CN101373237B - Single-mode optical fiber optimizing dispersion characteristic - Google Patents
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- CN101373237B CN101373237B CN200710070981A CN200710070981A CN101373237B CN 101373237 B CN101373237 B CN 101373237B CN 200710070981 A CN200710070981 A CN 200710070981A CN 200710070981 A CN200710070981 A CN 200710070981A CN 101373237 B CN101373237 B CN 101373237B
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- 239000006185 dispersion Substances 0.000 title claims abstract description 114
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000012792 core layer Substances 0.000 claims abstract description 11
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- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 229910052732 germanium Inorganic materials 0.000 claims description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 2
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Abstract
A single-mode optical fiber for optimizing dispersion characteristic belongs to the optical communication technology, and solves the problem of the nonlinearity and polarized mode dispersion influencing the high-speed communication in the prior art. The single-mode optical fiber comprises a first layer and a second layer which form the optical fiber core layer, and a third layer, a fourth layer and an outer cladding which form the fiber cladding, wherein the refractive index of the first layer is in step-shaped distribution; the refractive index of the second layer is in ladder-shaped distribution; the refractive indexes of the third and the fourth layers are in sep-shaped distribution; the outer cladding is the pure silicon dioxide glass cladding; the refractive index distribution of the optical fiber core layer is that n1 is larger than n2, and n2 is larger than nc; the refractive index distribution of the optical fiber cladding is that n4 is larger than nc, and nc is larger than n3, wherein ni is the refractive index of the optical fiber of the (i)th layer; and nc is the refractive index of the outer cladding. The single-mode optical fiber has a lower dispersion slope, a proper dispersion area and a proper effective area; and the single-mode optical fiber has the advantages of low polarization mode dispersion, low loss, excellent anti-bending property and low fusion loss when fusing with the optical fiber so that the single-mode optical fiber is applicable to the high-capacity, high-speed and long-distance DWDM system transmission.
Description
Technical field
The invention belongs to optical communication technique, be specifically related to a kind of non-zero dispersion displacement single mode optical fibre that designs for high capacity, two-forty, long haul transmission system.This single-mode fiber has the dispersion characteristics of optimization, be suitable chromatic dispersion and lower chromatic dispersion gradient, useful area is moderate, have simultaneously that polarization mode dispersion is low, low-loss and excellent bending resistance, have advantages such as low welding loss during with fused fiber splice, be applicable to the dwdm system transmission of high capacity, two-forty, long distance, its low chromatic dispersion gradient helps accurately management is carried out comprehensively in chromatic dispersion, moderate significant surface helps obtaining high Raman and amplifies efficient, satisfies the transmission of the long distance of C, C+L wave band.
Background technology
Along with the maturation of the development of Fibre Optical Communication Technology, particularly fiber amplifier and wavelength-division multiplex technique is used, what restrict optical fiber communication no longer is the loss of optical fiber.The fast development of global IT application needs high capacity, two-forty optical fiber telecommunications system.From technology and consideration economically, the Fibre Optical Communication Technology development mainly is divided into 2 directions, promptly improves the single-channel transfer rate of wavelength-division multiplex, and the channel quantity that increases wavelength-division multiplex transmits wave band with increase.Therefore high capacity, two-forty, long haul transmission system propose new requirement to the characteristic and the development of optical fiber.For wavelength-division multiplex technique, the principal element of restriction Optical Fiber Transmission capacity and distance is a nonlinear effect, chromatic dispersion and Optical Signal To Noise Ratio OSNR at present.
In wavelength-division multiplex system, along with capacity increases, constantly reduce the wavelength interval, and the optical nonlinear effect between each wavelength comprises four-wave mixing, from phase modulation (PM), cross-phase modulation etc., has limited the capacity and the distance of light transmission.Therefore the Optical Signal To Noise Ratio of system requirements requires higher signal light power along with single-channel speed improves and the increase that is directly proportional, and this makes fiber nonlinear effect more become serious.And because the wavelength division multiplexed channel band extension, the chromatic dispersion accumulation of length wavelength edges channel makes dispersion management complicated more, has increased system dispersion compensation cost.The effective way that the addresses these problems optical fiber technology of constantly bringing forth new ideas exactly, exploitation has the new optical fiber of optimizing dispersion characteristics.
In order to suppress effect of nonlinear in the dwdm system, need suitable dispersion values and reduce optical power density at the transmission wave band, people have developed non-zero dispersion displacement optical fiber (NZ-DSF, G.655 optical fiber) and large effective area non-zero dispersion displacement optical fiber on the basis of dispersion shifted optical fiber.The design and the production patent of a series of this type optical fiber have been announced at present.Announced a kind of large effective area non-zero dispersion displacement optical fiber and manufacture method as Chinese ZL98121639.0 patent of invention (Granted publication number for CN1068434C), its typical chromatic dispersion gradient is 0.09ps/ (nm
2Km), useful area is at 80um
2More than, 1550nm loss representative value is 0.205dB/km.China's ZL03125210.9 patent of invention (Granted publication number be CN1219227C) has been announced a kind of positive non-zero dispersion displacement optical fiber, and design has 8 fibre core layerings, and the 1550nm chromatic dispersion gradient is reduced to 0.085ps/ (nm
2Km), useful area is adjusted into 70um
2More than, the chromatic dispersion of 1530-1550nm scope is at 2.0-6.0ps/ (nmkm), and the loss of 1550nm is less than 0.21dB/km.The triangular form design optical fiber that sink in a kind of has been announced in No. 00806764.3 application for a patent for invention of China (publication number is CN1348548A), and chromatic dispersion gradient is 0.073ps/ (nm
2Km).United States Patent (USP) 6396987B1 has announced a kind of optical fiber, and the fiber core layer refractive index adopts distribution trapezoidal and the sagging step change type in center, and its chromatic dispersion gradient is less than 0.073ps/ (nm
2Km), useful area reaches 60um
2A kind of step change type index distribution optical fiber has been announced in No. 00802639.4 application for a patent for invention of China (publication number is CN1337010A), and chromatic dispersion gradient is also less than 0.07ps/ (nm
2Km), the chromatic dispersion of 1550nm is at 7-15ps/ (nmkm).
Though G.655 the optical fiber kind is numerous now, in the most G.655 optical fiber, chromatic dispersion gradient still is bigger than normal, and dispersion characteristics are unbalanced, and perhaps waveguiding structure is too complicated, actually is unfavorable for controlling of production process and obtains high yield rate.In the former technological operation, it is big and chromatic dispersion is higher to be used for the chromatic dispersion gradient of large effective area fiber of long haul transmission system, therefore causes the dwdm system performance degradation.Transmission system for wide operation wavelength, chromatic dispersion gradient direct harm bigger than normal is exactly to cause the chromatic dispersion difference of length wavelength side bandgap wavelength big, the transmission wavelength scope is wide more, this difference is big more, the increase of dispersion compensation difficulty or cost is big more, requires the high speed transmission system of accurate dispersion management like this for 40Gbit/s, and its influence just becomes very big problem, still need complicated dispersion management in actual applications, increased system cost.Along with the application of raman amplifier, the Raman gain characteristic of non-zero dispersion displacement optical fiber also more and more comes into one's own.The raman gain efficiency of optical fiber and useful area are similar to inverse relation, and big useful area means low raman gain efficiency.Therefore, for making full use of the bandwidth of an optical fiber resource, increase message capacity, and adapt to applying of distributed raman amplifier transmission system, require optical fiber to have balanced dispersion characteristics, promptly require to reduce chromatic dispersion gradient, suppress nonlinear effect, keep the useful area of optical fiber moderate simultaneously by a suitable minimum dispersion variation.
Desirable CHROMATIC DISPERSION IN FIBER OPTICS should have a constant at whole service band, but refractive index changes along with wavelength variations, chromatic dispersion has dependence to wavelength, on the fibre-optic waveguide structural design, useful area and chromatic dispersion, chromatic dispersion gradient mutual restriction need be considered the various characteristics balance when optical fiber designs.
In actual fiber optic transmission system long haul, usually different fiber need be connected to form communication link, non-zero dispersion displacement optical fiber is more complicated than standard single-mode fiber index distribution, together the time,, often cause reflection to increase non-zero dispersion displacement optical fiber and other dissimilar fused fiber splice because long diameter of mould each other and optical fiber geometric parameter etc. do not match, added losses increase, the long more contact of link is many more, and the effect of accumulation is big more, and serious may cause the unacceptable bit error rate.Therefore the welding characteristic is the problem that can not be ignored in the optical fiber manufacturing, need take measures to reduce the splice loss, splice attenuation of optical fiber, and the restriction splice loss, splice attenuation is to the illeffects of transmission system.
Summary of the invention
Technical matters to be solved by this invention is to overcome nonlinear problem and the polarization mode dispersion problem that prior art influences high-speed communication, and a kind of non-zero dispersion displacement single mode optical fibre that is applicable to high capacity, two-forty, long haul transmission system is provided.Give the dispersion characteristics that this single-mode fiber is optimized, promptly lower chromatic dispersion gradient, suitable dispersion values and useful area have simultaneously that polarization mode dispersion is low, low-loss and excellent bending resistance and a welding performance, thereby effectively reduce the dispersion compensation cost.For this reason, the present invention is by the following technical solutions:
A kind of single-mode fiber of optimizing dispersion characteristics, it is characterized in that it comprises the ground floor that constitutes fiber core layer, the second layer and constitute the 3rd layer of fibre cladding, the 4th layer, surrounding layer, this ground floor, the second layer, the 3rd layer, the 4th layer, surrounding layer sets gradually from inside to outside, ground floor is step distribute (step be distributed in show as on the distribution curve of refractive index to diameter step-like) to the refractive index of the second layer, second layer refractive index gradient changes (graded shows as oblique line shape on the distribution curve of refractive index to diameter), the 3rd layer to the 4th layer refractive index, the 4th layer of refractive index to surrounding layer is that step distributes, surrounding layer is pure silica glass covering, the index distribution of described fiber core layer is n1＞n2＞nc, and the index distribution of described fibre cladding is n4＞nc＞n3; Wherein ni is the optical fibre refractivity of i layer, and nc is the refractive index of surrounding layer;
The waveguiding structure parameter of four layerings of optical fiber is:
0.34％≤Δn1≤0.46％， 5.0um≤r1≤7.0um；
0.25％≤Δn2≤0.35％， 6.0um≤r2≤8.0um；
-0.15％≤Δn3≤-0.01％，10.5um≤r3≤14.5um；
0.07％≤Δn4≤0.12％， 10.66≤r4≤18.66um；
Wherein Δ ni is with the refractive index contrast of nc as the i layer of reference refractive index, and ri is the radius of i layer.
In the second layer diameter that constitutes fiber core layer and the Gradient distribution of refractive index, obtain suitable chromatic dispersion and useful area.At the 3rd layer the refraction index changing chromatic dispersion gradient that constitutes fibre cladding.
As the further of technique scheme improved and replenish, the present invention also comprises following additional technical feature:
Mix germanium, fluorine, phosphorus in the 3rd layer, the 4th layer of formation fibre cladding, in order to the index distribution of adjusting optical fiber product, and make viscosity and stress coupling, reduce unrelieved stress in the optical fiber, equilibrium stress distributes, stable fiber polarization mode dispersion performance.Obtain the improvement of the welding performance of optical fiber simultaneously, obtain low splice loss, splice attenuation.
By accurate adjustment to Refractive Index Profile o, can obtain the dispersion characteristics that need, i.e. dispersion values, chromatic dispersion gradient and suitable useful area, and have lower PMD and low-loss, excellent bending property and welding performance.According to such scheme, single-mode fiber of the present invention has following feature:
1550nm chromatic dispersion gradient≤0.05ps/ (nm
2Km),
Zero-dispersion wavelength≤1460nm,
Useful area 55-65um
2,
Chromatic dispersion in the 1530nm-1565nm scope between 2.0-6.0ps/ (nmkm),
Loss≤0.22dB/km of 1550nm.According to the fibre-optical bending performance measurement method, φ 60mm mandrel around 100 the circle tests in, the added losses that bending causes at 1550nm and 1625nm place all less than 0.05dB, at φ 32mm mandrel in the test of 1 circle, the added losses that bending causes at 1550nm and 1625nm place all less than 0.5dB.The polarization mode dispersion value of optical fiber
With the splice loss, splice attenuation of other non-zero dispersion displacement optical fiber (NZ-DSF) less than 0.05dB.
The present invention compromises to chromatic dispersion, chromatic dispersion gradient and useful area when optical fiber designs, under the prerequisite of pursuing low-dispersion slope, obtain moderate optical fiber effective area, result with the global optimization that reaches dispersion characteristics, obtain the improvement of other correlation properties simultaneously, satisfy the balanced needs of fibre-optic transmission system (FOTS), have following beneficial effect optic fibre characteristic:
1, compares with non-zero dispersion displacement single mode waveguiding structure in the past; waveguiding structure of the present invention is simple relatively; not only can obtain easily; and waveguiding structure has the dispersion characteristics of corresponding optimization in the numerical value interval of regulation; accurate control ability in conjunction with the distribution of technology refractive index such as MCVD, PCVD, OVD; carry out scale steady production and quality control easily, can obtain designed optical fiber property expeditiously.
2, the present invention takes into account the composition design of fiber optic materials in waveguide design, and viscosity and stress are optimized coupling, improves stress distribution, obtains the improvement of fiber PMD performance.
3, the characteristic of optical fiber of the present invention is enough to satisfy the requirement that suppresses nonlinear effect, is applicable to the DWDM transmission needs of C-band or C+L wave band, and reduces the system dispersion management costs.Amplify transmission system at distributed Raman simultaneously, optical fiber of the present invention has good application.
4, in the present invention by prefabricated rod cladding doping composition suitably chosen the welding performance that obtains.Can obtain low splice loss, splice attenuation when optical fiber of the present invention and other non-zero dispersion displacement optical fiber welding, obtain adaptability good between the different fiber.
Description of drawings
Fig. 1 be in the embodiment of the invention 1 the relative index of refraction Δ to the distribution curve synoptic diagram of diameter.
Fig. 2 be in the embodiment of the invention 2 the relative index of refraction Δ to the distribution curve synoptic diagram of diameter.
Fig. 3 be in the embodiment of the invention 3 the relative index of refraction Δ to the distribution curve synoptic diagram of diameter.
Embodiment
The present invention will be further described with embodiment below in conjunction with accompanying drawing.
Embodiment 1:
Adopt MCVD (improved chemical vapor deposition) technology to make fiber core layer, adopt OVD (outside vapour deposition) technology to make fibre cladding, according to fibre-optic waveguide refractive index distribution curve shown in Figure 1, following is one group of refractive index contrast distribution parameter:
The parameter of the first fibre core layering Core1 is: Δ n1 is about 0.45%, and r1 is about 6.0um,
The parameter of the second fibre core layering Core2 is: Δ n2 is about 0.35%, and r2 is about 7.3um,
The parameter of the first covering layering Clad1 is: Δ n3 is about-0.14%, and r3 is about 10.8um,
The parameter of the second covering layering Clad2 is: Δ n4 is about 0.12%, and r4 is about 18.5um,
The outermost layer covering is layered as the pure silicon dioxide glassy layer.
The characteristic of gained optical fiber is as follows:
1550nm useful area: 58um
2,
Zero-dispersion wavelength: 1460nm,
1550nm chromatic dispersion: 4.0ps/ (nmkm),
At the 1550nm chromatic dispersion gradient: 0.046ps/ (nm
2Km),
Fiber cut off wavelength: 1480nm,
At 1550 losses: 0.20dB/km,
The polarization mode dispersion value
Macrobend φ 60mm is around 100 circles, at the maximal value of the added losses of 1550nm and 1625nm: 0.01dB.
Macrobend φ 32mm is around 1 circle, at the maximal value of the added losses of 1550nm and 1625nm: 0.015dB.
This single-mode fiber characteristic at the chromatic dispersion gradient of 1550nm less than 0.049ps/ (nm
2Km), useful area is moderate, and decay and bending property excellence, with the splice loss, splice attenuation of other non-zero dispersion displacement optical fiber (NZ-DSF) less than 0.05dB.
Embodiment 2:
Adopt PCVD (PCVD) technology to make fiber core layer, adopt OVD technology to make fibre cladding,, classify one group of refractive index contrast distribution parameter down as according to fibre-optic waveguide refractive index distribution curve shown in Figure 2:
The parameter of the first fibre core layering Core1 is: Δ n1 is about 0.44%, and r1 is about 6.2um,
The parameter of the second fibre core layering Core2 is: Δ n2 is about 0.36%, and r2 is about 7.3um,
The parameter of the first covering layering Clad1 is: Δ n3 is about-0.15%, and r3 is about 10.8um,
The parameter of the second covering layering Clad2 is: Δ n4 is about 0.12%, and r4 is about 18.5um,
The parameter of triple clad layering Clad3 is: Δ n5 is about-0.04%, and r5 is about 28.5um,
The outermost layer covering is layered as the pure silicon dioxide glassy layer.
The characteristic of gained optical fiber is as follows:
1550nm useful area: 62um
2,
Zero-dispersion wavelength: 1430nm,
At 1550nm chromatic dispersion: 4.0ps/ (nmkm),
At the 1550nm chromatic dispersion gradient: 0.048ps/ (nm
2Km),
Optical fiber is by wavelength: 1480nm,
At 1550 losses: 0.20dB/km,
The polarization mode dispersion value
Macrobend φ 60mm is around 100 circles, at the maximal value of the added losses of 1550nm and 1625nm: 0.01dB.
Macrobend φ 32mm is around 1 circle, at the maximal value of the added losses of 1550nm and 1625nm: 0.015dB.
This embodiment gained single-mode fiber characteristic at the chromatic dispersion gradient of 1550nm less than 0.05ps/ (nm
2Km), useful area is moderate, and decay and bending property excellence, with the splice loss, splice attenuation of other NZ-DSF optical fiber less than 0.048dB.
Embodiment 3:
Adopt OVD technology to make fiber core layer, adopt OVD technology to make fibre cladding,, classify one group of refractive index contrast distribution parameter down as according to fibre-optic waveguide refractive index distribution curve shown in Figure 3:
The parameter of the first fibre core layering Core1 is: Δ n
1Be about 0.44%, r1 is about 6.0um,
The parameter of the second fibre core layering Core2 is: Δ n
2Be about 0.35%, r2 is about 7.3um,
The parameter of the first covering layering Clad1 is: Δ n
3Be about-0.15%, r3 is about 10.8um,
The parameter of the second covering layering Clad2 is: Δ n
4Be about 0.06%, r4 is about 12.5um,
The parameter of triple clad layering Clad3 is: Δ n
5Be about 0.12%, r5 is about 18.5um,
The parameter of the 4th covering layering Clad4 is: Δ n
6Be about 0.01%, r6 is about 28.5um,
The outermost layer covering is layered as the pure silicon dioxide glassy layer.
The characteristic of gained optical fiber is as follows:
1550nm useful area: 65um
2,
Zero-dispersion wavelength: 1460nm,
At 1550nm chromatic dispersion: 4.0ps/ (nmkm),
At the 1550nm chromatic dispersion gradient: 0.049ps/ (nm
2Km),
Optical fiber is by wavelength: 1480nm,
At 1550 losses: 0.20dB/km,
Macrobend φ 60mm is around 100 circles, at the maximal value of the added losses of 1550nm and 1625nm: 0.01dB.
Macrobend φ 32mm is around 1 circle, at the maximal value of the added losses of 1550nm and 1625nm: 0.015dB.
The polarization mode dispersion value
This embodiment gained optic fibre characteristic at the chromatic dispersion gradient of 1550nm less than 0.050ps/ (nm
2Km), useful area is moderate, and decay and bending property excellence, with the splice loss, splice attenuation of other NZ-DSF optical fiber less than 0.045dB.
Need to prove that the present invention has carried out concrete elaboration by above three embodiment to design of the present invention, but the present invention is not limited to above three embodiment, restriction is as space is limited no longer given unnecessary details one by one in the mode of enumerating; When stating embodiment in realization, the technology that relates to is not limited to MCVD, PCVD or OVD, and also these technologies can exchange each other, can realize the fibre-optic waveguide structural design of stipulating equally.
Remarks:
It below is the definition of terms more of the present invention.
Refractive indices is defined by following equation:
Refractive index contrast Δ ni%=[(ni
2-nc
2)/2ni
2]
Wherein ni is the optical fibre refractivity of i layer, and nc is the refractive index of surrounding layer pure silicon dioxide glass part, and it is as the reference refractive index in this application.
The definition of index distribution is meant the relation of on the selected part of optical fiber refractive index n i or the relative fiber optic hub with it of Δ ni position ri (radius).
Total dispersion is defined as the algebraic sum of fiber optic materials chromatic dispersion and waveguide dispersion, and in technical field of optical fiber communication, CHROMATIC DISPERSION IN FIBER OPTICS just is meant total dispersion, and its unit is ps/ (nmkm).
Chromatic dispersion gradient is represented the correlativity of chromatic dispersion to wavelength, owing to refractive index along with wavelength variations changes, fibre-optical dispersion numerical value also changes along with wavelength variations, chromatic dispersion gradient is represented this variability, it is to be abscissa with the wavelength, dispersion values is described slope of a curve by ordinate, and its unit is ps/ (nm
2Km), its computing formula:
Ds＝dD/dλ
In wavelength-division multiplex system, if the chromatic dispersion gradient of transmission link is big, then the difference of the dispersion values between each wavelength becomes big, will reduce the transport property of system or the cost of increase dispersion compensation.
Useful area Aeff=2 π (∫ E
2Rdr)
2/ (∫ E
4Rdr)
Integration is limited to 0 to ∞ in the formula, and E is and propagates relevant electric field.
DWDM is the english abbreviation of dense wavelength division multiplexing system.
PMD is the english abbreviation of optic fiber polarization mould dispersion.
The bending resistance of optical fiber is meant the added losses under the regulation test condition.Test process is, the loss of measuring fiber under normal operation, again according to standard-required with optical fiber on mandrel, measure loss value, the difference of two kinds of measurements is the addition bend loss that bending causes.Its specified standard test condition is included on the mandrel of diameter 75mm on 100 circles and the mandrel at 32mm around 1 circle.Usually, the maximum permissive waste that bending causes is as the criterion with the annex bending loss of 1310nm and 1550nm, and unit is dB.Adopt mandrel 60mm and 32mm respectively around 100 circles and the conditioned measurement 1550nm of 1 circle and the added losses of 1625nm wavelength among the application, and get maximal value as measurement result.
Splice loss, splice attenuation is to average at 1550nm place bidirectional measurement with 0TDR.
Claims (3)
1. single-mode fiber of optimizing dispersion characteristics, it is characterized in that it comprises the ground floor that constitutes fiber core layer, the second layer and constitute the 3rd layer of fibre cladding, the 4th layer, surrounding layer, this ground floor, the second layer, the 3rd layer, the 4th layer, surrounding layer sets gradually from inside to outside, ground floor is that step distributes to the refractive index of the second layer, second layer refractive index gradient changes, the 3rd layer to the 4th layer refractive index, the 4th layer of refractive index to surrounding layer is that step distributes, surrounding layer is pure silica glass covering, the index distribution of described fiber core layer: n1＞n2＞nc, the index distribution of described fibre cladding: n4＞nc＞n3, wherein ni is the optical fibre refractivity of i layer, and nc is the refractive index of surrounding layer;
The waveguiding structure parameter of four layerings of described optical fiber is:
0.34％≤Δn1≤0.46％，5.0um≤r1≤7.0um；
0.25％≤Δn2≤0.35％，6.0um≤r2≤8.0um；
-0.15％≤Δn3≤-0.01％，10.5um≤r3≤14.5um；
0.07％≤Δn4≤0.12％，10.66≤r4≤18.66um；
Wherein Δ ni is with the refractive index contrast of nc as the i layer of reference refractive index, and ri is the radius of i layer.
2. a kind of single-mode fiber of optimizing dispersion characteristics according to claim 1 is characterized in that mixing germanium, fluorine, phosphorus in the 3rd layer, the 4th layer of fibre cladding.
3. a kind of single-mode fiber of optimizing dispersion characteristics according to claim 1 is characterized in that:
1550nm chromatic dispersion gradient≤0.050ps/ (nm
2Km),
Zero-dispersion wavelength≤1460nm,
Useful area 55-65um
2,
Chromatic dispersion in the 1530nm-1565nm scope between 2.0-6.0ps/ (nmkm),
Loss≤0.22dB/km of 1550nm, optical fiber
,
φ 60mm mandrel around the crooked added losses that cause of 100 circles at 1550nm and 1625nm place all less than 0.05dB, the added losses that φ 32mm mandrel causes around 1 circle bending at 1550nm and 1625nm place all less than 0.5dB.
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|---|---|---|---|---|
| CN102200610B (en) * | 2011-05-27 | 2012-10-17 | 成都富通光通信技术有限公司 | Dispersion optimization single-mode optical fibre for super-high-speed long-distance dense wave division multiplexing |
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| CN101373237A (en) | 2009-02-25 |
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