A multimode skew pin lens with high coupling tolerance

Abstract

The utility model provides a kind of multimode inclined PIN lens with high coupling tolerance, including lens base body, Vcsel laser and multimode optical fiber, the lens base body has incident light surface and emergent light surface, the Vcsel laser is correspondingly arranged with the incident light surface of the lens base body, the multimode optical fiber is adaptively connected with the emergent light surface of the lens base body, and the optical axis of the multimode optical fiber is arranged with the emergent light optical axis of the lens base body with certain inclination angle α. The utility model is arranged with certain inclination angle between the optical axis of multimode optical fiber and the emergent light optical axis of lens base body, so that the receiving cone of multimode optical fiber is horizontal, to solve the problem that the receiving cone center line of existing inclined optical fiber deviates from optical fiber horizontal axis to form an included angle, so as to achieve the purpose of expanding coupling tolerance.

Description

Technical Field

[0001] This invention belongs to the field of optical communication device technology, specifically relating to a multimode angled PIN lens with high coupling tolerance. Background Technology

[0002] In fiber optic communication and optoelectronic systems, the coupling efficiency between optical fibers and optical components is one of the core indicators determining system performance. Multimode fiber, with its large core diameter and numerical aperture, is widely used in short-distance, high-capacity communication and data center interconnection scenarios. As a key component for achieving efficient coupling between optical fibers and active / passive optical devices, the structural design of the PIN lens directly affects the efficiency, tolerance, and reliability of the coupling system.

[0003] In existing technologies, multimode lenses generally employ a structure where multimode fibers are arranged parallel to the horizontal plane. This traditional structure has a significant drawback when used with the inclined fiber 1: the center line of the receiving cone of the inclined fiber 1 forms an angle with the horizontal axis of the fiber. Typically, for an 8-degree inclined fiber 1, the angle between the center line of its receiving cone and the horizontal axis of the fiber is 3.88°. Figure 1 As shown, in order to adapt to this angle, the axis of the incident light will be deviated from the axis of lens 2, which will result in a significant reduction in the product's coupling tolerance. Utility Model Content

[0004] The purpose of this invention is to provide a multimode angled PIN lens with high coupling tolerance, which can at least solve some of the defects existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multimode angled PIN lens with high coupling tolerance includes a lens substrate, a VCSEL laser, and a multimode fiber. The lens substrate has an incident light surface and an exit light surface. The VCSEL laser is arranged corresponding to the incident light surface of the lens substrate. The multimode fiber is adapted to the exit light surface of the lens substrate, and the optical axis of the multimode fiber is arranged at a certain tilt angle α with the exit light optical axis of the lens substrate.

[0007] Furthermore, the tilt angle α is 3 to 4°.

[0008] Furthermore, the aforementioned multimode angled PIN lens with high coupling tolerance also includes an optical fiber positioning component for tilting the optical axis of the multimode optical fiber relative to the outgoing optical axis of the lens substrate.

[0009] Furthermore, the fiber positioning assembly includes an MT ferrule for fixing the multimode fiber and a lens PIN post disposed on the light-emitting surface of the lens substrate. The angle between the axis of the lens PIN post and the light-emitting axis of the lens substrate is α. The MT ferrule is provided with a connection hole for fixed connection with the lens PIN post. The axis of the connection hole is parallel to the light-emitting axis of the multimode fiber.

[0010] Furthermore, the lens PIN post is integrally formed with the lens substrate.

[0011] Furthermore, the lens substrate is provided with a limiting block for limiting the installation of the MT ferrule.

[0012] Furthermore, the incident light surface of the lens substrate is located on the bottom surface of the lens substrate, the exit light surface of the lens substrate is located on one side of the lens substrate, and the lens substrate is provided with a lens optical reflecting surface for the optical path between the incident light surface and the exit light surface for total internal reflection.

[0013] Furthermore, a first groove is formed on the upper surface of the lens substrate, and the side wall of the first groove near the light-emitting surface is inclined, serving as the optical reflecting surface of the lens.

[0014] Furthermore, the bottom of the lens substrate has a second groove formed by the inward indentation of the lower surface of the lens substrate, and the Vcsel laser is placed in the second groove.

[0015] Furthermore, the lens substrate is integrally injection molded from resin material.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention designs the optical axis of the multimode fiber to be arranged at a certain tilt angle with the output optical axis of the lens substrate, thereby making the receiving cone of the multimode fiber horizontal. This solves the problem of the center line of the receiving cone of the existing inclined fiber deviating from the horizontal axis of the fiber, thus achieving the purpose of expanding the coupling tolerance.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a traditional multimode fiber paired with a lens;

[0020] Figure 2 This is a schematic diagram of the structure of the multimode angled PIN lens in an embodiment of this utility model;

[0021] Figure 3This is a schematic diagram of a multimode oblique PIN lens structure with an optical fiber positioning component in an embodiment of this utility model;

[0022] Figure 4 This is a front view of the multimode oblique PIN lens in an embodiment of this utility model;

[0023] Figure 5 This is a comparison diagram of the optical coupling tolerances of a traditional multimode lens and a multimode oblique PIN lens in this embodiment.

[0024] Explanation of reference numerals in the attached diagram: 1. Inclined fiber; 2. Lens; 3. Lens substrate; 4. Lens pin post; 5. Multimode fiber; 6. Limiting block; 7. First groove; 8. MT ferrule; 9. Connecting hole; 10. Lens optical reflecting surface; 11. VCSEL laser; 12. Second groove. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, abutting connections, or integral connections. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] like Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a multimode angled PIN lens with high coupling tolerance, including a lens substrate 3, a VCSEL laser 11, and a multimode fiber 5. The lens substrate 3 has an incident light surface and an exit light surface. The VCSEL laser 11 is arranged corresponding to the incident light surface of the lens substrate 3. The multimode fiber 5 is adapted to the exit light surface of the lens substrate 3, and the optical axis of the multimode fiber 5 is arranged at a certain tilt angle α with the exit light optical axis of the lens substrate 3. The multimode fiber 5 is an angled fiber (i.e., the fiber end face is angled). The incident light surface of the lens substrate 3 has a first lens for collimating the light emitted from the VCSEL laser 11 incident on the lens substrate 3. The exit light surface of the lens substrate 3 has a second lens for focusing the light emitted from the lens substrate 3 to couple it into the multimode fiber 5. In this embodiment, by designing the optical axis of the multimode fiber 5 to be arranged at a certain tilt angle with the optical axis of the emitted light from the lens substrate 3, the receiving cone of the multimode fiber 5 is horizontal, that is, the center line of the receiving cone of the multimode fiber 5 coincides with the horizontal axis of the fiber. This overcomes the problem of reduced product coupling tolerance caused by the deviation of the center line of the receiving cone of the existing inclined fiber from the horizontal axis of the fiber. Therefore, the multimode inclined PIN lens designed in this embodiment has high coupling tolerance.

[0030] Specifically, the tilt angle α is designed to be 3 to 4°. For example, when the multimode fiber 5 is an 8-degree inclined fiber, the tilt angle α is designed to be 3.88°, that is, the multimode fiber 5 is twisted 3.88° relative to the horizontal plane to adapt to the angle between the center line of its receiving cone and the horizontal axis of the fiber when the 8-degree inclined fiber is arranged horizontally in the prior art. In this way, the receiving cone of the multimode fiber 5 is horizontal, and the light is at the center of the second lens of the lens substrate 3, thereby increasing the coupling tolerance.

[0031] Optionally, the lens substrate 3 is integrally injection molded from resin material, which can be mass-produced, greatly reducing costs and improving production efficiency.

[0032] In some embodiments, the tilting of the optical axis of the multimode fiber 5 relative to the emitted optical axis of the lens substrate 3 can be achieved by designing an optical fiber positioning component. Specifically, for example... Figure 2 and Figure 3As shown, the fiber positioning assembly includes an MT ferrule 8 and a lens PIN post 4. The MT ferrule 8 has core holes corresponding to the positioning of the multimode fiber 5, and the number of core holes is the same as the number of multimode fibers 5. The lens PIN post 4 is disposed on the light-emitting surface of the lens substrate 3, and the angle between the axis of the lens PIN post 4 and the light-emitting axis of the lens substrate 3 is designed to be α. At the same time, a connection hole 9 for fixed connection with the lens PIN post 4 is provided on the MT ferrule 8. The axis of the connection hole 9 is parallel to the light-emitting axis of the multimode fiber 5. Thus, after the MT ferrule 8 is fixedly connected to the lens PIN post 4 on the lens substrate 3 through the connection hole 9, the MT ferrule 8 is tilted at an angle α relative to the light-emitting axis of the lens substrate 3, so that the multimode fiber 5 fixed on the MT ferrule 8 is also tilted at an angle α relative to the light-emitting axis of the lens substrate 3.

[0033] Preferably, the lens PIN post 4 is designed to be integrally formed with the lens substrate 3 to ensure the accuracy of the tilt angle of the optical axis of the multimode fiber 5 and the lens substrate 3, and to further improve the coupling tolerance.

[0034] Optimized implementation methods, such as Figure 3 As shown, the lens substrate 3 is provided with a limiting block 6 for limiting the installation of the MT ferrule 8. Specifically, the limiting block 6 is formed by protruding outward from the light-emitting surface of the lens substrate 3. There are two limiting blocks 6, which are located at both ends of the light-emitting surface of the lens substrate 3, thereby forming a concave groove structure with the light-emitting surface of the lens substrate 3. The end of the MT ferrule 8 is embedded in this concave groove structure, thereby limiting the installation of the MT ferrule 8 and improving the installation efficiency, accuracy and stability of the MT ferrule 8.

[0035] As one specific implementation method, such as Figure 2 , Figure 3 and Figure 4 As shown, the incident light surface of the lens substrate 3 is located on the bottom surface of the lens substrate 3, and the exit light surface of the lens substrate 3 is located on one side of the lens substrate 3. The lens substrate 3 is provided with a lens optical reflecting surface 10 for the optical path between the incident light surface and the exit light surface for total internal reflection. In this embodiment, the first lens, the lens optical reflecting surface 10, and the second lens are all integrated on the lens substrate 3, which reduces the assembly process of their coupling relationship.

[0036] In some embodiments, the lens substrate 3 is generally rectangular in shape, and a first groove 7 is formed on the upper surface of the lens substrate 3. The side wall of the first groove 7 near the light-emitting surface of the lens substrate 3 is designed as an inclined surface, serving as the optical reflecting surface 10 of the lens. At the same time, a second groove 12 is designed at the bottom of the lens substrate 3, which is formed by the inward indentation of the lower surface of the lens substrate 3. The Vcsel laser 11 is placed in the second groove 12. The design of the second groove 12 can protect the Vcsel laser 11 from accidental contact or dust contamination.

[0037] The optical coupling tolerance of the multimode angled PIN lens in this embodiment is compared with that of a traditional multimode lens (i.e., multimode fibers arranged parallel to the horizontal plane), and the results are as follows: Figure 5 As shown; in this embodiment, the multimode angled PIN lens, like the traditional multimode lens, uses an 8-degree angled fiber. The tilt angle α of the multimode angled PIN lens in this embodiment is 3.88°. Figure 5 It can be seen that the multimode angled PIN lens in this embodiment has a higher coupling tolerance than the traditional multimode lens.

[0038] In summary, the multimode oblique PIN lens with high coupling tolerance provided by this utility model is designed to have the optical axis of the multimode fiber and the output optical axis of the lens substrate arranged at a certain oblique angle, thereby making the receiving cone of the multimode fiber horizontal. This solves the problem of the center line of the receiving cone of the existing oblique fiber deviating from the horizontal axis of the fiber, thus achieving the purpose of expanding the coupling tolerance.

[0039] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A multimode angled PIN lens with high coupling tolerance, characterized in that: The device includes a lens substrate, a VCSEL laser, and a multimode fiber. The lens substrate has an incident light surface and an exit light surface. The VCSEL laser is arranged corresponding to the incident light surface of the lens substrate. The multimode fiber is adapted and connected to the exit light surface of the lens substrate, and the optical axis of the multimode fiber is arranged at a certain tilt angle α with the exit light optical axis of the lens substrate.

2. The multimode angled PIN lens with high coupling tolerance as described in claim 1, characterized in that: The tilt angle α is 3 to 4°.

3. The multimode angled PIN lens with high coupling tolerance as described in claim 1 or 2, characterized in that: It also includes an optical fiber positioning component for tilting the optical axis of the multimode optical fiber relative to the outgoing optical axis of the lens substrate.

4. The multimode angled PIN lens with high coupling tolerance as described in claim 3, characterized in that: The fiber positioning assembly includes an MT ferrule for fixing the multimode fiber and a lens PIN post disposed on the light-emitting surface of the lens substrate. The angle between the axis of the lens PIN post and the light-emitting axis of the lens substrate is α. The MT ferrule is provided with a connection hole for fixed connection with the lens PIN post. The axis of the connection hole is parallel to the optical axis of the multimode fiber.

5. The multimode angled PIN lens with high coupling tolerance as described in claim 4, characterized in that: The lens pin is integrally formed with the lens substrate.

6. The multimode angled PIN lens with high coupling tolerance as described in claim 4, characterized in that: The lens substrate is provided with a limiting block for limiting the installation of the MT ferrule.

7. The multimode angled PIN lens with high coupling tolerance as described in claim 1, characterized in that: The incident light surface of the lens substrate is located on the bottom surface of the lens substrate, and the exit light surface of the lens substrate is located on one side of the lens substrate. The lens substrate is provided with a lens optical reflecting surface for the optical path between the incident light surface and the exit light surface for total internal reflection.

8. The multimode angled PIN lens with high coupling tolerance as described in claim 7, characterized in that: The upper surface of the lens substrate is provided with a first groove, and the side wall of the first groove near the light-emitting surface is an inclined surface, which serves as the optical reflecting surface of the lens.

9. The multimode angled PIN lens with high coupling tolerance as described in claim 7, characterized in that: The bottom of the lens substrate has a second groove formed by the inward indentation of the lower surface of the lens substrate, and the Vcsel laser is placed in the second groove.

10. The multimode angled PIN lens with high coupling tolerance as described in claim 1, characterized in that: The lens substrate is integrally injection molded from resin material.

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