CN108873180A - A kind of free space multichannel wavelength division multiplexer - Google Patents
A kind of free space multichannel wavelength division multiplexer Download PDFInfo
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- CN108873180A CN108873180A CN201810811104.9A CN201810811104A CN108873180A CN 108873180 A CN108873180 A CN 108873180A CN 201810811104 A CN201810811104 A CN 201810811104A CN 108873180 A CN108873180 A CN 108873180A
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- wavelength
- prism
- division multiplex
- angle
- free space
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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
- G02B6/29379—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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The present invention discloses a kind of free space multichannel wavelength division multiplexer, including multiple wavelength-division multiplex filter plates, multiple collimators and multiple prisms；One wavelength-division multiplex functional unit is formed by the collimator, the filter plate and the prism；Multiple wavelength-division multiplex functional units form multichannel wavelength division multiplexer.It is characterized in that the wavelength-division multiplex filter plate incidence angle is smaller, incident angle is amplified by stating prism, such filter plate coating technique is easier to realize, cost is relatively low.
Description
【Technical field】
The present invention relates to fiber optic communication field passive device, especially a kind of free space, the intensive wave of compact multiport
Division multiplexer.
【Background technique】
In wavelength division multiplexing communications, the wavelength division multiplexer of multichannel multiport may be implemented after cascading by three port devices
Part, the light insertion loss of three port devices mostly come from the loss of collimator coupling, because being cascade, quite there is multipair collimation
The superposition of device coupling loss, causes very big loss, it is contemplated that the coiling of optical fiber cannot achieve compact wavelength division multiplex device.For
Reduction light insertion loss using free space type structure as shown in Figure 1 realizes multistage filter with the filter plate of large angle incidence
The direct cascade of wave plate avoids the multiple coupling of free space to optical fiber, forms compact wavelength division multiplex device
In Fig. 1, after signal light is collimated by collimator 111, multipass filter plate 120 divides the signal of different wave length
From.The signal separated needs to receive by the collimator 130 of arrangement.Discrete collimator 130 individually adjusts arrangement.But it connects
The arrangement for receiving device needs certain space.Signal is turned back between filter plate, the lateral displacement of generation and is incident on filter plate
On angle and signal transmission distance dependent.For the filter plate of coarse wavelength division multiplexing, designing incident angle can be 13.5 °,
The wide-angles such as 10 ° or 8 °, angle is bigger, and the volume of corresponding device is with regard to smaller.Incident angle is bigger, and the difficulty of plated film is also corresponding
It improves, cost is also increase accordingly.For dense wave division multiplexer, wave plate incident angle will be designed to that wide-angle is theoretically can
Can, but since passband is narrow, wavelength accuracy requirement is very high, and practical plated film is extremely difficult.
And be the filter plate of low-angle with incident angle, it is very long to separate light path required for two adjacency channels, turns back more
Signal gradually dissipates after secondary, and Insertion Loss becomes larger；Space length is also larger, realizes the intensive of high port using the technology to limit
Type wavelength division multiplexer.Such as publication number CN150700081A Chinese patent, in order to realize free space type dense wavelength division multiplexing device,
A small number of channel free space type dense wavelength division multiplexing devices are first made with the filter plate that incident angle is low-angle, then are relayed with one
Lens connect two a small number of channels free space type dense wavelength division multiplexing devices and multichannel dense wavelength division multiplexing device are made.It is practical
Upper relay lens is exactly to increase one group of collimator coupling, and coupling loss is still larger, and is low-angle with incident angle
Filter plate separates two adjacency channels and appoints right needs very long spacing, size relatively also larger.Secondly such as publication number
CN105938222A makees multichannel free space type dense wavelength division multiplexing device with the filter plate that incident angle is low-angle, real
On border, it is still very long to separate light path required for two adjacency channels, and only light path is folded to below substrate and is carried out.Collimator
The operating distance of overlength needs collimator hot spot very big, and the stressed zone that dense wavelength division multiplexing device filter plate plated film is stable
Smaller, hot spot is greater than the stable stressed zone of filter plate plated film, and loss can suddenly rise, and bandwidth can narrow rapidly.For another example publication number
CN106226868A, it needs the incidence angle of each channel filtering piece very consistent, and this manufacturability is very low.
Free space type wavelength division multiplexer is made using the lesser optical filter of incident angle, low-angle is needed to filter
Spatially incident angle increases.
【Summary of the invention】
The wavelength-division of free space type multichannel is made using the lesser optical filter of incident angle it is an object of the present invention to provide a kind of
Multiplexer.
To achieve the goals above, a kind of free space multichannel wavelength division multiplexer of the invention, it is characterised in that：Including
Multiple wavelength-division multiplex filter plates, multiple collimators and multiple prisms；The collimator, the filter plate and prism composition one
A wavelength-division multiplex functional unit；Multichannel wavelength division multiplexer is formed by multiple wavelength-division multiplex functional units.
Two light pass surfaces of the prism are nonparallel plane, and shape is angle of wedge piece prism, triangular prism or other shapes
The prism of shape.
The wavelength-division multiplex filter plate is incidence angle less than the low-angle wavelength-division multiplex filter plate in 7 degree.
In the wavelength-division multiplex functional unit, the filter plate is placed between the prism and the collimator.
Further, a kind of free space multichannel wavelength division multiplexer, it is characterised in that：Including wavelength-division multiplex filter plate, standard
Straight device；Collimator and filter plate form a wavelength-division multiplex functional unit；Multichannel is formed by multiple wavelength-division multiplex functional units
Wavelength division multiplexer.
Further, the wavelength-division multiplex filter plate is processed into the angle of wedge piece prism or triangular prism of wide-angle.
Using the above scheme, the optical filter of corresponding small incident angle is spatially become large angle incidence by prism.Very
Compact wavelength division multiplex device is realized in positive meaning.Present invention tool has the advantage that：
1. reducing plated film difficulty using the optical filter of small incident angle, the production of multichannel dense wave division multipurpose is really realized.
2. structure is simple, debugging packaging technology is easy, high reliablity.
3. space wide-angle, collimator light path is shorter, and entire device volume is smaller.
【Detailed description of the invention】
Fig. 1 is the free-space wavelength division multiplexing device structural schematic diagram of wide-angle optical filter production；
Fig. 2 is prism low-angle optical filter spatially incident angle increase schematic diagram；
Fig. 3 is that low-angle optical filter of the invention makes the implementation structural schematic diagram of free-space wavelength division multiplexing device first；
Fig. 4 is that low-angle optical filter of the invention makes the implementation structural schematic diagram of free-space wavelength division multiplexing device second；
【Specific embodiment】
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.Fig. 2 is rib
Low-angle optical filter, spatially incident angle increases schematic diagram to mirror, and angle α is the angle of optical filter 22 incident light and reflected light,
Angle θ is the angle of 22 incident light of optical filter and reflected light after prism 21.We are with simple geometric optics knowledge
Calculate angle θ and angle α relationship.As long as two light pass surfaces of prism 21 have angle, angle θ>α.That is, prism 21 is external empty
Between can amplify 22 incidence angle of optical filter.The multiple of amplification is associated with the refractive index of prism 21, the angle of wedge.
The present invention can be in the principle of exterior space amplification optical filter incidence angle, with small incidence angle using the prism with the angle of wedge
The optical filter of degree makes free-space wavelength division multiplexing device, if Fig. 3 is that low-angle optical filter of the invention makes free space wavelength-division
Multiplexer first implements structural schematic diagram.Optical fiber collimator 321, optical filter 331 and prism 341 constitute first wavelength-division multiplex list
Member；Its production method is that optical fiber collimator 321 and optical filter 331 are first adjusted, and optical filter 331 is made to export correct wavelength,
Meet ITU standard, and optical filter 331 and optical fiber collimator 321 are adhesively fixed, then prism 341 is stacked in 331 light passing of optical filter
It on face, is adhesively fixed, such a wavelength-division multiplex unit is just completed.Different filter sets is at different wavelength-division multiplex units.
In Fig. 3, the optical signal that input collimator 310 exports enters first wavelength-division multiplex unit with biggish incidence angle, and light reaches filter
When mating plate 331, with low-angle incidence, by the wavelength signals light to be exported, other signal lights are reflected, through prism 341, instead
It penetrates light to separate with larger angle, and injects next wavelength-division multiplex unit.By multiple wavelength-division multiplex units, free space is realized
Multichannel wavelength division multiplexer.
Fig. 4 is that low-angle optical filter makes the implementation structural schematic diagram of free-space wavelength division multiplexing device second.Optical fiber collimator
420 and optical filter 430 constitute first wavelength-division multiplex unit, in this embodiment, low-angle optical filter 430 is ground a wedge
Angle, then anti-reflection film is plated, or in angle of wedge on piece, wavelength-division multiplex film layer is plated on one side, and antireflective coating is plated in another side；Wavelength-division multiplex film layer is leaned on
To collimator 420.The optical filter 430 and collimator 420 of wedge shape are first adjusted, and export wedge-shaped optical filter 430 just from collimator 420
True wavelength meets ITU standard, and optical filter 430 and optical fiber collimator 420 is adhesively fixed, and constitutes a wavelength-division multiplex list
Member.
Input collimator 410 export optical signal with biggish incidence angle enter first wavelength-division multiplex unit, first
The collimator 430 of wavelength-division multiplex unit exports first wave length signal, other signals are simultaneously arrived with wide-angle reflection into second wave
Divide Multiplexing Unit, by multiple wavelength-division multiplex units, realizes free space multichannel wavelength division multiplexer.
The upper embodiment only expresses several exemplary embodiments of the invention, is not all.Such as put angle
Multiple angle of wedge piece composition wavelength-division multiplex units can be used in bigger multiple, and it is all scope that these, which slightly increase and change,.
Claims (7)
1. a kind of free space multichannel wavelength division multiplexer, it is characterised in that：Including multiple wavelength-division multiplex filter plates, multiple collimations
Device and multiple prisms；The collimator, the filter plate and the prism form a wavelength-division multiplex functional unit；By multiple institutes
State wavelength-division multiplex functional unit composition multichannel wavelength division multiplexer.
2. a kind of free space multichannel wavelength division multiplexer according to claim 1, it is characterised in that the two of the prism are logical
Smooth surface is nonparallel plane.
3. a kind of free space multichannel wavelength division multiplexer according to claim 2, it is characterised in that the prism is wedge
Cornual plate prism, triangular prism, cylindrical type prism or other shapes prism.
4. a kind of free space multichannel wavelength division multiplexer according to claim 1, it is characterised in that the wavelength-division multiplex filter
Wave plate is incidence angle less than the low-angle wavelength-division multiplex filter plate in 7 degree.
5. a kind of free space multichannel wavelength division multiplexer according to claim 1, it is characterised in that the wavelength-division multiplex function
In energy unit, the filter plate is placed between the prism and the collimator.
6. a kind of free space multichannel wavelength division multiplexer, it is characterised in that：Including wavelength-division multiplex filter plate, collimator；Collimation
Device and filter plate form a wavelength-division multiplex functional unit；Multichannel wavelength division multiplexing is formed by multiple wavelength-division multiplex functional units
Device.
7. a kind of free space multichannel wavelength division multiplexer according to claim 6, it is characterised in that the wavelength-division multiplex filter
Wave plate is processed into the angle of wedge piece prism or triangular prism of wide-angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810811104.9A CN108873180A (en) | 2018-07-23 | 2018-07-23 | A kind of free space multichannel wavelength division multiplexer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810811104.9A CN108873180A (en) | 2018-07-23 | 2018-07-23 | A kind of free space multichannel wavelength division multiplexer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646892A (en) * | 2019-09-29 | 2020-01-03 | 青岛光盈光电技术有限责任公司 | Compact dense wavelength division multiplexer for optical fiber communication transmission system |
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2018
- 2018-07-23 CN CN201810811104.9A patent/CN108873180A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646892A (en) * | 2019-09-29 | 2020-01-03 | 青岛光盈光电技术有限责任公司 | Compact dense wavelength division multiplexer for optical fiber communication transmission system |
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Application publication date: 20181123 |