Photoelectric transmission structure and photoelectric signal transmission system

Abstract

The invention relates to a photoelectric transmission structure and a photoelectric signal transmission system. Optical fibers are arranged in a rotor and a stator on a slip ring connecting seat; the top end face of the lower optical fiber is attached to the bottom end face of the upper optical fiber. The optical fiber at least comprises a first fiber core and a first conductive cladding concentric with the first fiber core; an electric brush structure is omitted, the structure of a traditional photoelectric slip ring is simplified, that is, the structure of the optical fiber is optimized, and the stator and the rotor cancel the conductive function and do not conduct electricity; the slip ring connecting seat enables the stator and the rotor to be connected, the top end face of the lower optical fiber is attached to the bottom end face of the upper optical fiber, in the rotating process of the rotor, the first conductive cladding layers of the two optical fibers are in contact all the time to transmit electric signals, and the first fiber cores of the two optical fibers are in contact all the time to transmit optical energy or optical fiber sensing signals. The problem that a photoelectric slip ring connector is complex in structure is solved. And meanwhile, the structures for transmitting the electric signals and the optical signals are coaxially arranged, so that the inter-core alignment error is reduced.

Description

Technical Field

[0001] This application relates to the field of communications, and particularly to an optoelectronic transmission structure and an optoelectronic signal transmission system. Background Art

[0002] With the rapid development of optical fiber communication technology, optical fiber communication and optical fiber sensing technology have been widely used. Taking drilling as an example, during the drilling process of oil and gas wells, the drill bit usually works at a depth of several hundred meters to several kilometers underground. In order to control the rotation speed of the drill bit in real time and monitor information such as the attitude of the drill bit and the ambient temperature, optical fibers are required for communication and sensing.

[0003] During the drilling process, since the derrick located at the upper part does not rotate, the stator part of the optoelectronic slip ring is generally placed on one side of the derrick and is connected upward to the monitoring equipment. The rotating rod located at the lower part needs to rotate, and the rotor part of the optoelectronic slip ring is generally connected to the optical fiber on the rotating rod side.

[0004] During the drilling process, in order to ensure the transmission of electric energy, electrical signals, and optical signals while the connection rotates, a device combining an electric slip ring and a smooth ring is mostly used; specifically, a single-core optical fiber or a multi-core optical fiber is placed at the central position of the through-hole of the electric slip ring; the electrical part of the optoelectronic slip ring transmits electric energy and electrical signals, and the optical fiber part of the optoelectronic slip ring transmits light energy and optical signals, but there are the following problems:

[0005] (1) Most of the signal generation and monitoring systems located on the well use a dual-wavelength light source or a multi-wavelength light source in combination with a wavelength division multiplexer (abbreviated as WDM) to achieve signal aggregation and decomposition, resulting in complex optical path design and complex equipment light source control circuits.

[0006] (2) The optoelectronic slip ring connector couples optical signals and electrical signals separately, resulting in a complex structure of the optoelectronic slip ring connector. For example, electrical structures (brushes) need to be provided for the slip ring stator and rotor.

[0007] (3) In the scenario of integrating communication and sensing, most systems use multi-core optical fibers, and the cores for communication and sensing are distributed around the center of the optical fiber. This non-concentric circle design makes it necessary to meet the requirements of rotational alignment and reduced docking loss when using the slip ring connector. Therefore, a Dove prism or planetary gears are used to complete the optical path docking, resulting in a large core-to-core alignment error. Summary of the Invention

[0008] Embodiments of this application provide an optoelectronic transmission structure and an optoelectronic signal transmission system to solve the problem of the complex structure of the optical signals and electrical signals coupled by the optoelectronic slip ring connector in related technologies.

[0009] In a first aspect, an optoelectronic transmission structure is provided, which includes:

[0010] A stator, which is mounted on a slip ring connection base and has optical fibers disposed therein;

[0011] A rotor, which is rotatably connected to the slip ring connection base and is coaxially disposed below the stator; optical fibers are also disposed in the rotor;

[0012] Wherein, the two optical fibers are coaxially disposed; the top end face of the optical fiber located below is in contact with the bottom end face of the optical fiber located above; the optical fiber at least includes a first core and a first conductive cladding concentric with the first core.

[0013] In some embodiments, in the radial direction of the optical fiber from the inside to the outside, and outside the first conductive cladding, a plurality of photoconductive layers are sequentially provided;

[0014] Each of the photoconductive layers includes a second core and a second conductive cladding that are both annular; the second conductive cladding is located outside the second core;

[0015] The first core is a single-mode core; the second core is a multi-mode core.

[0016] In some embodiments, both the first conductive cladding and the second conductive cladding include a glass cladding; metal particles are doped in the glass cladding;

[0017] The refractive index of the glass cladding of the first conductive cladding is less than the refractive index of the first core;

[0018] The refractive index of the glass cladding of the second conductive cladding is less than the refractive index of the second core.

[0019] In some embodiments, both the first conductive cladding and the second conductive cladding include a glass cladding; a metal coating is provided on the inner surface or the outer surface of the glass cladding;

[0020] The refractive index of the glass cladding of the first conductive cladding is less than the refractive index of the first core;

[0021] The refractive index of the glass cladding of the second conductive cladding is less than the refractive index of the second core.

[0022] In some embodiments, a filter element is prefabricated on at least one of the top end face of the optical fiber located below and the bottom end face of the optical fiber located above;

[0023] The filter element is provided with a first filter region and a second filter region corresponding to the first core and the second core; the filter wavelengths of the first filter region and the second filter region are different;

[0024] The filter element is provided with a first conductive region and a second conductive region corresponding to the first conductive cladding and the second conductive cladding.

[0025] In some embodiments, a conductive collimating lens is further disposed within the slip ring connector seat between the top end face of the optical fiber located below and the bottom end face of the optical fiber located above.

[0026] In some embodiments, in the radial direction from the inside to the outside of the conductive collimating lens, the conductive collimating lens sequentially includes a first lens region, a second lens region, a third lens region, and a fourth lens region;

[0027] The second lens region and the fourth lens region are doped with metal particles and are in contact with the corresponding first conductive cladding and second conductive cladding;

[0028] The refractive index of the second lens region is less than that of the first lens region; the refractive index of the fourth lens region is less than that of the third lens region.

[0029] In some embodiments, a transparent lubricant is provided between the second lens region and the fourth lens region and the two optical fibers, and the refractive index of the lubricant is approximately 1.50 - 1.6.

[0030] In some embodiments, the top and bottom of the first lens region and the third lens region are spherical; or,

[0031] An anti-reflection film is provided on the top and bottom of the first lens region and the third lens region.

[0032] In a second aspect, an optoelectronic signal transmission system is provided, which includes:

[0033] A light source and a detector located on the ground;

[0034] A remote detection device, which is connected to the light source and the detector through an optoelectronic transmission structure.

[0035] The beneficial effects brought by the technical solutions provided in this application include:

[0036] The embodiments of the present application provide an optoelectronic transmission structure and an optoelectronic signal transmission system. Since the rotor is rotatably connected to the slip ring connection seat and coaxially arranged below the stator; the optical fibers in the rotor and the stator are coaxially arranged; the top end face of the optical fiber located below is attached to the bottom end face of the optical fiber located above; the optical fiber at least includes a first core and a first conductive cladding concentric with the first core; a coating layer is provided on the outermost side of the optical fiber to protect the entire optical fiber. The above cancels the brush structure and simplifies the structure of the traditional optoelectronic slip ring. Then, the structure of the optical fiber is optimized. The stator and the rotor cancel the conductive function and do not conduct electricity. The first conductive cladding of the optical fiber is used for conducting electricity, and the first core transmits optical signals. When in use, both the stator and the rotor of the slip ring connection seat are provided with optical fibers. The slip ring connection seat connects the stator and the rotor. The top end face of the optical fiber located below is attached to the bottom end face of the optical fiber located above. Thus, during the rotation of the rotor, the first conductive claddings of the two optical fibers are always in contact and can conduct electricity to realize the transmission of electrical signals. The first cores of the two optical fibers are always in contact and can transmit light energy or optical fiber sensing signals. The problem of the complex structure of the optical signals and the coupled electrical signals transmitted by the optoelectronic slip ring connector in the related art is solved while ensuring the signal transmission function. At the same time, the structures for transporting electrical signals and optical signals are coaxially arranged above, reducing the core alignment error. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 Exploded structural schematic diagram of the optoelectronic transmission structure provided by the embodiment of the present application;

[0039] Figure 2 Exploded structural schematic diagram of the optoelectronic transmission structure with a conductive collimating lens provided by the embodiment of the present application;

[0040] Figure 3 Radial cross-sectional view of the multi-core optical fiber doped with metal particles provided by the embodiment of the present application;

[0041] Figure 4 Radial cross-sectional view of the multi-core optical fiber with a metal coating provided by the embodiment of the present application;

[0042] Figure 5 Internal structural schematic diagram of the optoelectronic cylindrical collimating lens provided by the embodiment of the present application;

[0043] Figure 6Schematic diagram of the optical network model of the optical and electrical signal transmission system with an optical and electrical slip ring provided by the embodiment of the present application.

[0044] In the figure: 1, stator; 2, optical fiber; 201, first core; 202, first conductive cladding; 203, second core; 204, second conductive cladding; 205, metal coating; 206, coating layer; 3, rotor; 4, slip ring connection seat; 5, conductive collimating lens; 501, first lens area; 502, third lens area; 503, second lens area; 504, fourth lens area. Detailed implementation manners

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0046] For ease of understanding, the relevant technical terms involved in the embodiments of the present application are explained and described below.

[0047] Axial direction: It can be understood as the axial direction of the optical fiber, which is equivalent to the extension direction of the optical fiber.

[0048] Radial direction: Perpendicular to the axial direction.

[0049] Remote device: The device on the side far from the monitoring system.

[0050] The "multi-core optical fiber" described in the present disclosure is not limited to the form of two cores, but can adopt any number of core forms, as long as it is a concentric core and a conductive cladding. For example, it can also be in the form of three cores, etc.

[0051] During the drilling process, to ensure the transmission of electric energy, electrical signals, and optical signals while the connection rotates, a device combining an electrical slip ring and a smooth ring is mostly used; specifically, a single-core optical fiber or a multi-core optical fiber is placed at the central position of the through-hole of the electrical slip ring; the electrical part of the optical and electrical slip ring transmits electric energy and electrical signals, and the optical fiber part of the optical and electrical slip ring transmits light energy and optical signals, but there are the following problems:

[0052] (1) Most of the signal generation and monitoring systems located on the well use a dual-wavelength light source or a multi-wavelength light source in combination with a wavelength division multiplexer (abbreviation: WDM) to achieve signal aggregation and decomposition, resulting in complex optical path design and complex equipment light source control circuits.

[0053] (2) The optoelectronic slip ring connector couples optical signals and electrical signals separately, resulting in the problem of complex structure of the optoelectronic slip ring connector. For example, electrical structures (brushes) need to be set on the slip ring stator and rotor.

[0054] (3) In the scenario of integrated communication and sensing, most systems use multi-core optical fibers. The cores for communication and sensing are distributed around the center of the optical fiber. This non-concentric design makes it necessary to meet the requirements of rotational alignment and reduced docking loss when using the slip ring connector. Therefore, Dove prisms or planetary gears are used to complete the optical path docking, resulting in a large inter-core alignment error.

[0055] (4) The electrical part of the existing optoelectronic slip ring transmits electrical energy and electrical signals, resulting in the problem that the electrical energy transmission interferes with the electrical signals.

[0056] The embodiments of the present application provide an optoelectronic transmission structure and an optoelectronic signal transmission system to solve the above problems, which will be described one by one below.

[0057] Reference Figures 1 - 4 , first, to solve the problem that the optoelectronic slip ring connector couples optical signals and electrical signals separately, resulting in the problem of complex structure of the optoelectronic slip ring connector. For example, electrical structures (brushes) need to be set on the slip ring stator and rotor, and in the scenario of integrated communication and sensing, most systems use multi-core optical fibers. The cores for communication and sensing are distributed around the center of the optical fiber. This non-concentric design makes it necessary to meet the requirements of rotational alignment and reduced docking loss when using the slip ring connector. Therefore, Dove prisms or planetary gears are used to complete the optical path docking, resulting in a large inter-core alignment error.

[0058] In the first aspect, an optoelectronic transmission structure includes:

[0059] A stator 1, which is installed on the slip ring connection seat 4 and has an optical fiber 2 inside it;

[0060] A rotor 3, which is rotatably connected to the slip ring connection seat 4 and is coaxially arranged below the stator 1; an optical fiber 2 is also provided inside the rotor 3;

[0061] Among them, the two optical fibers 2 are coaxially arranged; the top end face of the optical fiber 2 located below is in contact with the bottom end face of the optical fiber 2 located above; the optical fiber 2 at least includes a first core 201 and a first conductive cladding 202 concentric with the first core 201. A coating layer 206 is provided on the outermost of the optical fiber 2 to protect the entire optical fiber 2.

[0062] The above cancels the brush structure, simplifies the structure of the traditional optical fiber slip ring, and then optimizes the structure of the optical fiber 2. The stator 1 and the rotor 3 cancel the conductive function and do not conduct electricity. The first conductive cladding 202 of the optical fiber 2 is used for conducting electricity, and the first fiber core 201 transmits optical signals. When in use, the stator 1 and the rotor 3 of the slip ring connecting seat 4 are both provided with the optical fiber 2, and the slip ring connecting seat 4 connects the stator 1 and the rotor 3. The top end face of the optical fiber 2 located below is attached to the bottom end face of the optical fiber 2 located above. Thus, during the rotation of the rotor 3, the first conductive claddings 202 of the two optical fibers 2 are always in contact, enabling electricity conduction and realizing the transmission of electrical signals. The first fiber cores 201 of the two optical fibers 2 are always in contact, enabling the transmission of light energy or optical fiber sensing signals. While ensuring the signal transmission function, the problem of the complex structure of the optical signal and the coupled electrical signal transmitted by the optical fiber slip ring connector in the related art is solved.

[0063] In addition, the above-mentioned stator 1 and rotor 3 are concentric and coaxial, and the two optical fibers 2 above and below extend axially and are coaxial and concentric, ensuring that the two optical fibers 2 above and below are coaxial and concentric, avoiding the problem of large core alignment errors, and eliminating the need to use Dove prisms or planetary gears to complete the optical path docking. Further, the structure of the traditional optical fiber slip ring is simplified, that is, the brushless optical fiber slip ring is used for optical and electrical signal transmission, and the link structure is simplified, reducing the link loss.

[0064] It should be understood that the structure of the optical fiber slip ring in this application depends on the special optical fiber 2 described in this application; in addition, when the stator 1 and the rotor 3 are concentric and coaxial, as long as the axial channels for installing the optical fiber 2 are concentric and coaxial, it may not be limited to the case where the axial channels are located at the central axis of the stator 1 and the rotor 3.

[0065] In some preferred embodiments, to achieve the transmission of multiple signals and improve the transmission capacity of the optical fiber, that is, to transmit multiple signals, the following settings are made:

[0066] In the radial direction of the optical fiber 2 from the inside to the outside, and outside the first conductive cladding 202, a plurality of photoconductive layers are sequentially provided;

[0067] Each photoconductive layer includes a second fiber core 203 and a second conductive cladding 204 that are both annular; the second conductive cladding 204 is located outside the second fiber core 203;

[0068] The first fiber core 201 is a single-mode fiber core; the second fiber core 203 is a multi-mode fiber core.

[0069] Reference Figure 3 and Figure 4, taking the example that a photoconductive layer is successively provided on the outer side of the first conductive cladding 202, the number of photoconductive layers can be set as required; when the number of photoconductive layers increases, the diameter of the axial channel at the central axes of the stator 1 and the rotor 3 also needs to be correspondingly enlarged. Therefore, without changing the outer diameters of the stator 1 and the rotor 3, the signal transmission ability of the photoelectric transmission structure can be achieved.

[0070] Further, referring to Figure 3 , the specific structures of the first conductive cladding 202 and the second conductive cladding 204 are introduced, that is, both the first conductive cladding 202 and the second conductive cladding 204 include a glass cladding; metal particles are doped in the glass cladding; electrical signals are transmitted through the metal particles.

[0071] The refractive index of the glass cladding of the first conductive cladding 202 is less than the refractive index of the first core 201; the refractive index of the glass cladding of the second conductive cladding 204 is less than the refractive index of the second core 203. The reason for the requirement of the refractive index is that the first conductive cladding 202 is not to transmit optical signals. The refractive indices of the first core 201 and the second core 203 are not specifically limited because actual requirements vary.

[0072] Further, referring to Figure 4 , another specific structure of the first conductive cladding 202 and the second conductive cladding 204 is introduced, that is, both the first conductive cladding 202 and the second conductive cladding 204 include a glass cladding; a metal coating 205 is provided on the inner surface or the outer surface of the glass cladding; the thickness of the metal coating 205 and whether it is on the inner surface or the outer surface of the glass cladding can be selected as required. The material of the metal coating 205 is a good electrical conductor such as gold or silver.

[0073] The refractive index of the glass cladding of the first conductive cladding 202 is less than the refractive index of the first core 201;

[0074] The refractive index of the glass cladding of the second conductive cladding 204 is less than the refractive index of the second core 203.

[0075] Regarding the problem of large inter-core alignment error and the problem of electrical energy transmission interfering with electrical signals, please refer to the following explanations:

[0076] In some preferred embodiments, at least one of the top end face of the optical fiber 2 located below and the bottom end face of the optical fiber 2 located above is prefabricated with a light filtering member; the light filtering member is a light filtering film or a light filtering lens.

[0077] The light filtering member is provided with a first light filtering region and a second light filtering region corresponding to the first core 201 and the second core 203; the light filtering wavelengths of the first light filtering region and the second light filtering region are different;

[0078] The filter element is provided with a first conductive region and a second conductive region corresponding to the first conductive cladding 202 and the second conductive cladding 204.

[0079] Through the first filtering region, the second filtering region, the first conductive region and the second conductive region, the above filter element realizes filtering during the conduction process, screens light of specific wavelengths, and can multiplex and demultiplex optical communication signals and optical sensing signals according to wavelengths. There is no need to set a WDM device outside the light source of the optoelectronic signal transmission system, which simplifies the structure and the link. The first conductive region and the second conductive region separate the first filtering region and the second filtering region, solving the problem of interference caused by electric energy transmission to electric signals.

[0080] The filter film or the filter lens can be prefabricated on the optical fiber 2 or can be arranged in the slip ring connector 4. Of course, the best way is to fabricate them sequentially when manufacturing the optical fiber 2.

[0081] In some preferred embodiments, referring to Figure 2 and Figure 5 , in order to further reduce the alignment error between the optical cores, reduce the butt joint loss, and facilitate the coupling of optoelectronic signals, the following settings are made:

[0082] The slip ring connector 4 is further provided with a conductive collimating lens 5 between the top end face of the optical fiber 2 located below and the bottom end face of the optical fiber 2 located above. The conductive collimating lens 5 is preferably cylindrical.

[0083] In the radial direction of the conductive collimating lens 5 from the inside to the outside, the conductive collimating lens 5 sequentially includes a first lens region 501, a second lens region 503, a third lens region 502 and a fourth lens region 504;

[0084] The second lens region 503 and the fourth lens region 504 are doped with metal particles and are in contact with the corresponding first conductive cladding 202 and second conductive cladding 204;

[0085] The refractive index of the second lens region 503 is less than the refractive index of the first lens region 501; the refractive index of the fourth lens region 504 is less than the refractive index of the third lens region 502.

[0086] In the above structure, the core functions of the first lens region 501 and the third lens region 502 are to adjust the intensity of the incident light, reduce the butt joint loss, and ensure clarity and accuracy. Because when the light is too strong and may cause data distortion, the light-transmitting lens can effectively weaken the light, avoid overexposure, and make the interference fringes more clearly visible; in addition, the design of the refractive indices of the second lens region 503 and the fourth lens region 504 can also avoid the mutual interference problem between the optical signals in the first lens region 501 and the third lens region 502.

[0087] Furthermore, to reduce the butt joint loss and increase the coupling efficiency, the top and bottom of the first lens region 501 and the third lens region 502 are spherical surfaces; or,

[0088] An antireflection film is provided on the top and bottom of the first lens region 501 and the third lens region 502. All of the above are for adjusting the intensity of the incident light and reducing the butt joint loss.

[0089] Furthermore, a transparent lubricant is provided between the second lens region 503 and the fourth lens region 504 and the two optical fibers 2. The refractive index of the lubricant is about 1.50 - 1.6 to reduce the frictional loss during rotation; the lubricant is a conductive lubricant, that is, a conductive polymer lubricant (PEDOT:PSS); the above setting of the lubricant can also be set between the conductive collimating lens 5 and the optical fiber 2.

[0090] Reference Figure 6 , this application also proposes an optoelectronic signal transmission system, which includes:

[0091] A light source and a detector located on the ground; the signal transmitting and monitoring device includes the light source and the detector on the ground;

[0092] A remote detection device, and the optoelectronic transmission structure is connected to the light source and the detector.

[0093] After the optical signal is emitted from the signal transmitting and monitoring device, it sequentially passes through the optical fiber 2 of the stator of the optoelectronic transmission structure, the filtering member, the conductive collimating lens 5, the optical fiber 2 of the rotor, and the optical interface of the remote device.

[0094] Due to its structure, the optical fiber 2 used in the optoelectronic signal transmission system has high integration and small size, and a single optical fiber can transmit both optical and electrical signals; the structure of the optoelectronic slip ring makes the optical path and circuit design simpler. Only one conductive collimating lens is required to complete the optical path alignment. The system allows a larger processing error, lower design difficulty, and lower processing cost; the filtering member prefabricated on the multi-core optical fiber multiplexes and demultiplexes the optical communication signal and the optical sensing signal according to the wavelength. There is no need to set a WDM device outside the light source. Therefore, the optical path design of the light source can be simplified, the wavelength division multiplexing device at the transmitting end can be removed, and the light source can be replaced from a single-wavelength light source with high precision requirements to a white light source, and the overall design cost is lower. The reason for replacing the white light source is that the white light source emits white light (including optical signals of multiple wavelengths), and the filtering member on the end face of the optical fiber 2 of the optoelectronic transmission structure filters the white light to achieve precise screening and transmission of the signals.

[0095] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0096] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of another identical element in the process, method, article or device comprising the said element.

[0097] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A photoelectric transmission structure, characterized in that: It includes: A stator (1) is mounted on a slip ring connection seat (4) and has an optical fiber (2) therein; A rotor (3) is rotatably connected to the slip ring connection seat (4) and is coaxially arranged below the stator (1); an optical fiber (2) is also arranged in the rotor (3); The two optical fibers (2) are coaxially arranged; the top end face of the optical fiber (2) located at the bottom is affixed to the bottom end face of the optical fiber (2) located at the top; and the optical fiber (2) comprises at least a first fiber core (201) and a first conductive cladding (202) concentric with the first fiber core (201).

2. The photoelectric transmission structure according to claim 1, characterized in that: In the radial direction from the inside to the outside of the optical fiber (2), a plurality of photoconductive layers are sequentially arranged outside the first conductive cladding (202); Each of the photoconductive layers comprises a second fiber core (203) and a second conductive cladding (204), both of which are ring-shaped; the second conductive cladding (204) is located outside the second fiber core (203); The first fiber core (201) is a single-mode fiber core; the second fiber core (203) is a multi-mode fiber core.

3. The photoelectric transmission structure according to claim 2, characterized in that: The first conductive cladding (202) and the second conductive cladding (204) both comprise glass claddings; the glass claddings are doped with metal particles; The refractive index of the glass cladding of the first conductive cladding (202) is smaller than the refractive index of the first core (201); The refractive index of the glass cladding of the second conductive cladding (204) is lower than the refractive index of the second core (203).

4. The photoelectric transmission structure according to claim 2, characterized in that: The first conductive cladding (202) and the second conductive cladding (204) both comprise glass claddings; the inner surface or the outer surface of the glass cladding is provided with a metal coating (205); The refractive index of the glass cladding of the first conductive cladding (202) is smaller than the refractive index of the first core (201); The refractive index of the glass cladding of the second conductive cladding (204) is lower than the refractive index of the second core (203).

5. The photoelectric transmission structure according to claim 2, characterized in that: A light filter is prefabricated on at least one of the top end face of the optical fiber (2) located at the bottom and the bottom end face of the optical fiber (2) located at the top; The optical filter is provided with a first optical filtering region and a second optical filtering region corresponding to the first fiber core (201) and the second fiber core (203); the optical filtering wavelength of the first optical filtering region is different from the optical filtering wavelength of the second optical filtering region; The optical filter is provided with a first conductive region and a second conductive region corresponding to the first conductive cladding (202) and the second conductive cladding (204).

6. The photoelectric transmission structure according to claim 2, characterized in that: The slip ring connection seat (4) is also provided with a conductive collimating lens (5) between the top end face of the optical fiber (2) located below and the bottom end face of the optical fiber (2) located above.

7. The photoelectric transmission structure according to claim 6, characterized in that: In the radial direction from inside to outside of the conductive collimating lens (5), the conductive collimating lens (5) comprises in sequence a first lens area (501), a second lens area (503), a third lens area (502) and a fourth lens area (504); The second lens area (503) and the fourth lens area (504) are doped with metal particles and are bonded to the corresponding first conductive cladding layer (202) and the second conductive cladding layer (204); The refractive index of the second lens zone (503) is smaller than the refractive index of the first lens zone (501); and the refractive index of the fourth lens zone (504) is smaller than the refractive index of the third lens zone (502).

8. The photoelectric transmission structure according to claim 7, characterized in that: A transparent lubricant is provided between the second lens area (503) and the fourth lens area (504) and the two optical fibers (2), and the refractive index of the lubricant is approximately 1.50-1.

6.

9. The photoelectric transmission structure according to claim 7, characterized in that: The top and bottom of the first lens area (501) and the third lens area (502) are spherical surfaces; or, Anti-reflection films are provided on the top and bottom of the first lens area (501) and the third lens area (502).

10. A photoelectric signal transmission system, characterized in that: It includes: Light sources and detectors located on the ground; A remote detection device, which is connected to the light source and the detector via the optoelectronic transmission structure as described in any one of claims 1 to 9.

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