CN113534362A - Close-range dual-wavelength array coupling lens - Google Patents
Close-range dual-wavelength array coupling lens Download PDFInfo
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- CN113534362A CN113534362A CN202110621791.XA CN202110621791A CN113534362A CN 113534362 A CN113534362 A CN 113534362A CN 202110621791 A CN202110621791 A CN 202110621791A CN 113534362 A CN113534362 A CN 113534362A
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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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention provides a close-range dual-wavelength array coupling lens, wherein a laser output unit of the lens comprises two groups of light sources; the lens body is used for changing the light path emitted by the laser output unit, and the two groups of light sources are distributed on the light incident side of the lens body at intervals; the lens body is provided with a reflecting surface corresponding to each group of light sources and used for reflecting light beams emitted by the two groups of light sources in a gathering manner; the filter is arranged on the lens body, the projection of the filter to the light inlet side is positioned between the two groups of light sources, two opposite side surfaces of the filter are respectively an anti-reflection surface and a filtering surface, and the two groups of light beams reflected by the reflection surface are respectively transmitted and reflected by the anti-reflection surface and the filtering surface to form combined light beams; the coupling lens is arranged on the light-emitting side of the lens body and is positioned on the extension line of the combined light beam, and the coupling lens couples the combined light beam into the optical fiber. The invention realizes the combination of parallel communication and wavelength division multiplexing, reduces the process difficulty and improves the transmission rate.
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a close-range dual-wavelength array coupling lens.
Background
In optical communication, a multimode optical fiber is generally adopted for near field communication, and a VCSEL light source with the light source of 850nm is adopted. In order to increase the transmission rate, parallel communication or wavelength division multiplexing is generally used. When a multi-mode parallel communication system is adopted, the number of required array lenses is increased along with the further improvement of the transmission rate, and great challenges are brought to the injection molding of the lenses. When a multimode wavelength division multiplexing system is adopted, the number of subdivided wavelengths is more and more along with the further improvement of the transmission rate, and the light splitting mode is usually realized through a film coating mode, so that the requirements on the film coating are extremely high, the yield is low, and the batch production price of products is higher.
The patent of publication No. CN207730981U discloses an optical assembly for realizing multimode light splitting, which includes a multimode optical fiber, a drum lens, a wavelength division multiplexer, multiple filters, multiple G-lens and multiple converging lenses, wherein the multimode optical fiber transmits light with different wavelengths to the drum lens at an input end, the light is collimated by the drum lens and then transmitted to the inside of the wavelength division multiplexer for multiple reflection, and is transmitted out of each filter to the corresponding G-lens for converging, and the converged light is converged again in the corresponding converging lens, and is transmitted to an external detection chip at an output end. Light rays with different wavelengths emitted by the multimode optical fiber are split at the wavelength division multiplexer, and are further compressed at the output end through the converging lens, so that the light rays are smaller than the size of a photosensitive area of the receiving chip, and higher light signal collecting efficiency is ensured. However, the plurality of filters of the optical component are 4 filters with different models, the requirement on a coating process is high, and crosstalk is easily caused by different channels.
Disclosure of Invention
The invention aims to provide a close-range dual-wavelength array coupling lens to solve the problems that close-range communication multimode optical fibers have high requirements on transmission efficiency and a coating process and crosstalk is easily caused among different channels.
The invention provides the following technical scheme:
a close-range dual-wavelength array coupled lens, comprising:
the laser output unit comprises two groups of light sources;
the lens body is used for changing the light path emitted by the laser output unit, and the two groups of light sources are distributed on the light incident side of the lens body at intervals; the lens body is provided with a reflecting surface corresponding to each group of light sources and used for reflecting light beams emitted by the two groups of light sources in a gathering manner;
the filter is arranged on the lens body, the projection of the filter to the light inlet side is positioned between the two groups of light sources, the two opposite side surfaces of the filter are respectively an anti-reflection surface and a filtering surface, and the two groups of light beams reflected by the reflecting surface are respectively transmitted and reflected by the anti-reflection surface and the filtering surface to form combined light beams;
and the coupling lens is arranged on the light-emitting side of the lens body and is positioned on the extension line of the combined light beam, and the coupling lens couples the combined light beam into an optical fiber.
Preferably, the light sources at the left side and the right side of the filter are a first light source and a second light source respectively, antireflection films corresponding to the wavelengths of the first light source and the second light source respectively are coated on the antireflection surfaces, and an antireflection film corresponding to the wavelength of the first light source and a reflection film corresponding to the wavelength of the second light source are coated on the filtering surface.
Furthermore, a groove is formed in one side, opposite to the light inlet side, of the lens body, a supporting wall is arranged in the groove, the top of the supporting wall inclines towards one side of the light outlet side, and the filter is installed on the supporting wall.
Preferably, the inclination angle of the supporting wall ranges from 75 degrees to 85 degrees; the reflecting surfaces corresponding to the first light source and the second light source are respectively a first reflecting surface and a second reflecting surface, the first reflecting surface and the second reflecting surface incline oppositely, the inclination angle of the first reflecting surface is 45.6-50.6 degrees, and the inclination angle of the second reflecting surface is 50-60 degrees.
Preferably, the two sets of beams reflected by the first and second reflective surfaces substantially coincide where they strike the filter.
Preferably, a compensation wall is arranged on one side, opposite to the support wall, in the slot, the top of the compensation wall inclines towards one side far away from the support wall, and the inclination angle of the compensation wall is 85-89 degrees.
Furthermore, two groups of collimating lenses are arranged on the light inlet side of the lens body and are respectively positioned in front of the two groups of light sources, and are used for collimating the light beams emitted by the two groups of light sources.
Preferably, the collimating lens and the coupling lens are both aspheric lenses.
Preferably, the collimating lens and the coupling lens are both assembled on the lens body in an array.
Preferably, the difference between the central wavelengths of the first light source and the second light source is ± (20-100) nm.
The invention has the beneficial effects that:
the laser output unit, the lens body, the filter and the coupling lens are matched with each other, two opposite side surfaces of the filter are respectively an anti-reflection surface and a filtering surface, two groups of light beams reflected by the reflecting surface of the lens body are respectively anti-reflection and reflection by the anti-reflection surface and the filtering surface to form a combined light beam, and then the combined light beam is coupled into the optical fiber by the coupling lens, so that the parallel communication and wavelength division multiplexing are combined, the process difficulty is reduced, and the transmission rate is improved.
Compared with the existing multimode beam splitting optical component, the filter used by the invention only needs one type, has low requirement on a coating process, can increase the interval of two different wavelengths to 100nm, is easy to coat, and cannot cause crosstalk between different channels.
The traditional parallel communication is only that the number of transmission channels is increased, and under the condition of the same speed, the invention adopts dual-wavelength division multiplexing, reduces the number of the transmission channels by half, and improves the process feasibility of lens injection molding.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a diagram of an optical path when the contact surface of the filter and the supporting wall is an anti-reflection surface;
FIG. 3 is a diagram of the optical path when the contact surface of the filter of the present invention with the supporting wall is the filtering surface;
FIG. 4 is a schematic diagram of the filter structure of the present invention;
fig. 5 is a schematic top view of the present invention.
Labeled as: 1. a first light source; 2. a second light source; 3. a lens body; 4. a filter; 5. a coupling lens; 6. a first reflective surface; 7. a second reflective surface; 8. grooving; 9. a support wall; 10. an anti-reflection surface; 11. a filtering surface; 12. combining the light beams; 13. a light incident side; 14. a light emitting side; 15. a compensation wall; 16. a collimating lens; 17. an optical fiber.
Detailed Description
Example 1
As shown in fig. 1, a close-range two-wavelength array coupling lens includes a laser output unit, a lens body 3, a filter 4, and a coupling lens 5.
The laser output unit comprises two groups of light sources, namely a group of first light sources 1 and a group of second light sources 2, and the central wavelength difference range of the two light sources is +/-20-100 nm. Both sets of light sources are VCSEL light sources.
The lens body 3 is used for changing the light path emitted by the laser output unit, and the two groups of light sources are distributed at the light incident side 13 of the lens body at intervals, for example, in this embodiment, the first light source 1 is located on the left side of the light incident side 13 of the lens body, and the second light source 2 is located on the right side of the light incident side 13 of the lens body.
The lens body 3 is provided with a reflecting surface corresponding to each group of light sources and used for reflecting light beams emitted by the two groups of light sources in a gathering manner, and the reflecting surface can be a plated or adhered reflecting film. Wherein, the reflecting surfaces corresponding to the first light source 1 and the second light source 2 are a first reflecting surface 6 and a second reflecting surface 7 respectively, and the positions of the two groups of light beams reflected by the first reflecting surface 6 and the second reflecting surface 7 hitting the filter 4 are basically coincident. The first reflecting surface 6 and the second reflecting surface 7 are inclined to each other, the inclination angle A1 of the first reflecting surface 6 is 45.6-50.6 DEG, and the inclination angle A4 of the second reflecting surface 7 is 50-60 deg.
The filter 4 is installed on the lens body 3 and the projection of the filter 4 to the light-in side 13 is located between the two groups of light sources, in this embodiment, a slot 8 is arranged on the side of the lens body opposite to the light-in side 13, a supporting wall 9 is arranged in the slot 8, the top of the supporting wall 9 inclines to one side of the light-out side 14, and the inclination angle a3 of the supporting wall 9 is 75-85 degrees; the filter 4 is mounted on a supporting wall 9.
As shown in fig. 2, two opposite side surfaces of the filter 4 are an anti-reflection surface 10 and a filter surface 11, respectively, and two groups of light beams reflected by the reflection surface of the lens body are transmitted and reflected by the anti-reflection surface 10 and the filter surface 11, respectively, to form a combined light beam 12; specifically, antireflection films corresponding to the wavelengths of the first light source 1 and the second light source 2 are plated on the antireflection surface 10, and an antireflection film corresponding to the wavelength of the first light source 1 and a reflection film corresponding to the wavelength of the second light source 2 are plated on the filter surface 11. The contact surface of the filter 4 with the supporting wall 9 may be any one of an antireflection surface 10 and a filter surface 11.
The right side of the lens body 3 is a light-emitting side 14, the light-emitting side 14 is substantially perpendicular to the light-entering side 13, the coupling lens 5 is located on the light-emitting side 14 of the lens body, is located on an extension line of the combined light beam 12 and is perpendicular to the extension line, and the coupling lens 5 couples the combined light beam 12 into the optical fiber 17. The coupling lens 5 may be injection molded integrally with the lens body 3.
As shown in fig. 3, the optical path operation state when the contact surface between the filter 4 and the supporting wall 9 is the anti-reflection surface 10 is as follows:
the light beam emitted by the first light source 1 reaches the first reflecting surface 6, the first reflecting surface 6 reflects and turns the light beam and then irradiates the light beam onto the filter 4, the light beam is transmitted twice by the filter 4 and then irradiates the light beam onto the coupling lens 5, and the light beam is coupled into the optical fiber 17 through the coupling lens 5.
The light beam emitted by the second light source 2 reaches the second reflecting surface 7, the second reflecting surface 7 reflects and turns the light beam and then the light beam is emitted to the filter 4, the light beam is transmitted and reflected by the filter 4 and then emitted to the coupling lens 5, and the light beam is coupled into the optical fiber 17 through the coupling lens 5. The light beams of the first light source 1 and the second light source 2 passing through the filter 4 form a parallel combined light beam 12 and then enter the coupling lens 5.
As shown in fig. 4, the optical path operation state when the contact surface of the filter 4 with the support wall 9 is the filter surface 11 is as follows:
the light beam emitted by the first light source 1 reaches the first reflecting surface 6, the first reflecting surface 6 reflects and turns the light beam and then irradiates the light beam onto the filter 4, the light beam is transmitted twice by the filter 4 and then irradiates the light beam onto the coupling lens 5, and the light beam is coupled into the optical fiber 17 through the coupling lens 5.
The light beam emitted by the second light source 2 reaches the second reflecting surface 7, the second reflecting surface 7 reflects and turns the light beam and then the light beam is emitted to the filter 4, the light beam is reflected by the filter 4 and then emitted to the coupling lens 5, and the light beam is coupled into the optical fiber 17 through the coupling lens 5. The light beams of the first light source 2 and the second light source 2 passing through the filter 4 form a parallel combined light beam 12 and then enter the coupling lens 5.
Example 2
The present embodiment differs from embodiment 1 in that a compensation wall 15 is provided in the slot 8 on the side opposite to the support wall 9, the top of the compensation wall 15 is inclined to the side away from the support wall 9, and the inclination angle a2 of the compensation wall 9 is 85-89 °. The function of the inclined compensation wall is: on one hand, the inclined compensation wall 15 and the support wall 9 form a groove body with a horn-shaped opening, so that smooth demolding is facilitated during injection molding; on the other hand, because the compensation wall is slightly inclined, the light beam reflected by the first reflecting surface enters the air medium through the inclined compensation wall to be refracted, so that the angle of the light beam is finely adjusted to be just overlapped with the light beam reflected by the second reflecting surface on the filter, and the light beam passing through the filter can enter the coupling lens along the horizontal direction, and the high-precision coupling effect is realized.
The light incident side 13 of the lens body of this embodiment is further provided with two sets of collimating lenses 16, the collimating lenses 16 can be integrally injection-molded with the lens body, and the two sets of collimating lenses 16 are respectively located right in front of the two sets of light sources to collimate light beams emitted by the two sets of light sources. The collimating lens 16 and the coupling lens 5 are aspheric lenses, and have better curvature radius, so that good aberration correction can be maintained. As shown in fig. 5, the collimating lenses 16 and the coupling lenses 5 are assembled on the lens body 3 in an array.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A close-proximity dual-wavelength array coupled lens, comprising:
the laser output unit comprises two groups of light sources;
the lens body is used for changing the light path emitted by the laser output unit, and the two groups of light sources are distributed on the light incident side of the lens body at intervals; the lens body is provided with a reflecting surface corresponding to each group of light sources and used for reflecting light beams emitted by the two groups of light sources in a gathering manner;
the filter is arranged on the lens body, the projection of the filter to the light inlet side is positioned between the two groups of light sources, the two opposite side surfaces of the filter are respectively an anti-reflection surface and a filtering surface, and the two groups of light beams reflected by the reflecting surface are respectively transmitted and reflected by the anti-reflection surface and the filtering surface to form combined light beams;
and the coupling lens is arranged on the light-emitting side of the lens body and is positioned on the extension line of the combined light beam, and the coupling lens couples the combined light beam into an optical fiber.
2. The close-proximity dual wavelength array coupled lens of claim 1,
the light sources positioned at the left side and the right side of the filter are respectively a first light source and a second light source;
the anti-reflection surface is covered with anti-reflection films corresponding to the wavelengths of the first light source and the second light source respectively, and the filtering surface is covered with an anti-reflection film corresponding to the wavelength of the first light source and a reflection film corresponding to the wavelength of the second light source.
3. The close-proximity dual wavelength array coupling lens of claim 1, wherein a side of the lens body opposite to the light-incident side is provided with a slot, the slot having a supporting wall therein, a top of the supporting wall being inclined toward the light-emitting side, the filter being mounted on the supporting wall.
4. The close-proximity dual wavelength array coupling lens of claim 3, wherein the support wall has an inclination angle in the range of 75 ° -85 °; the reflecting surfaces corresponding to the first light source and the second light source are respectively a first reflecting surface and a second reflecting surface, the first reflecting surface and the second reflecting surface incline oppositely, the inclination angle of the first reflecting surface is 45.6-50.6 degrees, and the inclination angle of the second reflecting surface is 50-60 degrees.
5. The close-proximity dual wavelength array coupling lens of claim 4, wherein the two sets of beams reflected by the first and second reflective surfaces impinge on the filter at substantially coincident locations.
6. The close-proximity dual wavelength array coupling lens of claim 2, wherein a compensation wall is provided in the groove on a side opposite to the support wall, a top of the compensation wall is inclined to a side away from the support wall, and an inclination angle of the compensation wall is 85 ° to 89 °.
7. The close-range dual-wavelength array coupling lens as claimed in any one of claims 1 to 6, wherein two sets of collimating lenses are disposed on the light incident side of the lens body, and the two sets of collimating lenses are respectively disposed in front of the two sets of light sources for collimating the light beams emitted from the two sets of light sources.
8. The close-proximity dual wavelength array coupling lens of claim 7, wherein the collimating lens and the coupling lens are both aspheric lenses.
9. The close-proximity dual-wavelength array coupling lens of claim 7, wherein the collimating lens and the coupling lens are assembled on the lens body in an array.
10. The close-range dual-wavelength array coupling lens of any one of claims 2 to 6, wherein the difference between the central wavelengths of the first and second light sources is in the range of ± (20-100) nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110621791.XA CN113534362A (en) | 2021-06-03 | 2021-06-03 | Close-range dual-wavelength array coupling lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110621791.XA CN113534362A (en) | 2021-06-03 | 2021-06-03 | Close-range dual-wavelength array coupling lens |
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| CN1761900A (en) * | 2003-03-14 | 2006-04-19 | 安捷伦科技有限公司 | Small form factor all-polymer optical device with integrated dual beam path based on total internal reflection optical turn |
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| US20110057204A1 (en) * | 2009-08-07 | 2011-03-10 | Shimpei Morioka | Optical module |
| CN204028412U (en) * | 2014-09-01 | 2014-12-17 | 北京杏林睿光科技有限公司 | Double-wavelength semiconductor laser beam coupled structure |
| CN110045468A (en) * | 2019-04-30 | 2019-07-23 | 武汉华工正源光子技术有限公司 | A kind of optocoupler seaming element of single fiber bi-directional |
| CN110780396A (en) * | 2019-11-07 | 2020-02-11 | 武汉华工正源光子技术有限公司 | Dual-wavelength multichannel parallel transmission optical assembly |
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2021
- 2021-06-03 CN CN202110621791.XA patent/CN113534362A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1761900A (en) * | 2003-03-14 | 2006-04-19 | 安捷伦科技有限公司 | Small form factor all-polymer optical device with integrated dual beam path based on total internal reflection optical turn |
| CN101266325A (en) * | 2007-03-15 | 2008-09-17 | 日立电线株式会社 | Optical system connection structure, optical component, and optical communication module |
| US20110057204A1 (en) * | 2009-08-07 | 2011-03-10 | Shimpei Morioka | Optical module |
| CN204028412U (en) * | 2014-09-01 | 2014-12-17 | 北京杏林睿光科技有限公司 | Double-wavelength semiconductor laser beam coupled structure |
| CN110045468A (en) * | 2019-04-30 | 2019-07-23 | 武汉华工正源光子技术有限公司 | A kind of optocoupler seaming element of single fiber bi-directional |
| CN110780396A (en) * | 2019-11-07 | 2020-02-11 | 武汉华工正源光子技术有限公司 | Dual-wavelength multichannel parallel transmission optical assembly |
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Application publication date: 20211022 |
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