and the second laser receiver 34. The light intensity of the light signal received by the first device is the sum of the light intensities of the light signals received by the second laser receiver 33 and the second laser receiver 34, thus realizing signal transmission in the second direction.

[0077] When the first device 1 and the second device 1' rotate relative to each other by 180°~240°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters free space through the peripheral lens B1' and is transmitted. After transmitting a certain distance, the peripheral lenses B4 and B5 of the first device 1 simultaneously receive the light signal. The light signal hits the second laser receiver 34 and the second laser receiver 35. The light intensity of the light signal received by the first device is the sum of the light intensities of the light signals received by the second laser receiver 34 and the second laser receiver 35, thus realizing signal transmission in the second direction.

[0078] When the first device 1 and the second device 1' rotate relative to each other by 240°~300°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters free space through the peripheral lens B1' and is transmitted. After transmitting a certain distance, the peripheral lenses B5 and B6 of the first device 1 simultaneously receive the light signal. The light signal hits the second laser receiver 35 and the second laser receiver 36. The light intensity of the light signal received by the first device is the sum of the light intensities of the light signals received by the second laser receiver 35 and the second laser receiver 36, thus realizing signal transmission in the second direction.

[0079] When the first device 1 and the second device 1' rotate relative to each other by 300°~360°, the second laser emitter 2' of the second device 1' emits a light signal. The light signal enters the free space through the peripheral lens B1' and is transmitted. After transmitting a certain distance, the peripheral lenses B6 and B1 of the first device 1 simultaneously receive the light signal. The light signal hits the second laser receiver 36 and the second laser receiver 31. The light intensity of the light signal received by the first device is the sum of the light intensities of the light signals received by the second laser receiver 36 and the second laser receiver 31, thus realizing signal transmission in the second direction.

[0080] Thus, full-duplex communication under continuous rotation is realized.

[0081] The following sections will introduce more different alternative embodiments of the first and second devices.

[0082] Example 2, please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of a second embodiment of the first device provided in this application. Specifically, as shown... Figure 4 As shown, the central lens A1 and peripheral lenses B1 to B6 are all distributed on the same reference plane 12.

[0083] Example 3, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a third embodiment of the first device provided in this application. Specifically, as shown... Figure 5As shown, the central lens A1 and peripheral lenses B1 to B6 are all distributed on the same reference plane 14.

[0084] Example 4, please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of a fourth embodiment of the first device provided in this application. Specifically, as shown... Figure 6 As shown, Figure 6 The system has two central lenses and two peripheral lens groups. One central lens A1-2 and one peripheral lens group consisting of peripheral lenses B1-2, B2-2, B3-2, B4-2, B5-2, and B6-2 are positioned on reference plane 14. The other central lens A1-1 and one peripheral lens group consisting of peripheral lenses B1-1, B2-1, B3-1, B4-1, B5-1, and B6-1 are positioned on reference plane 12, thereby improving the transmission effect.

[0085] Central lens A1-1 and central lens A1-2 form a double lens, constituting central lens A1. Similarly, peripheral lenses B1-1 to B6-1 form double lenses with peripheral lenses B1-2 to B6-2, constituting peripheral lenses B1 to B6.

[0086] Example 5, please refer to Figure 7 , Figure 7 This is a schematic diagram of the fifth embodiment of the first device provided in this application. Specifically, Figure 7 The first device includes a central lens A1 and peripheral lens groups B1, C1, and D1. The three peripheral lens groups are arranged in a circular array around the central lens A1, with their geometric centers coinciding. The positions of the peripheral lens groups can be arbitrarily selected and combined between reference plane 12 and reference plane 14 without specific restrictions, catering to the diversity and specialization of application scenarios.

[0087] In some embodiments, the central lens of the first device and the central lens of the second device correspond to a first channel, and the peripheral lens group of the first device and the peripheral lens group of the second device correspond to one or more second channels, and the signal transmission and reception directions of the first channel and the second channel are different.

[0088] Specifically, the optical signal emitted by the second laser emitter is received by the first laser receiver after passing through the central lens of the first device and the central lens of the second device, thus transmitting the optical signal in the first channel. The optical signal emitted by the second laser emitter is received by the second laser receiver after passing through the peripheral lenses of the second device and the peripheral lenses of the first device, thus transmitting the optical signal in the second channel. Each set of opposing central lenses corresponds to one first channel, and each set of opposing peripheral lenses corresponds to one second channel.

[0089] Optionally, there is one second laser transmitter and multiple second laser receivers, with one second laser receiver corresponding to one second channel, thus there can be multiple second channels.

[0090] Optionally, multiple second laser receivers can simultaneously correspond to a single second channel, thereby improving the reliability of the second channel.

[0091] Optionally, there can be multiple second laser transmitters and multiple second laser receivers, with one second laser transmitter corresponding to one peripheral lens of the second device, thus allowing for multiple second channels. This not only enables multiple second channels to communicate simultaneously, significantly increasing bandwidth, but also allows for switching the correspondence between the transmitter and receiver of the second channels by rotating the first and / or second devices, greatly enhancing communication flexibility.

[0092] Optionally, one peripheral lens group of the first device corresponds to one peripheral lens group of the opposing second device, which in turn corresponds to one second channel. Specifically, in a pair of opposing peripheral lens groups, the second device has one second laser emitter, and the first device has multiple second laser receivers. The optical signal emitted by the second laser emitter can be received by different second laser receivers, and one second laser receiver can correspond to one second channel, thus allowing for multiple second channels. In this case, when the first and second devices have multiple peripheral lens groups, one peripheral lens group corresponds to multiple second channels, resulting in multiple sets of second channels corresponding to each of the multiple peripheral lens groups.

[0093] Optionally, each group of second channels has a preset priority order.

[0094] When there are multiple second channels, and the first device and / or the second device rotates around the rotation axis, the second channel for communication can be switched.

[0095] Alternatively, all information regarding switching to the second channel can be transmitted via the first channel.

[0096] In the prior art, optical communication devices cannot rotate, let alone switch communication channels by rotation. However, in this application, by controlling the first and / or second devices to rotate around a rotation axis, not only can high-speed full-duplex signal transmission be achieved during rotation, but the communication channel can also be switched by rotation. In some embodiments, channel switching can even be performed during dynamic rotation. The method for switching channels in the full-duplex signal transmission device of this application will be described in detail below.

[0097] In some embodiments, the first device is connected to a first communication device, and the second device is connected to a second communication device, enabling full-duplex signal transmission between the first and second communication devices based on free-space optical communication. Specifically, the first laser transmitter and the second laser receiver in the first device are both electrically connected to the first control unit of the first communication device, and the entire first device is connected to the first rotation drive unit of the first communication device. The first control unit controls the operation of the first laser transmitter, the second laser receiver, and the first rotation drive unit, and continues to transmit the electrical signal generated by the second laser receiver to the user end. The first rotation drive unit drives the first device to rotate. Similarly, the second laser transmitter and the first laser receiver in the second device are both electrically connected to the second control unit of the second communication device, and the entire second device is connected to the second rotation drive unit of the second communication device. The second control unit controls the operation of the second laser transmitter, the first laser receiver, and the second rotation drive unit, and continues to transmit the electrical signal generated by the first laser receiver to the user end. The second rotation drive unit drives the second device to rotate.

[0098] In some embodiments, the first control unit of the first communication device is used to continue transmitting the electrical signal generated by the second laser receiver to the corresponding user terminal, and the second control unit of the second communication device is used to continue transmitting the electrical signal generated by the first laser receiver to the corresponding user terminal.

[0099] In other embodiments, the first control unit of the first communication device is used to further transmit optical signals to the fiber optic broadband network based on the electrical signals generated by the second laser receiver; the second control unit of the second communication device is used to further transmit optical signals to the fiber optic broadband network based on the electrical signals generated by the first laser receiver.

[0100] The above methods enable free-space optical communication over a distance in broadband networks, reducing the need for fiber optic cables or communication cables and thus lowering the construction costs of broadband networks.

[0101] In some implementations, different channels transmit optical signals of different wavelengths.

[0102] In some implementations, the channels corresponding to each set of opposing peripheral lenses are pre-identified, and the reference rotation angle corresponding to each peripheral lens is pre-stored.

[0103] In some embodiments, the first and second devices further include a photoelectric encoder, which is a sensor that converts mechanical geometric displacement into digital quantities through photoelectric conversion. Here, the photoelectric encoder is used to determine the rotation angle of the device in which it resides.

[0104] In some embodiments, communication is performed using a first device and a second device, including steps S100 to S300. Steps S100 to S300 can be performed by either the first communication device or the second communication device.

[0105] Step S100: Obtain communication requirement parameters and channel parameters.

[0106] The communication requirements parameters include the target transmission rate and the communication service priority. The channel parameters include the maximum transmission rate and identifier that each second channel can support.

[0107] Optionally, the first or second communication device obtains communication requirement parameters and channel parameters through an activated first channel or other communication method.

[0108] In some implementations, different channels use optical signals of different wavelengths for transmission, and / or different channels use different encoding methods for transmission. In this case, each channel can support a different maximum transmission rate. The maximum transmission rate that a channel can support is preset based on the wavelength or encoding method of the optical signal transmitted by the channel.

[0109] As described above, each group of second channels can have a preset priority order. In some implementations, when each group of second channels has a preset priority order, the channel parameters also include the priority of each second channel.

[0110] Optionally, a higher channel priority indicates higher channel reliability and a lower bit error rate.

[0111] Optionally, the secondary channel corresponding to the peripheral lens group closer to the central lens has a higher priority. This is because when the rotation angle of the device is the same, the peripheral lens group closer to the central lens rotates a shorter distance, and with the same angular error, its error in the rotation position relative to the target is smaller.

[0112] In some implementations, channel priority is determined based on the wavelength and coding scheme of the optical signal used by each second channel. For example, optical signals with a wavelength of 1550 nanometers (nm) experience less attenuation, thus the corresponding second channel has a higher priority than channels with wavelengths in other ranges. Channels employing error-correcting coding have stronger anti-interference capabilities and therefore have a higher priority than channels without error-correcting coding.

[0113] Step S200: Determine the rotation angles of the first device and the second device based on the communication requirement parameters and channel parameters, and then communicate with them.

[0114] In some implementations, step S200 includes steps S210 to S250.

[0115] Step S210: Select a candidate second channel from all second channels based on the channel parameters, whose maximum supported transmission rate is not less than the target transmission rate.

[0116] Step S220: When the number of candidate second channels is 1, the candidate second channel is determined as the target second channel; when the number of candidate second channels is greater than or equal to 2, a candidate second channel is selected from multiple candidate second channels as the target second channel according to the communication service priority.

[0117] For example, when the service priority is "high", the candidate second channel with the highest maximum transmission rate among multiple candidate second channels is selected as the target second channel. When the service priority is "medium", the candidate second channel with the second highest maximum transmission rate among multiple candidate second channels is selected as the target second channel, so as to reserve a high-speed channel for communication services with "high" service priority. When the service priority is "low", the candidate second channel with the third highest maximum transmission rate among multiple candidate second channels is selected as the target second channel, so as to reserve a high-speed channel for communication services with "high" and "medium" service priorities.

[0118] In some implementations, when the number of candidate second channels is greater than or equal to 2, the candidate second channel with the highest priority and matching the priority of the communication service is selected as the target second channel based on the communication service priority and the priority of each second channel.

[0119] For example, when the service priority is "high", the candidate second channel with a "high" priority is selected as the target second channel. If there are multiple candidate second channels with a "high" priority, the candidate second channel with the highest maximum transmission rate is selected as the target second channel.

[0120] Step S230: Determine the target rotation angle corresponding to the target second channel based on the identifier of the target second channel and the preset mapping relationship information between the second channel identifier and the rotation angle.

[0121] The preset mapping information between the second channel identifier and the rotation angle is related to the type of device; the mapping information for the first device and the second device may be different. When step S230 is executed by the first communication device, the mapping information corresponds to the first device. When step S230 is executed by the second communication device, the mapping information corresponds to the second device.

[0122] Step S240: Control the rotation of the first or second device based on the target rotation angle to align a set of peripheral lenses corresponding to the second channel of the target, and then conduct communication.

[0123] When step S240 is executed by the first communication device, the first device is controlled to rotate based on the target rotation angle. When step S240 is executed by the second communication device, the second device is controlled to rotate based on the target rotation angle.

[0124] In some implementations, the rotary drive unit is controlled to rotate the device around the rotation axis until the difference between the detected actual rotation angle and the target rotation angle is less than a preset angle error.

[0125] Optionally, the rotary drive unit is a miniature stepper motor.

[0126] Optionally, the materials used in the first and second devices, except for the lens, are magnetic materials, and the rotation drive unit uses the principle of magnetic levitation to drive the devices to rotate. In this way, the wear and tear on mechanical parts can be greatly reduced.

[0127] In some implementations, during rotation, since two adjacent second laser receivers behind peripheral lenses simultaneously receive optical signals, the electrical signals generated by the two second laser receivers can be combined into a single electrical signal and transmitted through the target second channel. In this way, communication can be switched to the second laser receiver during rotation, improving the switching speed.

[0128] In some implementations, step S240 includes steps S241 to S243.

[0129] Step S241: During the rotation process, when the difference between the actual rotation angle of the detected device and the target rotation angle is less than a preset difference, the second laser receiver corresponding to the target second channel is turned on. The currently turned-on second laser receiver continues to work, while the other second laser receivers remain in the off state.

[0130] Step S242: Combine the electrical signals generated by the optical signals received by the two second laser receivers into one electrical signal and continue to transmit it through the target second channel.

[0131] In some implementations, during the rotation process, the first signal weight of the currently activated second laser receiver is gradually reduced based on the difference between the actual rotation angle and the target rotation angle, while the second signal weight of the second laser receiver corresponding to the target second channel is gradually increased, until the difference between the detected actual rotation angle and the target rotation angle is less than a preset angle error, at which point the second signal weight is 1 and the first signal weight is 0.

[0132] In some implementations, the electrical signals generated by the optical signals received by the two second laser receivers are first phase-synchronized and compensated, and then the two electrical signals after phase synchronization compensation are combined.

[0133] Optionally, the formula for calculating the combined electrical signals is: ,in, This represents the merged electrical signal. Indicates the weight of the first signal. Indicates the weight of the second signal. This represents the electrical signal of the currently activated second laser receiver after phase synchronization compensation. This represents the electrical signal of the second laser receiver corresponding to the second channel of the target. Indicates time. and The sum of is 1.

[0134] Optionally, the formula for calculating the weight of the second signal is: ,in, The base of the natural logarithm. This represents the difference between the actual rotation angle and the target rotation angle. This represents the calculated coefficients. These coefficients are used to control the smoothness of the changes in the weights of the second signal.

[0135] The formula for calculating the first signal weight is: .

[0136] Step S243: When the difference between the detected actual rotation angle and the target rotation angle is less than the preset angle error, keep the second laser receiver corresponding to the second channel of the target on and keep all other second laser receivers off.

[0137] In some embodiments, the central lens and / or peripheral lens described above can be liquid crystal lenses. In this case, the first and second devices further include an electronic control unit for controlling the voltage of the liquid crystal lens. The liquid crystal lens can change its refractive index when the voltage changes, thereby achieving precise adjustment of the beam direction of the light signal. Together with the rotational motion, the beam direction can be controlled at high speed and flexibly without the need for additional mechanical parts.

[0138] In some embodiments, the peripheral lenses in the peripheral lens group are all liquid crystal lenses. The liquid crystal lenses are used to fine-tune the beam direction of the optical signal to compensate for minor deviations caused by the mechanical rotation of the device, while the mechanical rotation is used to coarsely adjust the beam direction of the optical signal. In this case, step S200 also includes steps S251 to S255. The second laser receiver can also acquire the beam center coordinates of the optical signal.

[0139] Step S251: When the difference between the actual rotation angle detected by the photoelectric encoder and the target rotation angle is less than the preset angle error, the actual beam center coordinates of the optical signal are obtained.

[0140] Step S252: Determine the target beam center coordinates of the optical signal based on the target rotation angle using a preset calculation method, and calculate the refraction compensation vector of the peripheral lens corresponding to the current second channel based on the deviation between the target beam center coordinates and the actual beam center coordinates and the wavelength of the current optical signal.

[0141] Step S253: Determine the target control voltage of the peripheral lens based on the refraction compensation vector, the preset mapping relationship between the refraction compensation vector and the voltage.

[0142] In some embodiments, the refractive index distribution of the liquid crystal lens can be non-uniform. For example, the liquid crystal lens may include multiple variable refractive index annular regions, each electrically connected to an electrode of an electronic control unit. The electronic control unit controls the voltage of all variable refractive index annular regions through an electrode array to control the refractive index distribution of the liquid crystal lens.

[0143] Optionally, there are multiple target control voltages for the peripheral lens, with each target control voltage corresponding to a variable refractive index annular region.

[0144] In some implementations, the mapping information between the refractive compensation vector and the voltage includes the mapping information between the refractive compensation vector and the voltage of all variable refractive index annular regions.

[0145] Step S254: The electronic control unit outputs the target control voltage to the peripheral lens corresponding to the current second channel.

[0146] Optionally, the electronic control unit outputs a corresponding target control voltage to each variable refractive index annular region through the electrode array, thereby controlling the refractive index distribution of the entire liquid crystal lens.

[0147] Step S255: Obtain the actual beam center coordinates of the optical signal again. When the deviation between the actual beam center coordinates obtained again and the target beam center coordinates is greater than the preset coordinate deviation, return to step S252. Stop returning to step S252 when the deviation is no greater than the preset coordinate deviation, and keep the electronic control unit outputting the current target control voltage to the peripheral lens corresponding to the current second channel.

[0148] Furthermore, when the deviation between the actual beam center coordinates and the target beam center coordinates is no greater than the preset coordinate deviation, and the received light intensity fluctuation of the second laser receiver is within the preset fluctuation range, and the current bit error rate of the second channel is less than the preset bit error rate threshold, the return to step S252 is stopped, and the electronic control unit continues to output the current target control voltage to the peripheral lens corresponding to the current second channel.

[0149] In some embodiments, the device on which the apparatus is installed vibrates, causing the first and second devices to vibrate as well. The amplitude of the vibration is generally small, allowing for real-time fine-tuning of the light signal's beam direction via the liquid crystal lens, eliminating the need for mechanical rotation of the apparatus. The liquid crystal lens's rapid response to changes in refractive index enables faster adjustment of the light signal's beam direction than mechanical rotation.

[0150] In some embodiments, an inertial measurement unit (IMU) is also installed on the first and second devices. In this case, the vibration level can be determined based on the acceleration acquired by the IMU. When the vibration level is lower than a preset level, the beam direction of the optical signal is fine-tuned using only a liquid crystal lens. When the vibration level is not lower than the preset level, the beam direction of the optical signal is adjusted using a combination of mechanical rotation and a liquid crystal lens.

[0151] Specifically, the rotation angle of the rotational motion can be determined based on the direction and magnitude of the acceleration obtained by the inertial measurement unit, and then the beam direction of the light signal can be finely adjusted in real time through the liquid crystal lens, as described above.

[0152] Step S300: When a channel switching request is received, the first device and / or the second device are controlled to rotate according to the channel switching request, so as to switch to the corresponding target second channel for signal transmission.

[0153] In some implementations, a channel switching request can be triggered automatically, or a channel switching request sent by the user terminal can be received.

[0154] In some implementations, the automatic triggering conditions for a channel switching request include either the received light intensity of the current second channel being less than a preset light intensity threshold for a first preset time or the bit error rate of the current second channel being greater than a preset bit error rate threshold for a second time.

[0155] In some implementations, the channel switching request sent by the user terminal is received directly.

[0156] In some implementations, receiving updated communication service priority information and / or target transmission rate information sent by the user terminal is considered as receiving a channel switching request sent by the user terminal.

[0157] In some implementations, step S300 includes steps S310 to S320.

[0158] Step S310: Determine the target second channel based on the channel switching request.

[0159] In some implementations, the target second channel is determined based on a channel switching request sent directly by the user terminal.

[0160] In some implementations, when the user terminal sends updated communication service priority information and / or updated target transmission rate information, the updated communication service priority is determined based on the updated communication service priority information and / or the updated target transmission rate is determined based on the updated target transmission rate information, and the target second channel is re-determined based on the updated communication service priority and / or the updated target transmission rate using the methods in steps S210 to S220.

[0161] Step S320: Determine the target rotation angle corresponding to the target second channel based on the identifier of the target second channel and the preset mapping relationship information between the second channel identifier and the rotation angle.

[0162] The content of step S320 can be referred to the content of step S230.

[0163] The full-duplex signal transmission device based on free-space optical communication provided in this application is suitable for wireless data transmission in medical magnetic resonance imaging (MRI) equipment. When medical MRI equipment is operating, the high-speed rotating coil needs to upload high-resolution image data at high speed and receive control signals. However, traditional slip rings fail in strong magnetic fields. Therefore, the full-duplex signal transmission device provided in this application can be used in medical MRI equipment to achieve high-speed full-duplex signal transmission in strong magnetic fields.

[0164] Optionally, the first and second devices are also equipped with light-transmitting covers for cleaning.

[0165] Optionally, the outer surface of the lens is coated with a nano-silica coating. The nano-silica coating is hydrophobic and oleophobic, which can reduce the adhesion of dirt.

[0166] Optionally, miniature ultrasonic transducers are also installed on the first and second devices. When communication is not in progress, the miniature ultrasonic transducers can be activated to remove dust adhering to the lens surface, avoiding lens wear caused by mechanical wiping.

[0167] With the development of wireless communication technology, the requirements for network capacity and real-time performance are becoming increasingly stringent. Free-space optical communication (FSO), a novel high-speed wireless technology, has become a key solution to meet future ultra-high-speed (e.g., terabits per second) transmission demands due to its vast spectrum bandwidth resources. However, in practical application deployments, the following technical challenges exist: how to achieve stable, efficient, and flexible high-precision beam pointing and tracking; how to achieve small-volume and lightweight specifications; and how to control costs.

[0168] To address the aforementioned issues, this application provides a full-duplex signal transmission device based on free-space optical communication. When the first and second devices rotate relative to each other, the light intensity received by the laser receivers on both devices remains constant, achieving high-speed full-duplex signal transmission under rotational conditions and supporting transmission rates such as 10Gbps and 25Gbps. Furthermore, the first and second devices of this application can be made to a size of only a few millimeters, resulting in a small size and light weight.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A full-duplex signal transmission device based on free-space optical communication, characterized in that, The full-duplex signal transmission device includes: a rotatable first device and a second device; the rotation axes of the first device and the second device coincide. Both the first device and the second device include a central lens and a peripheral lens group. The peripheral lens group includes multiple peripheral lenses. The center of the central lens and the geometric center of the peripheral lens group are both located on the rotation axis. The peripheral lens group is arranged in a circular array around the central lens. The first device includes a first laser emitter, and the second device includes a first laser receiver. The first laser emitter is configured to correspond to the central lens of the first device, and the first laser receiver is configured to correspond to the central lens of the second device. When the first device and / or the second device rotates around the rotation axis, the light signal emitted by the first laser emitter is always received by the first laser receiver, so that the light intensity received by the first laser receiver remains unchanged during rotation. The first device includes a number of second laser receivers equal to the number of peripheral lenses. The second device includes a second laser emitter. Each second laser receiver corresponds to a peripheral lens of the first device, and each second laser emitter corresponds to a peripheral lens of the second device. When the first device and / or the second device rotates about a rotation axis, the light signal emitted by the second laser emitter is received by a second laser receiver or at least two adjacent second laser receivers. The first optical path of the first laser receiver and the first laser emitter is separated from the second optical path of the second laser receiver and the second laser emitter; The central lens of the first device and the central lens of the second device correspond to a first channel, and the peripheral lens group of the first device and the peripheral lens group of the second device correspond to multiple second channels. The signal transmission and reception directions of the first channel and the second channel are different. The first device is connected to the first communication device, and the second device is connected to the second communication device, so that the first communication device and the second communication device can realize full-duplex signal transmission based on free space optical communication; The first communication device or the second communication device is used to acquire communication requirement parameters and channel parameters, wherein the communication requirement parameters include a target transmission rate and a communication service priority, and the channel parameters include the maximum transmission rate and identifier that each second channel can support; Based on the communication requirement parameters and the channel parameters, the rotation angles of the first device and the second device are determined and communication is performed; wherein, during the rotation process, when the difference between the detected actual rotation angle of the device and the target rotation angle is less than a preset difference, the second laser receiver corresponding to the target second channel is turned on, the currently turned-on second laser receiver continues to work, and the other second laser receivers are kept in the off state. During the rotation process, the first signal weight of the currently activated second laser receiver is gradually reduced based on the difference between the actual rotation angle and the target rotation angle, while the second signal weight of the second laser receiver corresponding to the target second channel is gradually increased, until the difference between the detected actual rotation angle and the target rotation angle is less than a preset angle error, at which point the second signal weight is 1 and the first signal weight is 0. The peripheral lenses in the peripheral lens group are all liquid crystal lenses. The liquid crystal lenses are used to fine-tune the beam direction of the optical signal. The first device and the second device also include an electronic control unit. The liquid crystal lens includes multiple variable refractive index annular regions. Each variable refractive index annular region is electrically connected to an electrode of an electronic control unit. The electronic control unit controls the voltage of all variable refractive index annular regions through the electrode array to control the refractive index distribution of the liquid crystal lens.

2. The full-duplex signal transmission device based on free-space optical communication according to claim 1, characterized in that, When all the peripheral lenses of the peripheral lens group in the first device and the second device are projected onto the plane where the central lens is located, the center of all the peripheral lenses is equidistant from the center of the central lens.

3. The full-duplex signal transmission device based on free-space optical communication according to claim 1, characterized in that, The number of peripheral lens groups is at least two groups, and the different groups of peripheral lens groups are distributed on the circumference of circles of different radii with the center of the central lens as the center.

4. The full-duplex signal transmission device based on free-space optical communication according to claim 1, characterized in that, The first device and / or the second device include a first reference surface and a second reference surface, the central lens is disposed on the first reference surface, and the peripheral lens group is disposed on the second reference surface.

5. The full-duplex signal transmission device based on free-space optical communication according to claim 4, characterized in that, The first reference plane is higher than the second reference plane, or the first reference plane is lower than the second reference plane; "Higher" means the reference plane is closer to another component, and "lower" means the reference plane is farther away from another component.

6. The full-duplex signal transmission device based on free-space optical communication according to claim 4, characterized in that, The number of central lenses is multiple, and the number of peripheral lens groups is at least two. One central lens and at least one peripheral lens group are disposed on a first reference plane, and one central lens and at least one peripheral lens group are disposed on a second reference plane.

7. The full-duplex signal transmission device based on free-space optical communication according to claim 1, characterized in that, The central lens and the peripheral lens group in the first device and / or the second device are disposed on the same plane.

8. The full-duplex signal transmission device based on free-space optical communication according to claim 1, characterized in that, The shape of the central lens and the peripheral lens can be any one of a circle, an ellipse, or a polygon.

9. The full-duplex signal transmission device based on free-space optical communication according to claim 1, characterized in that, The surface shape of the central lens and the peripheral lens can be any one of a standard spherical surface, an aspherical surface, a Fresnel surface, or a freeform surface.

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