CN205263346U - Single -mode fiber low in loss and high in effective area - Google Patents
Single -mode fiber low in loss and high in effective area Download PDFInfo
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- CN205263346U CN205263346U CN201520968341.8U CN201520968341U CN205263346U CN 205263346 U CN205263346 U CN 205263346U CN 201520968341 U CN201520968341 U CN 201520968341U CN 205263346 U CN205263346 U CN 205263346U
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Abstract
The utility model relates to a single -mode fiber low in loss and high in effective area has the characteristics that the loss of 1550nm wavelength is low, effective area is big, can apply to long distance transmission, the big effective area optic fibre of low -loss, have the characteristics that parameter stability is good, macrobend loss is low. It is lighter than 1500nm at effective area 100~200 mu m2 of 1550nm, optical cable cutoff wavelength, and optic fibre includes fibre core district, isolation region, irrigation canals and ditches district, 5 regions in protection zone and the outsourcing district in proper order from the center to the periphery.
Description
Technical field
The utility model relates to a kind of low-loss large effective area single-mode fiber, have 1550nm wavelength loss low,The feature that effective area is large, can apply to long Distance Transmission; Be a kind of low-loss large effective area fiber, there is parameter stabilityThe feature that property is good, macrobending loss is low.
Background technology
In long distance optical communication systems at a high speed, the nonlinear effect of signal-to-noise ratio degradation and optical fiber will be to restrict the distance of communicating by letterFrom principal element. Increase optical fiber effective area, reduce fibre loss, improve fibre-optical dispersion and overcome this two restraining factorsMain path. Reduce fibre loss and can slow down the speed of signal-to-noise ratio degradation, but for reduce nonlinear effect without anyEffect. Can reduce nonlinear effect and can reduce signal to noise ratio and increase effective area. Well-known silica fibre is decayedLow value occurs in wavelength 1550nm, and modern long distance optical communication system is normally operated near 1550nm. At present the scope of applicationCommon G.652 optical fiber is less than 0.21dB/km in the loss of 1550nm widely, and its representative value is 0.19dB/km; At 1550nmNet sectional area be approximately 83, dispersion is approximately 16ps/km/nm. And the following ideal fiber that is applied to long-distance optical communication shouldThere is than G.652 lower loss larger effective area and the dispersion of Lve Gao.
The design of the large effective area that bibliography CN102959438A and CN102313924A provide is for pure siliconThe optical fiber design of core cannot realize simply in VAD and OVD technique.
The prefabricated rod mandrel of the described large effective area fiber of bibliography CN1550508A can adopt VAD and OVDTechnique is manufactured. But in order to take into account the application of 1310nm and two wavelength of 1550nm, fiber cut off wavelength is less than in design1340nm, is much higher than 1dB at the macrobending loss (10mm-radius 1 encloses) of 1625nm simultaneously. In its several main designs,Fibre core and irrigation canals and ditches are adjacent. The major defect of these designs is that the fluctuation of optical fiber irrigation canals and ditches district parameter will cause optical fiber major parameterLarge variation, makes in large-scale production, to be difficult to control the distribution of optical fiber parameter.
The described large effective area fiber of bibliography CN102313924A and US846749B2 adopts narrow and dark ditchCanal design. The broadband of trench regions is greatly about 5 left and right. And refringence is lower than-4.6 × 10-3(0.13%). This design existsOn VAD and OVD equipment, directly realize by very large difficulty, conventionally adopt PCVD, the sleeve pipe technique of POD outsourcing or doping, fromAnd process complexity and manufacturing cost are greatly increased.
Bibliography CN103955020A has proposed to be suitable for the design and processes of kinds of processes large-scale production, this establishingMeter has core region, isolated area, irrigation canals and ditches district, outsourcing district and central concave, adopts this technique to produce performance betterLow-loss large effective area fiber, but using two-step method to manufacture in the process of preform, especially adopt VAD+OVDTechnique is manufactured in the process of preform, owing to mixing the diffusion of fluorine element, causes the fibre loss of producing and cutoff wavelength notStable, thus process complexity and the stability that has reduced product quality greatly increased.
Summary of the invention
The utility model object is to provide a kind of low-loss large effective area single-mode fiber for above-mentioned weak point, adoptsTwo-step method is manufactured low-loss large effective area single-mode fiber prefabricated rods, makes optical fiber by preform, and its periphery successivelyComprise core region, isolated area, irrigation canals and ditches district, protection zone and region, 5, outsourcing district. Its low cost of manufacture, parametric stability is good, canTo obtain lower loss, be especially applicable to the two-step method manufacturing process of the VAD+OVD of large-scale production.
A kind of low-loss large effective area single-mode fiber of the present utility model is to take following technical scheme to realize:,
A kind of low-loss large effective area single-mode fiber of the present utility model, the periphery of single-mode fiber comprises fibre core successivelyDistrict, isolated area, irrigation canals and ditches district, protection zone and region, 5, outsourcing district.
A kind of low-loss large effective area single-mode fiber of the present utility model, adopts two-step method manufacturing process, first step systemMake plug, second step is manufactured surrounding layer. The plug that the first step is manufactured, the periphery of single-mode fiber comprise successively core region, isolated area,Irrigation canals and ditches district and protection zone; Second step is manufactured surrounding layer, forms outsourcing district.
Manufacture in the process of plug in the first step, need to melt contracting and heat treatment to plug, and the effect of protection zone isForm layer protective layer, prevent that the fluorine element in irrigation canals and ditches district from melting in contracting and heat treatment process and spreading at plug.
A kind of low-loss large effective area single-mode fiber prefabricated rods of the present utility model, its periphery comprises fibre core successivelyDistrict, isolated area, irrigation canals and ditches district, protection zone and region, 5, outsourcing district, its parameter is as follows:
A) core region: the therefrom outward extending radius R 1 of the heart, scope 4～10 μ m of R1, its representative value is 6.0～9.0 μM. This areas diffract rate variance scope 0～0.3%, representative value is 0.1%～0.2%.
B) isolated area: stretch out from R1, thickness is R2, scope 2～21 μ m of R2, its representative value 5～10 μ m. This regionRefringence scope-0.005%～0.05%, when representative value 0～0.005%.
C) irrigation canals and ditches district: stretch out from R1+R2, thickness is R3, is n2 with respect to the refringence of isolated area, the model of n2Wei≤-0.07%, representative value is-0.05%～-0.30%.
D) protection zone: stretch out from R1+R2+R3, thickness is R4, and the effect in this region is to prevent in manufacturing processThe doped with fluorine element in irrigation canals and ditches district, to external diffusion, is strapped in fluorine element in irrigation canals and ditches district; Scope 2～21 μ m of R4, its representative value 5～10μm；
E) outsourcing district: the optical fiber edge stretching out from R1+R2+R3+R4, thickness is R5, the outer warp of optical fiber is R1+R2+R3+R4+R5, the value in this region designs based on optical fiber, and representative value is 62.5 μ m.
The optical fiber that adopts above design to manufacture, effective area 100～200 μ m of 1550nm2; In the dispersion of 1550nmBe greater than 19ps/nm/km. Loss at 1550nm can be lower than 0.180dB/km, and cable cut-off wavelength is less than 1500nm,1625nm wavelength, the macrobending loss that 10mm radius 1 encloses is less than the macrobending loss that 1dB, 30mm radius 100 enclose and is less than 0.05dB.
A manufacture method for low-loss large effective area single-mode fiber prefabricated rods, is described below:
Deposit manufacture method in pipe: this method is suitable for PCVD, MCVD and FCVD technique. Adopt in this way in prefabricated rodsIn the manufacturing process of plug, adopt high-purity quartz ampoule as base tube, adopt SiCl4 as raw material, GeCl4 is as mixing the former of germaniumMaterial, SiF4、C2F6Or SF6As the raw material of mixing fluorine. In Guan Zhongxian deposition irrigation canals and ditches district, then deposit isolated area, finally deposit fibre coreDistrict, in deposition process, change germanium successively and the doping content of fluorine, form corresponding index distribution value. Quartz base tube canSeparately as protection zone. Finally melt contracting and form plug.
Directly depositing: this method is suitable for VAD sedimentation, VAD sedimentation is at present most popular in enormous quantitiesThe manufacturing technology of manufacture order mode fiber prefabricated rods. Fig. 3 is the schematic diagram of VAD deposit manufacture plug, and 4 different regions can be dividedDo not deposit and form simultaneously by 4 ~ 5 different blowtorch. Core core region is deposited by a blowtorch, and raw material is SiCl4 and GeCl4; EveryAbscission zone is deposited by a blowtorch, and raw material is SiCl4; Irrigation canals and ditches district is deposited by 1 ~ 2 blowtorch, and raw material is SiCl4 and SiF4; Protection zoneFormed by a blowtorch, raw material is SiCl4 and SiF4. Deposition form Powder Rod through deshydroxy, melt contracting form plug.
The plug that adopts above method to manufacture, through measuring after calculating, obtains needed diameter of mandrel and outsourcing bed thicknessDegree, obtains the plug of goal standard, then is melted contracting or outside deposition, melted by quartz glass tube by heat treatment extension, alignmentThe method of contracting forms surrounding layer, finally forms preform by degassed, tip.
A kind of low-loss large effective area single-mode fiber prefabricated rods and manufacture method advantage thereof:
The utility model is compared with prior art (CN03955020A), and the distinguishing feature having is: outside of trenches in plugProtective layer structure, can effectively hold onto the doping content of fluorine, can realize lower fibre loss, be suitable for various worksSkill, the especially large-scale production of VAD technique.
The optical fiber that adopts above design to manufacture, effective area 100～200 μ m of 1550nm2; In the dispersion of 1550nmBe greater than 19ps/nm/km. Loss at 1550nm can be lower than 0.180dB/km, and cable cut-off wavelength is less than 1500nm,1625nm wavelength, the macrobending loss that 10mm radius 1 encloses is less than the macrobending loss that 1dB, 30mm radius 100 enclose and is less than 0.05dB.
Brief description of the drawings
Fig. 1 is optical fiber schematic cross-section described in the utility model.
Fig. 2 is Refractive Index Profile of Optical schematic diagram described in the utility model.
Fig. 3 is the case schematic diagram that optical fiber described in the utility model adopts VAD technique to realize.
In figure: 1, core region, 2, isolated area, 3, irrigation canals and ditches district, 4, protection zone, 5, outsourcing district, 6, blowtorch one, 7, blowtorch two,8, blowtorch three, 9, blowtorch four, 10, blowtorch five.
Detailed description of the invention
With reference to accompanying drawing 1～3, a kind of low-loss large effective area single-mode fiber, it the effective area 100 of 1550nm～200μm2, cable cut-off wavelength is less than 1500nm, and optical fiber comprises successively core region 1, isolated area 2, irrigation canals and ditches district from center to periphery3, protection zone 4 and outsourcing district 5, wherein:
A) core region 1: the therefrom outward extending radius R 1 of the heart, scope 4～10 μ m of R1, its representative value is 6.0～9.0 μM. This areas diffract rate variance scope 0～0.3%, representative value is 0.1%～0.2%.
B) isolated area 2: stretch out from R1, thickness is R2, scope 2～21 μ m of R2, its representative value 5～10 μ m. This districtTerritory refringence scope-0.005%～0.05%, when representative value 0～0.005%.
C) irrigation canals and ditches district 3: stretch out from R1+R2, thickness is R3, is n2 with respect to the refringence of isolated area, the model of n2Wei≤-0.07%, representative value is-0.05%～-0.30%.
D) protection zone 4: stretch out from R1+R2+R3, thickness is R4, the effect in this region is anti-in manufacturing processOnly the doped F in irrigation canals and ditches district, to external diffusion, is strapped in F in irrigation canals and ditches district; Scope 2～21 μ m of R4, its representative value 5～10 μ m;
E) outsourcing district 5: the optical fiber edge stretching out from R1+R2+R3+R4, thickness is R5, the outer warp of optical fiber is R1+ R2+R3+R4+R5, the value in this region designs based on optical fiber, and representative value is 62.5 μ m.
The optical fiber of this design is suitable for the various manufacturing process such as VAD, MCVD, PCVD and OVD, is particularly suitable for adoptingThe process route of VAD+OVD two-step process large-scale production.
Described a kind of low-loss large effective area single-mode fiber prefabricated rods, the plug manufacture method of 4 raw material blowtorch of employing,Be described below:
A manufacture method for low-loss large effective area single-mode fiber prefabricated rods, step is as follows:
1. plug producing device is made up of reaction cavity, lifting whirligig, air exhausting device and burners set. Burners set hasFor depositing the blowtorch 6 of core region, be useful on the blowtorch 7 of deposition isolated area, the blowtorch 8, blowtorch 9 that is useful on deposition irrigation canals and ditches district withAnd for depositing the blowtorch 10 of protection zone.
2. the adaptation target rod of long 450 ~ 700mm is installed on suspension rod and is placed in reaction cavity, hydrogen and oxygen are passed intoBlowtorch is also lighted in reaction cavity, produces the flame of 900 ~ 1300 DEG C of temperature.
3. blowtorch 6, passes into 3～10g/minSiCl4 and 200～400mg/minGeCl4, and embryo deposit is shape on target rodBecome core region;
4. blowtorch 7, passes into 5 ~ 10g/minSiCl4, is deposited in outside, core region, forms isolated area;
5. blowtorch 8, passes into 20 ~ 50g/minSiCl4, and mixes the fluorides such as SiF4, is deposited in isolated area outside,Form the low irrigation canals and ditches district of refractive index; If adopt 5 raw material blowtorch, can jointly form irrigation canals and ditches district with two blowtorch (8,9);
6. blowtorch 4(10), pass into 20～50g/minSiCl4, be deposited in the outside in irrigation canals and ditches district, form protection zone, this districtThe F in irrigation canals and ditches district can be effectively protected in territory, in deposition and follow-up sintering, processing, prevents from oozing out.
7. hit rod speed-raising of deposition process is 40 ~ 100mm/h, target rod rotary speed 10 ~ 50rpm.
8. the Powder Rod that deposition forms is put into the sintering furnace of 1100 DEG C, passes into 500sccmCl2 and removes hydroxyl, passes into20slmHe removes bubble and makes its vitrifying.
9. by extending, plug is extended to external diameter 45mm plug.
10. adopt OVD technique to add covering in plug outside, the prefabricated rods of last sandwich layer external diameter 150mm.
11. by prefabricated rods on wire-drawing frame, under the high temperature of 2200 DEG C, be drawn into external diameter 125 μ m, apply after 245 μThe optical fiber of m.
The optical fiber canonical parameter of 12. these case makings in form 1,1550nm loss 0.179dB/km, 1550nm is effectiveArea 192 μ m2, 1550nm dispersion 19.4ps/nm/km, cable cut-off wavelength 1352nm, the macrobend that 1625nm10mm radius 1 enclosesLoss is less than the macrobending loss that 1dB, 30mm radius 100 enclose and is less than 0.05dB.
A kind of low-loss large effective area single-mode fiber prefabricated rods of case making is drawn into the testing result of optical fiber:
A kind of low-loss large effective area single-mode fiber prefabricated rods that is more than case making is drawn into the detection of optical fiberResult.
Claims (2)
1. a low-loss large effective area single-mode fiber, is characterized in that: it is at effective area 100～200 μ m of 1550nm2，Cable cut-off wavelength is less than 1500nm, optical fiber from center to periphery, comprise successively core region, isolated area, irrigation canals and ditches district, protection zone andRegion, 5, outsourcing district, wherein:
A) core region: the therefrom outward extending radius R 1 of the heart, scope 4～10 μ m of R1, its representative value is 6.0～9.0 μ m; ShouldAreas diffract rate variance scope 0～0.3%, representative value is 0.1%～0.2%;
B) isolated area: stretch out from R1, thickness is R2, scope 2～21 μ m of R2, its representative value 5～10 μ m; This areas diffractRate variance scope-0.005%～0.05%, when representative value 0～0.005%;
C) irrigation canals and ditches district: stretch out from R1+R2, thickness is R3, is n2 with respect to the refringence of isolated area, the scope of n2≤-0.07%, representative value is-0.05%～-0.30%;
D) protection zone: stretch out from R1+R2+R3, thickness is R4, the effect in this region is in manufacturing process, to prevent irrigation canals and ditchesThe doped F in district, to external diffusion, is strapped in F in irrigation canals and ditches district; Scope 2～21 μ m of R4, its representative value 5～10 μ m;
E) outsourcing district: the optical fiber edge stretching out from R1+R2+R3+R4, thickness is R5, the outer warp of optical fiber is R1+R2+R3+R4+R5, the value in this region designs based on optical fiber, and representative value is 62.5 μ m.
2. a kind of low-loss large effective area single-mode fiber according to claim 1, is characterized in that: adopt above designThe optical fiber that scheme is manufactured, effective area 100～200 μ m of 1550nm2; Dispersion at 1550nm is greater than 19ps/nm/km; ?The loss of 1550nm can be lower than 0.180dB/km, and cable cut-off wavelength is less than 1500nm, at 1625nm wavelength, and 10mm radius 1The macrobending loss of circle is less than the macrobending loss that 1dB, 30mm radius 100 enclose and is less than 0.05dB.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334568A (en) * | 2015-11-30 | 2016-02-17 | 中天科技精密材料有限公司 | Low-loss large-effective-area single-mode optical fiber and optical fiber preform manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334568A (en) * | 2015-11-30 | 2016-02-17 | 中天科技精密材料有限公司 | Low-loss large-effective-area single-mode optical fiber and optical fiber preform manufacturing method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160525 Effective date of abandoning: 20180619 |