A coupling processing technology based on plastic optical fiber

Abstract

A coupling processing technology based on plastic optical fiber, which relates to the field of optical fiber communication technology, and specifically relates to the improvement of the coupling processing method of optical modules. It solves the technical deficiencies of the high cost and process technology of existing optical fiber modules. The processing technology is based on plastic optical fiber, and the structural parts are made of light-shielding plastic parts and high-temperature-resistant materials that can withstand 200 °C; a V-shaped groove with a 45-degree angle is provided on the top surface of the structural part. The plastic optical fiber to be coupled is inserted from the side wall of the structural part into the plastic optical fiber insertion fixing hole, and the end is exposed into the V-shaped groove. A V-shaped hot pressing block is used to hot press the end of the plastic optical fiber exposed in the V-shaped groove to form a 45-degree mirror angle surface that can achieve total internal reflection of light. Compared with the traditional coupling scheme through coupling lenses, it has low cost and simple process, and solves the problem of popularization and application of optical fiber optical modules.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber communication, and particularly to an improvement in the coupling processing method of an optical module. Background Art

[0002] In the consumer data transmission product market, such as HDMI and Type-C, it is mainly a copper core market. The fiber optic transmission module occupies a small market share in high-end applications or foreign markets. At present, the performance of HDMI 2.1 has been increased several times, with a maximum bandwidth of 48 Gbps, supporting video transmission with resolutions and refresh rates such as 4K / 120Hz, 8K / 60Hz, and 10K, which will promote the application of fiber optic transmission modules. Currently, the cost and process technology of fiber optic modules are both very high. Summary of the Invention

[0003] The purpose of the present invention is to solve the technical deficiencies of the high cost and process technology of existing fiber optic modules, and to propose a coupling processing technology based on plastic optical fiber.

[0004] To solve the technical deficiencies proposed by the present invention, the technical solution adopted is as follows:

[0005] A coupling processing technology based on plastic optical fiber, characterized in that the processing technology is based on plastic optical fiber, the structural member is made of a light-shielding plastic part and a high-temperature material resistant to 200 °C; a V-shaped groove with a 45-degree angle is provided on the top surface of the structural member, positioning posts are provided on the bottom surface, a plastic optical fiber insertion and fixing hole vertically penetrating to the V-shaped groove is provided on the side wall of the structural member, and an optical path channel hole vertically penetrating to the V-shaped groove and vertically intersecting with the plastic optical fiber insertion and fixing hole is provided at the bottom of the structural member; the plastic optical fiber to be coupled is inserted from the side wall of the structural member into the plastic optical fiber insertion and fixing hole, and the end is exposed into the V-shaped groove, and the structural member is placed in a hot melt adhesive jig for positioning and fixing; then, a V-shaped hot pressing block matching the V-shaped groove is used to hot press the end of the plastic optical fiber exposed in the V-shaped groove. The temperature used during hot pressing is lower than the melting point temperature of the structural member and higher than the temperature of the plastic optical fiber, and the end of the plastic optical fiber is hot pressed to form a 45-degree mirror angle surface that can achieve total internal reflection of light. The 45-degree mirror angle surface totally reflects the outgoing light from the end of the plastic optical fiber and exits the light from the side wall of the plastic optical fiber, and is coupled with the optical receiver on the bottom surface of the structural member through the optical path channel hole; or the light from the light emitter on the bottom surface of the structural member enters the light from the side wall of the plastic optical fiber through the optical path channel hole and is totally reflected through the 45-degree mirror angle surface and output through the plastic optical fiber.

[0006] The technical features for further limiting the present invention include:

[0007] The selected plastic optical fiber has a melting point temperature of 160 °C, and the hot pressing temperature of the V-shaped hot pressing block is: 175 °C.

[0008] The side wall of the structural member is provided with more than two plastic optical fiber insertion and fixing holes. The axial distance between adjacent plastic optical fibers is 0.75 mm, and the diameter of the plastic optical fiber is selected to be 500 um.

[0009] The beneficial effects of the present invention are as follows: The plastic optical fiber of the present invention is thermally pressed and combined with the structural member of the light-shielding plastic part. While thermally pressing and combining, the plastic optical fiber is thermally riveted and fixed, and a 45-degree mirror angle surface for total internal reflection of light is formed. Compared with the traditional coupling scheme realized by a coupling lens, it has low cost, simple process, and solves the problem of popularization and application of optical fiber optical modules. Brief Description of the Drawings

[0010] Figure 1 is a schematic diagram of the existing parallel array coupling lens structure;

[0011] Figure 2 is a coupling simulation diagram of the existing OM series optical fiber type with a core diameter of 50 um;

[0012] Figure 3 is a coupling simulation diagram of the existing plastic optical fiber with a core diameter of 300 um;

[0013] Figure 4 is a schematic top view structure diagram of the optical module processed by the coupling processing technology of the present invention;

[0014] Figure 5 is the RX optical path diagram of the optical module of the present invention;

[0015] Figure 6 is the TX optical path diagram of the optical module of the present invention;

[0016] Figure 7 is a schematic cross-sectional structure diagram of the optical module of the present invention;

[0017] Figure 8 is a schematic structure diagram of the optical module of the present invention during thermal pressing. Detailed Embodiments

[0018] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and the preferred specific embodiments of the present invention.

[0019] Referring to Figure 1 As shown in , in the existing parallel array coupling lens, generally, the optical fiber 1 is coupled with the array coupling lens 2. The parallel array coupling lens has a V-shaped groove; the light emitted by the emitting laser 3 is coupled to the first lens 21 on the bottom surface of the parallel array coupling lens 2. After being collimated by the first lens 21, the light undergoes total internal reflection at the side wall of the V-shaped groove in the parallel array coupling lens 2 to form a 90-degree fold angle, and is focused from the second lens 22 to the end face of the optical fiber 1 to complete the high-precision alignment coupling at the TX end; during the coupling at the RX end, the principle is the same and the optical path is opposite. The existing structure is complex, the process requirements are high, and the cost is high.

[0020] Referring to Figure 2 As shown, for the optical fiber used in the transmission of consumer optical modules, multimode optical fiber of the OM series is mostly adopted, and the core diameter a of the optical fiber is 50 / 125um and 62.5 / 125um; the minimum distance b of the design focus is 0.40mm, the aspherical aperture c is 0.25mm, and the divergence angle d is 22 degrees. Referring to Figure 3 As shown in, the core diameter a of the plastic optical fiber includes 200um, 250um, 300um, 350um, 400um, 450um and 500um; when the core diameter of the plastic optical fiber is 300um, the minimum distance b of the design focus is 1.50mm, the aspherical aperture c is 3.15mm, and the divergence angle d is 74 degrees. And the present invention selects a plastic optical fiber with a core diameter of 500um, and the advantages are: the large core diameter brings a large theoretical coupling tolerance, and the characteristics of strong anti-bending and anti-tensile strength.

[0021] Referring to Figures 3 to 8 As shown in, the coupling processing technology of the present invention based on plastic optical fiber is based on plastic optical fiber 1, and the structural member 2 is made of a light-shielding plastic part and a high-temperature-resistant material that can withstand 200°C; a V-shaped groove 23 with a 45-degree angle is provided on the top surface of the structural member 2, positioning posts 24 are provided on the bottom surface, and a plastic optical fiber insertion and fixing hole 25 that vertically penetrates to the V-shaped groove 23 is provided on the side wall of the structural member 2. An optical path channel hole 26 that vertically penetrates to the V-shaped groove 23 and is perpendicular to the plastic optical fiber insertion and fixing hole 25 is provided at the bottom of the structural member 2; the plastic optical fiber 1 to be coupled is inserted from the side wall of the structural member 2 into the plastic optical fiber insertion and fixing hole 25, and the end is exposed to the V-shaped groove, and the structural member 2 is placed in a hot melt adhesive jig for positioning and fixing; then, a V-shaped hot pressing block 4 that fits the V-shaped groove 23 is used to hot press the end of the plastic optical fiber exposed to the V-shaped groove; the inclined surface of the V-shaped hot pressing block 4 is a mirror surface structure, and the end of the plastic optical fiber 1 is hot pressed to form a 45-degree mirror angle surface that can achieve total internal reflection of light, that is, the outgoing light of the plastic optical fiber end is totally internally reflected from the side wall of the plastic optical fiber through the 45-degree mirror angle surface 11 and is coupled with the optical receiver 5 at the bottom surface of the structural member through the optical path channel hole; or the light from the light emitter on the bottom surface of the structural member 2 enters the plastic optical fiber from the side wall through the optical path channel hole and is totally internally reflected through the 45-degree mirror angle surface and output through the plastic optical fiber. It is equivalent to using the end structure of the plastic optical fiber 1 as the function of a coupling lens, and the structural member 2 is only used for positioning and installing the plastic optical fiber 1; during the hot pressing process, the molten plastic optical fiber material fills the triangular area of the optical path channel hole 26 to form a hot pressing expansion riveting surface 12 of the plastic optical fiber, so as to prevent loosening and falling off between the plastic optical fiber 1 and the structural member 2.

[0022] In order to ensure that the V-shaped hot pressing block 4 can hot press a 45-degree mirror angle surface 11 on the plastic optical fiber 1 without causing damage and deformation to the structural member, the temperature used during hot pressing is lower than the melting point temperature of the structural member and higher than the temperature of the plastic optical fiber. Since the plastic optical fiber 1 selected in the present invention is a plastic optical fiber with a melting point temperature of 160 °C, the preferred hot pressing temperature of the V-shaped hot pressing block 4 is: 175 °C. The core diameter a of the plastic optical fiber of the present invention includes 200um, 250um, 300um, 350um, 400um, 450um and 500um, and is preferably: 500um.

[0023] When the present invention needs to perform coupling processing on multiple plastic optical fibers 1, two or more plastic optical fiber insertion and fixing holes are provided on the side wall of the structural member 2, and one plastic optical fiber 1 is inserted into each plastic optical fiber insertion and fixing hole, and the axial center distance e between adjacent plastic optical fibers is 0.75 mm.

Claims

1. A coupling processing technology based on plastic optical fiber, characterized in that the processing technology is based on plastic optical fiber, the structural part is made of light-shielding plastic parts and high-temperature-resistant materials that can withstand 200°C; a V-shaped groove with a 45-degree angle is provided on the top surface of the structural part, positioning posts are provided on the bottom surface, and a plastic optical fiber insertion and fixing hole that vertically penetrates to the V-shaped groove is provided on the side wall of the structural part. An optical path channel hole that vertically penetrates to the V-shaped groove and is perpendicular to the plastic optical fiber insertion and fixing hole is provided at the bottom of the structural part; the plastic optical fiber to be coupled is inserted from the side wall of the structural part into the plastic optical fiber insertion and fixing hole, and the end is exposed to the V-shaped groove, and the structural part is placed in a hot melt adhesive jig for positioning and fixing; then, a V-shaped hot pressing block that fits the V-shaped groove is used to hot press the end of the plastic optical fiber exposed to the V-shaped groove. The temperature used during hot pressing is lower than the melting point temperature of the structural part and higher than the temperature of the plastic optical fiber. The end of the plastic optical fiber is hot pressed to form a 45-degree mirror angle surface that can achieve total internal reflection of light. The 45-degree mirror angle surface totally reflects the outgoing light from the end of the plastic optical fiber and emits light from the side wall of the plastic optical fiber, and is coupled with the optical receiver on the bottom surface of the structural part through the optical path channel hole; or the light from the light emitter on the bottom surface of the structural part enters the plastic optical fiber from the side wall through the optical path channel hole and is output through the plastic optical fiber after total reflection by the 45-degree mirror angle surface.

2. A coupling processing technology based on plastic optical fiber according to claim 1, characterized in that: the plastic optical fiber selected is a plastic optical fiber with a melting point temperature of 160°C, and the hot pressing temperature of the V-shaped hot pressing block is: 175°C.

3. A coupling processing technology based on plastic optical fiber according to claim 1, characterized in that: two or more plastic optical fiber insertion and fixing holes are provided on the side wall of the structural part, the center distance between adjacent plastic optical fibers is 0.75 mm, and the diameter of the plastic optical fiber is selected to be 500 um.

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