CN206020713U - Double-clad photon crystal optical fibre - Google Patents
Double-clad photon crystal optical fibre Download PDFInfo
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- CN206020713U CN206020713U CN201621068731.0U CN201621068731U CN206020713U CN 206020713 U CN206020713 U CN 206020713U CN 201621068731 U CN201621068731 U CN 201621068731U CN 206020713 U CN206020713 U CN 206020713U
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- layer
- airport
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- air hole
- inner cladding
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Abstract
This utility model discloses double-clad photon crystal optical fibre, and including fibre core, inner cladding and surrounding layer, wherein, it is n that optical fiber bulk material is refractive index1=1.44 vitreous silica, fibre core is made up of the airport of a disappearance, inner cladding is made up of the little airport of ground floor, the second layer, surrounding layer is made up of third layer, the 4th layer of air hole, after employing such scheme this utility model PCF be made up of double clad be primarily due to double-clad structure not only cause couple difficulty reduce, and with unique dispersion characteristics, be easy to adjust, work as d1When=0.5 μm, designed optical fiber can be caused lowest loss occur at λ=1.55 μm, up to 7.39 × 10‑6DB/km so that the PCF can not only do dispersion compensating fiber, and realize low-loss transmission.
Description
Technical field
This utility model is related to a kind of photonic crystal fiber, refers in particular to double-clad photon crystal optical fibre.
Background technology
Photonic crystal fiber (photonic crystal fiber, PCF) also known as micro structure or porous optical fiber, by fibre core and
Its circumferentially-periodic arranges small airport and constitutes.By changing size and the filling rate of airport, flexibly can adjust
Section covering and the relative index of refraction of fibre core, so as to reach the binding effect to light, realize the conduction of light.According to guide-lighting mechanism not
With, photonic crystal fiber can be divided into again Internal Reflection Photonic Crystal Fiber (Total Internal Reflection PCF,
Abbreviation TIR-PCF) and Photonic Bandgap-photonic Crystal Fibers (Photonic Band Gap PCF, abbreviation PBG-PCF).Photon
Crystal optical fibre why be widely used in multi-field in essentially consist in its unique characteristic：Endless single mode, controllable pattern
Area, controllable dispersion characteristics in wider wave-length coverage, and the high non-linearity characteristic as transmission medium etc..Although PCF is based on
Some unique advantages are widely used in each field, but its height loss governs the further development of some applications.
Utility model content
The purpose of this utility model is to provide and a kind of the relatively low dispersion done is lost in λ=1.30～1.80 mu m waveband
Compensated optical fiber.
For reaching above-mentioned purpose, this utility model double-clad photon crystal optical fibre, including fibre core, inner cladding and surrounding layer,
Wherein, optical fiber bulk material is that refractive index is n1=1.44 vitreous silica, fibre core are made up of the airport of a disappearance, interior bag
Layer be made up of the little airport of ground floor, the second layer, surrounding layer is made up of third layer, the 4th layer of air hole, and surrounding layer with interior
Covering angle differs 30 °, the diameter d of inner cladding airport1For 0.5～0.7 μm, the diameter d of surrounding layer airport2For 1.4～
1.6 μm, the pitch lambda in first and second layer of air hole1For 1.3～1.5 μm, the pitch lambda in second and third layer of air hole2For 1.7～1.8 μ
M, the pitch lambda in third and fourth layer of air hole3For 1.9～2.1 μm.
The diameter d of described inner cladding airport1For 0.5, the diameter d of surrounding layer airport2For 1.5 μm, first and second layer
The pitch lambda of airport1For 1.5 μm, the pitch lambda in second and third layer of air hole2For 1.75 μm, the pitch in third and fourth layer of air hole
Λ3For 2 μm.
The hexagonal setting of the covering airport.
After employing such scheme, this utility model PCF is made up of double clad and is primarily due to double-clad structure and not only causes
Coupling difficulty reduces, and with unique dispersion characteristics, is easy to adjust, works as d1When=0.5 μm, designed light can be caused
There is lowest loss at λ=1.55 μm in fibre, up to 7.39 × 10-6DB/km so that the PCF can not only do dispersion compensating fiber, and
And realize low-loss transmission.
Description of the drawings
Fig. 1 is this utility model structural section schematic diagram.
Specific embodiment
By describing technology contents of the present utility model, structural features in detail, realizing purpose and effect, below in conjunction with enforcement
Mode simultaneously coordinates accompanying drawing to be explained in detail.
Refer to Fig. 1, this utility model double-clad photon crystal optical fibre, including fibre core, inner cladding and surrounding layer, wherein,
It is n that optical fiber bulk material is refractive index1=1.44 vitreous silica, fibre core are made up of the airport of a disappearance, and covering is four
The hexagonal airport of layer, inner cladding are made up of the little airport of ground floor, the second layer, surrounding layer by third layer, the 4th layer
Airport is constituted, and surrounding layer differs 30 ° with inner cladding angle, the diameter d of inner cladding airport1For 0.5～0.7 μm, outsourcing
The diameter d in layer of air hole2For 1.4～1.6 μm, the pitch lambda in first and second layer of air hole1For 1.3～1.5 μm, second and third layer of sky
The pitch lambda of pore2For 1.7～1.8 μm, the pitch lambda in third and fourth layer of air hole3For 1.9～2.1 μm.
Using full vector model (Finite Element Method, FEM), photonic crystal fiber each is joined
Number is configured, and has calculated the effective refractive index n of photonic crystal fiber basic modeeff, which is analyzed with this wide at 1.30～1.80 μm
Dispersion and loss characteristic in the range of band.
The total dispersion of photonic crystal fiber is
For propagating wavelength, c is the light velocity in vacuum, n to wherein λeff(λ) it is effective index of fundamental mode, Dm(λ) it is material color
Dissipate.
The loss of one Important Parameters of optical fiber are optical signals when transmitting in optical fiber power.If P0It is the work(of incident optical
Rate, through-put power
pT=p0exp(-αL)
In formula, α is attenuation quotient, commonly referred to fibre loss, and L is the length of optical fiber.
The definition of conventional quartz fibre loss has been continued to use in photonic crystal fiber loss, i.e., optical signal is along fiber-optic transfer time work(
The decay of rate.The decay of different wave length is different, and continuously the loss measurement to different wave length, is called attenuation spectrum measurement.In reality
It is lost in border and generally can be expressed using attenuation quotient：
Designed new double-clad photon crystal optical fibre (double-cladding photonic crystal
Fiber, DC-PCF), as pattern light field is mainly distributed near fibre core, thus from the nearest layer of air hole of fibre core to optical fiber
Transmission characteristic play a major role.Inner cladding air bore dia d in Main Analysis fibre cladding below1, surrounding layer airport straight
Footpath d2With airport pitch (Λ1、Λ2、Λ3) respectively for dispersion and the impact of loss.
Airport based on hexagon is arranged herein, it is proposed that a kind of new double clad PCF structure.Due to this structure
PCF dispersion characteristics are mainly by the airport structures shape of inner core and surrounding, and therefore, inner cladding structure is identical with routine PCF
When, it is possible to achieve similar dispersion characteristics.And the structure of surrounding layer can affect limitation loss, so by the knot for optimizing surrounding layer
Structure carrys out reduce loss.Meanwhile, from total internal reflection theorem, the periodic structure of covering does not almost have for high index of refraction core is guide-lighting
Have an impact, and the PCF with regular texture is difficult to flat dispersion be obtained in broadband, therefore herein by the straight of most inner cladding airport
Footpath reduces to adjust the dispersion characteristics of optical fiber.
By rationally arranging diameter and the airport pitch of the inside and outside covering airports of PCF, the diameter d of inner cladding airport1
For 0.5 μm, the diameter d of surrounding layer airport2For 1.5 μm, the pitch lambda in first and second layer of air hole1For 1.5 μm, second and third layer
The pitch lambda of airport2For 1.75 μm, the pitch lambda in third and fourth layer of air hole3For 2 μm when so that this PCF not only can be realized
Broadband chromatic dispersion compensation and have low-loss characteristic.Numerical result shows that the PCF achieves dispersion at 1.30～1.80 μm
It is in broadband chromatic dispersion compensation effect in wave band, and makes designed optical fiber at λ=1.55 μm, limitation loss is up to 7.39 × 10-6dB/
km.Thus, the design provides reference for the selection based on the device of broadband chromatic dispersion compensation photonic crystal fiber with applying, and this
The low damage characteristic of design can increase the efficiency of transmission of photonic crystal fiber, be in fact existing practical there is provided certain theory according to
According to.
Embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited, every
The equivalent shapes that is made using this utility model description and accompanying drawing content or reconfiguration, or directly or indirectly it is used in other
Related technical field, is included in scope of patent protection of the present utility model in the same manner.
Claims (3)
1. double-clad photon crystal optical fibre, including fibre core, inner cladding and surrounding layer, it is characterised in that：Optical fiber bulk material is folding
Rate is penetrated for n1=1.44 vitreous silica, fibre core are made up of the airport of a disappearance, and covering is four layers of hexagonal air
Hole, inner cladding are made up of the little airport of ground floor, the second layer, and surrounding layer is made up of third layer, the 4th layer of air hole, and outsourcing
Layer differs 30 ° with inner cladding angle, the diameter d of inner cladding airport1For 0.5～0.7 μm, the diameter d of surrounding layer airport2For
1.4～1.6 μm, the pitch lambda in first and second layer of air hole1For 1.3～1.5 μm, the pitch lambda in second and third layer of air hole2For 1.7
～1.8 μm, the pitch lambda in third and fourth layer of air hole3For 1.9～2.1 μm.
2. double-clad photon crystal optical fibre as claimed in claim 1, it is characterised in that：The diameter of described inner cladding airport
d1For 0.5, the diameter d of surrounding layer airport2For 1.5 μm, the pitch lambda in first and second layer of air hole1For 1.5 μm, second and third layer
The pitch lambda of airport2For 1.75 μm, the pitch lambda in third and fourth layer of air hole3For 2 μm.
3. double-clad photon crystal optical fibre as claimed in claim 1, it is characterised in that：The covering airport is hexagonal to be set
Put.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621068731.0U CN206020713U (en) | 2016-09-21 | 2016-09-21 | Double-clad photon crystal optical fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621068731.0U CN206020713U (en) | 2016-09-21 | 2016-09-21 | Double-clad photon crystal optical fibre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206020713U true CN206020713U (en) | 2017-03-15 |
Family
ID=58260710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621068731.0U Expired - Fee Related CN206020713U (en) | 2016-09-21 | 2016-09-21 | Double-clad photon crystal optical fibre |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206020713U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526228A (en) * | 2017-09-25 | 2017-12-29 | 兰州理工大学 | A kind of method that photonic crystal fiber based on doping realizes fast optical transport |
| CN107783348A (en) * | 2017-09-25 | 2018-03-09 | 兰州理工大学 | A kind of method that fast optical transport is realized using special construction photonic crystal fiber |
| CN109581580A (en) * | 2018-12-12 | 2019-04-05 | 桂林电子科技大学 | A kind of fiber bragg grating device based on hollow-core photonic crystal fiber |
| CN112363269A (en) * | 2020-12-11 | 2021-02-12 | 东北石油大学 | High-birefringence low-limiting-loss photonic quasicrystal optical fiber |
-
2016
- 2016-09-21 CN CN201621068731.0U patent/CN206020713U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526228A (en) * | 2017-09-25 | 2017-12-29 | 兰州理工大学 | A kind of method that photonic crystal fiber based on doping realizes fast optical transport |
| CN107783348A (en) * | 2017-09-25 | 2018-03-09 | 兰州理工大学 | A kind of method that fast optical transport is realized using special construction photonic crystal fiber |
| CN109581580A (en) * | 2018-12-12 | 2019-04-05 | 桂林电子科技大学 | A kind of fiber bragg grating device based on hollow-core photonic crystal fiber |
| CN112363269A (en) * | 2020-12-11 | 2021-02-12 | 东北石油大学 | High-birefringence low-limiting-loss photonic quasicrystal optical fiber |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170315 Termination date: 20190921 |