CN113960719A - Free space multiplex wavelength division multiplexing device and method of turning structure - Google Patents
Free space multiplex wavelength division multiplexing device and method of turning structure Download PDFInfo
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- G—PHYSICS
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- 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
- G02B6/29379—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 characterised by the function or use of the complete device
- G02B6/2938—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 characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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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
- G02B6/29371—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 principle based on material dispersion
- G02B6/29373—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 principle based on material dispersion utilising a bulk dispersive element, e.g. prism
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- G—PHYSICS
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- 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
- G02B6/29379—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 characterised by the function or use of the complete device
- G02B6/29389—Bandpass filtering, e.g. 1x1 device rejecting or passing certain wavelengths
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Abstract
The invention discloses a free space multiplex wavelength division multiplexing device with a turning structure, which comprises an input collimator, a bottom layer output collimator assembly, a bottom layer light splitting assembly, a turning prism, a top layer light splitting assembly and a top layer output collimator assembly, wherein the input collimator is connected with the bottom layer output collimator assembly; the bottom light splitting assembly includes a dual band-pass filter membrane. The invention divides the light of four channels into two paths of light paths through the double-band-pass filter membrane, the transmitted light is reflected to the top light splitting component through the turning prism, and the transmitted light is output by the two top output collimators on the top light splitting component; the reflected light is output in the bottom light splitting assembly through the two bottom output collimators; a free-space multi-path wavelength division multiplexer is formed by utilizing the reflection principle, and light of four channels is output through four output collimators. Compared with the traditional serial wavelength division multiplexing device, the channel with the longest optical path has the advantages that the number of the passing band-pass filters is reduced, and the insertion loss performance is improved.
Description
Technical Field
The present invention relates to the field of optical communications, and in particular, to a free space multiplexing device with a turning structure and a method thereof.
Background
Wavelength division multiplexing is widely used in optical fiber communication, and the transmission capacity of one optical fiber is increased by several times to dozens of times compared with single-wavelength transmission by simultaneously transmitting a plurality of wavelength optical signals on the same optical fiber. The multi-wavelength multiplexing is transmitted in the single-mode optical fiber, and the optical fiber can be greatly saved during large-capacity long-distance transmission. Wavelength division multiplexing generally applies wavelength division multiplexers and demultiplexers which are respectively arranged at two ends of an optical fiber to realize the coupling and separation of different light waves.
Common wavelength division multiplexers include a prism dispersion type wavelength division multiplexer, a fused cone optical fiber type wavelength division multiplexer, a diffraction grating type wavelength division multiplexer, a dielectric film type wavelength division multiplexer, and the like. The prism dispersion type wavelength division multiplexer mainly comprises a prism, and the effect of wavelength division multiplexing is realized by utilizing the light splitting action of the prism; the fused-cone optical fiber type wavelength division multiplexer is a surface interactive device formed by attaching two or more optical fibers together and properly melting, and realizes multiplexing or demultiplexing of different wavelengths by controlling the mutual approaching degree of different optical fibers of a length box at a fused end; the main device of the diffraction grating type wavelength division multiplexer is a diffraction grating which is an optical device formed by dense and equidistant parallel lines, and light beams irradiated on the grating are dispersed according to different wavelengths by utilizing the functions of multi-slit diffraction and interference; the main device of the dielectric film type wavelength division multiplexer is an optical device which is manufactured by alternately stacking materials with high refractive index and low refractive index and utilizing the principle of Fabry-Perot cavity to screen the transmission of specific wavelength and reflect other wavelengths.
The three wavelength division multiplexers, namely the prism dispersion type wavelength division multiplexer, the fused cone fiber type wavelength division multiplexer and the diffraction grating type wavelength division multiplexer, have low isolation degree for other channels due to the principle structure of the three wavelength division multiplexers, and cannot meet the isolation degree requirement when being used for a Tx end; at present, the medium film type wavelength division multiplexer is a mode with higher cost performance and is widely applied.
In a common wavelength division multiplexing optical path structure for communication, the optical path structure can be further divided into a coaxial package, a three-port device package and a Cob package structure according to the package structure. The Cob packaging structure based on the AWG can better realize that incident light and emergent light are positioned on the same incident surface, but because of the inherent characteristics of the AWG, the isolation is insufficient, and the light splitting effect is poor; the Cob package structure based on free space can also use the turning prism to realize this function, but at present, the last path of the Cob package structure is too long, which causes the problem of poor coupling effect of the last light spot, and is not widely used.
In view of the above, it is necessary to develop a new wavelength division multiplexing device to improve the coupling efficiency.
Disclosure of Invention
In order to overcome the problems of the wavelength division multiplexing devices, the present invention provides a free space multiplexing device with a turning structure and a method thereof, which solves the problem of poor coupling effect in the conventional method.
In terms of apparatus and method, the free space multiplexing device of the present invention with a hinge structure for solving the above-mentioned problems comprises: the device comprises an input collimator, a bottom output collimator assembly, a bottom light splitting assembly, a turning prism, a top light splitting assembly and a top output collimator assembly; the bottom light splitting component comprises a double-band-pass filter membrane;
emitting light passes through the input collimator to the bottom light splitting assembly, and is split by the double-band-pass filter membrane on the bottom light splitting assembly, and then reflected path light is output from the bottom output collimator assembly in the bottom light splitting assembly; and the transmission path light is transmitted to the top light splitting assembly through the turning prism and is output from the top output collimator assembly after passing through the top light splitting assembly.
Further, the bottom light splitting assembly further comprises a bottom glass base; the bottom output collimator assembly comprises a first bottom output collimator and a second bottom output collimator; the first bottom layer output collimator and the second bottom layer output collimator are arranged in parallel at equal distance on one side of the bottom layer glass base.
Further, the bottom light splitting assembly further comprises a bottom band-pass membrane; the bottom layer band-pass membrane corresponds to the first bottom layer output collimator;
the double band-pass filter membrane and the bottom layer band-pass membrane are positioned on two side surfaces of the bottom layer glass base; the double bandpass filter membrane corresponds to the turning prism; and after incident light is split by the double band-pass filter diaphragm, reflected path light is split by the bottom layer band-pass diaphragm and then is output by the bottom layer output collimator assembly.
Further, the bottom light splitting assembly further comprises a bottom first antireflection film, a bottom high-reflection film and a bottom second antireflection film; the first antireflection film is opposite to the input collimator, and the first antireflection film and the bottom layer band-pass membrane are positioned on the same side of the bottom layer glass base; the bottom high-reflection film and the double bandpass filter membrane are positioned on the same side of the bottom glass base; the bottom layer second antireflection film corresponds to the second bottom layer output collimator.
Further, the top light splitting assembly comprises a top glass base;
the top output collimator assembly comprises a first top output collimator and a second top output collimator; the first top layer output collimator and the second top layer output collimator are arranged in parallel at equal distance on one side of the top layer glass base.
Further, the top-layer light splitting assembly further comprises a top-layer band-pass membrane; the top layer bandpass membrane corresponds to the first top layer output collimator.
Further, the anti-reflection film comprises a first top anti-reflection film, a high top anti-reflection film and a second top anti-reflection film;
the top layer first antireflection film and the top layer high reflection film are located on the same side of the top layer glass base, the top layer second antireflection film and the top layer band-pass membrane are located on the same side of the top layer glass base, and the top layer second antireflection film corresponds to the second top layer output collimator.
Furthermore, a bottom plate is arranged between the bottom light splitting assembly and the top light splitting assembly, and the bottom plate supports the top light splitting assembly and the top output collimator assembly.
Further, the central axis of the input collimator is at an angle of 8-13.5 degrees to the base of the bottom glass, such that incident light enters the base of the bottom glass at an angle of incidence of 8-13.5 degrees.
Accordingly, the present invention also provides a free space multiplexing method of a hinge structure, which is implemented by using the free space multiplexing device of a hinge structure as described in any one of the above, the method comprising:
the incident light is input to the bottom light splitting assembly through the input collimator;
the double-bandpass filter membrane of the bottom light splitting assembly reflects the transmission path light with the specified wavelength through the turning prism to reach the top light splitting assembly; the light is reflected into the bottom light splitting component through the reflection path of the double-band-pass filter membrane;
the reflected path light is coupled to the bottom output collimator assembly after passing through the optical element in the bottom light splitting assembly and is output from the corresponding bottom output collimator;
and the transmission path light is coupled to the top layer output collimator assembly after passing through the optical element in the top layer light splitting assembly and is output from the corresponding top layer output collimator.
One of the above technical solutions has the following advantages or beneficial effects: the free space multi-path wavelength division multiplexing device provided by the invention is characterized in that a bottom light splitting component is arranged, light splitting is carried out on a double-bandpass filter membrane on the bottom light splitting component, light of four channels is divided into two paths of light paths through the double-bandpass filter membrane, transmitted light is reflected into a top light splitting component through a turning prism, and the light is split in the top light splitting component and is output through two top output collimators respectively; reflected light is split in the bottom light splitting assembly and is output through the two bottom output collimators; a free-space multi-path wavelength division multiplexer is formed by utilizing the reflection principle, and light of four channels is output through four output collimators.
Compared with the traditional serial wavelength division multiplexing device, the invention adopts a serial design idea, the number of the bandpass filters passing through the channel with the longest optical path is reduced, the insertion loss performance in the evaluation index of the device is improved, and the actual isolation is higher than that of the traditional serial wavelength division multiplexing device because the dual-bandpass filter membrane and the bandpass membrane pass through the related light splitting twice. The invention has simple structure, convenient installation, small occupied space and higher practicability.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description relate only to some embodiments of the present invention and are not limiting thereof, wherein:
FIG. 1 is a schematic diagram of a free space multiplexing device with a turning structure according to the present invention;
FIG. 2 is a schematic diagram of the optical path of the bottom layer structure in the free space multiplexing device with the turning structure according to the present invention;
FIG. 3 is a schematic diagram of the top layer structure optical path in the free space multiplexing device with the turning structure according to the present invention;
fig. 4 is a flow chart of the free space multiplexing method of the turning structure according to the present invention.
Reference numerals: 1. a substrate; 2. an input collimator; 31. a first bottom output collimator; 32. a second bottom output collimator; 4. a bottom glass base; 5. a base plate; 61. a first top-level output collimator; 62. a second top-level output collimator; 7. a top layer glass base; 8. a first bottom anti-reflection film; 9. a double bandpass filter membrane; 10. a bottom highly reflective film; 11. a bottom layer band-pass membrane; 12. a bottom layer of a second antireflection film; 13. a first top antireflection film; 14. a top highly reflective film; 15. a top layer band-pass membrane; 16. a second top antireflection film; 17. a turning prism; 100. a bottom light splitting assembly; 200. the top light splitting component.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
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.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc., are defined with respect to the configurations shown in the respective drawings, and in particular, "height" corresponds to a dimension from top to bottom, "width" corresponds to a dimension from left to right, "depth" corresponds to a dimension from front to rear, which are relative concepts, and thus may be varied accordingly depending on the position in which it is used, and thus these or other orientations should not be construed as limiting terms.
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.
Example 1
Referring to fig. 1 to 3, it can be seen that a free space multiplexing device with a folding structure includes an input collimator 2, a bottom output collimator assembly, a bottom beam splitter assembly 100, a folding prism 17, a top beam splitter assembly 200, and a top output collimator assembly; the bottom beam splitting assembly 100 includes a dual band-pass filter membrane 9.
The emitted light is input into the collimator 2 to the bottom light splitting assembly 100, and after being split by the double-band-pass filter membrane 9 on the bottom light splitting assembly 100, the reflected light is output from the bottom output collimator assembly in the bottom light splitting assembly 100; the transmission path light is emitted to the top beam splitting assembly 200 through the turning prism 17, and is output from the top output collimator assembly after passing through the top beam splitting assembly 200.
The invention also comprises a substrate 1, and the bottom light splitting assembly 100 and the bottom output collimator assembly are positioned on the substrate 1. The bottom light splitting assembly 100 further comprises a bottom glass base 4, a bottom band-pass diaphragm 11, a bottom first antireflection film 8, a double band-pass filter diaphragm 9, a bottom high-reflection film 10 and a bottom second antireflection film 12. A bottom layer band-pass membrane 11, a bottom layer first antireflection film 8, a double band-pass filter membrane 9, a bottom layer high-reflection film 10 and a bottom layer second antireflection film 12 are coated or attached on the bottom layer glass base 4.
The bottom output collimator assembly comprises a first bottom output collimator 31, a second bottom output collimator 32; the first bottom output collimator 31 and the second bottom output collimator 32 are arranged in parallel at an equal distance on one side of the bottom glass base 4.
The bottom layer first antireflection film 8 corresponds to the input collimator 2, and the bottom layer band-pass membrane 11 corresponds to the first bottom layer output collimator 31; the bottom layer second antireflection film 12 corresponds to the second bottom layer output collimator 32; the double bandpass filter membrane 9 corresponds to the turning prism 17; the correspondence is position correspondence.
The first antireflection film 8 at the bottom layer and the band-pass film 11 at the bottom layer are positioned at the same side of the glass base 4 at the bottom layer; the bottom high-reflection film 10 and the double bandpass filter membrane 9 are positioned on the same side of the bottom glass substrate 4.
Specifically, the double-bandpass filter membrane 9 and the bottom-layer bandpass membrane 11 are located on two side surfaces of the bottom-layer glass base 4; the double bandpass filter membrane 9 corresponds to the turning prism 17; after the incident light is split by the double-band-pass filter diaphragm 9, the reflected path light is split by the bottom-layer band-pass diaphragm 11 and then output by the bottom-layer output collimator assembly, and the transmitted path light is reflected to the top-layer light splitting assembly 200 by the turning prism 17.
The top beam splitting assembly 200 includes a top glass substrate 7, a top bandpass membrane 15, a top first antireflection film 13, a top high reflection film 14, and a top second antireflection film 16. A top layer band-pass membrane 15, a top layer first antireflection film 13, a top layer high reflection film 14 and a top layer second antireflection film 16 are coated or attached on the top layer glass base 7.
The top output collimator assembly comprises a first top output collimator 61, a second top output collimator 62; the first 61 and second 62 top output collimators are arranged in parallel and equidistant on one side of the top glass substrate 7.
Specifically, the top layer bandpass membrane 15 corresponds to the first top layer output collimator 61; the top second antireflection film 16 corresponds to the second top output collimator 62; the top first antireflection film 13 corresponds to the turning prism 17.
The top layer first antireflection film 13 and the top layer high reflection film 14 are located on the same side of the top layer glass base 7, and the top layer second antireflection film 16 and the top layer band-pass membrane 15 are located on the same side of the top layer glass base 7.
A bottom plate 5 is arranged between the bottom light splitting assembly 100 and the top light splitting assembly 200, and the top light splitting assembly 200 and the top output collimator assembly are supported by the bottom plate 5.
The central axis of the input collimator 2 is at an angle of 8-13.5 degrees to the bottom glass base 4, so that the incident light enters the bottom glass base 4 at an angle of incidence of 8-13.5 degrees. When the central axis of the input collimator 2 and the bottom glass base 4 form an angle of 8 degrees, the whole device is small in size and good in universality.
Referring to fig. 2, the input collimator 2 is configured to entirely form collimated signal lights λ 1, λ 2, λ 3, and λ 4 from incident lights of four channels, and the incident lights enter the bottom layer first antireflection film 8 on the bottom layer light splitting assembly at a specific angle of 8 degrees, and the bottom layer glass base 4 in the bottom layer light splitting assembly is prismatic, after the signal lights enter the bottom layer glass base 4 and are split by the dual bandpass filter diaphragm 9, the reflected signal lights of two channels λ 1 and λ 2 pass through the bottom layer bandpass diaphragm 11 on the bottom layer light splitting assembly, so that the collimated signal light λ 1 penetrates into the first bottom layer output collimator 31, and the collimated signal light λ 2 penetrates into the second bottom layer output collimator 32 through the bottom layer bandpass diaphragm 11 and the bottom layer high reflection film 10 and is reflected twice.
The signal light of two channels λ 3 and λ 4 transmitted by the corresponding dual bandpass filter membrane 9 enters the top layer light splitting assembly through the turning prism 17, and reaches the top layer bandpass membrane 15 through the top layer first antireflection film 13 on the bottom layer light splitting assembly, so that the collimated signal light λ 3 is transmitted to enter the first top layer output collimator 61, and the collimated signal light λ 4 enters the second top layer output collimator 62 through two reflections of the top layer bandpass membrane 15 and the top layer high reflection film 14.
The passband corresponding to the dual bandpass of the invention can be flexibly adjusted, and a plurality of different channel combinations can be used in practical use.
When the invention is installed and debugged, the invention provides a debugging method of a free space wavelength division multiplexing device, which comprises the following steps:
firstly, a first antireflection film 8 at the bottom layer, a second antireflection film 12 at the bottom layer, a high-reflection film 10 at the bottom layer, a band-pass diaphragm 11 at the bottom layer and a double-band-pass filter diaphragm 9 at the bottom layer are correspondingly attached to a glass base 4 at the bottom layer to manufacture a light splitting assembly at the bottom layer.
And secondly, attaching a first top antireflection film 13, a second top antireflection film 16, a high top antireflection film 14 and a top band-pass membrane 15 to the top glass substrate 7 to manufacture a top light splitting assembly.
Thirdly, a bottom light splitting component 100 is installed on the base 1, an input collimator 2 is placed at one section of the bottom light splitting component, and a bottom output collimator component is adjusted and coupled.
Fourth, a turning prism 17 is placed at the other end of the bottom light-splitting assembly 100.
Fifthly, placing a bottom plate 5 on the bottom light splitting assembly 100, and placing a top light splitting assembly 200 on the bottom plate 5;
sixthly, the top output collimator assembly is adjusted at the light-emitting position of the top light splitting assembly 200 to couple out light.
The free space multi-path wavelength division multiplexing device provided by the invention is characterized in that a bottom light splitting component is arranged, light splitting is carried out on a double-bandpass filter membrane on the bottom light splitting component, light of four channels is divided into two paths of light paths through the double-bandpass filter membrane, transmitted light is reflected into a top light splitting component through a turning prism, and the light is split in the top light splitting component and is output through two top output collimators respectively; reflected light is split in the bottom light splitting assembly and is output through the two bottom output collimators; a free-space multi-path wavelength division multiplexer is formed by utilizing the reflection principle, and light of four channels is output through four output collimators.
Compared with the traditional serial wavelength division multiplexing device, the invention has the advantages that the number of the bandpass filters passing through the channel with the longest optical path is reduced, namely, the input collimator can reach the output collimator, and the optical loss is reduced.
The insertion loss performance in the evaluation index of the device is improved, and the actual isolation is higher than that of the traditional serial wavelength division multiplexing device because the double-band-pass filter diaphragm and the band-pass diaphragm are subjected to two times of related light splitting. The invention has simple structure, convenient installation, small occupied space and higher practicability.
Example 2
Fig. 4 shows embodiment 2 of the present invention, and referring to fig. 2, it can be seen that a free space multiplexing method of a hinge structure is implemented by using a free space multiplexing device of a hinge structure as described in the first embodiment, and the method includes:
s100, inputting incident light to the bottom light splitting assembly 100 through the input collimator 2;
s200, reflecting the transmission path light with the specified wavelength by the double bandpass filter membrane 9 of the bottom light splitting assembly 100 through the turning prism 17 to reach the top light splitting assembly 200; the light is reflected into the bottom light splitting assembly 100 through the reflection path of the double-band pass filter membrane 9.
Specifically, the signal light is split by the double-bandpass filter membrane 9, two channels are transmitted, and two channels are reflected.
And S300, coupling the reflected path light to a bottom output collimator assembly through an optical element in the bottom light splitting assembly 100, and outputting the light from the corresponding bottom output collimator.
Specifically, the reflected light of the two channels is reflected to the bottom band-pass diaphragm 11 of the bottom light splitting assembly, so that the reflected light of one channel is transmitted to the first bottom output collimator 31, and the reflected light of one channel is reflected by the bottom high-reflection film 10 and then enters the second bottom output collimator 32.
And S400, coupling the transmission path light to a top output collimator assembly through the optical elements in the top light splitting assembly 200, and outputting the transmission path light from the corresponding top output collimator.
Specifically, the transmission light of the two channels is reflected to the top layer light splitting assembly through the turning prism 17, and reaches the top layer band-pass membrane 15 of the top layer light splitting assembly, so that one channel is transmitted, the transmission channel enters the first top layer output collimator 61, one channel is reflected, and the reflection light enters the second top layer output collimator 62 after passing through the top layer high-reflection membrane 14.
Specifically, referring to fig. 2, the input collimator 2 is configured to form collimated signal lights λ 1, λ 2, λ 3, and λ 4 from incident light of four channels entirely, the incident light enters the bottom layer first antireflection film 8 on the bottom layer light splitting assembly at a specific angle of 8 degrees, the bottom layer glass base 4 in the bottom layer light splitting assembly is prismatic, the signal light enters the bottom layer glass base 4, the signal light is split by the dual bandpass filter diaphragm 9, the reflected signal lights of two channels λ 1 and λ 2 pass through the bottom layer bandpass diaphragm 11 on the bottom layer light splitting assembly, so that the collimated signal light λ 1 penetrates into the first bottom layer output collimator 31, and the collimated signal light λ 2 enters the second bottom layer output collimator 32 after being reflected twice by the bottom layer bandpass diaphragm 11 and the bottom layer high reflection film 10.
The signal light of two channels λ 3 and λ 4 transmitted by the corresponding dual bandpass filter membrane 9 enters the top layer light splitting assembly through the turning prism 17, and reaches the top layer bandpass membrane 15 through the top layer first antireflection film 13 on the bottom layer light splitting assembly, so that the collimated signal light λ 3 is transmitted to enter the first top layer output collimator 61, and the collimated signal light λ 4 enters the second top layer output collimator 62 through two reflections of the top layer bandpass membrane 15 and the top layer high reflection film 14.
The free space multiplex wavelength division multiplexing method provided by the invention is characterized in that a bottom light splitting component is arranged, light splitting is carried out on a double-bandpass filter membrane on the bottom light splitting component, light of four channels is divided into two paths of light paths through the double-bandpass filter membrane, transmitted light is reflected into a top light splitting component through a turning prism, and the light is split in the top light splitting component and is output through two top output collimators respectively; reflected light is split in the bottom light splitting assembly and is output through the two bottom output collimators; a free-space multi-path wavelength division multiplexer is formed by utilizing the reflection principle, and light of four channels is output through four output collimators.
Compared with the traditional serial wavelength division multiplexing device, the invention has the advantages that the number of the bandpass filters passing through the channel with the longest optical path is reduced, namely, the input collimator can reach the output collimator, and the optical loss is reduced.
The insertion loss performance in the evaluation index of the device is improved, and the actual isolation is higher than that of the traditional serial wavelength division multiplexing device because the double-band-pass filter diaphragm and the band-pass diaphragm are subjected to two times of related light splitting. The invention has simple structure, convenient installation, small occupied space and higher practicability.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
The features of the different implementations described herein may be combined to form other embodiments not specifically set forth above. The components may be omitted from the structures described herein without adversely affecting their operation. Further, various individual components may be combined into one or more individual components to perform the functions described herein.
Furthermore, while embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in a variety of fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A free space multiplex wavelength division multiplexing device with a turning structure is characterized by comprising an input collimator (2), a bottom output collimator component, a bottom light splitting component (100), a turning prism (17), a top light splitting component (200) and a top output collimator component; the bottom light splitting component (100) comprises a double-band-pass filter membrane (9);
the emitted light is transmitted to the bottom light splitting assembly (100) through the input collimator (2), and after being split by the double-bandpass filter membrane (9) on the bottom light splitting assembly (100), the reflected light is output from the bottom output collimator assembly in the bottom light splitting assembly (100); the transmission path light is emitted to the top layer light splitting assembly (200) through the turning prism (17), and is output from the top layer output collimator assembly after passing through the top layer light splitting assembly (200).
2. A turning structure free-space multiplexing device in accordance with claim 1, wherein the bottom light splitting assembly (100) further comprises a bottom glass base (4); the bottom output collimator assembly comprises a first bottom output collimator (31) and a second bottom output collimator (32); the first bottom output collimator (31) and the second bottom output collimator (32) are arranged in parallel at equal distance on one side of the bottom glass base (4).
3. A turning structure free-space multiplexing device according to claim 2, wherein the bottom beam splitting module (100) further comprises a bottom bandpass membrane (11); the bottom layer band-pass membrane (11) corresponds to the first bottom layer output collimator (31);
the double-bandpass filter membrane (9) and the bottom-layer bandpass membrane (11) are positioned on two side surfaces of the bottom-layer glass base (4); the double-bandpass filter membrane (9) corresponds to the turning prism (17); incident light is split by the double band-pass filter diaphragm (9), and reflected path light is split by the bottom layer band-pass diaphragm (11) and then is output by the bottom layer output collimator assembly.
4. A free space multiplexing device with a hinge structure as claimed in claim 3, wherein the bottom beam splitting assembly (100) further comprises a bottom first antireflection film (8), a bottom high reflection film (10), and a bottom second antireflection film (12); the first antireflection film (8) is opposite to the input collimator (2), and the first antireflection film (8) and the bottom layer band-pass membrane (11) are positioned on the same side of the bottom layer glass base (4); the bottom high-reflection film (10) and the double-band-pass filter membrane (9) are positioned on the same side of the bottom glass base (4); the bottom layer second antireflection film (12) corresponds to the second bottom layer output collimator (32).
5. A free-space multiplexing device of hinge structure as claimed in claim 1, wherein the top beam splitting element (200) comprises a top glass base (7);
the top-level output collimator assembly comprises a first top-level output collimator (61), a second top-level output collimator (62); the first top layer output collimator (61) and the second top layer output collimator (62) are arranged in parallel at equal distance on one side of the top layer glass base (7).
6. A free-space multiplexing device of hinge structure as claimed in claim 5, wherein the top beam splitting module (200) further comprises a top bandpass membrane (15); the top layer bandpass membrane (15) corresponds to the first top layer output collimator (61).
7. A free space multiplexing device having a hinge structure as described in claim 6, further comprising a top first antireflection film (13), a top highly reflective film (14), and a top second antireflection film (16);
the top layer first antireflection film (13) and the top layer high-reflection film (14) are located on the same side of the top layer glass base (7), the top layer second antireflection film (16) and the top layer band-pass membrane (15) are located on the same side of the top layer glass base (7), and the top layer second antireflection film (16) corresponds to the second top layer output collimator (62).
8. A free-space multiplexing device with a turning structure according to claim 1, wherein a bottom plate (5) is disposed between the bottom beam splitter (100) and the top beam splitter (200), and the bottom plate (5) supports the top beam splitter (200) and the top output collimator.
9. A turning structure free space multiplexing device as claimed in claim 2, wherein the central axis of the input collimator (2) is at an angle of 8-13.5 degrees to the underlying glass substrate (4) such that the incident light enters the underlying glass substrate (4) at an angle of incidence of 8-13.5 degrees.
10. A free space multiplexing method of a hinge structure, which is implemented using the free space multiplexing device of a hinge structure according to any one of claims 1 to 9, the method comprising:
the incident light is input to the bottom light splitting assembly (100) through the input collimator (2);
the double-bandpass filter membrane (9) of the bottom light splitting assembly (100) reflects the transmission path light with the specified wavelength through the turning prism (17) to reach the top light splitting assembly (200); the light is reflected into the bottom light splitting component (100) through the reflection path of the double-band-pass filter membrane (9);
the reflected path light is coupled to a bottom output collimator assembly after passing through an optical element in the bottom light splitting assembly (100) and is output from a corresponding bottom output collimator;
the transmission path light is coupled to the top layer output collimator assembly after passing through the optical elements in the top layer light splitting assembly (200) and is output from the corresponding top layer output collimator.
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