CN110568556A - Planar optical waveguide type optical splitter with customizable return loss and waveguide type optical device - Google Patents
Planar optical waveguide type optical splitter with customizable return loss and waveguide type optical device Download PDFInfo
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- CN110568556A CN110568556A CN201910968504.5A CN201910968504A CN110568556A CN 110568556 A CN110568556 A CN 110568556A CN 201910968504 A CN201910968504 A CN 201910968504A CN 110568556 A CN110568556 A CN 110568556A
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- Prior art keywords
- waveguide
- return loss
- waveguide type
- path
- type optical
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- 230000003287 optical effect Effects 0.000 title claims abstract description 55
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910002601 GaN Inorganic materials 0.000 claims description 3
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 3
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/125—Bends, branchings or intersections
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Integrated Circuits (AREA)
Abstract
The invention discloses a return loss customizable planar optical waveguide type optical splitter, which comprises a main waveguide path and waveguide branches extending outwards from the main waveguide path, wherein the main waveguide path and/or at least one waveguide branch are/is divided into a plurality of sections of waveguides through at least one inclined structure. The return loss of any channel of the optical splitter can be changed, and the optical splitter with the corresponding return loss can be customized.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a planar optical waveguide type optical splitter with adjustable and customized return loss.
background
the planar optical waveguide type optical splitter has the advantages of compact structure, easy integration, excellent performance, high reliability and the like, so that the planar optical waveguide type optical splitter becomes an important device for realizing the functions of splitting and combining light in an optical communication system. The optical splitter can distribute the light energy to different branches, and can also couple the energy of each branch back to the main path. With the application and popularization of optical splitter networks, the requirements for optical splitters are also diversified. In order to detect the network system, the return loss customization requirement of the optical splitter is provided. The return loss requirements of the optical splitter are different in numerical values due to the design of different networks, but the return loss of the existing optical splitter is fixed, the return loss numerical value cannot be customized and accurately adjusted, and an independent branch cannot be adjusted. Therefore, the return loss of the prior art is required to be lower than a certain range, and specific values of the return loss are not explicitly required.
Disclosure of Invention
the invention aims to provide a planar optical waveguide type optical splitter with customizable return loss, which can change the return loss of any channel of the optical splitter and customize the corresponding return loss.
Another object of the present invention is to provide a waveguide type optical device with a customizable return loss, which can customize a waveguide type optical device with a desired return loss.
The technical scheme for realizing the purpose is as follows:
A return loss customizable planar optical waveguide type optical splitter comprises a main waveguide path and waveguide branches extending outwards from the main waveguide path, wherein the main waveguide path and/or at least one waveguide branch are/is divided into a plurality of sections of waveguides through at least one inclined structure.
Preferably, an included angle between the inclined structure and the normal direction of the waveguide is an inclined angle θ for adjusting return loss.
Preferably, the main waveguide path and the branch waveguide path are silicon dioxide waveguides, silicon nitride waveguides, silicon oxynitride waveguides, indium phosphide waveguides or gallium nitride waveguides.
An optical device of the waveguide type with customizable return loss comprises a waveguide path divided into a plurality of segments of waveguides by at least one slanted structure.
The invention has the beneficial effects that: the invention adds the inclined structure in the optical splitter or the waveguide type optical device, increases the section with changed refractive index to increase the return loss of the optical path, and simultaneously changes the inclined angle of the inclined structure to adjust different return loss values. The blank that the optical splitter or the optical device with the required return loss cannot be customized in the prior art is filled.
Drawings
Fig. 1 is a schematic structural view of one embodiment of a planar optical waveguide type optical splitter of the present invention;
FIG. 2 is a schematic view of the present invention with the angled structure vertical;
FIG. 3 is a schematic view of the inclined structure of the present invention when inclined;
FIG. 4 is a graph showing the variation of the tilt angle with respect to the return loss in the present invention;
FIG. 5 is a schematic view of an inclined structure composed of two sections according to the present invention;
FIG. 6 is a schematic view of an inclined structure composed of three sections according to the present invention;
Fig. 7 is a schematic structural view of another embodiment of the planar optical waveguide type optical splitter of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, the planar optical waveguide type optical splitter with customizable return loss of the present invention includes a main waveguide 1 and each waveguide branch 2 extending from the main waveguide 1, wherein the main waveguide 1 and/or at least one waveguide branch 2 are divided into multiple sections of waveguides by at least one slanted structure 3. The slanted structure 3 consists of a waveguide at both ends and a mid-section. In fig. 1, a slope structure 3 is added to one waveguide arm 2. In particular, the amount of the solvent to be used,
the invention increases the change of refractive index introduced by the section, and the light wave can be reflected at the interface, which is the basic principle of the invention. According to the normal incidence reflection formula, as is the case when the slanted structure 3 is vertical in fig. 2.
The maximum reflectance R can be achieved at this time. The following equation:
Wherein n is1Is the refractive index of the waveguide core, n2Is the waveguide cladding index, the maximum reflectivity R of the vertical reflection is determined by the indices of refraction of the two materials of the waveguide.
In order to vary the power of the return loss, the tilt angle of the tilted structure 3 is changed, introducing a tilt angle θ, as shown in fig. 3, one of the tilted structures 3 in fig. 3. The return loss rate varies due to the tilt angle θ.
In fig. 3, the optical mode field in the waveguide is approximately gaussian, and the coupling efficiency η between the reflected light and the incident light can be calculated according to the following formula:
Where ω is the gaussian mode field radius of the waveguide, β is the waveguide propagation constant, β ═ kn, k is the vacuum wavenumber, and n is the waveguide effective refractive index.
The formula for calculating the return loss RL is the product of the reflected light energy and the coupling ratio, as follows:
RL＝10×lg(R·η)
For example, when a waveguide platform with 2.5% index contrast is used, ω is 3, n1＝1.481,n2the results shown in fig. 4 can be obtained by 1.444, k 2 pi/1.55 and R0.00016. The purpose of adjusting the return loss can be achieved by adjusting the tilt angle theta.
Meanwhile, if the waveguide platform with lower reflectivity cannot achieve higher return loss even when the tilt angle θ is zero, periodic structures such as two tilt structures 3 in fig. 5 and 3 tilt structures 3 in fig. 6 can be added as shown in fig. 5 and 6. The reflectivity R can be greatly increased by the aid of the added periodic structure, and return loss can be adjusted by means of different inclination angles.
in addition, as shown in fig. 7, by adding the slope structure 3 to the main waveguide 1, the return loss of all the optical channels can be changed at the same time.
The main waveguide path 1 and the branch waveguide path 2 are silicon dioxide waveguide, silicon nitride waveguide, silicon oxynitride waveguide, indium phosphide waveguide or gallium nitride waveguide.
The inclined structure 3 structure of the invention is not only suitable for an optical splitter, but also suitable for any optical device adopting a waveguide structure, the waveguide type optical device comprises a waveguide path, and the inclined structure 3 is additionally arranged on the waveguide path. And the return loss is adjusted.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (4)
1. A return loss customizable planar optical waveguide type optical splitter comprises a main waveguide path and each waveguide branch extending outwards from the main waveguide path, and is characterized in that the main waveguide path and/or at least one waveguide branch are/is divided into a plurality of sections of waveguides through at least one inclined structure.
2. The return loss customizable optical splitter of planar optical waveguide type according to claim 1, wherein the angle between the tilted structure and the normal direction of the waveguide is a tilt angle θ for adjusting the return loss.
3. The return loss customizable optical splitter of planar optical waveguide type according to claim 1, wherein the main waveguide path and the branch waveguide path are silica waveguide, silicon nitride waveguide, silicon oxynitride waveguide, indium phosphide waveguide or gallium nitride waveguide.
4. an optical device of the waveguide type with customizable return loss, comprising a waveguide path, characterized in that said waveguide path is divided into a plurality of segments of waveguides by at least one tilted structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968504.5A CN110568556A (en) | 2019-10-12 | 2019-10-12 | Planar optical waveguide type optical splitter with customizable return loss and waveguide type optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968504.5A CN110568556A (en) | 2019-10-12 | 2019-10-12 | Planar optical waveguide type optical splitter with customizable return loss and waveguide type optical device |
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| Publication Number | Publication Date |
|---|---|
| CN110568556A true CN110568556A (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910968504.5A Pending CN110568556A (en) | 2019-10-12 | 2019-10-12 | Planar optical waveguide type optical splitter with customizable return loss and waveguide type optical device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05273432A (en) * | 1992-03-27 | 1993-10-22 | Fujikura Ltd | Optical waveguide module |
| GB9815628D0 (en) * | 1997-07-28 | 1998-09-16 | Samsung Electronics Co Ltd | Planar waveguide device having segment waveguides |
| CN1206869A (en) * | 1997-07-28 | 1999-02-03 | 三星电子株式会社 | Plane waveguiding device with sectional waveguide |
| CN102645708A (en) * | 2012-04-10 | 2012-08-22 | 浙江大学 | Optical waveguide resonant cavity with high polarization extinction ratio based on inclined waveguide grating structure |
| CN210803773U (en) * | 2019-10-12 | 2020-06-19 | 上海鸿辉光通科技股份有限公司 | Planar optical waveguide type optical splitter with customizable return loss and waveguide type optical device |
-
2019
- 2019-10-12 CN CN201910968504.5A patent/CN110568556A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05273432A (en) * | 1992-03-27 | 1993-10-22 | Fujikura Ltd | Optical waveguide module |
| GB9815628D0 (en) * | 1997-07-28 | 1998-09-16 | Samsung Electronics Co Ltd | Planar waveguide device having segment waveguides |
| CN1206869A (en) * | 1997-07-28 | 1999-02-03 | 三星电子株式会社 | Plane waveguiding device with sectional waveguide |
| CN102645708A (en) * | 2012-04-10 | 2012-08-22 | 浙江大学 | Optical waveguide resonant cavity with high polarization extinction ratio based on inclined waveguide grating structure |
| CN210803773U (en) * | 2019-10-12 | 2020-06-19 | 上海鸿辉光通科技股份有限公司 | Planar optical waveguide type optical splitter with customizable return loss and waveguide type optical device |
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