CN207198376U - A kind of new optical waveguide filter - Google Patents
A kind of new optical waveguide filter Download PDFInfo
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- CN207198376U CN207198376U CN201721042410.8U CN201721042410U CN207198376U CN 207198376 U CN207198376 U CN 207198376U CN 201721042410 U CN201721042410 U CN 201721042410U CN 207198376 U CN207198376 U CN 207198376U
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- Prior art keywords
- liquid crystal
- optical waveguide
- layer
- quartz substrate
- crystal molecule
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- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 68
- 239000010410 layer Substances 0.000 claims abstract description 65
- 239000010453 quartz Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 25
- WSFMFXQNYPNYGG-UHFFFAOYSA-M dimethyl-octadecyl-(3-trimethoxysilylpropyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CCC[Si](OC)(OC)OC WSFMFXQNYPNYGG-UHFFFAOYSA-M 0.000 claims abstract description 19
- 210000002858 crystal cell Anatomy 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000012792 core layer Substances 0.000 claims abstract description 8
- 230000008021 deposition Effects 0.000 claims abstract description 7
- 239000004990 Smectic liquid crystal Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 33
- 238000004891 communication Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000004988 Nematic liquid crystal Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical group [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- Optical Integrated Circuits (AREA)
Abstract
The utility model discloses a kind of new optical waveguide filter,The optical waveguide filter includes cylindrical quartz substrate package and hot sealing layer,The cylindrical quartz substrate package and hot sealing layer form liquid crystal cell,Liquid crystal molecule is distributed with the liquid crystal cell,Outer layer ITO layer has been deposited in the outer surface of the cylindrical quartz substrate,Deposition has DMOAP monolayers on the inner surface of the cylindrical quartz substrate,The liquid crystal molecule is arranged by the orientation of DMOAP monolayers perpendicular to cylindrical quartz substrate package,The refractive index of the liquid crystal molecule short axle is less than the refractive index of optical waveguide core layer,The refractive index of long axis of liquid crystal molecule is higher than the refractive index of optical waveguide core layer,The liquid crystal cell is integrally placed in electromagnetic field,The orientation of the electromagnetic field adjustable liquid crystal display molecule,So as to change the refringence between fiber waveguide and liquid crystal molecule,Suppress multimode output,Realize single-mode output.The utility model structural type is simple and practical, has corresponding application prospect in optical waveguide communication industry.
Description
Technical field
The utility model belongs to optical communication field, and in particular to a kind of new optical waveguide filter.
Background technology
With the rapid development of mankind's science and technology, optical communication field also flourishes.No matter photon in transmission speed or is believed
All far win electronics in terms of ceasing carrying amount, various optical devices arise at the historic moment.Optical fiber is with its high power capacity, high transfer rate and low bit error
Rate, turn into the mainstream carrier of modern society's information transfer.Particularly multimode fibre, letter big relative to single-mode fiber transmission capacity
Breath loading capacity is more, and use is quite varied.However, it is necessary to which the higher order mode in multimode fibre is gone in specific optical system
Remove, or even only need single-mode output to adapt to the demand of subsequent optical system, it is necessary to use optical filter.Optical filter
General principle to increase the loss of higher order mode, adoptable mode is varied, such as by reasonably designing height
Rank pattern is unsatisfactory for total reflection condition, or the transmission loss of increase higher order mode.
The refringence changed between sandwich layer and covering is more common filtering principle, with the reduction of refringence,
Higher order mode will be unsatisfactory for total reflection condition, and so as to be dissipated by covering, refringence is smaller, and open ended pattern count is fewer,
Finally realize single-mode output.Regulation for refringence, realized generally by the refractive index for changing covering, however, nothing
By being to utilize electrooptic effect or fuel factor, absolute value that refringence changes is general all in 0.01 magnitude, what it was adjusted
Dynamic range is little.
The content of the invention
For problems of the prior art, the utility model provides a kind of new optical waveguide filter, Neng Gou great
Increase and add refringence adjustable extent between mode fiber sandwich layer and covering, can be with by adjusting the intensity of additional electromagnetic field
Realize multimode filtering and single-mode output.
To achieve the above object, the utility model uses following technical scheme：
A kind of new optical waveguide filter, the optical waveguide filter include cylindrical quartz substrate package and hot sealing layer,
The cylindrical quartz substrate package and hot sealing layer form liquid crystal cell, liquid crystal molecule are distributed with the liquid crystal cell, in the circle
The outer surface of cylindricality quartz base plate has deposited outer layer ITO layer, there is deposition on the inner surface of the cylindrical quartz substrate
DMOAP monolayers, the liquid crystal molecule is by the orientation of DMOAP monolayers perpendicular to cylindrical quartz substrate package
Arrangement, the refractive index of the liquid crystal molecule short axle are higher than less than refractive index, the refractive index of long axis of liquid crystal molecule of optical waveguide core layer
The refractive index of optical waveguide core layer, the liquid crystal cell are integrally placed in electromagnetic field, the arrangement side of the electromagnetic field adjustable liquid crystal display molecule
To so as to change the refringence between fiber waveguide and liquid crystal molecule, suppressing multimode output, realize single-mode output.
Deposition has internal layer ITO layer on the inner surface of the cylindrical quartz substrate, and the DMOAP monolayers are sunk
Product is advantageous to increase the uniformity of DMOAP monolayers distribution in internal layer ITO layer.
The liquid crystal molecule is nematic phase or smectic phase.
The electromagnetic field is by electrode or magnetic pole offer.
The outer layer ITO layer, the thickness of internal layer ITO layer are micron dimension.
The preparation method of the DMOAP monolayers is：60%wt DMAOP methanol solutions are taken 5 milliliters, then dissolved
Into 100 ml deionized waters, soak is formed, cylindrical quartz substrate package is submerged into half an hour in soak, obtained
DMOAP monolayers.
A kind of application of new optical waveguide filter in multimode fibre filtering, after multimode fibre is passed through liquid crystal cell, is used
Hot sealing layer sealing is fixed, and multimode fibre carries out isotropic etch by 5%wt hydrofluoric acid solution, removes covering, multimode fibre
The length for removing covering is less than the length of cylindrical quartz substrate package, enables the part inside cylindrical quartz substrate package
The change of ambient refractive index is experienced, so as to change the refringence between multimode fibre sandwich layer and liquid crystal molecule, when outer power-up
When on liquid crystal molecule, not parallel liquid crystal molecule can rotate magnetic fields with electromagnetism field direction, the multimode fibre core
The refractive index for the liquid crystal molecule that layer is experienced is gradually from short axle excessively to major axis, by changing the size of additional electromagnetic field, liquid crystal
The overall alignment of molecule is continuously adjusted, until the refractive index of liquid crystal molecule is more than or equal to the refractive index of multimode fibre sandwich layer,
Suppress multimode output, realize single-mode output.
Compared with prior art, the beneficial effects of the utility model are：
1. the utility model acts on liquid crystal molecule " covering " of multimode fibre, the refringence experienced in multimode fibre
As core refractive rate（nc）It is the filter that multimode fibre is realized by regulating and controlling Liquid Crystal Molecules Alignment with the refringence of liquid crystal molecule
Ripple and single-mode output, and for liquid crystal molecule, due to rod-like morphology, two refractive indexes be present, noAnd ne, long axis direction folding
Penetrate rate neWith short-axis direction refractive index noUp to 0.2 can be differed between the two, can the filtering of very effective implementation pattern, and
And the dynamic range of filtering is very big, has fabulous application potential and prospect in photoswitch and optical communication field；2. this practicality is new
Type single unit system is simple and clear, compact-sized, is easy to make；Pass through the orientation of additional electromagnetic field adjustable liquid crystal display molecule, control
The refringence of multimode fibre sandwich layer and covering processed, regulation dynamic range are big.
Brief description of the drawings
Fig. 1 is the integrally-built vertical section schematic diagram of the utility model.
Fig. 2 is structural representation when the utility model is applied to multimode fibre.
Fig. 3 is Fig. 2 A-A views.
Fig. 4 is the utility model fiber waveguide filtering principle schematic diagram.
Wherein：1- multimode fibres；2- quartz base plate shells；3- hot sealing layers；4- liquid crystal molecules；5- outer layer ITO layers；
6-DMOAP monolayers；7- electromagnetic fields, 8- internal layer ITO layers.
Embodiment
The utility model is described further with reference to embodiment and accompanying drawing, but the utility model should not be limited with this
Protection domain.
As depicted in figs. 1 and 2, the new optical waveguide filter of the present embodiment, the optical waveguide filter include cylindrical stone
English substrate package 2 and hot sealing layer 3, the cylindrical quartz substrate package 2 and hot sealing layer 3 form liquid crystal cell, in the liquid crystal cell
Liquid crystal molecule 4 is distributed with, outer layer ITO layer 5, the cylindrical stone have been deposited in the outer surface of the cylindrical quartz substrate 2
Deposition has DMOAP monolayers 6, the orientation that the liquid crystal molecule 4 passes through DMOAP monolayers 6 on the inner surface of English substrate 2
Effect arranges perpendicular to cylindrical quartz substrate package 2, and the refractive index of the liquid crystal molecule short axle is less than the folding of optical waveguide core layer
Penetrate rate, the refractive index of long axis of liquid crystal molecule is higher than the refractive index of optical waveguide core layer, the liquid crystal cell is integrally placed in electromagnetic field 7,
The orientation of the adjustable liquid crystal display molecule 4 of electromagnetic field 7, so as to change the refringence between fiber waveguide and liquid crystal molecule, suppression
Multimode output processed, realizes single-mode output.
Preferably, deposition has internal layer ITO layer 8, institute to the present embodiment on the inner surface of the cylindrical quartz substrate 2
DMOAP monolayers 6 are stated to be deposited in internal layer ITO layer 8.
Liquid crystal molecule 4 is nematic phase or smectic phase in the present embodiment.
As further preferred, the present embodiment electromagnetic field is by electrode or magnetic pole offer.
As still more preferably, the present embodiment outer layer ITO layer 5, the thickness of internal layer ITO layer 8 are micron dimension.
The preparation method of DMOAP monolayers 6 is in the present embodiment：60%wt DMAOP methanol solutions are taken 5 milliliters, so
After be dissolved into 100 ml deionized waters, form soak, it is small that cylindrical quartz substrate package 2 submerged in soak to half
When, obtain DMOAP monolayers 6.
As shown in figure 3, application of the new optical waveguide filter of the present embodiment in multimode fibre filtering, multimode fibre 1
After being passed through liquid crystal cell, being sealed and fixed with hot sealing layer 3, multimode fibre 1 carries out isotropic etch by 5%wt hydrofluoric acid solution,
Covering is removed, multimode fibre 1 removes length of the length less than cylindrical quartz substrate package 2 of covering, makes cylindrical quartz base
The part of the inside of plate shell 2 can experience the change of ambient refractive index, so as to change multimode fibre sandwich layer and liquid crystal molecule it
Between refringence, when additional electromagnetic field is acted on liquid crystal molecule, not parallel liquid crystal molecule can be sent out with electromagnetism field direction
Raw rotation, the refractive index for the liquid crystal molecule that the multimode fibre sandwich layer is experienced pass through change gradually from short axle excessively to major axis
The size of additional electromagnetic field, the overall alignment of liquid crystal molecule are continuously adjusted, until the refractive index of liquid crystal molecule is more than or equal to
The refractive index of multimode fibre sandwich layer, suppress multimode 9 and export, realize that single mode 10 exports.
The pattern count for determining to transmit in a fiber waveguide factor how much is the refringence between sandwich layer and covering, works as core
When refringence between layer and covering is larger, there may be more pattern count and propagated in sandwich layer；With sandwich layer and covering it
Between refringence when reducing, pattern count also accordingly reduces, until realize single-mode output.
In embodiment：Described multimode fibre is 220 microns of sandwich layer diameter, the Commercial fibers of refractive index 1.54, described
Cylindrical quartz substrate be the common commercial product of in the market, described hot sealing layer is heat-curable glue, can be by organic molten
Liquid is wiped, and described ito thin film is indium tin oxide film, and described DMOAP is commercial product（CAS：27668-
52-6）；Described liquid crystal is nematic liquid crystal, and liquid crystal molecule is in contact by DMOAP grapplings effect and ito thin film, and is led to
Crossing the grappling and acting on causes liquid crystal molecule overall perpendicular to ito thin film surface alignment, i.e. overall radial arrangement.
In the present embodiment, when no additional electromagnetic field, liquid crystal molecule initial arrangement is arranged radially, and fiber waveguide is experienced
" liquid crystal molecule covering " refractive index be no（Short axle refractive index）, compared to nc（Core refractive rate）Can be small by 0.1, realize multimode output；
When additional electromagnetic field is acted on liquid crystal molecule, not parallel liquid crystal molecule can rotate with electric field or magnetic direction,
So that the refractive index increase of " liquid crystal covering ", so as to reduce the refringence between sandwich layer and covering, pattern count gradually decreases,
The crystal molecule refractive index that now sandwich layer is experienced is gradually from short axle excessively to major axis, by changing the size of additional electromagnetic field,
The overall alignment of liquid crystal molecule can be continuously adjusted, when additional electromagnetic field is sufficiently large（For example, for a diameter of 500
The cylindrical quartz substrate package of micron, the voltage can that need to only provide several volts allow liquid crystal molecule that obvious rotate occurs）.It is right
For pattern in multimode fibre, its liquid crystal molecule cladding index experienced is from no（Short-axis direction refractive index）It is changed into ne
（Long axis direction refractive index）.By taking the refractive index of nematic liquid crystal molecule as an example, no=1.42, ne=1.62, during initial arrangement, refraction
Rate difference is nc- no=0.12, there may be multiple patterns in optical fiber, cut-off frequency is very high；And in sufficiently large electromagnetic field（With electricity
Exemplified by, it is only necessary to several volts）Under the conditions of, ne＞ nc, all patterns can not all carry out total reflection propagation in optical fiber, thus only
The intensity by reasonably adjusting additional electromagnetic field is needed, can be by nc- noIt is gradually reduced, when cut-off frequency meets single mode propagation
During condition（V=2.405）Can realizes single-mode output.Because the refringence between liquid crystal major axis and short axle can reach
0.2, the refractive index of " liquid crystal covering " can be caused to exceed the refractive index of sandwich layer under sufficiently large electromagnetic field effect completely, also
Illustrate that certainly existing suitable electromagnetic field intensity makes fiber waveguide realize single-mode output.For in principle, because additional electromagnetic field
Intensity it is controllable very accurate, nc- noNumerical value can also control it is very accurate, it might even be possible to realize small in optical fiber
In any exponent number m（M should be not more than in largest refractive index difference nc- noUnder the conditions of allow in optical fiber existing for the pattern exponent number upper limit）'s
Pattern is propagated, pattern of the filtering more than any exponent number m, so as to realize accurately mode tuning.
Although above-described embodiment makes specific descriptions to the utility model, for one of ordinary skill in the art
For, it is understood that can not depart within spirit and scope of the present utility model be based on the utility model disclosed in
Appearance is modified or improved, and these modification and improvement are all within spirit and scope of the present utility model.
Claims (5)
1. a kind of new optical waveguide filter, it is characterised in that the optical waveguide filter includes cylindrical quartz substrate package
（2）And hot sealing layer（3）, the cylindrical quartz substrate package（2）And hot sealing layer（3）Liquid crystal cell is formed, is divided in the liquid crystal cell
It is furnished with liquid crystal molecule（4）, in the cylindrical quartz substrate package（2）Outer surface deposited outer layer ITO layer（5）, it is described
Cylindrical quartz substrate package（2）Inner surface on deposition have DMOAP monolayers（6）, the folding of the liquid crystal molecule short axle
Penetrate the refractive index that rate is higher than optical waveguide core layer less than refractive index, the refractive index of long axis of liquid crystal molecule of optical waveguide core layer, the liquid
Brilliant box is integrally placed at electromagnetic field（7）In.
2. new optical waveguide filter according to claim 1, is characterised by, in the cylindrical quartz substrate package
（2）Inner surface on deposition have internal layer ITO layer（8）, the DMOAP monolayers（6）It is deposited on internal layer ITO layer（8）On.
3. new optical waveguide filter according to claim 1, it is characterised in that the liquid crystal molecule（4）For nematic
Phase or smectic phase.
4. new optical waveguide filter according to claim 1, it is characterised in that the electromagnetic field be by electrode or
Magnetic pole provides.
5. new optical waveguide filter according to claim 2, it is characterised in that the outer layer ITO layer（5）, internal layer
ITO layer（8）Thickness be micron dimension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721042410.8U CN207198376U (en) | 2017-08-21 | 2017-08-21 | A kind of new optical waveguide filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721042410.8U CN207198376U (en) | 2017-08-21 | 2017-08-21 | A kind of new optical waveguide filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207198376U true CN207198376U (en) | 2018-04-06 |
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| CN201721042410.8U Expired - Fee Related CN207198376U (en) | 2017-08-21 | 2017-08-21 | A kind of new optical waveguide filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390318A (en) * | 2017-08-21 | 2017-11-24 | 中国工程物理研究院上海激光等离子体研究所 | A kind of new optical waveguide filter and its application |
-
2017
- 2017-08-21 CN CN201721042410.8U patent/CN207198376U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390318A (en) * | 2017-08-21 | 2017-11-24 | 中国工程物理研究院上海激光等离子体研究所 | A kind of new optical waveguide filter and its application |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180406 |