CN208239660U - A kind of more covering bending loss insensitive single-mode fibers - Google Patents
A kind of more covering bending loss insensitive single-mode fibers Download PDFInfo
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- CN208239660U CN208239660U CN201820895166.8U CN201820895166U CN208239660U CN 208239660 U CN208239660 U CN 208239660U CN 201820895166 U CN201820895166 U CN 201820895166U CN 208239660 U CN208239660 U CN 208239660U
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Abstract
The utility model discloses a kind of more covering bending loss insensitive single-mode fibers, including sandwich layer and covering, the concave shape distribution high in the low outside in center of the refractive index of sandwich layer, it is successively inner cladding, sagging covering and surrounding layer from inside to outside that the covering outside sandwich layer, which is arranged in, the refractive index of sandwich layer is higher than the refractive index of inner cladding, sink covering and surrounding layer, the refractive index of the inner cladding gradually decreases from inside to outside along radial, the covering that sink is fluorine doped layer, and the refractive index for the covering that sink is lower than inner cladding and surrounding layer.The refractive index profile structure that the utility model passes through optimization optical fiber, making optical fiber not only has lower bending added losses, and there is stable mechanical performance and uniform material to form, keep effective mode field diameter and bending property, the thickness of the sagging covering of reduction and sagging depth, to effectively reduce fluorine doped amount, technique controlling difficulty and manufacturing cost are reduced.
Description
Technical field
The utility model relates to be used for technical field of optical fiber more particularly to a kind of more insensitive single-mode optics of covering bending loss
It is fine.
Background technique
Gradually popularized with fiber-to-the-home, bend insensitive fiber is receive more and more attention, according to whether with
G.652 G.657 the compatible principle of optical fiber will be divided into A major class and the big type optical fiber of B by optical fiber, while according to minimum flexible half
Bending grade is divided into 1,2,3 three grades by the principle of diameter, wherein 1 corresponding 10mm minimum bending radius, 2 corresponding 7.5mm are minimum
Bending radius, 3 corresponding 5mm minimum bending radius.In conjunction with the two principles, G.657 four subclasses will be divided by optical fiber,
G.657.A1, G.657.A2, G.657.B2 and G.657.B3 optical fiber.Bending loss insensitive single-mode fiber can effectively inhibit by
The additional attenuation caused by the macrobending loss of long wavelength region, not only supports the transmission application of L-band, while being easy in such as optical fiber
Wiring installation is carried out in the small sizes optical device such as splice tray, the light device of the lesser optical cable of bending radius and small size can be fully met
Specific demand of the part for bending property.
Existing 4 layers of structural bending loss insensitive single-mode fiber with the surrounding layer that sink is obtaining standard compliant mould field
In the case where the parameters such as diameter, cutoff wavelength, refractive index profile structure needs very low sagging cladding index curved to control
Song loss, it is larger so as to cause fluorine doped amount, technique controlling difficulty is increased, manufacturing cost is high.
Utility model content
Technical problem to be solved in the utility model and the technical assignment of proposition are improved to the prior art, are provided
A kind of more covering bending loss insensitive single-mode fibers, solve the refraction of the bending loss insensitive single-mode fiber in current technology
Rate cross-section structure needs very low sagging cladding refractive index, and fluorine doped amount is big, and technique controlling difficulty is big, and cost of manufacture is high to ask
Topic.
In order to make it easy to understand, being defined as follows term:
Refractive index profile: the relationship between optical fiber or preform (including plug) glass refraction and its radius；
Relative index of refraction difference: Δ i=(ni-n0)/n0, ni correspond to the refractive index of optical fiber each section, and n0 is pure titanium dioxide
Silica glass refractive index.
In order to solve the above technical problems, the technical solution of the utility model is:
A kind of more covering bending loss insensitive single-mode fibers, including sandwich layer and covering, which is characterized in that the sandwich layer
Refractive index in the low outside in center it is high concave shape distribution, be arranged in the covering outside sandwich layer be successively from inside to outside inner cladding, under
Covering and surrounding layer are fallen into, the refractive index of the sandwich layer is higher than the refractive index of inner cladding, sink covering and surrounding layer, the inner cladding
Refractive index gradually decreased from inside to outside along radial, the covering that sink is fluorine doped layer, and the refractive index for the covering that sink is lower than inner cladding
And surrounding layer.The refractive index profile that more covering bending loss insensitive single-mode fibers described in the utility model pass through optimization optical fiber
Structure, making optical fiber not only has lower bending added losses, but also there is stable mechanical performance and uniform material to form,
Keep effective mode field diameter and bending property.The refractive index of sandwich layer is in sunk structure, and inner cladding is used along radial direction by interior
Structure that outside refractive index gradually decreases changes by adjusting the variable pitch of inner cladding refractive index and the thickness of inner cladding
The mode field diameter and cutoff wavelength of optical fiber make optical fiber meet ITU-T G.657.B3 standard, so that the covering that sink sink deeply
Degree can reduce (the relative index of refraction difference for the covering that sink is close to zero), the thickness for the covering that sink is thinned, that is, can subtract
The fluorine doped amount of sagging covering less, reduces specific gravity of the sagging covering in fiber cross-sections, reduces the deposition process amount for the covering that sink,
Technique controlling difficulty is thus reduced, the processing efficiency of preform is improved, reduces the manufacturing cost of optical fiber.
Further, the ratio of the diameter of the inner cladding and sandwich layer diameter is 4~5, the sagging cladding diameter and core
The ratio of layer diameter is 4~8.The thickness relativeness for controlling inner cladding, sink covering and sandwich layer, before meeting optical fiber property
The thickness for broadening inner cladding, the thickness of the sagging covering of reduction and sagging depth are put, so that fluorine doped amount is effectively reduced, reduction work
Skill controls difficulty and manufacturing cost.
Further, the sandwich layer diameter is 7.5 μm~8.5 μm, and the diameter of inner cladding is 30 μm~42.5 μm, is sunk
Cladding diameter is 30 μm~68 μm.
Further, the relative index of refraction difference of the sandwich layer is 0.3~0.4%, the relative index of refraction difference of inner cladding
It is -0.2%~0.2%.
Further, radially the relative index of refraction difference at most inner boundary is 0%~0.2% to the inner cladding, interior
The relative index of refraction difference of the radially outermost interface of covering is -0.2%~0%, by adjusting the variation of inner cladding refractive index
The thickness of gradient and inner cladding changes the mode field diameter and cutoff wavelength of optical fiber, and the performance of optical fiber is made to meet ITU-T
G.657.B3 standard.
Further, the relative index of refraction difference of the sagging covering is -0.5~-0.3%, the sagging depth of the covering that sink
It is relatively small, to reduce fluorine doped amount, reduce technique controlling difficulty and manufacturing cost.
Further, the sandwich layer diameter is 8 μm, and the diameter of inner cladding is 37.7 μm~42 μm, cladding diameter of sinking
It is 53~54.9 μm, the relative index of refraction difference of sandwich layer is 0.39%, the relative index of refraction difference of inner cladding is -0.05%~
0.06%, the relative index of refraction difference for the covering that sink is -0.36~-0.35%.
Compared with prior art, the utility model advantage is:
The refractive index profile that more covering bending loss insensitive single-mode fibers described in the utility model pass through optimization optical fiber
Structure, making optical fiber not only has lower bending added losses, but also there is stable mechanical performance and uniform material to form,
Keep effective mode field diameter and bending property, core refractive rate section is in sunk structure, and inner cladding use along radial direction by
The structure that refractive index gradually decreases from inside to outside changes by adjusting the variable pitch of inner cladding refractive index and the thickness of inner cladding
The mode field diameter and cutoff wavelength of darkening fibre make optical fiber meet ITU-T G.657.B3 standard, broaden the thickness of inner cladding, subtract
The thickness of small sagging covering and sagging depth reduce specific gravity of the sagging covering in fiber cross-sections, reduce the heavy of the covering that sink
Product processing capacity reduces technique controlling difficulty to effectively reduce fluorine doped amount, improves the processing efficiency of preform, drops
The low manufacturing cost of optical fiber.
Detailed description of the invention
Fig. 1 is Refractive Index Profile of Optical structural schematic diagram.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
A kind of more covering bending loss insensitive single-mode fibers disclosed in the utility model embodiment change refractive index profile
Structure optimizes the parameters such as fibre-optic mode field diameter and cutoff wavelength, reduces fluorine doped amount, reduces technique controlling difficulty, and reduction is fabricated to
This.
As shown in Figure 1, a kind of more covering bending loss insensitive single-mode fibers, including sandwich layer and covering, the sandwich layer
The refractive index concave shape distribution high in the low outside in center, reduces optical fiber to curved sensibility, the covering outside sandwich layer is arranged in
It is successively inner cladding, sagging covering and surrounding layer from inside to outside, the refractive index of sandwich layer is higher than inner cladding, sink covering and surrounding layer
Refractive index, the refractive index of inner cladding gradually decreases from inside to outside along radial, adjusts the gradient of inner cladding refractive index section
The mode field diameter and cutoff wavelength for changing optical fiber with inner cladding thickness, make it meet ITU-T G.657.B3 standard, and sink covering
Refractive index for fluorine doped layer, the covering that sink is lower than inner cladding and surrounding layer.
Sandwich layer diameter a1 is 7.5 μm~8.5 μm, and the relative index of refraction difference Δ 1 of sandwich layer is 0.3~0.4%；
The ratio a2/a1 of the diameter a2 and sandwich layer diameter a1 of inner cladding are 4~5, the diameter a2 of inner cladding is 30 μm~
42.5 μm, the thickness of inner cladding is increased, the relative index of refraction difference of inner cladding is -0.2%~0.2%, and inner cladding edge
The relative index of refraction difference Δ 21 of radially inner most interface is 0%~0.2%, the opposite folding of the radially outermost interface of inner cladding
Penetrating rate difference DELTA 22 is -0.2%~0%；
The ratio a3/a1 of sagging cladding diameter a3 and sandwich layer diameter a1 is 4~8, and the cladding diameter a3 that sink is 30 μm~68 μ
M, the relative index of refraction difference Δ 3 for the covering that sink are -0.5~-0.3%, and the thickness and sagging depth for reducing the covering that sink (sink
The relative index of refraction difference of covering is close to zero), so as to reduce fluorine doped amount, reduce technique controlling difficulty and manufacturing cost；
Surrounding layer is pure SiO2Layer, relative index of refraction difference are 0%, and the diameter of surrounding layer is 125 ± 1 μm.
Preferably, sandwich layer diameter a1 is 8 μm, and the diameter a2 of inner cladding is 37.7 μm~42 μm, and the cladding diameter a3 that sink is
53~54.9 μm, the relative index of refraction difference Δ 1 of sandwich layer is 0.39%, the relative index of refraction difference of inner cladding is -0.05%~
0.06%, the relative index of refraction difference Δ 3 for the covering that sink is -0.36~-0.35%, and the diameter a4 of surrounding layer is 125 μm.
Performance parameter using the optical fiber of above-mentioned refractive index profile structure is as shown in table 1, and the performance of optical fiber meets ITU-T
G.657.B3 standard, the thinner thickness for the covering that sink and sagging depth are smaller, and fluorine doped amount is small, reduce technique controlling difficulty and manufacture
Cost.
1 optical fiber property parameter of table
Above are merely preferred embodiments of the utility model, it is noted that above-mentioned preferred embodiment should not regard
For limitations of the present invention, the protection scope of the utility model should be defined by the scope defined by the claims..For
For those skilled in the art, without departing from the spirit and scope of the utility model, it can also make several
Improvements and modifications, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (7)
1. a kind of more covering bending loss insensitive single-mode fibers, including sandwich layer and covering, which is characterized in that the folding of the sandwich layer
The rate concave shape distribution high in the low outside in center is penetrated, the covering outside sandwich layer, which is arranged in, to be successively inner cladding from inside to outside, sink
Covering and surrounding layer, the refractive index of the sandwich layer are higher than the refractive index of inner cladding, sink covering and surrounding layer, the inner cladding
Refractive index gradually decreases from inside to outside along radial, and the covering that sink is fluorine doped layer, the refractive index of the covering that sink lower than inner cladding and
Surrounding layer.
2. more covering bending loss insensitive single-mode fibers according to claim 1, which is characterized in that the inner cladding
The ratio (a2/a1) of diameter (a2) and sandwich layer diameter (a1) are 4~5, the sagging cladding diameter (a3) and sandwich layer diameter (a1)
Ratio (a3/a1) be 4~8.
3. more covering bending loss insensitive single-mode fibers according to claim 2, which is characterized in that the sandwich layer is straight
Diameter (a1) is 7.5 μm~8.5 μm, and the diameter (a2) of inner cladding is 30 μm~42.5 μm, sink cladding diameter (a3) be 30 μm~
68μm。
4. more covering bending loss insensitive single-mode fibers according to claim 1, which is characterized in that the phase of the sandwich layer
Refractive index difference (Δ 1) is 0.3~0.4%, and the relative index of refraction difference of inner cladding is -0.2%~0.2%.
5. more covering bending loss insensitive single-mode fibers according to claim 4, which is characterized in that the inner cladding
Radially the relative index of refraction difference (Δ 21) most at inner boundary is 0%~0.2%, the phase of the radially outermost interface of inner cladding
Refractive index difference (Δ 22) is -0.2%~0%.
6. more covering bending loss insensitive single-mode fibers according to claim 1, which is characterized in that the sagging covering
Relative index of refraction difference (Δ 3) be -0.5~-0.3%.
7. more covering bending loss insensitive single-mode fibers according to claim 1, which is characterized in that the sandwich layer is straight
Diameter (a1) is 8 μm, and the diameter (a2) of inner cladding is 37.7 μm~42 μm, and sagging cladding diameter (a3) is 53~54.9 μm, sandwich layer
Relative index of refraction difference (Δ 1) be 0.39%, the relative index of refraction difference of inner cladding is -0.05%~0.06%, and sink packet
The relative index of refraction difference (Δ 3) of layer is -0.36~-0.35%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519640A (en) * | 2018-06-08 | 2018-09-11 | 成都富通光通信技术有限公司 | A kind of more covering bending loss insensitive single-mode fibers |
| CN114397727A (en) * | 2021-07-21 | 2022-04-26 | 国家电网有限公司信息通信分公司 | Ultralow-attenuation large-effective-area single-mode fiber |
-
2018
- 2018-06-08 CN CN201820895166.8U patent/CN208239660U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519640A (en) * | 2018-06-08 | 2018-09-11 | 成都富通光通信技术有限公司 | A kind of more covering bending loss insensitive single-mode fibers |
| CN114397727A (en) * | 2021-07-21 | 2022-04-26 | 国家电网有限公司信息通信分公司 | Ultralow-attenuation large-effective-area single-mode fiber |
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