An 800G SR8 optical module based on hollow fiber

Abstract

This invention relates to an 800G SR8 optical module based on hollow-core optical fiber. The multi-step lens fiber side has eight first aspherical lenses, arranged in two groups of four, horizontally aligned at the same height. Each group has four first aspherical lenses arranged in rows of two, one above the other. The horizontal distance between any first aspherical lens in the lower row and its adjacent first aspherical lens in the upper row of the same group is 0.25 mm. The ferrule has eight fiber core holes, also arranged in two groups of four, horizontally aligned at the same height. Each group has four fiber core holes arranged in rows of two, one above the other. The horizontal distance between any fiber core hole in the lower row and its adjacent fiber core hole in the upper row of the same group is 0.25 mm. The advantages are: it ensures mechanical strength and allows the use of array optical chips currently available in the industry chain.

Description

Technical Field

[0001] This invention relates to the field of optical module technology, specifically to an 800G SR8 optical module based on hollow-core optical fiber. Background Technology

[0002] Traditional 800G SR8 optical modules use ordinary solid-core optical fiber. Solid-core fiber has the following disadvantages: large dispersion, large delay, large loss, and poor nonlinearity, resulting in short transmission distances and limiting its application in ultra-large data centers such as AI. Hollow-core fiber can solve these problems. Currently, the channel spacing of array optical chips and electrical chips in the industry chain is 0.25mm, while the outer diameter of solid-core fiber is 0.125mm. For ferrules adapted to solid-core fiber, the eight fiber holes on the ferrule are arranged in a row with an inner diameter of 0.126mm (usually 1um larger is needed for fiber insertion), and the spacing between two adjacent fiber holes is 0.25mm (to adapt to the array optical chips in the current industry chain). For ferrules adapted to hollow-core fiber, the eight fiber holes on the ferrule are arranged in a row, such as... Figure 1 As shown, the spacing between two adjacent fiber core holes is also 0.25mm (to adapt to the array optical chips in the current industry chain). However, due to the complex microstructure of the air gap in hollow optical fiber, its outer diameter is usually greater than 0.2mm, mostly between 0.2mm and 0.35mm. Taking the outer diameter of hollow optical fiber as 0.219mm as an example, the inner diameter of the fiber core hole of the ferrule is 0.22mm (usually 1um larger is needed to thread the fiber). Since the ferrule is made of plastic, if the current industry chain (the channel spacing of the array optical chip is 0.25mm) is used and the fiber core hole spacing of the ferrule is still designed to be 0.25mm, then the wall thickness between two adjacent fiber core holes in the ferrule will be only 0.03mm, which is too thin and the mechanical strength is insufficient. Therefore, it is not possible to use the existing optoelectronic chips in the industry chain. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an 800G SR8 optical module based on hollow fiber to overcome the shortcomings of the prior art.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: An 800GSR8 optical module based on hollow-core optical fiber, comprising: a multi-step lens and a ferrule coupled to the multi-step lens; the eight first aspherical lenses on the fiber side of the multi-step lens are divided into two groups of four and arranged side by side at the same height in the horizontal direction; the four first aspherical lenses in each group are arranged in two rows in an upper and lower arrangement; the horizontal distance between any first aspherical lens in the lower row and the first aspherical lens in the upper row adjacent to it in the same group is 0.25mm; the multi-step lens has... The ferrule has a first 45° reflecting surface coupled to the first aspherical lens in the lower row and a second 45° reflecting surface coupled to the first aspherical lens in the upper row; the ferrule has eight fiber core holes, which are divided into two groups of four and arranged side by side at the same height in the horizontal direction. The four fiber core holes in each group are arranged in two rows in an upper and lower manner. The horizontal distance between any fiber core hole in the lower row and the fiber core hole in the upper row adjacent to it in the same group is 0.25 mm. The hollow optical fiber in the eight fiber core holes of the ferrule is coupled to each of the eight first aspherical lenses.

[0005] The beneficial effects of this invention are as follows: In this invention, the distribution position of the eight fiber core holes of the ferrule is adjusted so that the horizontal distance between any fiber core hole in the lower row of the same group and the fiber core hole in the upper row adjacent to it is 0.25mm. At this time, the horizontal distance between the two fiber core holes in the upper row of the four fiber core holes in each group is 0.5mm, and the horizontal distance between the two fiber core holes in the lower row of the four fiber core holes in each group is 0.5mm. Taking the outer diameter of the hollow fiber as 0.219mm and the inner diameter of the fiber core hole as 0.22mm as an example, when the hollow fiber is configured in the fiber core hole of the ferrule, the wall thickness between two adjacent fiber core holes in the same row can be 0.28mm, which is larger than 0.03mm in the prior art. Therefore, mechanical strength can be guaranteed. With the corresponding multi-step lens, the 800G SR8 optical module can use the array optical chip with a channel spacing of 0.25mm in the current industry chain.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the horizontal distance between the two first aspherical lenses in the upper row and the two first aspherical lenses in the lower row of each group is 0.5±0.05mm; the horizontal distance between the two fiber core holes in the upper row and the two fiber core holes in the lower row of each group is 0.5±0.05mm.

[0008] The further beneficial effect of adopting the above is that when hollow optical fibers are arranged in the core holes of the ferrule, the wall thickness between any one of the four core holes in the upper row and the core hole in the lower row adjacent to it is also larger than 0.03mm in the prior art (taking the outer diameter of the hollow optical fiber as 0.219mm and the inner diameter of the core hole as 0.22mm as an example), so mechanical strength can be guaranteed.

[0009] Furthermore, the first 45° reflective surface has four alternating protrusions, and the upper surface of each protrusion is a second 45° reflective surface.

[0010] Furthermore, the end face of the ferrule has two positioning holes, and the fiber side of the multi-step lens has two positioning posts. The two positioning posts on the multi-step lens are respectively inserted into the two positioning holes on the ferrule.

[0011] The further beneficial effect of the above is that when the ferrule is coupled to the multi-step lens, the two positioning posts on the multi-step lens are respectively inserted into the two positioning holes on the ferrule. Through the cooperation of the positioning posts and positioning holes, the first aspherical lens and the hollow fiber can be accurately aligned.

[0012] Furthermore, the eight second aspherical lenses on the multi-step lens chip side are arranged in two groups of four, with each group having a spacing of 0.25 mm between adjacent second aspherical lenses. Four of the eight second aspherical lenses are coupled to the first 45° reflecting surface, and the other four are coupled to the second 45° reflecting surface.

[0013] Furthermore, the 800G SR8 optical module based on hollow fiber also includes: a PCB board and an array optical chip. At least one multi-step lens is fixed on the PCB board, and an array optical chip is fixed on the PCB board in the coverage area of ​​each multi-step lens. The spacing between two adjacent optical chips on the array optical chip is 0.25mm, and the array optical chip is coupled to a second aspherical lens.

[0014] Furthermore, an electrical chip is fixed on the PCB board in the coverage area of ​​each multi-step lens, and the electrical chip is bonded to the array optical chip with gold wire.

[0015] Furthermore, two multi-step lenses are fixed on the PCB board. Attached Figure Description

[0016] Figure 1 This is an end face view of the ferrule in the prior art;

[0017] Figure 2 The structure of the multi-step lens in this invention Figure 1 ;

[0018] Figure 3The structure of the multi-step lens in this invention Figure 2 ;

[0019] Figure 4 This is a perspective view of the ferrule in this invention;

[0020] Figure 5 This is an end view of the ferrule in this invention;

[0021] Figure 6 This is a front view of the 800G SR8 optical module based on hollow-core optical fiber in this invention;

[0022] Figure 7 This is a top view of the 800G SR8 optical module based on hollow fiber in this invention.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Multi-step lens, 110. First aspherical lens, 120. First 45° reflecting surface, 130. Second 45° reflecting surface, 140. Protrusion, 150. Positioning post, 160. Second aspherical lens, 2. Filament, 210. Fiber core hole, 220. Hollow fiber, 230. Positioning hole, 3. PCB board, 4. Array optical chip, 5. Electrical chip. Detailed Implementation

[0025] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] Example 1

[0027] like Figures 2-7As shown, an 800G SR8 optical module based on hollow-core fiber includes: a multi-step lens 1 and a ferrule 2, wherein the ferrule 2 is inserted and coupled to the multi-step lens 1. The fiber side of the multi-step lens 1 has eight first aspherical lenses 110, that is, the number of first aspherical lenses 110 is consistent with the prior art. The eight first aspherical lenses 110 on the fiber side of the multi-step lens 1 are divided into two groups of four and arranged side by side at the same height in the horizontal direction. That is, the two groups of first aspherical lenses 110 are arranged side by side at the same height in the horizontal direction. The four first aspherical lenses 110 in each group are arranged in rows of two. The lenses are arranged in an upper and lower row configuration, and the horizontal distance between any first aspherical lens 110 in the lower row and the first aspherical lens 110 in the upper row that is adjacent to it (any first aspherical lens 110 in the lower row) is 0.25mm. In this case, it can be understood that the horizontal distance between the two first aspherical lenses 110 in the upper row of the four first aspherical lenses 110 in each group is 0.5mm, and the horizontal distance between the two first aspherical lenses 110 in the lower row of the four first aspherical lenses 110 in each group is 0.5mm.

[0028] The multi-step lens 1 has a first 45° reflecting surface 120 coupled to the first aspherical lens 110 located in the lower row. In addition, the multi-step lens 1 has a second 45° reflecting surface 130 coupled to the first aspherical lens 110 located in the upper row. The second 45° reflecting surface 130 is at a vertical height of the first 45° reflecting surface 120.

[0029] The ferrule 2 has eight fiber optic holes 210, consistent with existing technology. The eight fiber optic holes 210 are divided into two groups of four and arranged horizontally at the same height. Each group of four fiber optic holes 210 is arranged in two rows, one above the other. The horizontal distance between any fiber optic hole 210 in the lower row and any adjacent fiber optic hole 210 in the upper row within the same group is 0.25 mm. This can be understood as the horizontal distance between the two fiber optic holes 210 in the upper row of each group being 0.5 mm. The horizontal spacing between the two fiber core holes 210 in the lower row of the four fiber core holes 210 in the assembly is 0.5 mm. When the ferrule 2 is inserted and coupled to the multi-step lens 1, the eight fiber core holes 210 of the ferrule 2 correspond one-to-one with the eight first aspherical lenses 110 on the multi-step lens 1. A hollow fiber 220 is arranged in each fiber core hole 210, and the eight hollow fibers 220 are coupled one-to-one with the eight first aspherical lenses 110. For the received light, the light emitted from the hollow fiber 220 is coupled into the first aspherical lens 110, and then reflected to the chip side of the multi-step lens 1 via the first 45° reflecting surface 120 or the second 45° reflecting surface 130. Similarly, for the emitted light, the optical path is exactly the opposite, which will not be described in detail here.

[0030] In this invention, the distribution of the eight fiber core holes 210 of the ferrule 2 is adjusted such that the horizontal distance between any fiber core hole 210 in the lower row of the same group and the adjacent fiber core hole 210 in the upper row is 0.25 mm. At this time, the horizontal distance between the two fiber core holes 210 in the upper row of each group is 0.5 mm, and the horizontal distance between the two fiber core holes 210 in the lower row of each group is also 0.5 mm. Taking an outer diameter of 0.219 mm for the hollow fiber 210 and an inner diameter of 0.22 mm for the fiber core hole 210 as an example, when a hollow fiber 220 is arranged inside the fiber core hole 210 of the ferrule 2, the wall thickness between two adjacent fiber core holes 210 in the same row can be 0.28 mm, which is larger than the 0.03 mm in the prior art. Therefore, mechanical strength can be guaranteed. Combined with the corresponding multi-step lens 1, this ensures that the 800G... The SR8 optical module can use the array optical chip with a channel pitch of 0.25mm currently used in the industry chain.

[0031] Example 2

[0032] like Figure 2 , Figure 4 , Figure 5 As shown, this embodiment is a further improvement on embodiment 1, as detailed below:

[0033] In each group of four aspherical lenses 110, the height distance between the two aspherical lenses 110 in the upper row and the two aspherical lenses 110 in the lower row is 0.5 ± 0.05 mm. This also indicates that the two aspherical lenses 110 in the upper row of each group are of equal height, and the two aspherical lenses 110 in the lower row of each group are of equal height. Similarly, in each group of four fiber core holes 210, the height distance between the two fiber core holes 210 in the upper row and the two fiber core holes 210 in the lower row is 0.5 ± 0.05 mm. This also indicates that in each group... Of the four fiber core holes 210, the two fiber core holes 210 in the upper row are distributed at the same height, and the two fiber core holes 210 in the lower row of each group are distributed at the same height. When the fiber core holes 210 of the ferrule 2 are configured with hollow fiber 220, the wall thickness between any fiber core hole 210 in the upper row and the fiber core hole 210 in the lower row adjacent to it in each group is also larger than the 0.03mm in the prior art. Taking the outer diameter of the hollow fiber 210 as 0.219mm and the inner diameter of the fiber core hole 210 as 0.22mm as an example, the wall thickness is 0.28±0.05mm, so mechanical strength can be guaranteed.

[0034] Example 3

[0035] like Figure 2 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below:

[0036] The first 45° reflecting surface 120 has four alternating protrusions 140, and the upper surface of each protrusion 140 is a second 45° reflecting surface 130. The four second 45° reflecting surfaces 130 are coupled to the four first aspherical lenses 110 in the upper row of the eight first aspherical lenses 110. Since the height distance between the two first aspherical lenses 110 in the upper row and the two first aspherical lenses 110 in the lower row of each group is 0.5±0.05mm, the height distance between the first 45° reflecting surface 120 and the second 45° reflecting surface 130 is also 0.5±0.05mm. For receiving light, the first aspherical lenses 110 in the upper row are coupled to the second 45° reflecting surface 130, and then reflected by the second 45° reflecting surface 130 to the chip side of the multi-step lens 1.

[0037] Example 4

[0038] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, this embodiment is a further improvement on embodiment 1, 2, or 3, as detailed below:

[0039] The end face of the ferrule 2 has two positioning holes 230, while the fiber side of the multi-step lens 1 has two positioning posts 150. When the ferrule 2 is inserted and coupled to the multi-step lens 1, the two positioning posts 150 on the multi-step lens 1 are respectively inserted into the two positioning holes 230 on the ferrule 2. Through the cooperation of the positioning posts 150 and the positioning holes 230, the first aspherical lens 110 and the hollow fiber 220 can be accurately aligned.

[0040] Example 5

[0041] like Figure 3 As shown, this embodiment is a further improvement on any one of embodiments 1 to 4, as detailed below:

[0042] The eight second aspherical lenses 160 on the chip side of the multi-step lens 1 are arranged in two groups of four, with each group having a spacing of 0.25 mm between adjacent second aspherical lenses 160, which is consistent with the existing technology and can be applied to the array optical chip 4 in the existing industry chain. Four of the eight second aspherical lenses 160 are coupled to the first 45° reflecting surface 120, and the other four are coupled to the second 45° reflecting surface 130. For the received light, the light emitted from the hollow fiber 220 is coupled into the first aspherical lens 110, and then reflected by the first 45° reflecting surface 120 or the second 45° reflecting surface 130 to the second aspherical lenses 160 on the chip side of the multi-step lens 1, and finally coupled into the array optical chip 4 by the second aspherical lenses 160.

[0043] Example 6

[0044] like Figure 6 , Figure 7 As shown, this embodiment is a further improvement on embodiment 5, as detailed below:

[0045] The 800G SR8 optical module based on hollow fiber also includes: a PCB board 3 and an array optical chip 4. At least one multi-step lens 1 is fixed on the PCB board 3. An array optical chip 4 is fixed on the PCB board 3 in the coverage area of ​​each multi-step lens 1. The spacing between two adjacent optical chips on the array optical chip 4 is 0.25mm. The array optical chip 4 is coupled with a second aspherical lens 160, that is, four optical chips on the array optical chip 4 are coupled with four second aspherical lenses 160 in the same group.

[0046] In addition, an electrical chip 5 is fixed on the PCB board 3 in the coverage area of ​​each multi-step lens 1, and the electrical chip 5 is bonded to the array optical chip 4 with gold wire.

[0047] Furthermore: Two multi-step lenses 1 are fixed on the PCB board 3, so at this time, there will be two ferrules 2, four array light chips 4, and four electrical chips 5.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An 800G SR8 optical module based on hollow-core optical fiber, characterized in that, include: A multi-step lens (1) and a ferrule (2) coupled to the multi-step lens (1). The multi-step lens (1) has eight first aspherical lenses (110) on the fiber side, which are divided into two groups of four and arranged side by side at the same height in the horizontal direction. The four first aspherical lenses (110) in each group are arranged in two rows in an upper and lower row manner. The horizontal distance between any first aspherical lens (110) in the lower row and the first aspherical lens (110) in the upper row adjacent to it in the same group is 0.25 mm. The multi-step lens (1) has a first 45° reflecting surface (120) coupled to the first aspherical lens (110) in the lower row and a first 45° reflecting surface (120) coupled to the first aspherical lens (110) in the upper row. The second 45° reflecting surface (130) is coupled to the first aspherical lens (110) in the upper row; the ferrule (2) has eight fiber core holes (210), the eight fiber core holes (210) of the ferrule (2) are divided into two groups of four and arranged side by side at the same height in the horizontal direction, the four fiber core holes (210) in each group are arranged in two rows in an upper and lower row manner, the horizontal distance between any fiber core hole (210) in the lower row and the fiber core hole (210) in the upper row adjacent to it in the same group is 0.25mm, and the hollow fiber (220) in the eight fiber core holes (210) of the ferrule (2) is coupled to the eight first aspherical lenses (110) one by one.

2. The 800G SR8 optical module based on hollow-core optical fiber according to claim 1, characterized in that, The height distance between the two first aspherical lenses (110) in the upper row and the two first aspherical lenses (110) in the lower row of each group is 0.5±0.05mm; the height distance between the two fiber core holes (210) in the upper row and the two fiber core holes (210) in the lower row of each group is 0.5±0.05mm.

3. The 800G SR8 optical module based on hollow-core optical fiber according to claim 1, characterized in that, The first 45° reflective surface (120) has four alternating protrusions (140), and the upper surface of each protrusion (140) is a second 45° reflective surface (130).

4. An 800G SR8 optical module based on hollow-core optical fiber according to claim 1, characterized in that, The end face of the ferrule (2) has two positioning holes (230), and the fiber side of the multi-step lens (1) has two positioning posts (150). The two positioning posts (150) on the multi-step lens (1) are respectively inserted into the two positioning holes (230) on the ferrule (2).

5. An 800G SR8 optical module based on hollow-core optical fiber according to any one of claims 1 to 4, characterized in that, The multi-step lens (1) chip side has eight second aspherical lenses (160) arranged in two groups of four, with each group having a spacing of 0.25 mm between two adjacent second aspherical lenses (160). Four of the eight second aspherical lenses (160) are coupled to the first 45° reflecting surface (120), and the other four second aspherical lenses (160) are coupled to the second 45° reflecting surface (130).

6. An 800G SR8 optical module based on hollow-core optical fiber according to claim 5, characterized in that, Also includes: The PCB board (3) and the array light chip (4) are provided. Two multi-step lenses (1) are fixed on the PCB board (3). The array light chip (4) is fixed in the coverage area of ​​each multi-step lens (1) on the PCB board (3). The spacing between two adjacent light chips on the array light chip (4) is 0.25 mm. The array light chip (4) is coupled to the second aspherical lens (160).

7. An 800G SR8 optical module based on hollow-core optical fiber according to claim 6, characterized in that, On the PCB board (3), an electrical chip (5) is fixed in the coverage area of ​​each multi-step lens (1), and the electrical chip (5) is bonded to the array optical chip (4) with gold wire.

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