CN112363254A - Novel lens array and production method - Google Patents
Novel lens array and production method Download PDFInfo
- Publication number
- CN112363254A CN112363254A CN202011450239.0A CN202011450239A CN112363254A CN 112363254 A CN112363254 A CN 112363254A CN 202011450239 A CN202011450239 A CN 202011450239A CN 112363254 A CN112363254 A CN 112363254A
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- lens array
- optical fiber
- multimode optical
- novel lens
- multimode
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
- G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
- G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
- G02B6/364—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves inverted grooves, e.g. dovetails
Abstract
The invention provides a novel lens array, which comprises an installation body and a plurality of optical fibers; the mounting body is provided with a plurality of mounting grooves for mounting optical fibers; the optical fibers are arranged in the mounting groove and are multimode optical fibers with the fiber core refractive indexes distributed according to gradient; parallel light enters the multimode optical fiber, is bent and then is emitted from the other end of the multimode optical fiber, and the emitted light is converged on a focal plane to form an independent convergent light spot on the focal plane. According to the novel lens array provided by the invention, proper multimode fibers can be selected to be installed in the installation groove according to the needs of users, the novel projection array can replace the traditional lens array formed by the protrusions by adopting the multimode fibers to be installed in the early installation groove, the working principle and the structure are different, the production process is simpler, the production materials are more easily obtained, the proper multimode fibers can be matched according to the needs of the users, and the production is more flexible.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a novel lens array and a production method thereof.
Background
A conventional lens array, generally of rectangular configuration, has 4 protrusions with curvature on one of its faces, see figure 1. The curvature of the convex is designed according to the application scene, and is usually designed to be spherical curvature or aspherical curvature. The purpose of the protrusions is to converge a large collimated or divergent incident beam into a focal plane, forming 4 independent converging spots on the focal plane to match the system requirements.
In the lens array in the prior art, the protrusions are used as single lenses, and the protrusions of the lens array are regularly arranged at equal intervals, which is equivalent to the lens array consisting of a plurality of single lenses. The above-mentioned lens array production method generally adopts two modes: firstly, the melted material is poured in a mould and opened after molding, and the requirement of the lens array is in the micron level, so that the production method has higher requirement on the precision of the mould; secondly, the rectangular mounting body is bombarded, bombarded and engraved to form the bulge, and the production precision of the production method is not high. In addition, the manufacturing process of the above-mentioned production method is complicated, and the size requirements of the protrusions for different lens arrays are different, so that the size of the mold or the size of the bump in the molding process needs to be changed when each different lens array is manufactured, thereby increasing the complexity of the manufacturing process.
Therefore, a new lens array and a new method for manufacturing the same are needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a novel lens array and a production method thereof.
The technical scheme of the invention is summarized as follows:
the invention provides a novel lens array, which comprises an installation body and a plurality of optical fibers;
the mounting body is provided with a plurality of mounting grooves for mounting optical fibers;
the optical fibers are arranged in the mounting groove and are multimode optical fibers with the fiber core refractive indexes distributed according to gradient;
parallel light enters the multimode optical fiber, is bent and then is emitted from the other end of the multimode optical fiber, and the emitted light is converged on a focal plane to form an independent convergent light spot on the focal plane.
Further, the multimode optical fiber comprises a cladding and a core, and the refractive index of the core is reduced along with the increase of the radius of the core.
Further, a relation model exists between the relative refractive index of the multimode optical fiber and the radius of the fiber core, and the radius of the fiber core is selected according to user requirements based on the relation model.
Furthermore, a V-shaped groove is formed in the mounting body, and the multimode optical fiber is mounted in the V-shaped groove.
Furthermore, the installation body comprises a bottom plate and a cover plate, a V-shaped groove is formed in the bottom plate, the multimode optical fiber is installed in the V-shaped groove, and the cover plate is tightly attached to the surface of the V-shaped groove to protect the multimode optical fiber.
Further, the V-shaped grooves are arranged equidistantly.
Further, the length of the optical fiber is changed to make the focal plane located on the end face of the novel lens array or at a certain distance from the end face.
Further, when the focal plane is away from the end face by a certain distance, the light rays are still parallel light after being emitted from the novel lens array.
A method of producing a novel lens array as claimed in any preceding claim, comprising:
forming an installation body and forming the installation groove on the installation body;
molding the multimode optical fiber according to the requirements of users;
and fixing the multimode optical fiber in the mounting groove.
Further, the molding of the multimode optical fiber further comprises polishing or cutting or plating an anti-reflection film on the surface of the multimode optical fiber.
Compared with the prior art, the invention has the beneficial effects that: according to the novel lens array provided by the invention, proper multimode fibers can be selected to be installed in the installation groove according to the needs of users, the novel projection array can replace the traditional lens array formed by the protrusions by adopting the multimode fibers to be installed in the early installation groove, the working principle and the structure are different, the production process is simpler, the production materials are more easily obtained, the proper multimode fibers can be matched according to the needs of the users, and the production is more flexible.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a conventional lens array in the prior art;
FIG. 2 is a schematic diagram of light rays of a conventional lens array in the prior art;
FIG. 3 is a schematic view of a lens array in the present invention;
FIG. 4 is a disassembled front view of the lens array of the present invention;
FIG. 5 is a graph of the refractive index versus the individual fibers in a lens array in an embodiment of the present invention;
FIG. 6 is a schematic diagram of the light rays from a single optical fiber in a lens array according to the present invention;
fig. 7 is a light ray diagram of the lens array of the present invention.
Reference numerals: 100. a conventional lens array; 101. a first protrusion; 102. a second protrusion; 103. a third protrusion; 104. a fourth protrusion; 200. a novel lens array; 201. a first optical fiber; 202. a second optical fiber; 203. a third optical fiber; 204. a fourth optical fiber; 206. a cladding layer; 207. a fiber core; 208. incident light; 209. emitting light; 210. a cover plate; 220. a base plate; 230. a focal plane; 240. refractive index profile.
Detailed Description
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, which will enable those skilled in the art to practice the present invention with reference to the accompanying specification. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict. It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Referring to fig. 1-2, a conventional lens array 100 in the prior art is generally formed by disposing a plurality of protrusions with curvature on a rectangular parallelepiped structure, and referring to fig. 1, a conventional four-channel lens array is provided with a first protrusion 101, a second protrusion 102, a third protrusion 103, and a fourth protrusion 104, where the curvature of each protrusion is custom designed according to a scene, and is generally designed as a spherical curvature or an aspherical curvature. The purpose is to converge the larger collimated or divergent incident beam into a focal plane, and form four independent convergent light spots on the focal plane so as to match the system requirements. For example, the diameter of the beam waist of the light spot emitted from the single-mode laser is generally about 4um when the light spot is matched, or the size of the active area of the PD is matched, and the diameter of the active area of the PD of the high-speed optical module is generally smaller than 20 um. The lens array is different from a single lens in that all the bulges of the lens array are regularly and equally spaced and are equivalent to a plurality of single lenses. For example, in an arrangement with a center distance of 750um, with center distance accuracy on the order of um. Referring to the schematic diagram of the optical path of the conventional lens array 100 in fig. 2, the conventional lens array 100 adopts the principle that the projection is used as a single lens, and four paths of collimated light with a large light spot size form four smaller light spots on a focal plane under the convergence action of the conventional lens array 100 by using the refraction action of the lens.
The above-mentioned conventional lens array 100 inevitably requires strict requirements on the precision of the protrusion in the processing process, and the processing process of the production method is complicated no matter whether the protrusion is formed by a mold or by engraving, and the mold size or the engraving size in the molding process needs to be changed when each different lens array is produced, which increases the complexity of the production process.
In order to solve the above problems, the present invention provides a novel lens array and a processing method thereof.
Example 1:
referring to fig. 3 to 7, a novel lens array includes a mounting body and a plurality of optical fibers; the mounting body is provided with a plurality of mounting grooves for mounting optical fibers; the optical fibers are arranged in the mounting groove and are multimode optical fibers with the fiber core refractive indexes distributed according to gradient; parallel light enters the multimode fiber, is bent and then exits from the other end of the multimode fiber, and the exiting light is converged on the focal plane 230 to form an independent convergent light spot on the focal plane 230.
The installation body is provided with a V-shaped groove, and the multimode optical fiber is installed in the V-shaped groove.
Specifically, the novel lens array 200 includes a mounting body and a multimode fiber, the mounting body includes a bottom plate 220 and a cover plate 210, a V-shaped groove is formed on the bottom plate 220, the multimode fiber is mounted in the V-shaped groove, and the cover plate 210 is tightly attached to the surface of the V-shaped groove to protect the multimode fiber. The V-shaped grooves are arranged at equal intervals.
Referring to fig. 3-4, in the embodiment of the novel lens array with four channels, the bottom plate 220 is provided with four V-shaped grooves, a first optical fiber 201, a second optical fiber 202, a third optical fiber 203, and a fourth optical fiber 204 are respectively disposed in each V-shaped groove, the four optical fibers are multimode optical fibers, and the refractive indexes of the cores of the multimode optical fibers are distributed according to gradients. The first optical fiber 201, the second optical fiber 202, the third optical fiber 203, the fourth optical fiber 204 and the bottom plate 220 are adhered together by glue to form a four-channel novel lens array 200. The V-grooves function to uniformly arrange the optical fibers at a certain interval, and the cover plate 210 functions to protect the multimode optical fibers and to make the multimode optical fibers closely adhere to the surfaces of the V-grooves to ensure the interval arrangement. The multimode optical fiber has the function of converging incident light. The surface of the optical fiber is usually polished or cut to improve the surface smoothness, and an anti-reflection film can be coated on the surface, so that less energy loss occurs when light passes through the surface.
Specifically, referring to fig. 5, the multimode optical fiber includes a cladding 206 and a core 207, and the refractive index of the core 207 decreases as the radius of the core 207 increases.
A relation model exists between the relative refractive index of the multimode optical fiber and the radius of the fiber core 207, and the radius of the fiber core 207 is selected according to the user requirement based on the relation model. Specifically, the refractive index of the multimode fiber with a gradient profile has a core with a relative refractive index variation along a radial direction r of the core 207 defined by the following formula:
wherein r is0α is the profile parameter, and Δ 0 is the difference between the core index at r-0 and the core index at r-r 0. r is a variable, r can be understood as the radial coordinate in the range of 0 to the outer diameter of the cladding, and r0 is the maximum diameter. In the art, for an abrupt refractive index profile, α is greater than or equal to 10. For a gradient index profile, α is less than 10.
When α is 2, the refractive index profile of the core is a parabolic profile, and the cladding maintains a single refractive index. Fig. 5 shows the structure and refractive index profile along the radius direction, the upper part of fig. 5 is a schematic diagram of the optical fiber, and the lower part is a refractive index profile 240, and referring to fig. 5, it can be seen that when r is 0, the refractive index is the largest here, and the refractive index decreases as r increases, and reaches the interface between the cladding and the core.
Meanwhile, the refractive index distribution of G-lens (self-focusing lens) known in the art is also gradient, and the formula of the refractive index along the radial direction r of the lens is:
wherein N is0The refractive index of the center point when r is 0, and a is the focusing constant of G-lens. As can be seen from the formula, the refractive index profile is also parabolic in shape.
In combination, the core of the graded index fiber can be made to act like a G-lens if the appropriate fiber parameters (r, α, Δ 0) are matched. For example, r may be selected to be equal to 0.15mm, α equal to 2, N0Equal to 1.55, Δ0Equal to 1.5%, the corresponding matched G-lens parameter is: n0 equals 1.55 and A equals 1.346. Both have refractive indices of r<Within 0.15mm, almost the same.
The change in length of the optical fiber causes the focal plane to be located on or at a distance from the end face of the novel lens array. Referring to fig. 6, which is a schematic diagram of the optical path of a single optical fiber, and fig. 7 is a schematic diagram of the optical path of the entire novel lens array 200, it can be seen in fig. 6 that parallel light enters at a certain length of the optical fiber, and a convergence point is formed on the end surface, and the position of the convergence point is the focal plane. Referring to fig. 7, when the length of the optical fiber is increased, parallel light is incident to form a focal plane at a position spaced apart from the end surface. That is, when the focal plane is away from the end face by a certain distance, the light rays are still parallel light after being emitted from the novel lens array.
By choosing the appropriate length of the G-lens, different optical properties can be achieved. By analogy, similar functions can be achieved by selecting different fiber lengths. For example, if a length of 0.25pitch is chosen, the light will converge on the end face if the light is incident parallel (see fig. 6). If the length of 0.50pitch is selected, the light will still be parallel light after exiting if the light is parallel incident (refer to fig. 7). Referring to fig. 7, the present embodiment is a lens matrix assembled by four gradient index fibers through a V-groove. According to the principle, each path of parallel light is used as an incident optical fiber 208, enters the core of the optical fiber, is bent, and exits from the other section, and an emergent light ray 209 is converged on a focal plane. The length of the fiber is designed such that the focal plane is located outside the lens surface. Therefore, the single optical fiber can realize the function of a self-focusing lens, and after a plurality of optical fibers are fixed in the V-shaped groove in parallel, the traditional convex lens array can be replaced.
Accordingly, the present invention also provides a method of producing a novel lens array as defined in any one of the above, comprising:
s1, forming the mounting body and forming a mounting groove on the mounting body;
s2, molding the multimode optical fiber according to the requirement of the user;
and S3, fixing the multimode optical fiber in the mounting groove.
Wherein the molding the multimode optical fiber in S2 further comprises polishing or cutting or plating an anti-reflection film on the surface of the multimode optical fiber. The surface of the optical fiber is usually polished or cut to improve the surface smoothness, and an anti-reflection film can be coated on the surface, so that less energy loss occurs when light passes through the surface.
The novel lens array provided by the invention is proved to be capable of realizing the function of the traditional lens array through a plurality of tests, and the novel lens array provided by the invention can select proper multimode fibers to be installed in the installation groove according to the needs of users.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (10)
1. A novel lens array is characterized by comprising an installation body and a plurality of optical fibers;
the mounting body is provided with a plurality of mounting grooves for mounting optical fibers;
the optical fibers are arranged in the mounting groove and are multimode optical fibers with the fiber core refractive indexes distributed according to gradient;
parallel light enters the multimode optical fiber, is bent and then is emitted from the other end of the multimode optical fiber, and the emitted light is converged on a focal plane to form an independent convergent light spot on the focal plane.
2. The novel lens array of claim 1, wherein the multimode optical fiber comprises a cladding and a core, the core having a refractive index that decreases with increasing core radius.
3. The novel lens array of claim 2, wherein there is a relational model of the relative refractive index of the multimode optical fiber and the radius of the core, and the radius of the core is selected according to user requirements based on the relational model.
4. The novel lens array of claim 1, wherein the mounting body has V-grooves, and the multimode optical fibers are mounted in the V-grooves.
5. The novel lens array as claimed in claim 1, wherein the mounting body includes a bottom plate and a cover plate, the bottom plate is provided with a V-shaped groove, the multimode optical fiber is mounted in the V-shaped groove, and the cover plate is tightly attached to the surface of the V-shaped groove to protect the multimode optical fiber.
6. A novel lens array as claimed in claim 4 or 5, wherein the V-shaped grooves are equidistantly arranged.
7. The novel lens array of claim 1, wherein the length of the optical fiber is changed such that a focal plane is located on or at a distance from an end face of the novel lens array.
8. The novel lens array of claim 6, wherein when the focal plane is at a distance from the end face, the light rays are still parallel after exiting the novel lens array.
9. A method of producing a novel lens array according to any one of claims 1 to 8, comprising:
forming an installation body and forming the installation groove on the installation body;
molding the multimode optical fiber according to the requirements of users;
and fixing the multimode optical fiber in the mounting groove.
10. The method of manufacturing of claim 1, wherein shaping the multimode optical fiber further comprises polishing or cutting or plating a surface of the multimode optical fiber with an anti-reflective film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011450239.0A CN112363254A (en) | 2020-12-11 | 2020-12-11 | Novel lens array and production method |
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| CN202011450239.0A CN112363254A (en) | 2020-12-11 | 2020-12-11 | Novel lens array and production method |
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| CN112363254A true CN112363254A (en) | 2021-02-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113451872A (en) * | 2021-06-28 | 2021-09-28 | 长春理工大学 | Quick start intermediate infrared laser and corresponding polycrystal switching device |
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| CN102073098A (en) * | 2010-11-29 | 2011-05-25 | 烽火通信科技股份有限公司 | Broadband multi-mode optical fiber and manufacturing method thereof |
| CN204405899U (en) * | 2014-12-15 | 2015-06-17 | 哈尔滨工程大学 | A kind of multi-fiber connector based on gradient-index lens |
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2020
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| US4405207A (en) * | 1981-01-12 | 1983-09-20 | Xerox Corporation | Method of assembling a gradient index lens array having reduction properties |
| JPS60225113A (en) * | 1984-04-10 | 1985-11-09 | ゼロツクス コーポレーシヨン | Optical apparatus for image transmission |
| CN1781041A (en) * | 2002-12-31 | 2006-05-31 | 康宁股份有限公司 | Small mode-field fiber lens and manufacture thereof |
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Application publication date: 20210212 |