CN1252498C - Dispersion compensating transmission optical fiber matched with orthochromatic dispersion and ortho chromatic dispersion slope unimodel optical fiber and use - Google Patents
Dispersion compensating transmission optical fiber matched with orthochromatic dispersion and ortho chromatic dispersion slope unimodel optical fiber and use Download PDFInfo
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Abstract
The present invention relates to a dispersion compensation transmission fiber (DCTF) and purposes thereof. The waveguide structure of the single-mode fiber has a layered fiber core and a layered envelope, wherein the fiber core is provided with two fiber core layers with different refractivity distribution; the layered envelope comprises five envelope layers. The fiber core and the layers do not select single fluorine or germanium deposition but use the codeposition of fluorine and germanium by fully utilizing the advantages of the PCVD technology in the deposition process. Thus, the optical characteristics, the mechanical characteristics and the environmental characteristics of the fiber are greatly improved. The single-mode fiber of the present invention has certain negative dispersion and negative dispersion gradient in 1450 to 1675 nm, and has the advantages of low attenuation, low PMD, large effective area, low melting joint loss, and excellent anti-bending characteristic and environmental characteristic. The DCTF and fibers with positive dispersion and positive dispersion gradient are formed into a link for the transmission of dense wavelength division multiplexing (DWDM) systems.
Description
Technical field
The present invention relates to a class and be the negative dispersion single-mode optical waveguide fiber that high capacity, high speed transmission system design and the purposes of this optical fiber, specifically, the single-mode fiber that relates to has certain negative dispersion and negative dispersion slope at 1450-1675nm, has low decay, low polarization and touches chromatic dispersion (PMD), big useful area, eutectic splicing loss, excellent counter-bending characteristic and environmental characteristics.
Background technology
Since the mid-90 in 20th century, along with the development of Erbium-Doped Fiber Amplifier (EDFA) and wavelength-division multiplex technique, optical fiber communication enters the unprecedented high speed development stage.Development along with wavelength-division multiplex, it is found that the nonlinear effect between each wavelength, the influence of system has been limited the expansion of power system capacity as four-wave mixing, from phase modulation (PM), cross-phase modulation etc., in order to suppress effect of nonlinear in dense wave division multipurpose (DWDM) system, need an amount of dispersion values at the transmission wave band; Meanwhile, when transfer rate surpasses 2.5Gbit/s, and along with the practicality of fiber amplifier, chromatic dispersion replaces the key constraints that decay becomes long Distance Transmission, thereby wishes as far as possible little in the accumulative total chromatic dispersion of whole optical fiber transport channel.Thereby at long distance, high capacity and high transfer rate, as 10G/s, in the dwdm system of 40G/s, dispersion compensation is indispensable.At present, the most widely used is to realize by add the module of being made up of dispersion compensating fiber (DCF) on optical fiber link, for DCF, in order to obtain big negative dispersion, need the refractive index of optical fiber fuse very high and physical dimension is very little, like this in the fuse of DCF, it is bigger to mix the germanium amount, thereby characteristics such as the attenuation of DCF, PMD and nonlinear effect will be relative relatively poor.In addition, the another one shortcoming of utilization DCF method is attenuation, system cost, PMD and the nonlinear effect that DCF has increased system, does not but increase the length of system.
Patent CN1351267A/US2002/0076186A1 has announced the optical fiber that is used for compensation of dispersion in the line in a kind of optical fiber with positive dispersion, but its negative dispersion at the 1550nm place only is-12ps/ (nm.km) is to-4ps/ (nm.km), can't carry out full remuneration to G652 optical fiber commonly used (in the chromatic dispersion at 1550nm place greater than 16ps/ (nm.km)), in addition, the chromatic dispersion that absolute value is less, make its proportion in link bigger, useful area that it is less and bigger PMD certainly will produce adverse influence to transmission.
In patent US2002/0176678A1, a kind of optical property Reverse Dispersion Fiber and relevant link have preferably been introduced, but as the dispersion compensation optical fiber that uses in the line, need stranding and conventional positive dispersion single-mode fiber to be used, thereby except should having good optical characteristics, particularly also need to have fine environment characteristic and good welding performance etc., the material structure design of these and optical fiber is closely bound up, does not but mention in above-mentioned patent.
Definition:
---refractive indices and refractive index contribution margin
By following equation definition, refractive index contrast Δ %=[(n
1-n
c)/n
c] * 100%
N wherein
1Be fiber core refractive index, n
cBe cladding index, it is as the reference refractive index in this application.For non-step evolution (as para-curve) structure, with the maximal value sign of Δ %.
The refractive index contribution margin: as following formula, n wherein
1For containing the silica glass refractive index of certain alloy, n
cBe the refractive index of the pure silicon dioxide glass that undopes, then Δ % promptly is called as the contribution margin of this alloy, F and GeO
2Contribution margin respectively in Δ F% and Δ GeO2%.
---index distribution
Be meant the relation between refractive indices % or refractive index on the selected portion of fibre core and its radius.
---chromatic dispersion and link dispersion
Chromatic dispersion is defined as the algebraic sum of fibre-optic waveguide chromatic dispersion and material dispersion, and at fiber optic communication field, chromatic dispersion is called as CHROMATIC DISPERSION IN FIBER OPTICS, and its unit is ps/nm/km;
The link total dispersion is meant the length weighted mean value of all fibre-optical dispersions in the link, and the chromatic dispersion and the length of establishing Transmission Fibers are respectively D
T, L
T, the chromatic dispersion and the length of dispersion compensating fiber are respectively D
C, L
C, then link dispersion is: D=(D
T* L
T+ D
C* L
C)/(L
T+ L
C).
——DCF
It is the abbreviation of dispersion compensating fiber (Dispersion Compensation Fiber).
——DCTF
Being the abbreviation of dispersion compensation Transmission Fibers (Dispersion Compensation TransmissionFiber), both having played the chromatic dispersion compensation in transmission system, is again the part of transmission link, has increased transmission length.
——RDS
Be the abbreviation of relative dispersion slope (Re1ative Dispersion Slope), be meant among the present invention that at the 1550nm place, chromatic dispersion gradient is to the ratio of chromatic dispersion, that is:
RDS=S
1550/ D
1550, RDS can be used for weighing the ratio that dispersion compensating fiber compensates the chromatic dispersion gradient of Transmission Fibers.
——DSCR
Be the abbreviation of dispersion slope compensation ratio (Dispersion Slope Compensation Ration), be to weigh the index of dispersion compensating fiber, as give a definition the compensation ability of given Transmission Fibers slope:
DSCR＝(RDS
C/RDS
T)*100％
——DWDM
It is the abbreviation of dense wave division multipurpose (Dense wavelength division multiplexing).
---fibre-optic bending resistance
Fibre-optic bending resistance is meant the additional attenuation under the regulation test condition.Its standard test condition be included on the mandrel of diameter 60mm around 100 circles and on the mandrel of diameter 32mm around 1 circle.Under every kind of test condition, measure crooked additional attenuation.
---the welded joint loss
The welded joint loss is meant two fused fiber splices to a time-out, the mean value of twocouese OTDR test value.The welded joint loss of being mentioned herein all refers to the mean value at the twocouese OTDR of 1550nm test value.
---the hydrogen loss of optical fiber
The hydrogen loss of optical fiber is meant when optical fiber is in hydrogeneous environment, owing to defective and hydrogen in the optical fiber react, and the phenomenon that decay increases occurs on some characteristic wavelength, is an important indicator of optic fibre environment characteristic.The hydrogen loss test is exactly the additional attenuation characteristic of measuring fiber product under nitrogen atmosphere.The method of testing of using among the present invention is with reference to ANSI/TIA/EIA-492CAAB-2000, and measuring fiber is at the additional attenuation of 1530nm.
Summary of the invention
The objective of the invention is in order to overcome the DCF deficiency, a kind of dispersion compensation transmission single-mode fiber (DCTF) that is used for compensation positive dispersion transmission single-mode fiber in the line that is applicable to high speed, high capacity transmission system is provided, as DCTF, this optical fiber can be realized full remuneration at C-band at least to positive dispersion commonly used and positive dispersion slope single-mode fiber, and well balance useful area, dispersion characteristics and attenuation characteristic and make this optical fiber have good counter-bending characteristic, welding characteristic and anti-hydrogen loss characteristic etc.In addition, for this optical fiber, when paying attention to the fibre-optic waveguide structural design, also strengthened the design of material The Nomenclature Composition and Structure of Complexes.For DCTF, by the optimal design of section refractive index and reasonably material The Nomenclature Composition and Structure of Complexes design, can obtain the optical fiber of low attenuation, low PMD and low nonlinearity coefficient, be used with Transmission Fibers with positive dispersion and positive dispersion slope, both can play the effect of dispersion compensation, itself has increased the transmission length of system again.
Waveguiding structure design for this optical fiber, technical scheme of the present invention is as follows: design a kind of single mode waveguide structure, it has a segmented core and a layering covering, fibre core is provided with the fibre core layering that two different refractivities distribute, covering includes five covering layerings, the scope of the refractive indices Core1% of the described fibre core first fibre core layering Core1 is 0.85% to 1.30%, and the scope of external diameter Ф Core1 is 3.2 μ m to 4.2 μ m; The scope of the second fibre core layering refractive indices Core2% is 0.50% to 1.30%, and the scope of external diameter Ф Core2 is 3.5 μ m to 5.8 μ m; The first covering layering Clad1, the scope of its refractive indices Clad1% is-0.50% to-0.30%, the scope of external diameter Ф Clad1 is 7.5 μ m to 12.5 μ m; The scope of the refractive index contrast Δ Clad2% of the second covering layering Clad2 is 0.15% to 0.35%, and the scope of external diameter Ф Clad2 is 11.0 μ m to 18.0 μ m; The scope of the refractive index contrast Δ Clad3% of triple clad layering Clad3 is about-0.2% to 0%, and the scope of external diameter Ф Clad3 is 18.0 μ m to 25.0 μ m; The 4th covering layering and the 5th covering are layered as pure silicon dioxide glass, and its refractive index is the pure silicon dioxide glass refraction.
Material The Nomenclature Composition and Structure of Complexes design for this optical fiber, followed the theory of Functionally Graded Materials, in order to realize designed index distribution, thereby the quartz glass of plug for mixing, by setting proper formula, make the footpath of plug xsect upwards have continuous The Nomenclature Composition and Structure of Complexes graded, therefore and make the character gradual change of material, make no tangible interface in the prefabricated rods, when making each layer viscosity coupling, thermal stress obtains relaxing, thereby in the subsequent technique that optical fiber is made, just can residual thermal stress in the optical fiber and produce scission of link, thus the attenuation of optical fiber reduced, optimized PMD, warpage, characteristic such as welding and improved its anti-hydrogen loss characteristic.The structural design of a plurality of sandwich layers and a plurality of coverings makes the design of material design and waveguiding structure can reach harmonious unification.The composition of material is as shown in table 1.
Table 1
| The position | Core1 | Core2 | Clad1 | Clad2 | Clad3 | Clad4 | Clad5 |
| Form | SiO 2-GeO 2-F | SiO 2-F | SiO 2-GeO 2-F | SiO 2 | |||
Material is formed peaceful, Core1,2, Clad1-4 is for the low-temperature plasma chemical vapor deposition method is that PCVD technology obtains, and has micro-Cl to introduce in the course of reaction.The temperature and the high frequency power of ratio, holding furnace that contains Cl amount and oxygen and SiGe material is relevant; Clad5 makes for adopting OVD technology, wherein also has micro-Cl to adopt Cl in sintering process
2Deng introducing as dewatering agent.Cl also can reduce the viscosity of quartz glass, thereby can reduce wire-drawing temperature, is useful to the decay that reduces optical fiber.To this, detailed introduction is arranged in patent US005740297/CN1087432C, do not belong to the present invention and consider content.
Aspect the material composition, be not to select single doping for use, but make full use of the advantage of PCVD technology just to obtaining designed waveguiding structure, adopt the codeposition of fluorine and germanium.Introduce GeO
2Be in order to increase refractive index, introduce fluorine except the effect of landing low-refraction, also can reduce the water peak, this is because under the high frequency effect, and the raw material that feeds in the quartz ampoule all can become plasma, and wherein hydrogeneous material is (as H
2O, CH
4, SiHCl
3Deng) become hydrogen ion, as follows:
Fluorine Lyons is (as C in plasma atmosphere
2F
6) can hydrogen be removed by following reaction, thereby to reduce the water peak:
Thereby when mixing germanium, mix the attenuation that fluorine can be optimized optical fiber.Secondly, owing to mix the thermal expansivity that germanium has increased glass, adopt the codeposition of fluorine and germanium, make F and Ge distribution gradient on the section of optical fiber, in optical fiber, just do not have tangible interface like this, in drawing process, just can residual thermal stress in the optical fiber, the internal stress in the optical fiber is except being to produce in the single-mode fiber the immanent cause of PMD, remaining thermal stress in the optical fiber, also can increase scattering of light, thereby increase the attenuation of optical fiber.
Between each layer, mix, make the viscosity of each layer approaching as far as possible, promptly mate mutually by adjusting.This also is of the present invention one big characteristics.For mixing fluorine F and germanium dioxide GeO
2Quartz glass, the relation of viscosity and temperature is as follows:
logη＝K
0+K
FΔ
F+K
GeO2Δ
GeO2 K
0＝log[η
SiO2(T)] (1)
In the formula (1), η is the viscosity of doped silica glass, Δ
F, Δ
GeO2Be respectively fluorine F and germanium dioxide GeO
2The relative difference of the variations in refractive index that is produced, K
F, K
GeO2Be respectively the constant of positive and negative; T is a temperature ℃, η
SiO2Viscosity for pure quartz glass.
Mixing germanium can increase the refractive index of quartz glass, mixes the refractive index that fluorine can reduce quartz glass, thereby can obtain designed waveguiding structure by mixing germanium and fluorine.In order to realize designed optical fibre refractivity section, thereby outwards must adopt different dopings from the optical fiber fuse.By formula (1) as can be known, fluorine and germanium all reduce the viscosity of quartz glass, if adopt single doping, must cause in optical fibre refractivity variation zone greatly, and the viscosity of glass also will change a lot, even undergo mutation.In addition, because the difference that material is formed, each layer will have different physical propertys, as the softening temperature of expansion coefficient, thermal capacitance and glass etc., thereby in follow-up drawing process since the speed difference of heating and cooling cause can unrelieved stress in the optical fiber.Definition from viscosity, the viscosity that is understood that glass is very big to the drawing tensile force influence, particularly the viscosity of each " layer " differs greatly in optical fiber, when not matching mutually, in drawing process, can produce glass defect, as scission of link, not only can increase the decay of optical fiber, the environmental characteristics of optical fiber is worsened.Core1 when embodiment optical fiber, 2 and Clad1,2 viscosity differ greatly, and by formula 1 calculate, in the time of 1950 ℃, log η differs 0.23, optical fiber hydrogen loss test result as shown in Figure 3, the additional attenuation that causes at 1530nm is greater than 0.01dB/km, the environmental characteristics that this optical fiber is described is relatively poor, and the 1530nm absorption peak of Si-H key just illustrates because not matching of viscosity produced scission of link in drawing process.After adjust mixing, by formula 1 calculate, in the time of 1950 ℃, log η differs less than 0.1, and not only optical fiber is reduced to 0.247dB/km in 1550 decay by 0.275dB/km, and the hydrogen loss test result is less than 0.01dB/km, as shown in Figure 4.
Mix fluorine F and germanium dioxide GeO by adjustment
2Relative content, when obtaining designed waveguiding structure, the viscosity of each layer is mated mutually, reduced drawing tensile force, reduced caused unrelieved stress of drawing process and scission of link, thereby reached the purpose of optimizing the every characteristic of optical fiber.At the center of optical fiber, refractive index is the highest, thereby mixes germanium amount maximum, in order to reduce the water peak to optimize decay, need certain fluorine amount of mixing, thereby viscosity is lower,, mixes by adjusting for this reason, and the viscosity of optical fiber is increased from inside to outside gradually.In addition, suitably increase the fluorine amount of mixing, the characteristic of utilizing fluorine to be easy to spread, make optical fiber in drawing process, further form more reasonably gradient, although trickle change can take place the refractive index profile of optical fiber simultaneously, can become the slick and sly step function in angle as intrinsic each layering step function index distribution and distribute, the not influence of transport property of optical fiber.
By the viscosity coupling, thereby improve the anti-hydrogen loss characteristic of optical fiber, also can optimize the warping characteristic of optical fiber and reduce the distortion of waveguide in the fusion process, thereby reduce the welded joint loss of optical fiber except that reducing the scission of link that produces in the drawing process.
In optical fiber, the content of Cl is very little, can ignore, and after determining to mix F, when waveguiding structure is determined, mixes GeO accordingly
2Amount also just determined (Δ GeO2%=Δ %-Δ F%), among the present invention, the doping F amount of optical fiber (in the contribution margin of F) as shown in table 2.
Table 2
| The position | Core1 | Core2 | Clad1 | Clad2 | Clad3 | Clad4 | Clad5 |
| Δ F％ | -0.05 ±0.01 | -0.06 ±0.01 | -0.40 ±0.10 | -0.130 ±0.05 | -0.135 ±0.05 | 0 | 0 |
Press such scheme, optical fiber of the present invention has following transport property:
In the chromatic dispersion of 1530nm to 1675nm less than-20ps/nm/km, preferably less than-30ps/nm/km; The RDS of optical fiber is 0.0030-0.0045/nm;
In the decay of 1550nm less than 0.25dB/km, preferably less than 0.22dB/km;
Cutoff wavelength is less than or equal to 1450nm in the optical cable, and the cutoff wavelength of optical fiber is less than or equal to 1700nm more than or equal to 1200nm;
Mode field diameter MFD is more than or equal to 5.60 μ m, and useful area is not less than 22 μ m
2, more preferably greater than or equal 30 μ m
2
The PMD of optical fiber is less than or equal to 0.08ps/km
1/2, preferably be less than or equal to 0.05ps/km
1/2
At Ф 60mm mandrel in the tests of 100 circles, the additional attenuation that bending causes at 1550nm and 1625nm place all less than 0.05dB, at Ф 32mm mandrel around 1 test result of enclosing less than 0.5dB;
During optical fiber self welding, average welded joint loss is less than 0.08dB;
The hydrogen loss of optical fiber is less than 0.01dB/km.
Simultaneously, the present invention has also proposed the dispersion management link section be made up of above-mentioned dispersion compensation Transmission Fibers and positive dispersion and positive dispersion slope single-mode fiber, can be used for the transmission of dwdm system.
It is PCVD technology that the present invention uses the low-temperature plasma chemical vapor deposition method, the design of bond material The Nomenclature Composition and Structure of Complexes, the section that has designed the energy steady production and controlled easily, the optical fiber of manufacturing has certain negative dispersion and negative dispersion slope at 1450-1675nm, not only have low attenuation and bigger useful area, and have lower PMD, eutectic splicing loss, counter-bending characteristic and excellent anti-hydrogen loss characteristic preferably.
Description of drawings
Fig. 1 is the schematic graph of refractive index contrast Δ % to diameter, corresponding to embodiment 1.
Fig. 2 is according to the schematic graph of another kind of refractive index contrast Δ % of the present invention to diameter, corresponding to embodiment 2.
Fig. 3 is hydrogen loss test result diagram.
Fig. 4 is hydrogen loss test result diagram.
Fig. 5 is a dispersion management link section synoptic diagram.
Fig. 6 is a dispersion management link section synoptic diagram.
Fig. 7 is the dispersion characteristics of embodiment 1,2,4 and 4.
Fig. 8 prepares synoptic diagram for the transition optical fiber prefabricated rods.
Fig. 9 is a profile of optic fibre viscosity profile synoptic diagram.
Embodiment
According to the refractive index distribution curve of the description waveguide shown in Fig. 1,2, with the relative index of refraction value of i layering of Δ Corei% (i=1,2) expression sandwich layer, the diameter of i layering of Ф Corei (i=1,2) expression sandwich layer; The relative index of refraction value of i layering of Δ Cladi% (i=1,2,3,4) expression covering, the diameter of i layering of Ф Cladi (i=1,2,3,4,5) expression covering.Wherein the 4th and the 5th covering is layered as the pure silicon dioxide glassy layer.
Embodiment 1-2:
Table 3 classify is by one group of index distribution of Fig. 1, and gained optical fiber main performance sees Table 5.
Table 3
| ΔCore1 ％ | ΔCore2 ％ | ΔClad1 ％ | ΔClad2 ％ | ΔClad3 ％ | ФCore1 | ФCore2 | | ФClad2 | ФClad3 | ||
| 1 | 1.25 | 0.60 | -0.38 | 0.33 | -0.020 | 3.85 | 4.60 | 10.5 | 16.6 | 22 | |
| 2 | 0.84 | 0.58 | -0.43 | 0.24 | -0.015 | 3.42 | 3.86 | 8.76 | 12.81 | 19 |
Embodiment 3-4:
Table 4 classify is by second group of index distribution of Fig. 2, and gained optical fiber the results are shown in Table shown in 5.
Table 4
| ΔCore1 ％ | ΔCore2 ％ | ΔClad1 ％ | ΔClad2 ％ | ΔClad3 ％ | Ф Core1 | Ф Core2 | Ф Clad1 | Ф Clad2 | Ф Clad3 | |
| 3 | 0.98 | 0.98 | -0.36 | 0.30 | -0.005 | 3.60 | 4.80 | 10.6 | 16.7 | 25 |
| 4 | 0.95 | 0.95 | -0.36 | 0.29 | -0.020 | 3.65 | 4.65 | 10.5 | 16.5 | 25 |
The main optical parametric of above-mentioned 4 embodiment is as shown in table 5, and its dispersion characteristics as shown in Figure 7.
Table 5
| The optical parametric of 1550nm | Cutoff wavelength (nm) | Macrobend Ф 60mm | Macrobend Ф 32mm | |||||
| Chromatic dispersion (ps/nm/km) | Chromatic dispersion gradient (ps/nm 2/km) | RDS (1/nm) | MFD (μm) | Decay (dB/km) | ||||
| 1 | -42.1 | -0.1286 | 0.00305 | 5.67 | 0.247 | 1571 | 0.030dB | 0.070dB |
| 2 | -28.7 | -0.0861 | 0.00300 | 5.61 | 0.228 | 1465 | 0.032dB | 0.025dB |
| 3 | -21.0 | -0.0913 | 0.00435 | 5.84 | 0.232 | 1486 | 0.007dB | 0.020dB |
| 4 | -31.3 | -0.1112 | 0.00355 | 5.75 | 0.241 | 1532 | 0.019dB | 0.023dB |
To the foregoing description optical fiber, by adjust mixing, guarantee the viscosity coupling after, the hydrogen loss of institute's photometry fibre is all less than 0.01dB/km.Carry out constituent analysis by the section to optical fiber, calculate in conjunction with section refraction index test and formula (1), the viscosity profile trend on the profile of optic fibre as shown in Figure 9.
For the foregoing description optical fiber, carry out welding with the FSU975 of Ericsson, during self welding, test surpassing 100 welded joints, the result shows that the welded joint loss can be controlled at below the 0.08dB; During with fused fiber splice G.652, the welded joint loss is about 0.6dB, and is best less than 0.3dB.
For the doping of the foregoing description optical fiber, self welding test result and as shown in table 6 greater than 10 times hydrogen loss test result.
Table 6
| The contribution margin of F | Average self splice loss, splice attenuation (dB) | Hydrogen loss (dB/km) | |||||
| Core1 | Core2 | Clad1 | Clad2 | Clad3 | |||
| 1 | -0.050 | -0.080 | -0.34 | -0.125 | -0.135 | 0.059 | 0.007 |
| 2 | -0.065 | -0.075 | -0.43 | -0.135 | -0.140 | 0.065 | 0.005 |
| 3 | -0.055 | -0.06→-0.20 | -0.36 | -0.130 | -0.135 | 0.045 | 0.003 |
| 4 | -0.060 | -0.07→-0.20 | -0.36 | -0.130 | -0.135 | 0.048 | 0.001 |
In addition, adjust the PCVD technological parameter in conjunction with the HF acid corrosion, prepare G.652 plug and this fibre-optical mandrel of the present invention that diameter is 20 ± 0.05mm, be cut to the long junior unit of 3-8cm, section is polished, intersect behind the cleaning-drying then that to place internal diameter be that 20.5 ± 0.1mm, wall thickness are in the purity quartz glass pipe for high of 2.5mm, the bottom is fixed, the sectional area of packing into is 2450mm
2Sleeve pipe in, on the stretched vertically tower, vacuumize on one side and bottom-up be stretched into the prefabricated rods that diameter is 50mm on one side with the molten post-tensioning that contracts of stretching device from the upper end, as shown in Figure 8, in fiber drawing furnace, be drawn into optical fiber again, determine joint location with OTDR, the optical fiber that will contain joint filters out, and then this optical fiber is transition optical fiber.With the transition optical fiber that the method obtains, the joint does not have the fluctuation of silk footpath, in the average splicing loss of 1550nm less than 0.24dB, the best 0.14dB that is less than or equal to.
Simultaneously, the present invention has also proposed the dispersion management link section be made up of above-mentioned dispersion compensation Transmission Fibers and positive dispersion and positive dispersion slope single-mode fiber, can be used for the transmission of dwdm system.Scheme has two:
Scheme one: the form that does not adopt transition optical fiber or optical cable, because mode field diameter MFD and index distribution is different, this optical fiber is during respectively with the welding of positive dispersion single-mode fiber, the welded joint loss is bigger, as with conventional single-mode fiber G.652 during welding, in the average welded joint loss of 1550nm up to 0.60dB.Though the welded joint loss is very high,, also still be acceptable because this continues and only take place twice in an amplifier spacing.As shown in Figure 5: circuit 1 is positive dispersion and positive dispersion slope single-mode fiber or optical cable, and circuit 2 is above-mentioned dispersion compensation transmission single-mode fiber or optical cable.
Scheme two: adopt the form of transition optical fiber or optical cable, its advantage is to greatly reduce splicing loss.The preparation transition optical fiber is earlier with dispersion compensation single-mode fiber of the present invention prefabricated rods unit with the positive dispersion single-mode fiber prefabricated rods unit of diameter core being docked, and then wire drawing, the optical fiber that comprises joint is transition optical fiber, a distinguishing feature of this transition optical fiber is, the splicing loss of joint is reduced to below the 0.3dB, add two welded joint losses of two ends optical fiber self welding, total splice loss, splice attenuation can reduce 0.2dB than scheme one; Simultaneously, because the tensile strength of its joint adopts the big of welding process, thereby the bridge fibre of this transition optical fiber except can be used as welding the time, but stranding also becomes the part of transmission link.As shown in Figure 6: circuit 1 is positive dispersion and chromatic dispersion gradient single-mode fiber or optical cable, and circuit 2 is transition optical fiber or optical cable, and circuit 3 is above-mentioned dispersion compensation transmission single-mode fiber or optical cable.
The present invention is not limited to embodiment, every optical fiber with positive dispersion and positive dispersion slope, as long as dispersion slope compensation ratio (DSCR) satisfies the requirement of system design, all can select corresponding dispersion compensation transmission single-mode fiber of the present invention and its composition chromatic dispersion link management for use.
Claims (6)
1, a kind of dispersion compensation Transmission Fibers, its waveguiding structure has segmented core and layering covering, fibre core is provided with the fibre core layering that two different refractivities distribute, the layering covering includes five covering layerings, it is characterized in that segmented core and layering cladding structure pass is: the optical fiber innermost layer is the first fibre core layering, be followed successively by the second fibre core layering, the first covering layering, the second covering layering, the triple clad layering, the 4th covering layering, the 5th covering layering, the scope of the refractive indices Core1% of the described fibre core first fibre core layering Core1 is 0.85% to 1.30%, and the scope of external diameter Φ Core1 is 3.2 μ m to 4.2 μ m; The scope of the second fibre core layering refractive indices Core2% is 0.50% to 1.30%, and the scope of external diameter Φ Core2 is 3.5 μ m to 5.8 μ m; The first covering layering Clad1, the scope of its refractive indices Clad1% is-0.50% to-0.30%, the scope of external diameter Φ Clad1 is 7.5 μ m to 12.5 μ m; The scope of the refractive index contrast Δ Clad2% of the second covering layering Clad2 is 0.15% to 0.35%, and the scope of external diameter Φ Clad2 is 11.0 μ m to 18.0 μ m; The scope of the refractive index contrast Δ Clad3% of triple clad layering Clad3 is-0.2% to 0%, and the scope of external diameter Φ Clad3 is 18.0 μ m to 25.0 μ m; The 4th covering layering and the 5th covering are layered as pure silicon dioxide glass, and its refractive index is the pure silicon dioxide glass refraction, refractive indices %=[(n
1-n
c)/n
c] * 100%, wherein n
1Be fiber core refractive index, n
cBe cladding index.
2, dispersion compensation Transmission Fibers according to claim 1 is characterized in that the composition of the described fibre core first fibre core layering Core1, the second fibre core layering Core2, the second covering layering Clad2, triple clad layering Clad3 is SiO
2-GeO
2-F, the composition of the first covering layering Clad1 is SiO
2-F, the composition of the 4th covering layering Clad4 and the 5th covering layering Clad5 is SiO
2
3, dispersion compensation Transmission Fibers according to claim 2, it is characterized in that Δ F%=-0.05 ± 0.01 among the described fibre core first fibre core layering Core1, Δ F%=-0.06 ± 0.01 among the fibre core second fibre core layering Core2, Δ F%=-0.40 ± 0.10 among the first covering layering Clad1, Δ F%=-0.130 ± 0.05 among the second covering layering Clad2, Δ F%=-0.135 ± 0.05 among the triple clad layering Clad3, Δ F% is the contribution margin in refractive index.
4, according to the described dispersion compensation Transmission Fibers of one of claim 2-3, it is characterized in that the coupling of the viscosity between each layer in the optical fiber, just on profile of optic fibre from inside to outside viscosity increase gradually or be approaching as far as possible, viscosity is sudden change not.
5, dispersion compensation Transmission Fibers according to claim 4 is characterized in that described optical fiber is-42.1--21.0ps/nm/km that the relative dispersion slope RDS of optical fiber is 0.0030-0.00435/nm in the chromatic dispersion of 1530nm to 1675nm; At the 0.228-0.247dB/km that decays to of 1550nm, mode field diameter MFD is 5.61-5.84 μ m, and the polarization of optical fiber is touched chromatic dispersion PMD and is less than or equal to 0.08ps/km
1/2, in the test of 100 circles, the additional attenuation that bending causes is 0.007-0.032dB at 1550nm and 1625nm place at Φ 60mm mandrel, is 0.02-0.07dB at Φ 32mm mandrel around the test result of 1 circle; Cutoff wavelength 1465-1571nm in the optical cable; During optical fiber self welding, average welded joint loss is 0.045-0.065dB; The hydrogen loss of optical fiber is 0.001-0.007dB/km.
6, the purposes of dispersion compensation Transmission Fibers according to claim 5 is characterized in that the dispersion compensation Transmission Fibers is become link with the optical fibre set with positive dispersion and positive dispersion slope, is used for the transmission of dense wave division multipurpose dwdm system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031283217A CN1252498C (en) | 2003-07-15 | 2003-07-15 | Dispersion compensating transmission optical fiber matched with orthochromatic dispersion and ortho chromatic dispersion slope unimodel optical fiber and use |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031283217A CN1252498C (en) | 2003-07-15 | 2003-07-15 | Dispersion compensating transmission optical fiber matched with orthochromatic dispersion and ortho chromatic dispersion slope unimodel optical fiber and use |
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| CN1514262A CN1514262A (en) | 2004-07-21 |
| CN1252498C true CN1252498C (en) | 2006-04-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011088706A1 (en) * | 2010-01-20 | 2011-07-28 | 长飞光纤光缆有限公司 | High bandwidth multimode fiber |
| CN109983379A (en) * | 2016-11-25 | 2019-07-05 | 住友电气工业株式会社 | Fibre circuit and fibre circuit manufacturing method |
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| CN1300607C (en) * | 2004-12-20 | 2007-02-14 | 烽火通信科技股份有限公司 | Bending insensitive optical fiber and preparing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011088706A1 (en) * | 2010-01-20 | 2011-07-28 | 长飞光纤光缆有限公司 | High bandwidth multimode fiber |
| CN109983379A (en) * | 2016-11-25 | 2019-07-05 | 住友电气工业株式会社 | Fibre circuit and fibre circuit manufacturing method |
| CN109983379B (en) * | 2016-11-25 | 2021-04-27 | 住友电气工业株式会社 | Optical fiber circuit and method for manufacturing optical fiber circuit |
| US20220091328A1 (en) * | 2019-10-29 | 2022-03-24 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Low-dispersion single-mode optical fiber |
| US11435519B2 (en) * | 2019-10-29 | 2022-09-06 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Low-dispersion single-mode optical fiber |
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