A multimode single-fiber bidirectional optical assembly and a vehicle-mounted optical module

Abstract

The utility model relates to a kind of multimode single-fiber bidirectional optical assembly and vehicle-mounted optical module, including lens body, it is characterized by: being equipped with light port, lens A, first prism, lens B, second prism and lens C on lens body, the light port, lens A, first prism and lens B are located on the same axis on the side of lens body, the second prism and lens C are located on the same axis on the other side of lens body, the first prism and second prism are parallelly arranged and on the same water surface, and the optical path between the two is communicated.The utility model provides a kind of multimode single-fiber bidirectional optical assembly design scheme applied to COB packaging at low cost, and scheme can be formed by mould once, and batch production at low cost can be realized.In addition, scheme tolerance is big, can realize VCSEL chip and PD chip simultaneous coupling, reduce the difficulty of vehicle-mounted optical module packaging, promote the acceleration industrialization of vehicle-mounted optical module.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle-mounted optical communication technology, and in particular relates to a multimode single-fiber bidirectional optical component vehicle-mounted optical module. Background Technology

[0002] With the development of intelligent vehicles and advanced autonomous driving technologies, intelligent driving systems need to process massive amounts of raw data generated per second by sensors such as cameras and LiDAR in real time. The bandwidth requirement for a single LiDAR sensor is approximately 20Mb-1000Mbps, and the bandwidth requirement for each camera is 500Mb-3500Mbps. Traditional electrical transmission solutions are no longer sufficient to support the combined surge in computing power and data. Compared to electrical transmission, fiber optic communication not only offers higher data transmission rates but also effectively reduces vehicle weight, improves energy efficiency, and reduces the impact of electromagnetic interference on in-vehicle electronic systems.

[0003] Automotive optical communication primarily employs Ethernet and PON technologies. PON technology requires bidirectional transmission over two wavelengths via a single fiber. Current PON technologies mainly use TFF filters to combine and split two single-mode wavelengths. However, automotive optical communication primarily uses multimode wavelength transmission, with typical application wavelengths including 850nm, 905nm, 910nm, and 980nm. While unidirectional and bidirectional applications of multimode wavelengths can be achieved using TO packaging and traditional TFF filters, a lower-cost approach is to use COB packaging. Currently, there are no readily available multimode single-fiber bidirectional optical components suitable for COB packaging. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a multimode single-fiber bidirectional optical component and vehicle-mounted optical module that can realize multimode single-fiber bidirectional transmission, which addresses the shortcomings of the existing technology.

[0005] The technical solution adopted in this utility model is as follows: A multimode single-fiber bidirectional optical component includes a lens body, characterized in that: the lens body is provided with an optical port, lens A, a first prism, lens B, a second prism, and lens C. The optical port, lens A, the first prism, and lens B are located on the same axis on one side of the lens body, and the second prism and lens C are located on the same axis on the other side of the lens body. The first prism and the second prism are arranged parallel to each other and on the same surface, and their optical paths are connected. Lens B is used to convert light with wavelength λ1 emitted by the VCSEL chip into parallel light and emit it to the first prism. The first prism is used to transmit light with wavelength λ1 and reflect light with wavelength λ2. When it receives parallel light from lens B, it transmits the light. The transmitted light is focused by lens A and enters the multimode fiber. Lens A is used to convert light with wavelength λ2 emitted in the multimode fiber into parallel light and emit it to the first prism. After being reflected by the reflecting surface of the first prism, it reaches the reflecting surface of the second prism. The reflecting surface is used to reflect the reflected light emitted by the first prism to lens C.

[0006] According to the above technical solution, the lower end of the lens body is a block structure, and one side of the upper end of the block structure is an upwardly protruding cylindrical structure. The optical aperture and lens A are set at the cylindrical structure. The lens body is provided with two through holes with right-angled trapezoidal cross sections and a square hole communicating with the two right-angled trapezoidal through holes. The first prism and the second prism are respectively set in the two right-angled trapezoidal through holes, and their shapes match the right-angled trapezoidal holes.

[0007] According to the above technical solution, the inclined surfaces of the two right-angled trapezoidal through holes are parallel and opposite to each other.

[0008] According to the above technical solution, both the right-angled trapezoidal holes and the square hole are processed by mold.

[0009] According to the above technical solution, the lengths of the upper and lower bases of the first and second prisms are both smaller than the upper and lower bases of the right-angled trapezoidal hole.

[0010] According to the above technical solution, a groove is provided at the bottom of the lens body, and lens B and lens C are disposed on the bottom groove.

[0011] According to the above technical solution, the refractive index of the first prism is between 1.6 and 1.8, and a film with λ1 transmission and λ2 total reflection is coated on its 45° waist surface.

[0012] According to the above technical solution, a λ2 total internal reflection film is coated on the 45° waist surface of the second prism.

[0013] According to the above technical solution, the wavelengths of λ1 and λ2 are one of 850nm, 905nm, 910nm, and 980nm, where λ1≠λ2.

[0014] According to the above technical solution, the lateral distance between the first prism and the second prism is 0.5~10mm.

[0015] According to the above technical solution, the distance between the upper port of the optical port and lens A is 0.1~2mm, the distance between lens A and the first prism is 0.5~5mm, and the distance between the first prism and lens B is 0.3~3mm.

[0016] According to the above technical solution, the distance between the second prism and the lens C is 0.3~3mm.

[0017] A vehicle-mounted optical module, characterized in that it includes the multimode single-fiber bidirectional optical component described above.

[0018] The beneficial effects of this invention are as follows: This invention provides a low-cost design scheme for multimode single-fiber bidirectional optical components applied to COB packaging. The scheme is formed in one step using a mold, enabling low-cost mass production. Furthermore, the scheme has a large tolerance, allowing simultaneous coupling of VCSEL chips and PD chips to achieve multimode single-fiber bidirectional transmission, reducing the difficulty of automotive optical module packaging and accelerating the industrialization of automotive optical modules. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an optical path diagram of the multimode single-fiber bidirectional optical component provided in the embodiments of this utility model.

[0021] Figure 2 This is a three-dimensional structural diagram of the multimode single-fiber bidirectional optical component provided in the embodiments of this utility model.

[0022] Figure 3 This is a top view of the multimode single-fiber bidirectional optical component provided in the embodiments of this utility model.

[0023] Figure 4 for Figure 3 A sectional view along the AA direction.

[0024] Figure 5 This is a three-dimensional structural diagram of the multimode single-fiber bidirectional optical component provided in the embodiments of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] like Figure 1-5 As shown, this embodiment provides a multimode single-fiber bidirectional optical component, including a lens body 9. The lens body is provided with an optical port 12, a lens A5, a first prism 3, a lens B2, a second prism 6, and a lens C7. The optical port 12, lens A5, first prism 3, and lens B2 are located on the same axis on one side of the lens body 9. The second prism 6 and lens C7 are located on the same axis on the other side of the lens body 9. The first prism 3 and the second prism 6 are arranged in parallel and on the same horizontal plane, and the optical paths between them are connected. The lens B2 is used to convert the light with wavelength λ1 emitted by the VCSEL chip 1 into parallel light and emit it onto the first prism 3. The first prism 3 is used to transmit light with wavelength λ1 and reflect light with wavelength λ2. When it receives parallel light (wavelength λ1) from lens B2, it transmits it. The transmitted light is focused by lens A5 and enters the multimode fiber 4. The lens A5 is used to convert the light with wavelength λ2 emitted in the multimode fiber 4 into parallel light and emit it onto the first prism 3. After being reflected by the reflective surface of the first prism 3, it reaches the reflective surface of the second prism 6. The reflective surface 6 is used to emit the reflected light emitted by the first prism to lens C7. After being focused by lens C7, it enters the photosensitive surface of the PD chip 8.

[0027] like Figure 1 As shown, the transmitting optical path is implemented as follows: Light with wavelength λ1 emitted by VCSEL chip 1 is converted into parallel light by lens B2. The parallel light passes through a 45-degree first prism 3, which transmits λ1 and reflects λ2 (the wavelength of the light received by the PD chip). The transmitted λ1 light then enters lens A5 and is converged by lens A5 into multimode fiber 4. The receiving optical path is implemented as follows: Light with wavelength λ2 emitted by multimode fiber 4 is converted into parallel light by lens A5. The parallel light passes through the first prism 3 and is reflected to the second prism 6 before entering lens C7. The light is converged by lens C7 into the photosensitive surface of PD chip 8. The two optical paths (the transmitting optical path and the receiving optical path) are arranged in parallel, and the optical path between the first prism 3 and the second prism 6 is arranged perpendicular to the transmitting and receiving optical paths.

[0028] In this embodiment, the lower end of the lens body is a block structure, specifically a cuboid structure. One side of the upper end of the block structure is an upward-convex cylindrical structure. The optical port 12 and lens A5 are located at the cylindrical structure. The lens body has two through holes 11 and 12 with right-angled trapezoidal cross-sections and a square hole 10 communicating with the two right-angled trapezoidal through holes. The inclined surfaces of the two right-angled trapezoidal through holes 11 and 12 are parallel and opposite to each other, facing inwards. The first prism 3 and the second prism 6 are respectively located inside the two right-angled trapezoidal through holes, their shapes matching the right-angled trapezoidal holes. This arrangement not only makes the structure more compact but also easier to manufacture. A groove is provided at the bottom of the lens body, and lens B2 and lens C7 are located in the bottom groove. This structure allows for simultaneous coupling of the VCSEL chip and the PD chip, reducing the difficulty of packaging the automotive optical module.

[0029] In this embodiment, both right-angled trapezoidal holes are through holes, and the acute angle on the other leg of the right-angled trapezoid is 45 degrees; the square hole is a semi-through hole, extending to the right-angled face corresponding to the right-angled trapezoidal hole on the right side. Both right-angled trapezoidal holes and the square hole are manufactured using a mold. The plastic lens body is generally made of PEI, with a refractive index between 1.6 and 1.8. In this embodiment, the lens body 9 is manufactured using a special mold and injection molded from a special plastic material.

[0030] The plastic lens requires two prisms, the first and the second, with cross-sections of right trapezoids. The lengths of the upper and lower bases of the first and the second prisms are both less than the upper and lower bases of the right trapezoidal hole. The 45-degree waist surface of the first prism 3 is coated with a film for λ1 transmission and λ2 total reflection, and the 45-degree waist surface of the second prism 6 is coated with a film for λ2 total reflection. The assembly method is as follows: (1) Insert the first prism 3 into the first right trapezoidal hole of the plastic lens body with the right angle side to the right angle side and the hypotenuse side to the hypotenuse side. Note that during the insertion process, the 45-degree surface of the first prism 3 should not contact the 45-degree surface of the right trapezoidal hole to prevent scratches or the introduction of dirt. (2) Apply glue to the upper and lower base surfaces of the first prism 3 and the first right trapezoidal hole 11 where they contact. The glue will flow into the space between the first prism 3 and the first right trapezoidal hole 11 by siphon. (3) Apply glue to the other side of the first right trapezoidal hole 11 in the same way. (4) Rotate the plastic lens so that the face containing the right-angle waist of the first prism 3 faces upward and the face containing the 45-degree waist faces downward, so that the two 45-degree faces of the first prism fit tightly together under the action of gravity. (5) Maintain the state of (4) and cure the adhesive. The assembly method of the second prism is the same as that of the first prism.

[0031] It is particularly important to note that the wavelengths of λ1 and λ2 can be 850nm, 905nm, 910nm, 980nm, etc., but λ1≠λ2.

[0032] Example 2: This embodiment has a structure basically the same as that of Embodiment 1, except that: the lateral distance between the first prism 3 and the second prism 6 is 0.5~10mm, preferably 1~5mm, and 5mm is selected in this embodiment. The distance between the upper port of the optical port 12 and the lens A is 0.1~2mm, preferably 0.5~0.8mm, and 0.7mm is selected in this embodiment. The distance between the lens A5 and the first prism is 0.5~5mm, preferably 3~5mm, and 5mm is selected in this embodiment; the distance between the first prism and the lens B is 0.3~3mm, preferably 2~3mm, and 2mm is selected in this embodiment. The distance between the second prism and the lens C is 0.3~3mm, preferably 0.8~2mm, and 2mm is selected in this embodiment.

[0033] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A multimode single-fiber bidirectional optical component, comprising a lens body, characterized in that: The lens body is provided with an optical port, lens A, a first prism, lens B, a second prism, and lens C. The optical port, lens A, the first prism, and lens B are located on the same axis on one side of the lens body, and the second prism and lens C are located on the same axis on the other side of the lens body. The first prism and the second prism are arranged in parallel and on the same surface, and their optical paths are connected. Lens B is used to convert the light with wavelength λ1 emitted by the VCSEL chip into parallel light and emit it onto the first prism. The first prism is used to transmit the light with wavelength λ1 and reflect the light with wavelength λ2. When it receives the parallel light from the VCSEL lens B, it transmits the light. The transmitted light is focused by lens A and enters the multimode fiber. Lens A is used to convert the light with wavelength λ2 emitted in the multimode fiber into parallel light and emit it onto the first prism. After being reflected by the reflecting surface of the first prism, it reaches the reflecting surface of the second prism. The reflecting surface is used to reflect the reflected light emitted by the first prism to lens C.

2. The multimode single-fiber bidirectional optical component according to claim 1, characterized in that: The lower end of the lens body is a block structure, and one side of the upper end of the block structure is an upwardly protruding cylindrical structure. The optical aperture and lens A are located at the cylindrical structure. The lens body has two through holes with right-angled trapezoidal cross sections and a square hole that communicates with the two right-angled trapezoidal through holes. The first prism and the second prism are respectively located inside the two right-angled trapezoidal through holes, and their shapes match the right-angled trapezoidal holes.

3. The multimode single-fiber bidirectional optical component according to claim 2, characterized in that: The inclined surfaces of the two right-angled trapezoidal through holes are parallel and opposite to each other.

4. The multimode single-fiber bidirectional optical component according to claim 2, characterized in that: Both the right-angled trapezoidal holes and the square hole are machined using molds.

5. The multimode single-fiber bidirectional optical component according to claim 3 or 4, characterized in that: The lengths of the upper and lower bases of the first and second prisms are both smaller than the upper and lower bases of the right-angled trapezoidal hole.

6. The multimode single-fiber bidirectional optical component according to claim 1 or 2, characterized in that: A groove is provided at the bottom of the lens body, and lens B and lens C are set on the bottom groove.

7. The multimode single-fiber bidirectional optical component according to claim 1 or 2, characterized in that: The first prism has a refractive index between 1.6 and 1.8, and its 45° waist surface is coated with a film that allows for λ1 transmission and λ2 total internal reflection.

8. The multimode single-fiber bidirectional optical component according to claim 1 or 2, characterized in that: A λ2 total internal reflection film is coated on the 45° waist surface of the second prism.

9. The multimode single-fiber bidirectional optical component according to claim 1 or 2, characterized in that: The wavelengths of λ1 and λ2 are one of 850nm, 905nm, 910nm, and 980nm, where λ1≠λ2.

10. The multimode single-fiber bidirectional optical component according to claim 1 or 2, characterized in that: The lateral distance between the first prism and the second prism is 0.5~10mm.

11. The multimode single-fiber bidirectional optical component according to claim 1 or 2, characterized in that: The distance between the upper port of the optical port and lens A is 0.1~2mm, the distance between lens A and the first prism is 0.5~5mm, and the distance between the first prism and lens B is 0.3~3mm.

12. The multimode single-fiber bidirectional optical component according to claim 1 or 2, characterized in that: The distance between the second prism and lens C is 0.3~3mm.

13. A vehicle-mounted optical module, characterized in that: Includes the multimode single-fiber bidirectional optical component as described in any one of claims 1-12.

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