Multi-mode lens compatible with optical chips with different thicknesses and multi-mode optical module

By filling or not filling the first air cavity of the multimode lens with high refractive index glue and adjusting the coupling relationship of the lens array, the problem of developing two sets of molds for optical chips of different thicknesses in the prior art is solved, and the 200um and Compatibility of 150um thickness optical chips reduces production costs and lens unit price.

CN222232730UActive Publication Date: 2024-12-24武汉钧恒科技有限公司
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Patent Information

Application Number
CN202421130621.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-21
Publication Date
2024-12-24
Estimated Expiration
2034-05-21

AI Technical Summary

Technical Problem

The prior art requires the development of two sets of molds and lenses for optical chips of 200um and 150um thickness, resulting in high production costs and expensive unit prices, especially when each lens is small in size.

Method used

Design a multimode lens compatible with optical chips of different thicknesses, using PEI plastic matrix, adjust the coupling of the lens array by filling or not filling the first air cavity of the multimode lens with a refractive index of 1.6 to 1.65 The relationship enables it to be adapted to optical chips with a thickness of 200um and 150um, and only one set of molds is required to produce.

Benefits of technology

Compatibility with 200um and 150um thickness optical chips is achieved, reducing production costs, reducing lens unit price, and maintaining the position stability of optical chips and electric chips.

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Abstract

The utility model relates to a multimode lens compatible with optical chips with different thicknesses, which comprises a base body made of PE (polyethylene) I plastic, a first air cavity and a second air cavity are arranged on the base body, a wall surface of the second air cavity, close to the first air cavity, is provided with a second total reflection surface inclined by 45 degrees, and the second total reflection surface is provided with a third total reflection surface inclined by 45 degrees. The wall face, away from the second air cavity, of the first air cavity is provided with a first fully-reflecting face parallel to the second fully-reflecting face. The chip side of the substrate is provided with a first lens array and a second lens array which are respectively coupled with the first total reflection surface and the second total reflection surface, and the second lens array deviates downwards by 50 microns compared with the first lens array; and the first air cavity is filled with or not filled with high-refractive-index glue with the refractive index of 1.6-1.65. The multi-mode lens has the beneficial effects that the multi-mode lens can be adaptive to an optical chip with the thickness of 200 microns and also can be adaptive to an optical chip with the thickness of 150 microns, so that only one set of mold is required to be opened to produce one lens, the mold opening cost is effectively reduced, and the unit price of the lens is reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of optical modules, and in particular to a multi-mode lens and a multi-mode optical module that are compatible with optical chips of different thicknesses. Background Art

[0002] In the early days, the thickness of low-speed multi-mode optical chips (Vcse l and PD) was mostly 150um. Currently, the mainstream thickness of high-speed multi-mode optical chips (Vcse l and PD) is 200um, and only a few manufacturers use 150um. In order to use optical chips with thicknesses of 200um and 150um, the current solution is to open two sets of molds and produce two types of lenses. Opening two sets of molds and producing two types of lenses will incur expensive costs. When the quantity of each lens decreases, the unit price of the lens will be high. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a multi-mode lens and a multi-mode optical module compatible with optical chips of different thicknesses, so as to overcome the deficiencies in the above-mentioned prior art.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a multi-mode lens compatible with optical chips of different thicknesses, comprising: a substrate made of PEI plastic, a first air cavity and a second air cavity with the lower end in a parallel optical path being sequentially provided on the substrate in a direction away from the optical fiber side thereof, the second air cavity having a wall surface close to the first air cavity having a second total reflection surface inclined at 45°, and the first air cavity having a wall surface away from the second air cavity having a first total reflection surface parallel to the second total reflection surface; a first lens array and a second lens array respectively coupled to the first total reflection surface and the second total reflection surface are provided on the substrate chip side, the second lens array being offset downward by 50um than the first lens array; and the first air cavity being filled or not filled with a high refractive index glue with a refractive index of 1.6 to 1.65.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows.

[0006] Further, the refractive index of PE I plastic is 1.64.

[0007] Furthermore, the refractive index of the high refractive index glue is 1.64.

[0008] Based on the above technical solution, the utility model also provides a multi-mode optical module, including a multi-mode lens, the first air cavity of the multi-mode lens is not filled with high-refractive index glue with a refractive index of 1.6 to 1.65, the multi-mode lens is fixed on a PCB board, a 200 mm thick optical chip is arranged in the multi-mode lens coverage area on the PCB board, the optical chip is coupled to the first lens array, and an optical fiber coupled to the first total reflection surface is arranged on the optical fiber side of the multi-mode lens.

[0009] Based on the above technical solution, the utility model also provides a multi-mode optical module, including a multi-mode lens, the first air cavity of the multi-mode lens is filled with high-refractive index glue with a refractive index of 1.6 to 1.65, the multi-mode lens is fixed on a PCB board, a 150 mm thick optical chip is arranged in the multi-mode lens coverage area on the PCB board, the optical chip is coupled to the second lens array, and an optical fiber coupled to the first total reflection surface is arranged on the optical fiber side of the multi-mode lens.

[0010] The beneficial effects of the utility model are:

[0011] If the first air cavity is not filled with high-refractive-index glue with a refractive index of 1.6 to 1.65, at this time, the first air cavity is filled with air, the first lens array of the multimode lens is coupled to the 200um-thick optical chip, and the second lens array is not coupled, and the light beam emitted by the optical chip is emitted to the first total reflection surface through the first lens array, and then horizontally reflected by the first total reflection surface to the lens array on the side of the base optical fiber;

[0012] If the first air cavity is filled with high-refractive-index glue with a refractive index of 1.6 to 1.65, the second lens array of the multimode lens is coupled to the 150um-thick optical chip, and the first lens array is not coupled, the light beam emitted by the optical chip is emitted to the second total reflection surface through the second lens array, and is horizontally reflected to the first air cavity through the second total reflection surface. Since in PE I plastic: si n45°×(1.6 to 1.65)=1.13 to 1.16, and in the high-refractive-index glue: si n90°×(1.6 to 1.65)=1.6 to 1.65, which is larger than 1.13 to 1.16, the high-refractive-index glue in the first air cavity will destroy the total reflection condition of the first total reflection surface, so that the light cannot be reflected to the first lens array through the first total reflection surface, but is transmitted to the lens array on the side of the matrix optical fiber through the first total reflection surface;

[0013] By filling the first air cavity with high-refractive-index glue with a refractive index of 1.6 to 1.65, the multi-mode lens can be adapted to both optical chips with a thickness of 200um and optical chips with a thickness of 150um, that is, it can be compatible with optical chips of two thicknesses. Therefore, only one set of molds is needed to produce one lens, which effectively reduces the mold opening cost and the unit price of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The structure of the multi-mode lens compatible with optical chips of different thicknesses without filling high refractive index glue in the utility model;

[0015] Figure 2 The structure of the multi-mode lens filled with high refractive index glue and compatible with optical chips of different thicknesses in the utility model;

[0016] Figure 3This is a structural diagram of a multi-mode optical module using a 200um thick optical chip in the present utility model;

[0017] Figure 4 This is a structural diagram of a multi-mode optical module using a 150um thick optical chip in the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. Multimode lens, 110. Base, 120. First air cavity, 121. First total reflection surface, 130. Second air cavity, 131. Second total reflection surface, 140. First lens array, 150. Second lens array, 160. High refractive index glue, 2. PCB board, 3. Optical chip, 4. Optical fiber. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0021] Example 1

[0022] A multimode lens compatible with optical chips of different thicknesses, comprising: a substrate 110 made of PE I plastic, wherein the refractive index of PE I plastic in the prior art is 1.6-1.65, a first air cavity 120 and a second air cavity 130 are sequentially provided on the substrate 110 in a direction away from the optical fiber side thereof, wherein the lower end of the first air cavity 120 and the second air cavity 130 are located in a parallel optical path, wherein the first air cavity 120 is close to the optical fiber side of the substrate 110, and the second air cavity 130 is located on a side of the first air cavity 120 away from the optical fiber side of the substrate 110;

[0023] The wall of the second air cavity 130 close to the first air cavity 120 has a second total reflection surface 131 inclined at 45°, and the wall of the first air cavity 120 far from the second air cavity 130 has a first total reflection surface 121 parallel to the second total reflection surface 131, that is, the first total reflection surface 121 is also inclined at 45°;

[0024] The chip side of the substrate 110 has a first lens array 140 coupled to the first total reflection surface 121, and the chip side of the substrate 110 has a second lens array 150 coupled to the second total reflection surface 131. The second lens array 150 is used to couple the optical chip 3 with a thickness of 150um, and the first lens array 140 is used to couple the optical chip 3 with a thickness of 200um. The difference in thickness between the two is 50um, so the second lens array 150 is offset downward by 50um compared to the first lens array 140.

[0025] In order to adapt to two optical chips 3 of different thicknesses, there are two situations for whether the first air cavity 120 is filled with glue:

[0026] 1) The first air cavity 120 is filled with a high refractive index glue 160 with a refractive index of 1.6 to 1.65;

[0027] 2) The first air cavity 120 is not filled with the high refractive index glue 160 with a refractive index of 1.6 to 1.65;

[0028] like Figure 1 As shown, for the first case: the first air cavity 120 is not filled with the high refractive index glue 160 with a refractive index of 1.6 to 1.65. At this time, the first air cavity 120 is filled with air, the first lens array 140 of the multimode lens 1 is coupled to the 200um thick optical chip 3, and the second lens array 150 is not coupled; the light beam emitted by the optical chip 3 is emitted to the first total reflection surface 121 through the first lens array 140, and then horizontally reflected to the lens array on the optical fiber side of the substrate 110 through the first total reflection surface 121;

[0029] like Figure 2 As shown, for the second case: the first air cavity 120 is filled with a high refractive index glue 160 with a refractive index of 1.6 to 1.65, the second lens array 150 of the multimode lens 1 is coupled to the 150um thick optical chip 3, and the first lens array 140 is not coupled;

[0030] The light beam emitted by the optical chip 3 is emitted toward the second total reflection surface 131 through the second lens array 150 , and is horizontally reflected toward the first air cavity 120 through the second total reflection surface 131 ;

[0031] In PE I plastic: si n45°×(1.6~1.65)=1.13~1.16, while in high refractive index glue: si n90°×(1.6~1.65)=1.6~1.65, which is larger than 1.13~1.16, so the high refractive index glue 160 in the first air cavity 120 will destroy the total reflection condition of the first total reflection surface 121, so that the light cannot be reflected to the first lens array 140 through the first total reflection surface 121, but is transmitted to the lens array on the optical fiber side of the substrate 110 through the first total reflection surface 121;

[0032] By filling the first air cavity 120 with a high refractive index glue 160 with a refractive index of 1.6 to 1.65, the multi-mode lens can be adapted to both optical chips with a thickness of 200um and optical chips with a thickness of 150um, that is, it can be compatible with optical chips of two thicknesses. Therefore, only one set of molds is needed to produce one lens, which effectively reduces the mold opening cost and the unit price of the lens. The positions of the optical chip and the electrical chip can remain unchanged, and the multi-mode lens only needs to be moved a small distance along the parallel optical path direction, where the distance is the spacing value between the first lens array 140 and the second lens array 150.

[0033] Example 2

[0034] like Figure 1 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:

[0035] The refractive index of the PE I plastic is preferably 1.64, and the refractive index of the high refractive index glue 160 is preferably 1.64.

[0036] Example 3

[0037] like Figure 3 As shown, a multimode optical module includes a multimode lens 1 as described in Example 1 or 2, the first air cavity 120 of the multimode lens 1 is not filled with a high refractive index glue 160 with a refractive index of 1.6 to 1.65, the multimode lens 1 is fixed on a PCB board 2, a 200 mm thick optical chip 3 is arranged on the PCB board 2 in the coverage area of ​​the multimode lens 1, the optical chip 3 is coupled to the first lens array 140, an optical fiber 4 coupled to the first total reflection surface 121 is arranged on the optical fiber side of the multimode lens 1, and the light beam emitted by the optical chip 3 is emitted to the first total reflection surface 121 through the first lens array 140, and then horizontally reflected to the optical fiber 4 on the optical fiber side of the substrate 110 through the first total reflection surface 121.

[0038] Example 4

[0039] like Figure 4 As shown, a multimode optical module comprises a multimode lens 1 as described in Example 1 or 2, a first air cavity 120 of the multimode lens 1 is filled with a high refractive index glue 160 with a refractive index of 1.6 to 1.65, the multimode lens 1 is fixed on a PCB board 2, a 150 mm thick optical chip 3 is arranged on the PCB board 2 in the coverage area of ​​the multimode lens 1, the optical chip 3 is coupled to the second lens array 150, an optical fiber 4 coupled to the first total reflection surface 121 is arranged on the optical fiber side of the multimode lens 1, the light beam emitted by the optical chip 3 is emitted to the second total reflection surface 131 through the second lens array 150, and is horizontally reflected to the first air cavity 120 through the second total reflection surface 131, and in the PE I plastic: si n45°×(1.6 to 1.65)=1.13 to 1.16, and in the high refractive index glue: si n90°×(1.6~1.65)=1.6~1.65, which is larger than 1.13~1.16. Therefore, the high refractive index glue 160 in the first air cavity 120 will destroy the total reflection condition of the first total reflection surface 121, so that the light cannot be reflected toward the first lens array 140 through the first total reflection surface 121, but is transmitted through the first total reflection surface 121 into the optical fiber 4 on the optical fiber side of the substrate 110.

[0040] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multi-mode lens compatible with optical chips of different thicknesses, characterized in that: include: A substrate (110) is made of PE I plastic. A first air cavity (120) and a second air cavity (130) are sequentially provided on the substrate (110) in a direction away from the optical fiber side thereof, with the lower end located in a parallel optical path. The wall of the second air cavity (130) close to the first air cavity (120) has a second total reflection surface (131) inclined at 45°, and the wall of the first air cavity (120) away from the second air cavity (130) has a first total reflection surface (121) parallel to the second total reflection surface (131). The chip side of the substrate (110) has a first lens array (140) and a second lens array (150) respectively coupled to the first total reflection surface (121) and the second total reflection surface (131). The second lens array (150) is offset downward by 50 um compared to the first lens array (140). The first air cavity (120) is filled or not filled with a high refractive index glue (160) with a refractive index of 1.6 to 1.

65.

2. The multi-mode lens compatible with optical chips of different thicknesses according to claim 1, characterized in that: The refractive index of the PE I plastic is 1.

64.

3. The multi-mode lens compatible with optical chips of different thicknesses according to claim 2, characterized in that: The refractive index of the high refractive index glue (160) is 1.

64.

4. A multimode optical module, characterized in that: The invention comprises a multimode lens (1) as described in any one of items 1 to 3, wherein the first air cavity (120) of the multimode lens (1) is not filled with a high-refractive-index glue (160) having a refractive index of 1.6 to 1.65, the multimode lens (1) is fixed on a PCB board (2), a 200 mm thick optical chip (3) is arranged on the PCB board (2) in the area covered by the multimode lens (1), the optical chip (3) is coupled to a first lens array (140), and an optical fiber (4) coupled to a first total reflection surface (121) is arranged on the optical fiber side of the multimode lens (1).

5. A multimode optical module, characterized in that: The invention comprises a multimode lens (1) as described in any one of items 1 to 3, wherein a high refractive index glue (160) having a refractive index of 1.6 to 1.65 is filled in a first air cavity (120) of the multimode lens (1), the multimode lens (1) is fixed on a PCB board (2), a 150 mm thick optical chip (3) is arranged on the PCB board (2) in the coverage area of ​​the multimode lens (1), the optical chip (3) is coupled to a second lens array (150), and an optical fiber (4) coupled to a first total reflection surface (121) is arranged on the optical fiber side of the multimode lens (1).