CN102998742B - Anti-bending single mode fiber with small mode field - Google Patents
Anti-bending single mode fiber with small mode field Download PDFInfo
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- CN102998742B CN102998742B CN201210538228.7A CN201210538228A CN102998742B CN 102998742 B CN102998742 B CN 102998742B CN 201210538228 A CN201210538228 A CN 201210538228A CN 102998742 B CN102998742 B CN 102998742B
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Abstract
The invention relates to an anti-bending single mode fiber with a small mode field. The single mode fiber comprises a core layer and cladding layers and is characterized in that a relative refractive index difference delta1 of the core layer ranges from 0.9% to 1.1%, and the core layer radius R1 ranges from 2.4mu m to 3.0mu m; inner and outer cladding layers are wound outside the core layer; and a relative refractive index difference delta2 of the inner cladding layer ranges from 0% to -0.1%, and the inner cladding layer radius R2 ranges from 9mu m to 12mu m; and the outer cladding layer is arranged outside the inner cladding layer. According to the anti-bending single mode fiber, optical signals can be effectively restrained in the core layer to be spread, and simultaneously, the optical signals are effectively prevented from spreading to outer layers in a bending state, so that the anti-bending performance of optical fibers is improved greatly, and the optical fibers can be used in the condition that a minimum bending radius reaches 3mm; the core layer and the cladding layers of the fiber is doped with fluorine, so that the viscosity mismatching problem of the core layer and the cladding layers is solved, residual stresses in the fiber is few after wiredrawing, and the attenuation property of the fiber can be improved; and the anti-bending single mode fiber with the small mode field is applicable to optical fiber devices, so that operation capacities of the optical fiber devices are enhanced.
Description
Technical field
The present invention relates to a kind of counter-bending single-mode fiber in little mould field for optical communication system, this optical fiber has minimum crooked added losses, can in optical fibre device, use, and belongs to optical communication technique field.
Background technology
Fast development along with optical communication technique, single-mode fiber replaces copper cash and has been widely used in the control system of short-distance and medium-distance, in system integration process, people propose more and more higher requirement for device miniaturization, therefore the bending radius of optical fiber also requires more and more less, under very little bending radius, extremely low crooked added losses are very important requirements.In the device having used, require optical fiber minimum bending radius to reach 3mm.
Conventionally the bending resistance that improves single-mode fiber has two kinds of modes, and the one, reduce fibre-optic mode field diameter and guarantee cutoff wavelength simultaneously, keep the certain MAC value ratio of cutoff wavelength (mode field diameter with), MAC value is less, and bending loss correspondence is less.The 2nd, adopt double clad structure to improve bending property; Or inner cladding is become to sagging covering, or the covering that increase to sink outside inner cladding, when guaranteeing larger mode field diameter, improves the counter-bending characteristic of optical fiber.A kind of rear method is widely used in bend insensitive fiber (G.657 optical fiber).As Chinese patent CN101598834A, US Patent No. 7450807 and European patent EP 1978383 etc.In US Patent No. 7450807, described a kind of low bend loss optical fiber that passes through to deepen lower limit ring, but its bending resistance still belongs to the level of common counter-bending optical fiber.In patent WO2004/092794, described the low bend loss single mode optical fiber of a series of different doping, but in its most of design, the bending loss of 10mm diameter increases greatly, cannot adapt to the request for utilization in minimum crooked situation.
Do not requiring the application scenario being connected with common G.652 optical fiber, the coupling of mode field diameter is not as one of problem of overriding concern, and therefore little mode field diameter design can adopt.
Summary of the invention
Introduce for convenience content of the present invention, define following term:
Refractive index profile: the relation in optical fiber between glass refraction and fiber radius.
Refractive index contrast:
,
with
be respectively the refractive index of each corresponding part and the refractive index of pure silicon dioxide.
The contribution amount of fluorine (F): mix fluorine (F) quartz glass for the refractive index contrast (Δ F) of pure silicon dioxide quartz glass, represent to mix fluorine (F) amount with this.
Technical matters to be solved by this invention is that the deficiency existing for above-mentioned prior art provides a kind of little mould field counter-bending single-mode fiber, and this optical fiber has minimum crooked added losses, can in minimum bending radius situation, use.
The present invention is that the technical scheme that the problem of the above-mentioned proposition of solution adopts is: comprise sandwich layer and covering, it is characterized in that the refractive index contrast Δ 1 of described sandwich layer is 0.9% ~ 1.1%, sandwich layer radius R 1 is 2.4 ~ 3.0 μ m; Be centered around sandwich layer and have inside and outside two coverings outward; Inner cladding refractive index contrast Δ 2 is 0% ~-0.1%, and inner cladding radius R 2 is 9 ~ 12 μ m; Inner cladding is outward surrounding layer.
Press such scheme, described sandwich layer is mixed altogether the quartz glass that quartz glass or germanium and other adulterant mix altogether and is formed by mixing the quartz glass of germanium or germanium fluorine; In sandwich layer, the contribution amount Δ Ge of germanium is 0.9% ~ 1.1%, and the contribution amount Δ F of fluorine (F) is equal to or less than-0.1%.
Press such scheme, described inner cladding forms by mixing the quartz glass that fluorine or germanium fluorine mix altogether, inner cladding radius R 2 is 4 ~ 4.5 with the ratio R 2/R1 of sandwich layer radius R 1, and inner cladding refractive index contrast △ 2 is 1.0% to 1.16% with the difference (△ 1-△ 2) of sandwich layer refractive index contrast △ 1.
Press such scheme, described surrounding layer is comprised of pure quartz glass.
Press such scheme, described single-mode fiber is less than or equal to 0.52dB/km at the attenuation coefficient at 1310nm wavelength place; Mode field diameter at 1310nm wavelength place is 4.5 ~ 5.5 μ m;
Press such scheme, described single-mode fiber is less than or equal to 0.30dB/km at the attenuation coefficient at 1550nm wavelength place; Mode field diameter at 1550nm wavelength place is 5.5um to 6.5 μ m.
Press such scheme, described single-mode fiber has the cable cut-off wavelength that is less than or equal to 1260nm.
Press such scheme, described single-mode fiber is at 1550nm wavelength place, for being less than or equal to 0.1dB around the crooked added losses of the rich circle of 3mm bending radius, for being less than or equal to 0.05dB around the crooked added losses of the rich circle of 5mm bending radius, for being less than or equal to 0.01dB around the crooked added losses of the rich circle of 7.5mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of the rich circle of 10mm bending radius, for being less than or equal to 0.002dB around the crooked added losses of rich ten circle of 15mm bending radius.
Press such scheme, described single-mode fiber is at 1625nm wavelength place, for being less than or equal to 0.2dB around the crooked added losses of the rich circle of 3mm bending radius, for being less than or equal to 0.1dB around the crooked added losses of the rich circle of 5mm bending radius, for being less than or equal to 0.02dB around the crooked added losses of the rich circle of 7.5mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of the rich circle of 10mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of rich ten circle of 15mm bending radius.
Beneficial effect of the present invention is: 1, the contribution amount of sandwich layer doped germanium is large, can effectively light signal be constrained in sandwich layer and be propagated, simultaneously under case of bending, effectively stop the outside Es-region propagations of light signal, the bending resistance of optical fiber is greatly improved, can under minimum bending radius reaches the minimum bending radius situation of 3mm, uses; 2, the sandwich layer of optical fiber and inner cladding, doped with fluorine, improve the viscosity mismatch problem of sandwich layer and clad material, and after wire drawing, inside of optical fibre unrelieved stress reduces, and can improve the fade performance of optical fiber; 3, can in optical fibre device, use, strengthen the service ability of optical fibre device.
Accompanying drawing explanation
Fig. 1 is the radial section schematic diagram of one embodiment of the present of invention.
Fig. 2 is the refractive index profile schematic diagram of one embodiment of the invention.
Fig. 3 is one embodiment of the invention Refractive Index Profile of Optical figure.
Embodiment
To provide detailed embodiment below, the present invention is described further.
Include sandwich layer and covering, sandwich layer 00 is comprised of the quartz glass of mixing germanium (Ge) and fluorine (F), or is comprised of the quartz glass of mixing germanium and other adulterant; Being centered around sandwich layer has two coverings outward, and inner cladding 10 is closely around sandwich layer, by mixing the quartz glass that fluorine or germanium fluorine mix altogether, forms; Surrounding layer 20, closely around inner cladding, is comprised of pure quartz glass.
By the technical scheme of above-mentioned single-mode fiber, parameter at the scope interior focusing fibre of its defined designs, and the plug manufacturing process such as the PCVD knowing by us, MCVD, OVD or VAD technique is manufactured plug according to optical fiber designing requirement, by sleeve pipe technique, OVD technique etc., carry out the manufacture of surrounding layer, complete the manufacture of whole prefabricated rods.
The refractive index profile major parameter of optical fiber is as shown in table 1.
The Specifeca tion speeification of optical fiber is as shown in table 2.
Macrobend added losses method of testing, according to the method for stipulating in IEC60793-1-47, is coiled into 1 circle or 10 circles by optical fiber by certain diameter, then circle is decontroled, and tests respectively the variation of luminous power before and after looping, as the crooked added losses of optical fiber.Main measuring fiber, at the crooked added losses at 1550nm and 1625nm place, infers that optical fiber is at the flexural property of whole wave band.
From embodiment, can find out, (Δ 1-Δ 2) has comparatively significantly impact for the bending property of optical fiber, larger (Δ 1-Δ 2) value is corresponding better macrobend added losses, this is because high refractive index can better retrain light and transmit at sandwich layer, be subject under crooked equal stress effect, also be not easy to leak in covering, produce added losses.And covering mix fluorine or germanium fluorine is mixed region altogether, can make the viscosity of material of sandwich layer and covering obtain certain coupling, thereby reduce the internal stress producing in drawing process, thereby avoid the loss that mold leakage causes to increase.Yet more doped with fluorine can cause inside quartz glass defect to increase, thereby make fibre loss generation adverse effect, and the further reduction of viscosity also can make this region viscosity further reduce, be unfavorable on the contrary bearing in drawing process drawing tensile force, make core segment concentrate more stress, these all can cause loss to increase.Therefore need to consider the degree of depth and the width of mixing fluorine region, viscosity of material coupling and fault in material are reduced.
Test shows, the optical fiber of manufacturing according to technical scheme of the present invention, the mode field diameter at its 1550nm place is about 6 μ m left and right, cable cut-off wavelength is below 1260nm, the attenuation at 1550nm place is below 0.3dB/km, and optical fiber has fabulous counter-bending characteristic, 1550nm wavelength place, for being less than or equal to 0.1dB around the crooked added losses of the rich circle of 3mm bending radius, for being less than or equal to 0.05dB around the crooked added losses of the rich circle of 5mm bending radius, for being less than or equal to 0.01dB around the crooked added losses of the rich circle of 7.5mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of the rich circle of 10mm bending radius, for being less than or equal to 0.002dB around the crooked added losses of rich ten circle of 15mm bending radius, at 1625nm wavelength place, for being less than or equal to 0.2dB around the crooked added losses of the rich circle of 3mm bending radius, for being less than or equal to 0.1dB around the crooked added losses of the rich circle of 5mm bending radius, for being less than or equal to 0.02dB around the crooked added losses of the rich circle of 7.5mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of the rich circle of 10mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of rich ten circle of 15mm bending radius.
Claims (9)
1. the counter-bending single-mode fiber in little mould field, comprises sandwich layer and covering, it is characterized in that the refractive index contrast Δ 1 of described sandwich layer is 0.9% ~ 1.1%, and sandwich layer radius R 1 is 2.4 ~ 3.0 μ m; Be centered around sandwich layer and have inside and outside two coverings outward; Inner cladding refractive index contrast Δ 2 is 0% ~-0.1%, and inner cladding radius R 2 is 9 ~ 12 μ m; Inner cladding is outward surrounding layer; Described sandwich layer is mixed altogether the quartz glass that quartz glass or germanium and other adulterant mix altogether and is formed by mixing the quartz glass of germanium or germanium fluorine; Described inner cladding forms by mixing the quartz glass that fluorine or germanium fluorine mix altogether; Described refractive index contrast is that each several part is with respect to the refringence of pure silicon dioxide.
2. by the counter-bending single-mode fiber in little mould claimed in claim 1 field, it is characterized in that described sandwich layer contribution amount Δ Ge of germanium in sandwich layer is 0.9% ~ 1.1%, the contribution amount Δ F of fluorine (F) is equal to or less than-0.1%.
3. by the counter-bending single-mode fiber in little mould field described in claim 1 or 2, it is characterized in that described inner cladding radius R 2 and the ratio R 2/R1 of sandwich layer radius R 1 are 4 ~ 4.5, inner cladding refractive index contrast △ 2 is 1.0% to 1.16% with the difference (△ 1-△ 2) of sandwich layer refractive index contrast △ 1.
4. by the counter-bending single-mode fiber in little mould field described in claim 1 or 2, it is characterized in that described surrounding layer is comprised of pure quartz glass.
5. by the counter-bending single-mode fiber in little mould field described in claim 1 or 2, it is characterized in that the attenuation coefficient of described single-mode fiber at 1310nm wavelength place is less than or equal to 0.52dB/km; Mode field diameter at 1310nm wavelength place is 4.5 ~ 5.5 μ m.
6. by the counter-bending single-mode fiber in little mould field described in claim 1 or 2, it is characterized in that the attenuation coefficient of described single-mode fiber at 1550nm wavelength place is less than or equal to 0.30dB/km; Mode field diameter at 1550nm wavelength place is 5.5um to 6.5 μ m.
7. by the counter-bending single-mode fiber in little mould field described in claim 1 or 2, it is characterized in that described single-mode fiber has the cable cut-off wavelength that is less than or equal to 1260nm.
8. by the counter-bending single-mode fiber in little mould field described in claim 1 or 2, it is characterized in that described single-mode fiber is at 1550nm wavelength place, for being less than or equal to 0.1dB around the crooked added losses of the rich circle of 3mm bending radius, for being less than or equal to 0.05dB around the crooked added losses of the rich circle of 5mm bending radius, for being less than or equal to 0.01dB around the crooked added losses of the rich circle of 7.5mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of the rich circle of 10mm bending radius, for being less than or equal to 0.002dB around the crooked added losses of rich ten circle of 15mm bending radius.
9. by the counter-bending single-mode fiber in little mould field described in claim 1 or 2, it is characterized in that described single-mode fiber is at 1625nm wavelength place, for being less than or equal to 0.2dB around the crooked added losses of the rich circle of 3mm bending radius, for being less than or equal to 0.1dB around the crooked added losses of the rich circle of 5mm bending radius, for being less than or equal to 0.02dB around the crooked added losses of the rich circle of 7.5mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of the rich circle of 10mm bending radius, for being less than or equal to 0.005dB around the crooked added losses of rich ten circle of 15mm bending radius.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9658394B2 (en) * | 2014-06-24 | 2017-05-23 | Corning Incorporated | Low attenuation fiber with viscosity matched core and inner clad |
| CN104391351B (en) * | 2014-11-25 | 2017-07-21 | 长飞光纤光缆股份有限公司 | A kind of anti-bending multimode fiber |
| CN105137536B (en) * | 2015-09-18 | 2018-07-03 | 长飞光纤光缆股份有限公司 | A kind of single mode optical fiber |
| CN106154410A (en) * | 2016-08-30 | 2016-11-23 | 烽火通信科技股份有限公司 | A kind of single-mode fiber and manufacture method thereof |
| CN107357004B (en) * | 2017-07-04 | 2020-04-21 | 长飞光纤光缆股份有限公司 | Low-attenuation single-mode optical fiber and preparation method thereof |
| CN107632338B (en) * | 2017-10-31 | 2020-06-16 | 江苏亨通光导新材料有限公司 | Bending-resistant single-mode optical fiber and manufacturing method thereof |
| CN109116466A (en) * | 2018-08-24 | 2019-01-01 | 长飞光纤光缆股份有限公司 | A kind of thin footpath small-bend radius single mode optical fiber |
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