阅读说明：本技术 一种转角透镜光纤阵列及其制作方法 (Corner lens optical fiber array and manufacturing method thereof ) 是由 李志远 吴俊� 于 2019-09-10 设计创作，主要内容包括：本发明涉及一种转角透镜光纤阵列及其制作方法,光纤阵列的裸纤端端面为倾斜的光学平面,且所述光学平面上位于纤芯以外区域的前部在竖直平面内切断尖端,并且在切断的断面处形成向前部突出的凸面透镜,且所述凸面透镜的焦点位于光纤的纤芯内。本发明基于光纤阵列可以快速实现光路转角,相比于传统的光纤阵列具有40％-50％的耦合效率,本发明对光纤阵列的端面进行切割处理并形成向前突出的凸面透镜,从而使得光纤阵列的端面具有聚焦功能,大大提高了其耦合效率,可达到60％-70％的耦合效率,满足绝大部分场景应用需求。同时其短交付周期和低前提投入、耐宽温的优势可满足越来越高要求的快速迭代的现代化需求。(The invention relates to a corner lens optical fiber array and a manufacturing method thereof.A bare fiber end face of the optical fiber array is an inclined optical plane, the front part of an area outside a fiber core on the optical plane is cut into a tip end in a vertical plane, a convex lens protruding to the front part is formed at the cut section, and the focus of the convex lens is positioned in the fiber core of the optical fiber. The optical fiber array based optical fiber array can quickly realize the light path turning, compared with the traditional optical fiber array, the optical fiber array based optical fiber array has the coupling efficiency of 40% -50%, the optical fiber array based optical fiber array cuts the end face of the optical fiber array and forms a convex lens protruding forwards, so that the end face of the optical fiber array has a focusing function, the coupling efficiency is greatly improved, the coupling efficiency can reach 60% -70%, and the application requirements of most scenes are met. Meanwhile, the advantages of short delivery period, low premise investment and wide temperature resistance can meet the modernization requirements of fast iteration with higher and higher requirements.)

1. A corner lens optical fiber array, characterized in that the bare fiber end face of the optical fiber array is an inclined optical plane, the front part of the area outside the fiber core on the optical plane is cut off the tip in the vertical plane, and a convex lens protruding to the front part is formed at the cut-off section, and the focus of the convex lens is positioned in the fiber core of the optical fiber.

2. A corner lens fiber array according to claim 1, wherein the bare fiber end face is inclined at an angle in the range of 38-50 degrees.

3. A corner lens fiber array according to claim 2, wherein the bare fiber end face is inclined at an angle of 45 degrees.

4. A lensed fiber array according to any one of claims 1-3 wherein a tip is cut in a vertical plane using a laser cutting process in front of the region outside the core in the optical plane, and a convex lens protruding toward the front is formed at the cut section.

5. A corner lens fiber array according to claim 4, wherein the cutting line of the laser is along a direction perpendicular to the axis of the fiber array, and the minimum distance between the cutting line and the edge of the fiber core along the axis of the fiber array is 5-10 μm.

6. A manufacturing method of a corner lens optical fiber array is characterized by comprising the following steps:

fixing an optical fiber array with an inclined optical plane at the end face of a bare fiber on a laser cutting machine, wherein the optical plane is positioned on a light path of laser emitted by the laser cutting machine;

adjusting the cutting line of the laser cutting machine, so that the cutting line of the laser cutting machine is along the direction perpendicular to the axis of the optical fiber array, and the cutting line is aligned with the front part of the area outside the fiber core on the optical plane;

the laser cutting machine emits laser and cuts off the tip in a vertical plane along the cutting line, and a convex lens protruding forwards is formed at the cut section;

and processing the convex lens so that the focal point of the convex lens is positioned in the fiber core of the optical fiber.

7. The method of claim 6, wherein the cutting line is located between the edge of the optical fiber core and the tip of the bare fiber end, and the minimum distance between the cutting line and the edge of the optical fiber core along the axial direction of the optical fiber array is 5-10 μm.

8. The method for manufacturing the corner lens fiber array according to claim 6, wherein the processing of the convex lens is realized by:

and adjusting laser parameters of a laser cutting machine, irradiating and heating the convex lens to adjust the curvature radius of the convex lens, so that the focus of the convex lens is positioned in the fiber core of the optical fiber.

Technical Field

The invention relates to the technical field of optical fiber transmission, in particular to a corner lens optical fiber array and a manufacturing method thereof.

Background

There are two schemes for the commercially mainstream 90 ° corner coupling: the multi-stage condensing lens and the lens coupling scheme of the first-stage light path reflection, and the optical fiber array scheme of the 90-degree corner of the light path is directly realized by grinding the optical fiber at an angle of 45 degrees. The coupling efficiency of the lens coupling scheme can reach 80-90%, but the lens needs to be subjected to mold opening and injection molding, longer mold processing time needs to be spent, and the cost of the mold needed by the lens is not very high. The characteristics of long time and high investment in the early stage of the lens coupling scheme determine that the scheme is only suitable for mature large-scale application cases and is not suitable for the high-responsiveness requirement of fast iteration. The scheme of the optical fiber array does not need die sinking customization, the corresponding raw materials can be cut by a dicing saw, short-term rapid proofing and batch production can be realized, and the glass material corresponding to the optical fiber array can also provide part of high-end wide temperature resistance requirements. However, the coupling efficiency of the fiber array can only reach 40% -50% at the transmitting end, and the requirements of high sensitivity and high bandwidth are difficult to meet.

Disclosure of Invention

The present invention provides a corner lens fiber array to solve the above-mentioned technical problems.

The technical scheme for solving the technical problems is as follows: a corner lens optical fiber array, the bare fiber end face of the optical fiber array is an inclined optical plane, the front part of the area outside the fiber core on the optical plane is cut off the tip in the vertical plane, a convex lens protruding to the front part is formed at the cut-off section, and the focus of the convex lens is positioned in the fiber core of the optical fiber.

The invention has the beneficial effects that: the corner lens optical fiber array can quickly realize the light path corner based on the optical fiber array, has 40-50% of coupling efficiency compared with the traditional optical fiber array, cuts the end face of the optical fiber array and forms a convex lens protruding forwards, so that the end face of the optical fiber array has a focusing function, the coupling efficiency is greatly improved, the coupling efficiency can reach 60-70%, and the application requirements of most scenes are met. Meanwhile, the advantages of short delivery period, low premise investment and wide temperature resistance can meet the modernization requirements of fast iteration with higher and higher requirements.

On the basis of the technical scheme, the invention can be further improved as follows:

further: the inclination angle range of the end face of the bare fiber end is 38-50 degrees.

Further: the inclination angle of the end face of the bare fiber end is 45 degrees.

Further: and cutting the tip in a vertical plane by a laser cutting process in front of the region outside the fiber core on the optical plane, and forming a convex lens protruding to the front at the cut section.

The beneficial effects of the further scheme are as follows: the laser cutting process can utilize the instantaneous high temperature during laser cutting, so that part of the optical fiber close to the section can be instantaneously melted and is solidified again after laser pulse is cut off, and a convex lens protruding forwards is formed under the action of surface tension.

Further: the cutting line of the laser is along the direction vertical to the axis of the optical fiber array, and the minimum distance between the cutting line and the edge of the optical fiber core along the axis of the optical fiber array is 5-10 μm.

The beneficial effects of the further scheme are as follows: by controlling the minimum distance between the cutting line and the edge of the optical fiber core along the axial direction of the optical fiber array, the optical fiber core can be prevented from being melted when the front part of the area outside the optical fiber core on the optical plane is cut, and the coupling efficiency of the end face of the optical fiber can be prevented from being influenced.

The invention also provides a manufacturing method of the corner lens optical fiber array, which comprises the following steps:

fixing an optical fiber array with an inclined optical plane at the end face of a bare fiber on a laser cutting machine, wherein the optical plane is positioned on a light path of laser emitted by the laser cutting machine;

adjusting the cutting line of the laser cutting machine, so that the cutting line of the laser cutting machine is along the direction perpendicular to the axis of the optical fiber array, and the cutting line is aligned with the front part of the area outside the fiber core on the optical plane;

the laser cutting machine emits laser and cuts off the tip in a vertical plane along the cutting line, and a convex lens protruding forwards is formed at the cut section;

and processing the convex lens so that the focal point of the convex lens is positioned in the fiber core of the optical fiber.

The manufacturing method of the corner lens optical fiber array cuts the end face of the optical fiber array and forms the convex lens protruding forwards, so that the end face of the optical fiber array has a focusing function, compared with the traditional optical fiber array, the coupling efficiency is 40% -50%, the coupling efficiency is greatly improved, the coupling efficiency can reach 60% -70%, and the application requirements of most scenes are met. Meanwhile, the advantages of short delivery period, low premise investment and wide temperature resistance can meet the modernization requirements of fast iteration with higher and higher requirements.

On the basis of the technical scheme, the invention can be further improved as follows:

further: the cutting line is positioned between the edge of the optical fiber core and the tip of the bare fiber end, and the minimum distance between the cutting line and the edge of the optical fiber core along the axial direction of the optical fiber array is 5-10 mu m.

The beneficial effects of the further scheme are as follows: by controlling the minimum distance between the cutting line and the edge of the optical fiber core along the axial direction of the optical fiber array, the optical fiber core can be prevented from being melted when the front part of the area outside the optical fiber core on the optical plane is cut, and the coupling efficiency of the end face of the optical fiber can be prevented from being influenced.

Further: the specific implementation of processing the convex lens is as follows:

and adjusting laser parameters of a laser cutting machine, irradiating and heating the convex lens to adjust the curvature radius of the convex lens, so that the focus of the convex lens is positioned in the fiber core of the optical fiber.

The beneficial effects of the further scheme are as follows: by adjusting laser parameters, the temperature of the convex lens can be raised, so that the change of the surface shape of the convex lens causes the change of the curvature radius of the convex lens, and the intersection point of the convex lens is positioned in the fiber core of the optical fiber, thereby being beneficial to increasing the laser receiving angle and the receiving area and improving the laser coupling efficiency.

Drawings

FIG. 1 is a front view of a corner lens fiber array of the present invention;

FIG. 2 is a left side view of a corner lens fiber array of the present invention;

FIG. 3 is a schematic diagram of tip cutting of a corner lens fiber array according to the present invention;

FIG. 4 is a schematic structural diagram of a cleaved corner lens fiber array according to the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a schematic view of the light receiving area and acceptance angle of an uncut corner lens fiber array;

FIG. 7 is a schematic diagram of the light receiving area and the receiving angle of the cleaved corner lens fiber array of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. optical fiber microstrip 2, grooved substrate 3, cover plate 4, laser.

11. A bare fiber end 12, a microstrip end;

111. core, 112, convex lens.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, a corner lens optical fiber array of the present invention comprises an optical fiber micro strip 1, a grooved substrate 2 and a cover plate 3, wherein the optical fiber micro strip 1 comprises a bare fiber end 11 with an optical fiber pattern removed and a micro strip end 12 with an optical fiber pattern applied, a plurality of V-shaped grooves arranged in parallel array are formed on the grooved substrate 2 for placing the bare fiber end 11, the bare fiber end 11 extends out from the front end of the V-shaped groove, the cover plate 3 presses the bare fiber end in the V-shaped groove, the grooved substrate 2, the cover plate 3 and the bare fiber end are connected and fixed by an adhesive, the end face of the bare fiber end 11 of the optical fiber array is an inclined optical plane, the front part of the optical plane outside the fiber core 111 is cut off at a vertical plane, and a convex lens 112 protruding to the front part is formed at the cut off section, and the focal point of the convex lens 112 is located in the core of the optical fiber.

The corner lens optical fiber array can quickly realize the light path corner based on the optical fiber array, has 40-50% of coupling efficiency compared with the traditional optical fiber array, cuts the end face of the optical fiber array and forms a convex lens protruding forwards, so that the end face of the optical fiber array has a focusing function, the coupling efficiency is greatly improved, the coupling efficiency can reach 60-70%, and the application requirements of most scenes are met. Meanwhile, the advantages of short delivery period, low premise investment and wide temperature resistance can meet the modernization requirements of fast iteration with higher and higher requirements.

In one or more embodiments provided by the present invention, the inclination angle of the end surface of the bare fiber end 11 ranges from 38 degrees to 50 degrees.

In one or more embodiments provided by the present invention, the inclination angle of the end face of the bare fiber end 11 is 45 degrees.

In one or more embodiments provided by the present invention, a tip is cut in a vertical plane using a laser cutting process at a front portion of an area outside the core 111 on the optical plane, and a convex lens 112 protruding toward the front is formed at the cut section. The laser cutting process can utilize the instantaneous high temperature during laser cutting, so that the part of the optical fiber close to the cross section can be instantaneously melted and is solidified again after the laser pulse is cut off, and a convex lens 112 protruding forwards is formed under the action of surface tension.

In one or more embodiments provided herein, the cutting line of the laser is along a direction perpendicular to the axis of the optical fiber array, and the minimum distance between the cutting line and the edge of the optical fiber core 111 along the axis of the optical fiber array is 5-10 μm. By controlling the minimum distance between the cutting line and the edge of the optical fiber core 111 along the axial direction of the optical fiber array, the optical fiber core can be prevented from being melted when the front part of the region outside the optical fiber core on the optical plane is cut, and the coupling efficiency of the end face of the optical fiber can be prevented from being influenced.

The invention also provides a manufacturing method of the corner lens optical fiber array, which comprises the following steps:

step 1: fixing an optical fiber array with the end face of the bare fiber end 11 as an inclined optical plane on a laser cutting machine, wherein the optical plane is positioned on a light path of laser emitted by the laser cutting machine;

step 2: adjusting the cutting line of the laser cutter so that the cutting line of the laser cutter is along the direction perpendicular to the axis of the optical fiber array and the cutting line is aligned with the front part of the area outside the fiber core 111 on the optical plane, as shown in fig. 3;

and step 3: the laser cutter emits laser light and cuts the tip in a vertical plane along the cutting line and forms a convex lens 112 protruding forward at the cut section, as shown in fig. 4 and 5;

and 4, step 4: the convex lens 112 is machined so that the focal point of the convex lens is located within the core 111 of the optical fiber.

According to the manufacturing method of the corner lens optical fiber array, the end face of the optical fiber array is cut and processed to form the convex lens 112 protruding forwards, so that the end face of the optical fiber array has a focusing function, compared with the traditional optical fiber array, the coupling efficiency is 40% -50%, the coupling efficiency is greatly improved, the coupling efficiency can reach 60% -70%, and the application requirements of most scenes are met. Meanwhile, the advantages of short delivery period, low premise investment and wide temperature resistance can meet the modernization requirements of fast iteration with higher and higher requirements.

The light receiving area and the receiving angle of the normal corner fiber array are shown in fig. 6, since only the fiber core 111 can effectively receive light, after the laser 4 emits laser light, the light receiving angle is alpha, the rest light can not enter the fiber core 111, the light receiving area and the receiving angle of the corner lens fiber array processed by the invention are shown in figure 7, since the convex lens 112 has a focusing function, the effective light receiving part is divided into the core 111 and the convex lens 112, and after the laser 4 emits laser light, the light receiving angle is beta, therefore, the light irradiated on the convex lens 112 of the corner lens fiber array processed by the invention enters the fiber core due to the focusing effect of the light, and is transmitted in the fiber core, the light receiving area and the light receiving angle are greatly increased, so that the coupling efficiency of the optical fiber array is greatly improved.

In one or more embodiments provided by the present invention, the cutting line is located between the edge of the optical fiber core 111 and the tip of the bare fiber end 11, and the minimum distance between the cutting line and the edge of the optical fiber core 111 along the axial direction of the optical fiber array is 5-10 μm. By controlling the minimum distance between the cutting line and the edge of the optical fiber core 111 along the axial direction of the optical fiber array, the optical fiber core can be prevented from being melted when the front part of the region outside the optical fiber core 111 on the optical plane is cut, and the coupling efficiency of the end face of the optical fiber can be prevented from being influenced.

It should be noted that, here, the minimum distance between the cutting line and the edge of the optical fiber core 111 along the axial direction of the optical fiber array is related to the specification of the optical fiber, and in practice, the minimum distance needs to be adjusted according to optical fibers of different specifications to achieve a better focusing effect, so that the coupling efficiency is higher.

In one or more embodiments provided in the present invention, the processing of the convex lens is implemented as:

and adjusting laser parameters of a laser cutting machine, and irradiating and heating the convex lens 112 to adjust the curvature radius of the convex lens 112 so that the focal point of the convex lens 112 is located in the fiber core of the optical fiber.

By adjusting laser parameters, the temperature of the convex lens can be raised, so that the surface shape of the convex lens 112 is changed, the curvature radius of the convex lens 112 is changed, and the intersection point of the convex lens is located in the fiber core of the optical fiber, thereby being beneficial to increasing the laser receiving angle and the receiving area and improving the laser coupling efficiency. Here, the laser parameters include laser pulse time and pulse energy.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.