Novel miniaturized high-density metal MT beam expanding contact element
By employing a self-focusing lens and a split ferrule design in the MT beam expander contact, the dust resistance and alignment accuracy issues of the single-mode fiber MT beam expander contact were solved, achieving high-density, dust-resistant, and reliable optical signal transmission.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2026-04-10
AI Technical Summary
Existing technologies are insufficient to effectively improve the dust resistance and alignment accuracy of single-mode fiber MT beam expander contacts, and existing beam expander technologies cannot meet the needs of military users.
A novel miniaturized high-density metal MT beam expander contact is designed, which uses a self-focusing lens to magnify the light spot and is composed of a split MT insert and cover plate. Combined with the design of guide groove and guide boss, it ensures alignment accuracy and dust resistance.
It improves the dust resistance of the contacts, reduces the loss of single-mode beam expansion, meets the high requirements of single-mode fiber for dust sensitivity and alignment accuracy, and adapts to the reliability of high-speed signal transmission and harsh environments.
Smart Images
Figure CN224109742U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of connector technology, and in particular relates to a novel miniaturized high-density metal MT beam expander contact. Background Technology
[0002] With the increasing maturity of fiber optic connector technology, its use in connectors is becoming more and more widespread. Currently, the adoption of fiber optic expansion technology at the interface of all optical links is a basic requirement for many users. However, at the tail end of optical modules, most fiber optic connectors (MTs) are used, which have high density and small size, necessitating fiber optic expansion technology to improve the dust resistance of the MTs. Currently, this is achieved primarily through the following two methods:
[0003] 1. MTs often use coating technology (high negative fiber) to improve the dust resistance of the MT end face. However, this technology only makes the MT connection non-contact. It reduces the wear on the mating end face during MT connection to a certain extent and improves the insertion and extraction life of the connector. In essence, the light spot of MT connection is not magnified, so it cannot fundamentally improve the dust resistance of the connector.
[0004] 2. Employs an MXC ferrule structure with a 50-micron microlens integrated on the end face. Various ferrule types are available, typically 12 channels per row with a guide pin spacing of 4.6mm (consistent with existing MT); and 16 channels per row with a guide pin spacing of 5.2mm, such as... Figure 1 As shown. The difference between the ferrule and a regular MT ferrule is that the ferrule has a fiber stop surface at the front end. After the precisely cut fiber is pushed into the ferrule, it rests on this surface, which is the focal length of the lens. Thus, after the fiber passes through the lens, it can couple into the fiber at the other end. The MXC structure enlarges the light spot smaller and only has a multimode configuration, which cannot meet the needs of current military users.
[0005] MT expander contacts using single-mode fiber are more sensitive to dust than MT expander contacts using multimode fiber. Also, because single-mode fiber is thinner, MT expander contacts using single-mode fiber have higher requirements for alignment accuracy than MT expander contacts using multimode fiber.
[0006] To address the aforementioned issues, a novel miniaturized high-density metal MT expander contact for connectors is designed. Utility Model Content
[0007] This utility model addresses the problems in the prior art by proposing the following technical solution:
[0008] A novel miniaturized high-density metal MT beam expander contact includes an MT ferrule, wherein the MT ferrule has a light-passing hole perpendicular to the end face of the MT ferrule, and a self-focusing lens for magnifying the light spot, a ceramic ferrule coupled to the self-focusing lens, and a single-mode optical fiber fixed on the ceramic ferrule are sequentially assembled in the light-passing hole.
[0009] The MT ferrule is provided with an opening, and an MT cover plate is detachably installed at the opening.
[0010] As a preferred form of the above technical solution, the two ends of the self-focusing lens are fixed in the A-section light hole and the B-section light hole by glue respectively.
[0011] As a preferred form of the above technical solution, eight light holes are provided, and the eight light holes are distributed in two groups in a matrix in the MT ferrule.
[0012] As a preferred form of the above technical solution, a guide groove is arranged on the MT cover plate, and a guide boss is arranged at the opening of the MT ferrule, and the guide boss is matched with the guide groove.
[0013] As a preferred form of the above technical solution, the MT ferrule is made of metal.
[0014] As a preferred form of the above technical solution, the self-focusing lens is double-sided coated, and the coupling end of the self-focusing lens and the ceramic ferrule is arranged at an eight-degree angle.
[0015] As a preferred form of the above technical solution, the first end of the MT ferrule is arranged as a concave surface, and the end surface of the focusing lens after assembly is flush with the concave surface.
[0016] As a preferred form of the above technical solution, a guide seat for supporting the assembled spring is further included, the guide seat is matched with the MT ferrule and the MT cover plate to form a contact piece, and the single-mode optical fiber penetrates through the guide seat.
[0017] As a preferred form of the above technical solution, a guide through hole one is arranged on the MT ferrule, and a guide through hole two is arranged on the guide seat.
[0018] The guide needle is interference-fitted in the guide through hole one, and one end of the guide needle extends into the guide through hole two and cooperates with the gap.
[0019] As a preferred form of the above technical solution, an installation groove penetrating through all the light holes and the guide seat is further included, the installation groove is distributed on the MT ferrule and the MT cover plate, and the single-mode optical fiber is fixed in the installation groove by glue.
[0020] The beneficial effects of the utility model are as follows:
[0021] In this technical solution, a self-focusing lens is used to magnify the light spot, effectively improving the dust resistance of the contact. The self-focusing lens also improves assemblability and reduces return loss. The MT ferrule and MT cover plate form a complete ferrule; the ferrule is a separate unit, allowing for adjustment of the self-focusing lens and reducing single-mode beam expansion loss. This novel miniaturized high-density metal MT beam expander contact meets the high requirements for dust sensitivity and alignment accuracy when using single-mode fiber in the MT beam expander contact. Attached Figure Description
[0022] Figure 1 The figure shown is a perspective view of a novel miniaturized high-density metal MT beam expander contact in Embodiment 1;
[0023] Figure 2 The image shown is a front view of a novel miniaturized high-density metal MT beam expander contact according to Embodiment 1;
[0024] Figure 3 What is shown is Figure 2 A schematic diagram from the left of a novel miniaturized high-density metal MT beam expander contact.
[0025] Figure 4 The diagram shown is a cross-sectional schematic of a novel miniaturized high-density metal MT beam expander contact in Embodiment 1.
[0026] Figure 5 The diagram shown is a structural schematic of the MT ferrule in Example 1;
[0027] Figure 6 The diagram shown is a structural schematic of the MT cover plate in Embodiment 1.
[0028] Reference numerals: MT ferrule 10; A-section light-transmitting hole 11; B-section light-transmitting hole 12; mounting groove 13; guide through hole one 14; concave surface 15; guide boss 16; MT cover plate 20; guide groove 21; guide seat 30; guide through hole two 31; self-focusing lens 40; ceramic ferrule 50; single-mode optical fiber 60; guide pin 70; adhesive 80. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.
[0030] Example 1
[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, a novel miniaturized high-density metal MT expansion contact includes an MT ferrule 10, wherein, in order to improve the structural strength of the MT expansion contact and improve the reliability of the MT, the MT ferrule 10 is made of metal, a light transmission hole perpendicular to the end face of the MT ferrule 10 is arranged in the MT ferrule 10, in order to ensure the perpendicularity of the light transmission hole and the end face of the MT ferrule 10, the light transmission hole is integrally processed, and a self-focusing lens 40 for expanding a light spot, a ceramic ferrule 50 coupled with the self-focusing lens 40, and a single-mode optical fiber 60 fixed on the ceramic ferrule 50 are sequentially assembled in the light transmission hole; when assembling the components in the light transmission hole, the self-focusing lens 40 is pre-assembled in the light transmission hole and fixed with glue, then the MT ferrule 10 is fixed on a tool, the polished ceramic ferrule 50 is coupled with the self-focusing lens 40, the outgoing light is perpendicular to the MT end face, and the butt joint performance of the MT is ensured.
[0032] An opening is arranged on the MT ferrule 10, and an MT cover plate 20 is detachably installed at the opening, the light transmission hole is arranged as an A-section light transmission hole 11 and a B-section light transmission hole 12 connected in a penetrating manner, and the B-section light transmission hole 12 is distributed on the MT ferrule 10 and the MT cover plate 20.
[0033] In the technical solution, the self-focusing lens 40 is used to amplify the light spot, which effectively improves the dust resistance of the contact, and the self-focusing lens 40 is arranged, which is better in assembly and is conducive to improving the return loss; the MT ferrule 10 and the MT cover plate 20 form a complete ferrule, that is, the ferrule is arranged in a split type, so that the self-focusing lens 40 has an adjusting space and reduces the loss of single-mode expansion, and the novel miniaturized high-density metal MT expansion contact in the technical solution meets the high requirements of dust sensitivity and alignment accuracy when the MT expansion contact uses a single-mode optical fiber 60.
[0034] More specifically, as shown in Figure 4 , the two ends of the self-focusing lens 40 are fixed in the A-section light transmission hole 11 and the B-section light transmission hole 12 through glue, respectively, and the B-section light transmission hole 12 is arranged in an open manner, which facilitates the adjustment of the installation position of the self-focusing lens 40.
[0035] As shown in Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , the light transmission hole in the embodiment is arranged in eight, and the eight light transmission holes are arranged in two groups of matrixes inside the MT ferrule 10, and the MT cover plate 20 is provided with two corresponding two groups of light transmission holes; that is, the MT expansion contact in the embodiment can integrate 8 optical signals at most, and each uses an independent expansion structure, which meets the high-density requirement of the MT expansion contact.
[0036] In order to improve the convenience of the MT expansion contact assembly in the technical solution, as shown in Figure 4 ,Figure 5 , Figure 6 As shown in the figure, the MT cover plate 20 is provided with a guide groove 21, and the MT ferrule 10 is provided with a guide boss 16 at the opening, and the guide boss 16 is matched with the guide groove 21. When the MT ferrule 10 is assembled with the MT cover plate 20, the guide boss 16 is inserted into the inside of the guide groove 21, which facilitates the positioning and assembly of the product.
[0037] Further, as shown in the figure, Figure 4 The self-focusing lens 40 is double-sided coated, which reduces the inherent insertion loss of the contact, thereby improving the optical signal transmission efficiency and prolonging the transmission distance. At the same time, the coupling end of the self-focusing lens 40 and the ceramic ferrule 50 is arranged in an octant, which improves the return loss of the contact, thereby reducing the influence of reflected light on the light source and the system. Further, the optical performance consistency of the MT expansion contact is ensured, which is suitable for high-speed signal transmission. In the vibration and impact environment, good optical performance can improve the reliability of the MT contact and ensure the stable transmission of the optical signal.
[0038] As shown in the figure, Figure 1 , Figure 3 , Figure 4 , Figure 5 The first end of the MT ferrule 10 is provided with a concave surface 15, and the end surface of the focusing lens 40 after assembly is flush with the concave surface 15. This can effectively ensure that the self-focusing lens 40 does not contact when the two MT expansion contacts are connected, thereby reducing the wear of the connection surface and improving the plugging life of the connector.
[0039] As shown in the figure, Figure 1 , Figure 2 , Figure 4 A new type of miniaturized high-density metal MT expansion contact further includes a guide seat 30 for supporting the assembled spring, the guide seat 30 is assembled with the tail end of the MT ferrule 10 and the MT cover plate 20, and the guide seat 30 cooperates with the MT ferrule 10 and the MT cover plate 20 to form the contact, and the single-mode optical fiber 60 penetrates the guide seat 30.
[0040] As shown in the figure, Figure 1 , Figure 2 , Figure 4 The MT ferrule 10 is provided with a guide through hole one 14, and the guide seat 30 is provided with a guide through hole two 31; the guide needle 70 is interference-fitted with the guide through hole one 14, and the guide needle 70 is interference-fitted with the MT ferrule 10, which is beneficial to improve the positioning accuracy of the guide needle 70, one end of the guide needle 70 extends into the inside of the guide through hole two 31 and cooperates with the gap, the guide seat 30 is used for supporting the assembled spring, improving the anti-vibration ability of the new type of miniaturized high-density metal MT expansion contact in the technical solution, and improving the reliability of the product.
[0041] To ensure the stability of the single-mode optical fiber 60 after assembly, as shown in Figure 4 , Figure 5 , Figure 6 A new type of miniaturized high-density metal MT expansion contact also includes a mounting groove 13 that penetrates all the light transmission holes and the guide seat 30, the mounting groove 13 is distributed on the MT ferrule 10 and the MT cover plate 20, and the single-mode optical fiber 60 is fixed in the interior of the mounting groove 13 by the glue 80; wherein the glue 80 adopts 353ND.
[0042] The above examples are only used to illustrate the technical solutions of the present application, and not to limit them.
Claims
1. A novel miniaturized high-density metal MT expansion contact comprising an MT ferrule (10) characterized in that, The MT ferrule (10) is provided with a light passing hole perpendicular to the end face of the MT ferrule (10), and the light passing hole is sequentially fitted with a self-focusing lens (40) for light spot amplification, a ceramic ferrule (50) coupled with the self-focusing lens (40), and a single-mode optical fiber (60) fixed on the ceramic ferrule (50). The MT ferrule (10) is provided with an opening, and the opening is detachably mounted with an MT cover plate (20). The light passing hole is provided with an A-section light passing hole (11) and a B-section light passing hole (12) connected in series. The B-section light passing hole (12) is distributed on the MT ferrule (10) and the MT cover plate (20).
2. A novel miniaturized high-density metal MT contact, according to claim 1, characterized by, The two ends of the self-focusing lens (40) are fixed in the A-section light passing hole (11) and the B-section light passing hole (12) by glue, respectively.
3. A novel miniaturized high-density metal MT contact according to claim 1, characterized in that, The light passing hole is provided with eight light passing holes, which are distributed in two groups in the MT ferrule (10) in a matrix form. The MT cover plate (20) is provided with two corresponding light passing holes.
4. A novel miniaturized high-density metal MT contact according to claim 1, characterized by, The MT ferrule (10) is provided with a guiding groove (21) on the MT cover plate (20). The opening of the MT ferrule (10) is provided with a guiding boss (16). The guiding boss (16) is matched with the guiding groove (21).
5. A novel miniaturized high-density metal MT contact according to claim 1, characterized by, The MT ferrule (10) is made of metal.
6. A novel miniaturized high-density metal MT contact according to claim 1, characterized by, The self-focusing lens (40) is double-sided coated. The coupling end of the self-focusing lens (40) and the ceramic ferrule (50) is provided with an eight-degree slope.
7. A novel miniaturized high-density metal MT contact according to claim 1, characterized by, The first end of the MT ferrule (10) is provided with a concave surface (15). The end face of the focusing lens (40) after assembly is flush with the concave surface (15).
8. A novel miniaturized high-density metal MT contact according to claim 1, characterized by, A guiding seat (30) for supporting the assembled spring is further included. The guiding seat (30) is matched with the MT ferrule (10) and the MT cover plate (20) to form a contact piece. The single-mode optical fiber (60) penetrates the guiding seat (30).
9. A novel miniaturized high-density metal MT contact according to claim 8, characterized by, The MT ferrule (10) is provided with a guiding through hole one (14). The guiding seat (30) is provided with a guiding through hole two (31). The guiding through hole one (14) is fitted with a guiding needle (70) in interference. One end of the guiding needle (70) extends into the interior of the guiding through hole two (31) and cooperates with the gap.
10. A novel miniaturized high-density metal MT contact according to claim 9, characterized by, An installation groove (13) penetrating all the light passing holes and the guiding seat (30) is further included. The installation groove (13) is distributed on the MT ferrule (10) and the MT cover plate (20). The single-mode optical fiber (60) is fixed in the interior of the installation groove (13) by glue (80).