CN203241564U - Optical fiber waveguide spot size converter and optical coupler - Google Patents
Optical fiber waveguide spot size converter and optical coupler Download PDFInfo
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- CN203241564U CN203241564U CN 201320305072 CN201320305072U CN203241564U CN 203241564 U CN203241564 U CN 203241564U CN 201320305072 CN201320305072 CN 201320305072 CN 201320305072 U CN201320305072 U CN 201320305072U CN 203241564 U CN203241564 U CN 203241564U
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Abstract
The utility model provides an optical fiber waveguide spot size converter and an optical coupler. The optical fiber waveguide spot size converter comprises an upper cladding, a lower cladding and a waveguide core layer which is used for guiding an optical field and limiting an optical propagation path and is arranged between the upper cladding and the lower cladding. The waveguide core layer comprises a waveguide substrate and a ridged wave conductor, wherein the waveguide substrate is arranged on the lower cladding, the ridged wave conductor is located on the waveguide substrate, and height and width of the ridged wave conductor decrease linearly. The height and the width of the ridged wave conductor are set to linearly decrease to enable the ridged wave conductor to form a three-dimensional conical structure, and vertical and horizontal linear decrease enables sizes and shapes of an optical fiber mode and a waveguide mode to be gradually matched, thus realizing high-efficiency coupling between the two modes. The coupling efficiency from an optical fiber to a waveguide is improved, and loss in the process of optical propagation is reduced.
Description
Technical field
The utility model relates to technical field of optical fiber communication, particularly relates to a kind of fibre-optic waveguide spot-size converter and photo-coupler.
Background technology
In recent years, photonic integrated circuits is towards small size, highdensity future development.There are the silicon materials of high index to be applied to gradually making optical waveguide.This silicon optical waveguide is take silicon as sandwich layer, take the less silicon dioxide of refractive index as covering.Great refractive index difference is limited in the waveguide core layer light better between sandwich layer and covering, has greatly reduced the loss of light signal in isolator silicon based fiber waveguide device.Simultaneously, this silicon optical waveguide has less bending radius, is conducive to the efficiently integrated of photonic device.In addition, silicon-on-insulator material can be compatible with the CMOS manufacture craft, technical maturity, and cost is lower, has comparatively wide application prospect.In optics was integrated, what perplex for a long time the fiber waveguide device large-scale application was coupling between undersized waveguide and large-sized peripheral system such as the optical fiber etc. always.The diameter of single-mode fiber is about 9 microns, and optical waveguide is of a size of the 0.2-4 micron.The two direct-coupling efficient is extremely low, and this more important thing is the difference of light spread modes except the reason of the two refractive index difference.Not mating of the two inter mode size and dimension greatly reduces optical fiber to the coupling efficiency between waveguide, increased the propagation loss of light signal.Usually adopt the conical die spot-size converter to carry out the coupling of optical fiber and waveguide in the prior art.The conical die spot-size converter can be divided into two kinds of side taper and vertical taper.Its waveguiding structure has again ridge, buries type, single core and twin-core are not.The conical die spot-size converter of comparative maturity is the side taper, and it is in two-dimensional Linear or non-linearly gradual change, in the horizontal direction namely, so that light spread modes changes the waveguide basic mode into gradually from the optical fiber basic mode.This spot-size converter is owing to be subject to the restriction of vertical direction size, and communication mode is Gauss's basic mode of flat, greatly reduces optical fiber to the coupling efficiency of waveguide, causes the coupling efficiency of spot-size converter lower.
Summary of the invention
The utility model embodiment provides a kind of fibre-optic waveguide spot-size converter and photo-coupler, to solve the lower problem of coupling efficiency of spot-size converter in the prior art, realizes improving the coupling efficiency of fibre-optic waveguide spot-size converter.
The utility model provides a kind of fibre-optic waveguide spot-size converter, comprise: top covering, under-clad layer and the waveguide core layer that is used for guiding light field and confine light propagation path, described waveguide core layer is between described top covering and described under-clad layer, described waveguide core layer comprises waveguide matrix and ridge waveguide body, described waveguide matrix is arranged on the described under-clad layer, described ridge waveguide body is positioned on the described waveguide matrix, and the height of described ridge waveguide body and width be linear reduction all.
Further, an end of described ridge waveguide body is provided with the optical fiber joint end mouth, and the other end is provided with the waveguide connectivity port.
Further, the height value of described optical fiber joint end mouth is the 9-15 micron, and width value is the 9-15 micron.
Further, the height value of described waveguide connectivity port is the 1-5 micron, and width value is the 1-5 micron.
Further, also be provided with substrate below the described under-clad layer.
Further, described waveguide core layer is silicon.
Further, described top covering is silicon dioxide.
Further, described under-clad layer is silicon dioxide.
Further, described substrate is silicon.
The utility model also provides a kind of photo-coupler, comprise output optical fibre and input waveguide, it is characterized in that also comprise above-mentioned fibre-optic waveguide spot-size converter, described output optical fibre and described input waveguide are connected to the two ends of the waveguide core layer of described fibre-optic waveguide spot-size converter.
Fibre-optic waveguide spot-size converter and photo-coupler that the utility model provides, height and width by the ridge waveguide body are set to linear reduction, make the ridge waveguide body form three-dimensional pyramidal structure, and in vertical and the reduction of horizontal direction Linear the size and dimension of optical fiber and waveguide mode is mated gradually, thereby realize two kinds of efficient couplings between pattern.Improve the coupling efficiency of optical fiber to waveguide, reduced the loss in the light communication process.Simultaneously, larger refractive index difference between waveguide core layer and upper under-clad layer is limited in light in the sandwich layer better, so that realize that the required size of optical fiber and waveguide mode efficient coupling is less, it is integrated to be more suitable for the large-scale light path of small size.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or the description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the utility model fibre-optic waveguide spot-size converter embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, present embodiment fibre-optic waveguide spot-size converter, comprise: top covering 1, under-clad layer 2 and the waveguide core layer (not shown) that is used for guiding light field and confine light propagation path, waveguide core layer is between top covering 1 and under-clad layer 2, waveguide core layer comprises waveguide matrix 30 and ridge waveguide body 3, waveguide matrix 30 is arranged on the under-clad layer 2, and ridge waveguide body 3 is positioned on the waveguide matrix 30, and the height of ridge waveguide body 3 and width be linear reduction all.
Particularly, waveguide matrix 30 in the present embodiment fibre-optic waveguide spot-size converter and the profile of ridge waveguide body 3 have been determined the shape and size of light field, and ridge waveguide body 3 has been determined the travel path of light, because the height of ridge waveguide body 3 and width all linear reduction form three-dimensional pyramidal structure, improve so that the size and dimension of optical fiber and waveguide mode mates gradually at vertical and horizontal direction Linear gradual change type, thereby realize two kinds of efficient couplings between pattern.Wherein, be connected with waveguide with optical fiber for convenient, one end of ridge waveguide body 3 is provided with optical fiber joint end mouth 31, the other end is provided with waveguide connectivity port 32, the height value of optical fiber joint end mouth 31 is the 9-15 micron, width value is the 9-15 micron, optical fiber can be connected on the present embodiment fibre-optic waveguide spot-size converter by optical fiber joint end mouth 31, and the height value of waveguide connectivity port 32 is the 1-5 micron, width value is the 1-5 micron, waveguide can be connected on the present embodiment fibre-optic waveguide spot-size converter by waveguide connectivity port 32, realize being undertaken by present embodiment fibre-optic waveguide spot-size converter pattern conversion and the coupling of optical fiber and waveguide.Preferably, under-clad layer 2 belows also are provided with substrate 4, and waveguide core layer is silicon, and top covering 1 is silicon dioxide, under-clad layer 2 also is silicon dioxide, substrate 4 is silicon, and the refractive index of silicon is 3.4786, and the refractive index of silicon dioxide is 1.444, form larger refractive index difference between waveguide core layer and the upper under-clad layer, light better can be limited in the waveguide core layer, realize that the required size of optical fiber and waveguide mode efficient coupling is less, it is integrated to be more suitable for the large-scale light path of small size.
The utility model also provides a kind of photo-coupler, comprises output optical fibre and input waveguide, also comprises above-mentioned fibre-optic waveguide spot-size converter, and output optical fibre and input waveguide are connected to the two ends of the waveguide core layer of fibre-optic waveguide spot-size converter.
Fibre-optic waveguide spot-size converter and photo-coupler that the utility model provides, height and width by the ridge waveguide body are set to linear reduction, make the ridge waveguide body form three-dimensional pyramidal structure, and in vertical and the reduction of horizontal direction Linear the size and dimension of optical fiber and waveguide mode is mated gradually, thereby realize two kinds of efficient couplings between pattern.Improve the coupling efficiency of optical fiber to waveguide, reduced the loss in the light communication process.Simultaneously, larger refractive index difference between waveguide core layer and upper under-clad layer is limited in light in the sandwich layer better, so that realize that the required size of optical fiber and waveguide mode efficient coupling is less, it is integrated to be more suitable for the large-scale light path of small size.
It should be noted that at last: above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although with reference to previous embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (10)
1. fibre-optic waveguide spot-size converter, it is characterized in that, comprise: top covering, under-clad layer and the waveguide core layer that is used for guiding light field and confine light propagation path, described waveguide core layer is between described top covering and described under-clad layer, described waveguide core layer comprises waveguide matrix and ridge waveguide body, described waveguide matrix is arranged on the described under-clad layer, and described ridge waveguide body is positioned on the described waveguide matrix, and the height of described ridge waveguide body and width be linear reduction all.
2. fibre-optic waveguide spot-size converter according to claim 1 is characterized in that, an end of described ridge waveguide body is provided with the optical fiber joint end mouth, and the other end is provided with the waveguide connectivity port.
3. fibre-optic waveguide spot-size converter according to claim 2 is characterized in that, the height value of described optical fiber joint end mouth is the 9-15 micron, and width value is the 9-15 micron.
4. fibre-optic waveguide spot-size converter according to claim 2 is characterized in that, the height value of described waveguide connectivity port is the 1-5 micron, and width value is the 1-5 micron.
5. arbitrary described fibre-optic waveguide spot-size converter is characterized in that according to claim 1-4, and described under-clad layer below also is provided with substrate.
6. fibre-optic waveguide spot-size converter according to claim 5 is characterized in that, described waveguide core layer is silicon.
7. fibre-optic waveguide spot-size converter according to claim 5 is characterized in that, described top covering is silicon dioxide.
8. fibre-optic waveguide spot-size converter according to claim 5 is characterized in that, described under-clad layer is silicon dioxide.
9. fibre-optic waveguide spot-size converter according to claim 5 is characterized in that, described substrate is silicon.
10. photo-coupler, comprise output optical fibre and input waveguide, it is characterized in that also comprise arbitrary described fibre-optic waveguide spot-size converter such as claim 1-9, described output optical fibre and described input waveguide are connected to the two ends of the waveguide core layer of described fibre-optic waveguide spot-size converter.
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| CN 201320305072 CN203241564U (en) | 2013-05-30 | 2013-05-30 | Optical fiber waveguide spot size converter and optical coupler |
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| CN 201320305072 CN203241564U (en) | 2013-05-30 | 2013-05-30 | Optical fiber waveguide spot size converter and optical coupler |
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| WO2016008114A1 (en) * | 2014-07-16 | 2016-01-21 | 华为技术有限公司 | Spotsize converter and apparatus for optical conduction |
| CN105607185A (en) * | 2016-03-21 | 2016-05-25 | 中国科学院半导体研究所 | Structure for improving the coupling efficiency between submicron silicon waveguide and common single-mode fiber |
| CN105679875A (en) * | 2016-03-08 | 2016-06-15 | 昆明理工大学 | Waveguide integrated silicon-based single photon detector |
| CN106125195A (en) * | 2015-05-05 | 2016-11-16 | 华为技术有限公司 | Optical coupling mechanism |
| CN106133999A (en) * | 2014-02-06 | 2016-11-16 | 斯考皮欧技术有限公司 | The integrated type multi-stage taper coupler coupled with optical fiber for waveguide |
| CN106164723A (en) * | 2014-04-08 | 2016-11-23 | 华为技术有限公司 | Use the edge coupling of adiabatic tapered transmission line |
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| CN114935794B (en) * | 2022-06-16 | 2023-03-07 | 珠海光库科技股份有限公司 | Spot size converter, optical chip and optical communication device |
| CN115113328A (en) * | 2022-07-04 | 2022-09-27 | 上海交通大学 | Low-loss single-mode spot-size converter based on polymer waveguide and preparation method thereof |
| CN115113328B (en) * | 2022-07-04 | 2023-08-25 | 上海交通大学 | Low-loss single-mode spot-size converter based on polymer waveguide and preparation method thereof |
| CN115267972A (en) * | 2022-08-18 | 2022-11-01 | 吉林大学 | Spot-die converter based on polymer/silicon dioxide composite core layer structure |
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