CN207067445U - A kind of optical fiber - Google Patents
A kind of optical fiber Download PDFInfo
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- CN207067445U CN207067445U CN201720762458.XU CN201720762458U CN207067445U CN 207067445 U CN207067445 U CN 207067445U CN 201720762458 U CN201720762458 U CN 201720762458U CN 207067445 U CN207067445 U CN 207067445U
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Abstract
The utility model provides a kind of optical fiber, including：Elliptical core and around the elliptical core, several gully layers provided with leakage path, wherein the gully layer of most inner side is coated on the elliptical core, is provided with circular layer between arbitrary two gully layers, surrounding layer is also wrapped on outermost gully layer.The optical fiber of offer of the present utility model, compared to current technical scheme, there is advantages below：Ensure that this fiber design has good higher order mode rejection ability in bending, and there is larger foundational model field area, it is simple in construction, it is easy to manufacture.
Description
Technical field
Microstructured optical fibers field is the utility model is related to, more particularly to a kind of optical fiber.
Background technology
In recent years, because high-power single mode fiber laser and amplifier have good beam quality, small volume, operating cost
Low advantage, have started to be applied to industry, national defence, scientific research, medical treatment etc., and the demand to it is more and more urgent.Thousand
The continuous wave fiber laser system of watt magnitude and peak power for the Ultra-short Fiber Laser of GW magnitudes would is that futurity industry,
The basic tool of the industries such as national defence, scientific research, medical treatment., in order to accelerate application of the optical fiber laser in these fields
Ask fiber optic laser source further to improve power output, improve beam quality and reduce product cost.But non-linear phenomena and mould
Formula wild effect becomes the limiting factor for restricting fiber optic laser source power ascension and beam quality optimization.Pass through mode field area
Extension and single mode of operation can suppress these unfavorable factors.
Therefore, researcher has had devised and embodied a variety of big mode field area fibers, but most big mode field
Area fibers more or less have the shortcomings that certain, for example, it is complicated, manufacture difficulty is big, flexural property is poor etc. so that these light
It is fine to be restricted in practical application popularization.Such as：The Stepped-index distribution produced based on traditional optic fibre manufacturing technology
The numerical aperture of optical fiber is difficult to be less than 0.06, on the premise of ensureing that higher order mode rejection ability can meet application requirement,
Maximum mode field area is about 370 μm when it bends2；Ultralow numerical aperture can be realized using improved optic fibre manufacturing technology
Optical fiber, its numerical aperture can as little as 0.038,750 μm can be realized during bending2Mode field area, but manufacturing process rests in
External a few studies mechanism, it is difficult to which study is promoted.Stepped-index distribution is abandoned, using brand-new guide-lighting mechanism, can be achieved
Single-mode output is obtained while expanding mode field area, such as：Photon band-gap optical fiber (photonic bandgap fiber,
PBGF), photonic crystal fiber (photonic crystal fiber, PCF), leakage path type optical fiber (leakage channel
Fiber, LCF) and helical-core fiber (chirally-coupled-core fiber, CCCF) etc..This type optical fiber has very big
Mode field area and good higher order mode rejection ability, but such optic fibre manufacture process it is complicated, it is necessary to accurate heap rod and
Drawing process.The low-refraction multilayer gully type optical fiber (MTF) proposed in recent years has easily fabricated and good higher order mode
Rejection ability, but mode field area is less than 800 μm in the case of bending2。
Utility model content
In order to solve big mode field area fibers in the prior art be difficult to remain in that in a flexed condition according big mode field area and
Single mode transport state, the utility model provide a kind of optical fiber.
Optical fiber provided by the utility model, including：Elliptical core and around the elliptical core, it is provided with leakage path
Several gully layers, wherein the gully layer of most inner side is coated on the elliptical core, set between arbitrary two gully layers
There is circular layer, surrounding layer is also wrapped on outermost gully layer.
As further improvement of the utility model, the elliptical core, the circular layer, the leakage path and described
The refractive index of surrounding layer is all higher than the refractive index of the gully layer.
As further improvement of the utility model, the number of the gully layer is the integer more than or equal to 2.
As further improvement of the utility model, the surrounding layer and the difference of the refractive index of the gully layer are more than
0.001, preferably 0.001~0.007.
As further improvement of the utility model, the difference of the circular layer and the refractive index of the surrounding layer is -0.001
~0.001.
As further improvement of the utility model, the difference of the refractive index of the elliptical core and the surrounding layer for-
0.0005~0.0005.
As further improvement of the utility model, the number of the leakage path is two, respectively positioned at the ellipse
On the long side direction of fibre core.
As further improvement of the utility model, the leakage path is identical with the refractive index of the surrounding layer.
As further improvement of the utility model, can also be optimized by adjusting following optical fiber structure parameter to realize
Optic fibre characteristic, including：The length of the orthogonal both direction of elliptical core, the width of low-refraction gully layer, low refraction
The width of high index of refraction circular layer, the width of leakage path, elliptical core between the number of plies of rate gully layer, low-refraction gully layer
The difference of the refractive index of difference, low-refraction gully layer and surrounding layer with the refractive index of surrounding layer, high index of refraction circular layer with it is outer
The difference of the refractive index of covering.
On the one hand, the principle for suppressing higher order mode, the utility model are realized similar to MTF (multi-trench fiber)
Optical fiber utilize the resonance effect that is formed between multilayer low-refraction gully, or be interpreted as using elliptical core higher order mode and
The coupling of the covering leakage mode to match with its refractive index so that the higher order mode in elliptical core has larger transmission damage
Consumption, realizes the suppression to higher order mode in fibre core；On the other hand, optical fiber of the present utility model utilizes leakage path to high-order mode
The leakage effect of formula is greater than the leakage to basic mode so that the higher order mode in fibre core has larger transmission loss, realizes
Suppression to higher order mode in fibre core.
Optical fiber provided by the utility model, compared to current technical scheme, there is advantages below：
1) ensure that this fiber design has good higher order mode rejection ability in bending；
2) there is larger foundational model field area；
3) it is simple in construction, it is easy to manufacture.
Brief description of the drawings
Fig. 1 is the structural representation of optical fiber in the utility model embodiment；
Fig. 2 is refractive index distribution curve of the optical fiber shown in Fig. 1 when bending and being un-flexed on the AA ' lines of cross section, wherein curved
Song is oriented parallel to AA ' lines；
Wherein, 101, elliptical core；102nd, gully layer；103rd, circular layer；104th, leakage path；201st, surrounding layer.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.
In order to solve big mode field area fibers in the prior art be difficult to remain in that in a flexed condition according big mode field area and
Single mode transport state, the utility model provide a kind of optical fiber, the utility model are carried out below in conjunction with Fig. 1 and Fig. 2 further
Describe in detail.It should be appreciated that specific embodiment described herein does not limit this practicality only to explain the utility model
It is new.
Fig. 1 is the structural representation of optical fiber in the utility model embodiment, has three layers of low-refraction gully outside fibre core.This reality
A kind of three layers of low-refraction gully ellipse fuse optical fiber of double leakage paths for being used to export single-mode laser of example are applied, including it is oval fine
Core (101), the height being coated between the outer three layers of low-refraction gully layer (102) of elliptical core (101), low-refraction gully layer
Refractive index circular layer (103), leakage path (104) and surrounding layer (201) on the layer of low-refraction gully in both direction；It is described
The refractive index of low-refraction gully layer (102) is less than the refractive index in other regions (101,103,104,201) of optical fiber.Fig. 2 is figure
Refractive index distribution curve of the shown optical fiber when bending and being un-flexed on the AA ' lines of cross section, wherein bending direction is parallel to AA '
Line, and denote associated fiber structural parameters symbol.
In the present embodiment, refractive index difference (the Δ n of surrounding layer (201) and low-refraction gully layer (102)tr) be in
Between 0.001 to 0.007；The refractive index of high index of refraction circular layer (103) is identical with the refractive index of surrounding layer (201)；Fibre core (101)
With refractive index difference (the Δ n of surrounding layer (201)co) it is less than 0.0001；Fibre core bond length a is 50 μm, the long edge lengths b of fibre core is
100μm；Low-refraction gully (102) width t is between 1 μm to 8 μm.
In addition, in this embodiment, can by adjusting following optical fiber structure parameter optimization optic fibre characteristic, including：Fibre core
Bond length (a), long edge lengths (b), the width (t) of low-refraction gully (102), high index of refraction circular layer (103) width (d),
Leakage path width (tgap), refringence (the Δ n of low-refraction gully layer (102) and surrounding layer (201)tr), fibre core (101)
With refractive index difference (the Δ n of surrounding layer (201)co) etc..
The optical fiber that the utility model embodiment provides both has preferable higher order mode rejection ability, can realize again larger
Basic mode effective core area, and due to simple in construction, can be manufactured by traditional MCVD methods and drilling heap rod technique such a
Optical fiber.A kind of specific fiber manufacturing scheme is given below：
High low-refraction is deposited using modified chemical vapor deposition method (MCVD) in circular quartz inside pipe wall to distribute alternately
Sandwich construction and core layer, then by the way that in the radially non-uniform heating contracting rod of prefabricated rods, being made has multilayer low-refraction ditch
Gully ellipse fuse preform；By slotting or drilling on the low-refraction gully layer of prefabricated rods long side direction, phase is manufactured
Two spaces that adjacent angle is 180 °, with the thin rod filling space of the quartz of refractive index identical with covering, obtained and the utility model
The preform of optical fiber identical cross-section index distribution；This optical fiber is finally drawn, the temperature of wire drawing is controlled in wire drawing
Degree and tractive force so that fiber cross-sections shape keeps constant.
Comparative example
Comparative example and the difference of optical fiber structure in the utility model embodiment are, elliptical core therein is replaced
For circular core.It is now that both performance comparisons is as follows：
Circular core：We utilize numerical value emulation method, analyze the circular core optical fiber with double leakage path gullies
Higher order mode rejection ability and mode field area, its feature is that tool haves three layers low-refraction gully layer, two outside layers low-refraction ditch
Have on gully layer two leakage paths that angle is 180 ° (no leakage path most on the layer of internal leakage gully, be so designed that be for
Reduction fundamental mode loss, have no effect on the size of basic mode effective core area).It has following parameter：Core diameter D=50 μ
M, t=6 μm of gully thickness degree, high index of refraction circular layer thickness d=8 μm, gully layer and cladding refractive index difference Δ ntr=0.0012,
Leakage path width tgap=20 μm, bending direction and leakage path angle are 90 °, radius of curvature R=20cm, fibre core and outsourcing
The refractive index of layer is equal, and high index of refraction circular layer is equal with the refractive index of surrounding layer.Obtained by numerical analysis, higher order mode and base
Mode loss ratio is more than 100, and basic mode effective core area is 920 μm2。
Elliptical core：We utilize numerical value emulation method, analyze the elliptical core optical fiber with double leakage path gullies
Higher order mode rejection ability and mode field area, its feature is that tool haves three layers low-refraction gully layer, three layers of low-refraction gully layer
It is upper that there are two leakage paths that angle is 180 °.It has following parameter：Elliptical core short side is long a=50 μm, elliptical core
Long b=80 μm of the length of side, t=6 μm of gully thickness degree, high index of refraction circular layer thickness d=8 μm, gully layer and cladding refractive index are poor
Δntr=0.0012, leakage path width tgap=25 μm, bending direction and leakage path angle are 90 °, radius of curvature R=
20cm, fibre core is equal with the refractive index of surrounding layer, and high index of refraction circular layer is equal with the refractive index of surrounding layer.Obtained by numerical analysis
Arrive, higher order mode is more than 100 with fundamental mode loss ratio, and basic mode effective core area is 1400 μm2。
It can be seen that by extending the core size with the perpendicular direction of bending direction, i.e., circular core is replaced with into ellipse
Fibre core, and optimization design, on the premise of ensureing that there is preferable higher order mode rejection ability, it is effective bigger basic mode is obtained
Mode field area.
Embodiment of the present utility model is the foregoing is only, is not limited to the utility model, for this area
Technical staff for, the utility model can have various modifications and variations.It is all within the spirit and principles of the utility model,
Any modification, equivalent substitution and improvements made etc., it should be included within right of the present utility model.
Claims (8)
- A kind of 1. optical fiber, it is characterised in that including：If elliptical core and around the elliptical core, it is provided with leakage path Dry gully layer, wherein the gully layer of most inner side is coated on the elliptical core, is provided between arbitrary two gully layers Circular layer, surrounding layer is also wrapped on outermost gully layer.
- 2. optical fiber as claimed in claim 1, it is characterised in that the elliptical core, the circular layer, the leakage path and The refractive index of the surrounding layer is all higher than the refractive index of the gully layer.
- 3. optical fiber as claimed in claim 1, it is characterised in that the number of the gully layer is the integer more than or equal to 2.
- 4. optical fiber as claimed in claim 1, it is characterised in that the surrounding layer and the difference of the refractive index of the gully layer are big In 0.001.
- 5. optical fiber as claimed in claim 1, it is characterised in that the difference of the refractive index of the circular layer and the surrounding layer for- 0.001~0.001.
- 6. optical fiber as claimed in claim 1, it is characterised in that the elliptical core and the difference of the refractive index of the surrounding layer For -0.0005~0.0005.
- 7. optical fiber as claimed in claim 1, it is characterised in that the number of the leakage path is two, respectively positioned at described On the long side direction of elliptical core.
- 8. optical fiber as claimed in claim 7, it is characterised in that the leakage path is identical with the refractive index of the surrounding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720762458.XU CN207067445U (en) | 2017-06-27 | 2017-06-27 | A kind of optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720762458.XU CN207067445U (en) | 2017-06-27 | 2017-06-27 | A kind of optical fiber |
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| CN207067445U true CN207067445U (en) | 2018-03-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300738A (en) * | 2017-06-27 | 2017-10-27 | 中国电子科技集团公司电子科学研究院 | A kind of optical fiber |
| CN107300738B (en) * | 2017-06-27 | 2024-05-24 | 中国电子科技集团公司电子科学研究院 | Optical fiber |
-
2017
- 2017-06-27 CN CN201720762458.XU patent/CN207067445U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300738A (en) * | 2017-06-27 | 2017-10-27 | 中国电子科技集团公司电子科学研究院 | A kind of optical fiber |
| CN107300738B (en) * | 2017-06-27 | 2024-05-24 | 中国电子科技集团公司电子科学研究院 | Optical fiber |
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