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

Abstract

This utility model relates to a multimode single-fiber bidirectional optical device and an automotive optical module, comprising a lens body. The lens body is characterized by having an optical port, lens A, a filter, lens B, a reflector, and lens C. The optical port, lens A, filter, and lens B are located on the same axis on one side of the lens body, while the reflector and lens C are located on the same axis on the other side of the lens body. The filter and reflector are arranged parallel to each other and on the same surface, with their optical paths connected. This utility model provides a low-cost design scheme for a multimode single-fiber bidirectional plastic lens used in COB packaging. The scheme is formed in one mold, enabling low-cost mass production. Furthermore, the scheme has a large tolerance, allowing simultaneous coupling of VCSEL chips and PD chips, reducing the difficulty of automotive optical module packaging and accelerating the industrialization of automotive optical modules.

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 device and a 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] Vehicle-mounted 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, vehicle-mounted 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 plastic lenses 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 device and vehicle-mounted optical module that can be applied to COB packaging, 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 device includes a lens body, characterized in that: the lens body is provided with an optical port, lens A, a filter, lens B, a reflector, and lens C. The optical port, lens A, filter, and lens B are located on the same axis on one side of the lens body, and the reflector and lens C are located on the same axis on the other side of the lens body. The filter and reflector 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 onto the filter. The filter 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 onto the filter. After being reflected by the reflective surface of the filter, it reaches the reflective surface of the reflector. The reflective surface is used to emit the reflected light emitted by the filter onto 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, with the optical aperture and lens A located at the cylindrical structure.

[0007] According to the above technical solution, a window is opened on one side wall of the block structure, and a window is opened on the upper side of the block structure opposite to the light port. A filter and a reflector are respectively installed in the two windows.

[0008] According to the above technical solution, a groove is provided at the bottom of the lens body, and lens B and lens C are set on the bottom groove, respectively corresponding to the filter and the reflector.

[0009] According to the above technical solution, the reflector is made by mold and its refractive index is between 1.6 and 1.8, so there is no need to coat or attach a reflector to its surface.

[0010] According to the above technical solution, the filter is made by mold, and a beam-splitting film is deposited on its surface or a 45° filter is attached.

[0011] According to the above technical solution, the wavelengths of λ1 and λ2 are one of 850nm, 905nm, 910nm, and 980nm, where λ1≠λ2.

[0012] According to the above technical solution, the lateral distance between the filter and the reflector is 0.5~10mm.

[0013] 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 filter is 0.5~5mm, and the distance between filter and lens B is 0.3~3mm.

[0014] According to the above technical solution, the distance between the reflector and the lens C is 0.3~3mm.

[0015] A vehicle-mounted optical module, characterized in that it includes the multimode single-fiber bidirectional optical device as described above.

[0016] The beneficial effects of this invention are as follows: This invention provides a low-cost design scheme for a multimode single-fiber bidirectional plastic lens 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, reducing the difficulty of automotive optical module packaging and accelerating the industrialization of automotive optical modules. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is an optical path diagram of the multimode single-fiber bidirectional optical device provided in the embodiments of this utility model.

[0019] Figure 2 This is a three-dimensional structural diagram of the multimode single-fiber bidirectional optical device provided in the embodiments of this utility model.

[0020] Figure 3 This is a top view of the multimode single-fiber bidirectional optical device provided in the embodiments of this utility model.

[0021] Figure 4 for Figure 3 A sectional view along the AA direction.

[0022] Figure 5 This is a three-dimensional structural diagram of the multimode single-fiber bidirectional optical device provided in the embodiments of this utility model.

[0023] Figure 6 This is a three-dimensional structural diagram of the multimode single-fiber bidirectional optical device provided in the embodiments of this utility model. Detailed Implementation

[0024] 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.

[0025] like Figure 1-4 As shown, this embodiment provides a multimode single-fiber bidirectional optical device, including a lens body 9. The lens body is provided with an optical port 12, a lens A5, a filter 3, a lens B2, a reflector 6, and a lens C7. The optical port 12, lens A5, filter 3, and lens B2 are located on the same axis on one side of the lens body 9. The reflector 6 and lens C7 are located on the same axis on the other side of the lens body 9. The filter 3 and the reflector 6 are arranged in parallel and on the same water surface, 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 filter 3. The filter 3 is used to transmit light with wavelength λ1 and reflect light with wavelength λ2. When it receives parallel light (wavelength λ1) from the lens B2, it transmits it. The transmitted light is focused by the 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 filter 3. After being reflected by the reflective surface of the filter 3, it reaches the reflective surface of the reflector 6. The reflective surface 6 is used to reflect the reflected light emitted by the filter to the lens C7. After being focused by the lens C7, it enters the photosensitive surface of the PD chip 8.

[0026] In this embodiment, as 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 filter 3 that 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 filter 3 and is reflected by a 45-degree reflector 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 filter 3 and reflector 6 is arranged perpendicular to the transmitting and receiving optical paths.

[0027] In this embodiment, as Figure 2As shown, 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. A window 10 is opened on one side wall of the block structure, and a window 11 is opened on the upper end of the block structure opposite to the optical port. A filter 3 and a reflector 6 are respectively placed in the two windows. This arrangement not only makes the structure more compact but also facilitates manufacturing. A groove is provided at the bottom of the lens body, and lenses B2 and C7 are placed 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.

[0028] In this embodiment, the filter 3 and the reflector 6 are typically set at a 45-degree angle, and the lens body 9 is made by injection molding using a special plastic material through a special mold.

[0029] Lenses A5, B2, and C7 are pre-formed on the plastic lens body. The reflector 6 is directly manufactured using a mold. Since the plastic lens body is typically made of PEI with a refractive index between 1.6 and 1.8, light can undergo total internal reflection at a 45-degree angle on its inner surface, eliminating the need for surface coating or attaching a reflector. The filter 3 can also be directly manufactured using a mold, but because it needs to split λ1 and λ2, a beam-splitting film needs to be coated on its surface or a 45-degree filter needs to be attached. Furthermore, the wavelengths of λ1 and λ2 can be 850nm, 905nm, 910nm, 980nm, etc., but λ1 ≠ λ2.

[0030] Example 2: This embodiment has a structure basically the same as that of Embodiment 1, except that: the lateral distance between the filter and the reflector is 0.5~10mm, preferably 5~8mm, and 8mm is selected in this embodiment. The distance between the upper port of the optical port and lens A is 0.1~2mm, preferably 0.5~1mm, and 1mm is selected in this embodiment. The distance between lens A and the filter is 0.5~5mm, preferably 2~4mm, and 4mm is selected in this embodiment. The distance between the filter and lens B is 0.3~3mm, preferably 1~2mm, and 2mm is selected in this embodiment. The distance between the reflector and lens C is 0.3~3mm, preferably 1~2mm, and 2mm is selected in this embodiment.

[0031] 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 device, comprising a lens body, characterized in that: The lens body is provided with an optical port, lens A, a filter, lens B, a reflector, and lens C. The optical port, lens A, filter, and lens B are located on the same axis on one side of the lens body, and the reflector and lens C are located on the same axis on the other side of the lens body. The filter and reflector 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 filter. The filter 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 the light with wavelength λ2 emitted in the multimode fiber into parallel light and emit it onto the filter. After being reflected by the reflective surface of the filter, it reaches the reflective surface of the reflector. The reflective surface is used to emit the reflected light emitted by the filter onto lens C.

2. The multimode single-fiber bidirectional optical device 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 convex cylindrical structure. The optical aperture and lens A are located at the cylindrical structure.

3. The multimode single-fiber bidirectional optical device according to claim 2, characterized in that: A window is opened on one side wall of the block structure, and a window is opened on the upper side of the block structure opposite to the light port. A filter and a reflector are respectively placed in the two windows.

4. The multimode single-fiber bidirectional optical device according to claim 3, 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, corresponding to the filter and the reflector respectively.

5. The multimode single-fiber bidirectional optical device according to claim 1 or 2, characterized in that: The reflector is manufactured using a mold, and its refractive index is between 1.6 and 1.8, so there is no need to coat or attach a reflector to its surface.

6. The multimode single-fiber bidirectional optical device according to claim 1 or 2, characterized in that: The filter is manufactured using a mold, with a beam-splitting film deposited on its surface or a 45° filter attached.

7. The multimode single-fiber bidirectional optical device 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.

8. The multimode single-fiber bidirectional optical device according to claim 1 or 2, characterized in that: The lateral distance between the filter and the reflector is 0.5~10mm.

9. The multimode single-fiber bidirectional optical device 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 filter is 0.5~5mm, and the distance between filter and lens B is 0.3~3mm.

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

11. A vehicle-mounted optical module, characterized in that: Includes the multimode single-fiber bidirectional optical device as described in any one of claims 1 to 10.

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