CN1320400C - Digital optical switch in low cross talk - Google Patents
Digital optical switch in low cross talk Download PDFInfo
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- CN1320400C CN1320400C CNB2003101084082A CN200310108408A CN1320400C CN 1320400 C CN1320400 C CN 1320400C CN B2003101084082 A CNB2003101084082 A CN B2003101084082A CN 200310108408 A CN200310108408 A CN 200310108408A CN 1320400 C CN1320400 C CN 1320400C
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Abstract
The present invention discloses a digital optical switch in low crosstalk, which is formed by that a Y forking waveguide digital optical switch and an S-shaped bending waveguide type variable optical attenuator which is respectively connected to both ends of the Y forking waveguide digital optical switch are in integration. By using the effects of the negative refractive index of materials, the switching characteristics of the optical switch can be greatly improved under the condition that the length of components and the complex construction are not increased. The Y forking angles can be enlarged, simultaneously the structural correction is carried out on the Y forking area, which reduces technology difficulty, and simulation analysis is based on a BPM method (beam transmitting method). The digital optical switch of the present invention has the advantages of low crosstalk, small insertion loss, small polarization correlativity, good spectrum flatness, easy integration, etc.
Description
Technical field
The present invention relates to a kind of optical component, particularly relate to a kind of low digital optical switch of crosstalking.
Background technology
Along with the develop rapidly of Fibre Optical Communication Technology and dense wave division multipurpose (DWDM) system, digital optical switch (DOS) has obtained application more and more widely as important fiber waveguide device.Common photoswitch has Mach one to increase Dare (Mach-Zehnder) interferometer type, directional coupler type, X junction type, Y branch type etc., wherein more people's concern of Y branch type digital optical switch, yet the design of Y bifurcation angle is very little usually, generally be controlled between 0.05 ° to 0.15 °, this has increased technology difficulty to waveguide fabrication.Therefore people constantly start with from the structure of switch, design the switching device with some premium properties parameter, are integrated into a kind of effective method as adopting with variable optical attenuator (voa), can improve the extinction ratio of switch greatly.
The output waveguide end of common Y branch type 1 * 2DOS generally has the transition waceguide of one section S type bending, will export light and draw and be convenient to and be coupled with the standard fiber array.According to the curved waveguide theory, refractive index is not into step change type on the tangent plane in waveguide bend zone, and can equivalence be outward-dipping distribution, when distance increases laterally, the refractive index of covering constantly increases, even than examining the bigger of core district, electromagnetic field distributes also can be to the direction translation of refractive index increase, so produce radiation loss.In addition, conventional Y branching digital type photoswitch, very little thereby angle of forking α needs owing to be that the principle of utilizing Mode Coupling to separate realizes switching function, generally between 0.05 ° to 0.15 °, so this bifurcated waveguide fabrication technology difficulty is big.
Summary of the invention
Easily produce radiation loss according to curved waveguide, and utilize the negative index effect of material can be made into the characteristics of flexure type Variable Optical Attenuator, the purpose of this invention is to provide a kind of low digital optical switch of crosstalking.Directly utilize the S shape curve transition waveguide of Y bifurcated DOS type switch output waveguide, and its curved waveguide is designed to S shape curved waveguide variable optical attenuator (voa), formation is integrated with this Y bifurcated 1 * 2DOS's.
In order to achieve the above object, the technical solution used in the present invention is: constitute by a Y bifurcated waveguide digital optical switch and the S curved waveguide type variable optical attenuator that links to each other with Y bifurcated waveguide digital optical switch two ends respectively, made by organic polymer material are integrated, the electrode of S curved waveguide type variable optical attenuator part lays respectively at the little side of radius-of-curvature of S shape bending.
S curved waveguide type variable optical attenuator is connected the waveguide connection by connecting waveguide through tapered transitional waveguides, S curved waveguide, another tapered transitional waveguides successively with another, electrode edge in S curved waveguide edge one side is ± 1 micron apart from S shape curved waveguide Edge Distance, and the electrode of the S curved waveguide type variable optical attenuator part of both sides is in series with Y bifurcated waveguide digital optical switch partial electrode respectively.
The angle of forking α of Y bifurcated waveguide digital optical switch is at 0.3-1.0 °, and fills out the angle of forking filling part at crotch, and its top width d is 1.5-2 μ m.
The present invention compares the useful effect that has with background technology:
The present invention improves the crosstalk effect of switch light greatly under the prerequisite that does not increase device length and labyrinth.And can enlarge the angle of Y bifurcated, and adopted simultaneously bifurcation region was carried out structural modifications, reduced technology difficulty.According to BPM method (beam Propagation method) sunykatuib analysis, this new Digital photoswitch has that low to crosstalk, insert loss little, polarization correlated little, and the wave spectrum flatness is good, is easy to advantages such as integrated.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the design sketch of this switch light with the simulation of BPM method;
Fig. 2 is a digital optical switch structural representation of the present invention;
Fig. 3 is a digital switch light Y forked section structural representation of the present invention;
Fig. 4 is a S curved waveguide variable optical attenuator part-structure synoptic diagram in the digital switch light of the present invention;
Fig. 5 is the C-C diagrammatic cross-section of Fig. 2;
Fig. 6 is the D-D diagrammatic cross-section of Fig. 2.
Among the figure: 1, Y bifurcated waveguide digital optical switch, 2, S curved waveguide type variable optical attenuator, 3, input waveguide, 4, the angle of forking filling part, 5, Y bifurcated waveguide digital optical switch partial electrode, 6, Y forked section waveguide, 7, connect waveguide, 8, tapered transitional waveguides, 9, the electrode of S curved waveguide type variable optical attenuator part, 10, S curved waveguide, 11, silicon or glass substrate, 12, waveguide covering (promptly comprising the bound preparative layer).
Embodiment
As shown in Figure 2, constitute by a Y bifurcated waveguide digital optical switch 1 and the S curved waveguide type variable optical attenuator that links to each other with Y bifurcated waveguide digital optical switch 1 two ends respectively 2 are integrated.
As shown in Figure 4, S curved waveguide type variable optical attenuator 2 is connected waveguide 7 connections by connecting waveguide 7 through tapered transitional waveguides 8, S curved waveguide 10, another tapered transitional waveguides 8 successively with another, the electrode 9 of S curved waveguide type variable optical attenuator part lays respectively at the little side of radius-of-curvature of S shape bending; Electrode edge in waveguide edge one side is ± 1 micron apart from S shape curved waveguide Edge Distance, and the electrode 9 of the S curved waveguide type variable optical attenuator part of both sides is in series with Y bifurcated waveguide digital optical switch partial electrode 5 respectively.
As shown in Figure 3, the angle of forking α of Y bifurcated waveguide digital optical switch 1 is at 0.3-1.0 °, and fills out angle of forking filling part 4 at crotch, and its top width d is 1.5-2 μ m.
Fig. 5 is the cut-away view that C-C ' locates waveguiding structure among Fig. 2, on silicon or substrate of glass 11, makes waveguide covering 12 (containing the bound preparative layer) respectively, the electrode 9 of the sandwich layer of S curved waveguide 10 and S curved waveguide type variable optical attenuator part.
Fig. 6 is the cut-away view that D-D ' locates waveguiding structure among Fig. 2, on silicon or substrate of glass 11, makes waveguide covering 12 (containing the bound preparative layer) respectively, the electrode 5 of the sandwich layer of Y forked section waveguide 6 and Y bifurcated waveguide digital optical switch part.
To adopt organic polymer material, utilize its thermo-optic effect to come switch light function to be embodied as example.
According to Fig. 2,5,6 device and structural design, on silicon or substrate of glass, utilize the manufacture craft of conventional organic polymer waveguide spin-coating film to finish this element manufacturing.For wavelength is the light wave of 1.55 μ m, and the refractive index of waveguide is n=1.529/1.521 (a TE/TM mould), and sandwich layer, overlayer refringence are Δ n=0.005, and thermo-optical coeffecient is-2.5 * 10
-4/ K
-1, the thick 10 μ m of lower limit layer, core layer thickness is 7 μ m, sandwich layer and overlayer total thickness 19 μ m.Behind the Y bifurcated, be right after a S curved waveguide, the waveguide of Y crotch region with input, be connected duct width and choose 7 μ m, the duct width of S shape sweep is chosen 5 μ m, the waveguide of waveguide of Y crotch region and S shape sweep is by the tapered transmission line transition of 1000 μ m, and the radius-of-curvature of S shape sweep is greater than 600 μ m.The Y angle of forking is that α=0.4 a ° Y bifurcated wedge angle is partly filled up correction d=1.5 μ m, the space from end L=20 μ m of Y bifurcated; Electrode can adopt chromium one gold medal double-level-metal electrode, the about 200-300nm of thickness, the electrode of Y forked section is divided into two parts, width is identical with waveguide, the electrode in A district and the angle of waveguide are α, the electrode in B district is parallel with waveguide, and wherein the length of each electrode is relevant with the α angle with device material therefor character with particular location.Each design series connection electrode of the inboard of the bending of S curved waveguide, the electrode outer ledge overlaps substantially with the inboard of waveguide, and with the series connection of Y forked section electrode together.
The S curved waveguide partly has two effects, the one, with output terminal be separated into can with the distance of fiber array coupling, another effect is exactly the function that plays variable optical attenuator.When right electrodes is done the time spent, at first utilize the pattern separation principle of Y bifurcated, most luminous energies are coupled to the waveguide in left side, remaining few part luminous energy enters S shape curved waveguide, utilize the electrode effect of S curved waveguide this moment again, vertical direction in waveguide produces thermograde, because the negative thermo-optical coeffecient of polymeric material, form the refractive index gradient of corresponding vertical direction, make index distribution outward-dipping more severe, serious leakage takes place in the luminous energy on the horizontal direction, and remaining this few part luminous energy attenuates by the variable optical attenuator of S curved waveguide structure, so just can improve the extinction ratio performance of photoswitch greatly.Fig. 1 is for adopting the photoswitch design sketch of BPM method simulation.
The distribution of energy is mainly finished in the effect of Y bifurcated, the performance of High Extinction Ratio mainly realizes by variable optical attenuator, so its Y bifurcation angle can amplify, consider the problem that technology is made simultaneously, fill out the wedge angle part at crotch, the width that its top width is easily realized in general waveguide fabrication photoetching process is as 1.5 μ m, utilize BPM (beam Propagation method) sunykatuib analysis to show that the increase of the insertion loss that this correction causes is only about 0.15dB.The space from end of Y bifurcated (L) design is at 20 μ m, and bifurcated two ends generation this moment intercouples very little, can shorten Y bifurcated waveguide length like this.
Claims (2)
1. one kind is hanged down the digital optical switch of crosstalking, it is characterized in that: by a Y bifurcated waveguide digital optical switch (1) and the integrated formation of S curved waveguide type variable optical attenuator (2) that links to each other with a Y bifurcated waveguide digital optical switch (1) two ends respectively, made by organic polymer material, the electrode (9) of S curved waveguide type variable optical attenuator part lays respectively at the little side of radius-of-curvature of S shape bending.
2. the low digital optical switch of crosstalking according to claim 1, it is characterized in that: S curved waveguide type variable optical attenuator (2) is connected waveguide (7) connection by connecting waveguide (7) through tapered transitional waveguides (8), S curved waveguide (10), another tapered transitional waveguides (8) successively with another, electrode edge in S curved waveguide edge one side is ± 1 micron apart from S shape curved waveguide Edge Distance, and the electrode (9) of the S curved waveguide type variable optical attenuator part of both sides is in series with Y bifurcated waveguide digital optical switch partial electrode (5) respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101084082A CN1320400C (en) | 2003-11-01 | 2003-11-01 | Digital optical switch in low cross talk |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101084082A CN1320400C (en) | 2003-11-01 | 2003-11-01 | Digital optical switch in low cross talk |
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| CN1540427A CN1540427A (en) | 2004-10-27 |
| CN1320400C true CN1320400C (en) | 2007-06-06 |
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| CNB2003101084082A Expired - Fee Related CN1320400C (en) | 2003-11-01 | 2003-11-01 | Digital optical switch in low cross talk |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346047B (en) | 2016-05-04 | 2020-04-21 | 华为技术有限公司 | Optical switch |
| WO2017190481A1 (en) * | 2016-05-04 | 2017-11-09 | 华为技术有限公司 | Optical switch |
| CN106654488A (en) * | 2016-07-26 | 2017-05-10 | 上海阖煦微波技术有限公司 | Rapid connection attenuator based on flexible waveguide |
| CN107678098B (en) | 2016-08-01 | 2019-09-03 | 华为技术有限公司 | Photoswitch and optical switching system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1171658A (en) * | 1995-09-15 | 1998-01-28 | 美国电报电话公司 | Compact and fabrication tolerant high speed digital optical Y -switches |
| CN1448760A (en) * | 2003-04-03 | 2003-10-15 | 浙江大学 | Asymmetric electrode Y-branch waveguide digital optical switch |
-
2003
- 2003-11-01 CN CNB2003101084082A patent/CN1320400C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1171658A (en) * | 1995-09-15 | 1998-01-28 | 美国电报电话公司 | Compact and fabrication tolerant high speed digital optical Y -switches |
| CN1448760A (en) * | 2003-04-03 | 2003-10-15 | 浙江大学 | Asymmetric electrode Y-branch waveguide digital optical switch |
Non-Patent Citations (4)
| Title |
|---|
| Y分支有机聚合物热光开关的研制 杨建义 江晓清 杨方辉 王明华，光学学报，第22卷第6期 2002 * |
| Y分支有机聚合物热光开关的研制 杨建义 江晓清 杨方辉 王明华，光学学报，第22卷第6期 2002;韩国科研人员研制成塑料可变光衰减器,秦大甲译自《FIBER SYSTEM IN TERNATIONAL》2001,2(1):11 兴纤与电缆及其应用技术，第3期 2001;用于光纤通信的光开关研究进展 杨建义 江晓清 王明华，光通信研究，第4期 2000 * |
| 用于光纤通信的光开关研究进展 杨建义 江晓清 王明华，光通信研究，第4期 2000 * |
| 韩国科研人员研制成塑料可变光衰减器,秦大甲译自《FIBER SYSTEM IN TERNATIONAL》2001,2(1):11 兴纤与电缆及其应用技术，第3期 2001 * |
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