CN105137542A - Mode converter based on conic gradient light waveguide - Google Patents
Mode converter based on conic gradient light waveguide Download PDFInfo
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- CN105137542A CN105137542A CN201510118366.3A CN201510118366A CN105137542A CN 105137542 A CN105137542 A CN 105137542A CN 201510118366 A CN201510118366 A CN 201510118366A CN 105137542 A CN105137542 A CN 105137542A
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- waveguide
- mode
- mode converter
- transmission line
- gradual change
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Abstract
The invention employs conic gradient light waveguide to realize a mode converter, belongs to the light communication field and particularly relates to conversion from a base-order LP01 mode to a high-order LP01m mode in the light mode reuse technology. The mode converter comprises a waveguide core cladding (1) and two segments of conic waveguide cores (2, 3) and (4, 5, 6), wherein a, the conic waveguide cores are uniformly covered by the waveguide core cladding (1); b, the first conic waveguide cores (2, 3) realize conic-to-column transition; c, the second conic waveguide cores (4, 5, 6) are embedded in the first conic waveguide cores (2, 3) and realize conic-to-column-to-conic transition. The mode converter is about the mode reuse technology in the light communication field, can realize high-efficiency mode conversion from the base-order LP01 mode to the high-order LP01m mode, moreover, if the high-order LP01m mode realizes injection from the (6) end, conversion from the base-order LP01 mode to the high-order LP01m mode can be further realized. Light waveguide structures can be circular and also can be rectangular.
Description
Technical field
The present invention relates to a kind of mode converter adopting conical gradual change optical waveguide to realize, belong to mode multiplexing technical field in optical communication.
Background technology
Fiber mode multiplexing (MDM) realizes the main method that optical fiber multiple-input and multiple-output (MIMO) communicates, and is the most direct method increasing fiber transmission link capacity.
In the multiplexing use less fundamental mode optical fibre (FMF) of fiber mode and multimode optical fiber, the pattern of same order does not carry out the transmission of MIMO signal, and each transmission mode is considered to be an independently single-mode fiber passage.When using fiber mode multiplexing, needing base rank patten transformation to become some higher order mode at transmitting terminal, in like manner, at receiving end, also needing the higher order mode of the information of lift-launch to convert base rank pattern to.
The mode converter of current report has geometrical optics mode converter, based on fiber grating and coupling fiber mode converter, based on the mode converter of silicon coupling mechanism; Based on the mode converter of silicon dioxide (silica) coupling mechanism, light tapered transmission line, crystal optical fibre, planar lightguide circuit, Y-crossing waveguide.Current technological attrition is high, size large or narrow bandwidth.At present, Japan devises a kind of mode converter based on Silica planar lightguide circuit, but does not comprise LP
01-LP
0mpatten transformation.
The mode converter of the present invention's design, by literature search, has no the open report identical with the present invention.
Summary of the invention
The present invention is overcoming on the not enough basis of prior art, and providing base rank patten transformation is the mode converter of higher order mode, and higher order mode is converted to the mode converter of base rank pattern.
The present invention applies two sections of tapered transmission line cores, and to realize base rank patten transformation be higher order mode, and the waveguide core of mode converter and clad material can be all silicon materials, but refractive index is slightly different.
The present invention realizes base rank pattern LP by the mode converter with two sections of conical gradual change waveguiding structures
01mould is to higher order mode LP
0mconversion.
A kind of mode converter adopting conical gradual change optical waveguide to realize of the present invention, comprising: waveguide core covering (1), two sections of tapered transmission line cores (2,3) and (4,5,6), wherein:
A. waveguide core covering (1) uniform fold tapered transmission line core;
B., from tapering transition to cylindricality, radius is from r for first paragraph waveguide core (2,3)
1(A point) gradual change rises to radius r
2(B point), and keep length constant until C point, form first mode converter;
C. second segment tapered transmission line core (4,5,6) is embedded in first paragraph tapered transmission line core, with first paragraph tapered transmission line core (2,3) concentrically axis, second segment tapered transmission line core (4,5,6) is again to taper from tapering transition to cylindricality, and radius is from 0(C point) gradual change increase until be stabilized in r
4(D point) also stablizes a segment length until E point, and then radius gradual change is reduced to exit point F, forms second mode converter.
The refractive index of first paragraph waveguide core (2,3) is n
1, waveguide core covering (1) refractive index is n
2, the refractive index of second segment tapered transmission line core (4,5,6) is n
3, and n
3<n
1.
Tapered transmission line core (6) can be removed, and does not affect conversion performance.
Optical waveguide structure can be round, also can be rectangle.
When using rectangular waveguide, pattern is accurate LP
0m, instead of strict LP
0mpattern.
The mode converter that the present invention adopts conical gradual change waveguide to realize, can realize the conversion of base rank pattern to higher order mode efficiently, equally, if higher order mode injects from (6) end, also can realize the conversion of higher order mode to low step mode.
Patent of the present invention only uses two conical gradual change optical waveguides, and structure is simple, and silicon materials loss used is low, be easy to integrated.The dependence of patten transformation to wavelength is low, is suitable for making broadband mode converter, has huge application prospect to following fiber mode multiplexed communications.
Accompanying drawing explanation
Fig. 1 is mode converter structural drawing.
Fig. 2 is by adjustment L
1length, first paragraph tapered transmission line core end obtain LP
0mthe normalized power of pattern.
Fig. 3 is LP on C-band
0mthe normalized power (conversion efficiency) of pattern and extinction ratio.The wherein middle m=4 of m=2, Fig. 3 (b) middle m=3, Fig. 3 (c) in Fig. 3 (a).
Embodiment
The mode converter that employing conical gradual change optical waveguide of the present invention realizes, its optical waveguide structure can be circular, also can be rectangle.This mode converter technically can realize in silicon dioxide (silica) planar lightguide circuit.Its structure as shown in Figure 1.Whole mode converter comprises waveguide core covering (1), two sections of tapered transmission line cores (2,3) and (4,5,6).Wherein, waveguide core covering (1) uniform fold tapered transmission line core., from tapering transition to cylindricality, radius is from r for first paragraph waveguide core (2,3)
1(A point) gradual change rises to radius r
2(B point) also stablizes a segment length until C point, and form first mode converter, wherein tapered transmission line core length is L
1(AB section), pole form guide core length is L
2(BC section).Second segment tapered transmission line core (4,5,6) is embedded in first paragraph tapered transmission line core, with first paragraph tapered transmission line core (2,3) axis altogether, second segment tapered transmission line core (4,5,6) is again to taper from tapering transition to cylindricality, and radius is from 0(C point) gradual change increase until be stabilized in r
4(D point) also stablizes a segment length until E point, and then radius gradual change reduction is until exit point F, and form second mode converter, wherein first paragraph tapered transmission line core length is L
3(CD section), pole form guide core length is L
4(DE section), second segment tapered transmission line core length is L
5(EF section).
The present invention is mode converter, is to be applied to optical mode multiplex technique in optical communication field.Patent mode converter structure of the present invention as shown in Figure 1.It is made up of waveguide core covering and two sections of conical gradual change waveguide core.Wherein, waveguide core covering (1) refractive index is n
2.First paragraph tapered transmission line core comprises two parts (2,3), and refractive index is n
1.Second segment pyramidal structure (4,5,6) is the waveguide core that one section of two ends is all fused longitudinally and tapered, and is embedded in first paragraph tapered transmission line core.The refractive index of kernel waveguide core is n
3(n
3<n
1).
Technical scheme of the present invention is achieved in that base rank pattern (LP
01) light inject from leftmost tapered transmission line core (as shown in Figure 1 (2)), tapered transmission line core introduce different propagation phases can to different patterns, by the length of adjustment tapered transmission line core, thus makes most light from LP
01mode convertion is to required LP
0mmould, although, still have the unexpected higher order mode of part (particularly LP
0k, k ≠ m) produce, but strengthen the conversion of desired pattern further by second segment tapered transmission line core (4,5,6), and suppress the conversion of unexpected pattern simultaneously.
Example is injected to from (2) below, by reference to the accompanying drawings 2 furthermore bright above-mentioned mode converters with base rank pattern.Work as LP
01when mould (base rank pattern) is injected into mode converter from (2), by adjustment L
1length, LP
0mthe power of (m=2,3,4) pattern can along with AB segment length L
1change and change.Terminate the standard output power (only consider first paragraph structure here and keep other parameter constants) at (B) place at first paragraph tapered transmission line core, can L be found out
1the change of length is on the impact of mode conversion efficiency.For example, to a LP
01be transformed into LP
02mode converter, L
1optimum length near 200 microns.But to LP
01be transformed into LP
03mode converter, L
1optimum length near 100 microns.Certainly, only cannot obtain desired performance by this section of tapered transmission line core, therefore, need to introduce the overall performance that the embedded tapered transmission line core (4,5,6) of second segment improves converter, ensure LP
01the power of pattern is almost all transformed into the LP desired by
0min pattern.
Fig. 3 (a), Fig. 3 (b), be respectively (1530-1560nm) LP on C-band shown in Fig. 3 (c)
01to LP
02, LP
03and LP
04conversion time normalized power (conversion ratio or efficiency) and extinction ratio (ER
mk).Here ER
mk=P
lP0m, out/ P
lP0k, out.Wherein, P
lP0m, outthe power of mode converter output terminal.Can clearly be seen that, the conversion efficiency of three mode converters on whole C-band has all exceeded 86%, meanwhile, and the LP that three mode converters export
0mpattern and other unexpected high-order LP
0kextinction ratio between pattern has also all exceeded 15 decibels.Here, three LP started most are just illustrated
0mmould.But in fact, by adjusting the size scale of its each several part and using identical structure, can be used for equally realizing LP on C-band
01mould is to other high-orders LP
0m(m>4) conversion of pattern.Wherein, tapered transmission line core (6) can be removed, and does not affect overall conversion performance.And when using rectangular waveguide, pattern is accurate LP
0m, instead of strict LP
0mpattern.
Claims (5)
1. the mode converter adopting conical gradual change optical waveguide to realize, is characterized in that, the mode converter that this employing conical gradual change optical waveguide realizes comprises: waveguide core covering (1), two sections of tapered transmission line cores (2,3) and (4,5,6), wherein:
A. waveguide core covering (1) uniform fold tapered transmission line core;
B., from tapering transition to cylindricality, radius is from r for first paragraph waveguide core (2,3)
1(A point) gradual change rises to radius r
2(B point) also stablizes a segment length until C point, forms first mode converter;
C. second segment tapered transmission line core (4,5,6) is embedded in first paragraph tapered transmission line core, with first paragraph tapered transmission line core (2,3) concentrically axis, second segment tapered transmission line core (4,5,6) is again to taper from tapering transition to cylindricality, and radius is from 0(C point) gradual change increase until be stabilized in r
4(D point) also stablizes a segment length until E point, and then radius gradual change is reduced to exit point F, forms second mode converter.
2. a kind of mode converter adopting conical gradual change waveguide to realize as claimed in claim 1, is characterized in that:
The refractive index of first paragraph waveguide core (2,3) is n
1, waveguide core covering (1) refractive index is n
2, the refractive index of second segment tapered transmission line core (4,5,6) is n
3, and n
3<n
1.
3. the mode converter adopting conical gradual change waveguide to realize as claimed in claim 1, is characterized in that:
Tapered transmission line core (6) can be removed, and does not affect conversion performance.
4. the mode converter adopting conical gradual change waveguide to realize as claimed in claim 1, it is characterized in that: optical waveguide structure can be round, also can be rectangle; This mode converter technically can realize in silicon dioxide (silica) planar lightguide circuit.
5. the mode converter adopting conical gradual change waveguide to realize as claimed in claim 1, is characterized in that: when using rectangular waveguide, pattern is accurate LP
0m, instead of strict LP
0mpattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510118366.3A CN105137542B (en) | 2015-03-18 | 2015-03-18 | Mode converter based on conical gradual change fiber waveguide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510118366.3A CN105137542B (en) | 2015-03-18 | 2015-03-18 | Mode converter based on conical gradual change fiber waveguide |
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|---|---|
| CN105137542A true CN105137542A (en) | 2015-12-09 |
| CN105137542B CN105137542B (en) | 2018-04-06 |
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| CN201510118366.3A Active CN105137542B (en) | 2015-03-18 | 2015-03-18 | Mode converter based on conical gradual change fiber waveguide |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291820A (en) * | 2016-10-13 | 2017-01-04 | 兰州大学 | A kind of silicon-based integrated optical mode data exchange unit |
| CN107290825A (en) * | 2017-06-15 | 2017-10-24 | 云南大学 | Mode converter based on bipyramid combining structure |
| CN108519641A (en) * | 2018-05-11 | 2018-09-11 | 兰州大学 | A kind of restructural optical mode conversion device |
| CN109459819A (en) * | 2019-01-07 | 2019-03-12 | 云南大学 | Efficient multi-mode converter |
| CN109459818A (en) * | 2018-12-24 | 2019-03-12 | 云南大学 | A kind of cascade broadband mode converter of multistage gradual change fibre core |
| CN113376742A (en) * | 2021-06-18 | 2021-09-10 | 哈尔滨理工大学 | Parameter selection method of simple high-conversion-rate conical mode converter |
| WO2021248639A1 (en) * | 2020-06-11 | 2021-12-16 | 山东明灿光电科技有限公司 | Planar optical waveguide chip and waveguide-type single-mode optical fiber laser device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050185893A1 (en) * | 2004-02-20 | 2005-08-25 | Ansheng Liu | Method and apparatus for tapering an optical waveguide |
| JP2009047784A (en) * | 2007-08-15 | 2009-03-05 | Nippon Telegr & Teleph Corp <Ntt> | Mode converter |
-
2015
- 2015-03-18 CN CN201510118366.3A patent/CN105137542B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050185893A1 (en) * | 2004-02-20 | 2005-08-25 | Ansheng Liu | Method and apparatus for tapering an optical waveguide |
| JP2009047784A (en) * | 2007-08-15 | 2009-03-05 | Nippon Telegr & Teleph Corp <Ntt> | Mode converter |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291820A (en) * | 2016-10-13 | 2017-01-04 | 兰州大学 | A kind of silicon-based integrated optical mode data exchange unit |
| CN106291820B (en) * | 2016-10-13 | 2019-01-25 | 兰州大学 | A kind of silicon-based integrated optical mode data exchange unit |
| CN107290825A (en) * | 2017-06-15 | 2017-10-24 | 云南大学 | Mode converter based on bipyramid combining structure |
| CN107290825B (en) * | 2017-06-15 | 2023-08-04 | 云南大学 | Mode converter based on bipyramid integrated configuration |
| CN108519641A (en) * | 2018-05-11 | 2018-09-11 | 兰州大学 | A kind of restructural optical mode conversion device |
| CN109459818A (en) * | 2018-12-24 | 2019-03-12 | 云南大学 | A kind of cascade broadband mode converter of multistage gradual change fibre core |
| CN109459818B (en) * | 2018-12-24 | 2023-11-21 | 云南大学 | Broadband mode converter of multistage gradual change fiber core cascade connection |
| CN109459819A (en) * | 2019-01-07 | 2019-03-12 | 云南大学 | Efficient multi-mode converter |
| CN109459819B (en) * | 2019-01-07 | 2023-09-12 | 云南大学 | Efficient multimode converter |
| WO2021248639A1 (en) * | 2020-06-11 | 2021-12-16 | 山东明灿光电科技有限公司 | Planar optical waveguide chip and waveguide-type single-mode optical fiber laser device |
| CN113376742A (en) * | 2021-06-18 | 2021-09-10 | 哈尔滨理工大学 | Parameter selection method of simple high-conversion-rate conical mode converter |
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|---|---|
| CN105137542B (en) | 2018-04-06 |
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