Optical fiber communication device

Abstract

The invention relates to the technical field of optical communication equipment, in particular to an optical fiber communication device. Comprising an insertion core assembly and a light-transmitting piece, the insertion core assembly comprises an optical fiber, a capillary tube and a coating layer, the optical fiber penetrates through the capillary tube, and the coating layer wraps the portion, extending out of the capillary tube, of the optical fiber; and the light-transmitting part sleeves the connecting position of the optical fiber extending out of the capillary tube, and is used for transmitting and diffusing the return light or stray light in the insertion core assembly to the outside. The optical environment where the optical fiber extends out of the capillary tube is changed by arranging the light-transmitting part, the light-transmitting part can change the original path of the return light or stray light, the return light or stray light originally focused in the coating layer is transferred and transmitted to the light-transmitting part and diffused outwards, focusing of the stray light is prevented, light energy accumulation in the coating layer is reduced, and the light-transmitting part can change the original path of the return light or stray light. Therefore, the coating layer of the optical fiber is prevented from being degraded and damaged due to high temperature generated by gathering of the return light or stray light, the optical fiber is effectively prevented from being broken, the internal temperature of the insertion core assembly is reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical communication devices, and particularly relates to an optical fiber communication device. BACKGROUND

[0002] With the rapid development of optical fiber communication systems in the direction of high speed, large capacity and long distance, the optical power transmitted by the system is increasing. Under this background, the performance and long-term reliability of various optical fiber communication core devices, such as optical attenuators for accurately controlling optical power, filters for screening specific wavelengths, and optical isolators for ensuring unidirectional transmission of optical paths, are facing new and severe challenges. These devices achieve their specific functions by deflecting, filtering or isolating part of the optical signal, but in the process, high-energy stray light or return light that does not enter the predetermined optical path is inevitably generated. These stray light or return light does not disappear, but rather propagates and accumulates along other paths in the packaging structure inside the device.

[0003] The above-mentioned optical fiber communication devices generally use a ferrule assembly (commonly known as an "optical fiber head") containing an optical fiber, a capillary tube and a protective glue package for optical path connection and alignment. During the operation of the device, stray light is easily coupled into the cladding internal space of the optical fiber (core). Due to the smooth inner wall of the capillary tube, the stray light is conducted forward with low loss, and finally reaches the spherical glue package formed by the solidified glue at the tail of the optical fiber. The geometric shape of the glue package usually has a converging effect on the light, resulting in a high concentration of stray light energy transmitted thereto, forming a local high-temperature focusing point. The high-temperature focusing point is easy to act on the surface of the coating layer of the optical fiber, which has poor heat resistance. Under long-term or high-power working conditions, the coating layer is prone to irreversible damage such as burning due to overheating. Once the coating layer fails, the internal core will lose the key external protection and may break under slight stress, causing permanent interruption of the optical path and overall failure of the device. SUMMARY

[0004] Embodiments of the present application provide an optical fiber communication device to solve the problem of heat damage of the optical fiber caused by the convergence of stray light in the prior art optical fiber communication device.

[0005] The present application discloses an optical fiber communication device, comprising: A ferrule assembly comprising an optical fiber, a capillary tube and a cladding layer, the optical fiber being arranged in the capillary tube, and the portion of the optical fiber extending out of the capillary tube being wrapped with the cladding layer; A light-transmitting piece being sleeved at the connection position of the optical fiber extending out of the capillary tube, the light-transmitting piece being used for transmitting the return light or stray light in the ferrule assembly to continue to diffuse and transmit outward, and preventing total reflection in the capillary tube.

[0006] In an embodiment, the light-transmitting member comprises a head portion, the head portion is arranged around the part of the optical fiber extending out of the capillary tube, and the cladding layer is filled in the head portion.

[0007] In an embodiment, the head portion comprises an end face and an inner surface wall arranged around the end face, the end face is arranged spaced apart from the capillary tube, and an inner chamfer is arranged at the connecting position of the end face and the inner surface wall, the inner chamfer has a gradually expanding trend in the direction away from the capillary tube.

[0008] In an embodiment, the head portion comprises a head end and an extension segment, the head end is connected to the extension segment, and the head end is located at the side of the extension segment away from the capillary tube.

[0009] In an embodiment, the light-transmitting member comprises a body portion, the body portion is sleeved on the capillary tube, and the head portion is connected to the body portion.

[0010] In an embodiment, the light-transmitting member comprises an optical adhesive layer, the optical adhesive layer is arranged between the body portion and the capillary tube.

[0011] In an embodiment, the cladding layer has a curved surface, the curved surface is arranged spaced apart from the capillary tube in the extension direction of the optical fiber, and the curved surface presents a concave shape as a whole.

[0012] In an embodiment, the cladding layer has a refractive index greater than or equal to the refractive index of the capillary tube; and / or the light-transmitting member has a refractive index greater than or equal to the refractive index of the capillary tube.

[0013] In an embodiment, the cladding layer is made of a transparent soft glue having high transmittance to the light transmitted in the optical fiber.

[0014] In an embodiment, the light-transmitting member is a glass tube or a transparent plastic tube or a transparent ceramic.

[0015] The optical fiber communication device provided by the embodiment has the beneficial effect that the light-transmitting member can prevent the optical fiber from being broken due to the influence of stray light, and improves the service life of the optical fiber communication device.

[0016] Specifically, by arranging the light-transmitting member, the optical environment of the position of the optical fiber extending out of the capillary tube is changed, the return light and the stray light originally refracted and gathered in the cladding layer are transferred and transmitted into the light-transmitting member, the light-transmitting member changes the original path of the return light or the stray light, the return light or the stray light originally focused in the cladding layer is transferred and transmitted to the light-transmitting member and diffused outward, the focusing of the stray light is prevented, the accumulation of light energy in the cladding layer is reduced, the degradation and damage of the cladding layer of the optical fiber due to the high temperature caused by the gathering of the return light or the stray light are prevented, the breakage of the optical fiber is effectively prevented, the internal temperature of the ferrule assembly is reduced, and the service life is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The technical solutions of the present application will be further described in detail below with reference to the accompanying drawings and embodiments, in which: Figure 1 is a schematic diagram of the internal optical path of an optical attenuator in the prior art; Figure 2 is a schematic diagram of the internal optical path of an optical attenuator in the prior art; Figure 3 is a schematic diagram of the internal optical path of an optical isolator in the prior art; Figure 4 is a sectional view of an optical fiber communication device according to an embodiment of the present application; Figure 5 is a sectional view of a ferrule assembly and a light-transmitting piece of an optical fiber communication device according to an embodiment of the present application; Figure 6 is a sectional view of a ferrule assembly, a cladding layer and a light-transmitting piece of an optical fiber communication device according to an embodiment of the present application; Figure 7 is a schematic diagram of the internal optical path of an optical attenuator according to an embodiment of the present application.

[0018] The reference signs in the drawings are as follows: 1000, optical fiber communication device; 10, ferrule assembly; 11, optical fiber; 12, capillary tube; 13, cladding layer; 131, arc surface; 20, light-transmitting piece; 21, head portion; 211, end surface; 212, inner chamfer; 213, head end; 214, extension section; 22, body portion; 23, optical glue layer. DETAILED DESCRIPTION

[0019] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0020] Optical fiber communication devices have specific optical signal processing capabilities, such as attenuators for controlling optical power, filters for screening specific wavelengths, and isolators for blocking reverse transmission light. These devices will all generate stray light or return light, i.e. optical signals that are attenuated, filtered or isolated, during operation. These stray light usually does not completely disappear, but continues to propagate along other paths inside the device. With the development of optical fiber communication systems towards higher power, the energy carried by the stray light is also increasing. In many cases, these stray lights may converge together to form a region with high energy concentration.

[0021] Such fiber-optic communication devices usually contain a ferrule assembly (i.e. fiber head) for optical path connection. The fiber head is generally composed of an optical fiber and a capillary tube, the optical fiber is arranged in the capillary tube, and the end portion of the optical fiber extending out of the capillary tube is usually wrapped by a glue package, which is usually spherical. When stray light enters the fiber head, due to the continuous diffusion of the light beam and the total reflection effect of the inner wall of the capillary tube, the optical energy will eventually converge into a high-energy focus point inside or near the glue package. The hot spot is often just on the coating layer of the optical fiber. The main material of the coating layer is acrylate, which has a decomposition temperature of only about 200°C and is prone to degradation and damage at high temperatures. Once the coating layer fails, the unprotected fiber core is easily broken, causing the entire optical path to be interrupted, which poses a serious risk to the system.

[0022] To more clearly illustrate the occurrence principle of the above common problems, the following takes an optical attenuator and an optical isolator as examples for specific description. Taking the optical attenuator as an example, referring to Figure 1 and Figure 2 , the optical attenuator mainly contains an optical attenuation processing unit (as shown by A in Figure 1 ), a collimating lens (as shown by B in Figure 1 ), and a double-fiber fiber head (as shown by C in Figure 3 ). The basic working principle is that the light beam emitted from the input optical fiber in the double-fiber fiber head is collimated by the lens and then incident to the optical attenuation processing unit, and after being reflected by the optical attenuation processing unit, the light beam is coupled back to the output optical fiber by the lens. By controlling the optical attenuation processing unit (such as changing the angle of the reflecting mirror or using an attenuation sheet), a small angle deflection of part of the light beam can be achieved. This part of the deflected light deviates from the optimal coupling light path and cannot enter the core of the output optical fiber efficiently, thereby achieving optical power attenuation. However, these attenuated stray lights do not disappear. They enter the capillary cladding region of the double-fiber fiber head at a small deflection angle, and their spot energy is approximately Gaussian distributed, and starts to spread along the tail fiber direction of the double-fiber fiber head. Due to the small deflection angle, the stray light is easy to continuously transmit forward in the smooth capillary glass wall until it reaches the glue package at the tail of the double-fiber fiber head. The nearly spherical structure of the glue package has a converging effect on the light. Therefore, the stray light transmitted for a long distance is focused into a high-energy density spot at the glue package, and the focal point falls on the surface of the coating layer of the input and output optical fibers. The main component of the coating layer is acrylate, which has poor temperature resistance and a thermal degradation threshold of about 220°C. Under the continuous irradiation of high-energy density, the coating layer is prone to thermal degradation or even burning. Once the coating layer is damaged, the fiber core will lose the key external protection, and its structural strength will be greatly reduced, and it will be easily broken under a small stress, thereby causing permanent interruption of the optical path and complete failure of the device.

[0023] Taking the optical isolator as an example, referring to Figure 3 , the optical isolator mainly contains a Faraday rotating assembly (as shown by D in Figure 3 ), a first fiber head (as shown by E in Figure 3(as shown in E in the diagram), the second fiber optic head (as shown in the diagram) Figure 3 (as shown in F in the image) and collimating lenses (such as...) Figure 3 As shown in G), the beam emitted from the first fiber optic head passes through the first collimating lens to the Faraday rotation assembly, and then through the second collimating lens into the second fiber optic head for forward transmission. The isolation principle is as follows: when the returning light attempts to return from the output end, the Faraday rotation assembly rotates its polarization state by a specific angle. The returning light is then split into two positively polarized beams, P and O, which are deflected outwards at a certain angle, preventing coupling back to the core of the first fiber optic head at the input end, thus achieving reverse isolation. However, these deflected and isolated returning beams are not absorbed. They enter the capillary cladding or free space of the first fiber optic head and continue to propagate forward after multiple reflections through the capillary wall, finally converging at the end of the first fiber optic head. Similarly, under high-power operating conditions, this convergence point forms a high-energy-density light spot that directly illuminates the coating layer of the input fiber. Similar to the optical attenuator case, the acrylate coating material faces the risk of thermal degradation at a threshold of approximately 200°C. Once the coating layer carbonizes and is damaged due to overheating, the internal fiber core loses its mechanical protection and is very prone to breakage under stress, ultimately leading to optical path interruption and permanent device failure.

[0024] To address the aforementioned technical problems, embodiments of the present invention provide an optical fiber communication device 1000, such as... Figure 4 As shown, the optical fiber communication device 1000 includes a ferrule assembly 10 and a light-transmitting element 20. The ferrule assembly 10 includes an optical fiber 11, a capillary tube 12, and a cladding layer 13. The optical fiber 11 passes through the capillary tube 12, and the portion of the optical fiber 11 extending out of the capillary tube 12 is covered by the cladding layer 13. The light-transmitting element 20 is fitted at the connection position where the optical fiber 11 extends out of the capillary tube 12. The light-transmitting element 20 is used to transmit and diffuse the reflected light or stray light in the ferrule assembly 10 to continue to diffuse outward and prevent total internal reflection within the capillary tube 12. By providing the light-transmitting element 20, this application can prevent the optical fiber 11 from breaking due to stray light, thereby improving the service life of the optical fiber communication device 1000.

[0025] Specifically, by setting the light-transmitting piece 20, the optical environment of the position where the optical fiber 11 extends out of the capillary tube 12 is changed, the return light and stray light originally refracted and gathered in the cladding layer 13 are transferred and transmitted into the light-transmitting piece 20, the light-transmitting piece 20 changes the original path of the return light or stray light, the return light or stray light originally focused in the cladding layer 13 is transferred and transmitted to itself and diffused outward, the focusing of stray light is prevented, the accumulation of light energy in the cladding layer 13 is reduced, thereby preventing the degradation and damage of the coating of the optical fiber 11 due to the accumulation of return light or stray light, effectively preventing the breakage of the optical fiber 11, reducing the internal temperature of the ferrule assembly 10, and prolonging the service life. Moreover, compared with the embodiments of manufacturing a cladding light stripping structure on the optical fiber 11 or externally connecting a cladding light stripper, the present application does not need to process or adjust the ferrule assembly 10 itself, and only needs to add the light-transmitting piece 20 outside the existing ferrule assembly 10, which is simple to manufacture and has lower cost.

[0026] It should be noted that for the problem of optical fiber thermal damage caused by the convergence of stray light, there are mainly two types of solutions in the prior art. The first type of solution is to process a special attenuation coating or microstructure on the optical fiber cladding, which aims to force the stray light in the optical fiber cladding to leak out of the optical fiber. However, this method must change the structure or coating of the optical fiber itself, which is complex in process and requires high precision, and may introduce additional insertion loss or reliability risks, making it difficult to be widely used in conventional device manufacturing. The second type of solution is to directly use a high-temperature-resistant optical fiber, whose coating layer usually uses a high-temperature material such as polyimide, and the thermal degradation temperature can exceed 300°C. However, the price of such special optical fiber is usually several or even dozens of times that of conventional acrylate-coated optical fiber, which will greatly increase the cost of the device and is difficult to popularize. In contrast, the technical solution provided by the present application does not need to change the structure or material of the optical fiber 11 itself, nor does it need to use expensive special optical fiber. Based on the existing mature ferrule assembly 10 structure, the light-transmitting piece 20 is added to achieve efficient guidance and dissipation of stray light. This solution is simple in manufacturing process, has strong compatibility with existing production lines, and has significantly lower cost than the above two types of existing solutions. While ensuring high reliability, it has excellent practicality and economy, and is suitable for large-scale application.

[0027] In the present application, the number of optical fibers 11 can be freely adjusted by those skilled in the art according to the needs, which is not limited herein. In the present application, two optical fibers 11 are provided, which are input optical fiber 11 and output optical fiber 11 respectively.

[0028] Reference Figure 4In one embodiment, the light-transmitting element 20 includes a head 21, which surrounds the portion of the optical fiber 11 extending out of the capillary 12, and a cladding layer 13 fills the head 21. Thus, the head 21 accurately receives reflected and stray light from the ferrule assembly 10 to the outer surface of the cladding layer 13, and its surrounding arrangement of the optical fiber 11 ensures that the reflected and stray light diffuses to the outside through the light-transmitting element 20. Furthermore, the cladding layer 13 filling the head 21 means there is no gap between them, thereby minimizing energy loss of reflected and stray light during their journey from the cladding layer 13 to the light-transmitting element 20, ensuring that reflected and stray light can be efficiently guided into the light-transmitting element 20. The shape of the head 21 can be freely adjusted according to requirements; in this embodiment, the head 21 is a hollow cylinder.

[0029] Reference Figure 5 In a specific embodiment, the head 21 includes an end face 211 and an inner wall surrounding the end face 211. The end face 211 is spaced apart from the capillary tube 12. An inner chamfer 212 is provided at the connection between the inner wall and the end face 211. The inner chamfer 212 has a gradually expanding tendency in the direction away from the capillary tube 12. Thus, when the reflected light and stray light reach the inclined surface of the inner chamfer 212, since the inclined surface of the inner chamfer 212 extends outward from the central axis away from the fiber optic 11, it can change the optical path direction of the reflected light and stray light, causing the reflected light and stray light to be refracted, and the emission direction of the reflected light and stray light (e.g., Figure 5 As shown in L1, the light is emitted radially away from the center axis of the optical fiber 11, which enhances the diffusion and scattering capability of the light-transmitting element 20. This not only changes the transmission path of the reflected light and stray light, but also guides and diffuses them more actively and efficiently, further reducing the probability of energy accumulation of the reflected light and stray light at the ferrule assembly 10.

[0030] Specifically, the inner chamfer 212 is arranged around the optical fiber 11, and the shape of the connection position between the inner surface wall and the end face 211 is trumpet-shaped.

[0031] Reference Figure 5 In one embodiment, the head 21 includes a head end 213 and an extension 214. The head end 213 is connected to the extension 214, and the head end 213 is located on the side of the extension 214 away from the capillary 12. Thus, the extension 214 increases the contact range between the head 21 and the covering layer 13, ensuring that reflected light and stray light from the ferrule assembly 10 to the outer surface of the covering layer 13 can be sufficiently guided to the head 21. Furthermore, the extension 214 can guide the reflected light and stray light to the head 21, causing the reflected light and stray light to diffuse and scatter. Specifically, an inner chamfer 212 is provided at the head end 213, and the extension 214 is also a hollow cylinder.

[0032] Reference Figure 4In one embodiment, the light-transmitting element 20 includes a body 22, which is sleeved on the capillary tube 12, and a head 21 is connected to the body 22. Thus, firstly, the body 22 allows the light-transmitting element 20 to be fixed to the insert assembly 10, improving the reliability of the connection and preventing the light-transmitting element 20 from becoming loose and affecting the scattering effect on reflected and stray light; secondly, the body 22 extends the optical range of the light-transmitting element 20 to the capillary tube 12, the head 21 guides reflected and stray light escaping from the cladding layer 13, and the body 22 directly conducts reflected and stray light propagating within the glass wall of the capillary tube 12 or refracted by its surface, guiding the reflected and stray light to the head 21, eliminating light energy accumulation in the capillary tube 12; thirdly, some reflected or stray light may propagate within the wall of the capillary tube 12 or cause localized heating of the capillary tube 12. The body 22 can more effectively conduct light or heat energy conducted to the surface of the capillary 12 to the light-transmitting element 20 with a larger heat dissipation area, thereby reducing the operating temperature of key parts of the ferrule assembly 10.

[0033] In one embodiment, the body 22 and the head 21 are integrated to facilitate the installation of the light-transmitting element 20.

[0034] Reference Figure 4 and Figure 5 In one embodiment, the light-transmitting element 20 includes an optical adhesive layer 23 disposed between the body 22 and the capillary 12. Thus, the light-transmitting element 20 and the capillary 12 can be bonded together through the optical adhesive layer 23, allowing the light-transmitting element 20 to be tightly fitted with the capillary 12, reducing the gap between them and ensuring the transmission of reflected or stray light. Furthermore, the optical adhesive layer 23 allows reflected and stray light from the insert assembly 10 to the corresponding positions of the capillary 12 and the body 22 to be fully transmitted into the light-transmitting element 20, preventing total internal reflection of reflected and stray light at the interface of the capillary 12.

[0035] Reference Figure 6 In one embodiment, the cladding layer 13 has an arcuate surface 131. Along the extension direction of the optical fiber 11, the arcuate surface 131 is spaced apart from the capillary tube 12, and the arcuate surface 131 is concave towards the capillary tube 12. Specifically, the arcuate surface 131 has an overall concave shape towards the capillary tube 12. Thus, the concavity of the arcuate surface 131 towards the capillary tube 12 causes the cladding layer 13 to exhibit a concave lens effect. When some of the reflected light and stray light reach the arcuate surface 131, the concave lens effect of the arcuate surface 131 allows the reflected light and stray light to continue to diverge (e.g., ...). Figure 5 As shown in L2), this reduces the convergence of return light and stray light within the cladding layer and near the fiber 11, effectively preventing the beam from converging within the cladding layer 13 or near the fiber 11, and further avoiding the high temperature generated by beam convergence that could cause the fiber 11 to degrade and be damaged.

[0036] In one embodiment, the refractive index of the light-transmitting element 20 is greater than or equal to the refractive index of the capillary 12. This is to prevent total internal reflection of reflected light and stray light at the interface of the capillary 12. Specifically, the refractive index of the light-transmitting element 20 is slightly greater than or equal to the refractive index of the capillary 12.

[0037] Furthermore, the refractive index of the cladding layer 13 is greater than or equal to the refractive index of the capillary 12. Thus, when a portion of the reflected and stray light from within the capillary 12 reaches the cladding layer 13, reflection is less likely. The reflected and stray light can be transmitted through the cladding layer 13 to the light-transmitting element 20 and then to the outside. Furthermore, after a portion of the reflected and stray light converges on the arc surface 131 of the cladding layer 13, the arc surface 131 can change the emission direction of this portion of the reflected and stray light, causing it to deviate from the central axis of the optical fiber 11 in the radial direction, thus achieving a scattering effect and reducing convergence within the cladding layer 13. Specifically, the refractive index of the cladding layer 13 is slightly greater than or equal to the refractive index of the capillary 12; the refractive index of the cladding layer 13 is between 1.4 and 1.7.

[0038] In one embodiment, the cladding layer 13 is made of a transparent soft adhesive with high transmittance to light transmitted in the optical fiber. The transparent soft adhesive can be a thermosetting adhesive, a UV-curing adhesive, silicone, etc., and its transmittance is greater than 85% to accommodate light wavelengths of 800-1700 nm. Furthermore, choosing a transparent soft adhesive also provides cushioning during optical fiber handling, preventing damage to the fiber.

[0039] In one embodiment, the light-transmitting element 20 is a glass tube, a transparent plastic tube, or a transparent ceramic, etc. In this embodiment, the light-transmitting element 20 is a glass tube, the material of which is borosilicate, etc., and the refractive index of the glass tube is close to or slightly higher than that of the capillary tube 12 to avoid total internal reflection.

[0040] To better understand the working principle of this application, we will take this application as an optical attenuator as an example, and refer to... Figure 7 An optical attenuator mainly includes an optical attenuation processing unit (such as...). Figure 7 (as shown by H in the diagram), collimating lens (such as...) Figure 7 (As shown in Figure I), ferrule assembly 10 and light-transmitting element 20. The ferrule assembly 10 includes two optical fibers 11 and a capillary tube 12. The light beam emitted from the input fiber 11 of the two optical fibers 11 is collimated by a lens and then incident on the optical attenuation processing unit. After reflection, it is coupled back to the output fiber 11 of the two optical fibers 11 by the lens. The attenuated stray light diffuses along the pigtail direction of the ferrule assembly 10. Some of the stray light is transmitted through the capillary tube 12 to the head 21 of the light-transmitting element 20. The chamfer 212 inside the head 21 of the light-transmitting element 20 causes the stray light to diffuse and scatter outwards (e.g., ...). Figure 7As shown in L3), a portion of the stray light will be transmitted through the capillary tube to the cladding layer 13. Because the curved surface 131 of the cladding layer 13 has a concave lens effect, this portion of the stray light (such as...) is... Figure 7 As shown in L4, it also diffuses and scatters outward, thereby reducing the accumulation of stray light energy at the cladding layer 13 and preventing the light energy accumulation from contacting the coating layer on the surface of the nearby optical fiber 11, which would cause the coating layer to degrade and be damaged. This ensures that the optical fiber 11 is not easily broken and effectively reduces the internal temperature of the optical attenuator at this point, thus extending its service life.

[0041] It should be noted that this application is not only applicable to optical fiber communication devices 1000 with specific optical signal processing capabilities, but can also be made separately as optical fiber connectors for connecting various optical fiber communication devices, which can effectively extend the service life of the entire optical fiber communication system.

[0042] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. An optical fiber communication device, characterized in that, include: A ferrule assembly includes an optical fiber, a capillary tube, and a cladding layer, wherein the optical fiber passes through the capillary tube and the portion of the optical fiber extending out of the capillary tube is covered with the cladding layer. A light-transmitting element is sleeved at the connection position where the optical fiber extends out of the capillary tube. The light-transmitting element is used to transmit the reflected light or stray light in the ferrule assembly to continue to diffuse outward and prevent total internal reflection in the capillary tube.

2. The optical fiber communication device according to claim 1, characterized in that, The light-transmitting element includes a head, which is disposed around the portion of the optical fiber that extends out of the capillary, and the cladding layer is filled in the head.

3. The optical fiber communication device according to claim 2, characterized in that, The head includes an end face and an inner wall surrounding the end face. The end face is spaced apart from the capillary. The inner wall is provided with an inner chamfer at the connection position with the end face. The inner chamfer has a gradually expanding trend in the direction away from the capillary.

4. The optical fiber communication device according to claim 3, characterized in that, The head includes a head end and an extension, the head end being connected to the extension and located on the side of the extension away from the capillary.

5. The optical fiber communication device according to claim 2, characterized in that, The light-transmitting element includes a body, which is sleeved on the capillary tube, and the head is connected to the body.

6. The optical fiber communication device according to claim 5, characterized in that, The light-transmitting element includes an optical adhesive layer, which is disposed between the body and the capillary.

7. The optical fiber communication device according to any one of claims 1-6, characterized in that, The cladding layer has an arc surface, which is spaced apart from the capillary tube in the extension direction of the optical fiber, and the arc surface is concave in the overall shape towards the capillary tube.

8. The optical fiber communication device according to claim 7, characterized in that, The refractive index of the coating layer is greater than or equal to the refractive index of the capillary; the refractive index of the light-transmitting element is greater than or equal to the refractive index of the capillary.

9. The optical fiber communication device according to claim 7, characterized in that, The cladding layer is made of a transparent soft adhesive with high transmittance to light transmitted in the optical fiber.

10. The optical fiber communication device according to any one of claims 1-6, characterized in that, The light-transmitting component is a glass tube, a transparent plastic tube, or a transparent ceramic.

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