CN2556660Y - Low loss branch coupler - Google Patents
Low loss branch coupler Download PDFInfo
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- CN2556660Y CN2556660Y CN 02265426 CN02265426U CN2556660Y CN 2556660 Y CN2556660 Y CN 2556660Y CN 02265426 CN02265426 CN 02265426 CN 02265426 U CN02265426 U CN 02265426U CN 2556660 Y CN2556660 Y CN 2556660Y
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- waveguide
- branch
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- loss
- coupler
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Abstract
The utility model pertains to the technical field of optical signal wave guide power division in an optical element, in particular to a low-loss branched coupler. The utility model comprises an input waveguide, a branched waveguide and an output waveguide and is characterized in that a multimode waveguide is arranged between the input waveguide and the branched waveguide, and the input waveguide, the branched waveguide and the output wave guide are connected into a whole. Since the utility model is provided with the multimode waveguide, low supplementary loss is realized when output is symmetrical; while the output is unsymmetrical, the low supplementary loss is realized and large light splitting ratio is provided as well, thereby creating beneficial conditions for the industrialized production and application of the low-loss branched waveguide coupler.
Description
Technical field
The utility model belongs to light signal wave guide power branch technical field in the optical element, particularly relates to a kind of low loss branch coupler.
Background technology
Branch coupler is the basic structural unit of making power splitter, M-Z interferometer, mixing integrated light-switching device, its available multiple made, in numerous waveguide materials, SiO 2 waveguide on the silicon base is because of having lower propagation loss and high optical coupling efficiency, in optical integrated device is made, be widely used, and its structure generally is made up of input waveguide 1, branch-waveguide 2 and output waveguide 3.All in actual applications Y branch couplers can be divided into symmetry output and asymmetric output two classes by the light energy output ratio, when symmetry is exported, need to realize alap added losses; And when asymmetric output, it is adjustable then to require to have simultaneously low added losses and big splitting ratio.Lower added loss when realizing symmetrical output state, people have taked to increase and have made complicacy or improve modes such as manufacture process requirement; And to the situation of asymmetric output, people have also studied some and have improved the scheme of structures, but the result is when increasing branch's output than scope, has also increased added losses simultaneously; Since make optical integrated device exist conventional fabrication error or for the convenience of manufacture craft, the angle that forms between two branches of the branch-waveguide that feasible technology is routinely made not is a perfect wedge angle, but have certain spacing 4, this has just influenced the performance parameter of traditional branch-waveguide greatly, as the homogeneity of added losses and cascade branch coupler etc.
Summary of the invention
In order to solve the performance index of bringing at regular intervals between existing two branched angulations of Y branch coupler (as homogeneity in added losses and the cascade etc.) problem, the utility model solves by the following technical solutions: it comprises input waveguide, branch-waveguide and output waveguide, it is characterized in that being provided with multimode waveguide between described input waveguide and the branch-waveguide, the three is connected into one.Owing to be provided with multimode waveguide in the utility model, under symmetry output situation, after light entered multimode waveguide from input waveguide, multimode waveguide can change the distribution of light wave fields, thereby had reduced the loss that couples light to branch-waveguide; Under asymmetric output situation, by being displaced sideways the position of input waveguide, the light wave that then enters multimode waveguide can evoke multimode waveguide odd symmetry eigenmode, mutual interference because of odd symmetry eigenmode and even symmetry eigenmode, can form the asymmetric distribution of glistening light of waves field at the output terminal of multimode waveguide, when being coupled to branch-waveguide, realize the asymmetric output of whole coupling mechanism.Therefore, the utlity model has and can when the output symmetry, realize lower added loss: and have the advantage of big splitting ratio when when output is asymmetric, can realize lower added loss, for advantage has been created in the industrialization production and the application of low loss branch waveguide coupler.
Description of drawings
Fig. 1 is traditional Y branch coupler structural representation
Fig. 2 is the structural representation of traditional Y branch coupler branch wedge angle
Fig. 3 is a structural representation of the present utility model
Embodiment
With reference to accompanying drawing: the utility model comprises input waveguide 5, branch-waveguide 8 and output waveguide 9, be provided with multimode waveguide 7 between described input waveguide 5 and the branch-waveguide 8, the three is connected into one, on input waveguide 5, be provided with a tapered transmission line 6, for reducing loss, this taper input waveguide 6 is close with the width of multimode waveguide 7 connecting places, and certain spacing 12 is arranged between branch-waveguide 8, and branch-waveguide 8 is the cosine function curve-like with the curve that output waveguide 9 forms.
Because have the eigenmode of two excitations in multimode waveguide 7 at least, therefore, the width 11 of multimode waveguide 7 should satisfy following formula:
W≥λ/n
c 2+n
s 2 (1)
λ is the wavelength in the vacuum herein, n
c 2, n
s 21 is respectively the equivalent refractive index of waveguide core layer and coating.In the pattern of multimode waveguide 7 transmission, basic mode and second order eigenmode account for major weight, therefore, select the length 10 of multimode waveguide 7 should satisfy formula:
L=N is towering/(β
0+ β
2) (2)
β in the formula (2)
0, β
2Be respectively the propagation constant of basic mode and second order eigenmode, N is an odd number.
In utility model, be provided with the transition zone of multimode waveguide 7 as the y branch waveguide structure, and on input waveguide 5, be provided with tapered transmission line 6, this tapered transmission line 6 plays a part to connect multimode waveguide 7, (MPA) can learn by the mode propagation analysis, width for specific multimode waveguide 7, when the width of input waveguide increased, the weight of the low order eigenmode that is energized increased, so radiation loss reduces.Can the calculating of transmitted beam propagation method for numerical simulation try to achieve as for the tapered transmission line 6 and the concrete width of multimode waveguide 7.
The utlity model has simple in structure, reasonable in design, easy to make, it has been realized at lower added loss under the symmetry output situation, realized splitting ratio big under the lower added loss under asymmetric output situation, the application's design philosophy is not only applicable to the power splitter spare of silicon dioxide optical waveguide, also be applicable to optical waveguide power splitter spare, for advantage has been created in the industrialization production and the application of low loss branch waveguide coupler based on other materials (as lithium niobate, SOI, high molecular polymer etc.).
Claims (5)
1. a low loss branch coupler comprises input waveguide (5), branch-waveguide (8) and output waveguide (9), it is characterized in that being provided with multimode waveguide (7) between described input waveguide (5) and the branch-waveguide (8), and the three is connected into one.
2. according to claim 1 low loss branch coupler, it is characterized in that described input waveguide (5) is provided with a tapered transmission line (6).
3. according to claim 1 low loss branch coupler, it is characterized in that described taper input waveguide (6) is close with the width of multimode waveguide (7) connecting place.
4. according to claim 1 low loss branch coupler, it is characterized in that the described certain spacing (12) that between branch-waveguide (8), has.
5. according to claim 1 low loss branch coupler, it is characterized in that described branch-waveguide (8) and the formed curve of output waveguide (9) are the cosine function curve-like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02265426 CN2556660Y (en) | 2002-07-09 | 2002-07-09 | Low loss branch coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02265426 CN2556660Y (en) | 2002-07-09 | 2002-07-09 | Low loss branch coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2556660Y true CN2556660Y (en) | 2003-06-18 |
Family
ID=33731451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02265426 Expired - Fee Related CN2556660Y (en) | 2002-07-09 | 2002-07-09 | Low loss branch coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2556660Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338068A (en) * | 2013-06-28 | 2013-10-02 | 华中科技大学 | Light splitting monitoring device based on multi-channel parallel optical signals |
| CN106290257A (en) * | 2016-08-03 | 2017-01-04 | 大连理工大学 | A kind of integrated waveguide optical biochemical sensor based on spectrum division and method |
| CN106908903A (en) * | 2017-03-08 | 2017-06-30 | 湖北捷讯光电有限公司 | A kind of 90 degree of optical mixers of coupler type |
-
2002
- 2002-07-09 CN CN 02265426 patent/CN2556660Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338068A (en) * | 2013-06-28 | 2013-10-02 | 华中科技大学 | Light splitting monitoring device based on multi-channel parallel optical signals |
| CN103338068B (en) * | 2013-06-28 | 2016-04-13 | 华中科技大学 | A kind of point photo detector based on multi-channel parallel light signal |
| CN106290257A (en) * | 2016-08-03 | 2017-01-04 | 大连理工大学 | A kind of integrated waveguide optical biochemical sensor based on spectrum division and method |
| CN106908903A (en) * | 2017-03-08 | 2017-06-30 | 湖北捷讯光电有限公司 | A kind of 90 degree of optical mixers of coupler type |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |