阅读说明：本技术 扩束光纤及其制作方法 (Beam expanding optical fiber and manufacturing method thereof ) 是由 卢建南 邓剑钦 叶德华 于 2021-09-01 设计创作，主要内容包括：本发明提供一种扩束光纤及其制作方法,包括安装管、至少两根光纤和扩束镜,安装管在光路方向的第一端部设置有第一连接端面,第一连接端面垂直于光路方向,光纤的包层位于安装管的安装孔中,光纤的包层的出射端面位于第一连接端面处,出射端面平行于第一连接端面,扩束镜在朝向第一连接端面的一侧设置有第二连接端面,第二连接端面平行于第一连接端面,第二连接端面盖合安装孔并与第一连接端面胶接,出射端面分别与第二连接端面连接。通过多个出射端面则与第二连接端面连接,光线从出射端面出射后从扩束镜进行扩束输出,从而实现多光纤同时扩束,解决了对位精度要求高、输出光线异面角、保偏光纤猫眼对位精度低的问题。(The invention provides a beam expanding optical fiber and a manufacturing method thereof, and the beam expanding optical fiber comprises an installation tube, at least two optical fibers and a beam expanding lens, wherein a first connecting end face is arranged at a first end part of the installation tube in the optical path direction, the first connecting end face is vertical to the optical path direction, the cladding of the optical fibers is positioned in an installation hole of the installation tube, the emergent end face of the cladding of the optical fibers is positioned at the first connecting end face and is parallel to the first connecting end face, the beam expanding lens is provided with a second connecting end face at one side facing to the first connecting end face, the second connecting end face is parallel to the first connecting end face, the second connecting end face covers the installation hole and is connected with the first connecting end face, and the emergent end faces are respectively connected with the second connecting end face. Through a plurality of exit terminal surfaces then with the second be connected the terminal surface and be connected, light is followed the beam expanding lens and is expanded beam output after the exit of exit terminal surface to realize many optic fibre and expand the beam simultaneously, solved that the counterpoint precision requires high, the different face angle of output light, polarization maintaining fiber cat eye counterpoint low problem of precision.)

1. An expanded beam optical fiber, comprising:

the mounting tube is provided with a mounting hole in a penetrating manner along the light path direction, a first connecting end face is arranged at the first end part of the mounting tube in the light path direction, and the first connecting end face is perpendicular to the light path direction;

at least two optical fibers, wherein the cladding of the optical fibers is positioned in the mounting hole, the emergent end surface of the cladding of the optical fibers is positioned at the first connecting end surface, and the emergent end surface is parallel to the first connecting end surface;

the beam expanding lens, the beam expanding lens is in the orientation one side of first connection terminal surface is provided with the second and connects the terminal surface, the second is connected the terminal surface and is on a parallel with first connection terminal surface, the second is connected the terminal surface lid and is closed the mounting hole and with first connection terminal surface splices, the emergent terminal surface respectively with the second is connected the terminal surface and is connected.

2. The expanded beam optical fiber of claim 1, wherein:

the area of the first connecting end surface is larger than that of the second connecting end surface.

3. The expanded beam optical fiber of claim 1, wherein:

the optical fiber is a polarization maintaining optical fiber, a single mode optical fiber or a multimode optical fiber.

4. The expanded beam optical fiber of claim 1, wherein:

the beam expander is made of fused silica material.

5. The expanded beam optical fiber of claim 1, wherein:

the beam expander is a wedge prism or a convex lens.

6. The expanded beam optical fiber of claim 1, wherein:

the cross section of the mounting hole is circular or rectangular, and the cladding layers of at least two optical fibers are closely arranged in the mounting hole.

7. The expanded beam optical fiber of claim 1, wherein:

the optical fiber is glued with the second end part of the installation tube in the direction of the optical path.

8. The expanded beam optical fiber of any one of claims 1 to 7, wherein:

and a pressing acting force is preset between the emergent end face and the second connecting end face, and the emergent end face is in pressing connection with the second connecting end face.

9. The expanded beam optical fiber of claim 8, wherein:

and the clearance between the emergent end face and the second connecting end face is less than or equal to 100 nanometers.

10. A method of manufacturing an expanded beam optical fiber, wherein the expanded beam optical fiber is the expanded beam optical fiber according to claim 7 or 8;

the manufacturing method comprises the following steps:

placing a cladding of the optical fiber in the mounting hole;

fixedly connecting the optical fiber with the installation tube;

end face grinding is carried out on the first connecting end face and the emergent end face, so that the emergent end face protrudes outwards from the first connecting end face;

the second connecting end face covers the mounting hole and is in adhesive joint with the first connecting end face, and the emergent end face is in press fit connection with the second connecting end face.

Technical Field

The invention relates to the field of optical devices, in particular to a beam expanding optical fiber and a manufacturing method thereof.

Background

Multi-fiber in prior art expands and uses, what generally adopt is in one section multimode fiber of every fiber fusion or centreless fiber, then adorn the optic fibre after the butt fusion in the capillary, in order to satisfy the performance requirement, the splice point that needs each optic fibre strictly aligns, and optic fibre is the polarization maintaining fiber, still need carry out accurate counterpoint to the cat eye, in addition when the fiber expands the beam fusion, because there is the butt fusion angle, lead to the light of each optic fibre output after expanding the beam, there is the antarafacial contained angle, influence coupling loss, lead to the yield low, and after the light beam expands, can influence the observation effect of terminal surface.

Disclosure of Invention

A first object of the present invention is to provide a beam expanding optical fiber which is easy to align, convenient to manufacture, and stable in structure.

The second purpose of the invention is to provide a method for manufacturing the beam expanding optical fiber.

In order to achieve the first object of the present invention, the present invention provides a beam expanding optical fiber, including a mounting tube, at least two optical fibers and a beam expanding mirror, wherein the mounting tube is provided with a mounting hole penetrating along an optical path direction, a first connecting end surface is provided at a first end of the mounting tube in the optical path direction, the first connecting end surface is perpendicular to the optical path direction, a cladding of the optical fiber is located in the mounting hole, an emergent end surface of the cladding of the optical fiber is located at the first connecting end surface, the emergent end surface is parallel to the first connecting end surface, the beam expanding mirror is provided with a second connecting end surface at a side facing the first connecting end surface, the second connecting end surface is parallel to the first connecting end surface, the second connecting end surface covers the mounting hole and is bonded to the first connecting end surface, and the emergent end surfaces are respectively connected to the second connecting end surface.

It is visible by above-mentioned scheme, through the parallel arrangement of first connection terminal surface, second connection terminal surface and exit terminal surface, and the setting of perpendicular to light path direction respectively, then the second connection terminal surface lid closes the mounting hole and when splicing with first connection terminal surface, the exit terminal surface then is connected with the second connection terminal surface, light expands beam output from expanding beam lens after the exit terminal surface is emergent, thereby realize that many optical fibers expand the beam simultaneously, solved that the counterpoint precision requires highly, output light ray antarafacial angle, cat eye counterpoint low precision problem.

In a further aspect, the area of the first connecting end surface is larger than the area of the second connecting end surface.

In a further aspect, the adhesive between the first connection end face and the second connection end face is located at an outer edge of the second connection end face.

It is from top to bottom visible, be less arranging through the beam expanding lens, do benefit to the miniaturization of beam expanding fiber device and arrange, and less second connection terminal surface easily assembles to and utilize to adopt bonding glue to bond all around not only play the stable assembly effect, and also can play sealed in order to improve stability.

Still further, the beam expander is made of fused silica material.

In a further scheme, the beam expander is a wedge prism or a convex lens.

It is from top to bottom seen, through carrying out the terminal surface grinding to fused quartz material's beam expander, can make beam expander can with emergent terminal surface zonulae occludens, effectively reduce the loss, and utilize wedge prism or convex lens can realize the beam expanding of different light beam shapes and different light paths.

In a further aspect, the cross-section of the mounting hole is circular or rectangular, and the cladding of at least two optical fibers is closely arranged in the mounting hole.

It is thus clear that the mounting hole through different shapes can hold many optic fibres, then can be connected and realize corresponding expanding beam simultaneously with the beam expanding lens to many optic fibres simultaneously.

In a further embodiment, the optical fiber is glued to the second end of the mounting tube in the direction of the optical path.

The further proposal is that a pressing acting force is preset between the emergent end face and the second connecting end face, and the emergent end face is in pressing connection with the second connecting end face.

In a further aspect, the gap between the exit end face and the second connection end face is less than or equal to 100 nm.

From top to bottom, through the fixed of optic fibre to and to emergent terminal surface and second connection terminal surface pressfitting connection, can make the clearance between emergent terminal surface and the second connection terminal surface less than or equal to 100 nanometers, the emergent terminal surface utilizes intermolecular force to connect with the second connection terminal surface promptly to effectively reduce the loss, and connect the assembly simply.

In order to achieve the second object of the present invention, the present invention provides a method for manufacturing a beam expanding fiber, wherein the beam expanding fiber is the beam expanding fiber according to the above scheme;

the manufacturing method comprises the following steps:

placing the cladding of the optical fiber in the mounting hole;

fixedly connecting the optical fiber with the installation tube;

end face grinding is carried out on the first connecting end face and the emergent end face, so that the emergent end face protrudes outwards from the first connecting end face;

the second connecting end face covers the mounting hole and is in adhesive joint with the first connecting end face, and the emergent end face is in press fit connection with the second connecting end face.

According to the scheme, after the first connecting end face and the emergent end face are subjected to end face grinding on the same plane, the emergent end face is higher than the first connecting end face, when the second connecting end face is covered, the emergent end of the optical fiber is deformed inwards, and then the pressing action force is preset, so that the emergent end face is tightly connected with the second connecting end face.

Drawings

FIG. 1 is a cross-sectional view of a first embodiment of an expanded beam optical fiber of the present invention after end-face polishing.

Fig. 2 is an enlarged view of a in fig. 1.

FIG. 3 is a cross-sectional view of a first embodiment of expanded beam optical fiber of the present invention after end face compression.

FIG. 4 is a diagram of a first embodiment of expanded beam fiber according to the present invention after being cemented.

FIG. 5 is a side view of a first embodiment of an expanded beam fiber of the present invention taken along the optical path.

Fig. 6 is an enlarged view at B in fig. 5.

FIG. 7 is a schematic view of the optical fiber configuration in a second embodiment of the expanded beam optical fiber of the present invention.

FIG. 8 is a schematic view of the optical fiber configuration in a third embodiment of the expanded beam optical fiber of the present invention.

FIG. 9 is a schematic view of the optical fiber configuration in a fourth embodiment of the expanded beam optical fiber of the present invention.

Fig. 10 is a block diagram of a fifth embodiment of an expanded beam optical fiber according to the present invention.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

Beam expanding fiber first embodiment:

referring to fig. 1, the beam expanding optical fiber includes an installation tube 1, two optical fibers and a beam expander 3, the optical fibers are polarization maintaining optical fibers 2, the installation tube 1 can adopt a microtube or a capillary tube, and the installation tube 1 can be made of quartz material, the installation tube 1 is provided with a mounting hole 11 along a light path direction X in a penetrating manner, the installation tube 1 is provided with a first connection end face 12 at a first end of the light path direction X, the first connection end face 12 is perpendicular to the light path direction X, the installation tube 1 is provided with a fixing groove at a second end 13 of the light path direction X, and the fixing groove is arranged in a conical manner.

Beam expander 3 is made by fused silica material, and beam expander 3 is the setting of wedge prism, and beam expander 3 is provided with second connection terminal surface 32 in the one side towards first connection terminal surface 12 promptly, and second connection terminal surface 32 is on a parallel with first connection terminal surface 12, and beam expander 3 is provided with emergent face 31 in the relative one side of second connection terminal surface 32, is acute angle contained angle between emergent face 31 and the second connection terminal surface 32 and arranges.

Referring to fig. 6 in combination with fig. 1, the polarization maintaining fiber 2 includes a coating layer, a cladding 21 and a fiber core, the polarization maintaining fiber 2 is a panda-type polarization maintaining fiber, the coating layer is wrapped outside the cladding 21, the fiber core is disposed in the cladding 21, and stress rods are disposed on two sides of the fiber core.

When the beam expanding optical fiber is manufactured and the manufacturing method is executed, step 1 is executed firstly, a part of coating layer on the polarization maintaining optical fiber 2 is removed, the cladding is exposed, then the cladding 21 of the polarization maintaining optical fiber 2 is placed in the mounting hole 11, the emergent end of the polarization maintaining optical fiber 2 is located at the first connecting end face 12, the position of the cat eye is adjusted and aligned, the cladding 21 of the polarization maintaining optical fiber 2 is tightly distributed in the mounting hole 11, the outer wall of the cladding 21 is abutted with the inner wall of the mounting hole 11, and then the cladding 21 is radially positioned, so that the position of the cat eye is easily adjusted and fixed.

Then step 2 is executed to fixedly connect the polarization maintaining fiber 2 and the installation tube 1, that is, the fixing groove at the second end 13 of the installation tube 1 is filled with adhesive glue, and the adhesive glue fixedly connects the coating layer of the polarization maintaining fiber 2 and the installation tube 1.

Then, step 3 is performed, and then the first connection end face 12 and the exit end face 22 are end-face ground by an optical fiber end-face grinding machine, a grinding disc with a ring groove or a circular groove is used, and the grinding material and the grinding time are controlled, so that the exit end face 22 protrudes outward from the first connection end face 12, and the exit end face is higher than the first connection end face, as shown in fig. 2.

Referring to fig. 3 to 5, step 4 is then executed, the area of the first connection end surface 12 is larger than the area of the second connection end surface 32, the second connection end surface 32 covers the mounting hole 11 and is bonded to the first connection end surface 12 through bonding glue, and the bonding glue between the first connection end surface 12 and the second connection end surface 32 is located at the outer edge of the second connection end surface 32. And, the second connection terminal surface 32 contacts with the exit terminal surface 22, along with the deformation of the exit end of the polarization maintaining fiber 2, then the lamination acting force is preset between the exit terminal surface 22 and the second connection terminal surface 32, the exit terminal surface 22 is in lamination connection with the second connection terminal surface 32, the gap between the exit terminal surface 22 and the second connection terminal surface 32 is less than or equal to 100 nanometers, then the exit terminal surface is connected with the second connection terminal surface by utilizing intermolecular force, thereby effectively reducing the loss of optical transmission, and after the light beam exits from the exit terminal surface 22, the light beam is expanded and output in the beam expander lens 3.

Beam expanding fiber second embodiment:

referring to fig. 7, four polarization maintaining fibers 42 may be further disposed in the circular mounting hole 41 of the mounting tube, or the size of the mounting hole 41 may be adjusted, three polarization maintaining fibers or more polarization maintaining fibers may be mounted, and the polarization maintaining fibers are closely arranged in the mounting hole 41.

Beam expanding fiber third embodiment:

referring to fig. 8, the mounting hole 43 of the mounting tube has a rectangular or oblong cross-section, and a plurality of polarization maintaining fibers 44 are arranged in a 5X2 manner in the mounting hole 43.

Beam expanding fiber fourth embodiment:

referring to fig. 9, the mounting holes 45 of the mounting tube are arranged in a rectangular or rectangular shape in cross section, and a plurality of polarization maintaining fibers 45 are arranged and set in the mounting holes 46 in a 3X3 manner.

Beam expanding fiber fifth embodiment:

referring to fig. 10, the beam expander 47 may also be a convex lens, that is, one end of the beam expander 47 is a straight second connecting end surface, and the other end is a convex arc surface.

Of course, the above embodiments are only preferred embodiments of the present disclosure, and in practical applications, the beam expander may be a combined prism assembly, which can adjust the light path and the light beam. Or the area of the first connection end face 12 is smaller than or equal to the area of the second connection end face 32, and the optical fiber can also be a single-mode optical fiber or a multi-mode optical fiber, and these changes can achieve the purpose of the present invention.

It is from top to bottom visible, through first connection terminal surface, the parallel arrangement of second connection terminal surface and exit terminal surface, and the setting of perpendicular to light path direction respectively, then the second is connected the terminal surface lid and is closed the mounting hole and when splicing with first connection terminal surface, the exit terminal surface then is connected the terminal surface with the second, light expands beam from the beam expanding lens and expands beam output after the exit terminal surface is emergent, thereby realize that many optical fibers expand the beam simultaneously, it requires high to have solved the counterpoint precision, output light ray different face angle, cat eye counterpoint low problem of precision.