Optical structure capable of increasing return loss
By designing oblique end-face and reflective surface structures in the optical fiber connection device, the return loss problem caused by the flat optical fiber end-face is solved, thereby increasing the return loss and optimizing the optical signal transmission performance.
Patent Information
- Application Number
- CN202423311072.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing fiber optic connection devices, the fiber end face and the lens matching surface are flat, resulting in high return loss that easily exceeds specifications, affecting the optical signal transmission performance.
The fiber end face is designed as an angled end face, and the light is reflected to the focusing lens through the angled reflective surface, and finally focused on the PD chip. The lens body is integrally injection molded to fix the fiber. The fiber optic jack has an inner connecting angled surface that is aligned with the fiber end face.
The return loss is increased to 45.8dB, optimizing optical signal transmission performance. The structure is simple and easy to manufacture, meeting application requirements.
Smart Images
Figure CN223857442U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical fiber connecting device especially relates to a kind of optical structure that can increase echo loss. BACKGROUND
[0002] Optical fiber connecting device is usually applied in laser communication device, high-speed optical module, and it is the core component of this kind of equipment, and the working principle of optical fiber connecting device is that the light returned by optical fiber is collimated after passing through plastic lens or glass lens, and then reflected, and then focused on the light-receiving PD chip, and the PD chip and the electric chip convert the optical signal into electrical signal, and then perform signal analysis. The optical structure in the prior art is generally used in high-speed optical module, as shown in FIG. 1, because the mold processing technology cannot be made into an inclined surface, so the end face of the optical fiber and the matching surface of the lens are usually processed into a flat shape. In this structure, the front end of the optical fiber end face has a small plastic optical plane, which is originally designed as a plane. Therefore, it is impossible to avoid the reflection of part of the light energy, so the echo loss is about -30.5DB. Although the echo loss can be controlled within the specification range, the echo loss parameter is close to the limit. Once the connection process deviates slightly, the return loss will exceed the specification, thereby affecting the optical signal transmission performance. Figure 4 SUMMARY The utility model provides a kind of optical structure that can increase echo loss, and the structure is simple and easy to implement.
[0003] The technical problem to be solved by the utility model is to provide an optical structure that can increase echo loss, while the structure is simple and easy to implement.
[0004] To solve the above technical problems, the utility model adopts the following technical solutions.
[0005] An optical structure that can increase echo loss includes a lens body, an optical fiber, and a PD chip. The rear side of the lens body is provided with a fixing port. The main body of the optical fiber is fixed in the fixing port. The front side wall of the fixing port is provided with an optical fiber insertion hole. The front end of the optical fiber is inserted into the optical fiber insertion hole. The lens body includes a top opening. The bottom of the top opening is provided with an inclined reflection surface. The bottom of the lens body is provided with a focusing lens. The PD chip is located below the focusing lens and is aligned with the focusing lens. The front end of the optical fiber forms an inclined end surface. The hole bottom of the optical fiber insertion hole forms an internal connecting inclined surface. The optical signal transmitted in the optical fiber passes through the inclined end surface and is reflected to the focusing lens through the inclined reflection surface. The optical signal is focused on the PD chip through the focusing lens.
[0006] Preferably, the included angle between the inclined end surface and the axis of the optical fiber is 4° to 10°.
[0007] Preferably, the front side wall of the fixing port is provided with a plurality of optical fiber insertion holes, and a plurality of optical fibers are fixed in the fixing port, and the optical fibers correspond to the optical fiber insertion holes one by one.
[0008] Preferably, the bottom of the lens body is provided with a plurality of focusing lenses, and the focusing lenses correspond to the optical fiber insertion holes one by one.
[0009] Preferably, the bottom of the lens body is provided with a plurality of focusing lenses, and the focusing lenses correspond to the optical fiber insertion holes one by one.
[0010] Preferably, the bottom of the lens body is provided with a plurality of focusing lenses, and the focusing lenses correspond to the optical fiber insertion holes one by one.
[0011] Preferably, the rear end of the optical fiber insertion hole is formed with a wide mouth portion, and glue for fixing the optical fiber is arranged in the wide mouth portion.
[0012] In the optical structure capable of increasing return loss disclosed by the utility model, the lens body can be integrally injection molded, the rear end of the lens body has a fixing port for fixing the optical fiber, the optical fiber insertion hole of the front side wall of the fixing port has an inner connecting inclined surface, the front end of the optical fiber matched with the inner connecting inclined surface is formed with an inclined end face, the inclined end face is aligned with the inner connecting inclined surface, so that the optical signal is shot to the inclined reflection surface after passing through the inclined end face, is reflected to the focusing lens by the inclined reflection surface, and is finally focused on the PD chip by the focusing lens. In order to improve and improve the return loss of the optical fiber, the utility model cuts the optical fiber end face at a certain angle by laser, inserts the optical fiber into the optical fiber insertion hole according to the designed optical fiber direction, and pushes to the specified position. Compared with the prior art, the utility model is based on the above structure, which can increase the return loss, is easy to process, the overall structure is simpler, and the application requirement is better met. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a perspective view of the optical structure of the utility model;
[0014] Figure 2 It is a sectional view of Figure 1
[0015] Figure 3 It is a light path schematic view of the optical structure of the utility model;
[0016] Figure 4 It is a light path schematic view of the existing optical structure. DETAILED DESCRIPTION
[0017] The utility model will be described in more detail in combination with the drawings and examples.
[0018] The utility model discloses an optical structure that can increase return loss, which is combined with Figures 1 to 3 As shown in the figure, it comprises a lens body 1, an optical fiber 2 and a PD chip 3, the rear side of the lens body 1 is provided with a fixing port 10, the main body part of the optical fiber 2 is fixed in the fixing port 10, the front side wall of the fixing port 10 is provided with an optical fiber jack 11, the front end of the optical fiber 2 is inserted into the optical fiber jack 11, the lens body 1 comprises a top opening 12, the bottom of the top opening 12 is provided with an oblique reflecting surface 13, the bottom of the lens body 1 is provided with a focusing lens 14, the PD chip 3 is arranged below the focusing lens 14 and the two are aligned with each other, the front end of the optical fiber 2 forms an oblique end surface 20, the hole bottom of the optical fiber jack 11 forms an inner connecting inclined surface 16, the optical signal transmitted in the optical fiber 2 is shot to the oblique reflecting surface 13 after passing through the oblique end surface 20, is reflected to the focusing lens 14 through the oblique reflecting surface 13, and is focused on the PD chip 3 through the focusing lens 14.
[0019] In the above structure, the lens body 1 can be integrally injection molded, the rear end of the lens body 1 is provided with the fixing port 10 for fixing the optical fiber 2, the optical fiber jack 11 of the front side wall of the fixing port 10 is provided with the inner connecting inclined surface 16, the front end of the optical fiber 2 that matches the inner connecting inclined surface 16 is formed with the oblique end surface 20, the oblique end surface 20 is aligned with the inner connecting inclined surface 16, so as to ensure that the optical signal passes through the oblique end surface 20, then passes through the inner connecting inclined surface 16 and is shot to the oblique reflecting surface 13, is reflected to the focusing lens 14 through the oblique reflecting surface 13, and is finally focused on the PD chip 3 through the focusing lens 14. In order to improve and improve the return loss of the optical fiber, the utility model cuts the optical fiber end face a certain angle by laser, inserts the optical fiber into the optical fiber jack 11 according to the designed optical fiber direction, and pushes to the specified position. Compared with the prior art, the utility model based on the above structure can increase the return loss, is easy to process, the overall structure is simpler, and the application requirement is better met.
[0020] In the embodiment, the inclination angle of the oblique end surface 20 needs to be specially designed, please refer to Figure 2 The included angle between the oblique end surface 20 and the axis line of the optical fiber 2 is 4°-10°.
[0021] Please refer to Figure 1 In the embodiment, the lens body 1 needs to be installed with multiple optical fibers, specifically, the front side wall of the fixing port 10 is provided with multiple optical fiber jacks 11, multiple optical fibers 2 are fixed in the fixing port 10, and the optical fiber 2 corresponds to the optical fiber jack 11 one by one.
[0022] Correspondingly, the bottom of the lens body 1 is provided with a plurality of focusing lenses 14 corresponding to the optical fiber jacks 11.
[0023] In the above structure, the rear end of the optical fiber jack 11 is formed with a wide mouth portion 17, and glue for fixing the optical fiber 2 is arranged in the wide mouth portion 17.
[0024] In the embodiment, the PD chip 3 can be fixed on a preset PCB board. Figure 2 In order to accommodate the PCB board and the PD chip 3, please refer to
[0025] The optical structure disclosed by the utility model, in order to promote and improve the return loss of optical fiber, first laser cutting 6 to 10 degree angle of optical fiber end face, according to the designed optical fiber direction, insert the optical fiber into the plastic lens small hole, and push to the designated position, then point glue in the shadow area, stick the optical fiber and plastic lens together, then can be normally coupled to PCBA. When there is optical signal transmission in the optical fiber, the optical signal is inclined to the light receiving chip PD after passing through the lens body at a certain angle, so as to achieve the purpose of optimizing the return loss of the PD surface. Compared with the prior art, the utility model changes the bottom surface of the optical fiber hole into an 8-degree inclined surface, solves the problem of machining the inclined surface from the mold processing technology, optimizes the return loss to 45.8DB, can make the return loss reach the best, and then meet the application requirement.
[0026] The above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, and the modification, equivalent replacement or improvement made within the technical range of the utility model should be included in the range protected by the utility model.
Claims
1. An optical structure capable of increasing return loss, characterized by, Including have lens body (1), optical fiber (2) and PD chip (3), the rear side of lens body (1) is provided with fixed mouth (10), the main part of optical fiber (2) is fixed in fixed mouth (10), the front side wall of fixed mouth (10) is provided with optical fiber jack (11), the front end of optical fiber (2) is inserted in optical fiber jack (11), lens body (1) includes top opening (12), the bottom of top opening (12) is equipped with oblique reflection surface (13), the bottom of lens body (1) is equipped with focusing lens (14), PD chip (3) is located below focusing lens (14) and both mutually align, the front end of optical fiber (2) is formed with oblique end face (20), the hole bottom of optical fiber jack (11) is formed with inner connecting inclined surface (16), the light signal transmission in optical fiber (2) is shot to oblique reflection surface (13) after passing through oblique end face (20), again is reflected to focusing lens (14) through oblique reflection surface (13), is focused on PD chip (3) through focusing lens (14).
2. The optical structure of claim 1, wherein, The included angle between oblique end face (20) and the axis line of optical fiber (2) is 4 ° ~ 10 °.
3. The optical structure of claim 1, wherein, The front side wall of fixed mouth (10) is provided with a plurality of optical fiber jacks (11), a plurality of optical fibers (2) are fixed in fixed mouth (10), and the optical fibers (2) correspond to the optical fiber jacks (11) one by one.
4. The optical structure of claim 3, wherein the first and second dielectric layers are formed of a material having a dielectric constant of at least 2.
5. The bottom of lens body (1) is provided with a plurality of focusing lenses (14), and the focusing lenses (14) correspond to the optical fiber jacks (11) one by one.
5. The optical structure of claim 4, wherein the first and second dielectric layers are formed of a material having a dielectric constant of at least 2.
5. The bottom of lens body (1) is provided with a plurality of focusing lenses (14), and the focusing lenses (14) correspond to the optical fiber jacks (11) one by one.
6. The optical structure of claim 1, wherein, The bottom of lens body (1) is provided with a plurality of focusing lenses (14), and the focusing lenses (14) correspond to the optical fiber jacks (11) one by one.
7. The optical structure of claim 1, wherein, The bottom of lens body (1) is formed with containing mouth (15), and the PD chip (3) is arranged in the containing mouth (15), and the focusing lens (14) is formed on the top wall of containing mouth (15). The rear end of optical fiber jack (11) is formed with wide mouth (17), and the wide mouth (17) is provided with glue for fixing optical fiber (2).