CN110244405A - A kind of multiband bow-tie type polarization maintaining optical fibre - Google Patents
A kind of multiband bow-tie type polarization maintaining optical fibre Download PDFInfo
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- CN110244405A CN110244405A CN201910527457.0A CN201910527457A CN110244405A CN 110244405 A CN110244405 A CN 110244405A CN 201910527457 A CN201910527457 A CN 201910527457A CN 110244405 A CN110244405 A CN 110244405A
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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
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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
- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
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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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
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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
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Abstract
The invention discloses a kind of multiband bow-tie type polarization maintaining optical fibres, are related to polarization maintaining optical fibre field.The optical fiber includes quartzy area, and the inside in quartzy area is equipped with circular core area and 2 stressed zones；Central symmetry of 2 stressed zones along core area is distributed；Core area successively includes using the center in core area as first sandwich layer in the center of circle, the second sandwich layer and quartz transition floor from the inside to the outside；Relative fefractive index difference Δ of first sandwich layer relative to quartzy area11It is 0.5%~1.1%；Relative fefractive index difference Δ of second sandwich layer relative to quartzy area12It is -0.5%~-0.05%；The refractive index n of quartz transition layer14With the refractive index n in quartzy area16It is equal；The refractive index n of stressed zone2Decline from the area Chu Zhiyuanxin, the area Jin Xin in logarithmic curve.Fiber cut off wavelength provided by the invention is less than 850nm, can meet user and research and develop demand to the optical fibre gyro of 850nm wave band, while the optical fiber has both good Decay Rate and cross-talk stability.
Description
Technical field
The invention belongs to polarization maintaining optical fibre fields, and in particular to a kind of multiband bow-tie type polarization maintaining optical fibre.
Background technique
Optical fibre gyro be sensory field of optic fibre it is most important achievement one of, have small in size, light-weight, electromagnetism interference,
Dynamic range is big, movement-less part, without wearing terrain, structure flexible design and many advantages, such as have a wide range of application, in aviation, boat
It, the civil fields such as military domains and geology, oil exploration such as navigation and weapons there is vast potential for future development.
The technical foundation of optical fibre gyro is high-precision relevant detection and optical fiber sensing technology, the stability of output signal
Stability depending on the relevant polarization state of two beams in optical fiber.In last century the eighties, Shupe D M is proposed, when optical fiber top
One section of optical fiber is there are when time varying temperature disturbance in solenoid, unless this section of optical fiber is located at thiol, otherwise due to two beam reversals
Wave travels pass through this section of optical fiber in different time, and different phase shifts will be undergone because of thermal perturbation, as non-caused by temperature
Reciprocal phase shift.This effect is the Shupe error in optical fibre gyro.Existing common method is by level Four symmetrical ring coiling
Fiber optic loop makes adjacent two pairs symmetrical optical fiber layer sequences on the contrary, to compensate radial temperature field gradient.This method is to optical fibre gyro
In Shupe error play very effective inhibitory effect, but be limited to process equipment, fiber optic loop coiling state still can not
Accomplish complete symmetrical.This is caused in high-precision optical fibre gyro application, and residual temperature drift still be can not ignore.Therefore,
To promote optical fiber gyroscope precision, the Shupe error of optical fiber loop is reduced, the reduction of optical fiber outer dimension is to solve the problems, such as this
Developing direction.After optical fiber attenuates, the overall dimensions of optical fiber loop decline, and such ring is influenced bring by temperature gradient
Shupe error is obtained with more significant improvement.
As optical fibre gyro is developed to miniaturization, pervious 1310nm and 1550nm is compared, is needed using 850nm etc.
Wavelength reduces ring volume while keeping precision.But existing polarization maintaining optical fibre there is no the thin footpath polarization maintaining optical fibre product of the type
Support, therefore, presently, there are the problem of be to be badly in need of researching and developing a kind of can satisfy user and grinding the optical fibre gyro of 850nm wave band
The multiband bow-tie type polarization maintaining optical fibre of hair demand.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of multiband bow-tie type polarization-maintaining light
It is fine.The optical fiber is less than 850nm by wavelength, can be used for the multiband polarization maintaining optical fibre comprising 850nm, 1310nm and 1550nm
It develops, while the optical fiber has both good Decay Rate and cross-talk stability, and can satisfy thin footpath requirement.
To achieve the above objectives, the present invention provides a kind of multiband bow-tie type polarization maintaining optical fibres comprising quartzy area, it is described
The inside in quartzy area is equipped with circular core area and 2 stressed zones；Central symmetry of 2 stressed zones along the core area is distributed；The core
Area successively includes using the center in the core area as first sandwich layer in the center of circle, the second sandwich layer and quartz transition floor from the inside to the outside；
Relative fefractive index difference Δ of first sandwich layer relative to the quartzy area11It is 0.5%~1.1%；Described second
Relative fefractive index difference Δ of the sandwich layer relative to the quartzy area12It is -0.5%~-0.05%；The refractive index of the quartz transition layer
n13With the refractive index n in the quartzy area3It is equal；The refractive index n of the stressed zone2It is bent in logarithm from the area Chu Zhiyuanxin, the area Jin Xin
Line decline；
The cutoff wavelength of the multiband bow-tie type polarization maintaining optical fibre is less than 850nm.
Based on the above technical solution, the calculation formula of the relative fefractive index difference are as follows: Δ=(n-n0)/(n+
n0) 100%；
Wherein, Δ is relative fefractive index difference, n0For the refractive index in quartzy area；
When relative fefractive index difference Δ of the first sandwich layer of calculating relative to quartzy area11When, in above-mentioned formula, n is the first sandwich layer
Refractive index n11；When relative fefractive index difference Δ of the second sandwich layer of calculating relative to quartzy area12When, in above-mentioned formula, n second
The refractive index n of sandwich layer12。
Based on the above technical solution, relative fefractive index difference Δ of the stressed zone relative to the quartzy area2's
Calculation formula are as follows: Δ2=a0lg(x2)；
Wherein, a0For stress gradual change coefficient, -0.2≤a0≤-0.1；
X is that any point is located at the point of core area (1) radially into the nearly core area edge of stressed zone (2) in stressed zone (2)
The distance between, 1 μm≤x≤xmax, and 10 μm≤xmax≤20μm。
Based on the above technical solution, the stressed zone is in linear type bow-tie type or bowtie type structure.
Based on the above technical solution, when the stressed zone be in linear type bow-tie type structure when, the stressed zone with
The core district's groups are at an ellipse.
Based on the above technical solution, when the stressed zone is in bowtie type structure, the shape of the stressed zone
Shape is using the center in the core area as the circular arc in center of circle ring-type, and the central angle a of the circular arc ring is 30~60 °.
Based on the above technical solution, the diameter d in the quartzy area3It is 39~126 μm.
It based on the above technical solution, further include inner coating and external coating outside the quartzy area；In described
The Young's modulus of coating is 0.5-2.5MPa；The Young's modulus of the external coating is 500-2500MPa.
Based on the above technical solution, the internally coated diameter d4It is 52~205 μm；The diameter of the external coating
d5It is 78~250 μm.
Based on the above technical solution, first sandwich layer is formed by the way of mixing germanium；Second sandwich layer is adopted
It is formed with the mode of fluorine doped；The stressed zone is formed by the way of mixing diboron trioxide.
Compared with the prior art, the advantages of the present invention are as follows:
(1) cutoff wavelength of multiband bow-tie type polarization maintaining optical fibre provided by the invention be less than 850nm, can be used for include
The optical fibre gyro coiling of polymorphic type may be implemented in the development of the multiband polarization maintaining optical fibre of 850nm, 1310nm and 1550nm.
(2) multiband bow-tie type polarization maintaining optical fibre provided by the invention has good Decay Rate and cross-talk stability,
850nm decaying is in 2.0dB/km hereinafter, extinction ratio is in 21dB/km or more；It is less than 0.38dB/km, extinction ratio in 1310nm decaying
Higher than 30dB/km；It is less than 0.3dB/km in 1550nm decaying, extinction ratio is in 25dB/km or more；The full temperature decaying of every kilometer of 1550nm
Variable quantity in 0.2dB hereinafter, 1550nm entirely warm extinction ratio variable quantity in 1.5dB or less.
(3) multiband bow-tie type polarization maintaining optical fibre provided by the invention can provide optical fiber quartz area (also referred to as " optical fiber quartz
Covering ") diameter cover 39~126 μm, coating diameter cover 78~250 μm of all types of thin footpath polarization maintaining optical fibres.
Detailed description of the invention
Fig. 1 shows the end structure illustration of the multiband linear type bow-tie type polarization maintaining optical fibre in the embodiment of the present invention.
Fig. 2 shows the end structure illustrations of the multiband bowtie type polarization maintaining optical fibre in the embodiment of the present invention.
Fig. 3 shows the waveguiding structure schematic diagram of multiband bow-tie type polarization maintaining optical fibre in the embodiment of the present invention.
Fig. 4 shows the coating structure schematic diagram of the multiband linear type bow-tie type polarization maintaining optical fibre in the embodiment of the present invention.
In figure, identical component is used the same reference numerals to represent, and the meaning of appended drawing reference is as follows: 1- core area；2- is answered
Power area；3- quartz area；4- inner coating；5- external coating；The first sandwich layer of 11-；The second sandwich layer of 12-；13- quartz transition layer；n11- the first
The refractive index of sandwich layer；n12The refractive index of-the second sandwich layer；n13The refractive index of quartz transition layer；n2The refractive index of stressed zone；n3-
The refractive index in quartzy area；d11- the first sandwich layer diameter；d3Quartzy area diameter；d4Inner coating diameter；d5Outer coating diameter.
Specific embodiment
To keep the present invention easier to understand, below in conjunction with drawings and the specific embodiments, the present invention will be described in detail.It should
Understand, these embodiments only serve illustrative, are not intended to limit the present invention.
As previously mentioned, there is no the polarization maintaining optical fibre of covering 850nm wave band in the prior art.The present inventor is in polarization-maintaining light
Fine field is found by a large amount of experimental study, by the way that the first sandwich layer in fiber cores plot structure is designed as step change type waveguide junction
Structure keeps its relative fefractive index difference higher, and smaller optical fiber can be allowed by wavelength.After fibre diameter attenuates, stressed zone by
Extraneous stress interference effect is larger, to make optical fiber attenuation performance and cross-talk bad stability.Therefore, present invention optimizes stress
The structure in area can effectively reduce the size of stressed zone and the stress intensity of stressed zone itself, become to interfere in extraneous stress
When big, reduce stressed zone is influenced by extraneous stress interference, guarantees the cross-talk stability and fade performance of optical fiber.Specifically,
The present invention designs around the first sandwich layer the second sandwich layer and quartz transition layer, can solve lesser in the quartzy area of optical fiber
In the case of, the optical fiber attenuation that the ratio for accounting for entire quartzy area due to stressed zone may cause when bigger than normal problem bigger than normal.In addition,
Two stressed zones are symmetrical arranged around fiber cores area centered on core area, being formed, there is linear type bow-tie type or string tie type to answer
Power plot structure, and the refractive index of stressed zone declines from the area Chu Zhiyuanxin, the area Jin Xin in logarithmic curve, can optical fiber be had
Good cross-talk stability.The present invention is based on what above-mentioned discovery was made.
Referring to Fig. 1 and Fig. 2, embodiments of the present invention provide a kind of multiband bow-tie type polarization maintaining optical fibre.The optical fiber
Cutoff wavelength is less than 850nm.
The optical fiber includes circular quartz area 3, and the inside in quartzy area 3 is equipped with circular core area 1 and 2 stressed zone 2；2 stress
Central symmetry of the area 2 along core area 1 is distributed.Core area 1 successively includes the first sandwich layer using the center in core area 1 as the center of circle from the inside to the outside
11, the second sandwich layer 12 and quartz transition layer 13.The diameter d of first sandwich layer 1111It is 3.5~10 μm.The diameter d of second sandwich layer 1212
It is 3.6~10.6 μm.The diameter d of quartz transition layer 1313It is 3.8~11.0 μm.
Referring to Fig. 3, the waveguiding structure in core area 1 is " knife axe shape " waveguide.
Specifically, the first sandwich layer 11 is formed by the way of mixing germanium, has step change type waveguiding structure, the folding of the first sandwich layer 11
Penetrate rate n11The refractive index n in more quartzy area 33It is high.Preferably, relative fefractive index difference Δ of first sandwich layer 11 relative to quartzy area 311For
0.5%~1.1%.
It is inclined in order to solve the ratio for accounting for entire quartzy area 3 due to stressed zone 2 in the 3 lesser situation of diameter of optical fiber quartz area
The decaying problem bigger than normal that may cause when big is equipped with the second sandwich layer 12 (also referred to as " sagging covering ") around the first sandwich layer 11
With transition covering 13.
Second sandwich layer 12 is formed by the way of fluorine doped, the refractive index n of the second sandwich layer 1212The refractive index n in more quartzy area 33
It is low.Preferably, relative fefractive index difference Δ of second sandwich layer 12 relative to quartzy area 312It is -0.5%~-0.05%.
The refractive index n of quartz transition layer 1313With the refractive index n in quartzy area 33It is equal.
The calculation formula of the relative fefractive index difference of first sandwich layer 11 and the second sandwich layer 12 in the present invention are as follows: Δ=(n-n0)/
(n+n0) 100%；Wherein, Δ is relative fefractive index difference, n0For the refractive index in quartzy area 3.Therefore, when the first sandwich layer 11 of calculating
Relative fefractive index difference Δ relative to quartzy area 311When, in above-mentioned formula, n is the refractive index n of the first sandwich layer11；When calculating second
Relative fefractive index difference Δ of the sandwich layer 12 relative to quartzy area 312When, in above-mentioned formula, n is the refractive index n of the second sandwich layer12。
Cross-talk in order to solve the problems, such as the optical fiber under special cutoff wavelength is unstable, the week in the area Zhong Xin 1 of the present invention
Enclose the stressed zone 2 that the central symmetry equipped with 2 areas Ge Yanxin 1 is distributed.Stressed zone 2 is formed by the way of mixing diboron trioxide,
Refractive index n2Decline from the area Chu Zhiyuanxin, the area Jin Xin in logarithmic curve.By the design of the particular waveguide structure of stressed zone 2, make
Fiber end face in grinding, when stressed zone region end surface grinding, is also equipped with higher stress while slight crack does not occur
(i.e. higher extinction ratio), it is possible thereby to realize the good cross-talk stability of optical fiber.
Preferably, relative fefractive index difference Δ of the stressed zone 2 relative to quartzy area 3 in the present invention2Calculation formula are as follows: Δ2=
a0lg(x2)；Wherein, wherein a0For stress gradual change coefficient, -0.2≤a0≤-0.1；X is any point in stressed zone 2 to stress
It is located at the distance between the point of core area 1 radially, 1≤x≤x in the nearly core area edge in area 2max(x is 1 to xmaxSuccessive value)；1
μm≤x≤xmax, and 10 μm≤xmax≤20μm。
Referring to Fig. 1, stressed zone 2 is in linear type bow-tie type structure.At this point, 2 stressed zones 2 are similar with the composition one of core area 1
The ellipse of " eye shape ".Core area 1 is located at elliptical center, and two stressed zones 2 are then that elliptical region is right in addition to circular core area 1
Claim two regions of distribution, shape is like linear type knot.Stressed zone 2 and core area 1 form " blade " waveguiding structure.
Referring to fig. 2, stressed zone 2 is in bowtie type structure.At this point, the shape of 2 stressed zones is to be with the center in core area 1
The circular arc in the center of circle is cyclic annular, and shape is like the string tie centered on circular core area 1.The central angle a of the circular arc ring be 30~
It 60 °, so can be preferably by stress to act on core area to this in a preferable transform angle set, to allow core area by more right
The stress of title realizes symmetrical bigger stress in core area simultaneously also by this mode by smaller stressed zone.Equally
Ground, when stressed zone 2 is in bowtie type structure, stressed zone 2 and core area 1 also form " blade " waveguiding structure.
It is equal compared with there is the optical fiber in linear type bow-tie type structure with the optical fiber in bowtie type stressed zone structure
Extinction ratio with higher, but be in linear type bow-tie type structure compared with having with the optical fiber in bowtie type stressed zone structure
The full warm nature of the extinction ratio of optical fiber can be more excellent, therefore, has comprehensive cross-talk with the optical fiber in bowtie type stressed zone structure
The more preferable advantage of energy.
In practical applications, in addition to needing to consider asking for optical fiber attenuation and cross-talk stability under special cutoff wavelength
Topic, while also to meet the requirement of thin footpath.That is, in the case where guaranteeing good optical fiber attenuation performance and cross-talk stability, to the greatest extent
Amount reduces the diameter of optical fiber.
In the present invention, the diameter d in preferably quartzy area 33It is 39~126 μm.Referring to fig. 4, optical fiber of the invention can also wrap
Include the inner coating 4 being set to outside quartzy area 3 and external coating 5.The Young's modulus of inner coating 4 is 0.5-2.5MPa；The Young of external coating 5
Modulus is 500-2500MPa.Preferably, the diameter d of inner coating 44It is 52~205 μm；The diameter d of external coating 55For 78~250 μ
m.The present invention can provide optical fiber quartz area (also referred to as " optical fiber silica clad ") diameter and cover 39~126 μm as a result, and coating is straight
Diameter covers 78~250 μm of all types of thin footpath polarization maintaining optical fibres.
Specifically, for the thin footpath requirement of polarization maintaining optical fibre, while meeting simultaneous between stressed zone size and optical fiber quartz area diameter
Appearance relationship and painting interlayer matching relationship, present invention preferably provides the optical fiber of following several diameters.
As the diameter d in the quartzy area of optical fiber3When being 39.0~41.0 μm, the diameter d of corresponding inner coating 44It is 52.0~65.0
μm, the diameter d of corresponding external coating 55It is 78.0~83.0 μm.
As the diameter d in the quartzy area of optical fiber3When being 59.0~61.0 μm, the diameter d of corresponding inner coating 44It is 72.0~85.0
μm, the diameter d of corresponding external coating 55It is 98.0~105.0 μm.
As the diameter d in the quartzy area of optical fiber3When being 79.0~81.0 μm, the diameter d of corresponding inner coating 44For 100.0~
135.0 μm, the diameter d of corresponding external coating 55It is 134.0~170.0 μm.
As the diameter d in the quartzy area of optical fiber3When being 124.0~126.0 μm, the diameter d of corresponding inner coating 44For 170.0~
205.0 μm, the diameter d of corresponding external coating 55It is 235.0~250.0 μm.
The present invention is described in more detail below with reference to specific embodiment and attached drawing.
Tables 1 and 2 respectively illustrates the structure of the multiband linear type bow-tie type polarization maintaining optical fibre of 1-16 of the embodiment of the present invention
Parameter and performance parameter.
The structural parameters of the multiband linear type bow-tie type polarization maintaining optical fibre of 1 embodiment 1-16 of table
The performance parameter of the multiband linear type bow-tie type polarization maintaining optical fibre of 2 embodiment 1-16 of table
(note: full temperature refers to temperature range in table are as follows: -55 DEG C~90 DEG C)
Table 3 and table 4 show the structure and performance of the multiband bowtie type polarization maintaining optical fibre of 17-32 of the embodiment of the present invention
Parameter.
The structural parameters of the multiband bowtie type polarization maintaining optical fibre of 3 embodiment 17-32 of table
The performance parameter of the multiband bowtie type polarization maintaining optical fibre of 4 embodiment 17-32 of table
(note: full temperature refers to temperature range in table are as follows: -55 DEG C~90 DEG C)
It can be seen that multiband bow-tie type polarization maintaining optical fibre of the invention from the data of above-described embodiment to exist in 850nm decaying
2.0dB/km hereinafter, extinction ratio in 21dB/km or more；It is less than 0.38dB/km in 1310nm decaying, extinction ratio is higher than 30dB/km；
It is less than 0.3dB/km in 1550nm decaying, extinction ratio is in 25dB/km or more；Warm attenuation change amount exists every kilometer of 1550nm entirely
0.2dB hereinafter, 1550nm entirely warm extinction ratio variable quantity in 1.5dB or less.The present invention can provide optical fiber quartz area (also referred to as
" optical fiber silica clad ") diameter covers 39~126 μm, and coating diameter covers 78~250 μm of all types of thin footpath polarization maintaining optical fibres.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as in guarantor of the invention
Within the scope of shield.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of multiband bow-tie type polarization maintaining optical fibre comprising the inside of quartzy area (3), the quartz area (3) is equipped with circular core
Area (1) and 2 stressed zones (2)；2 stressed zones (2) are distributed along the central symmetry of the core area (1)；The core area (1) by it is interior extremely
It successively include outside using the center of the core area (1) as first sandwich layer (11) in the center of circle, the second sandwich layer (12) and quartz transition floor
(13)；
Relative fefractive index difference Δ of first sandwich layer (11) relative to the quartzy area (3)11It is 0.5%~1.1%；Described
Relative fefractive index difference Δ of two sandwich layers (12) relative to the quartzy area (3)12It is -0.5%~-0.05%；The quartz transition
The refractive index n of layer (13)13With the refractive index n of the quartzy area (3)3It is equal；The refractive index n of the stressed zone (2)2From the area Jin Xin
Decline at the area Chu Zhiyuanxin in logarithmic curve；
The cutoff wavelength of the multiband bow-tie type polarization maintaining optical fibre is less than 850nm.
2. multiband bow-tie type polarization maintaining optical fibre according to claim 1, which is characterized in that the meter of the relative fefractive index difference
Calculate formula are as follows: Δ=(n-n0)/(n+n0) 100%；
Wherein, Δ is relative fefractive index difference, n0For the refractive index of quartzy area (3)；
When the relative fefractive index difference Δ of calculating the first sandwich layer (11) relative to quartzy area (3)11When, in above-mentioned formula, n is the first core
The refractive index n of layer11；When the relative fefractive index difference Δ of calculating the second sandwich layer (12) relative to quartzy area (3)12When, above-mentioned formula
In, n is the refractive index n of the second sandwich layer12。
3. multiband bow-tie type polarization maintaining optical fibre according to claim 1, which is characterized in that the stressed zone (2) relative to
The relative fefractive index difference Δ of the quartz area (3)2Calculation formula are as follows: Δ2=a0lg(x2)；
Wherein, a0For stress gradual change coefficient, -0.2≤a0≤-0.1；
X be stressed zone (2) in any point into the nearly core area edge of stressed zone (2) between the point of core area (1) radially
Distance, 1 μm≤x≤xmax, and 10 μm≤xmax≤20μm。
4. multiband bow-tie type polarization maintaining optical fibre according to claim 1, which is characterized in that the stressed zone (2) is in a word
Shape bow-tie type or bowtie type structure.
5. multiband bow-tie type polarization maintaining optical fibre according to claim 4, which is characterized in that when the stressed zone (2) are in one
When font bow-tie type structure, the stressed zone (2) and the core area (1) form an ellipse.
6. multiband bow-tie type polarization maintaining optical fibre according to claim 4, which is characterized in that when the stressed zone (2) are in butterfly
When shape bow-tie type structure, the shape of the stressed zone (2) is described to be cyclic annular by the circular arc in the center of circle of the center of the core area (11)
The central angle a of circular arc ring is 30~60 °.
7. multiband bow-tie type polarization maintaining optical fibre according to claim 1, which is characterized in that the diameter d of the quartz area (3)3
It is 39~126 μm.
8. multiband bow-tie type polarization maintaining optical fibre according to any one of claims 1-7, which is characterized in that further include setting
In the outer inner coating (4) of the quartzy area (3) and external coating (5)；The Young's modulus of the inner coating (4) is 0.5-2.5MPa；
The Young's modulus of the external coating (5) is 500-2500MPa.
9. multiband bow-tie type polarization maintaining optical fibre according to claim 8, which is characterized in that the diameter d of the inner coating (4)4
It is 52~205 μm；The diameter d of the external coating (5)5It is 78~250 μm.
10. multiband bow-tie type polarization maintaining optical fibre according to any one of claims 1-7, which is characterized in that described
One sandwich layer (11) is formed by the way of mixing germanium；Second sandwich layer (12) is formed by the way of fluorine doped；The stressed zone (2)
It is formed by the way of mixing diboron trioxide.
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| CN112596151A (en) * | 2020-11-24 | 2021-04-02 | 法尔胜泓昇集团有限公司 | Erbium-doped polarization-maintaining active optical fiber and preparation method thereof |
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| CN112596151A (en) * | 2020-11-24 | 2021-04-02 | 法尔胜泓昇集团有限公司 | Erbium-doped polarization-maintaining active optical fiber and preparation method thereof |
| CN112596151B (en) * | 2020-11-24 | 2022-11-04 | 江苏法尔胜光电科技有限公司 | Erbium-doped polarization-maintaining active optical fiber and preparation method thereof |
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| CN110244405B (en) | 2020-07-07 |
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