MT insertion core and 800G SR8 optical engine based on hollow-core optical fiber
By designing an MT ferrule adapted to air-core optical fiber and a specific optical path coupling structure, the problem of insufficient transmission performance of traditional optical engines is solved, and an efficient optical communication solution that is compatible with the existing industrial chain is realized.
Patent Information
- Application Number
- CN202422238033.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-11
AI Technical Summary
The traditional 800G SR8 optical engine uses solid-core optical fibers with problems such as large dispersion, large delay, large loss and poor nonlinearity, resulting in short transmission distances and making it difficult to apply in ultra-large data centers such as AI. The existing MT ferrule cannot adapt to the industrial chain optoelectronic chips of hollow-core optical fibers.
A MT ferrule is designed with a laterally distributed core hole, which accommodates eight hollow core fibers with a spacing of 0.25mm, and fills the gap between the hollow core fiber and the core hole with structural hard glue, adjusts the core hole structure to adapt to the hollow core fiber, and combines the specific layout of the lens and the electric chip to achieve optical path coupling.
The 800G SR8 optical engine based on air core fiber can be compatible with array optical chips with channel spacing of 0.25mm in the existing industrial chain, improve transmission performance, and is suitable for optical communication applications in ultra-large data centers.
Smart Images
Figure CN223065557U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical communication, and particularly relates to an MT ferrule and an 800G SR8 optical engine based on hollow-core optical fiber. Background Art
[0002] The traditional 800G SR8 optical engine uses ordinary solid-core optical fiber, and the solid-core optical fiber has the following disadvantages: large dispersion, large delay, large loss, and poor nonlinearity, resulting in a short transmission distance and limited application in ultra-large data centers such as AI. Hollow-core optical fiber can solve the above problems. At present, the channel pitch of array optical chips and electrical chips in the industrial chain is 0.25mm, and the outer diameter of the solid-core optical fiber is 0.125mm. For the MT ferrule adapted to the solid-core optical fiber, the eight fiber core holes on the MT ferrule are arranged in a row, and the inner diameter of the fiber core hole is 0.126mm (usually 1um larger to allow the fiber to pass through), and the distance between adjacent two fiber core holes is 0.25mm (to adapt to the array optical chips in the current industrial chain). For the MT ferrule adapted to the hollow-core optical fiber, the eight fiber core holes on the MT ferrule are arranged in a row. As Figure 1 shown, the distance between adjacent two fiber core holes is also 0.25mm (to adapt to the array optical chips in the current industrial chain). However, due to the complex air-gap microstructure of the hollow-core optical fiber, its outer diameter is usually greater than 0.2mm, mostly 0.2mm - 0.35mm. Taking the outer diameter of the hollow-core optical fiber as 0.25mm as an example, the inner diameter of the fiber core hole of the MT ferrule will be designed as 0.251mm. Since the MT ferrule is made of plastic material, if the current industrial chain (the channel pitch of the array optical chip is 0.25mm) is still used at this time, then the distance between the fiber core holes of the MT ferrule also needs to be designed as 0.25mm, which will result in the wall thickness between adjacent two fiber core holes in the MT ferrule being only 0mm, while there is still thin plastic in other places between adjacent two fiber core holes except for tangency, and the existing industrial chain optoelectronic chips cannot be used. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide an MT ferrule and an 800G SR8 optical engine based on hollow-core optical fiber to overcome the deficiencies in the above-mentioned prior art.
[0004] The technical solution of the utility model to solve the above technical problem is as follows: An MT ferrule has a fiber core hole distributed horizontally. Eight hollow-core optical fibers arranged in a row horizontally with a pitch of 0.25mm are accommodated in the fiber core hole, and structural hard glue is filled in the gap between the hollow-core optical fiber and the fiber core hole.
[0005] On the basis of the above technical solution, the utility model can be further improved as follows.
[0006] Further, a tapered chamfer is provided at the orifice of the tail end of the fiber core hole, and soft glue is filled in the gap between the hollow-core optical fiber and the tapered chamfer at the tail end of the fiber core hole.
[0007] Further, the length of the core hole is the same as the length formed by eight hollow optical fibers arranged in a row, and the width of the core hole is 0.001 mm larger than the outer diameter of the hollow optical fiber.
[0008] Furthermore, the core hole is a waist-shaped hole.
[0009] Based on the above technical solution, the present utility model further provides an 800G SR8 optical engine based on hollow optical fibers, including: a lens, a PCB board, and an MT ferrule. At least one lens is fixed on the PCB board along its width direction, and one MT ferrule is plugged and coupled to each lens. Two array optical chips and two electrical chips are fixed in the covered area of each lens on the PCB board. The two electrical chips are wire-bonded to the two array optical chips respectively, and the two array optical chips are coupled to the lens respectively.
[0010] Further, the fiber side of the lens has eight first aspherical lenses arranged in a row transversely, and the eight first aspherical lenses are respectively coupled to eight hollow optical fibers; the chip side of the lens has eight second aspherical lenses. The eight second aspherical lenses on the chip side of the lens are divided into two groups with four in each group and are distributed parallel to each other in the front and back in the horizontal direction without overlapping. The four second aspherical lenses in each group are arranged in a row transversely; the lens has a first 45° reflecting surface and a second 45° reflecting surface at different heights. Among the eight first aspherical lenses, four adjacent first aspherical lenses are coupled to the four second aspherical lenses in one group one by one through the first 45° reflecting surface, and the other four adjacent first aspherical lenses are coupled to the four second aspherical lenses in the other group one by one through the second 45° reflecting surface.
[0011] Further, the distance between the two groups of second aspherical lenses in the horizontal direction is 0.5 mm, and the two electrical chips are respectively located outside the two array optical chips.
[0012] Further, the fiber side of the lens has two guide posts, and the MT ferrule has two guide holes. The two guide posts on the lens are inserted into the two guide holes on the MT ferrule.
[0013] Further, one of the two array optical chips under each lens is a receiving optical array chip, and the other is a transmitting optical array chip. One of the two electrical chips under each lens is a receiving optoelectronic chip, and the other is a transmitting optoelectronic chip.
[0014] Further, two lenses are fixed on the PCB board.
[0015] The beneficial effects of the present utility model are as follows: The original eight fiber core holes of the MT ferrule in the prior art are adjusted to one, and eight hollow core optical fibers are accommodated through this fiber core hole at one time. Then, the gap between the fiber core hole and the eight hollow core optical fibers is filled with structural hard glue to fix the eight hollow core optical fibers, so that the MT ferrule can use the array optical chip with a channel pitch of 0.25 mm in the current industrial chain. Thus, the 800G SR8 optical engine based on hollow core optical fibers can use the array optical chip with a channel pitch of 0.25 mm in the current industrial chain. Description of the Drawings
[0016] Figure 1 is the end face view of the MT ferrule in the prior art;
[0017] Figure 2 is the structure of the MT ferrule in the present utility model after removing the hollow core optical fibers Figure 1 ;
[0018] Figure 3 is the structure of the MT ferrule in the present utility model after removing the hollow core optical fibers Figure 2 ;
[0019] Figure 4 is the cross-sectional view of the MT ferrule in the present utility model;
[0020] Figure 5 is the structure of the lens in the present utility model Figure 1 ;
[0021] Figure 6 is the structure of the lens in the present utility model Figure 2 ;
[0022] Figure 7 is the top view of the 800G SR8 optical engine based on hollow core optical fibers in the present utility model;
[0023] Figure 8 is the front view of the 800G SR8 optical engine based on hollow core optical fibers in the present utility model;
[0024] Figure 9 is the distribution diagram of the array optical chip and the electrical chip on the PCB board in the present utility model.
[0025] In the drawings, the list of components represented by each reference numeral is as follows:
[0026] 1. Lens, 110. First aspherical lens, 120. Second aspherical lens, 130. First 45° reflecting surface, 140. Second 45° reflecting surface, 150. Guide post, 2. MT ferrule, 210. Fiber core hole, 220. Hollow core optical fiber, 230. Structural hard glue, 240. Tapered chamfer, 250. Soft glue, 260. Guide hole, 3. PCB board, 4. Array optical chip, 5. Electrical chip. Detailed implementation manners
[0027] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.
[0028] Embodiment 1
[0029] As Figure 2 、 Figure 3 、 Figure 4 shown, an MT ferrule. The MT ferrule 2 has a core hole 210 distributed transversely (hereafter, the transverse direction can be understood as the width direction of the PCB board 3 according to the subsequent description). The core hole 210 accommodates eight hollow core optical fibers 220 arranged in a row transversely. The transverse distance between two adjacent hollow core optical fibers 220 among the eight hollow core optical fibers 220 is 0.25 mm. In addition, a structural hard glue 230 is filled in the gap between the hollow core optical fiber 220 and the core hole 210 to fix the hollow core optical fiber 220. The structural hard glue 230 used can be the common 353ND epoxy glue.
[0030] The original eight core holes 210 of the MT ferrule 2 in the prior art are adjusted to one, and eight hollow core optical fibers 220 are accommodated through the core hole 210 at one time. Then, the gap between the core hole 210 and the eight hollow core optical fibers 220 is filled with the structural hard glue 230 to fix the eight hollow core optical fibers 220, so that the MT ferrule 2 can use the array optical chip 4 with a channel pitch of 0.25 mm in the current industrial chain.
[0031] Embodiment 2
[0032] As Figure 3 、 Figure 4 shown, this embodiment is a further improvement on Embodiment 1, specifically as follows:
[0033] A conical chamfer 240 is provided at the orifice of the tail end of the core hole 210. A soft glue 250 is filled in the gap between the hollow core optical fiber 220 and the conical chamfer 240 at the tail end of the core hole 210. The hollow core optical fiber 220 can be protected by dotting the soft glue 250. The degree of the conical chamfer 240 is 10°.
[0034] Embodiment 3
[0035] As Figure 2 、 Figure 3 、 Figure 4 shown, this embodiment is a further improvement on Embodiment 1 or 2, specifically as follows:
[0036] The length of the core hole 210 is the same as the length formed by eight hollow optical fibers 220 arranged in a row. That is, it can be understood that the length of the core hole 210 is equal to 8 times the outer diameter of the hollow optical fiber 220. The width of the core hole 210 is 0.001 mm larger than the outer diameter of the hollow optical fiber 220. Generally, a 0.001 mm increase is sufficient for fiber threading. Taking the outer diameter of the hollow optical fiber 220 as 0.25 mm as an example, the width of the core hole 210 is 0.251 mm, and the length of the core hole 210 is 2 mm. In addition, in this embodiment, the core hole 210 is preferably a waist-shaped hole.
[0037] Embodiment 4
[0038] As Figures 2 to 9 shown, an 800G SR8 optical engine based on hollow optical fibers includes: a lens 1, a PCB board 3, and an MT ferrule 2 as described in any one of Embodiments 1 to 3. At least one lens 1 is fixed on the PCB board 3 along its width direction. On the PCB board 3, two array optical chips 4 and two electrical chips 5 are fixed in the covering area of each lens 1. The two electrical chips 5 are wire-bonded to the two array optical chips 4 respectively. The two array optical chips 4 are respectively coupled to two groups of second aspherical lenses 120. The channel pitch of the two array optical chips 4 is 0.25 mm, and both are four-channel array optical chips, which is consistent with the prior art. In this solution, the MT ferrule 2 with the above specific structure is adopted, so that the 800G SR8 optical engine based on hollow optical fibers can use the array optical chips 4 with a channel pitch of 0.25 mm in the current industrial chain.
[0039] Embodiment 5
[0040] As Figure 5 、 Figure 6 shown, this embodiment is a further improvement on Embodiment 4, specifically as follows:
[0041] The fiber side of the lens 1 has eight first aspherical lenses 11. The eight first aspherical lenses 11 on the fiber side of the lens 1 are arranged in a row horizontally. The eight first aspherical lenses 110 are respectively coupled to eight hollow optical fibers 220. That is, the horizontal pitch between two adjacent first aspherical lenses 110 among the eight first aspherical lenses 110 is also 0.25 mm;
[0042] The chip side of the lens 1 has eight second aspherical lenses 120. The eight second aspherical lenses 120 on the chip side of the lens 1 are divided into two groups with four in each group and are distributed parallel and non-overlapping in the horizontal direction (it can be understood that the horizontal direction described later is the length direction of the PCB board 3). The four second aspherical lenses 120 in each group are arranged in a row horizontally. The horizontal pitch between two adjacent second aspherical lenses 120 among the eight second aspherical lenses 120 is 0.25 mm;
[0043] The lens 1 has a first 45° reflecting surface 130 and a second 45° reflecting surface 140 at different heights. Among the eight first aspherical lenses 110, four adjacent first aspherical lenses 110 are coupled to four second aspherical lenses 120 in one group one by one through the first 45° reflecting surface 130, and the other four adjacent first aspherical lenses 110 among the eight first aspherical lenses 110 are coupled to the other four second aspherical lenses 120 in the other group one by one through the second 45° reflecting surface 140.
[0044] Assuming that the first 45° reflecting surface 130 is in the emission light optical path, then, the four-way emission light is first coupled into the four second aspherical lenses 120, and then coupled from the four second aspherical lenses 120 to the first 45° reflecting surface 130, and reflected by the first 45° reflecting surface 130 into the four first aspherical lenses 110.
[0045] Assuming that the second 45° reflecting surface 140 is in the reception light optical path, then, the four-way reception light is first coupled into the four first aspherical lenses 110, and then coupled from the four first aspherical lenses 110 to the second 45° reflecting surface 140, and reflected by the second 45° reflecting surface 140 into the four second aspherical lenses 120.
[0046] Furthermore: the distance between the two groups of second aspherical lenses 120 in the horizontal direction is 0.5 mm, and the two electrical chips 5 are respectively located outside the two array optical chips 4, as Figure 9 shown.
[0047] Embodiment 6
[0048] As Figure 2 , Figure 3 , Figure 5 , Figure 6 shown, this embodiment is a further improvement on the basis of Embodiment 4 or 5, and is specifically as follows:
[0049] The lens 1 has two guiding columns 150 on the optical fiber side, and the MT ferrule 2 has two guiding holes 260. The two guiding columns 150 on the lens 1 are inserted into the two guiding holes 260 on the MT ferrule 2. When the MT ferrule 2 is plugged and coupled with the lens 1, the two guiding columns 150 on the lens 1 are respectively inserted into the two guiding holes 260 on the MT ferrule 2. Through the cooperation of the guiding columns 150 and the guiding holes 260, the accurate alignment of the first aspherical lens 110 and the hollow optical fiber 220 can be ensured.
[0050] In addition, one of the two array optical chips 4 under each lens 1 is a receiving optical array optical chip, and the other is a transmitting optical array optical chip. One of the two electrical chips 5 under each lens 1 is a receiving optoelectronic chip, and the other is a transmitting optoelectronic chip. Two lenses 1 are fixed on the PCB board 3.
[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.
Claims
1. An MT ferrule, characterized in that, It has a core hole (210) distributed transversely. Eight hollow optical fibers (220) arranged in a row transversely with a spacing of 0.25 mm are accommodated in the core hole (210), and a structural hard glue (230) is filled in the gap between the hollow optical fiber (220) and the core hole (210).
2. A MT ferrule according to claim 1, wherein A tapered chamfer (240) is provided at the orifice of the tail end of the core hole (210), and a soft glue (250) is filled in the gap between the hollow optical fiber (220) and the tapered chamfer (240) at the tail end of the core hole (210).
3. A MT ferrule according to claim 1, characterized in that, The length of the core hole (210) is the same as the length formed by eight hollow optical fibers (220) arranged in a row, and the width of the core hole (210) is 0.001 mm larger than the outer diameter of the hollow optical fiber (220).
4. The MT ferrule according to claim 3, wherein The core hole (210) is a waist-shaped hole.
5. An 800G SR8 optical engine based on a hollow-core optical fiber, characterized in that, Comprising: A lens (1), a PCB board (3), and an MT ferrule (2) according to any one of claims 1 to 4. At least one lens (1) is fixed along the width direction of the PCB board (3). One MT ferrule (2) is plugged and coupled to each lens (1). Two array optical chips (4) and two electrical chips (5) are fixed in the covered area of each lens (1) on the PCB board (3). The two electrical chips (5) are wire-bonded to the two array optical chips (4) respectively, and the two array optical chips (4) are coupled to the lens (1) respectively.
6. The 800G SR8 optical engine based on a hollow-core optical fiber according to claim 5, wherein The fiber side of the lens (1) has eight first aspherical lenses (110) arranged in a row transversely. The eight first aspherical lenses (110) are coupled to the eight hollow optical fibers (220) respectively. The chip side of the lens (1) has eight second aspherical lenses (120). The eight second aspherical lenses (120) on the chip side of the lens (1) are divided into two groups with four in each group and are distributed parallel to each other in the front and back in the horizontal direction without overlapping. The four second aspherical lenses (120) in each group are arranged in a row transversely. The lens (1) has a first 45° reflecting surface (130) and a second 45° reflecting surface (140) at different heights. Four adjacent first aspherical lenses (110) among the eight first aspherical lenses (110) are coupled to the four second aspherical lenses (120) in one group one by one through the first 45° reflecting surface (130), and the other four adjacent first aspherical lenses (110) are coupled to the four second aspherical lenses (120) in the other group one by one through the second 45° reflecting surface (140).
7. An 800G SR8 optical engine based on a hollow-core optical fiber according to claim 6, characterized in that, The distance between the two groups of second aspherical lenses (120) in the horizontal direction is 0.5 mm, and the two electrical chips (5) are respectively located outside the two array optical chips (4).
8. An 800G SR8 optical engine based on a hollow-core optical fiber according to claim 5, characterized in that, The fiber side of the lens (1) has two guide posts (150), and the MT ferrule (2) has two guide holes (260). The two guide posts (150) on the lens (1) are inserted into the two guide holes (260) on the MT ferrule (2).
9. The 800G SR8 optical engine based on a hollow-core optical fiber according to claim 5, wherein Each of the two array optical chips (4) below each lens (1), one of the array optical chips (4) is a receiving optical array optical chip, and the other is a transmitting optical array optical chip. Each of the two electrical chips (5) below each lens (1), one of the electrical chips (5) is a receiving optoelectronic chip, and the other is a transmitting optoelectronic chip.
10. An 800G SR8 optical engine based on a hollow-core optical fiber according to claim 8, characterized in that, Two lenses (1) are fixed on the PCB board (3).