CN112213824A - Wavelength division assembly and preparation method thereof - Google Patents
Wavelength division assembly and preparation method thereof Download PDFInfo
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- CN112213824A CN112213824A CN202011180329.2A CN202011180329A CN112213824A CN 112213824 A CN112213824 A CN 112213824A CN 202011180329 A CN202011180329 A CN 202011180329A CN 112213824 A CN112213824 A CN 112213824A
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- 238000002360 preparation method Methods 0.000 title description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 342
- 239000007888 film coating Substances 0.000 claims abstract description 108
- 238000009501 film coating Methods 0.000 claims abstract description 108
- 238000000576 coating method Methods 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000003292 glue Substances 0.000 claims description 41
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 6
- 239000000853 adhesive Substances 0.000 description 22
- 230000001070 adhesive effect Effects 0.000 description 22
- 238000007747 plating Methods 0.000 description 4
- 230000002441 reversible effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
- G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
- G02B6/29365—Serial cascade of filters or filtering operations, e.g. for a large number of channels in a multireflection configuration, i.e. beam following a zigzag path between filters or filtering operations
- G02B6/29367—Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer
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Abstract
The invention provides a wavelength division assembly, which comprises a first optical filter and an i +1 th optical filter; the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film; the (i + 1) th optical filter is provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surface is coated with an (i + 1) th WDM film; the first WDM coating transmits light of a different wavelength than the i +1 th WDM film. The invention cancels the traditional glass blocks and reduces the number of parts; the optical filter participates in the refraction and reflection of light, so that the design size of the optical filter is enlarged, and the size limit of the optical filter in the miniaturization process of products is reduced. The optical filter has the light splitting function, so that the wave splitting precision of the whole wave division component is improved, the optical filter replaces the original glass block, the volume of the whole wave division component is reduced, and the wave splitting with smaller light ray space can be realized.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a wavelength division component and a preparation method thereof.
Background
In the prior art, a wavelength division module generally employs a monolithic glass block, one side of the glass block is coated with a film, the other side of the glass block is provided with an optical filter, when incident light enters from the coated side of the glass block, the incident light is refracted in the glass block, and reflected or transmitted after reaching the optical filter, so that light rays are separated independently, and the function of wavelength division is completed.
However, the wavelength division module in the prior art is limited by the size of the optical filter, and the optical filters of 0.25mm cannot be used in batch, and the whole wavelength division module has a large volume, and cannot realize wavelength division with smaller light ray spacing.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a wavelength division component and a preparation method thereof.
The technical scheme of the invention is summarized as follows:
the invention provides a wavelength division assembly, which comprises a first optical filter and an i +1 th optical filter, wherein i is greater than or equal to one;
the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film;
the (i + 1) th optical filter is provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surface is coated with an (i + 1) th WDM film; the first WDM coating layer transmits light of a different wavelength than the (i + 1) th WDM film.
Further, the filter comprises a first filter, a second filter, a third filter and a fourth filter;
the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film;
the second optical filter, the third optical filter and the fourth optical filter are respectively provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surfaces of the second optical filter, the third optical filter and the fourth optical filter are respectively coated with a second WDM film, a third WDM film and a fourth WDM film;
the wavelengths of the light rays transmitted by the first WDM film, the second WDM film, the third WDM film and the fourth WDM film are different.
Furthermore, the first optical filter, the second optical filter, the third optical filter and the fourth optical filter are sequentially arranged to form a parallelogram structure, the first film coating surface is flush with the third film coating surface, and the second film coating surface is flush with the fourth film coating surface.
Furthermore, a first optical matching adhesive is coated between the first optical filter and the second optical filter, and the refractive index of the first optical matching adhesive is linearly related to the refractive index of the first optical filter or the second optical filter.
Furthermore, a second optical matching adhesive is coated between the second optical filter and the third optical filter, and the refractive index of the second optical matching adhesive is linearly related to the refractive index of the second optical filter or the third optical filter.
Furthermore, a third optical matching adhesive is coated between the third optical filter and the fourth optical filter, and the refractive index of the third optical matching adhesive is linearly related to the refractive index of the third optical filter or the fourth optical filter.
Furthermore, the first optical filter, the second optical filter, the third optical filter and the fourth optical filter are all in the same parallelogram structure.
Accordingly, the present invention also provides a method for manufacturing a wavelength division module, which is used for manufacturing the wavelength division module as described in any one of the above, comprising:
sequentially arranging a first optical filter and an i +1 optical filter, wherein i +1 is greater than or equal to one;
the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film;
the (i + 1) th optical filter is provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surface is coated with an (i + 1) th WDM film;
wherein the first WDM coating layer and the (i + 1) th WDM film transmit light with different wavelengths.
Further, the arranging the first optical filter and the ith optical filter in sequence further includes:
and coating ith optical matching glue between the first optical filter and the adjacent (i + 1) th optical filter, wherein the refractive index of the ith optical matching glue is linearly related to that of the first optical filter or the adjacent (i + 1) th optical filter.
Compared with the prior art, the invention has the beneficial effects that: the wavelength division assembly provided by the invention cancels the existence of the traditional glass block, and reduces the number of parts; the optical filter participates in the refraction and reflection of light, so that the design size of the optical filter is enlarged, and the size limit of the optical filter in the miniaturization process of products is reduced. The optical filter has the light splitting function, so that the wave splitting precision of the whole wave division component is improved, the optical filter replaces the original glass block, the volume of the whole wave division component is reduced, and the wave splitting with smaller light ray space can be realized.
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 view of a wavelength division module of the present invention;
FIG. 2 is a schematic view of an optical filter in a wavelength division module according to the present invention;
FIG. 3 is a flow chart of a method of fabricating a wavelength division module according to the present invention.
Reference numerals: 1. a first optical filter; 2. a second optical filter; 3. a third optical filter; 4. a fourth optical filter; 5. an anti-reflection film; 6. high-reflection film; 7. incident light; 8. light of a first wavelength; 9. light of a second wavelength; 10. a light of a third wavelength; 11. a fourth wavelength of light; 12. a first optical matching glue; 13. a second optical matching glue; 14. a third optical matching glue; 111. a first film-coated surface; 112. a second film-coated surface; 113. a first included angle; 114. and a second included angle.
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.
Example 1:
the invention relates to a wavelength division component, which comprises a first optical filter and an i +1 th optical filter, wherein i is greater than or equal to one.
The first optical filter and the (i + 1) th optical filter are in parallelogram structures with the same size. The first optical filter and the (i + 1) th optical filter are sequentially arranged to form a parallelogram structure. The first optical filter and the (i + 1) th optical filter can transmit light rays with different wavelengths.
Specifically, the optical filter has four surfaces, the left side and the right side are respectively a first coating surface, a second coating surface or a third coating surface and a fourth coating surface, and the upper side and the lower side are bonding surfaces for coating optical matching glue. The included angle between the first coating surface and the lower connecting surface is the same as the included angle between the second coating surface and the upper connecting surface.
The first optical filter is provided with a first film coating surface and a second film coating surface, the (i + 1) th optical filter is provided with a third film coating surface and a fourth film coating surface, and after the first optical filter and the (i + 1) th optical filter are arranged, the first film coating surface is parallel and level to the third film coating surface, and the second film coating surface is parallel and level to the fourth film coating surface.
The first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film; the third film coating surface is coated with a high-reflection film, and the fourth film coating surface is coated with an i +1 th WDM film, wherein the wavelength of light transmitted by the first WDM coating is different from that of light transmitted by the i +1 th WDM film.
Among them, an antireflection film (AR coating) is a surface optical coating that increases the transmittance of light at the surface by reducing reflected light. The antireflection film utilizes the principle of light interference to cause light reflected by the front surface and the back surface of the film to interfere. Highly reflective films, also called highly reflective films, are optical elements in which most or almost all of the incident light energy is reflected back. The WDM films are wavelength division multiplexing films or wavelength division multiplexing coatings, each of which is prepared to transmit light of a certain wavelength and reflect light that is not transmitted.
In the present invention, the wavelength of light that the (i + 1) th WDM film can transmit is the same as the wavelength of light that the (i + 1) th filter can transmit.
And coating optical matching glue between two adjacent optical filters, wherein the refractive index of the optical matching glue is linearly related to the refractive index of one of the two adjacent optical filters.
Preferably, the refractive index of the optical matching glue coated between two adjacent optical filters is +/-0.02 of the refractive index of one of the two adjacent optical filters. It is understood that the difference between the refractive index of the optical matching paste applied between two adjacent filters and the refractive index of one of the two adjacent filters is in the range of-0.02 to + 0.02. For example, one of the adjacent two filters has a refractive index of 1.5, and the optical matching glue coated between the adjacent two filters has a refractive index of 1.48-1.52.
The optical matching glue is smeared between the two adjacent optical filters, so that the two adjacent optical filters are firmly bonded, and meanwhile, light rays pass through the interface between the two adjacent optical filters with minimum loss.
When the wavelength division component provided by the invention is used for partial wave, incident light is incident from the antireflection film of the first optical filter, is refracted in the first optical filter and reaches the second film coating surface of the first optical filter, and the second film coating surface is coated with the first WDM film, so that part of wavelengths are transmitted and other wavelengths are reflected; the light is reflected by the high reflection film of the (i + 1) th optical filter and is folded back to the fourth film coating surface of the (i + 1) th optical filter, and the (i + 1) th WDM film is coated on the fourth film coating surface and penetrates through different wavelengths to realize wave division.
When the wavelength division component provided by the invention is used for wave combination, according to the reversible principle of an optical path, if incident light rays are respectively incident from the direction of the wavelength division component WDM film, the wavelength division component can complete the wave combination of a plurality of wavelengths into one path.
The wavelength division assembly provided by the invention cancels the existence of the traditional glass block, and reduces the number of parts; the optical filter participates in the refraction and reflection of light, so that the design size of the optical filter is enlarged, and the size limit of the optical filter in the miniaturization process of products is reduced. The optical filter has the light splitting function, so that the wave splitting precision of the whole wave division component is improved, the optical filter replaces the original glass block, the volume of the whole wave division component is reduced, and the wave splitting with smaller light ray space can be realized.
Example 2:
the embodiment in which i is equal to one in the first embodiment is the second embodiment.
As shown in fig. 1-2, a wavelength division assembly includes a first optical filter 1, a second optical filter 2, a third optical filter 3, and a fourth optical filter 4. The first filter 1, the second filter 2, the third filter 3 and the fourth filter 4 can transmit light beams with different wavelengths.
The first filter, the second filter 2, the third filter 3 and the fourth filter 4 are parallelogram structures with the same size. The first filter, the second filter 2, the third filter 3 and the fourth filter 4 are arranged in sequence to form a parallelogram structure. The first filter, the second filter 2, the third filter 3 and the fourth filter 4 can transmit light with different wavelengths.
The optical filter is provided with four surfaces, the left side and the right side are respectively a first film coating surface, a second film coating surface or a third film coating surface and a fourth film coating surface, and the upper side and the lower side are bonding surfaces for coating optical matching glue. The included angle between the first coating surface and the lower connecting surface is the same as the included angle between the second coating surface and the upper connecting surface.
Specifically, referring to fig. 2, the first optical filter has four surfaces, a first film coating surface 111 and a second film coating surface 112 are respectively disposed on the left and right sides, and the upper and lower surfaces are bonding surfaces for applying optical matching glue. The first included angle 113 between the first plating surface 111 and the lower connecting surface is the same as the second included angle 114 between the second plating surface 112 and the upper connecting surface.
The first optical filter 1 is provided with a first film coating surface 111 and a second film coating surface 112, and the second optical filter 2, the third optical filter 3 and the fourth optical filter 4 are provided with a third film coating surface and a fourth film coating surface.
The first optical filter 1, the second optical filter 2, the third optical filter 3 and the fourth optical filter 4 are all in the same parallelogram structure. The first optical filter 1, the second optical filter 2, the third optical filter 3 and the fourth optical filter 4 are sequentially arranged to form a parallelogram structure, the first film coating surface 111 is flush with the third film coating surface, and the second film coating surface 112 is flush with the fourth film coating surface.
The first plating surface 111 is plated with an antireflection film 5, and the second plating surface 112 is plated with a first WDM film.
The third film coating surface is coated with a high-reflection film 6, and the fourth film coating surfaces of the second optical filter 2, the third optical filter 3 and the fourth optical filter 4 are respectively coated with a second WDM film, a third WDM film and a fourth WDM film.
Among them, an antireflection film (AR coating) is a surface optical coating that increases the transmittance of light at the surface by reducing reflected light. The antireflection film utilizes the principle of light interference to cause light reflected by the front surface and the back surface of the film to interfere. Highly reflective films, also called highly reflective films, are optical elements in which most or almost all of the incident light energy is reflected back. The WDM films are wavelength division multiplexing films or wavelength division multiplexing coatings, each of which is prepared to transmit light of a certain wavelength and reflect light which is not projected.
The first WDM film, the second WDM film, the third WDM film and the fourth WDM film transmit light with different wavelengths.
And coating optical matching glue between two adjacent optical filters, wherein the refractive index of the optical matching glue is linearly related to the refractive index of one of the two adjacent optical filters.
Preferably, the refractive index of the optical matching glue coated between two adjacent optical filters is +/-0.02 of the refractive index of one of the two adjacent optical filters. It is understood that the difference between the refractive index of the optical matching paste applied between two adjacent filters and the refractive index of one of the two adjacent filters is in the range of-0.02 to + 0.02. For example, one of the adjacent two filters has a refractive index of 1.5, and the optical matching glue coated between the adjacent two filters has a refractive index of 1.48-1.52.
The optical matching glue is smeared between the two adjacent optical filters, so that the two adjacent optical filters are firmly bonded, and meanwhile, light rays pass through the interface between the two adjacent optical filters with minimum loss.
Specifically, a first optical matching adhesive 12 is coated between the first optical filter 1 and the second optical filter 2, and the refractive index of the first optical matching adhesive 12 is linearly related to the refractive index of the first optical filter 1 or the second optical filter 2. The difference between the refractive index of the first optical matching glue 12 and the refractive index of the first optical filter 1 or the second optical filter 2 is in the range of-0.02 to + 0.02.
A second optical matching adhesive 13 is coated between the second optical filter 2 and the third optical filter 3, and the refractive index of the second optical matching adhesive 13 is linearly related to the refractive index of the second optical filter 2 or the third optical filter 3. The difference between the refractive index of the second optical matching glue 13 and the refractive index of the second optical filter 2 or the third optical filter 3 is in the range of-0.02 to + 0.02.
A third optical matching adhesive 14 is coated between the third optical filter 3 and the fourth optical filter 4, and the refractive index of the third optical matching adhesive 14 is linearly related to the refractive index of the third optical filter 3 or the fourth optical filter 4. The difference between the refractive index of the third optical matching glue 14 and the refractive index of the third optical filter 3 or the fourth optical filter 4 is in the range of-0.02 to + 0.02.
In the invention, the optical matching glue is smeared between two adjacent optical filters, so that the two adjacent optical filters are firmly bonded, and meanwhile, light rays pass through the interface between the two adjacent optical filters with minimum loss.
When the wavelength division component provided by the invention is used for wavelength division, an incident light 7 is incident from the antireflection film 5 of the first optical filter 1 and is refracted in the first optical filter 1 to reach the second coating surface 112 of the first optical filter 1, as the first WDM film is coated on the second coating surface, a light 8 with a first wavelength which can be transmitted by the first WDM film is transmitted, and lights with other wavelengths are reflected, and the light 8 with the first wavelength passes through the first optical filter 1 and leaves the wavelength division component.
The light which is not transmitted by the first WDM film passes through the first optical matching glue 12 between the first optical filter 1 and the second optical filter 2 to reach the second optical filter 2, and then continuously transmits to the high reflection film 6 at the left side of the second optical filter to form reflection, and then returns to the right side surface of the second optical filter 2, because the second WDM film is plated on the right side surface of the second optical filter 2, the second WDM film is designed to transmit the light of the light 9 with the second wavelength, and the light of the other wavelengths is reflected. The light rays 9 of the second wavelength pass through the second filter 2 and leave the wavelength division component.
The light which is not transmitted through the second WDM film passes through the second optical matching glue 13 between the second optical filter 2 and the third optical filter 3 to reach the third optical filter 3, and since the third WDM film is plated on the right side surface of the third optical filter 3, the third WDM film is designed to transmit the light of the light 10 of the third wavelength and reflect the light of the remaining wavelengths. The light 10 of the third wavelength passes through the third filter 3 and exits the wavelength division component.
The light which is not transmitted by the third WDM film passes through the third optical matching adhesive 14 between the third optical filter 3 and the fourth optical filter 4 to reach the fourth optical filter 4, and since the fourth WDM film is plated on the right side surface of the fourth optical filter 4, the fourth WDM film is designed to transmit the light of the light 11 of the fourth wavelength and reflect the light of the other wavelengths. The fourth wavelength light 11 passes through the fourth filter 3 and exits the wavelength division assembly.
The transmission of different wavelengths is realized by the process so as to realize the wave splitting. When the wavelength division component provided by the invention is used for wave combination, according to the reversible principle of an optical path, if incident light 7 is respectively incident from the direction of the wavelength division component WDM film, the wavelength division component can complete the wave combination of multiple wavelengths into one path.
The wavelength division assembly provided by the invention cancels the existence of the traditional glass block, and reduces the number of parts; the optical filter participates in the refraction and reflection of light, so that the design size of the optical filter is enlarged, and the size limit of the optical filter in the miniaturization process of products is reduced. The optical filter has the light splitting function, so that the wave splitting precision of the whole wave division component is improved, the optical filter replaces the original glass block, the volume of the whole wave division component is reduced, and the wave splitting with smaller light ray space can be realized.
Example 3:
as shown in fig. 3, the present invention further provides a method for preparing a wavelength division module, which is used to prepare the wavelength division module according to the first embodiment, and includes:
s1, arranging the first optical filter and the (i + 1) th optical filter in sequence, wherein i +1 is greater than or equal to one;
s3, the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film;
the (i + 1) th optical filter is provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surface is coated with an (i + 1) th WDM film;
wherein the first WDM coating layer and the (i + 1) th WDM film transmit light with different wavelengths.
The first optical filter and the ith optical filter are arranged in sequence, and then the method further comprises the following steps:
s2, coating the ith optical matching glue between the first optical filter and the adjacent (i + 1) th optical filter, wherein the refractive index of the ith optical matching glue is linearly related to that of the first optical filter or the adjacent (i + 1) th optical filter.
And coating optical matching glue between two adjacent optical filters, wherein the refractive index of the optical matching glue is linearly related to the refractive index of one of the two adjacent optical filters.
Preferably, the refractive index of the optical matching glue coated between two adjacent optical filters is +/-0.02 of the refractive index of one of the two adjacent optical filters. It is understood that the difference between the refractive index of the optical matching paste applied between two adjacent filters and the refractive index of one of the two adjacent filters is in the range of-0.02 to + 0.02. For example, one of the adjacent two filters has a refractive index of 1.5, and the optical matching glue coated between the adjacent two filters has a refractive index of 1.48-1.52.
The optical matching glue is smeared between the two adjacent optical filters, so that the two adjacent optical filters are firmly bonded, and meanwhile, light rays pass through the interface between the two adjacent optical filters with minimum loss.
Example 4:
the present invention also provides a method for manufacturing a wavelength division module, which is used for manufacturing the wavelength division module according to embodiment 2 above, and includes:
s1, arranging the first optical filter 1, the second optical filter 2, the third optical filter 3 and the fourth optical filter 4 in sequence;
s2, applying a first optical matching adhesive 12 between the first optical filter 1 and the second optical filter 2, applying a second optical matching adhesive 13 between the second optical filter 2 and the third optical filter 3, and applying a third optical matching adhesive 14 between the third optical filter 3 and the fourth optical filter 4.
And coating optical matching glue between two adjacent optical filters, wherein the refractive index of the optical matching glue is linearly related to the refractive index of one of the two adjacent optical filters.
Preferably, the refractive index of the optical matching glue coated between two adjacent optical filters is +/-0.02 of the refractive index of one of the two adjacent optical filters. It is understood that the difference between the refractive index of the optical matching paste applied between two adjacent filters and the refractive index of one of the two adjacent filters is in the range of-0.02 to + 0.02. For example, one of the adjacent two filters has a refractive index of 1.5, and the optical matching glue coated between the adjacent two filters has a refractive index of 1.48-1.52.
Specifically, a first optical matching adhesive 12 is coated between the first optical filter 1 and the second optical filter 2, and the refractive index of the first optical matching adhesive 12 is linearly related to the refractive index of the first optical filter 1 or the second optical filter 2. The difference between the refractive index of the first optical matching glue 12 and the refractive index of the first optical filter 1 or the second optical filter 2 is in the range of-0.02 to + 0.02.
A second optical matching adhesive 13 is coated between the second optical filter 2 and the third optical filter 3, and the refractive index of the second optical matching adhesive 13 is linearly related to the refractive index of the second optical filter 2 or the third optical filter 3. The difference between the refractive index of the second optical matching glue 13 and the refractive index of the second optical filter 2 or the third optical filter 3 is in the range of-0.02 to + 0.02.
A third optical matching adhesive 14 is coated between the third optical filter 3 and the fourth optical filter 4, and the refractive index of the third optical matching adhesive 14 is linearly related to the refractive index of the third optical filter 3 or the fourth optical filter 4. The difference between the refractive index of the third optical matching glue 14 and the refractive index of the third optical filter 3 or the fourth optical filter 4 is in the range of-0.02 to + 0.02.
In the invention, the optical matching glue is smeared between two adjacent optical filters, so that the two adjacent optical filters are firmly bonded, and meanwhile, light rays pass through the interface between the two adjacent optical filters with minimum loss.
S3, the first optical filter 1 is provided with a first film coating surface 111 and a second film coating surface 112, the first film coating surface 111 is coated with an antireflection film 5, and the second film coating surface 112 is coated with a first WDM film;
the second optical filter 2, the third optical filter 3 and the fourth optical filter 4 are respectively provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high reflection film 6, and the fourth film coating surfaces of the second optical filter 2, the third optical filter 3 and the fourth optical filter 4 are respectively coated with a second WDM film, a third WDM film and a fourth WDM film.
Wherein, the first WDM coating and the second WDM film, the third WDM film and the fourth WDM film transmit light with different wavelengths.
The wavelength division assemblies prepared in the third embodiment and the fourth embodiment eliminate the existence of the traditional glass block, and reduce the number of parts; the optical filter participates in the refraction and reflection of light, so that the design size of the optical filter is enlarged, and the size limit of the optical filter in the miniaturization process of products is reduced. The optical filter has the light splitting function, so that the wave splitting precision of the whole wave division component is improved, the optical filter replaces the original glass block, the volume of the whole wave division component is reduced, and the wave splitting with smaller light ray space can be realized.
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 embodiments of the preparation method correspond to the embodiments of the wavelength division component, and reference may be made to the foregoing embodiments of the wavelength division component for the omission.
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 (9)
1. A wavelength division component is characterized by comprising a first optical filter and an i +1 th optical filter, wherein i is greater than or equal to one;
the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film;
the (i + 1) th optical filter is provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surface is coated with an (i + 1) th WDM film; the first WDM coating layer transmits light of a different wavelength than the (i + 1) th WDM film.
2. The wavelength division element of claim 1, comprising a first filter, a second filter, a third filter and a fourth filter;
the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film;
the second optical filter, the third optical filter and the fourth optical filter are respectively provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surfaces of the second optical filter, the third optical filter and the fourth optical filter are respectively coated with a second WDM film, a third WDM film and a fourth WDM film;
the wavelengths of the light rays transmitted by the first WDM film, the second WDM film, the third WDM film and the fourth WDM film are different.
3. The wavelength division module of claim 2, wherein the first, second, third and fourth filters are arranged in sequence to form a parallelogram structure, the first coated side being flush with the third coated side, and the second coated side being flush with the fourth coated side.
4. The wavelength division module of claim 2, wherein a first optical matching gel is applied between the first optical filter and the second optical filter, and a refractive index of the first optical matching gel is linearly related to a refractive index of the first optical filter or the second optical filter.
5. The wavelength division module of claim 2, wherein a second optical matching gel is applied between the second optical filter and the third optical filter, and a refractive index of the second optical matching gel is linearly related to a refractive index of the second optical filter or the third optical filter.
6. The wavelength division module of claim 2, wherein a third optical matching gel is applied between the third optical filter and the fourth optical filter, and a refractive index of the third optical matching gel is linearly related to a refractive index of the third optical filter or the fourth optical filter.
7. The wavelength division module of claim 2, wherein the first, second, third, and fourth filters are all identical parallelogram structures.
8. A method for producing a wavelength division module according to any one of claims 1 to 7, comprising:
sequentially arranging a first optical filter and an i +1 optical filter, wherein i +1 is greater than or equal to one;
the first optical filter is provided with a first film coating surface and a second film coating surface, the first film coating surface is coated with an antireflection film, and the second film coating surface is coated with a first WDM film;
the (i + 1) th optical filter is provided with a third film coating surface and a fourth film coating surface, the third film coating surface is coated with a high-reflection film, and the fourth film coating surface is coated with an (i + 1) th WDM film;
wherein the first WDM coating layer and the (i + 1) th WDM film transmit light with different wavelengths.
9. The method of manufacturing a wavelength division module according to claim 8, wherein the first optical filter and the ith optical filter are sequentially arranged, and thereafter, the method further comprises:
and coating ith optical matching glue between the first optical filter and the adjacent (i + 1) th optical filter, wherein the refractive index of the ith optical matching glue is linearly related to that of the first optical filter or the adjacent (i + 1) th optical filter.
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