CN110346865A - A kind of polarization maintaining optical fibre that multiband uses - Google Patents
A kind of polarization maintaining optical fibre that multiband uses Download PDFInfo
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- CN110346865A CN110346865A CN201910507960.XA CN201910507960A CN110346865A CN 110346865 A CN110346865 A CN 110346865A CN 201910507960 A CN201910507960 A CN 201910507960A CN 110346865 A CN110346865 A CN 110346865A
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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
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
Abstract
The invention discloses a kind of polarization maintaining optical fibres that multiband uses, it includes the oval germnium doped core layer set gradually from inside to outside, circular ring shape germnium doped core layer, circular ring shape fluorine doped covering and silica clad, and the center of circle of the circular ring shape germnium doped core layer and the circular ring shape fluorine doped covering is overlapped with the center of the oval germnium doped core layer；The refractive index of the ellipse germnium doped core layer is greater than the refractive index of the circular ring shape germnium doped core layer；Along the short-axis direction of the oval germnium doped core layer, the shape of the refractive index profile of the circular ring shape germnium doped core layer includes the parabola shaped and horizontal linear shape arranged and be connected from inside to outside, along the long axis direction of the oval germnium doped core layer, the refractive index profile of the circular ring shape germnium doped core layer is in horizontal linear shape；The cutoff wavelength of the polarization maintaining optical fibre is less than 830nm.The present invention can be suitable for 850nm, 1310nm and 1550nm wavelength, realize the optical fibre gyro coiling of polymorphic type, not only have good anti-bending strength, but also have good welding performance, good decaying and cross-talk stability.
Description
Technical field
The present invention relates to polarization maintaining optical fibre technical fields, and in particular to a kind of polarization maintaining optical fibre that multiband uses.
Background technique
Inertial technology is the key technology of directed navigation, is space flight and aviation and the essential key technology of national defence.
Being compared due to optical fibre gyro with other types gyro has the starting time short, excellent without moving element, strong environmental adaptability etc.
Point develops very fast in recent years, it has also become one of the Main way in inertia field.
The numerous areas such as space flight in recent years, aviation, ship, national defence, high-speed rail, oil well, to high precision gyro and
The technological progress of miniaturization etc. proposes urgent need.Optical fibre gyro based on Sagnac effect using polarization maintaining optical fibre come around
Sensing ring processed.The volume of sensing ring and the length of coiling are to restrict optical fibre gyro mainly to ask to miniaturization with what high-precision developed
Topic, this requires polarization maintaining optical fibre to thinner, more preferable, more reliable development.
The thinning technology of polarization maintaining optical fibre needs to solve thinning, high performance cross-talk stability, environment resistant interference performance
Problem is organically combined with the reliability of prolonged application.Conventional method is generally the diameter for directly reducing optical fiber.But optical fiber is straight
Diameter is smaller, coating is thinner, and then the puzzlement for causing optical fiber external interference resistance to decline, it is difficult to it is higher to be applied to accuracy requirement
Optical fibre gyro.
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, good decaying and excellent extinction ratio.But existing polarization maintaining optical fibre
It there is no the thin footpath type polarization maintaining optical fibre product of the type to support, need to carry out the relevant technologies exploitation.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide one kind can satisfy 850nm, 1310nm
The polarization maintaining optical fibre used with the multiband of 1550nm wavelength not only has good anti-bending strength, but also has good welding
Performance, good decaying and cross-talk stability.
To achieve the above objectives, the technical solution adopted by the present invention is that: a kind of polarization maintaining optical fibre that multiband uses comprising
Oval germnium doped core layer, circular ring shape germnium doped core layer, circular ring shape fluorine doped covering and the silica clad set gradually from inside to outside, the circle
The center of circle of annular germnium doped core layer and the circular ring shape fluorine doped covering is overlapped with the center of the oval germnium doped core layer；
The refractive index of the ellipse germnium doped core layer is greater than the refractive index of the circular ring shape germnium doped core layer；
Along the short-axis direction of the oval germnium doped core layer, the shape of the refractive index profile of the circular ring shape germnium doped core layer includes
The parabola shaped and horizontal linear shape arranged and be connected from inside to outside；
Along the long axis direction of the oval germnium doped core layer, the refractive index profile of the circular ring shape germnium doped core layer is in horizontal linear
Shape；
The cutoff wavelength of the polarization maintaining optical fibre is less than 830nm.
The present invention devises a kind of waveguiding structure of polarization maintaining optical fibre, and due to mixing germanium, relative fefractive index difference is higher, to allow
Smaller cutoff wavelength, so that the cutoff wavelength of polarization maintaining optical fibre is less than 830nm, while to ensure good bending property, in circle
Design has sagging circular ring shape fluorine doped covering around annular germnium doped core layer, realizes the anti-bending strength of optical fiber.
Using oval germnium doped core layer, the transmission mould field of optical fiber can be become oval by the circular mode fields of typical round fibre core
Mould field, in size and geometry, realize that optical fiber mode fields are changed from circular waveguide to elliptical waveguide, in this way the long axis in oval mould field
In short axle, optical fiber transmission path is different, to realize the polarization characteristic of optical fiber.
The present invention is except oval germnium doped core layer, then one of circular ring shape germnium doped core layer is arranged, and along oval germnium doped core layer
The refractive index profile of short-axis direction, circular ring shape germnium doped core layer is parabola shaped with one section, thus in Fusion Joining by circular ring shape
Germnium doped core layer docks conventional circular doped core optical fiber, and then realizes polarisation transfer by oval germnium doped core layer in transmission.So both
Reliability when welding is improved, reduces splice loss, splice attenuation, and improve the cross-talk stability after welding, good polarization is realized and passes
It is defeated.
Further, the circular ring shape germnium doped core layer refractive index is n2, the refractive index of the silica clad is n4, n2With n4
Relative fefractive index difference be Δ n2；
The diameter of the circular ring shape germnium doped core layer is d2；
The long axis of the ellipse germnium doped core layer is d1；
Δn2It is calculated according to following formula:
Wherein, a is the transfer coefficient of the circular ring shape germnium doped core layer, and 1.0%≤a≤2.0%, x are the circular ring shape
Any point and is worked as to the distance at the center of the oval germnium doped core layer on germnium doped core layerWhen, x takes its actual value, whenWhen,
Further, the diameter of the circular ring shape germnium doped core layer is d2, the long axis of the ellipse germnium doped core layer is d1, 1≤
d2/d1≤2。
Further, the silica clad refractive index is n4, the ellipse germnium doped core layer refractive index is n1, n1With n4Phase
Refractive index difference Δ n1Value range be 0.6%~1.2%.
Further, the ovality of the oval germnium doped core layer is 30%~60%.
Further, the silica clad refractive index is n4, the circular ring shape fluorine doped cladding index is n3, n3With n4's
Relative fefractive index difference Δ n3Value range be -0.2%~-0.6%.
Further, the diameter of the circular ring shape fluorine doped covering is d3, the diameter of the circular ring shape germnium doped core layer is d2, 2≤
d3/d2≤6。
Further, it is successively arranged inner coating and external coating from inside to outside on the outside of the silica clad, it is described internally coated
Young's modulus is less than the Young's modulus of the external coating.
Further, the silica clad diameter is d4, the inner coating and the outer coating diameter are respectively d5And d6；
As 39.0 μm≤d4At≤41.0 μm, 52.0 μm≤d5≤ 65.0 μm, 78.0 μm≤d6≤83.0μm；
As 59.0 μm≤d4At≤61.0 μm, 72.0 μm≤d5≤ 85.0 μm, 98.0 μm≤d6≤105.0μm；
As 79.0 μm≤d4At≤81.0 μm, 100.0 μm≤d5≤ 115.0 μm, 134.0 μm≤d6≤ 140.0 μm, or
115.0μm≤d5≤ 135.0 μm, 164.0 μm≤d6≤170.0μm；
As 124.0 μm≤d4At≤126.0 μm, 170.0 μm≤d5≤ 205.0 μm, 235.0 μm≤d6≤250.0μm。
Further, when operation wavelength is 850nm, the polarization maintaining optical fibre decaying is less than 2.0dB/km, and extinction ratio is higher than
20dB/km；When operation wavelength is 1310nm, the polarization maintaining optical fibre decaying is less than 0.36dB/km, and extinction ratio is higher than 24dB/km；Work
When to make wavelength be 1550nm, polarization maintaining optical fibre decaying is less than 0.28dB/km, and extinction ratio is higher than 23dB/km；
The polarization maintaining optical fibre is less than 0.1dB in -55 DEG C~95 DEG C of every kilometer of complete warm attenuation change amount, and full temperature extinction ratio becomes
Change amount is less than 1dB.
Compared with the prior art, the advantages of the present invention are as follows:
The present invention devises a kind of waveguiding structure of polarization maintaining optical fibre, and due to mixing germanium, relative fefractive index difference is higher, to allow
Smaller cutoff wavelength, so that the cutoff wavelength of polarization maintaining optical fibre is less than 830nm, while to ensure good bending property, in circle
Design has sagging circular ring shape fluorine doped covering around annular germnium doped core layer, realizes the anti-bending strength of optical fiber.
Using oval germnium doped core layer, the transmission mould field of optical fiber can be become oval by the circular mode fields of typical round fibre core
Mould field, in size and geometry, realize that optical fiber mode fields are changed from circular waveguide to elliptical waveguide, in this way the long axis in oval mould field
In short axle, optical fiber transmission path is different, to realize the polarization characteristic of optical fiber.
The present invention is except oval germnium doped core layer, then one of circular ring shape germnium doped core layer is arranged, and along oval germnium doped core layer
The refractive index profile of short-axis direction, circular ring shape germnium doped core layer is parabola shaped with one section, thus in Fusion Joining by circular ring shape
Germnium doped core layer docks conventional circular doped core optical fiber, and then realizes polarisation transfer by oval germnium doped core layer in transmission.So both
Reliability when welding is improved, reduces splice loss, splice attenuation, and improve the cross-talk stability after welding, good polarization is realized and passes
It is defeated.
When operation wavelength is 850nm, polarization maintaining optical fibre decaying is less than 2.0dB/km, and extinction ratio is higher than 20dB/km；Operating wave
When a length of 1310nm, polarization maintaining optical fibre decaying is less than 0.36dB/km, and extinction ratio is higher than 24dB/km；When operation wavelength is 1550nm,
Polarization maintaining optical fibre decaying is less than 0.28dB/km, and extinction ratio is higher than 23dB/km；Not only decay and excellent extinction ratio with good,
Polarization maintaining optical fibre is less than 0.1dB in -55 DEG C~95 DEG C of every kilometer of complete warm attenuation change amount, and full temperature extinction ratio variable quantity is less than 1dB.
For bending radius in 5mm, 1550nm additional attenuation is less than 0.2dB, and 1310nm additional attenuation is less than 0.1dB, 850nm
Additional attenuation is less than 0.05dB.
Detailed description of the invention
Fig. 1 is the polarization maintaining optical fibre section structure diagram that multiband provided in an embodiment of the present invention uses；
Fig. 2 is that the polarization maintaining optical fibre waveguiding structure schematic diagram that multiband provided in an embodiment of the present invention uses (mixes germanium along ellipse
The short-axis direction of sandwich layer)；
Fig. 3 is that the polarization maintaining optical fibre waveguiding structure schematic diagram that multiband provided in an embodiment of the present invention uses (mixes germanium along ellipse
The long axis direction of sandwich layer)；
Fig. 4 is oval germnium doped core layer provided in an embodiment of the present invention and circular ring shape germnium doped core layer section structure diagram.
In figure: 1, oval germnium doped core layer；2, circular ring shape germnium doped core layer；3, circular ring shape fluorine doped covering；4, silica clad；5, interior
Coating；6, external coating；
n1, oval germnium doped core layer refractive index；n2, circular ring shape germnium doped core layer refractive index；n3, circular ring shape fluorine doped covering
Refractive index；n4, silica clad refractive index；
d0, oval germnium doped core layer short axle；d1, oval germnium doped core layer long axis；d2, circular ring shape germnium doped core layer diameter；
d3, circular ring shape fluorine doped covering diameter；d4, silica clad diameter；d5, internally coated diameter；d6, external coating diameter.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
Shown in Figure 1, the embodiment of the invention provides a kind of polarization maintaining optical fibre that multiband uses, which includes
Oval germnium doped core layer 1, circular ring shape germnium doped core layer 2, circular ring shape fluorine doped covering 3 and the silica clad 4 set gradually from inside to outside, circle
The center of circle of annular germnium doped core layer 2 and circular ring shape fluorine doped covering 3 is overlapped with the center of oval germnium doped core layer 1；
It is shown in Figure 2, the refractive index n of oval germnium doped core layer 11Greater than the refractive index n of circular ring shape germnium doped core layer 22；
It is shown in Figure 2, along the short-axis direction of oval germnium doped core layer 1, the shape of the refractive index profile of circular ring shape germnium doped core layer 2
Shape includes the parabola shaped and horizontal linear shape arranged and be connected from inside to outside；It is shown in Figure 3, along oval germnium doped core layer 1
Long axis direction, the refractive index profile of circular ring shape germnium doped core layer 2 are in horizontal linear shape；
The present invention devises a kind of waveguiding structure of polarization maintaining optical fibre first, and due to mixing germanium, relative fefractive index difference is higher, thus
Allow smaller cutoff wavelength, so that the cutoff wavelength of polarization maintaining optical fibre is less than 830nm, is suitable for 850nm, 1310nm and 1550nm
Wavelength realizes the optical fibre gyro coiling of polymorphic type, while to ensure good bending property, around circular ring shape germnium doped core layer 2
Design has sagging circular ring shape fluorine doped covering 3, realizes the anti-bending strength of optical fiber；
Using oval germnium doped core layer 1, the transmission mould field of optical fiber can be become ellipse by the circular mode fields of typical round fibre core
Circle mould field, in size and geometry, realize that optical fiber mode fields are changed from circular waveguide to elliptical waveguide, in this way the length in oval mould field
On axis and short axle, optical fiber transmission path is different, to realize the polarization characteristic of optical fiber.
It is inconsistent due to mould field shape when it is with circular core fibre junction but for pure elliptical core optical fiber,
When will lead to both fused fiber splices, the splice loss, splice attenuation at fusing point can be larger.This is also that elliptical core optical fiber is difficult to be widely applied
The major reason of popularization.To solve this problem, the invention except oval germnium doped core layer 1, then one of circle is set
Annular germnium doped core layer 2, and along the short-axis direction of oval germnium doped core layer, the refractive index profile of circular ring shape germnium doped core layer 2 has one section
It is parabola shaped, thus in Fusion Joining by circular ring shape germnium doped core layer 2 dock conventional circular doped core optical fiber, and transmission when then by
Oval germnium doped core layer 1 realizes polarisation transfer.Reliability when welding had both been improved in this way, has reduced splice loss, splice attenuation, and had been improved molten
Cross-talk stability after connecing, realizes good polarisation transfer.
In the present embodiment, when operation wavelength is 850nm, polarization maintaining optical fibre decaying is less than 2.0dB/km, and extinction ratio is higher than
20dB/km；When operation wavelength is 1310nm, polarization maintaining optical fibre decaying is less than 0.36dB/km, and extinction ratio is higher than 24dB/km；Operating wave
When a length of 1550nm, polarization maintaining optical fibre decaying is less than 0.28dB/km, and extinction ratio is higher than 23dB/km；Pass through oval germnium doped core layer 1
Design, the geometry for realizing optical fiber mode fields is asymmetric, to realize excellent extinction ratio, while passing through oval germnium doped core layer 1
In conjunction with the design of circular ring shape germnium doped core layer 2 and circular ring shape fluorine doped covering 3, ensure that under extraneous stress condition, fibre core to the greatest extent may be used
Can uniform stressed, and optical signal can be constrained in fibre core, thus have good decaying and good bending property with
And full warm nature energy.Polarization maintaining optical fibre is less than 0.1dB in -55 DEG C~95 DEG C of every kilometer of complete warm attenuation change amount, and full temperature extinction ratio becomes
Change amount is less than 1dB.
For bending radius in 5mm, 1550nm additional attenuation is less than 0.2dB, and 1310nm additional attenuation is less than 0.1dB, 850nm
Additional attenuation is less than 0.05dB.
It is the waveguiding structure of polarization maintaining optical fibre of the invention shown in referring to figs. 2 and 3, for a kind of " mountain type " waveguiding structure.This
The embodiment that invention provides calculates relative fefractive index difference Δ using following formula:
Δ=(nFolding-n4)/(nFolding+n4) × 100%
Wherein: n4For the refractive index of silica clad 4.For the purpose of the present invention, when the oval germnium doped core layer 1 of calculating and silica clad
4 relative fefractive index difference Δ n1When, n in formulaFoldingFor the refractive index n of oval germnium doped core layer 11；When calculating circular ring shape germnium doped core layer 2
With the relative fefractive index difference Δ n of silica clad 42When, n in formulaFoldingFor the refractive index n of circular ring shape germnium doped core layer 22；When calculating annulus
The relative fefractive index difference Δ n of shape fluorine doped covering 3 and silica clad 43When, n in formulaFoldingBecome the refractive index of circular ring shape fluorine doped covering 3
n3。
2 refractive index of circular ring shape germnium doped core layer is n2, the refractive index of silica clad 4 is n4, n2With n4Relative fefractive index difference be
Δn2；
Shown in Figure 4, the diameter of circular ring shape germnium doped core layer 2 is d2, the long axis of oval germnium doped core layer 1 is d1, ellipse mixes germanium
The short axle of sandwich layer 1 is d0；
Δn2It is calculated according to following formula:
Wherein, a is the transfer coefficient of circular ring shape germnium doped core layer 2, and 1.0%≤a≤2.0%, x are circular ring shape germnium doped core layer
Any point and is worked as to the distance at the center of the oval germnium doped core layer 1 on 2When, x takes its actual value, whenWhen,
For circular ring shape germnium doped core layer 2 by the way of mixing germanium, relative fefractive index difference has one section of smooth parabolic,
Reliability when welding can be improved, reduce splice loss, splice attenuation, and improve the cross-talk stability after welding.
Further, the diameter of circular ring shape germnium doped core layer 2 is d2, the long axis of oval germnium doped core layer 1 is d1, 1≤d2/d1≤
2。
4 refractive index of silica clad is n4, oval 1 refractive index of germnium doped core layer is n1, n1With n4Relative fefractive index difference Δ n1's
Value range is 0.6%~1.2%.
The ovality of oval germnium doped core layer 1 is 30%~60%, i.e., when the minor axis length of oval germnium doped core layer 1 is 3 μm,
Its long axis length d1It is 3.9 μm~4.8 μm.
4 refractive index of silica clad is n4, 3 refractive index of circular ring shape fluorine doped covering is n3, n3With n4Relative fefractive index difference Δ n3
Value range be -0.2%~-0.6%.
The diameter of circular ring shape fluorine doped covering 3 is d3, the diameter of circular ring shape germnium doped core layer 2 is d2, 2≤d3/d2≤6。
Shown in Figure 1,4 outside of silica clad is successively arranged inner coating 5 and external coating 6, the poplar of inner coating 5 from inside to outside
Family name's modulus is less than the Young's modulus of external coating 6, and inner coating 5 is directly contacted with silica clad 4, softer, external coating 6 be then optical fiber most
The protective shell of outer layer, it is harder.Coatings different by two layers of Young's modulus of setting in this way, forms one by harder external coating 6
A protective shell is buffered stress impact by softer inner coating 5, so that optical fiber be made to have good multi-environment application
Energy.
4 diameter of silica clad is d4, inner coating 5 and 6 diameter of external coating are respectively d5And d6；
When the central diameter of silica clad 4 is 40 μm, d4Value range be 39.0 μm≤d4≤ 41.0 μm, and 52.0 μ
m≤d5≤ 65.0 μm, 78.0 μm≤d6≤83.0μm；
When the central diameter of silica clad 4 is 60 μm, d4Value range be 59.0 μm≤d4≤ 61.0 μm, and 72.0 μ
m≤d5≤ 85.0 μm, 98.0 μm≤d6≤105.0μm；
When the central diameter of silica clad 4 is 80 μm, d4Value range be 79.0 μm≤d4≤ 81.0 μm and 100.0 μ
m≤d5≤ 115.0 μm, 134.0 μm≤d6≤ 140.0 μm or 115.0 μm≤d5≤ 135.0 μm, 164.0 μm≤d6≤
170.0μm；
When the central diameter of silica clad 4 is 40 μm, d4Value range be 124.0 μm≤d4≤ 126.0 μm, and
170.0μm≤d5≤ 205.0 μm, 235.0 μm≤d6≤250.0μm。
It can be seen from the above, the diameter of the silica clad 4 of optical fiber covers 40 μm~125 μm, coating diameter covers 80 μm~250
μm, so as to meet the high-precision and miniaturization demand of optical fibre gyro comprehensively.
The present invention is described in more detail below with reference to specific embodiment and attached drawing.
Diameter according to different silica clads 2 is to have carried out the implementation of 16 kinds of optical fiber.Design parameter is shown in Table 1:
Each embodiment design parameter of table 1
Each embodiment main performance of table 2
The polarization maintaining optical fibre that the present invention realizes has good decaying and excellent cross-talk stability, and decaying in 850nm can be small
In 2.0dB/km, extinction ratio is higher than 20dB/km；It is smaller than 0.36dB/km in 1310nm decaying, extinction ratio is higher than 24dB/km；?
1550nm decaying is smaller than 0.28dB/km, and extinction ratio is higher than 23dB/km；In -55 DEG C~95 DEG C of every kilometer of complete warm attenuation change
Amount is less than 0.1dB, and full temperature extinction ratio variable quantity is less than 1dB；Welding with good welding performance, with conventional circular optical fiber
Loss can reach within 0.3dB；For bending radius in 5mm, 1550nm additional attenuation is less than 0.2dB, and 1310nm additional attenuation is small
In 0.1dB, 850nm additional attenuation is less than 0.05dB.
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 protection of the invention
Within the scope of.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 polarization maintaining optical fibre that multiband uses, it is characterised in that: it includes the oval germnium doped core set gradually from inside to outside
Layer (1), circular ring shape germnium doped core layer (2), circular ring shape fluorine doped covering (3) and silica clad (4), the circular ring shape germnium doped core layer (2)
It is overlapped with the center of circle of the circular ring shape fluorine doped covering (3) with the center of the oval germnium doped core layer (1)；
The refractive index of the ellipse germnium doped core layer (1) is greater than the refractive index of the circular ring shape germnium doped core layer (2)；
Along the short-axis direction of the oval germnium doped core layer (1), the shape packet of the refractive index profile of the circular ring shape germnium doped core layer (2)
Include the parabola shaped and horizontal linear shape arranged and be connected from inside to outside；
Along the long axis direction of the oval germnium doped core layer (1), the refractive index profile of the circular ring shape germnium doped core layer (2) is in horizontal straight
It is linear；
The cutoff wavelength of the polarization maintaining optical fibre is less than 830nm.
2. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that:
Circular ring shape germnium doped core layer (2) refractive index is n2, the refractive index of the silica clad (4) is n4, n2With n4Opposite folding
Penetrating rate difference is Δ n2；
The long axis of the ellipse germnium doped core layer (1) is d1；
Δn2It is calculated according to following formula:
Wherein, a is the transfer coefficient of the circular ring shape germnium doped core layer (2), and 1.0%≤a≤2.0%, x are that the circular ring shape is mixed
Any point and is worked as to the distance at the center of the oval germnium doped core layer (1) on germanium sandwich layer (2)When, x takes its reality
Value, whenWhen,
3. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that: the circular ring shape germnium doped core layer (2)
Diameter be d2, the long axis of the ellipse germnium doped core layer (1) is d1, 1≤d2/d1≤2。
4. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that: silica clad (4) refractive index
For n4, ellipse germnium doped core layer (1) refractive index is n1, n1With n4Relative fefractive index difference Δ n1Value range be 0.6%~
1.2%.
5. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that: the ellipse germnium doped core layer (1)
Ovality is 30%~60%.
6. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that: silica clad (4) refractive index
For n4, circular ring shape fluorine doped covering (3) refractive index is n3, n3With n4Relative fefractive index difference Δ n3Value range be -0.2%
~-0.6%.
7. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that: the circular ring shape fluorine doped covering (3)
Diameter be d3, the diameter of the circular ring shape germnium doped core layer (2) is d2, 2≤d3/d2≤6。
8. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that:
It is successively arranged inner coating (5) and external coating (6), the poplar of the inner coating (5) from inside to outside on the outside of the silica clad (4)
Family name's modulus is less than the Young's modulus of the external coating (6).
9. panda type polarization-preserving fiber as described in claim 1, it is characterised in that:
Silica clad (4) diameter is d4, the inner coating (5) and the external coating (6) diameter are respectively d5And d6；
As 39.0 μm≤d4At≤41.0 μm, 52.0 μm≤d5≤ 65.0 μm, 78.0 μm≤d6≤83.0μm；
As 59.0 μm≤d4At≤61.0 μm, 72.0 μm≤d5≤ 85.0 μm, 98.0 μm≤d6≤105.0μm；
As 79.0 μm≤d4At≤81.0 μm, 100.0 μm≤d5≤ 115.0 μm, 134.0 μm≤d6≤ 140.0 μm or 115.0
μm≤d5≤ 135.0 μm, 164.0 μm≤d6≤170.0μm；
As 124.0 μm≤d4At≤126.0 μm, 170.0 μm≤d5≤ 205.0 μm, 235.0 μm≤d6≤250.0μm。
10. the polarization maintaining optical fibre that multiband as described in claim 1 uses, it is characterised in that:
When operation wavelength is 850nm, the polarization maintaining optical fibre decaying is less than 2.0dB/km, and extinction ratio is higher than 20dB/km；Operation wavelength
When for 1310nm, the polarization maintaining optical fibre decaying is less than 0.36dB/km, and extinction ratio is higher than 24dB/km；Operation wavelength is 1550nm
When, the polarization maintaining optical fibre decaying is less than 0.28dB/km, and extinction ratio is higher than 23dB/km；
The polarization maintaining optical fibre is less than 0.1dB, full temperature extinction ratio variable quantity in -55 DEG C~95 DEG C of every kilometer of complete warm attenuation change amount
Less than 1dB.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910507960.XA CN110346865B (en) | 2019-06-12 | 2019-06-12 | Polarization maintaining optical fiber used in multiple bands |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910507960.XA CN110346865B (en) | 2019-06-12 | 2019-06-12 | Polarization maintaining optical fiber used in multiple bands |
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| Publication Number | Publication Date |
|---|---|
| CN110346865A true CN110346865A (en) | 2019-10-18 |
| CN110346865B CN110346865B (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113740958A (en) * | 2021-08-27 | 2021-12-03 | 烽火通信科技股份有限公司 | High-mode-number and weak-coupling few-mode optical fiber |
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