Satellite-to-ground system based on seamless fusion transmission of multi-core fiber and free space optical communication

Abstract

This invention relates to the fields of satellite-to-ground communication and free-space optical communication technologies, and proposes a satellite-to-ground system based on seamless integration of multi-core optical fiber and free-space optical communication. The system includes a ground station and multiple satellite nodes. The ground station uses multi-core optical fiber as the internal concurrent channel backbone. Each fiber core is connected to a multi-channel optical transceiver front-end via a multi-core fan-out / fan-in coupling assembly, driving a multi-beam FSO optical terminal to form multiple spatially separated beams. Each FSO beam corresponds to one satellite node, enabling concurrent uplink from multiple satellites. The downlink process is reversed, with the ground station receiving FSO beams from multiple satellites in parallel and fan-into the multi-core optical fiber output. The proposed architecture ensures isolation of the multi-core concurrent channels through crosstalk suppression design and allows for optional configuration of reconfigurable optical interconnects to achieve channel-level reconfiguration, thereby reducing ground station cabling complexity and improving the integration and scalability of the multi-satellite concurrent link.

Description

Technical Field

[0001] This invention relates to the fields of satellite-to-ground communication and free-space optical communication technology, and more specifically, to a satellite-to-ground system based on seamless integration and transmission of multi-core optical fiber and free-space optical communication. Background Technology

[0002] With the development of low-Earth orbit satellite constellations, ground stations often need to establish optical links with multiple satellites simultaneously within the same visibility window to meet the demands of high throughput and concurrent access by multiple users. In existing satellite-to-ground optical communication systems, ground stations typically use single-channel or limited-channel optical terminals, or multiple single-core optical fibers / cables fed to multiple transmission channels for expansion. These methods generally have the following problems: 1. Increased cabling and interface quantity: The increase in the number of concurrent links will lead to a rapid increase in the number of single-core optical fibers, connectors, and transceiver modules inside the ground station, increasing the pressure on maintenance and reliability; 2. Insufficient system integration: The multi-channel FSO terminals and the ground internal transmission channels lack a standardized and unified bearer structure, making it difficult to form a modular and scalable architecture; 3. Inconvenient engineering expansion and reconstruction: When it is necessary to add satellite links or reconstruct the channel (e.g., channel failure, unavailable direction, temporary expansion), the replacement and modification costs of traditional multi-single-core fiber solutions are high. 4. Difficulty in managing concurrent channel isolation and consistency: When multiple links run in parallel, the port correspondence is complex, making it difficult to maintain clear and stable channel mapping and isolation management in engineering.

[0003] Therefore, a satellite-to-ground hardware architecture for multi-satellite concurrency is needed, enabling ground stations to build multiple parallel optical links with higher integration and lower wiring complexity, while ensuring concurrent channel isolation and scalability. Summary of the Invention

[0004] In view of this, the present invention proposes a space-to-ground system based on seamless integration and transmission of multi-core optical fiber and free space optical communication. Without limiting the specific communication protocol, modulation method, coding method and network algorithm, it realizes that: the ground station uses a single multi-core optical fiber to complete the spatial multiplexing of multiple concurrent data transmission.

[0005] To achieve the above objectives, this invention proposes a space-to-ground system based on seamless integration of multi-core optical fiber and free-space optical communication, comprising: The ground station includes a multi-channel data interface unit, a multi-core fiber optic feeder, a multi-core fan-out / fan-in coupling assembly, a multi-channel optical transceiver front-end assembly, a multi-beam FSO optical terminal assembly, and a channel correspondence and control assembly. Multiple satellite nodes, each including a satellite FSO terminal, are used to establish free-space optical communication links with ground stations; The multi-channel data interface unit is used to access multiple sets of uplink and downlink data; The multi-core fiber feeder serves as the backbone of the concurrent channel within the ground station, containing multiple fiber core channels for spatial multiplexing of multiple data streams. The multi-core fan-out / fan-in coupling assembly is used to fan out each fiber channel of the multi-core fiber feeder into multiple independent optical ports, and fan in the multiple independent optical ports back into the corresponding fiber channel of the multi-core fiber feeder. The multi-channel optical transceiver front-end assembly is connected to the multi-core fan-out / fan-in coupling assembly, providing an optical front-end interface for transmission and / or reception for each channel; The multi-beam FSO optical terminal assembly has at least two FSO beam channels for forming multiple spatially separated FSO beams and establishing optical links with multiple satellite nodes, wherein each FSO beam channel corresponds to one satellite node. The channel correspondence and control component is used to establish and maintain the correspondence between fiber core channel, fan-out port, optical transceiver front-end channel, FSO beam channel, and satellite node, and to independently control the pointing, acquisition, and tracking of each FSO beam channel; In the uplink, multiple data streams from the ground station are transmitted in parallel through different fiber core channels of the multi-core fiber feeder. After being fanned out by the multi-core fan-out / fan-in coupling component, they enter the multi-channel optical transceiver front-end component and then enter the multi-beam FSO optical terminal component to form multiple spatially separated beams. Each beam is aligned with a satellite node, enabling concurrent uplink from multiple satellites. In the downlink, multiple downlink FSO beams from different satellite nodes are received in parallel by the multi-beam FSO optical terminal assembly, fan-in through the multi-channel optical transceiver front-end assembly and the multi-core fan-out / fan-in coupling assembly, and then output to the multi-core optical fiber feeder before being output to the multi-channel data interface unit.

[0006] Furthermore, the number N of concurrent working beam channels of the multi-beam FSO optical terminal assembly satisfies 2≤N≤37, and each working beam channel occupies at least one fiber core channel in the multi-core fiber feeder.

[0007] Furthermore, the multi-core fiber feeder and / or the multi-core fan-out / fan-in coupling assembly adopts a crosstalk suppression design to make the inter-core crosstalk lower than a preset threshold. The crosstalk suppression design includes any one or a combination of trench-assisted cladding structure, heterogeneous fiber core structure, and preset fiber core spacing and refractive index distribution structure; the crosstalk suppression design also includes the laying bending constraint of the multi-core fiber feeder and / or the encapsulation and isolation structure of the multi-core fan-out / fan-in coupling component.

[0008] Furthermore, the multi-core fan-out / fan-in coupling assembly includes any one or a combination of the following: a) Fan-out pigtail assembly of multi-core optical fiber and multiple single-core optical fiber; b) Integrating waveguide fan-out components to map multi-core inputs to waveguide array outputs; c) Fan-out / fan-in components based on photonic lanterns or mode-conversion structures; d) Array microlens coupling and precision alignment packaging components.

[0009] Furthermore, the multi-beam FSO optical terminal assembly is an arrayed terminal structure, including multiple collimating or telescope sub-terminals arranged in parallel, each sub-terminal forming an FSO beam channel and corresponding to a satellite node; Each FSO beam channel is equipped with an independent or semi-independent pointing mechanism, which includes any one or a combination of a two-dimensional turntable, a fast rotating mirror (FSM), and an optical phased array (OPA) to enable the beam channel to point to, acquire, and track the corresponding satellite node.

[0010] Furthermore, a reconfigurable optical interconnect component is provided between the multi-core fan-out / fan-in coupling component and the multi-beam FSO optical terminal component to enable selective connection between different fiber core channels and different FSO beam channels; The reconfigurable optical interconnect component is any one or a combination of MEMS optical switch matrix, integrated optical switch matrix, or modular optical wiring interconnect unit.

[0011] Furthermore, at least one fiber core channel in the multi-core fiber feeder and / or at least one beam channel in the multi-beam FSO optical terminal assembly are configured as backup redundant channels for hardware-level switching in the event of channel failure or link unavailability.

[0012] Furthermore, the multiple sets of data accessed by the multi-channel data interface unit are not limited to specific protocols and formats; the multi-channel optical transceiver front-end component is not limited to adopting a coherent or incoherent system.

[0013] On the other hand, to achieve the above objectives, this invention proposes a satellite-to-ground communication method based on seamless integration of multi-core optical fiber and free-space optical communication. The system described above includes the following steps: a) Load the multiple data streams from the ground station into different fiber core channels of the multi-core fiber feeder for parallel transmission; b) Connect each fiber core channel to the corresponding multi-beam FSO beam channel through a multi-core fan-out / fan-in coupling assembly, so that each FSO beam channel points to a satellite node and completes uplink transmission; c) It receives downlink FSO beams from multiple satellite nodes in parallel and couples them into the corresponding fiber core channels of the multi-core fiber feeder through multi-core fan-out / fan-in coupling components.

[0014] Furthermore, in step a), by adopting a multi-core fiber structure with trench assistance or heterogeneous cores and / or designing an isolation between the multi-core fiber laying and fan-out encapsulation, the inter-core crosstalk is kept below a preset threshold. In step b), selective connection between the fiber core channel and the beam channel is achieved through reconfigurable optical interconnect components, thereby realizing channel-level reconfiguration.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Significantly simplified cabling: Using a single multi-core fiber as the backbone of the concurrent channel inside the ground station replaces multiple single-core fibers in parallel cabling, reducing volume, weight and maintenance costs; Strong multi-satellite concurrent capability: Multi-beam FSO channels work in parallel, and "one beam, one satellite", which facilitates independent control and engineering deployment of satellites in multiple directions. Clear and manageable channel mapping: Establishes a one-to-one correspondence between "fiber core - port - transceiver front end - beam - satellite", reducing port mixing and maintenance complexity; Reliable channel isolation: Crosstalk suppression is achieved through multi-core structure selection and encapsulation isolation, improving the stability of parallel channels; Convenient expansion and reconfiguration: Optional reconfigurable optical interconnects enable channel-level reconfiguration at the hardware layer, enhancing system scalability and engineering adaptability. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. In the drawings: Figure 1 This is a schematic diagram of the overall architecture of the space-to-ground system based on the seamless integration of multi-core optical fiber and free-space optical communication according to the present invention. Detailed Implementation

[0017] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] This embodiment provides a space-to-ground hardware system architecture that, without limiting specific communication protocols, modulation methods, encoding methods, and network algorithms, enables the following: the ground station uses a single multi-core optical fiber to complete the spatial multiplexing of multiple concurrent data transmission and feeding. The ground-to-air interface uses a multi-beam FSO parallel link to communicate with multiple satellites, and satisfies the requirement of one beam corresponding to one satellite; it achieves low-loss connection of "multi-core-multi-channel-multi-beam" through fan-out / fan-in coupling mechanism; it ensures isolation of multi-core parallel channels through crosstalk suppression structure and encapsulation constraints; and it can optionally introduce reconfigurable optical interconnects to achieve channel-level reconfiguration, thereby achieving "seamless integration" and engineering expansion of multi-core optical fiber and multi-FSO links.

[0019] To achieve the above objectives, this embodiment provides a fixed-mapping satellite-to-ground architecture. For example... Figure 1 As shown, the ground station includes a multi-channel data interface unit 1, a multi-core fiber feeder 2, a multi-core fan-out / fan-in coupling component 3, a multi-channel optical transceiver front-end component 4, a multi-beam FSO optical terminal component 5, and a channel correspondence and control component 6; the satellite node consists of multiple satellite FSO terminals 7.

[0020] Concurrent load balancing within the ground station: The multi-channel data interface unit 1 sends multiple sets of data into their respective optical channels; each optical channel occupies a different fiber core channel in the multi-core fiber feeder 2, achieving parallel transmission. Because a single multi-core fiber is used as the backbone feeder, the number of optical cables inside the ground station can be significantly reduced.

[0021] The multi-core fan-out / fan-in coupling component 3 converts multiple fiber core channels into multiple independent optical ports (such as single-core pigtail ports or integrated waveguide ports), and connects them one by one to the multiple channels of the multi-channel optical transceiver front-end component 4; the receiving direction is fan-in to the corresponding fiber core in the opposite direction.

[0022] Multi-beam FSO concurrency and one beam per satellite: Each channel of the multi-channel optical transceiver front-end assembly 4 is connected to each beam channel of the multi-beam FSO optical terminal assembly 5. Each beam channel is aligned with a satellite node 7, thereby enabling concurrent communication between multiple satellites. In this structure, the beam channels are independent of each other, facilitating separate pointing, acquisition, and tracking.

[0023] Upward and downward directions: Uplink: Data flows from multi-channel data interface unit 1 → multi-core fiber feeder 2 → fan-out 3 → transceiver front end 4 → multi-beam FSO optical terminal 5 → corresponding satellite node 7; Downlink: Data flows from satellite node 7 → multi-beam FSO optical terminal 5 → transceiver front end 4 → fan-in 3 → multi-core fiber feeder 2 → multi-channel data interface unit 1.

[0024] The technical solution of this embodiment will be described in detail below: A space-to-ground architecture based on seamless integration and transmission of multi-core optical fiber and multiple free-space optical communications includes a ground station and multiple satellite nodes; the ground station includes: A multi-channel data interface unit is used to access multiple sets of uplink and downlink data; the present invention does not limit the protocol and format of the data. Multi-core fiber optic feeders serve as the backbone of concurrent channels within the ground station, used for spatial multiplexing of multiple data streams. A multi-core fan-out / fan-in coupling assembly is used to fan out each core of the multi-core optical fiber into multiple independent optical ports, and to fan the multiple independent optical ports back into the multi-core optical fiber. A multi-channel optical transceiver front-end assembly is connected to the fan-out / fan-in coupling assembly, providing an optical front-end interface for transmission and / or reception for each channel; the present invention does not limit its use to coherent or incoherent systems; A multi-beam FSO optical terminal assembly has at least two or more FSO beam channels for forming multiple spatially separated FSO beams and establishing optical links with multiple satellite nodes, wherein each FSO beam channel corresponds to one satellite node. The channel mapping and control component is used to establish and maintain the mapping relationship between "fiber core channel - fan-out port - optical transceiver front-end channel - FSO beam channel - satellite node", and to independently control the pointing, acquisition and tracking (PAT) of each FSO beam channel.

[0025] The satellite node includes a satellite FSO terminal, which is used to establish uplink and downlink optical links with the FSO beam channel corresponding to the ground station.

[0026] in: Uplink: Multiple data streams from the ground station are transmitted in parallel through different cores of a multi-core optical fiber. After being fanned out, they enter the multi-channel optical transceiver front end and then enter the multi-beam FSO optical terminal to form multiple spatially separated beams. Each beam is aligned with a satellite node, enabling concurrent uplink from multiple satellites. Downlink: Multiple downlink FSO beams from different satellite nodes are received in parallel by the ground station's multi-beam FSO optical terminal, and after being coupled to the multi-channel optical transceiver front end and fan-in, they enter the multi-core optical fiber and are then output to the multi-channel data interface unit.

[0027] To ensure the engineering availability of multi-core concurrent transmission, the multi-core fiber feeder and / or the fan-out / fan-in coupling assembly adopt a crosstalk suppression design to keep the inter-core crosstalk below a preset threshold. The crosstalk suppression design includes, but is not limited to, any one or a combination of the following: trench-assisted cladding structure, heterogeneous fiber core structure, preset fiber core spacing and refractive index distribution, fan-out / fan-in encapsulation isolation structure, and laying bending constraints.

[0028] The "seamless fusion transmission" referred to in this invention means at least that: through the above-mentioned channelized bearer structure, the ground station can complete the expansion, replacement and channel-level reconstruction of multi-beam FSO channels in a modular manner without changing the multi-core backbone feeder; optionally, selective connection between fiber core channels and beam channels can be realized through reconfigurable optical interconnect components, thereby achieving seamless fusion and rapid reconstruction at the hardware level.

[0029] In a preferred embodiment, the number N of concurrent working beam channels of the multi-beam FSO optical terminal assembly is within a reasonable range; for example, 2≤N≤37, and each working beam channel occupies at least one fiber core channel in the multi-core fiber feeder.

[0030] In a preferred embodiment, the multi-core fiber feeder and / or the multi-core fan-out / fan-in coupling assembly employs a crosstalk suppression design to reduce inter-core crosstalk to a preset threshold.

[0031] As a preferred embodiment, the crosstalk suppression design includes any one or a combination of trench-assisted cladding structure and / or heterogeneous core structure and / or preset core spacing and refractive index distribution structure.

[0032] In a preferred embodiment, the multi-core fan-out / fan-in coupling assembly includes any one or a combination of the following: a) Fan-out pigtail assembly of multi-core optical fiber and multi-single-core optical fiber; b) Integrating waveguide fan-out components to map multi-core inputs to waveguide array outputs; c) Fan-out / fan-in components based on photonic lanterns or mode-conversion structures; d) Array microlens coupling and precision alignment packaging components.

[0033] In a preferred embodiment, the multi-beam FSO optical terminal assembly is an arrayed terminal structure, including multiple collimating or telescope sub-terminals arranged in parallel, each sub-terminal forming an FSO beam channel and corresponding to a satellite node.

[0034] In a preferred embodiment, each FSO beam channel is configured with an independent or semi-independent pointing mechanism, which includes any one or a combination of a two-dimensional turntable, a fast rotating mirror (FSM), and an optical phased array (OPA) to enable the beam channel to point to, acquire, and track the corresponding satellite node.

[0035] In a preferred embodiment, a reconfigurable optical interconnect component is provided between the multi-core fan-out / fan-in coupling component and the multi-beam FSO optical terminal component to enable selective connection between different fiber core channels and different FSO beam channels.

[0036] In a preferred embodiment, the reconfigurable optical interconnect component is any one or a combination of a MEMS optical switch matrix, an integrated optical switch matrix, or a modular optical wiring interconnect unit.

[0037] In a preferred embodiment, at least one fiber core channel in the multi-core fiber feeder and / or at least one beam channel in the multi-beam FSO optical terminal assembly are configured as backup redundant channels for hardware-level switching in the event of channel failure or link unavailability.

[0038] For the above system, this embodiment proposes a satellite-to-ground communication method, the steps of which include: a) Load the multiple data streams from the ground station into different fiber core channels of a multi-core optical fiber for parallel transmission; b) Connect each fiber core channel to the corresponding multi-beam FSO beam channel through a multi-core fan-out coupling assembly, so that each FSO beam channel points to a satellite node and completes uplink transmission; c) The downlink FSO beams from multiple satellite nodes are received in parallel and coupled into the corresponding fiber core channels of the multi-core optical fiber through the multi-core fan-in coupling assembly.

[0039] As a preferred embodiment, in step a above, by adopting a multi-core fiber structure with trench assistance or heterogeneous fiber cores and / or designing an isolation between the multi-core fiber laying and fan-out packaging, the inter-core crosstalk is maintained below a preset threshold.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A space-to-ground system based on seamless integration of multi-core optical fiber and free-space optical communication, characterized in that, include: The ground station includes a multi-channel data interface unit (1), a multi-core fiber feeder (2), a multi-core fan-out / fan-in coupling assembly (3), a multi-channel optical transceiver front-end assembly (4), a multi-beam FSO optical terminal assembly (5), and a channel correspondence and control assembly (6). Multiple satellite nodes, each including a satellite FSO terminal (7), for establishing a free-space optical communication link with the ground station; The multi-channel data interface unit (1) is used to access multiple sets of uplink and downlink data; The multi-core fiber feeder (2) serves as the backbone of the internal concurrent channel of the ground station, containing multiple fiber core channels for spatial multiplexing of multiple data streams. The multi-core fan-out / fan-in coupling component (3) is used to fan out each fiber core channel of the multi-core fiber feeder (2) into multiple independent optical ports, and fan in the multiple independent optical ports back into the corresponding fiber core channel of the multi-core fiber feeder (2). The multi-channel optical transceiver front-end assembly (4) is connected to the multi-core fan-out / fan-in coupling assembly (3) to provide an optical front-end interface for transmission and / or reception for each channel; The multi-beam FSO optical terminal assembly (5) has at least two FSO beam channels for forming multiple spatially separated FSO beams and establishing optical links with multiple satellite nodes, wherein each FSO beam channel corresponds to one satellite node. The channel correspondence and control component (6) is used to establish and maintain the correspondence between fiber core channel, fan-out port, optical transceiver front-end channel, FSO beam channel, and satellite node, and to independently control the pointing, acquisition, and tracking of each FSO beam channel; In the uplink, multiple data streams from the ground station are transmitted in parallel through different fiber core channels of the multi-core fiber feeder (2), and after being fanned out by the multi-core fan-out / fan-in coupling component (3), they enter the multi-channel optical transceiver front-end component (4) and then enter the multi-beam FSO optical terminal component (5) to form multiple spatially separated beams, and each beam is aligned with a satellite node to achieve multi-satellite concurrent uplink; In the downlink, multiple downlink FSO beams from different satellite nodes are received in parallel by the multi-beam FSO optical terminal assembly (5), fan-in through the multi-channel optical transceiver front-end assembly (4) and the multi-core fan-out / fan-in coupling assembly (3), and then output to the multi-core optical fiber feeder (2) and then output to the multi-channel data interface unit (1).

2. The system according to claim 1, characterized in that, The number of concurrent working beam channels N of the multi-beam FSO optical terminal assembly (5) satisfies 2≤N≤37, and each working beam channel occupies at least one fiber core channel in the multi-core fiber feeder (2).

3. The system according to claim 1, characterized in that, The multi-core fiber feeder (2) and / or the multi-core fan-out / fan-in coupling assembly (3) adopt crosstalk suppression design to make the inter-core crosstalk lower than a preset threshold. The crosstalk suppression design includes any one or a combination of trench-assisted cladding structure, heterogeneous fiber core structure, and preset fiber core spacing and refractive index distribution structure; the crosstalk suppression design also includes the laying bending constraint of the multi-core fiber feeder (2) and / or the encapsulation isolation structure of the multi-core fan-out / fan-in coupling component (3).

4. The system according to claim 1, characterized in that, The multi-core fan-out / fan-in coupling assembly (3) includes any one or a combination of the following: a) Fan-out pigtail assembly of multi-core optical fiber and multi-single-core optical fiber; b) Integrating waveguide fan-out components to map multi-core inputs to waveguide array outputs; c) Fan-out / fan-in components based on photonic lanterns or mode-conversion structures; d) Array microlens coupling and precision alignment packaging components.

5. The system according to claim 1, characterized in that, The multi-beam FSO optical terminal assembly (5) is an arrayed terminal structure, including multiple collimating or telescope sub-terminals arranged in parallel. Each sub-terminal forms an FSO beam channel and corresponds to a satellite node. Each FSO beam channel is equipped with an independent or semi-independent pointing mechanism, which includes any one or a combination of a two-dimensional turntable, a fast rotating mirror (FSM), and an optical phased array (OPA) to enable the beam channel to point to, acquire, and track the corresponding satellite node.

6. The system according to claim 1, characterized in that, A reconfigurable optical interconnect component is provided between the multi-core fan-out / fan-in coupling component (3) and the multi-beam FSO optical terminal component (5) to enable selective connection between different fiber core channels and different FSO beam channels; The reconfigurable optical interconnect component is any one or a combination of MEMS optical switch matrix, integrated optical switch matrix, or modular optical wiring interconnect unit.

7. The system according to claim 1, characterized in that, At least one fiber core channel in the multi-core fiber feeder (2) and / or at least one beam channel in the multi-beam FSO optical terminal assembly (5) are configured as backup redundant channels for hardware-level switching in the event of channel failure or link unavailability.

8. The system according to claim 1, characterized in that, The multiple sets of data accessed by the multi-channel data interface unit (1) are not limited to specific protocols and formats; the multi-channel optical transceiver front-end component (4) is not limited to adopting a coherent or incoherent system.

9. A satellite-to-ground communication method based on seamless integration of multi-core optical fiber and free-space optical communication, employing the system described in any one of claims 1-8, characterized in that... Includes the following steps: a) Load the multiple data streams from the ground station into different fiber core channels of the multi-core fiber feeder (2) for parallel transmission; b) Connect each fiber core channel to the corresponding multi-beam FSO beam channel through the multi-core fan-out / fan-in coupling assembly (3), so that each FSO beam channel points to a satellite node and completes uplink transmission; c) The downlink FSO beams from multiple satellite nodes are received in parallel and coupled into the corresponding fiber core channels of the multi-core fiber feeder (2) through the multi-core fan-out / fan-in coupling assembly (3).

10. The method according to claim 9, characterized in that, In step a), by adopting a multi-core fiber structure with trench assistance or heterogeneous fiber cores and / or designing an isolation between multi-core fiber laying and fan-out packaging, the crosstalk between cores is kept below a preset threshold. In step b), selective connection between the fiber core channel and the beam channel is achieved through reconfigurable optical interconnect components, thereby realizing channel-level reconfiguration.

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