CN101446663B - Improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution - Google Patents
Improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution Download PDFInfo
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Abstract
The invention provides an improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution, comprising an optical fiber core layer, and a cladding covered on the optical fiber core layer; wherein, the optical fiber core layer comprises an internal core layer and an external core layer enclosing the internal core, both of which have different refractive indexes; the refractive index of the external core layer is gradually distributed; the cladding comprises an internal cladding, a ring-core cladding and an external cladding which are sequentially arranged from interior to exterior and have different refractive indexes; the external cladding layer is a pure SiO2 glass layer; the refractive index distribution of the optical fiber core layer meets the formula that n1 is more than n2 which is more than nc; the refractive index distribution of the cladding meets the formula that n4 is more than n3 which is more than nc or n4 is more than nc which is more thann3. The improved nonzero dispersion-shifted single-mode optical fiber has low nonlinear color-effect characteristic (namely large effective area), optimum dispersion and low dispersion efficiency, effectively solves the nonlinearity problem and polarization mode dispersion problem of high-speed communication, reduces the dispersion management cost and has low fusing loss, thus being applicable tolarge-capacity high-speed long-distance transmission system.
Description
Technical field
The present invention relates to a kind of non-zero dispersion displacement single mode optical fibre that designs for high capacity, two-forty, long haul transmission system.This optical fiber has improved low nonlinear effects characteristic; It is big mould field distribution (useful area); Optimize chromatic dispersion and lower chromatic dispersion gradient, have simultaneously that polarization mode dispersion is low, low-loss and an excellent bending resistance, have advantages such as low welding loss during with fused fiber splice; Be applicable to the dense wave division multipurpose dwdm system transmission of high capacity, two-forty, long distance; Big useful area helps reducing nonlinear effect, and low chromatic dispersion gradient helps chromatic dispersion is comprehensively managed, and satisfies the transmission of the long distance of C+L and S+C+L wave band.
Background technology
Development along with Fibre Optical Communication Technology; Particularly the maturation of fiber amplifier and wavelength-division multiplex technique is used; What restrict optical fiber communication no longer is the loss of optical fiber, and 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 contains 2 directions; One for improving the single-channel transfer rate of wavelength-division multiplex, two for the channel quantities that increase wavelength-division multiplex with increase service bands, so high capacity, two-forty, long haul transmission system propose new demand 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 nonlinear effect, chromatic dispersion and OSNR (English of OSNR abbreviates OSNR as) at present.
In dwdm system, along with the increase of capacity, constantly reduce thereupon the wavelength interval, and the optical nonlinear effect between each wavelength (comprise four-wave mixing, from phase modulation (PM), cross-phase modulation etc.) has limited the capacity and the distance of light transmission.Therefore the OSNR 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 expansion of wavelength division multiplexed channel wave band; Chromatic dispersion gradient causes the chromatic dispersion accumulation of long and short wavelength edges channel uneven; If this chromatic dispersion accumulation imbalance can not get good compensation; The regenerative repeating distance of the remarkable shortening of meeting system, this makes dispersion management complicated more, has increased system dispersion compensation cost.As for the 40Gbit/s system; The bandwidth of each channel reaches the nearly 0.8nm of 80GHz; Chromatic dispersion gradient becomes remarkable to the influence of each frequency component in each channel; Requirement is near 100% dispersion slope compensation efficient, and this just requires the relative dispersion slope (the English RDS of abbreviation of the relative dispersion slope of optical fiber) of optical fiber as far as possible little, and its effective method is to reduce chromatic dispersion gradient and suitably increase chromatic dispersion.The effective way that the addresses these problems optical fiber technology of constantly bringing forth new ideas exactly, the new optical fiber that exploitation has low nonlinear effects and chromatic dispersion optimized light-guide.
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 and large effective area non-zero dispersion displacement optical fiber on the basis of dispersion shifted optical fiber.The design and production patent (application) scheme of a series of this type optical fiber have been announced at present.Be applicable to the optical fiber of C+L wave band, like a kind of large effective area non-zero dispersion displacement optical fiber and manufacturing approach that No. 98121639.0 Chinese invention patent applications (publication number is CN1220402A) are announced, 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; As the patent No. be 03125210.9, Granted publication number is to design 8 fibre core layerings by the disclosed a kind of positive non-zero dispersion displacement optical fiber of Chinese invention patent of CN1219227C, the 1550nm chromatic dispersion gradient is reduced to 0.085ps/ (nm
2Km), useful area is adjusted into 70um
2More than; The optical fiber of the central concave core structure of announcing like No. 00806764.3 Chinese invention patent application (publication number is CN1348548A), the about 70um of optical fiber effective area
2, chromatic dispersion gradient is 0.09-0.08ps/ (nm
2Km); Or the like.A kind of parabolic distribution core structure optical fiber of US2002/0154876A1 U.S. Patent Application Publication, useful area is greater than 90um
2But the chromatic dispersion of 1550nm is excessive, is 14-20ps/ (nmkm); U.S. US6459839B1 patent is announced has large effective area fiber trapezoidal and the fibre core depression, and useful area reaches 100um
2More than, chromatic dispersion gradient is 0.08; A kind of optical fiber that U.S. US6396987B1 patent is announced, fiber core layer refractive index adopt distribution trapezoidal and the sagging step change type in center, and its chromatic dispersion gradient is less than 0.07ps/ (nm
2Km), but useful area only reach to 60um
2A kind of step change type index distribution optical fiber that No. 00802639.4 patented claim of China (publication number is CN1337010A) is announced, the about 0.09ps/ (nm of chromatic dispersion gradient
2Km), the chromatic dispersion of 1550nm is at 7-15ps/ (nmkm), and useful area reaches 60-150um
2The optical fiber of the sagging annular core structure of the SMIS that No. 03119080.4 patented claim of China (publication number is CN1450369A) is announced, optical fiber effective area is greater than 95um
2, chromatic dispersion gradient is less than 0.065ps/ (nm
2Km); All can be used for the S+C+L wave band, but the welding added losses of optical fiber are high.
Though G..655 optical fiber kind is numerous now, in the most large effective area G..655 optical fiber, chromatic dispersion gradient still is bigger than normal, and perhaps structure is too complicated, is unfavorable for system dispersion management and optical fiber production technology controlling and process.In the former technological operation, the chromatic dispersion gradient of large effective area fiber that is used for long haul transmission system is big, therefore causes the dwdm system performance degradation, and repeater span is limited.For the transmission system of wide operation wavelength, chromatic dispersion gradient direct harm bigger than normal is exactly to cause the chromatic dispersion difference of long and short wavelength side bandgap wavelength big, and the transmission wavelength scope is wide more; This chromatic dispersion difference is big more, and dispersion compensation difficulty and cost are big more, especially requires the High Speed System of accurate dispersion management like this for 40Gbit/s; Its influence just becomes very big problem; In practical application, need more complicated dispersion management, increased system cost, the interests that do not meet Virtual network operator are selected.Therefore, in order to make full use of the bandwidth of an optical fiber resource, to increase message capacity, these application requirements are optimized chromatic dispersion, reduce chromatic dispersion gradient, are improved the flatness of service band chromatic dispersion when keeping the large effective area characteristic.
Desirable CHROMATIC DISPERSION IN FIBER OPTICS should have a constant at whole service band, but refractive index changes along with wavelength change, and chromatic dispersion has dependence to wavelength.On the fibre-optic waveguide structural design, useful area and chromatic dispersion gradient mutual restriction need be considered the various characteristics balance when optical fiber designs.
In actual fiber optic transmission system long haul, need different fiber be connected to form communication link usually, 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 possibly 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
The purpose of this invention is to provide a kind of low nonlinearity chromatic effect characteristic that has; It is large effective area; Chromatic dispersion of optimizing and lower chromatic dispersion gradient, thus nonlinear problem and the polarization mode dispersion problem that influences high-speed communication can effectively be solved, reduce the dispersion management cost of system; And the improved non-zero dispersion displacement single mode optical fibre with big mould field distribution with low splice loss, splice attenuation is to be applicable to high capacity, two-forty, long haul transmission system.For this reason, the present invention adopts following technical scheme:
A kind of improved non-zero dispersion displacement single mode optical fibre with big mould field distribution, it comprises fiber core layer and is enclosed in the covering on the fiber core layer, it is characterized in that said fiber core layer comprises inner sandwich layer with different refractivity and the outer sandwich layer that surrounds said inner sandwich layer; The refractive index of said outer sandwich layer is a graded profile, and covering comprises inner cladding from inside to outside, ring core covering and the surrounding layer with different refractivity, and surrounding layer is the pure silicon dioxide glassy layer; The index distribution of said fiber core layer is n1>n2>nc; Said cladding index is distributed as n4>n3>nc or n4>nc>n3, wherein: n1 is the refractive index of inner sandwich layer, n2 is the largest refractive index of outer sandwich layer; N3 is the refractive index of inner cladding; N4 is the refractive index of ring core covering, and nc is the refractive index of surrounding layer, the refractive index of outer sandwich layer by the n2 gradual change to n3.
As to further the improving and replenishing of technique scheme, the present invention also comprises following additional technical feature, so as when to state technical scheme on the implementation technical characterictics that these are additional individually or any combination get up to be applied in the technique scheme:
The waveguiding structure parameter of described inner sandwich layer, outer sandwich layer, inner cladding, ring core covering is:
0.53％≤Δn1≤0.65％，3.0um≤R1≤4.0um，
0.15％≤Δn2≤0.40％，6.4um≤R2≤8.4um，
-0.1％≤Δn3≤0.03％，11.6um≤R3≤14.6um，
0.15％≤Δn4≤0.25％，17.6um≤R4≤19.8um，
Wherein Δ n1, Δ n2, Δ n3, Δ n4 are respectively inner sandwich layer, outer sandwich layer, inner cladding, ring core covering with the nc refractive index contrast of refractive index as a reference, and R1, R2, R3, R4 are respectively the diameter of inner sandwich layer, outer sandwich layer, inner cladding, ring core covering.Surrounding layer is pure silica glass layer, and its refractive index is the refractive index n c of pure silicon dioxide glass, its refractive index contrast Δ nc=0.From R1 to R2, the refractive index of outer sandwich layer by Δ n2 gradual change to Δ n3.
Described outer sandwich layer gradually changed refractive index distributes and satisfies formula:
N (r)=nc* [1-2 Δ (r/r2)
a]
1/2, r1≤r≤r2 wherein, r is the radius variable of outer sandwich layer, and r1 is the radius of inner sandwich layer, and r2 is the radius of outer sandwich layer, and α is a gradual change rule coefficient.
Outside described, mix at least a of germanium, fluorine, three kinds of elements of phosphorus in sandwich layer, inner cladding, the ring core covering respectively.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.
Through accurate adjustment to Refractive Index Profile o; The gradual change alpha of the refractive index of especially outer sandwich layer; Can obtain the mould field distribution (useful area) and the dispersion characteristics of needs; Be dispersion values, chromatic dispersion gradient, and have lower polarization mode dispersion, loss, excellent bending property and welding performance that therefore optical fiber of the present invention is special has following characteristic
1550nm chromatic dispersion gradient≤0.073ps/ (nm
2Km);
Zero-dispersion wavelength≤1500nm;
Useful area is 70～75um
2
Chromatic dispersion in 1530nm～1565nm scope is 2.5～6.5ps/ (nmkm);
Chromatic dispersion in 1565nm～1625nm scope is 6～12ps/ (nmkm);
Loss≤0.22dB/km of 1550 is at the loss≤0.22dB/km of 1530nm～1565nm wave band.
According to the fibre-optical bending performance measurement method; φ 60mm mandrel around 100 the circle test 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≤
Fiber core layer of the present invention can adopt but be not limited to technologies such as MCVD, PCVD or OVD and be made, to realize the fibre-optic waveguide structural design of regulation.
The invention has the beneficial effects as follows:
1, compares with non-zero dispersion displacement single mode waveguiding structure in the past; Structure of the present invention is simple relatively; Not only can obtain easily, and waveguiding structure has corresponding dispersion characteristics in the numerical value interval of regulation, combine the accurate control ability of technology refractive index such as MCVD, PCVD, 0VD distribution; Produce easily and quality control, can obtain the optical fiber property that is designed expeditiously.
2, optical fiber of the present invention has big mould field distribution, and chromatic dispersion gradient is lower, and the characteristic of optical fiber is enough to satisfy the requirement that suppresses nonlinear effect, reduces the system dispersion management costs, is applicable to the DWDM transmission needs of C+L wave band or S+C+L wave band.
3, 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, and the PMD performance of optical fiber is improved.Through to suitably the choosing of prefabricated rod cladding doping composition, reach the optimization internal stress distribution in the present invention, make the fiber PMD stable performance.
4, optical fiber of the present invention and other non-zero dispersion displacement optical fiber NZ-DSF welding have low splice loss, splice attenuation, and the welding performance is fabulous.
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.
Fig. 4 is the optical fiber and existing dispersion curve synoptic diagram with the type optical fiber commodity of the embodiment of the invention.
Embodiment
The improved non-zero dispersion displacement single mode optical fibre of the present invention with big mould field distribution; Comprise fiber core layer and be enclosed in the covering on the fiber core layer; Fiber core layer comprises inner sandwich layer with different refractivity and the outer sandwich layer that surrounds inner sandwich layer; The refractive index of said outer sandwich layer is a graded profile, and covering comprises inner cladding from inside to outside, ring core covering and the surrounding layer with different refractivity, and surrounding layer is the pure silicon dioxide glassy layer.Below through several specific embodiments it is elaborated.
Embodiment 1:
As shown in Figure 1 is a kind of fibre-optic waveguide refractive index distribution curve of the present invention, and following is one group of refractive index contrast distribution parameter:
The parameter of inner sandwich layer Core1 is: Δ n1 is about 0.60%, and R1 is about 3.6um,
The parameter of outer sandwich layer Core2 is: Δ n2 is about 0.25%, and R2 is about 7.6um,
The parameter of inner cladding Clad1 is: Δ n3 is about 0.02%, and R3 is about 12.8um,
The parameter of ring core covering Clad2 is: Δ n4 is about 0.21%, and R4 is about 17.2um,
The parameter of surrounding layer (being outermost layer) Clad3 is: Δ nc is about 0.00%, and R5 is 125um,
Surrounding layer Clad3 is the pure silicon dioxide glassy layer, and its refractive index is nc (Δ nc=0),
Outer sandwich layer Core2 gradually changed refractive index distributes and satisfies formula: n (r)=nc* [1-2 Δ (r/r2)
a]
1/2, r1≤r≤r2 wherein, r is the radius variable of outer sandwich layer, and r1 is the radius of inner sandwich layer, and r2 is the radius of outer sandwich layer, and gradual change rule alpha gets 1; The refractive index of outer sandwich layer Core2 is gradient to Δ n3 by Δ n2 from R1 to R2.
The characteristic of gained optical fiber is following:
1550nm useful area: 74um
2,
Zero-dispersion wavelength: 1487nm,
At 1550nm chromatic dispersion: 4.45ps/ (nmkm),
At the 1550nm chromatic dispersion gradient: 0.0714ps/ (nm
2Km),
At 1530nm chromatic dispersion: 3.03ps/ (nmkm),
At 1625nm chromatic dispersion: 9.866ps/ (nmkm),
Cable cut-off wavelength: 1330nm,
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: 0.04dB.
Macrobend φ 32mm is around 1 circle, at the maximal value of the added losses of 1550nm and 1625nm: 0.05dB.
The said optic fibre characteristic of this embodiment at the chromatic dispersion gradient of 1550nm less than 0.073ps/ (nm
2Km), useful area is 74um
2, and decay and bending property excellence, the splice loss, splice attenuation of different batches optical fiber self is less than 0.03dB, with the splice loss, splice attenuation of other NZ-DSF optical fiber less than 0.06dB.Optic fibre characteristic can be applicable to the dwdm system transmission needs of C+L wave band.
Embodiment 2:
According to fibre-optic waveguide refractive index distribution curve shown in Figure 2, following is one group of refractive index contrast distribution parameter:
The parameter of inner sandwich layer Core1 is: Δ n1 is about 0.58%, and R1 is about 3.8um,
The parameter of outer sandwich layer Core2 is: Δ n2 is about 0.24%, and R2 is about 7.8um,
The parameter of inner cladding Clad1 is: Δ n3 is about-0.05%, and R3 is about 13.0um,
The parameter of ring core covering Clad2 is: Δ n4 is about 0.23%, and R4 is about 18.2um,
The parameter of surrounding layer Clad3 is: Δ nc is about 0.00%, and R5 is about 125um,
Surrounding layer Clad3 is the pure silicon dioxide glassy layer, and its refractive index is nc,
Outer sandwich layer Core2 gradually changed refractive index distributes and satisfies formula: n (r)=nc* [1-2 Δ (r/r2)
a]
1/2, r1≤r≤r2 wherein, r is the radius variable of outer sandwich layer, and r1 is the radius of inner sandwich layer, and r2 is the radius of outer sandwich layer, and gradual change rule alpha gets 1; The refractive index of outer sandwich layer Core2 is gradient to Δ n3 by Δ n2 from R1 to R2.
The characteristic of gained optical fiber is following:
1550nm useful area: 72um
2,
Zero-dispersion wavelength: 1470nm,
At 1550nm chromatic dispersion: 5.29ps/ (nmkm),
At the 1550nm chromatic dispersion gradient: 0.068ps/ (nm
2Km),
At 1530nm chromatic dispersion: 3.94ps/ (nmkm),
At 1565nm chromatic dispersion: 6.29ps/ (nmkm),
At 1625nm chromatic dispersion: 10.48ps/ (nmkm),
Cable cut-off wavelength: 1330nm,
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: 0.035dB.
Macrobend φ 32mm is around 1 circle, at the maximal value of the added losses of 1550nm and 1625nm: 0.045dB.
The said optic fibre characteristic of this embodiment at the chromatic dispersion gradient of 1550nm less than 0.07ps/ (nm
2Km), useful area 72um
2, and decay and bending property excellence, the splice loss, splice attenuation of different batches optical fiber self is less than 0.03dB, with the splice loss, splice attenuation of other NZ-DSF optical fiber less than 0.06dB.Optic fibre characteristic can be applicable to the dwdm system transmission needs of C+L wave band.
Embodiment 3:
According to fibre-optic waveguide refractive index distribution curve shown in Figure 3, following is one group of refractive index contrast distribution parameter:
The parameter of inner sandwich layer Core1 is: Δ n1 is about 0.56%, and R1 is about 4.0um,
The parameter of outer sandwich layer Core2 is: Δ n2 is about 0.22%, and R2 is about 8.0um,
The parameter of inner cladding Clad1 is: Δ n3 is about-0.07%, and R3 is about 13.6um,
The parameter of the first ring core covering Clad2 is: Δ n4 is about 0.22%, and R4 is about 19.2um,
The parameter of the second ring core covering Clad3 is: Δ n5 is about 0.-08%, and R5 is about 20.8um,
Outermost layer is that the parameter of surrounding layer Clad4 is: Δ nc is about 0.00%, and R6 is 125um,
Covering layering Clad4 is the pure silicon dioxide glassy layer, and its refractive index is nc (Δ nc=0),
Described outer sandwich layer gradually changed refractive index distributes and satisfies formula: n (r)=nc* [1-2 Δ (r/r2)
a]
1/2, r1≤r≤r2 wherein, r is the radius variable of outer sandwich layer, and r1 is the radius of inner sandwich layer, and r2 is the radius of outer sandwich layer, and gradual change rule alpha gets 1; The refractive index of outer sandwich layer Core2 is gradient to Δ n3 by Δ n2 from R1 to R2.
The characteristic of gained optical fiber is following:
1550nm useful area: 73um
2,
Zero-dispersion wavelength: 1450nm,
At 1550nm chromatic dispersion: 6.6ps/ (nmkm),
At the 1550nm chromatic dispersion gradient: 0.068ps/ (nm
2Km),
At 1530nm chromatic dispersion: 5.3ps/ (nmkm),
At 1625nm chromatic dispersion: 11.5ps/ (nmkm),
Cable cut-off wavelength: 1320nm,
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: 0.04dB.
Macrobend φ 32mm is around 1 circle, at the maximal value of the added losses of 1550nm and 1625nm: 0.045dB.
These embodiment 3 said optic fibre characteristics at the chromatic dispersion gradient of 1550nm less than 0.07ps/ (nm
2Km), useful area 73um
2, and decay and bending property excellence, the splice loss, splice attenuation of different batches optical fiber self is less than 0.03dB, with the splice loss, splice attenuation of other NZ-DSF optical fiber less than 0.06dB.Optic fibre characteristic can be applicable to the dwdm system transmission needs of S+C+L wave band.
The definition of some terms among the present invention:
Refractive indices is defined by following equation:
Refractive index contrast Δ ni%=[(ni
2-nc
2)/2ni
2] (1)
Wherein ni is the optical fibre refractivity of i layer, and nc is the refractive index of surrounding layer pure silicon dioxide glass part, in this application its refractive index as a reference.
The definition of index distribution is meant the relation of on the selected part of optical fiber refractive index n i or Δ ni optical fiber relative with it center ri (radius).
Gradually changed refractive index distributes, and satisfies formula: n (r)=nc* [1-2 Δ (r/a)
a]
1/2, 0≤r≤a
Wherein: r is the radius variable; α is a gradual change rule coefficient, the shape of its decision change curve, can value (0, ∞); A is a constant, when the various refractive index of design, can confirm as different constants.
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 change changes; Fibre-optical dispersion numerical value also changes along with wavelength change, and chromatic dispersion gradient is represented this variability, and 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).
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, with the cost of transport property that reduces system or increase dispersion compensation.
Useful area Aeff=2 π (∫ E
2Rdr)
2/ (∫ E
4Rdr) (2)
Integration is limited to 0 to ∞ in the formula, and E is and propagates relevant electric field.
DWDM is the abbreviation of dense wavelength division multiplexing system.
PMD is the 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 etc.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 be with OTDR at the 1550nm place bidirectional measurement average.
Claims (8)
1. improved non-zero dispersion displacement single mode optical fibre with big mould field distribution, it comprises fiber core layer and is enclosed in the covering on the fiber core layer, it is characterized in that said fiber core layer comprises inner sandwich layer with different refractivity and the outer sandwich layer that surrounds said inner sandwich layer; The refractive index of said outer sandwich layer is a graded profile; Covering comprises inner cladding from inside to outside, ring core covering and the surrounding layer with different refractivity, and surrounding layer is the pure silicon dioxide glassy layer, and the index distribution of said fiber core layer is n1＞n2＞nc; Said cladding index is distributed as n4＞nc＞n3; Wherein: n1 is the refractive index of inner sandwich layer, and n2 is the largest refractive index of outer sandwich layer, and n3 is the refractive index of inner cladding; N4 is the refractive index of ring core covering, and nc is the refractive index of surrounding layer;
The waveguiding structure parameter of described inner sandwich layer, outer sandwich layer, inner cladding, ring core covering is:
0.53％≤Δn1≤0.65％，3.0um≤R1≤4.0um，
0.15％≤Δn2≤0.40％，6.4um≤R2≤8.4um，
-0.1％≤Δn3≤0.03％，11.6um≤R3≤14.6um，
0.15％≤Δn4≤0.25％，17.6um≤R4≤19.8um，
Wherein Δ n1, Δ n2, Δ n3, Δ n4 are respectively inner sandwich layer, outer sandwich layer, inner cladding, ring core covering with the nc refractive index contrast of refractive index as a reference; R1, R2, R3, R4 are respectively the diameter of inner sandwich layer, outer sandwich layer, inner cladding, ring core covering; From R1 to R2, the refractive index of outer sandwich layer by Δ n2 gradual change to Δ n3.
2. a kind of improved non-zero dispersion displacement single mode optical fibre according to claim 1 with big mould field distribution, it is characterized in that described outer sandwich layer gradually changed refractive index distributes satisfies formula:
N (r)=nc* [1-2 Δ (r/r2)
α]
1/2, r1≤r≤r2 wherein, r is the radius variable of outer sandwich layer, and r1 is the radius of inner sandwich layer, and r2 is the radius of outer sandwich layer, and α is a gradual change rule coefficient.
3. a kind of improved non-zero dispersion displacement single mode optical fibre with big mould field distribution according to claim 1 is characterized in that in described inner cladding, ring core covering, mixing respectively at least a of germanium, fluorine, three kinds of elements of phosphorus.
4. a kind of improved non-zero dispersion displacement single mode optical fibre with big mould field distribution according to claim 1 is characterized in that:
1550nm chromatic dispersion gradient≤0.073ps/ (nm
2Km);
Zero-dispersion wavelength≤1500nm;
Useful area is 70～75um
2
Chromatic dispersion in 1530nm～1565nm scope is 2.5～6.5ps/ (nmkm);
Chromatic dispersion in 1565nm～1625nm scope is 6～12ps/ (nmkm);
Loss≤0.22dB/km of 1550 is at the loss≤0.22dB/km of 1530nm～1565nm wave band.
5. improved non-zero dispersion displacement single mode optical fibre with big mould field distribution, it comprises fiber core layer and is enclosed in the covering on the fiber core layer, it is characterized in that said fiber core layer comprises inner sandwich layer with different refractivity and the outer sandwich layer that surrounds said inner sandwich layer; The refractive index of said outer sandwich layer is a graded profile; Covering comprises inner cladding from inside to outside, ring core covering and the surrounding layer with different refractivity, and surrounding layer is the pure silicon dioxide glassy layer, and the index distribution of said fiber core layer is n1＞n2＞nc; Said cladding index is distributed as n4＞n3＞nc; Wherein: n1 is the refractive index of inner sandwich layer, and n2 is the largest refractive index of outer sandwich layer, and n3 is the refractive index of inner cladding; N4 is the refractive index of ring core covering, and nc is the refractive index of surrounding layer;
The waveguiding structure parameter of described inner sandwich layer, outer sandwich layer, inner cladding, ring core covering is:
0.53％≤Δn1≤0.65％，3.0um≤R1≤4.0um，
0.15％≤Δn2≤0.40％，6.4um≤R2≤8.4um，
-0.1％≤Δn3≤0.03％，11.6um≤R3≤14.6um，
0.15％≤Δn4≤0.25％，17.6um≤R4≤19.8um，
Wherein Δ n1, Δ n2, Δ n3, Δ n4 are respectively inner sandwich layer, outer sandwich layer, inner cladding, ring core covering with the nc refractive index contrast of refractive index as a reference; R1, R2, R3, R4 are respectively the diameter of inner sandwich layer, outer sandwich layer, inner cladding, ring core covering; From R1 to R2, the refractive index of outer sandwich layer by Δ n2 gradual change to Δ n3.
6. a kind of improved non-zero dispersion displacement single mode optical fibre according to claim 5 with big mould field distribution, it is characterized in that described outer sandwich layer gradually changed refractive index distributes satisfies formula:
N (r)=nc* [1-2 Δ (r/r2)
α]
1/2, r1≤r≤r2 wherein, r is the radius variable of outer sandwich layer, and r1 is the radius of inner sandwich layer, and r2 is the radius of outer sandwich layer, and α is a gradual change rule coefficient.
7. a kind of improved non-zero dispersion displacement single mode optical fibre with big mould field distribution according to claim 5 is characterized in that in described inner cladding, ring core covering, mixing respectively at least a of germanium, fluorine, three kinds of elements of phosphorus.
8. a kind of improved non-zero dispersion displacement single mode optical fibre with big mould field distribution according to claim 5 is characterized in that:
1550nm chromatic dispersion gradient≤0.073ps/ (nm
2Km);
Zero-dispersion wavelength≤1500nm;
Useful area is 70～75um
2
Chromatic dispersion in 1530nm～1565nm scope is 2.5～6.5ps/ (nmkm);
Chromatic dispersion in 1565nm～1625nm scope is 6～12ps/ (nmkm);
Loss≤0.22dB/km of 1550 is at the loss≤0.22dB/km of 1530nm～1565nm wave band.
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| CN102998743A (en) * | 2013-01-05 | 2013-03-27 | 中天科技光纤有限公司 | Low-loss single-mode optical fiber applied to long-distance communication transmission and manufacture method thereof |
| CN102998743B (en) * | 2013-01-05 | 2015-04-01 | 中天科技光纤有限公司 | Low-loss single-mode optical fiber applied to long-distance communication transmission and manufacture method thereof |
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