CN103728694B - A kind of broadband optical fiber mode converter - Google Patents
A kind of broadband optical fiber mode converter Download PDFInfo
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- CN103728694B CN103728694B CN201310685773.3A CN201310685773A CN103728694B CN 103728694 B CN103728694 B CN 103728694B CN 201310685773 A CN201310685773 A CN 201310685773A CN 103728694 B CN103728694 B CN 103728694B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 30
- 239000000835 fiber Substances 0.000 claims abstract description 135
- 230000008859 change Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 17
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000007704 transition Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004038 photonic crystal Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
The open a kind of optical fibre mode converter of the present invention.This optical fibre mode converter is three core fibres, is made up of fibre core I, II, III.The center of three fibre cores is a straight line, and fibre core I and fibre core III is distributed in fibre core II both sides.Normalized frequency V of fibre core I1Meet V1< 2.405, normalized frequency V of fibre core II2Meet V2> 2.405, normalized frequency V of fibre core III3Meet V3> 3.832, and meet V1<V2<V3.Use three core fibre structures, it is achieved that different optical fiber basic modes and the conversion of high-order mode, by the transition of middle model, be effectively increased the conversion efficiency between the high-order mode of optical fiber basic mode and required conversion.Use simple three core fibre structures, particularly can use microstructured optical fibers processing technology, and without introducing airport, use and simplify processing technology, it is to avoid the complexity that the later stage of band airport optical fiber processes, it is possible to realize mass production.
Description
Technical field
The present invention relates to fiber optic communication field, be specifically related between implementation pattern the optical fibre mode converter of conversion.
Background technology
Along with less fundamental mode optical fibre technology and the development of application thereof, mode converter, as Primary Component therein, receives more
Carry out the most attention.Optical fibre mode converter is a kind of device realizing and changing between optical fiber different mode field.Preferably optical fiber
Mode converter should be able to effectively change corresponding modes, has wider bandwidth of operation, and ensures that output mode has low crosstalk.
Have already been proposed several device being applicable to fiber mode conversion, most common of which is based on fiber grating
Mode converter, but its bandwidth of operation is narrower.It is proposed optically-based holographic technique and multi-module optical fiber coupler
Mode converter [Journal of Lightwave Technology, 2012,30 (12): 1978-1984].
Use optical fiber structure and can change with implementation pattern based on coupling principle.Use twin-core fiber structure also can realize this
Planting function, and can be used for dispersion compensation [Appl. Opt., 2012,51 (19): 4388-4393], its bandwidth of operation is 22
nm.Use photonic crystals optical fiber structure also can implementation pattern conversion [a kind of optical fibre mode converter, application number:
200810021652.8], but structure is more complicated, increases manufacture difficulty.
Summary of the invention
Not enough for prior art, a kind of simple structure broadband optical fiber mode converter is proposed, can be at the widest bandwidth model
Enclose interior work.
The present invention solves technical problem be the technical scheme is that, this optical fibre mode converter is a kind of three core light
Fibre, is made up of fibre core I, II, III.The center of three fibre cores is a straight line, and fibre core I and fibre core III is distributed in fibre core II both sides.
Normalized frequency V of fibre core I1Meet V1< 2.405, normalized frequency V of fibre core II2Meet V2> 2.405, fibre core III returns
One changes frequency V3Meet V3> 3.832, and meet V1<V2<V3。
As the further improvement of this programme, in band of operation, the effective index of fundamental mode n of fibre core Ieff1And fibre
The effective refractive index n of the high-order mode 1 of core IIeff2Difference meet | neff1-neff2|<10-3, effective refraction of the high-order mode 1 of fibre core II
Rate neff2Effective refractive index n with the high-order mode 2 of fibre core IIIeff3Difference meet | neff2-neff3|<10-3.Fibre core I and fibre core II
Fiber core distance d1≤ 6 μm, fibre core II and fibre core III fiber core distance d2≤6μm。
As the further improvement of this programme, fibre core I and centre distance d of fibre core II1, in fibre core II and fibre core III
Heart distance d2Between meet: d1>d2。
The invention has the beneficial effects as follows: use three core fibre structures, it is achieved that different optical fiber basic modes and the conversion of high-order mode,
By the transition of middle model, it is effectively increased the conversion efficiency between the high-order mode of optical fiber basic mode and required conversion.And due to
The existence of middle fiber core, different patterns transmits in different fibre cores, and the pattern of output is single pattern, will not mix it
Its unwanted pattern, the spacing of input fibre core and output fibre core is remote, it is ensured that the input pattern in input fibre core is with defeated
Go out the low crosstalk between the output mode in fibre core.Use simple three core fibre structures, particularly can use micro structure light
Fine processing technology, and without introducing airport, use and simplify processing technology, it is to avoid the later stage of band airport optical fiber processes
Complexity, it is possible to realize mass production.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of the present invention.
Fig. 2 is the LP of fibre core I in structure shown in Fig. 101Mould, the LP of fibre core II11Mould and the LP of fibre core III02Effective folding of mould
Penetrate the relation schematic diagram of rate and wavelength.
When for there is not fibre core II in Fig. 3, the LP of fibre core I01Mould and the LP of fibre core III02Connecting curve between mould；
Fig. 4 is the LP of fibre core I in Fig. 1 institute structure01Mould and the LP of fibre core III02Connecting curve between mould；
Fig. 5 is the relation schematic diagram of energy and the wavelength finally exported from fibre core I and fibre core III in Fig. 1 institute structure.
Wherein, 1 is host material, and 2 is fibre core I, and 3 is fibre core II, and 4 is fibre core III.
Detailed description of the invention
As it was previously stated, just can realize when in twin-core fiber, in two fibre cores, the effective refractive index of different mode is equal mutually
Conversion.But when needs realize broadband mode conversion, it is desirable to the effective refractive index of two patterns all has in wide wave-length coverage
Little refractivity, for simple multi-core fiber, owing to fibre core adjustable parameter is less, is difficult to meet requirements above.Adopt
Although can realize this requirement with microstructured optical fibers, but optical fiber structure can be caused complicated, manufacture difficulty increases.For this reason, it may be necessary to
Explore other effective method.
Fig. 1 is the schematic diagram of an embodiment of the present invention.Optical fiber is made up of homogeneous cladding, fibre core I, II, III.Three fibres
The center of core is a straight line, and fibre core I and fibre core III is distributed in fibre core II both sides.Normalized frequency V of fibre core I1Meet V1<
2.405, normalized frequency V of fibre core II2Meet V2> 2.405, normalized frequency V of fibre core III3Meet V3> 3.832, and full
Foot V1<V2<V3.This structure can realize the higher order mode being converted to by the basic mode in fibre core I in fibre core III.If fibre core II
The higher order mode that can transmit is mode A.The higher order mode that fibre core III can transmit is B-mode.Due to V2<V3, mode A order
Less than B-mode.By the transition of fibre core II, can effective enhancement mode coupling efficiency.Its process is, first, and the basic mode in fibre core I
It is converted into the mode A of fibre core II, then through coupling with fibre core III, is converted to B-mode.
Fig. 2 is the LP of fibre core I in structure shown in Fig. 101Mould, the LP of fibre core II11Mould and the LP of fibre core III02Effective folding of mould
Penetrate the relation schematic diagram of rate and wavelength, if fibre core I and fibre core III direct-coupling, i.e. LP01Mould is directly and LP02Mode coupling, its turn
Change efficiency will be decreased obviously.And when making the LP of fibre core01The first LP with fibre core I of mould11Mould couples, then makes the LP of fibre core II11Mould
LP with fibre core III02When mould occurs coupling, its coupling efficiency can significantly improve.
Fig. 3 is fibre core I and transmission curve during fibre core III direct-coupling, as seen from the figure, now can only realize 88.6%
Energy is changed.And when using three-core structure, it is capable of the energy conversion of more than 97.9%, as shown in Figure 4.As can be seen here,
Fibre core II is to its effect substantially.
Fig. 5 gives optical fiber of the present invention when basic mode light is from fibre core I input, and when fibre core III exports, its output spectrum is bent
Line.As seen from the figure, this structure can realize handing over the patten transformation of conversion efficiency in wider wave-length coverage.Also may be used from figure
Going out, in the wavelength zone that the effective refractive index difference of three fibre core corresponding modes is less, its mode conversion efficiency is high.
When needs realize LP01Mould and LP02During conversion between mould, fibre core I, fibre core II, the normalized frequency of fibre core III
V1、V2、V3V should be met1< 2.405, V2> 2.405 and V3> 3.832 and V1<V2<V3.This is because fibre core II, fibre core III are respectively required for
LP to be transmitted11And LP02Mould, should have V for this2> 2.405 and V3>3.832.If the normalized frequency of fibre core II is bigger than fibre core III,
Then due to the relation of index disturbance, patten transformation will be affected by other pattern.The basic mode of fibre core I is to fibre core II's
High-order mode couples, and its effective index of fundamental mode should be relatively low, and now, the fibre core of fibre core I is less with clad refractive rate variance or fine
Core diameter is less, normalized frequency defineUnderstanding, its normalized frequency should be less than returning of fibre core II
One changes frequency, therefore, should have V2<V3.I.e. should there is V1<V2<V3。
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described.The present embodiment realizes basic mode LP01Mould and LP02Between mould
Conversion.
Embodiment:
As it is shown in figure 1, the clad material of fibre core I, II, III is pure quartz.The core diameter of fibre core I is 8 μm, fibre core
Being 0.005 with clad refractive rate variance, the core diameter of fibre core II is 11.5 μm, and fibre core and clad refractive rate variance are 0.007, fibre core
Spacing 14 μm of I and fibre core II fibre core, the core diameter of fibre core III is 15 μm, and fibre core with clad refractive rate variance is
Spacing 16.9 μm of 0.009, fibre core II and fibre core III fibre core.LP in fibre core I01LP in mould, fibre core II11Mould and fibre core III
In LP02The effective refractive index of mould is with the relation of wavelength as shown in Figure 2.The length of optical fiber is taken as 3.9 mm.Big in conversion efficiency
Wave-length coverage in 80% is 1.47 ~ 1.522 nm, and its bandwidth of operation is up to 52nm.
Above-mentioned accompanying drawing is only explanatory view, does not form protection scope of the present invention and limits.Should be understood that these are real
Execute the example present invention solely for the purpose of illustration, rather than limit the scope of the present invention by any way.
Claims (2)
1. an optical fibre mode converter, it is characterised in that this optical fibre mode converter is three core fibres, by fibre core I,
II, III form, and the center of three fibre cores is a straight line, and fibre core I and fibre core III is distributed in fibre core II both sides, the normalizing of fibre core I
Change frequency V1Meet V1< 2.405, normalized frequency V of fibre core II2Meet V2> 2.405, normalized frequency V of fibre core III3Full
Foot V3> 3.832, and meet V1<V2<V3, in band of operation, the effective index of fundamental mode n of fibre core Ieff1With fibre core II's
The effective refractive index n of high-order mode 1eff2Difference meet | neff1-neff2|<10-3, the effective refractive index n of the high-order mode 1 of fibre core IIeff2
Effective refractive index n with the high-order mode 2 of fibre core IIIeff3Difference meet | neff2-neff3|<10-3。
Optical fibre mode converter the most according to claim 1, it is characterised in that fibre core I and centre distance d of fibre core II1,
Fibre core II and centre distance d of fibre core III2Between meet: d1>d2。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310685773.3A CN103728694B (en) | 2013-12-16 | 2013-12-16 | A kind of broadband optical fiber mode converter |
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| CN103728694B true CN103728694B (en) | 2016-10-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2998515A1 (en) * | 2015-08-13 | 2017-02-16 | Nufern | Mode mixing optical fibers and methods and systems using the same |
| US10630040B2 (en) * | 2016-02-05 | 2020-04-21 | Nufern | Mode mixing optical fibers and methods and systems using the same |
| CN107422573B (en) * | 2017-08-31 | 2022-08-30 | 中国地质大学（武汉） | Optical fiber structure for adjustable wavelength conversion |
| CN112162355A (en) * | 2020-09-18 | 2021-01-01 | 北京交通大学 | Optical fiber mode selection coupler based on symmetrical double-core few-mode optical fiber |
| CN113376731B (en) * | 2021-05-17 | 2022-09-13 | 北京邮电大学 | Few-mode dual-core optical power beam splitter unit and integrated optical power beam splitter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6538807B2 (en) * | 2000-09-07 | 2003-03-25 | Sumitomo Electric Industries, Ltd. | Amplification optical fiber, fiber optic amplifier, optical transmitter, and optical communication system |
| US7412142B2 (en) * | 2006-05-19 | 2008-08-12 | Corning Incorporated | Optical fiber with plurality of air holes and stress rods |
| CN101339269A (en) * | 2008-08-12 | 2009-01-07 | 江苏大学 | Optical fibre wavelength-division multiplex device |
| US7697809B2 (en) * | 2007-07-31 | 2010-04-13 | Corning Incorporated | Polarization maintaining and single polarization optical fiber |
| CN103154790A (en) * | 2010-10-05 | 2013-06-12 | 株式会社藤仓 | Polarization-maintaining optical fiber |
| CN203838366U (en) * | 2013-12-16 | 2014-09-17 | 国家电网公司 | Broadband optical fiber mode converter |
-
2013
- 2013-12-16 CN CN201310685773.3A patent/CN103728694B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6538807B2 (en) * | 2000-09-07 | 2003-03-25 | Sumitomo Electric Industries, Ltd. | Amplification optical fiber, fiber optic amplifier, optical transmitter, and optical communication system |
| US7412142B2 (en) * | 2006-05-19 | 2008-08-12 | Corning Incorporated | Optical fiber with plurality of air holes and stress rods |
| US7697809B2 (en) * | 2007-07-31 | 2010-04-13 | Corning Incorporated | Polarization maintaining and single polarization optical fiber |
| CN101339269A (en) * | 2008-08-12 | 2009-01-07 | 江苏大学 | Optical fibre wavelength-division multiplex device |
| CN103154790A (en) * | 2010-10-05 | 2013-06-12 | 株式会社藤仓 | Polarization-maintaining optical fiber |
| CN203838366U (en) * | 2013-12-16 | 2014-09-17 | 国家电网公司 | Broadband optical fiber mode converter |
Non-Patent Citations (1)
| Title |
|---|
| Mode splitter based on triple-core waveguide;Zhi Wang etc;<Optics Express>;20061030;第14卷(第22期);10324-10331 * |
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