Miniaturized and high-reliability multiplexing optical fiber rotation transmission system for space navigation

Abstract

The invention discloses a miniaturized and high-reliability multiplexing optical fiber rotation transmission system for space navigation. Comprising a main multi-path electro-optical conversion unit, a backup multi-path electro-optical conversion unit, a main and backup multi-path electro-optical conversion unit optical path cascade module, a main and backup multi-path electro-optical conversion unit circuit gating module, a main multi-path photoelectric conversion unit, a backup multi-path photoelectric conversion unit and a main and backup multi-path photoelectric conversion unit optical path cascade module, the system is designed according to the thoughts of a main-backup multi-path photoelectric conversion unit circuit gating module and an optical fiber rotary connector, and after the system is built, electro-optical / photoelectric conversion, optical wavelength division multiplexing, cascade redundant backup and optical rotary transmission can be carried out. The device is low in design complexity, high in integration level, multi-channel parallel, rotatable in transmission, low in power consumption and suitable for various communication scenes needing multi-channel high-speed rotation transmission.

Description

Technical Field

[0001] The present invention relates to a miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use, which can be applied to high-bandwidth data transmission scenarios of 360° rotation working conditions of payloads such as remote sensing satellite cameras, and belongs to the technical field of optical fiber transmission for aerospace use. Background Art

[0002] Fiber optic communication is widely used in the civilian industry, and the technology is relatively mature. The application scenarios are generally the construction and laying of civilian optical networks. They are buried in the seabed or underground, and the use state is relatively fixed, and the reliability requirements are relatively low. Fiber optic rotary transmission is a type of fiber optic communication, also known as fiber optic slip ring and fiber optic convergence ring. It is particularly suitable for applications that require unlimited, continuous or intermittent rotation, and at the same time need to transmit high-bandwidth data and signals from a fixed position to a rotating position. It can improve mechanical performance and simplify system operation. It is currently mainly used in the civilian market.

[0003] The multi-channel signal transmission process is generally as follows Figure 2 to Figure 4 Several options are shown:

[0004] Figure 2 The design scheme is completely independent for each signal transmission. The optical transceiver component has a simple structure, which is equivalent to an n-channel single-wavelength SFP (Small Form Pluggable) module. However, it has high requirements for the optical fiber rotary connector, which needs to include N pairs of optical fiber collimators and a complex lens system to realize the transmission of multiple optical signals.

[0005] Figure 3 This is a multiplexing scheme for multiple signal circuits. After each electrical signal is received by TLK2711, it passes through a specially designed parallel-to-serial circuit to obtain a composite signal. After the signal is loaded into the photoelectric modulation module, an optical signal is generated. After passing through the optical fiber rotary connector, the photoelectric detection module converts the optical signal into an electrical signal. The electrical signal is decomposed again through a specially designed serial-to-parallel circuit. The circuit design of this scheme is relatively difficult, and how to handle high-speed signals becomes the key.

[0006] Figure 4 It is a multi-channel signal optical path multiplexing solution. Each electrical signal is directly loaded into the electro-optical modulation module to obtain n light waves of different wavelengths, and single optical cable transmission is achieved through wavelength division multiplexing technology. The receiving component is completely the reverse process of the sending component, and the signal is decomposed through wavelength division multiplexing technology. This solution has low requirements for optical fiber rotary connectors, but wavelength division multiplexers and wavelength division multiplexers are the key to the wavelength division multiplexing optical transmission system solution.

[0007] Traditional fiber optic communication systems such as Figure 1As shown in the figure, when applied to high-bandwidth rotation transmission in aerospace, the difficulties faced include: (1) The camera raw data is usually transmitted using the TLK2711 protocol, using a high-speed differential interface, which is not an interface standard widely used in the civilian industry and requires special processing; (2) The transmission channel is multi-channel, and data transmission needs to be carried out synchronously and in parallel, which is not a single-channel design widely used in the civilian industry; (3) The image transmission rate under 360° high-speed rotation is not less than 2Gbps, which cannot be solved by using traditional electric slip rings; (4) When using optical transmission design for image transmission under 360° high-speed rotation, it is necessary to complete the multi-to-one aggregation of multiple signals; (5) Under the constraints of miniaturization and low power consumption, it is necessary to realize redundant backup of optical / electrical and electrical / optical functions; (6) In aerospace applications, it is necessary to consider the radiation resistance selection of devices and the radiation resistance reinforcement design of solutions. In view of the above difficulties or problems, there is currently no mature solution that can fully meet all the above requirements. Summary of the invention

[0008] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use, which has the characteristics of low complexity, high integration, multi-channel parallelism, rotatable transmission, low power consumption, etc., and is suitable for various communication scenarios requiring multi-channel high-speed rotation transmission.

[0009] The technical solution of the present invention is: a miniaturized, highly reliable multiplexed optical fiber rotary transmission system for aerospace, a main multiplexed electro-optical conversion unit, a backup multiplexed electro-optical conversion unit, a main backup multiplexed electro-optical conversion unit optical path cascade module, a main backup multiplexed electro-optical conversion unit selection module, a main multiplexed photoelectric conversion unit, a backup multiplexed photoelectric conversion unit, a main backup multiplexed photoelectric conversion unit optical path cascade module, a main backup multiplexed photoelectric conversion unit selection module, and an optical fiber rotary connector, wherein:

[0010] The main and backup multi-channel electro-optical conversion unit selection module receives the instruction of the upper control computer and sends a power-on and power-off control pulse signal to the main and backup multi-channel electro-optical conversion unit or the backup multi-channel electro-optical conversion unit to realize the main and backup switching;

[0011] The main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit have the same internal structure design, converting the electrical signal representing the valid data information into an optical signal, and sending the generated optical signal to the main and backup multi-channel electro-optical conversion unit optical path cascade module;

[0012] The main backup multi-channel electro-optical conversion unit optical path cascading module cascades the optical connectors of the main multi-channel electro-optical conversion unit or the backup multi-channel electro-optical conversion unit, and sends one optical path signal output after cascading to the optical fiber rotary connector;

[0013] The optical fiber rotary connector receives the optical path signal output by the optical path cascade module of the main backup multi-channel electro-optical conversion unit, and forwards it to the optical path cascade module of the main backup multi-channel photoelectric conversion unit, completing the continuous transmission of light in the high-speed rotation scene;

[0014] The optical path cascade module of the main and backup multi-channel photoelectric conversion units receives the optical signal sent by the optical fiber rotary connector and sends it to the main and backup multi-channel photoelectric conversion units or the backup multi-channel photoelectric conversion units;

[0015] The main and backup multi-channel photoelectric conversion unit selection module receives the instruction of the upper control computer and sends a power-on and power-off control pulse signal to the main and backup multi-channel photoelectric conversion unit or the backup multi-channel photoelectric conversion unit, thereby realizing the main and backup switching;

[0016] The main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit have the same internal structure design, and convert the optical signal output by the optical path cascade module of the main and backup multi-channel photoelectric conversion units into an electrical signal.

[0017] Preferably, the main multi-channel electro-optical conversion unit includes a multi-channel electro-optical modulation module, an optical power monitoring module, a power management module and a wavelength division multiplexer, specifically:

[0018] Each electro-optical modulation module in the multi-channel electro-optical modulation module adopts the transparent transmission mode and completes the electro-optical conversion in the OOK mode; the input of each electro-optical modulation module is a differential input signal that meets the TLK2711 protocol, and the output is a single-mode optical fiber interface; the single-mode optical fiber interface of each electro-optical modulation module is connected to the input optical interface of the wavelength division multiplexer, and the output optical interface of the wavelength division multiplexer is connected to the optical connector leading out to the outside;

[0019] The optical power monitoring module is connected to each electro-optical modulation module to complete the real-time acquisition of the laser output power during the electro-optical conversion process, and transmits the acquired laser output power information to the upper control computer for product health status monitoring;

[0020] The power management module is connected to each electro-optical modulation module and the optical power monitoring module, and provides a controlled and reliable secondary power supply for the multi-channel electro-optical modulation modules and the optical power monitoring modules under the control of the upper control computer.

[0021] Preferably, the primary multi-channel electro-optical conversion unit, the backup multi-channel electro-optical conversion unit, the primary multi-channel photoelectric conversion unit, and the backup multi-channel photoelectric conversion unit are designed in a cold backup mode.

[0022] Preferably, the main backup multi-channel electro-optical conversion unit gating module includes a decoding circuit and a driving circuit, wherein:

[0023] The decoding circuit receives the digital power-on and power-off instructions from the upper control computer and decodes them. Then, the driving circuit composed of pulse control devices generates power-on and power-off control pulse signals and sends them to the main multi-channel electro-optical conversion unit or the backup multi-channel electro-optical conversion unit.

[0024] Preferably, the main backup multi-channel optoelectronic conversion unit gating module includes a decoding circuit and a driving circuit, wherein:

[0025] The decoding circuit receives the digital power-on and power-off instructions from the upper control computer and decodes them. Then, the driving circuit composed of pulse control devices generates power-on and power-off control pulse signals and sends them to the main multi-channel photoelectric conversion unit or the backup multi-channel photoelectric conversion unit.

[0026] Preferably, the main-backup multi-channel electro-optical conversion unit optical path cascade module includes two couplers, the main optical connector interface of the main-backup multi-channel electro-optical conversion unit optical path cascade module is connected to the main optical connector interface of the multi-channel electro-optical conversion unit, and the backup optical interface of the main-backup multi-channel electro-optical conversion unit optical path cascade module is connected to the backup optical connector interface of the backup multi-channel electro-optical conversion unit; the main-backup multi-channel electro-optical conversion unit optical path cascade module transmits the optical signal to the optical fiber rotary connector through the cascaded optical connector.

[0027] Preferably, the main-backup multi-channel optoelectronic conversion unit optical path cascade module includes two couplers, the main optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module is connected to the main multi-channel optoelectronic conversion unit optical connector interface, and the backup optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module is connected to the backup multi-channel optoelectronic conversion unit optical connector interface; the main-backup multi-channel optoelectronic conversion unit cascade module receives the optical signal output from the optical fiber rotary connector, and then transmits the optical signal to the main multi-channel optoelectronic conversion unit or the backup multi-channel optoelectronic conversion unit.

[0028] Preferably, the optical fiber rotary connector adopts single-mode optical path spatial coupling alignment technology, and has an optical interface on each side, which is respectively connected to the output optical interface of the main and backup multi-channel electro-optical conversion unit optical path cascade module and the input optical interface of the main and backup multi-channel optoelectronic conversion unit optical path cascade module.

[0029] Preferably, the master multi-channel photoelectric conversion unit includes a multi-channel photoelectric detection module, an optical power monitoring module, a power management module and a wavelength division multiplexer, specifically:

[0030] Each photoelectric detection module uses a PIN detector to complete the photoelectric conversion in OOK mode; the input of each photoelectric detection module is a single-mode optical fiber interface, and the output of each photoelectric detection module is a differential signal that complies with the TLK2711 protocol. The single-mode optical fiber interface at the input end of each photoelectric detection module is connected to the output end of the demultiplexer, and the input end of the demultiplexer is led out to the external optical connector;

[0031] The optical power monitoring module is connected to each photoelectric detection module to complete the real-time acquisition of the detector output optical power during the photoelectric conversion process of each channel, which is used for product health status monitoring;

[0032] The power management module is connected to each photoelectric detection module and the optical power monitoring module, and provides a controlled and reliable secondary power supply for the multi-channel photoelectric detection modules and the optical power monitoring modules under the control of the upper control computer.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The multiplexed high-bandwidth optical fiber rotation transmission system of the present invention adopts transparent electro-optical conversion, optical wavelength division multiplexing, cascade redundant backup, optical rotation transmission and other technologies, which can simultaneously meet the following requirements: no special processing is required for the interface standard; there are multiple channels to be transmitted, and data transmission can be carried out synchronously and in parallel; the image transmission rate is not less than 2Gbps under 360° high-speed rotation; the optical transmission design is a multi-to-one aggregation of multiple signals; it has redundant backup of optical / electrical and electrical / optical functions; it has radiation-resistant selection of devices and radiation-resistant reinforcement design of solutions; it has the advantages of low complexity, high integration, multi-channel parallel, rotatable transmission, and low power consumption. The bearing assembly of the optical fiber rotation connector adopts a miniaturized design, and the primary and backup designs ensure the high reliability of the system; it is suitable for various communication scenarios requiring multi-channel high-speed rotation transmission, and has good effects in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a block diagram of a conventional optical fiber communication system;

[0036] Figure 2 It is a schematic diagram of the optical fiber rotation transmission system scheme 1;

[0037] Figure 3 It is a schematic diagram of the optical fiber rotation transmission system scheme 2;

[0038] Figure 4 It is a schematic diagram of scheme 3 of optical fiber rotation transmission system;

[0039] Figure 5 It is a schematic diagram of the overall scheme of the present invention;

[0040] Figure 6 This is a schematic diagram of the main multi-channel electro-optical conversion unit of the present invention;

[0041] Figure 7 This is a schematic diagram of a backup multi-channel electro-optical conversion unit of the present invention;

[0042] Figure 8 This is a schematic diagram of the main multi-channel photoelectric conversion unit of the present invention;

[0043] Fig. 9 This is a schematic diagram of a backup multi-channel photoelectric conversion unit of the present invention;

[0044] Fig.10 This is a schematic diagram of the cascaded module of the main and backup electro-optical conversion units of the present invention;

[0045] Fig.11 This is a schematic diagram of the cascaded module of the main and backup photoelectric conversion units of the present invention;

[0046] Fig.12 This is a schematic diagram of the gating module of the main backup electro-optical / photoelectric conversion unit circuit of the present invention;

[0047] Fig.13 It is a schematic diagram of the optical fiber rotary connector of the present invention;

[0048] Fig.14 A schematic diagram of a three-channel high-speed transmission system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, and to design a multiplexed high-bandwidth optical fiber rotation transmission system based on transparent electro-optical / photoelectric conversion, optical wavelength division multiplexing, cascaded redundant backup, optical rotation transmission and other technologies in view of the shortcomings of traditional civilian technology interface mismatch, insufficient redundant design, insufficient radiation resistance design and high circuit requirements of traditional technology.

[0050] By analyzing the above problems, the present invention designs a multiplexed high-bandwidth optical fiber rotary transmission system based on transparent electro-optical / photoelectric conversion, optical wavelength division multiplexing / de-wavelength division multiplexing, cascaded redundant backup, and optical rotation transmission technology. The scheme has the characteristics of low complexity, high integration, multi-channel parallel, rotatable transmission, and low power consumption. The bearing assembly of the optical fiber rotary connector adopts a miniaturized design, and the primary and backup design ensures the high reliability of the system. It is suitable for various communication scenarios requiring multi-channel high-speed rotation transmission, and the effect is good in practical applications.

[0051] In aerospace applications, the camera-based data source is generally a primary-backup design. This design uses the primary-backup high-speed data transmission channel according to the needs. Figure 4 The idea of ​​​​Scheme 3 is shown.

[0052] (1) Adopting the electro-optical transparent transmission conversion + n-wavelength wavelength division multiplexing solution, the conversion of n parallel electrical signals into one serial optical signal is completed, realizing the function of a single multi-channel electro-optical conversion unit;

[0053] (2) The main and backup multi-channel electro-optical conversion units are connected redundantly with each other through the optical path cascade module of the main and backup multi-channel electro-optical conversion units, a single-mode optical path interface is introduced, and the main and backup switching is realized through the main and backup multi-channel electro-optical conversion unit selection module;

[0054] (3) Adopting direct photoelectric conversion + n-wavelength demultiplexing scheme, the conversion of one serial optical signal to n parallel electrical signals is completed, realizing the function of a single multi-channel photoelectric conversion unit;

[0055] (4) The main and backup multi-channel optoelectronic conversion units are connected to each other through the optical path cascade module, and a single-mode optical path interface is introduced. The main and backup multi-channel optoelectronic conversion units are switched to the main and backup units through the selection module;

[0056] (5) Design and implement a fiber optic rotary connector, which uses direct fiber-optic shaft coupling and a high-reliability bearing assembly to achieve continuous data transmission under high-speed rotation. The fiber optic rotary connector has two single-mode optical path interfaces.

[0057] (6) A single-mode optical path interface as the output of the optical path cascade module of the main backup multi-channel electro-optical conversion unit and a single-mode optical path interface as the input of the optical path cascade module of the main backup multi-channel optoelectronic conversion unit are respectively connected to the single-mode optical path interfaces at both ends of the optical fiber rotary connector.

[0058] The scheme is as Figure 5 As shown, including:

[0059] 1. Main and multi-channel electro-optical conversion unit

[0060] The main multi-channel electro-optical conversion unit converts the electrical signal representing the valid data information into an optical signal, and sends the generated optical signal to the optical path cascade module of the main and backup multi-channel electro-optical conversion unit; this part mainly completes the development of the main multi-channel electro-optical conversion unit, specifically including the multi-channel electro-optical modulation module, the optical power monitoring module, the power management module, etc. Among them, the power management module is connected to the multi-channel electro-optical modulation module and the optical power monitoring module through wires, and the power management module provides +5V power supply for the multi-channel electro-optical modulation module and the optical power monitoring module; the optical power monitoring module is connected to the multi-channel electro-optical modulation module through optical fiber, and the optical power monitoring module collects the optical signal of the multi-channel electro-optical modulation module, thereby realizing the optical power monitoring of the multi-channel electro-optical modulation module, such as Figure 6 As shown:

[0061] The multi-channel electro-optical modulation module mainly includes the λ11 electro-optical modulation module, the λ12 electro-optical modulation module, and the wavelength division multiplexer; the electro-optical modulation modules all adopt the transparent transmission mode, that is, the external differential level signal is coupled to the light source driver chip in each electro-optical modulation module, and then directly drives the laser in each electro-optical modulation module to complete the electro-optical conversion in OOK mode. The input of each electro-optical modulation module is a differential input signal that complies with the TLK2711 protocol. The input connector adopts a high-frequency electrical connector, which is defined as HT11, HT12, etc. The output of each electro-optical modulation module is a single-mode optical fiber interface. The single-mode optical fiber interface of each multi-channel electro-optical modulation module is connected to the input optical interface of the multi-channel wavelength division multiplexer, and the output optical interface of the wavelength division multiplexer is connected to the external optical connector. The optical connector interface is defined as T11 to realize the parallel to serial conversion.

[0062] The optical power monitoring module is connected to the multi-channel electro-optical modulation module to complete the real-time acquisition of the laser output optical power during the electro-optical conversion process, and transmits the collected laser output optical power information to the upper-level control computer for product health status monitoring.

[0063] The power management module is connected to the other modules in the electro-optical conversion unit, and mainly includes DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc. It is used to provide controlled and reliable secondary power supply for multi-channel electro-optical modulation module and optical power monitoring module under the signal control of the upper control computer.

[0064] 2. Backup multi-channel electro-optical conversion unit

[0065] The backup multi-channel electro-optical conversion unit converts the electrical signal representing the valid data information into an optical signal. This part mainly completes the development of the backup multi-channel electro-optical conversion unit, including the multi-channel electro-optical modulation module, the optical power monitoring module, the power management module, etc. The power management module is connected to the multi-channel electro-optical modulation module and the optical power monitoring module through wires, and the power management module provides +5V power supply for the multi-channel electro-optical modulation module and the optical power monitoring module; the optical power monitoring module is connected to the multi-channel electro-optical modulation module through optical fiber, and the optical power monitoring module collects the optical signal of the multi-channel electro-optical modulation module, thereby realizing the optical power monitoring of the multi-channel electro-optical modulation module, such as Figure 7 As shown:

[0066] The multi-channel electro-optical modulation module mainly includes the λ21 electro-optical modulation module, the λ22 electro-optical modulation module, and the wavelength division multiplexer; the electro-optical modulation modules all adopt the transparent transmission mode, that is, the external differential level signal is coupled to the light source driver chip in each electro-optical modulation module, and then directly drives the laser in each electro-optical modulation module to complete the electro-optical conversion in OOK mode. The input of each electro-optical modulation module is a differential input signal that complies with the TLK2711 protocol. The input connector adopts a high-frequency electrical connector, which is defined as HT21, HT22, etc. The output of each electro-optical modulation module is a single-mode optical fiber interface. The single-mode optical fiber interface of each multi-channel electro-optical modulation module is connected to the input optical interface of the multi-channel wavelength division multiplexer, and the output optical interface of the wavelength division multiplexer is connected to the external optical connector. The optical connector interface is defined as T21 to realize the parallel to serial conversion.

[0067] The optical power monitoring module is connected to the multi-channel electro-optical modulation module to complete the real-time acquisition of the laser output optical power during the electro-optical conversion process, and transmits the acquired laser output optical power information to the upper-level control computer for product health status monitoring.

[0068] The power management module connects to the other modules in the electro-optical conversion unit and supplies power to them. It mainly consists of DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc. It is used to provide controlled and reliable secondary power supply for multi-channel electro-optical modulation module and optical power monitoring module under the signal control of the upper control computer.

[0069] 3. Main and backup multi-channel electro-optical conversion unit optical path cascade module

[0070] This part is mainly responsible for completing the optical path cascading work of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit.

[0071] Since there is usually only one optical path available on one side of the optical fiber rotary connector, and the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit each have one optical connector output, it is necessary to use an optical path cascade module to cascade the two optical connectors of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit, and then connect the one optical path interface output after cascading to the entrance of the optical fiber rotary connector.

[0072] As attached Fig.10As shown, the main backup multi-channel electro-optical conversion unit optical path cascade module is mainly implemented by two couplers, the main backup multi-channel electro-optical conversion unit optical connector interface T11 is connected to the OE11 optical interface (main optical interface) of the main backup multi-channel electro-optical conversion unit optical path cascade module, and the backup electro-optical conversion unit optical connector interface T21 is connected to the OE21 optical interface (backup optical interface) of the main backup electro-optical conversion unit optical path cascade module, ensuring that the optical signal can be output through the cascaded interface regardless of the main work or the backup work. The output interface after cascading is defined as OET1 (the output interface of the main backup multi-channel electro-optical conversion unit optical path cascade module). The optical signal is transmitted to the optical fiber rotary connector by the output interface OET1 (the output interface of the main backup multi-channel electro-optical conversion unit optical path cascade module).

[0073] 4. Main and backup multi-channel electro-optical conversion unit selection module

[0074] This part is mainly responsible for completing the selection of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit.

[0075] The main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit are designed as cold backup mode, and each is designed with a power management circuit, and an external configuration selection module is required to realize the switching of the main and backup.

[0076] As attached Fig.12 As shown, the main and backup multi-channel electro-optical conversion unit selection module mainly includes a decoding circuit and a driving circuit, wherein the decoding circuit mainly receives the digital power-on and power-off instructions of the upper control computer and decodes them, and then generates a power-on and power-off control pulse signal through the driving circuit composed of a pulse control device, which controls the on and off of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit respectively, thereby realizing the switching function of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit.

[0077] 5. Main and copy multi-channel photoelectric conversion unit

[0078] The main multi-channel photoelectric conversion unit converts the optical signal output by the optical path cascade module of the main and backup multi-channel photoelectric conversion unit into an electrical signal. This part mainly completes the development of the main multi-channel photoelectric conversion unit, including a multi-channel photoelectric detection module, an optical power monitoring module, and a power management module. The power management module is connected to the multi-channel photoelectric detection module and the optical power monitoring module through wires, and the power management module provides +5V power supply for the multi-channel photoelectric detection module and the optical power monitoring module; the optical power monitoring module is connected to the multi-channel photoelectric detection module through optical fiber, and the optical power monitoring module collects the optical signal of the multi-channel photoelectric detection module, thereby realizing the optical power monitoring of the multi-channel photoelectric detection module, such as Figure 8 As shown:

[0079] The multi-channel photoelectric detection module mainly includes the λ11 photoelectric detection module, the λ12 photoelectric detection module, and the wavelength division multiplexer. The photoelectric detection modules all use PIN detectors to complete the photoelectric conversion in OOK mode. The input of each photoelectric detection module is a single-mode fiber interface. The single-mode fiber interface of the multi-channel photoelectric detection module is connected to multiple output ends of the wavelength division multiplexer respectively. The only input end of the wavelength division multiplexer is connected to the external optical connector. The optical connector interface is defined as R11. The output of each photoelectric detection module is a differential signal that complies with the TLK2711 protocol. The output connectors are defined as HR11, HR12, etc.

[0080] The optical power monitoring module is connected to multiple photoelectric detection modules to complete the real-time acquisition of the detector optical power during each photoelectric conversion process, and transmit the collected photoelectric detector optical power information to the control computer for product health status monitoring.

[0081] The power management module connects multiple photoelectric detection modules and optical power monitoring modules and supplies power to them. It mainly consists of DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc. It is used to provide controlled and reliable secondary power supply for multiple photoelectric modulation modules and optical power monitoring modules under the signal control of the superior control computer.

[0082] 6. Backup multi-channel photoelectric conversion unit

[0083] This part mainly completes the development of backup multi-channel photoelectric conversion unit, including multi-channel photoelectric detection module, optical power monitoring module, and power management module. The power management module is connected to the multi-channel photoelectric detection module and the optical power monitoring module through wires, and the power management module provides +5V power supply for the multi-channel photoelectric detection module and the optical power monitoring module; the optical power monitoring module is connected to the multi-channel photoelectric detection module through optical fiber, and the optical power monitoring module collects the optical signal of the multi-channel photoelectric detection module, thereby realizing the optical power monitoring of the multi-channel photoelectric detection module, such as Fig. 9 As shown:

[0084] The multi-channel photoelectric detection module mainly includes the λ11 photoelectric detection module, the λ12 photoelectric detection module, and the demultiplexer; the photoelectric detection modules all use PIN detectors to complete the photoelectric conversion in OOK mode. The input of each photoelectric detection module is a single-mode fiber interface. The single-mode fiber interface of the multi-channel photoelectric detection module is connected to multiple output ends of the demultiplexer respectively. The only input end of the demultiplexer is connected to the external optical connector. The optical connector interface is defined as R21. The output of each photoelectric detection module is a differential signal that complies with the TLK2711 protocol. The output connectors are defined as HR21, HR22, etc.

[0085] The optical power monitoring module is connected to multiple photoelectric detection modules to complete the real-time acquisition of the detector output optical power during each photoelectric conversion process, and transmit the collected photoelectric detector output optical power information to the upper control computer for product health status monitoring.

[0086] The power management module connects multiple photoelectric detection modules and optical power monitoring modules and provides power for them. It mainly consists of DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc. It is used to provide controlled and reliable secondary power supply for multiple photoelectric modulation modules and optical power monitoring modules under external signal control.

[0087] 7. Main and backup multi-channel photoelectric conversion unit optical path cascade module

[0088] This part is mainly responsible for completing the optical path cascading work of the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit.

[0089] Since the optical fiber rotary transmission connector usually has only one optical path available, it is necessary to cascade the optical connectors of the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit first, and then connect the cascaded one-way optical connector to the optical fiber rotary transmission connector. The main and backup multi-channel optoelectronic conversion unit optical path cascade module decomposes the signal of the optical fiber rotary transmission connector into the main optical signal and the backup optical signal, and then sends them to the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit respectively;

[0090] like Fig.11 As shown, the main-backup multi-channel optoelectronic conversion unit optical path cascade module is mainly implemented by a 2-way coupler, the main-backup multi-channel optoelectronic conversion unit optical connector interface R11 is connected to the OO11 optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module, and the backup multi-channel optoelectronic conversion unit optical connector interface R21 is connected to the OO21 optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module, ensuring that no matter the main multi-channel optoelectronic conversion unit or the backup multi-channel optoelectronic conversion unit is working, the optical signal can be transmitted from the input optical interface OOR1 to the main multi-channel optoelectronic conversion unit or the backup multi-channel optoelectronic conversion unit through the main-backup multi-channel optoelectronic conversion unit optical path cascade module.

[0091] 8. Main and backup multi-channel photoelectric conversion unit selection module

[0092] This part is mainly responsible for completing the selection of the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit.

[0093] The main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit are designed as cold backup mode, and each is designed with a power management circuit. An external configuration selection module is required to realize the switching of the main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit.

[0094] like Fig.12 As shown, the main and backup multi-channel photoelectric conversion unit selection module mainly includes a decoding circuit and a driving circuit, wherein the decoding circuit mainly receives the digital power-on and power-off instructions of the upper control computer and decodes them, and then generates a power-on and power-off control pulse signal through a driving circuit composed of a pulse control device, which controls the power on and off of the main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit respectively, thereby realizing the switching function of the main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit.

[0095] 9. Fiber Optic Rotary Connector

[0096] This part is mainly used to complete the continuous transmission of optical signals in high-speed rotation scenarios.

[0097] like Fig.13 As shown in the figure, the optical fiber rotary connector is mainly composed of a bearing assembly, a collimated optical fiber, etc. It adopts a single-mode optical path spatial coupling alignment technology to ensure the continuous transmission of the light beam. There is an optical interface on each side, which is defined as OXR1 and OXT1 respectively. During use, the OET1 optical interface of the optical path cascade module of the main backup electro-optical conversion unit is connected to the OXR1 optical interface of the optical fiber rotary connector, and the OOR1 optical interface of the optical path cascade module of the main backup optoelectronic conversion unit is connected to the OXT1 optical interface of the optical fiber rotary connector, so as to realize the conduction of the entire transmission system.

[0098] Example:

[0099] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0100] The technical solution of the present invention is: to design according to the idea of ​​main multi-channel electro-optical conversion unit, backup multi-channel electro-optical conversion unit, main and backup multi-channel electro-optical conversion unit optical path cascade module, main and backup multi-channel electro-optical conversion unit selection module, main and backup multi-channel photoelectric conversion unit, backup multi-channel photoelectric conversion unit, main and backup multi-channel photoelectric conversion unit optical path cascade module, main and backup multi-channel photoelectric conversion unit selection module, and optical fiber rotary connector, and finally complete the construction of the system.

[0101] Take the 3-channel high-speed transmission requirement of a certain aerospace as an example. Fig.14 As shown, the image data of 6 channels of 3 cameras on the 360° rotating turntable need to be transmitted to the digital tube computer under the turntable. The rate of each channel is not less than 2Gbps, and each camera channel adopts a differential interface that meets the TLK2711 protocol.

[0102] In view of the above requirements, the present invention is implemented as follows.

[0103] 1. Main and multi-channel electro-optical conversion unit

[0104] This part is mainly responsible for completing the development of the main and multi-channel electro-optical conversion units.

[0105] The main multi-channel electro-optical conversion unit mainly includes λ11 electro-optical modulation module, λ12 electro-optical modulation module, and λ13 electro-optical modulation module, of which λ11 is 1270nm, λ12 is 1310nm, and λ13 is 1350nm. The electro-optical modulation modules all adopt transparent transmission mode, and the light source modulation driver device uses Max3738 to complete the electro-optical conversion in OOK mode. The input of each electro-optical modulation module is a differential input signal that meets the TLK2711 protocol. The input connectors are defined as HT11, HT12, and HT13 respectively. The signal rate of each channel is 2Gbps, and the output of each electro-optical modulation module is a single-mode optical fiber interface. The single-mode optical fiber interfaces of the three electro-optical modulation modules are fused with the three input ends of the wavelength division multiplexer, and the output end of the wavelength division multiplexer is connected to the external optical connector, which is defined as T11.

[0106] The optical power monitoring module is connected to the 3-way electro-optical modulation module to transmit the collected laser output power information to the upper-level control computer for product health status monitoring.

[0107] The power management module mainly includes DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc., which are used to provide controlled and reliable secondary power supply under the control of the superior control computer.

[0108] 2. Backup multi-channel electro-optical conversion unit

[0109] This part mainly completes the development of backup multi-channel electro-optical conversion unit.

[0110] The main multi-channel electro-optical conversion unit mainly includes λ21 electro-optical modulation module, λ22 electro-optical modulation module, and λ23 electro-optical modulation module, of which λ21 is 1270nm, λ22 is 1310nm, and λ23 is 1350nm. The electro-optical modulation modules all adopt transparent transmission mode, and the light source modulation driver device uses Max3738. Based on the CML level standard, the electro-optical conversion is completed in OOK mode. The input of each electro-optical modulation module is a differential input signal that meets the TLK2711 protocol. The input connectors are defined as HT21, HT22, and HT23 respectively. The signal rate of each channel is 2Gbps, and the output of each electro-optical modulation module is a single-mode optical fiber interface. The single-mode optical fiber interface of the three electro-optical modulation modules is fused with the three input ends of the multi-channel wavelength division multiplexer, and the output end of the wavelength division multiplexer is connected to the external optical connector, defined as T21, to achieve parallel to serial conversion.

[0111] The optical power monitoring module is connected to the 3-way electro-optical modulation module to transmit the collected laser output power information to the upper-level control computer for product health status monitoring.

[0112] The power management module mainly includes DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc., which are used to provide controlled and reliable secondary power supply under the control of the superior control computer.

[0113] 3. Main and backup multi-channel electro-optical conversion unit optical path cascade module

[0114] This part is mainly responsible for completing the optical path cascading work of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit.

[0115] Since there is usually only one optical path available on one side of the optical fiber rotary transmission connector, and the main electro-optical conversion unit and the backup electro-optical conversion unit each have one optical connector output, it is necessary to use an optical path cascade module to cascade the two optical connectors of the main electro-optical conversion unit and the backup electro-optical conversion unit, and then connect the one optical path interface output after cascading to the entrance end of the optical fiber rotary transmission connector.

[0116] like Figure 6 As shown, the main backup multi-channel electro-optical conversion unit optical path cascade module is mainly implemented by a 2-way coupler, the main backup multi-channel electro-optical conversion unit optical connector interface T11 is connected to the OE11 optical interface (main optical interface) of the main backup multi-channel electro-optical conversion unit optical path cascade module, and the backup electro-optical conversion unit optical connector interface T21 is connected to the OE21 optical interface (backup optical interface) of the main backup electro-optical conversion unit optical path cascade module, ensuring that the optical signal can be output through the cascaded interface regardless of whether it is the main work or the backup work. The output interface after cascading is defined as OET1 (electro-optical conversion unit optical path cascade module output interface). The optical signal is transmitted to the optical fiber rotary connector by the output interface OET1 (electro-optical conversion unit optical path cascade module output interface), and the connectors all use FC connectors.

[0117] 4. Main and backup multi-channel electro-optical conversion unit circuit selection module

[0118] This part is mainly responsible for completing the selection of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit.

[0119] The main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit are designed as cold backup mode, and each is designed with a power management circuit, and an external configuration selection module is required to realize the switching of the main and backup.

[0120] like Figure 8As shown, the main and backup multi-channel electro-optical conversion unit selection module mainly includes a decoding circuit and a driving circuit, wherein the decoding circuit mainly receives the digital power-on and power-off instructions of the upper control computer and decodes them, and then generates a power-on and power-off control pulse signal through the driving circuit composed of a pulse control device, which controls the on and off of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit respectively, thereby realizing the switching function of the main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit.

[0121] 5. Main and copy multi-channel photoelectric conversion unit

[0122] This part is mainly responsible for completing the development of the main and multi-channel photoelectric conversion units.

[0123] The main multi-channel photoelectric conversion unit mainly includes 3 channels, namely, λ11 photoelectric detection module, λ12 photoelectric detection module, and λ13 photoelectric detection module. Among them, λ11 is 1270nm, λ12 is 1310nm, and λ13 is 1350nm. The photoelectric detection modules all use PIN detectors, and the limiting amplifier uses MAX3747, and the photoelectric conversion is completed in OOK mode. The input of each photoelectric detection module is a single-mode optical fiber interface. The single-mode optical fiber interfaces of the multi-channel photoelectric detection modules are respectively connected to multiple output ends of the demultiplexer. The only input end of the demultiplexer is connected to the external optical connector. The optical connector interface is defined as R11. The output of each photoelectric detection module is a differential signal of the TLK2711 protocol, and the output connectors are defined as HR11, HR12, and HR13 respectively.

[0124] The optical power monitoring module is connected to three photoelectric detection modules to monitor the output optical power of the detector during the photoelectric conversion process of each channel, and is used for product health status monitoring.

[0125] The power management module mainly includes DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc., which are used to provide controlled and reliable secondary power supply under the control of the superior control computer.

[0126] 6. Backup multi-channel photoelectric conversion unit

[0127] This part mainly completes the development of backup multi-channel photoelectric conversion unit.

[0128] The backup multi-channel photoelectric conversion unit mainly includes 3 channels, namely, λ21 photoelectric detection module, λ22 photoelectric detection module, and λ23 photoelectric detection module. Among them, λ21 is 1270nm, λ22 is 1310nm, and λ23 is 1350nm. The photoelectric detection modules all use PIN detectors, and the limiting amplifier uses MAX3747, and the photoelectric conversion is completed in OOK mode. The input of each photoelectric detection module is a single-mode optical fiber interface. The single-mode optical fiber interfaces of the multi-channel photoelectric detection modules are respectively connected to multiple output ends of the demultiplexer. The only input end of the demultiplexer is connected to the external optical connector. The optical connector interface is defined as R21. The output of each photoelectric detection module is a differential signal of the TLK2711 protocol. The output connectors are defined as HR21, HR22, and HR23, respectively, and the rate is 2Gbps.

[0129] The optical power monitoring module is connected to three photoelectric detection modules to monitor the output optical power of the detector during the photoelectric conversion process of each channel, and is used for product health status monitoring.

[0130] The power management module mainly includes DC / DC conversion circuit, surge suppression circuit, relay network, filter network, etc., which is used to provide controlled and reliable secondary power supply under external signal control.

[0131] 7. Main and backup multi-channel photoelectric conversion unit optical path cascade module

[0132] This part is mainly responsible for completing the optical path cascading work of the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit.

[0133] Since the optical fiber rotary transmission connector usually has only one optical path available, it is necessary to cascade the optical connectors of the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit first, and then connect the cascaded optical connector to the optical fiber rotary transmission connector. The main and backup optoelectronic conversion unit optical path cascade module decomposes the signal of the optical fiber rotary transmission connector into the main optical signal and the backup optical signal, and then sends them to the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit respectively;

[0134] like Figure 7 As shown, the main-backup multi-channel optoelectronic conversion unit optical path cascade module is mainly implemented by a 2-way coupler, the main-backup multi-channel optoelectronic conversion unit optical connector interface R11 is connected to the OO11 optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module, and the backup multi-channel optoelectronic conversion unit optical connector interface R21 is connected to the OO21 optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module, ensuring that no matter the main multi-channel optoelectronic conversion unit or the backup multi-channel optoelectronic conversion unit is working, the optical signal can be transmitted from the input optical interface OOR1 to the main multi-channel optoelectronic conversion unit or the backup multi-channel optoelectronic conversion unit through the main-backup multi-channel optoelectronic conversion unit optical path cascade module.

[0135] 8. Main and backup multi-channel photoelectric conversion unit selection module

[0136] This part is mainly responsible for completing the selection of the main multi-channel optoelectronic conversion unit and the backup multi-channel optoelectronic conversion unit.

[0137] The main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit are designed as cold backup mode, and each is designed with a power management circuit. An external configuration selection module is required to realize the switching of the main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit.

[0138] like Figure 8 As shown, the main and backup multi-channel photoelectric conversion unit selection module mainly includes a decoding circuit and a driving circuit, wherein the decoding circuit mainly receives the digital power-on and power-off instructions of the upper control computer and decodes them, and then generates a power-on and power-off control pulse signal through a driving circuit composed of a pulse control device, which controls the power on and off of the main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit respectively, thereby realizing the switching function of the main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit.

[0139] 9. Fiber Optic Rotary Connector

[0140] This part is mainly to complete the development of optical fiber rotary connector.

[0141] The optical fiber rotary connector is mainly composed of bearing components, collimated optical fibers, etc. It adopts single-mode optical path spatial coupling alignment technology to ensure continuous light beam transmission. There is an optical interface on each side, which is defined as OXR1 and OXT1 respectively. During use, the OET1 optical interface of the optical path cascade module of the main backup electro-optical conversion unit is connected to the OXR1 optical interface of the optical fiber rotary connector, and the OOR1 optical interface of the optical path cascade module of the main backup optoelectronic conversion unit is connected to the OXT1 optical interface of the optical fiber rotary connector, so as to realize the conduction of the entire transmission system.

[0142] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in this field.

Claims

1. A miniaturized, highly reliable multiplexed optical fiber rotary transmission system for aerospace use, characterized in that include: A main multi-channel electro-optical conversion unit, a backup multi-channel electro-optical conversion unit, a main backup multi-channel electro-optical conversion unit optical path cascade module, a main backup multi-channel electro-optical conversion unit selection module, a main multi-channel photoelectric conversion unit, a backup multi-channel photoelectric conversion unit, a main backup multi-channel photoelectric conversion unit optical path cascade module, a main backup multi-channel photoelectric conversion unit selection module, and an optical fiber rotary connector, wherein: The main and backup multi-channel electro-optical conversion unit selection module receives the instruction of the upper control computer and sends a power-on and power-off control pulse signal to the main and backup multi-channel electro-optical conversion unit or the backup multi-channel electro-optical conversion unit to realize the main and backup switching; The main multi-channel electro-optical conversion unit and the backup multi-channel electro-optical conversion unit have the same internal structure design, converting the electrical signal representing the valid data information into an optical signal, and sending the generated optical signal to the main and backup multi-channel electro-optical conversion unit optical path cascade module; The main backup multi-channel electro-optical conversion unit optical path cascading module cascades the optical connectors of the main multi-channel electro-optical conversion unit or the backup multi-channel electro-optical conversion unit, and sends one optical path signal output after cascading to the optical fiber rotary connector; The optical fiber rotary connector receives the optical path signal output by the optical path cascade module of the main backup multi-channel electro-optical conversion unit, and forwards it to the optical path cascade module of the main backup multi-channel photoelectric conversion unit, completing the continuous transmission of light in the high-speed rotation scene; The optical path cascade module of the main and backup multi-channel photoelectric conversion units receives the optical signal sent by the optical fiber rotary connector and sends it to the main and backup multi-channel photoelectric conversion units or the backup multi-channel photoelectric conversion units; The main and backup multi-channel photoelectric conversion unit selection module receives the instruction of the upper control computer and sends a power-on and power-off control pulse signal to the main and backup multi-channel photoelectric conversion unit or the backup multi-channel photoelectric conversion unit, thereby realizing the main and backup switching; The main multi-channel photoelectric conversion unit and the backup multi-channel photoelectric conversion unit have the same internal structure design, and convert the optical signal output by the optical path cascade module of the main and backup multi-channel photoelectric conversion units into an electrical signal.

2. The miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use according to claim 1, characterized in that: The main multi-channel electro-optical conversion unit includes a multi-channel electro-optical modulation module, an optical power monitoring module, a power management module and a wavelength division multiplexer. Specifically: Each electro-optical modulation module in the multi-channel electro-optical modulation module adopts transparent transmission mode and completes electro-optical conversion in OOK mode; the input of each electro-optical modulation module is a differential input signal that meets the TLK2711 protocol, and the output is a single-mode optical fiber interface; The single-mode optical fiber interface of each electro-optical modulation module is connected to the input optical interface of the wavelength division multiplexer, and the output optical interface of the wavelength division multiplexer is connected to the optical connector leading out to the outside; The optical power monitoring module is connected to each electro-optical modulation module to complete the real-time acquisition of the laser output power during the electro-optical conversion process, and transmits the acquired laser output power information to the upper control computer for product health status monitoring; The power management module is connected to each electro-optical modulation module and the optical power monitoring module, and provides a controlled and reliable secondary power supply for the multi-channel electro-optical modulation modules and the optical power monitoring modules under the control of the upper control computer.

3. The miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use according to claim 1, characterized in that: The main multi-channel electro-optical conversion unit, the backup multi-channel electro-optical conversion unit, the main multi-channel photoelectric conversion unit, and the backup multi-channel photoelectric conversion unit are designed in a cold backup mode.

4. The miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use according to claim 1, characterized in that: The main backup multi-channel electro-optical conversion unit gating module includes a decoding circuit and a driving circuit, wherein: The decoding circuit receives and decodes the digital power-on and power-off instructions from the upper control computer, and then generates a power-on and power-off control pulse signal through a driving circuit composed of pulse control devices, which is sent to the main multi-channel electro-optical conversion unit or the backup multi-channel electro-optical conversion unit.

5. The miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use according to claim 1, characterized in that: The main backup multi-channel photoelectric conversion unit selection module includes a decoding circuit and a driving circuit, wherein: The decoding circuit receives the digital power-on and power-off instructions from the upper control computer and decodes them. Then, the driving circuit composed of pulse control devices generates power-on and power-off control pulse signals and sends them to the main multi-channel photoelectric conversion unit or the backup multi-channel photoelectric conversion unit.

6. The miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use according to claim 1, characterized in that: The optical path cascade module of the main backup multi-channel electro-optical conversion unit includes two couplers; The main optical connector interface of the main backup multi-channel electro-optical conversion unit optical path cascade module is connected to the main multi-channel electro-optical conversion unit optical connector interface, and the backup optical interface of the main backup multi-channel electro-optical conversion unit optical path cascade module is connected to the backup multi-channel electro-optical conversion unit optical connector interface; The optical path cascade module of the main backup multi-channel electro-optical conversion unit transmits the optical signal to the optical fiber rotary connector through the cascaded optical connector.

7. The miniaturized, highly reliable multiplexed optical fiber rotary transmission system for aerospace use according to claim 1, characterized in that: The main backup multi-channel photoelectric conversion unit optical path cascade module includes two couplers; The main optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module is connected to the main-backup multi-channel optoelectronic conversion unit optical connector interface, and the backup optical interface of the main-backup multi-channel optoelectronic conversion unit optical path cascade module is connected to the backup multi-channel optoelectronic conversion unit optical connector interface; The main-backup multi-channel optoelectronic conversion unit cascade module receives the optical signal output from the optical fiber rotary connector, and then transmits the optical signal to the main-backup multi-channel optoelectronic conversion unit or the backup multi-channel optoelectronic conversion unit.

8. The miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use according to claim 1, characterized in that: The optical fiber rotary connector adopts single-mode optical path spatial coupling alignment technology, and has an optical interface on each side, which is respectively connected to the output optical interface of the main backup multi-channel electro-optical conversion unit optical path cascade module and the input optical interface of the main backup multi-channel optoelectronic conversion unit optical path cascade module.

9. The miniaturized, highly reliable multiplexed optical fiber rotation transmission system for aerospace use according to claim 1, characterized in that: The main multi-channel photoelectric conversion unit includes a multi-channel photoelectric detection module, an optical power monitoring module, a power management module and a wavelength division multiplexer. Specifically: Each photoelectric detection module uses a PIN detector to complete the photoelectric conversion in OOK mode; the input of each photoelectric detection module is a single-mode optical fiber interface, and the output of each photoelectric detection module is a differential signal that complies with the TLK2711 protocol. The single-mode optical fiber interface at the input end of each photoelectric detection module is connected to the output end of the demultiplexer, and the input end of the demultiplexer is led out to the external optical connector; The optical power monitoring module is connected to each photoelectric detection module to complete the real-time acquisition of the detector output optical power during the photoelectric conversion process of each channel, which is used for product health status monitoring; The power management module is connected to each photoelectric detection module and the optical power monitoring module, and provides a controlled and reliable secondary power supply for the multi-channel photoelectric detection modules and the optical power monitoring modules under the control of the upper control computer.

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