CN109581582A - A kind of two mode fiber of low-loss low crosstalk single - Google Patents
A kind of two mode fiber of low-loss low crosstalk single Download PDFInfo
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- CN109581582A CN109581582A CN201910066742.7A CN201910066742A CN109581582A CN 109581582 A CN109581582 A CN 109581582A CN 201910066742 A CN201910066742 A CN 201910066742A CN 109581582 A CN109581582 A CN 109581582A
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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02047—Dual mode fibre
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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
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- Optics & Photonics (AREA)
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Abstract
The invention proposes a kind of two mode fibers of low-loss low crosstalk single；Optical fiber is made of fibre core, inner cladding, depressed cladding and surrounding layer with graded--index planar waveguides；The optical fiber realizes low loss performance using the graded index core of pure silicon dioxide；Low crosstalk performance is realized using big effective refractive index difference；Bending loss is effectively reduced using depressed cladding.
Description
Technical field
The present invention relates to a kind of two mode fibers of low-loss low crosstalk single, can be applied to optical fiber optics, fiber optic communication, optical fiber
The fields such as wireless access, optical Information Processing and generation information technology.
Background technique
In recent years, various traffic flows exponential increases, single mode fiber communications receive unprecedented challenge.Optical fiber
Communicating industry, this physical dimension passes communication network around space division multiplexing (including core type multiplexing and mode division multiplexing and its combination)
Defeated capacity realizes breakthrough；Multi-core optical fiber and less fundamental mode optical fibre research in space division multiplexing become forward position research hotspot [Guifang
Li, Neng Bai, and Ningbo Zhao and Cen Xia, Space-division multiplexing:the next
Frontier in optical communication.Advances in Optics & Photonics, 2014,6 (4):
5041-5046；Guifang Li, Magnus Karlsson, Xiang Liu, and Yves Quiquempois, Focus
Issue introduction:space-division multiplexing, Opt.Express 2014,22,32526-
32527；He Wen, Hongjun Zheng et al.Few-mode fibre-optic microwave photonic
Links [J] .Light:Science and Applications 2017,6,8；Zheng Hongjun, Li Xin, Bai Chenglin, chirped pulse
Transmission in a fiber, Beijing: Science Press, 2018,1-184]；Pure silicon dioxide fibre core can be effectively reduced optical fiber and decline
Subtract and splice loss, splice attenuation, is mostly applied to single mode optical fiber (T.Hasegawa et al.Advances in ultra-low at present
Loss silica fibers [J] .Frontiers in Optics, 2016, paper FTu2B.2；S.Ten.Ultra Low-
Loss Optical Fiber Technology [J] .Optical Fiber Communication Conference, 2016,
paper Th4E.5；Yoshiaki Tamura.Ultra-low loss silica core fiber for long haul
Transmission [J] .Optical Fiber Communication Conference, 2018, paper M4B.1).Have
Low difference modes group delay DMGD and far field and near field, which may be implemented, in the less fundamental mode optical fibre of graded--index planar waveguides has identical molds
Formula width, and the effective refractive index poor (ERID) under different mode is greater than 0.5x10-3It can be to avoid Mode Coupling (Pierre
Sillard et al.Few-Mode Fibers for Space-Division Multiplexed Transmissions
[J], European Conference & Exhibition on Optical Communication, 2013.03 (A1): 1-
3；Roland Ryf.Switching and Multiplexing Technologies for Mode-Division
Multiplexed Networks, Optical Fiber Communication Conference & Exposition,
2017, Tu2c；Zheng Hongjun, Li Xin, Bai Chenglin, the transmission of chirped pulse in a fiber, Beijing: Science Press, 2018,1-
184).To sum up, it if the concept of pure silicon dioxide fibre core, graded--index planar waveguides and less fundamental mode optical fibre is organically blended, is expected to solve
The research challenge of less fundamental mode optical fibre at present has important learning value and application value, and research significance is great, has a extensive future.
Summary of the invention
In state natural sciences fund (number 61671227 and 61431009), Shandong Province's Natural Science Fund In The Light
(ZR2011FM015), under " Mount Taishan scholar " construction project specific project expenditure is supported, the invention proposes a kind of low-loss low crosstalk lists
Two mode fiber of core；The optical fiber has merged the advantages of pure silicon dioxide fibre core, graded--index planar waveguides and less fundamental mode optical fibre, is optical fiber light
The further investigation in the fields such as, fiber optic communication, optical-fiber wireless access, optical Information Processing and generation information technology provides weight
It supports.
The technical solution adopted by the present invention to solve the technical problems is:
The invention proposes a kind of two mode fibers of low-loss low crosstalk single；Optical fiber is by the fibre with graded--index planar waveguides
Core, inner cladding, depressed cladding and surrounding layer composition；Fibre core axle center is pure silicon dioxide refractive index n1=1.444024, fibre core half
R1=20 μm of diameter；Followed by inner cladding, inner cladding refractive index n2=1.442524, R2=30 μm of inner cladding outer diameter；Followed by
Be depressed cladding, depressed cladding refractive index n3=1.439724, depressed cladding outer diameter is R3=40 μm；It is surrounding layer outward again,
Cladding refractive index is also n2=1.442524, and the outer diameter of surrounding layer is R4=100 μm；Fibre core is according to n=1.444024 [1-2 Δ
(r/a)2]0.5Graded--index planar waveguides, r are that the distance in axle center, a is fibre core outer diameter at any point in fibre core, core centre with it is interior
Packet index differential between layers
Characteristics of modes can be changed by changing size, position and the index distribution of fibre core, interior surrounding layer and depressed cladding in optical fiber
Become.
Beneficial effects of the present invention are as follows:
1. few mould running that the optical fiber realizes LP01 and LP11 both of which；
2. the optical fiber uses the graded index core of pure silicon dioxide, low loss performance is realized；The optical fiber is using big
Effective refractive index is poor, realizes low crosstalk performance, further improves fiber transmission performance；
3. the optical fiber uses depressed cladding, bending loss can be effectively reduced；
It is optical fiber light 4. the optical fiber has merged the advantages of pure silicon dioxide fibre core, graded--index planar waveguides and less fundamental mode optical fibre
, fiber optic communication, optical-fiber wireless accesses and the further investigation in the fields such as optical Information Processing, generation information technology provides weight
It supports；
5. in the optical fiber Characteristics of modes of two-mode can by change fibre core, interior surrounding layer and depressed cladding size,
Position and index distribution change.
Detailed description of the invention
Fig. 1 is a kind of two mode fiber cross-sectional view of low-loss low crosstalk single of the present invention；Optical fiber with gradual change by rolling over
It is (white to penetrate surrounding layer in the fibre core (left oblique dash area), depressed cladding (right oblique dash area) and fluorine doped silica of rate distribution
Color part) composition；
Fig. 2 gives the mentioned two mode effective refractive indexs of optical fiber of the present invention with the situation of change of input wavelength, band in Fig. 2
The solid line of small circle and asterisk respectively indicates the effective refractive index of LP01 and LP11 both of which with the variation feelings of lambda1-wavelength
Condition；
Fig. 3 is situation of change of the mentioned fibre-optical dispersion of the present invention with wavelength, Fig. 3 (a) dotted line, chain-dotted line and solid line point
Not Biao Shi LP11 mode material dispersion DM, waveguide dispersion DWWith total dispersion DT；
Specific embodiment
Below with reference to the embodiment and attached drawing technical solution that the present invention will be described in detail, but protection scope is without being limited thereto.
1 Fig. 1 of embodiment is a kind of two mode fiber cross-sectional view of low-loss low crosstalk single of the present invention；Optical fiber is by having
Have inside and outside the fibre core (left oblique dash area), depressed cladding (right oblique dash area) and fluorine doped silica of graded--index planar waveguides
Covering (white portion) composition；Fibre core axle center be pure silicon dioxide refractive index n1=1.444024, R1=20 μm of fiber core radius；Tightly
Followed by inner cladding, inner cladding refractive index n2=1.442524, R2=30 μm of inner cladding outer diameter；Followed by be depressed cladding,
Depressed cladding refractive index n3=1.439724, depressed cladding outer diameter are R3=40 μm；It is surrounding layer, cladding refractive index outward again
It is also n2=1.442524, the outer diameter of surrounding layer is R4=100 μm；Fibre core is according to n=1.444024 [1-2 Δ (r/a)2]0.5Gradually
Variable refractivity distribution, r is that the distance in axle center, a is fibre core outer diameter at any point in fibre core, is reflected between core centre and inner cladding
Rate is poorMould field in optical fiber
Characteristic can be changed by changing size, position and the index distribution of fibre core, interior surrounding layer and depressed cladding.
Fig. 2 gives the mentioned two mode effective refractive indexs of optical fiber of the present invention with the situation of change of input wavelength.Band in Fig. 2
The solid line of small circle and asterisk respectively indicates the effective refractive index of LP01 and LP11 both of which with the variation feelings of lambda1-wavelength
Condition.Fig. 2 is available, and the effective refractive index difference of LP01 and LP11 are greater than 0.5 × 10-3, realize low mode crosstalk performance；LP01
Increase with the effective refractive index of LP11 with lambda1-wavelength and reduces；For same incident wavelength, effective refraction of LP11 mode
The effective refractive index of rate ratio LP01 mode is small；When incident wavelength is 1.55 μm, the effective refractive index of LP01 and LP11 mode
Difference is 0.552 × 10-3。
Fig. 3 is situation of change of the mentioned fibre-optical dispersion of the present invention with wavelength, Fig. 3 (a) dotted line, chain-dotted line and solid line point
Not Biao Shi LP11 mode material dispersion DM, waveguide dispersion DWWith total dispersion DT.Material dispersion and total dispersion as seen from the figure
General trend increases with the increase of wavelength.In 1.43 μm -1.65 μm of wave-length coverage, the waveguide dispersion of LP11 is close to zero color
Dissipate and at flat trend, cause the total dispersion of LP11 approximately equal with material dispersion.Solid line and chain-dotted line generation respectively in Fig. 3 (b)
The waveguide dispersion D of table LP01 mode and LP11 modeWWith the situation of change of lambda1-wavelength.As seen from the figure, this optical fiber
The waveguide dispersion D of LP01 and LP11 both of whichWClose to zero dispersion and at flat trend in 1.5 μm of -1.65 μ m wavelength range.
Total dispersion DTIn 1.5 μm -1.65 μm of wave-length coverage near 20ps/ (nmkm), with document [Zheng Hongjun, Li Xin, Bai Cheng
Woods, the transmission of chirped pulse in a fiber, Beijing: Science Press, 2018,1-184] in it is consistent.
In short, the optical fiber proposed realizes the both of which running of low-loss, low crosstalk.It should be pointed out that specific
Embodiment is the more representational example of the present invention, it is clear that technical solution of the present invention is not limited to the above embodiments, also
There can be many variations.Those skilled in the art define written description disclosed or according to file with the present invention
It undoubtedly obtains, is considered as this patent scope of the claimed.
Claims (2)
1. a kind of two mode fiber of low-loss low crosstalk single；It is characterized by: the optical fiber is by the fibre with graded--index planar waveguides
Core, inner cladding, depressed cladding and surrounding layer composition；Fibre core axle center is pure silicon dioxide refractive index n1=1.444024, fibre core half
R1=20 μm of diameter；Followed by inner cladding, inner cladding refractive index n2=1.442524, R2=30 μm of inner cladding outer diameter；Followed by
Be depressed cladding, depressed cladding refractive index n3=1.439724, depressed cladding outer diameter is R3=40 μm；It is surrounding layer outward again,
Cladding refractive index is also n2=1.442524, and the outer diameter of surrounding layer is R4=100 μm；Fibre core is according to n=1.444024 [1-2 Δ
(r/a)2]0.5Graded--index planar waveguides, r are that the distance in axle center, a is fibre core outer diameter at any point in fibre core, core centre with it is interior
Packet index differential between layers
Characteristics of modes can be changed by changing size, position and the index distribution of fibre core, interior surrounding layer and depressed cladding in optical fiber
Become.
2. optical fiber according to claim 1, performance characteristic is to have merged pure silicon dioxide fibre core, graded--index planar waveguides
And the advantages of less fundamental mode optical fibre, realize low-loss, the two-mode of low crosstalk lack mould running, effectively reduced using depressed cladding curved
Song loss.
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| CN201910066742.7A CN109581582A (en) | 2019-01-23 | 2019-01-23 | A kind of two mode fiber of low-loss low crosstalk single |
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| CN201910066742.7A CN109581582A (en) | 2019-01-23 | 2019-01-23 | A kind of two mode fiber of low-loss low crosstalk single |
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| CN109581582A true CN109581582A (en) | 2019-04-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111443421A (en) * | 2020-05-22 | 2020-07-24 | 聊城大学 | Low-loss ring core few-mode optical fiber |
| CN113359237A (en) * | 2021-07-02 | 2021-09-07 | 聊城大学 | Low-crosstalk elliptical core few-mode multiplexer/demultiplexer |
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| CN105408784A (en) * | 2013-06-26 | 2016-03-16 | 德拉卡康泰克公司 | Bend-insensitive multimode optical fiber with reduced impact of leaky modes |
| CN108415120A (en) * | 2018-02-09 | 2018-08-17 | 长飞光纤光缆股份有限公司 | A kind of two mode fibers of ultralow decaying of gradation type |
| CN109188603A (en) * | 2018-09-25 | 2019-01-11 | 长飞光纤光缆股份有限公司 | Small core diameter graded index fiber |
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2019
- 2019-01-23 CN CN201910066742.7A patent/CN109581582A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105408784A (en) * | 2013-06-26 | 2016-03-16 | 德拉卡康泰克公司 | Bend-insensitive multimode optical fiber with reduced impact of leaky modes |
| CN108415120A (en) * | 2018-02-09 | 2018-08-17 | 长飞光纤光缆股份有限公司 | A kind of two mode fibers of ultralow decaying of gradation type |
| CN109188603A (en) * | 2018-09-25 | 2019-01-11 | 长飞光纤光缆股份有限公司 | Small core diameter graded index fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111443421A (en) * | 2020-05-22 | 2020-07-24 | 聊城大学 | Low-loss ring core few-mode optical fiber |
| CN113359237A (en) * | 2021-07-02 | 2021-09-07 | 聊城大学 | Low-crosstalk elliptical core few-mode multiplexer/demultiplexer |
| CN113359237B (en) * | 2021-07-02 | 2023-02-03 | 聊城大学 | Low-crosstalk elliptical core few-mode multiplexer/demultiplexer |
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