Optical antenna and communication terminal

Abstract

An optical antenna (300; 400; 71) and a communication terminal (70'). The optical antenna (300; 400; 71) comprises a first light source assembly (10) and an optical element (20); the first light source assembly (10) is used for emitting a first light beam towards the optical element (20); the optical element (20) comprises a reflection region used for reflecting the first light beam; the reflection region covers a central region of a first light spot formed by the first light beam on the optical element (20); the optical element (20) further comprises a transmission region used for transmitting a second light beam; and the second light beam is an external light beam. Alternatively, the optical antenna (300; 400; 71) further comprises a second light source assembly (40); the second light beam is a light beam emitted by the second light source assembly (40) towards the optical element (20); the energy distribution of the second light beam is different from that of the first light beam; the transmission region covers a central region of a second light spot formed by the second light beam on the optical element (20); and the optical element (20) is used for combining the first light beam and the second light beam by means of the reflection region and the transmission region. In this way, two light beams are combined by means of energy distribution, and light beam processing can be implemented without depending on the wavelength or polarization characteristics of a light source itself.

Description

Optical antenna and communication terminal

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 202411052609.3, filed on August 01, 2024, entitled “Optical antenna and communication terminal”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of optical communication technology, and in particular, to an optical antenna and a communication terminal. BACKGROUND

[0004] In optical communication, a broadband beam splitter (a commonly used non-polarized beam splitter that splits light according to energy proportion) or a polarized beam splitter is usually used for beam combining, wherein the broadband beam splitter mainly combines beams by means of the wavelength characteristics of the light source itself, and the polarized beam splitter mainly combines beams by means of the polarization characteristics of the light source itself. SUMMARY

[0005] Embodiments of the present application provide an optical antenna and a communication terminal to provide an optical antenna that does not rely on the wavelength or polarization characteristics of the light source itself for beam combining.

[0006] In a first aspect, embodiments of the present application provide an optical antenna, comprising a first light source assembly and an optical element, wherein:

[0007] The first light source assembly is configured to emit a first light beam towards the optical element;

[0008] The optical element comprises a reflection region configured to reflect the first light beam, the reflection region covering a central region of a first light spot formed by the first light beam on the optical element;

[0009] The optical element further comprises a transmission region configured to transmit a second light beam, the second light beam being an external light beam received by the optical antenna, or the optical antenna further comprising a second light source assembly configured to emit a second light beam towards the optical element; the energy distribution of the second light beam is different from that of the first light beam; the transmission region covers a central region of a second light spot formed by the second light beam on the optical element;

[0010] The optical element is configured to combine the first light beam and the second light beam through the reflection region and the transmission region.

[0011] In some embodiments, the reflection region is further configured to reflect an external light beam received by the optical antenna;

[0012] The optical element is also configured to split the external light beam received by the optical antenna through the reflecting region and the transmitting region.

[0013] In some embodiments, the reflecting region is coated with a reflecting film towards a side surface of the first light source assembly.

[0014] When the second light beam is an external light beam received by the optical antenna, the transmitting region is coated with a transmitting film towards a side surface of the second light source assembly; when the second light beam is a light beam emitted by the second light source assembly, opposite side surfaces of the transmitting region are coated with a transmitting film.

[0015] In some embodiments, the reflecting region is a mirror and the transmitting region is an anti-reflection lens.

[0016] In some embodiments, the reflecting region is coated with a reflecting film towards a side surface of the first light source assembly, or the reflecting region is a mirror.

[0017] The transmitting region is hollow.

[0018] In some embodiments, the reflecting region is coated with a reflecting film towards a side surface of the first light source assembly, the transmitting region is an anti-reflection lens, or

[0019] The reflecting region is a mirror, when the second light beam is an external light beam received by the optical antenna, the transmitting region is coated with a transmitting film towards a side surface of the second light source assembly; when the second light beam is a light beam emitted by the second light source assembly, opposite side surfaces of the transmitting region are coated with a transmitting film.

[0020] In some embodiments, the first light spot and the second light spot partially overlap, or the first light spot is inside the second light spot, or the second light spot is inside the first light spot.

[0021] In some embodiments, a difference between wavelengths of the first light beam and the second light beam is less than a preset value.

[0022] In some embodiments, a difference between polarization characteristics of the first light beam and the second light beam is less than a preset requirement.

[0023] In a second aspect, the embodiments of the present application provide a communication terminal, comprising the optical antenna as described above.

[0024] In the embodiment of the present application, the optical antenna comprises a first light source assembly and an optical element, wherein the first light source assembly is configured to emit a first light beam towards the optical element; the optical element comprises a reflection region configured to reflect the first light beam, the reflection region covering a central region of a first light spot formed by the first light beam on the optical element; the optical element further comprises a transmission region configured to transmit a second light beam, the second light beam being an external light beam received by the optical antenna, or the optical antenna further comprises a second light source assembly, the second light beam being a light beam emitted by the second light source assembly towards the optical element, the transmission region covering a central region of a second light spot formed by the second light beam on the optical element, and the optical element is configured to combine the first light beam and the second light beam through the reflection region and the transmission region. Since the energy distributions of the first light beam and the second light beam are different, when the first light beam and the second light beam are projected onto the optical element, the central region of the first light spot formed by the first light beam and the central region of the second light spot formed by the second light beam do not completely overlap. Therefore, the reflection region covering the central region of the first light spot (i.e., the energy concentration region of the first light beam) and the transmission region covering the central region of the second light spot (i.e., the energy concentration region of the second light beam) can be arranged on the optical element, the first light beam is reflected by the reflection region and the second light beam is transmitted by the transmission region, so that the first light beam and the second light beam are combined by means of the energy distribution, without relying on the wavelength or polarization characteristics of the light source itself for beam processing. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0026] FIG. 1 is a schematic diagram of an optical antenna in the related art;

[0027] FIG. 2 is a schematic diagram of another optical antenna in the related art;

[0028] FIG. 3 is a schematic diagram of an optical antenna provided by an embodiment of the present application;

[0029] FIG. 4 is a schematic diagram of a first light spot and a second light spot provided by an embodiment of the present application;

[0030] FIG. 5 is a schematic diagram of another optical antenna provided by an embodiment of the present application;

[0031] FIG. 6 is a schematic diagram of another first light spot and a second light spot provided by an embodiment of the present application;

[0032] FIG. 7 is a schematic diagram of a structure of a communication terminal provided by an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to provide an optical antenna that does not rely on the wavelength or polarization characteristics of the light source itself for beam combining, an embodiment of the present application provides an optical antenna and a communication terminal.

[0034] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings of the specification, it should be understood that the preferred embodiments described here are only used to illustrate and explain the present application, and are not used to limit the present application, and the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In space laser communication, a broadband beam splitter (a commonly used non-polarization beam splitter that splits light by energy ratio) or a polarization beam splitter is usually used for beam combining. The broadband beam splitter mainly relies on the wavelength characteristics of the light source itself for beam combining, and the polarization beam splitter mainly relies on the polarization characteristics of the light source itself for beam combining. The two beam combining methods are introduced below.

[0036] Referring to FIG. 1, which is a working schematic diagram of an optical antenna 100 in the related art, including a first light emitting component 01, a second light emitting component 02, and a broadband beam splitter 03, wherein the first light emitting component 01 is used to emit a light beam 11, the second light emitting component 02 is used to emit a light beam 22, and the broadband beam splitter 03 is used to combine the light beams 11 and 22 into a light beam 33, and subsequently, the light beam 33 enters a light receiving component 04 of another optical antenna. However, the broadband beam splitter 03 combines beams by energy ratio, and considering the transmission and reception comprehensively, a half-transmission and half-reflection is the optimal ratio, so that only 50% of the energy of the light beam 11 is transmitted, and only 50% of the energy of the light beam 22 is reflected, resulting in a 50% energy loss. When splitting, the light path is reversed, and similarly, 50% of the energy of the light beam to be split is transmitted and 50% is reflected, also resulting in a 50% energy loss.

[0037] Referring to FIG. 2, which is a working schematic diagram of another optical antenna 200 in the related art, including a first light emitting component 01, a second light emitting component 02, a first polarization controller 05, a second polarization controller 06, and a polarization beam splitter 07, wherein the first light emitting component 01 is used to emit a light beam 11, the second light emitting component 02 is used to emit a light beam 22, the first polarization controller 05 is used to perform polarization processing on the light beam 11, the second polarization controller 06 is used to perform polarization processing on the light beam 22, and the polarization beam splitter 07 is used to combine the polarized light beams 11 and 22 into a light beam 33, and subsequently, the light beam 33 enters a light receiving component 04 of another antenna. However, the problem of the polarization beam splitter 07 is that the light beams need to be polarized before being combined by polarization, which not only limits the application scenario, but also increases the volume and complexity of the optical path. When splitting, the light path is reversed, and similarly, these problems exist.

[0038] To solve the above problems, in the embodiments of the present application, the energy distributions of the two light beams on the two light paths are made different by optical design, the central regions of the light spots formed by the two light beams on the optical element do not completely overlap, that is, the two light beams have different energy concentration regions on the optical element, and by means of the different energy concentration regions, the optical element transmits most of the energy of the light beam on one light path and reflects most of the energy of the light beam on the other light path, so that the light beams on the two light paths are efficiently combined or split without relying on polarization or wavelength characteristics.

[0039] Referring to FIG. 3, FIG. 3 is a working schematic diagram of an optical antenna 300 provided by an embodiment of the present application, which includes a first light source assembly 10, an optical element 20, and a beam expanding transceiver antenna 30, wherein:

[0040] The first light source assembly 10 is configured to emit a first light beam towards the optical element 20;

[0041] The optical element 20 includes a reflection region configured to reflect the first light beam, and the reflection region covers a central region of a first light spot formed by the first light beam on the optical element 20. The central region of the first light spot refers to a region within a preset distance range from the center of the first light spot. Generally, the energy of a light beam is concentrated in the central region of a light spot, so the central region of the first light spot is the energy concentration region of the first light beam.

[0042] The optical element 20 further includes a transmission region configured to transmit a second light beam. The second light beam is an external light beam received by the optical antenna. Generally, after external light irradiates on the beam expanding transceiver antenna 30 such as a 10 times beam expanding transceiver antenna, the external light is converged into a parallel light beam (i.e., the external light beam) by the beam expanding transceiver antenna 30 and is projected onto the optical element 20. The energy distribution of the second light beam is different from that of the first light beam. The transmission region covers a central region of a second light spot formed by the second light beam on the optical element 20. The central region of the second light spot refers to a region within a preset distance range from the center of the second light spot. Since the energy of a light beam is concentrated in the central region of a light spot, the central region of the second light spot is the energy concentration region of the second light beam.

[0043] The optical element 20 is configured to reflect the first light beam by the reflection region and transmit the second light beam by the transmission region, so as to combine the first light beam and the second light beam, that is, to adjust the optical axes of the first light beam and the second light beam to be consistent. Then, the first light beam is reflected and emitted outwards by the beam expanding transceiver antenna 30, and the second light beam is transmitted and enters a subsequent optoelectronic processing device.

[0044] In actual application, after the external light beam received by the optical antenna is projected onto the optical element 20, the external light beam is transmitted by the transmission region and reflected by the reflection region. Correspondingly, the optical element 20 is further configured to split the external light beam by the reflection region and the transmission region.

[0045] In some embodiments, the first light source assembly 10 can include a light emitting device and a collimating lens, the light emitting device can be a light emitting diode, the fast axis divergence angle and the slow axis divergence angle of which can be significantly different, and a first light beam with a spot shape close to a rectangle can be formed by a single aspheric collimating lens. Referring to FIG. 4, which is a schematic diagram of a first light spot and a second light spot according to an embodiment of the present application, the white area is the first light spot, the elliptical area is the second light spot, and the black circular hole in the middle is a background area.

[0046] In some embodiments, the reflection area can be the rectangular area shown in FIG. 4, and the transmission area can be the area after the elliptical area is removed from the rectangular area. In addition, in order to flexibly adjust the reflection efficiency, the reflection area can also be larger or smaller than the rectangular area, and in order to flexibly adjust the transmission efficiency, the transmission area can also be correspondingly reduced or enlarged.

[0047] According to experimental data comparison, the use of the optical element 20 in FIG. 3 can improve the link gain of the overall transceiver link by about 4.93 decibels (db) compared with the use of the broadband beam splitter 03.

[0048] Referring to FIG. 5, which is a working schematic diagram of another optical antenna 400 according to an embodiment of the present application, the optical antenna 400 includes a first light source assembly 10, an optical element 20, a beam expansion transceiver antenna 30, and a second light source assembly 40, wherein:

[0049] The first light source assembly 10 is configured to emit a first light beam toward the optical element 20, and the second light source assembly 40 is configured to emit a second light beam toward the optical element 20, the energy distribution of the second light beam being different from that of the first light beam;

[0050] The optical element 20 includes a reflection area configured to reflect the first light beam, the reflection area covering a central area of a first light spot formed by the first light beam on the optical element 20, i.e., the reflection area covering an energy concentration area of the first light beam;

[0051] The optical element 20 further includes a transmission area configured to transmit the second light beam, the transmission area covering a central area of a second light spot formed by the second light beam on the optical element 20, i.e., the transmission area covering an energy concentration area of the second light beam;

[0052] The optical element 20 is configured to combine the first light beam and the second light beam through the reflection area and the transmission area. Subsequently, the combined light beam can be emitted outward by the beam expansion transceiver antenna 30, such as a 10 times beam expansion transceiver antenna.

[0053] In practical applications, when the external light beam received by the optical antenna through the beam expansion transceiver antenna 30 is projected to the optical element 20, the external light beam will be both transmitted by the transmission area and reflected by the reflection area, accordingly, the optical element 20 is also used for splitting the external light beam received by the optical antenna through the reflection area and the transmission area.

[0054] In some embodiments, the first light source assembly 10 and the second light source assembly 40 can each include a light emitting device such as a Gaussian light source and a collimating lens, and the wavelengths of the two Gaussian light sources are the same and the focal lengths of the two collimating lenses are different. For example, the first light source assembly 10 emits a collimated light beam with a wavelength of 1550 nanometers (nm) and a diameter of 1 millimeter (mm), and the second light source assembly 40 emits a collimated light beam with a wavelength of 1550 nm and a diameter of 6 mm, at this time, the first light beam and the second light beam each form a circular spot. Referring to FIG. 6, which is a schematic diagram of a first light spot and a second light spot according to another embodiment of the present application, the lower black small circle area represents the first light spot formed by the first light beam, the white large circle area represents the second light spot formed by the second light beam, and the upper black small circle represents a background area.

[0055] In order to maximize the reflection of the first light beam and the transmission of the second light beam, the reflection area can be the area where the first light spot is located, that is, the lower black small circle area, and the transmission area can be the non-overlapping area of the second light spot and the first light spot, that is, the area of the white large circle excluding the lower black small circle. In addition, in order to flexibly adjust the reflection efficiency, the reflection area can also be a partial area of the first light spot, for example, the reflection area can be the central area of the lower black small circle, and in order to flexibly adjust the transmission efficiency, the transmission area can also be a partial non-overlapping area of the second light spot and the first light spot, and the transmission area can also be a non-overlapping area of the second light spot and the first light spot and a partial peripheral area of the lower black small circle.

[0056] According to the simulation data comparison, the emission efficiency can be improved by 5.433 db by using the optical element 20 in FIG. 5 than by using the broadband beam splitter 03.

[0057] In FIGS. 4 and 6, the first light spot is located inside the second light spot, in fact, the second light spot can also be located inside the first light spot, or the first light spot and the second light spot only partially overlap each other.

[0058] In addition, in practical applications, the form of the optical element 20 in FIGS. 3 and 5 can be various, and the form of the optical element 20 is exemplified as follows.

[0059] First, both the reflection area and the transmission area are coated.

[0060] For the reflection region, the side surface of the reflection region facing the first light source assembly 10 is coated with a reflective film, and the other side surface of the reflection region facing away from the first light source assembly 10 can be coated with a reflective film or not.

[0061] For the transmission region, when the second light beam is an external light beam (i.e., the case of FIG. 3), the side surface of the transmission region facing the second light source assembly 40 is coated with a transmission film; when the second light beam is a light beam emitted by the second light source assembly 40 (i.e., the case of FIG. 5), the opposite side surfaces of the transmission region are both coated with a transmission film.

[0062] The second, the reflection region and the transmission region are both provided with a mirror.

[0063] Specifically, the reflection region is a mirror, and the transmission region is an antireflection lens. Taking the case that the first light spot is contained in the second light spot as an example, at this time, an antireflection lens can be selected, and then a hole is punched at the position corresponding to the reflection region in the antireflection lens and a mirror is placed therein; taking the case that the second light spot is contained in the first light spot as an example, at this time, a mirror can be selected, and then a hole is punched at the position corresponding to the transmission region in the mirror and an antireflection lens is placed therein.

[0064] The third, the transmission region is hollow, and the reflection region is coated with a film or provided with a mirror.

[0065] Considering that air also has a transmission effect, in some embodiments, the transmission region can be hollow. Moreover, when the reflection region is coated with a film, the side surface of the reflection region facing the first light source assembly 10 is coated with a reflective film.

[0066] The fourth, one of the reflection region and the transmission region is provided with a mirror, and the other is coated with a film.

[0067] Case 1, the reflection region is coated with a film, and the transmission region is provided with a mirror.

[0068] The side surface of the reflection region facing the first light source assembly 10 is coated with a reflective film, and the transmission region is an antireflection lens.

[0069] Case 2, the reflection region is provided with a mirror, and the transmission region is coated with a film.

[0070] The reflection region is a mirror, and for the transmission region, when the second light beam is an external light beam, the side surface of the transmission region facing the second light source assembly 40 is coated with a transmission film; when the second light beam is a light beam emitted by the second light source assembly 40, the opposite side surfaces of the transmission region can both be coated with a transmission film.

[0071] The antireflection film refers to a film that has an antireflection effect, the reflection film refers to a film that has a reflection effect, the antireflection lens refers to an optical lens that has an antireflection effect, the mirror refers to an optical mirror that has a reflection effect, and the mirror can be replaced by a dichroic mirror because the dichroic mirror can also have a reflection effect. In addition, the transmittance of the antireflection film or the antireflection lens can be selected by the technician according to the actual requirement, and the reflectivity of the reflection film or the mirror can also be selected by the technician according to the actual requirement, which will not be described here.

[0072] In practical applications, the broadband beam splitter 03 in FIG. 1 can better process two light beams with different wavelengths, such as beam splitting or beam combining, but it is difficult to process two light beams with similar wavelengths (i.e., the difference between the wavelengths is less than a preset value). The optical antenna in the embodiment of the present application processes light beams by means of energy distribution of the light beams, so even if the wavelengths of the first light beam and the second light beam are similar, as long as the energy distributions of the first light beam and the second light beam are different, the first light beam and the second light beam can be better split or combined.

[0073] In addition, the polarization beam splitter 07 in FIG. 2 can better process two light beams with different polarization characteristics, such as beam splitting or beam combining, but it is difficult to process two light beams with similar polarization characteristics or no fixed polarization characteristics. The optical antenna in the embodiment of the present application processes light beams by means of energy distribution of the light beams, so even if the polarization characteristics of the first light beam and the second light beam are similar, as long as the energy distributions of the first light beam and the second light beam are different, the first light beam and the second light beam can be better split or combined.

[0074] The optical antenna in the embodiment of the present application can process the first light beam and the second light beam by means of energy distribution of the light beams, such as beam splitting or beam combining, without relying on the wavelength or polarization characteristics of the light beams for beam processing. In addition, the optical antenna reflects the first light beam in the reflection region where the energy of the first light beam is concentrated and transmits the second light beam in the transmission region where the energy of the second light beam is concentrated, which can more specifically transmit and reflect, and also helps to reduce the energy loss of the light beam after passing through the optical element. In addition, the optical antenna does not need to increase other components, so the application scenarios are more extensive and will not increase the volume and complexity of the optical path.

[0075] In practical applications, the spatial link requirement is generally determined first, and then the optical antenna is designed according to the spatial link requirement. The process of designing the optical antenna is a process of gradually optimizing the antenna parameters of the optical antenna, and finally obtaining the antenna parameters that meet various performance indicators. In the embodiment of the present application, the antenna parameters that need to be optimized, such as the energy distribution parameters of the first light source assembly 10, the energy distribution parameters of the second light source assembly 40, the position of the reflection region, the position of the transmission region, the reflectivity of the reflection region, the transmittance of the projection region, etc.

[0076] In practical applications, the general process of designing an optical antenna according to spatial link requirements is as follows:

[0077] According to the preset spatial link requirements, the initial antenna parameters are determined;

[0078] According to the antenna parameters, the working process of the optical antenna is simulated, i.e., the process of the optical antenna transmitting and receiving data under the set of antenna parameters is simulated;

[0079] According to the simulated performance characterization data, the index value of at least one performance index of the optical antenna is determined, wherein the at least one performance index is, for example, a transmission efficiency, a reception efficiency, etc.

[0080] If the index value of any performance index does not meet the index value requirement of the performance index, at least one of the antenna parameters is adjusted.

[0081] The step of simulating the working process of the optical antenna according to the antenna parameters is executed until the index values of various performance indexes respectively meet the index value requirements of the corresponding performance indexes, and the current antenna parameters are determined as the final antenna parameters. That is, when the index value of each performance index meets the index value requirement of the performance index, the optical antenna design can be ended.

[0082] Subsequently, the antenna can be manufactured according to the designed antenna parameters.

[0083] Based on the same inventive concept, the embodiment of the present application further provides a communication terminal 70', as shown in Fig. 7, which is a schematic diagram of the communication terminal 70' provided by the embodiment of the present application, and includes an optical antenna 71, a low-noise amplifier 72, a wave divider 73, a first wavelength conversion component 74, an optical amplifier 75, a combiner 76, and a second wavelength conversion component 77. The optical antenna 71 can adopt the structure of the optical antenna 300 or the optical antenna 400, and is used for receiving and transmitting optical signals. The low-noise amplifier 72 is used for amplifying the optical signals received by the optical antenna 71 and sending the optical signals to the wave divider 73. The wave divider 73 is used for filtering the received optical signals to form optical control messages and optical data messages, sending the optical control messages to a subsequent switching control unit for processing, and sending the optical data messages to the first wavelength conversion component 74. The first wavelength conversion component 74 is used for converting the wavelength of the optical data messages and sending the converted optical data messages to a subsequent optical switching unit for processing. The second wavelength conversion component 77 is used for converting the wavelength of the optical data messages to be transmitted sent by the optical switching unit, sending the converted optical data messages to the combiner 76. The combiner 76 is used for combining the optical control messages to be transmitted sent by the switching control unit and the optical data messages to be transmitted, forming optical signals to be transmitted, and sending the optical signals to be transmitted to the optical amplifier 75. The optical amplifier 75 is used for amplifying the optical signals to be transmitted and sending the optical signals to the optical antenna 71 for external transmission.

[0084] Although the preferred embodiments of the present application have been described, those skilled in the art who understand the inventive concept can make additional changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including all the changes and modifications falling within the scope of the present application.

[0085] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application embrace all such changes and modifications.

Claims

1. An optical antenna, characterized by The optical antenna comprises a first light source assembly and an optical element, wherein: the first light source assembly is configured to emit a first light beam towards the optical element; the optical element comprises a reflection region configured to reflect the first light beam, the reflection region covering a central region of a first light spot formed by the first light beam on the optical element; the optical element further comprises a transmission region configured to transmit a second light beam, the second light beam being an external light beam received by the optical antenna, or the optical antenna further comprises a second light source assembly configured to emit a second light beam towards the optical element; the second light beam and the first light beam have different energy distributions; the transmission region covers a central region of a second light spot formed by the second light beam on the optical element; the optical element is configured to combine the first light beam and the second light beam through the reflection region and the transmission region.

2. The optical antenna of claim 1, wherein, the reflection region is further configured to reflect an external light beam received by the optical antenna; the optical element is further configured to split the external light beam received by the optical antenna through the reflection region and the transmission region.

3. The optical antenna according to claim 1 or 2, wherein a side surface of the reflection region towards the first light source assembly is coated with a reflective film; when the second light beam is an external light beam received by the optical antenna, a side surface of the transmission region towards the second light source assembly is coated with a transmission film; when the second light beam is a light beam emitted by the second light source assembly, opposite side surfaces of the transmission region are coated with transmission films.

4. The optical antenna of claim 1 or 2, wherein the reflection region is a mirror, and the transmission region is an anti-reflection lens.

5. The optical antenna of claim 1 or 2, wherein a side surface of the reflection region towards the first light source assembly is coated with a reflective film, or the reflection region is a mirror; the transmission region is hollow.

6. The optical antenna of claim 1 or 2, wherein a side surface of the reflection region towards the first light source assembly is coated with a reflective film, and the transmission region is an anti-reflection lens, or the reflection region is a mirror, and when the second light beam is an external light beam received by the optical antenna, a side surface of the transmission region towards the second light source assembly is coated with a transmission film; when the second light beam is a light beam emitted by the second light source assembly, opposite side surfaces of the transmission region are coated with transmission films.

7. The optical antenna of claim 1, wherein, the first light spot and the second light spot partially overlap, or the first light spot is inside the second light spot, or the second light spot is inside the first light spot.

8. The optical antenna of claim 1, wherein, a difference between wavelengths of the first light beam and the second light beam is less than a preset value.

9. The optical antenna of claim 1, wherein, a difference between polarization characteristics of the first light beam and the second light beam is less than a preset requirement.

10. A communication terminal, characterized by The optical antenna comprises any one of claims 1 to 9.

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