CN103472525B - Low-loss large-effective area single mode fiber and manufacturing method thereof - Google Patents
Low-loss large-effective area single mode fiber and manufacturing method thereof Download PDFInfo
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- CN103472525B CN103472525B CN201310409008.9A CN201310409008A CN103472525B CN 103472525 B CN103472525 B CN 103472525B CN 201310409008 A CN201310409008 A CN 201310409008A CN 103472525 B CN103472525 B CN 103472525B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses a low-loss large-effective area single mode fiber and a manufacturing method of the low-loss large-effective area single mode fiber, and relates to the field of optical fibers. The low-loss large-effective area single mode fiber comprises a quartz glass cladding, an internal coating and an external coating, wherein the quartz glass cladding, the internal coating and the external coating are arranged in sequence from inside to outside; the inside of the quartz glass cladding comprises a first fiber core area, a second fiber core area, a third fiber core area, a fourth fiber core area and a refractive index concave cladding, wherein the first fiber core area, the second fiber core area, the third fiber core area, the fourth fiber core area and the refractive index concave cladding are arranged in sequence from inside to outside; the refractive index concave cladding is subjected to deposition through a PCVD process; the quartz glass cladding is manufactured through an OVD process or a sleeving process. According to the low-loss large-effective area single mode fiber and the manufacturing method of the low-loss large-effective area single mode fiber, the scattering loss of the low-loss large-effective area single mode fiber and the additional loss of the low-loss large-effective area single mode fiber in a bent state can be reduced; due to the fact that the spire distribution of fiber core basic mode electromagnetic field power is adjusted into flattop distribution, optical power density is reduced, the effective area of the low-loss large-effective area single mode fiber is enlarged, the nonlinearity of the low-loss large-effective area single mode fiber is reduced, the incident power of an optical fiber communication system is increased by 0.4-2.6 dB, and the low-loss large-effective area single mode fiber is suitable for mass production.
Description
Technical field
The present invention relates to field fiber, particularly relate to a kind of low-loss large-effective area single mode fiber and manufacture method thereof.
Background technology
The technical term that the present invention relates to is defined as follows:
Deposition: the technological process that chemical reaction generates the quartz glass of doping occurs optical fiber starting material under certain circumstances.
Molten contracting: the technological process of post-depositional hollow glass tube being burnt till under certain thermal source solid glass rod gradually.
Sleeve pipe: the purity quartz glass pipe for high meeting certain sectional area and dimensional homogeneity.
Base tube: for the purity quartz glass pipe for high deposited.
Refractive index profile (RIP): the relation curve between the refractive index of optical fiber or preform (comprising fibre-optical mandrel) and its radius.
Relative index of refraction (Δ %):
wherein n
ibe the refractive index of i-th layer of fiber optic materials, i is positive integer, n
0for the refractive index of pure quartz glass.
Useful area:
Wherein, E is and propagates relevant electric field cross stream component, and r is fiber radius.
Mode field diameter:
Wherein, E is and propagates relevant electric field cross stream component, and r is fiber radius.
Total dispersion: the algebraic sum of fibre-optic waveguide dispersion and material dispersion.
Chromatic dispersion gradient: the slope of the change of chromatic dispersion versus wavelength.
PCVD: PCVD.
MCVD: the chemical vapor deposition of improvement.
OVD: Outside Vapor deposits.
VAD: axial vapor deposition.
RIC: rod cover cylinder method.
China's " Eight Verticals and Eight Horizontals " main line network has been on active service nearly 20 years, needs to update; Meanwhile, along with the evolution of the communication technology, China in 2013 starts scale and disposes 100G two-forty Commercial fibers communication system.Along with the quick growth of backbone traffic, also likely there is bottleneck in the coming years that are applied in of 100G, the transmission system of the follow-up super 100G occurring 400G, 1T more high transfer rate.
The gordian technique of high-speed transfer: palarization multiplexing phase-modulation, based on DSP(DigitalSignal Processing, digital signal processing) digital coherent to receive and third generation super error correction coding etc. progressively solves, for the relevant PM-QPSK(Polarization-MultiplexedQuadrature Phase Shift Keying of employing, palarization multiplexing Quadrature Phase Shift Keying) the 100G communication system of technology, the wavelength dispersion coefficient amounting to optical fiber is less than 20ps/nm/km, amount to PMD(Polarization Mode Dispersion, polarization mode dispersion) coefficient is less than 0.66pskm
-1/2, wavelength dispersion and PMD are no longer important limiting factors.
The performance of super 100G communication system to optical fiber proposes comprehensive requirement, not only requires that the loss of optical fiber is little, and requires the non-linear little of optical fiber.In theory, loss can solve with amplifier, but amplifier can increase the noise of system, causes the unreliable of communication system, therefore, expects that the loss of optical fiber is as far as possible low with the use reducing amplifier; And it is non-linear by fiber optic materials and structures shape, current systems technology also cannot compensate, especially nonlinear effect is the maximum bottleneck and the crucial problem that limit super 100G system long range propagation, merely pursue the ultra-low loss of optical fiber and have ignored the non-linear of optical fiber, adverse influence will be brought to communication system.
The patent No. is that the United States Patent (USP) of US7876990 proposes a kind of low-loss single-mode optical fiber, this patent Refractive Index Profile of Optical parameter value (α) is between 2.5 ~ 3.0, the refractive index contrast of fibre core and covering is between 0.30% ~ 0.40%, this optical fiber is less than 0.331dB/km at the loss factor of 1310nm wavelength, the water peak loss factor of 1383nm is less than 0.328dB/km, the loss factor of 1550nm wavelength is less than 0.190dB/km, and this optical fiber is at the MFD(Mode Field Diameter of 1550nm wavelength, mode field diameter) be 10.7 μm, the useful area of 1550nm wavelength is 85.143 μm
2.The fibre loss coefficient of this patent is higher, and useful area is less, can not meet the transmission requirement of 100G and super 100G high-speed communication system.
The patent No. is that the United States Patent (USP) of US7524780 proposes a kind of low loss fiber and manufacture method thereof, this patent spreads the alkaline metal of 0.035% volumetric molar concentration in quartz glass, this patent optical fiber is less than 0.180dB/km at the loss factor of 1550nm wavelength, but does not have the key index such as mode field diameter and useful area.
The patent No. is the manufacture method that the United States Patent (USP) of US8315493 proposes a kind of low-loss single-mode optical fiber; it adopts VAD/MCVD technology; prepared by fibre core VAD technique; the refringence of the relative pure silica cladding of fibre core is lower than 0.2%; inner cladding adopts MCVD preparation; the refractive index of the relatively pure quartz glass of inner cladding is recessed in 0 ~-0.2% scope; the optical fiber of this patent manufacture is 0.31dB/km at the water peak loss factor of 1383nm; the loss factor of 1550nm wavelength is less than 0.175dB/km; but due to MCVD, to mix fluorine efficiency low, is not suitable for large-scale production.
Publication number is US20130188917, the patent No. is the manufacture method that the United States Patent (USP) of US7524780 proposes a kind of preform, it introduces the alkali metals modified agent of 0.2% ~ 0.5% volumetric molar concentration in core region, reduce the glass transition temperature Tg of quartz glass, the scattering loss reducing optical fiber reaches the object reducing fibre loss, the ultimate value 0.150dB/km of pure silica glass material loss can be broken through in theory, but this complex process, easy introducing transition metal impurity pollutes, and extremely easily the opaque chloride glass of formation causes the decay of optical fiber to increase, gordian technique does not solve, also large-scale production is not suitable for.
The patent No. is that the Chinese patent of ZL200410030019.7 proposes a kind of super large effective area fiber, and this optical fiber is greater than 80 μm at 1310nm wavelength useful area
2, 1550nm is greater than 95 μm
2, 131.2 μm can be reached
2but the loss factor of its 1310nm wavelength is 0.35dB/km, 1550nm loss factor is 0.190dB/km, the abbe number of 1550nm is 20.08ps/nm/km ~ 20.64ps/nm/km, although this light useful area is larger, but loss factor is comparatively large, and dispersion is also bigger than normal, can not meet the demand of high-speed communication system.
Application number be 201180031939.9 Chinese patent application propose a kind of have graded index without germanium fibre core large-effective area single mode fiber, this fiber core does not mix germanium, fiber core refractive index has parabolic distribution, the mode that covering adopts quartz to mix fluorine is carried out, mix the recessed degree of depth of fluorine-0.25% ~-0.5%, 1550nm loss factor is at 0.15dB/km ~ 0.16dB/km, and useful area can reach 110 μm
2above, but the dispersion of its 1550nm reaches more than 20ps/nm/km, and 22 meters of fiber optic testing LP11 mould cutoff wavelengths are at more than 1400nm, and this causes 1310nm ~ 1400nm communication band to use.
Application number be 201180007436.8 Chinese patent application propose a kind of large effective area fiber without germanium fibre core, this fiber core does not mix germanium, and segmentation has been carried out to fibre core, center part raises up, all the other fiber core refractive index distribution parameters are between 15 ~ 200, this optical fiber can obtain the loss factor of 0.175dB/km, 100 ~ 160 μm
2useful area, but its bending loss is comparatively large, protruding refractive index of the centre strengthens optical power density, increases the non-linear of communication system on the contrary, and owing to adopting pure silicon core and mixing fluorine covering, production efficiency is low, is also not suitable for large-scale production.
In sum, existing technical scheme cannot the simultaneously loss of resolution system and non-linear two key technical problems, are also not suitable for large-scale production.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of low-loss large-effective area single mode fiber and manufacture method thereof are provided, the added losses under the scattering loss of optical fiber and fibre-optical bending state can be reduced, fibre core basic mode electromagnetic field power is distributed by pinnacle and is adjusted to flat-top distribution, reduce optical power density, increase the useful area of optical fiber, reduce the non-linear of optical fiber, make optical fiber telecommunications system launched power improve 0.4 ~ 2.6dB, be applicable to large-scale production.
The invention provides a kind of low-loss large-effective area single mode fiber, comprise the quartz glass covering, internal coating and the external coating that are arranged in order from the inside to the outside, described quartz glass covering inside also comprises the first core region, the second core region, the 3rd core region, the 4th core region and the recessed covering of refractive index that are arranged in order from the inside to the outside, and the radius of the first core region is r
1, the radius of the second core region is r
2, the radius of the 3rd core region is r
3, the radius of the 4th core region is r
4, the recessed covering inward flange of refractive index is r to the distance at the first core region center
5, the recessed covering outward flange of refractive index is r to the distance at the first core region center
6, the recessed covering of refractive index adopts PCVD PCVD technique to deposit, and quartz glass covering adopts Outside Vapor deposition OVD technique or sleeve pipe manufacture technics, wherein:
The refractive index contrast Δ of the first core region and quartz glass covering
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μm≤r
1≤ 2.0 μm, c
1for constant, 0.07%≤c
1≤ 0.15%;
The refractive index contrast Δ of the second core region and quartz glass covering
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μm≤r
2≤ 3.9 μm, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010;
The refractive index contrast Δ of the 3rd core region and quartz glass covering
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μm≤r
3≤ 5.0 μm, c
3for constant, 0.18%≤c
3≤ 0.32%;
The refractive index contrast Δ of the 4th core region and quartz glass covering
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, 5.0
μm≤r
4≤ 6.5 μm, B, C, c
4be constant ,-0.0010≤B≤-0.00075,0.0071≤C≤0.0088 ,-0.0175≤c
4≤-0.0144;
The recessed covering inward flange of refractive index of this optical fiber is to the distance r at the first core region center
5with the radius r of the 4th core region
4pass be: 3.0 μm≤r
5-r
4≤ 6.2 μm, the thickness of the recessed covering of this refractive index meets 5.0 μm≤r
6-r
5≤ 11.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k, t are constant, k=5 × 10
-6,
-9.46 × 10
-3≤ t≤
-2.70 × 10
-3.
On the basis of technique scheme, described optical fiber is at the loss factor≤0.289dB/km of 1310nm wavelength, loss factor≤the 0.187dB/km of loss factor≤0.175dB/km, the 1625nm wavelength of loss factor≤0.276dB/km, the 1550nm wavelength of 1383nm wavelength.
On the basis of technique scheme, described optical fiber when bending diameter be 15mm × 1 enclose, the added losses≤0.036dB of added losses≤0.025dB, the 1625nm wavelength of 1550nm wavelength.
On the basis of technique scheme, basic mode optical power distribution in described optical fiber is flat-top distribution, this optical fiber is 12.0 ~ 15.25 microns in the mode field diameter of 1550nm wavelength, be 110 ~ 183 square microns at the useful area of 1550nm wavelength, the nonlinear factor of this optical fiber is 0.565 ~ 0.936w
-1km
-1, launched power improves 0.4 ~ 2.6dB.
On the basis of technique scheme, described optical fiber is 16.52 ~ 18.12ps/nm/km at the abbe number of 1550nm wavelength, 22 meters of cutoff wavelengths are 1259 ~ 1286nm, and zero-dispersion wavelength is 1316.2 ~ 1321.9nm, and the slope of zero-dispersion wavelength is 0.086 ~ 0.091ps/nm
2/ km.
The present invention also provides a kind of manufacture method of above-mentioned low-loss large-effective area single mode fiber, comprises the following steps:
By silicon tetrachloride, germanium tetrachloride, high purity oxygen gas, C
2f
6mixed gas pass into depositing lathe, described depositing lathe is PCVD or VAD or MCVD or OVD depositing lathe, the total flow of mixed gas is 5000 ~ 13500ml/min, the quartz glass sandwich layer mixing germanium is generated, deposition the first core region of sandwich layer and the refractive index contrast Δ of quartz glass covering under oxyhydrogen flame high temperature
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μm≤r
1≤ 2.0 μm, c
1for constant, 0.07%≤c
1≤ 0.15%, form the first core region; The refractive index contrast Δ of the second core region and quartz glass covering
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0
μm≤r
2≤ 3.9 μm, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010, form the second core region; The refractive index contrast Δ of the 3rd core region and quartz glass covering
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μm≤r
3≤ 5.0 μm, c
3for constant, 0.18%≤c
3≤ 0.32%, form the 3rd core region; The refractive index contrast Δ of the 4th core region and quartz glass covering
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μm≤r
4≤ 6.5 μm, B, C, c
4be constant ,-0.0010≤B≤-0.00075,0.0071≤C≤0.0088 ,-0.0175≤c
4≤-0.0144, form the 4th core region;
After sandwich layer has deposited, adopt PCVD process deposits refractive index recessed inner cladding, the recessed covering inward flange of refractive index of this optical fiber is to the distance r at the first core region center
5with the radius r of the 4th core region
4pass be: 3.0 μm≤r
5-r
4≤ 6.2 μm, the thickness of the recessed covering of this refractive index meets: 5.0 μm≤r
6-r
5≤ 11.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k, t are constant, k=5 × 10
-6,-9.46 × 10
-3≤ t≤-2.70 × 10
-3, form r
5with r
6between refractive index recessed area, formed plug;
Adopt OVD technique to spray deposition quartz glass covering outward, the preform diameter dimension that outer spray is formed afterwards is 150 ~ 200mm; Or it is in the quartz glass sleeve of 150 ~ 200mm that the plug that PCVD technique is formed directly is loaded diameter, form preform;
This preform is placed on wire-drawer-tower, under the high temperature of 2000 DEG C ~ about 2300 DEG C, its wire drawing is become the optical fiber that external diameter is 125 microns, internal coating diameter is 190 ~ 192.3 microns, outer coating diameter is 243.4 ~ 246.5 microns.
On the basis of technique scheme, described optical fiber is at the loss factor≤0.289dB/km of 1310nm wavelength, loss factor≤the 0.187dB/km of loss factor≤0.175dB/km, the 1625nm wavelength of loss factor≤0.276dB/km, the 1550nm wavelength of 1383nm wavelength.
On the basis of technique scheme, described optical fiber when bending diameter be 15mm × 1 enclose, the added losses≤0.036dB of added losses≤0.025dB, the 1625nm wavelength of 1550nm wavelength.
On the basis of technique scheme, basic mode optical power distribution in described optical fiber is flat-top distribution, this optical fiber is 12.0 ~ 15.25 microns in the mode field diameter of 1550nm wavelength, be 110 ~ 183 square microns at the useful area of 1550nm wavelength, the nonlinear factor of this optical fiber is 0.565 ~ 0.936w
-1km
-1, launched power improves 0.4 ~ 2.6dB.
On the basis of technique scheme, described optical fiber is 16.52 ~ 18.12ps/nm/km at the abbe number of 1550nm wavelength, 22 meters of cutoff wavelengths are 1259 ~ 1286nm, and zero-dispersion wavelength is 1316.2 ~ 1321.9nm, and the slope of zero-dispersion wavelength is 0.086 ~ 0.091ps/nm
2/ km.
Compared with prior art, advantage of the present invention is as follows:
(1) fibre core basic mode electromagnetic field power is distributed by pinnacle and is adjusted to flat-top distribution by the present invention, optical fiber is 12.0 ~ 15.25 microns in the mode field diameter of 1550nm wavelength, can not only optical power density be reduced, and the useful area of optical fiber can be increased: this optical fiber is 110 ~ 183 square microns at the useful area of 1550nm wavelength.
(2) the present invention can reduce the non-linear of optical fiber: the nonlinear factor of this optical fiber is 0.565 ~ 0.936w
-1km
-1.
(3) fibre core that special in the present invention segmented core structural design effectively reduces optical fiber mixes germanium amount, the scattering loss of optical fiber can be reduced, this optical fiber is at the loss factor≤0.289dB/km of 1310nm wavelength, loss factor≤the 0.276dB/km of 1383nm wavelength, loss factor≤the 0.187dB/km of loss factor≤0.175dB/km, the 1625nm wavelength of 1550nm wavelength.
(4) the present invention can reduce the added losses under fibre-optical bending state, there is superior bending resistance, this optical fiber when bending diameter be 15mm × 1 enclose, the added losses≤0.036dB of added losses≤0.025dB, the 1625nm wavelength of 1550nm wavelength.
(5) this optical fiber is 16.52 ~ 18.12ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters of cutoff wavelengths are 1259 ~ 1286nm, and zero-dispersion wavelength is 1316.2 ~ 1321.9nm, and the slope of zero-dispersion wavelength is 0.086 ~ 0.091ps/nm
2/ km.
(6) the present invention makes the launched power of optical fiber telecommunications system improve 0.4 ~ 2.6dB, the reliability of communication can not only be improved, and effectively can extend the communication distance of communication system, the application demand of super 100G and 400G high-capacity and high-speed optical communication system can be met, there are good application prospect and economic and social benefits.
(7) the present invention can also enhance productivity, and reduces manufacturing cost, easy to operate, is applicable to large-scale production.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of low-loss large-effective area single mode fiber in the embodiment of the present invention.
Fig. 2 is the refractive index schematic diagram of low-loss large-effective area single mode fiber fibre core in the embodiment of the present invention.
Fig. 3 is the optical power distribution schematic diagram of basic mode in low-loss large-effective area single mode fiber fibre core in the embodiment of the present invention.
Fig. 4 is the optical power distribution schematic diagram of basic mode in general single mode fiber fibre core.
Fig. 5 is the loss spectra curve map of low-loss large-effective area single mode fiber in the embodiment of the present invention.
Fig. 6 is the mode field diameter of low-loss large-effective area single mode fiber and the curve map of useful area in the embodiment of the present invention, and wherein g1 is mode field diameter curve, and g2 is useful area curve.
Reference numeral: a
1-the first core region, a
2-the second core region, a
3-the three core region, a
4-the four core region, b-quartz glass covering, b
1the recessed covering inward flange of refractive index in-quartz glass covering, b
2the recessed covering outward flange of refractive index in-quartz glass covering, f
1-internal coating, f
2-external coating, r
1the radius of the-the first core region, r
2the radius of the-the second core region, r
3the radius of the-the three core region, r
4the radius of the-the four core region, r
5the distance at the recessed covering starting position of-refractive index and the first core region center, r
6the distance at the recessed covering end position of-refractive index and the first core region center.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of low-loss large-effective area single mode fiber, comprises the first core region a be arranged in order from the inside to the outside
1, the second core region a
2, the 3rd core region a
3, the 4th core region a
4, the recessed covering of refractive index, quartz glass covering b, internal coating f
1with external coating f
2, the first core region a
1radius be r
1, the second core region a
2radius be r
2, the 3rd core region a
3radius be r
3, the 4th core region a
4radius be r
4, refractive index recessed covering inward flange b
1to the first core region a
1the distance at center is r
5, refractive index recessed covering outward flange b
2to the first core region a
1the distance at center is r
6, the recessed covering of refractive index adopts PCVD (PCVD) technique to deposit, and quartz glass covering b adopts Outside Vapor deposition (OVD) technique or sleeve pipe manufacture technics, wherein:
First core region a
1with the refractive index contrast Δ of quartz glass covering b
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μm≤r
1≤ 2.0 μm, c
1for constant, 0.07%≤c
1≤ 0.15%;
Second core region a
2with the refractive index contrast Δ of quartz glass covering b
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μm≤r
2≤ 3.9 μm, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010;
3rd core region a
3with the refractive index contrast Δ of quartz glass covering b
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μm≤r
3≤ 5.0 μm, c
3for constant, 0.18%≤c
3≤ 0.32%;
4th core region a
4with the refractive index contrast Δ of quartz glass covering b
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μm≤r
4≤ 6.5 μm, B, C, c
4be constant ,-0.0010≤B≤-0.00075,0.0071≤C≤0.0088 ,-0.0175≤c
4≤-0.0144;
The refractive index recessed covering inward flange b of this optical fiber
1to the first core region a
1the distance r at center
5with the 4th core region a
4radius r
4pass be: 3.0 μm≤r
5-r
4≤ 6.2 μm, the thickness of the recessed covering of this refractive index meets 5.0 μm≤r
6-r
5≤ 11.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k, t are constant, k=5 × 10
-6,
-9.46 × 10
-3≤ t≤
-2.70 × 10
-3.
Basic mode optical power distribution in this optical fiber is flat-top distribution, and this optical fiber is 12.0 ~ 15.25 microns in the mode field diameter of 1550nm wavelength, is 110 ~ 183 square microns at the useful area of 1550nm wavelength, and the nonlinear factor of this optical fiber is 0.565 ~ 0.936w
-1km
-1, launched power improves 0.4 ~ 2.6dB.
This optical fiber is at the loss factor≤0.187dB/km of loss factor≤0.175dB/km, the 1625nm wavelength of loss factor≤0.276dB/km, the 1550nm wavelength of loss factor≤0.289dB/km, the 1383nm wavelength of 1310nm wavelength.
This optical fiber when bending diameter be 15mm × 1 enclose, the added losses≤0.036dB of added losses≤0.025dB, the 1625nm wavelength of 1550nm wavelength.
This optical fiber is 16.52 ~ 18.12ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters of cutoff wavelengths are 1259 ~ 1286nm, and zero-dispersion wavelength is 1316.2 ~ 1321.9nm, and the slope of zero-dispersion wavelength is 0.086 ~ 0.091ps/nm
2/ km.
This optical fiber makes optical fiber telecommunications system launched power improve more than 0.40dB; launched power optimal value promotes more than 2.0dB; transmission range and the transfer rate of communication system can not only be expanded; and the reliability of communication system can be promoted; be easy to large-scale production, be applicable to very much the application of 100Gbit/s and super 100Gbit/s high-capacity and high-speed communication system.
The embodiment of the present invention also provides the manufacture method of above-mentioned low-loss large-effective area single mode fiber, comprises the following steps:
By silicon tetrachloride, germanium tetrachloride, high purity oxygen gas, C
2f
6mixed gas pass into depositing lathe (PCVD or VAD or MCVD or OVD), the total flow of mixed gas is 5000 ~ 13500ml/min, generates and mix the quartz glass sandwich layer of germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1with the refractive index contrast Δ of quartz glass covering b
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μm≤r
1≤ 2.0 μm, c
1for constant, 0.07%≤c
1≤ 0.15%, this part corresponds to the r in Fig. 2
1refractive index curve, forms the first core region a in Fig. 1
1; Second core region a
2with the refractive index contrast Δ of quartz glass covering b
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μm≤r
2≤ 3.9 μm, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010, this part corresponds to the r in Fig. 2
2refractive index curve, forms the second core region a in Fig. 1
2; 3rd core region a
3with the refractive index contrast Δ of quartz glass covering b
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μm≤r
3≤ 5.0 μm, c
3for constant, 0.18%≤c
3≤ 0.32%, this part corresponds to the r in Fig. 2
3refractive index curve, forms the 3rd core region a in Fig. 1
3; 4th core region a
4with the refractive index contrast Δ of quartz glass covering b
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μm≤r
4≤ 6.5 μm, B, C, c
4be constant ,-0.0010≤B≤-0.00075,0.0071≤C≤0.0088 ,-0.0175≤c
4≤-0.0144, this part corresponds to the r in Fig. 2
4refractive index curve, forms the 4th core region a in Fig. 1
4.
After sandwich layer has deposited, adopt the recessed inner cladding of PCVD process deposits refractive index, the refractive index recessed covering inward flange b of this optical fiber
1to the first core region a
1the distance r at center
5with the 4th core region a
4radius r
4pass be: 3.0 μm≤r
5-r
4≤ 6.2 μm, the thickness of the recessed covering of this refractive index meets: 5.0 μm≤r
6-r
5≤ 11.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k, t are constant, k=5 × 10
-6,-9.46 × 10
-3≤ t≤-2.70 × 10
-3, the r in pie graph 2
5with r
6between refractive index recessed area, the refractive index recessed covering inward flange b in corresponding diagram 1 in quartz glass covering b
1with the refractive index recessed covering outward flange b in quartz glass covering b
2between refractive index area, formed plug.
Adopt OVD technique to spray deposition quartz glass covering b outward, form the cladding regions of quartz glass covering b part in Fig. 1, the preform diameter dimension that outer spray is formed afterwards is 150 ~ 200mm; Or it is in the quartz glass sleeve of 150 ~ 200mm that the plug that PCVD technique is formed directly is loaded diameter, form preform.
This preform is placed on wire-drawer-tower, under the high temperature of 2000 DEG C ~ about 2300 DEG C, its wire drawing is become external diameter to be 125 microns, internal coating f
1diameter is 190 ~ 192.3 microns, external coating f
2diameter is the optical fiber of 243.4 ~ 246.5 microns.
Through test, basic mode optical power distribution in this optical fiber is flat-top distribution, this optical fiber is 12.0 ~ 15.25 microns in the mode field diameter of 1550nm wavelength, is 110 ~ 183 square microns at the useful area of 1550nm wavelength, and the nonlinear factor of this optical fiber is 0.565 ~ 0.936w
-1km
-1, launched power improves 0.4 ~ 2.6dB.
This optical fiber is at the loss factor≤0.187dB/km of loss factor≤0.175dB/km, the 1625nm wavelength of loss factor≤0.276dB/km, the 1550nm wavelength of loss factor≤0.289dB/km, the 1383nm wavelength of 1310nm wavelength.
This optical fiber when bending diameter be 15mm × 1 enclose, the added losses≤0.036dB of added losses≤0.025dB, the 1625nm wavelength of 1550nm wavelength.
This optical fiber is 16.52 ~ 18.12ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters of cutoff wavelengths are 1259 ~ 1286nm, and zero-dispersion wavelength is 1316.2 ~ 1321.9nm, and the slope of zero-dispersion wavelength is 0.086 ~ 0.091ps/nm
2/ km.
Be described in detail below by 3 specific embodiments.
Embodiment 1
By silicon tetrachloride, germanium tetrachloride, high purity oxygen gas, C
2f
6mixed gas pass into depositing lathe (PCVD or VAD or MCVD or OVD), the total flow of mixed gas is 13500ml/min, generates and mix the quartz glass sandwich layer of germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1with the refractive index contrast Δ of quartz glass covering b
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, r
1=1.50 μm, c
1=0.10%, this part corresponds to the r in Fig. 2
1refractive index curve, forms the first core region a in Fig. 1
1; Second core region a
2with the refractive index contrast Δ of quartz glass covering b
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, r
2=3.0 μm, A=0.0022, c
2=-0.00006, this part corresponds to the r in Fig. 2
2refractive index curve, forms the second core region a in Fig. 1
2; 3rd core region a
3with the refractive index contrast Δ of quartz glass covering b
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, r
3=4.6 μm, c
3=0.22%, this part corresponds to the r in Fig. 2
3refractive index curve, forms the 3rd core region a in Fig. 1
3; 4th core region a
4with the refractive index contrast Δ of quartz glass covering b
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, r
4=6.0 μm, B=-0.00089, C=0.0080, c
4=-0.0160, this part corresponds to the r in Fig. 2
4refractive index curve, forms the 4th core region a in Fig. 1
4.
After sandwich layer has deposited, adopt the recessed inner cladding of PCVD process deposits refractive index, the recessed covering starting position of refractive index of this optical fiber and the first core region a
1the distance r at center
5with the 4th core region a
4radius r
4pass be: r
5-r
4=3.0 μm, the thickness of the recessed covering of this refractive index meets: r
6-r
5=9.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k=5 × 10
-6, t=-4.86 × 10
-3, the r in pie graph 2
5with r
6between refractive index recessed area, the refractive index recessed covering inward flange b in corresponding diagram 1 in quartz glass covering b
1with the refractive index recessed covering outward flange b in quartz glass covering b
2between refractive index area, formed plug.Then, adopt OVD technique to spray deposition quartz glass covering b outward, form the cladding regions of quartz glass covering b part in Fig. 1, the preform diameter dimension that outer spray is formed afterwards is 150mm.
This preform is placed on wire-drawer-tower, under the high temperature of about 2000 DEG C, its wire drawing is become external diameter to be 125 microns, internal coating f
1diameter is 190 microns, external coating f
2diameter is the optical fiber of 245 microns.
This optical fiber is through test, and the basic mode optical power distribution in optical fiber is shown in Figure 3, and as can be seen from Figure 3 this basic mode luminous power center is flat-top.And the basic mode optical power distribution that Standard single-mode fiber tests out is shown in Figure 4, this optical fiber basic mode luminous power center is pinnacle distribution.
After tested, in the embodiment of the present invention, the nonlinear fiber coefficient of Fig. 3 shown type is 0.698w
-1km
-1, and the nonlinear factor of the general single mode fiber of Fig. 4 shown type is 1.317w
-1km
-1, the visible embodiment of the present invention significantly reduces the nonlinear factor of optical fiber, and launched power promotes 2.1dB.
Mode field diameter and the useful area curve of this optical fiber are shown in Figure 5, and as can be seen from Figure 5 the low-loss large effective area fiber of this inventive embodiments is 14.56 μm in the mode field diameter of 1550nm wavelength, and useful area is 166.5 μm
2; And routine G.652 single-mode fiber be 10.40 ± 0.5 μm in the mode field diameter of 1550nm wavelength, useful area is 80 μm
2.
The loss spectra test curve of this optical fiber is shown in Figure 6, as can be seen from Figure 6, this optical fiber is 0.285dB/km at the loss factor of 1310nm wavelength, the loss factor of 1383nm wavelength is 0.269dB/km, the loss factor of 1550nm wavelength is the loss factor of 0.173dB/km, 1625nm is 0.186dB/km.
The leading indicator ginseng of this optical fiber is shown in Table 1: this optical fiber is 17.36ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters of cutoff wavelengths are 1260nm, and zero-dispersion wavelength is 1320.8nm, and the slope of zero-dispersion wavelength is 0.086ps/nm
2/ km.This optical fiber when bending diameter be 15mm × 1 enclose, the added losses of 1550nm wavelength are the added losses of 0.016dB, 1625nm wavelength is 0.023dB.
The key technical indexes of the optical fiber that table 1, embodiment 1 manufacture
| Technical parameter | Numerical value | Unit |
| Decay@1310nm | 0.285 | dB/km |
| Decay@1383nm | 0.269 | dB/km |
| Decay@1550nm | 0.173 | dB/km |
| Decay@1625nm | 0.186 | dB/km |
| MFD1550 | 14.56 | μm |
| 1550nm useful area | 166.5 | 2μm |
| 22 meters of cutoff wavelengths | 1260 | nm |
| Zero-dispersion wavelength | 1320.8 | nm |
| Zero-dispersion slop | 0.086 | ps/nm 2/km |
| 1550nm dispersion | 17.36 | ps/nm/km |
| Macrobending loss φ 15*1@1550nm | 0.016 | dB |
| Macrobending loss φ 15*1@1625nm | 0.023 | dB |
Embodiment 2
By silicon tetrachloride, germanium tetrachloride, high purity oxygen gas, C
2f
6mixed gas pass into depositing lathe (PCVD or VAD or MCVD or OVD), the total flow of mixed gas is 12600ml/min, generates and mix the quartz glass sandwich layer of germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1with the refractive index contrast Δ of quartz glass covering b
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, r
1=1.0 μm, c
1=0.07%, this part corresponds to the r in Fig. 2
1refractive index curve, forms the first core region a in Fig. 1
1; Second core region a
2with the refractive index contrast Δ of quartz glass covering b
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, r
2=3.9 μm, A=0.0019, c
2=-0.00001, this part corresponds to the r in Fig. 2
2refractive index curve, forms the second core region a in Fig. 1
2; 3rd core region a
3with the refractive index contrast Δ of quartz glass covering b
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, r
3=2.5 μm, c
3=0.18%, this part corresponds to the r in Fig. 2
3refractive index curve, forms the 3rd core region a in Fig. 1
3; 4th core region a
4with the refractive index contrast Δ of quartz glass covering b
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, r
4=5.0 μm, B=-0.00075, C=0.0088, c
4=-0.0144, this part corresponds to the r in Fig. 2
4refractive index curve, forms the 4th core region a in Fig. 1
4.
After sandwich layer has deposited, adopt the recessed inner cladding of PCVD process deposits refractive index, the recessed covering starting position of refractive index of this optical fiber and the first core region a
1the distance r at center
5with the 4th core region a
4radius r
4pass be: r
5-r
4=6.2 μm, the thickness of the recessed covering of this refractive index meets: r
6-r
5=5.0 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k=5 × 10
-6, t=-9.46 × 10
-3, the r in pie graph 2
5with r
6between refractive index recessed area, the refractive index recessed covering inward flange b in corresponding diagram 1 in quartz glass covering b
1with the refractive index recessed covering outward flange b in quartz glass covering b
2between refractive index area, form plug, directly to load diameter be in the quartz glass sleeve of 165mm to plug PCVD technique formed, and forms preform.
This preform is placed on wire-drawer-tower, under the high temperature of about 2200 DEG C, its wire drawing is become external diameter to be 125 microns, internal coating f
1diameter is 192.2 microns, external coating f
2diameter is the optical fiber of 246.5 microns.
Through test, the basic mode optical power distribution in this optical fiber is flat-top distribution, and this optical fiber is 12.1 μm in the mode field diameter of 1550nm wavelength, and useful area is 110.6 μm
2; The nonlinear factor of this optical fiber is 0.936w
-1km
-1, launched power promotes 0.40dB; This optical fiber is 0.183dB/km at the loss factor that the loss factor that the loss factor that the loss factor of 1310nm wavelength is 0.282dB/km, 1383nm wavelength is 0.271dB/km, 1550nm wavelength is 0.170dB/km, 1625nm wavelength.
The leading indicator ginseng of this optical fiber is shown in Table 2: this optical fiber is 18.12ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters of cutoff wavelengths are 1286nm, and zero-dispersion wavelength is 1321.9nm, and the slope of zero-dispersion wavelength is 0.091ps/nm
2/ km.This optical fiber when bending diameter be 15mm × 1 enclose, the added losses of 1550nm wavelength are the added losses of 0.022dB, 1625nm wavelength is 0.033dB.
The key technical indexes of the optical fiber that table 2, embodiment 2 manufacture
| Technical parameter | Numerical value | Unit |
| Decay@1310nm | 0.282 | dB/km |
| Decay@1383nm | 0.271 | dB/km |
| Decay@1550nm | 0.170 | dB/km |
| Decay@1625nm | 0.183 | dB/km |
| MFD1550 | 12.1 | μm |
| 1550nm useful area | 110.6 | μm 2 |
| 22 meters of cutoff wavelengths | 1286 | nm |
| Zero-dispersion wavelength | 1321.9 | nm |
| Zero-dispersion slop | 0.091 | ps/nm 2/km |
| 1550nm dispersion | 18.12 | ps/nm/km |
| Macrobending loss φ 15*1@1550nm | 0.022 | dB |
| Macrobending loss φ 15*1@1625nm | 0.033 | dB |
Embodiment 3
By silicon tetrachloride, germanium tetrachloride, high purity oxygen gas, C
2f
6mixed gas pass into depositing lathe (PCVD or VAD or MCVD or OVD), the total flow of mixed gas is 5000ml/min, generates and mix the quartz glass sandwich layer of germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1with the refractive index contrast Δ of quartz glass covering b
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, r
1=2.0 μm, c
1=0.15%, this part corresponds to the r in Fig. 2
1refractive index curve, forms the first core region a in Fig. 1
1; Second core region a
2with the refractive index contrast Δ of quartz glass covering b
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, r
2=3.0 μm, A=0.0025, c
2=-0.00010, this part corresponds to the r in Fig. 2
2refractive index curve, forms the second core region a in Fig. 1
2; 3rd core region a
3with the refractive index contrast Δ of quartz glass covering b
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, r
3=5.0 μm, c
3=0.32%, this part corresponds to the r in Fig. 2
3refractive index curve, forms the 3rd core region a in Fig. 1
3; 4th core region a
4with the refractive index contrast Δ of quartz glass covering b
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, r
4=6.5 μm, B=-0.0010, C=0.0071, c
4=-0.0175, this part corresponds to the r in Fig. 2
4refractive index curve, forms the 4th core region a in Fig. 1
4.
After sandwich layer has deposited, adopt the recessed inner cladding of PCVD process deposits refractive index, the recessed covering starting position of refractive index of this optical fiber and the first core region a
1the distance r at center
5with the 4th core region a
4radius r
4pass be: r
5-r
4=4.6 μm, the thickness of the recessed covering of this refractive index meets: r
6-r
5=11.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k=5 × 10
-6, t=-2.7 × 10
-3, the r in pie graph 2
5with r
6between refractive index recessed area, the refractive index recessed covering inward flange b in corresponding diagram 1 in quartz glass covering b
1with the refractive index recessed covering outward flange b in quartz glass covering b
2between refractive index area, formed plug.Then, adopt OVD technique to spray deposition quartz glass covering b outward, form the cladding regions of quartz glass covering b part in Fig. 1, the preform diameter dimension that outer spray is formed afterwards is 200mm.
This preform is placed on wire-drawer-tower, under the high temperature of about 2300 DEG C, its wire drawing is become external diameter to be 125 microns, internal coating f
1diameter is 192.3 microns, external coating f
2diameter is the optical fiber of 243.4 microns.
Through test, the basic mode optical power distribution in this optical fiber is flat-top distribution, and be 15.25 μm in the mode field diameter of 1550nm wavelength, useful area is 183 μm
2, nonlinear factor is 0.565w
-1km
-1, launched power promotes 2.6dB.This optical fiber is 0.187dB/km at the loss factor that the loss factor that the loss factor that the loss factor of 1310nm wavelength is 0.289dB/km, 1383nm wavelength is 0.276dB/km, 1550nm wavelength is 0.175dB/km, 1625nm wavelength.
The leading indicator ginseng of this optical fiber is shown in Table 3: this optical fiber is 16.52ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters of cutoff wavelengths are 1259.2nm, and zero-dispersion wavelength is 1316.2nm, and the slope of zero-dispersion wavelength is 0.087ps/nm
2/ km.This optical fiber when bending diameter be 15mm × 1 enclose, the added losses of 1550nm wavelength are the added losses of 0.025dB, 1625nm wavelength is 0.036dB.
The key technical indexes of the optical fiber that table 3, embodiment 3 manufacture
| Technical parameter | Numerical value | Unit |
| Decay@1310nm | 0.289 | dB/km |
| Decay@1383nm | 0.276 | dB/km |
| Decay@1550nm | 0.173 | dB/km |
| Decay@1625nm | 0.187 | dB/km |
| MFD1550 | 15.25 | μm |
| 1550nm useful area | 183.0 | μm 2 |
| 22 meters of cutoff wavelengths | 1259.2 | nm |
| Zero-dispersion wavelength | 1316.2 | nm |
| Zero-dispersion slop | 0.087 | ps/nm 2/km |
| 1550nm dispersion | 16.52 | ps/nm/km |
| Macrobending loss φ 15*1@1550nm | 0.025 | dB |
| Macrobending loss φ 15*1@1625nm | 0.036 | dB |
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these amendments and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then these revise and modification also within protection scope of the present invention.
The prior art that the content do not described in detail in instructions is known to the skilled person.
Claims (10)
1. a low-loss large-effective area single mode fiber, comprises quartz glass covering (b), the internal coating (f that are arranged in order from the inside to the outside
1) and external coating (f
2), it is characterized in that: described quartz glass covering (b) inside also comprises the first core region (a be arranged in order from the inside to the outside
1), the second core region (a
2), the 3rd core region (a
3), the 4th core region (a
4) and the recessed covering of refractive index, the first core region (a
1) radius be r
1, the second core region (a
2) radius be r
2, the 3rd core region (a
3) radius be r
3, the 4th core region (a
4) radius be r
4, the recessed covering inward flange of refractive index (b
1) to the first core region (a
1) distance at center is r
5, the recessed covering outward flange of refractive index (b
2) to the first core region (a
1) distance at center is r
6, the recessed covering of refractive index adopts PCVD PCVD technique to deposit, and quartz glass covering (b) adopts Outside Vapor to deposit OVD technique or sleeve pipe manufacture technics, wherein:
First core region (a
1) with the refractive index contrast Δ of quartz glass covering (b)
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μm≤r
1≤ 2.0 μm, c
1for constant, 0.07%≤c
1≤ 0.15%;
Second core region (a
2) with the refractive index contrast Δ of quartz glass covering (b)
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μm≤r
2≤ 3.9 μm, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010;
3rd core region (a
3) with the refractive index contrast Δ of quartz glass covering (b)
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μm≤r
3≤ 5.0 μm, c
3for constant, 0.18%≤c
3≤ 0.32%;
4th core region (a
4) with the refractive index contrast Δ of quartz glass covering (b)
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μm≤r
4≤ 6.5 μm, B, C, c
4be constant ,-0.0010≤B≤-0.00075,0.0071≤C≤0.0088 ,-0.0175≤c
4≤-0.0144;
The recessed covering inward flange of the refractive index (b of this optical fiber
1) to the first core region (a
1) the distance r at center
5with the 4th core region (a
4) radius r
4pass be: 3.0 μm≤r
5-r
4≤ 6.2 μm, the thickness of the recessed covering of this refractive index meets 5.0 μm≤r
6-r
5≤ 11.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k, t are constant, k=5 × 10
-6,-9.46 × 10
-3≤ t≤-2.70 × 10
-3.
2. low-loss large-effective area single mode fiber as claimed in claim 1, it is characterized in that: described optical fiber is at the loss factor≤0.289dB/km of 1310nm wavelength, loss factor≤the 0.276dB/km of 1383nm wavelength, loss factor≤the 0.187dB/km of loss factor≤0.175dB/km, the 1625nm wavelength of 1550nm wavelength.
3. low-loss large-effective area single mode fiber as claimed in claim 1, is characterized in that: described optical fiber when bending diameter be 15mm × 1 enclose, the added losses≤0.036dB of added losses≤0.025dB, the 1625nm wavelength of 1550nm wavelength.
4. low-loss large-effective area single mode fiber as claimed in claim 1, it is characterized in that: the basic mode optical power distribution in described optical fiber is flat-top distribution, this optical fiber is 12.0 ~ 15.25 microns in the mode field diameter of 1550nm wavelength, be 110 ~ 183 square microns at the useful area of 1550nm wavelength, the nonlinear factor of this optical fiber is 0.565 ~ 0.936w
-1km
-1, launched power improves 0.4 ~ 2.6dB.
5. the low-loss large-effective area single mode fiber according to any one of Claims 1-4, it is characterized in that: described optical fiber is 16.52 ~ 18.12ps/nm/km at the abbe number of 1550nm wavelength, 22 meters of cutoff wavelengths are 1259 ~ 1286nm, zero-dispersion wavelength is 1316.2 ~ 1321.9nm, and the slope of zero-dispersion wavelength is 0.086 ~ 0.091ps/nm
2/ km.
6. the manufacture method of low-loss large-effective area single mode fiber according to any one of claim 1 to 5, is characterized in that, comprise the following steps:
By silicon tetrachloride, germanium tetrachloride, high purity oxygen gas, C
2f
6mixed gas pass into depositing lathe, described depositing lathe is PCVD or VAD or MCVD or OVD depositing lathe, the total flow of mixed gas is 5000 ~ 13500ml/min, generates the quartz glass sandwich layer mixing germanium under oxyhydrogen flame high temperature, the first core region (a of deposition sandwich layer
1) with the refractive index contrast Δ of quartz glass covering (b)
1r () meets " Δ with the change of fiber core radius r
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μm≤r
1≤ 2.0 μm, c
1for constant, 0.07%≤c
1≤ 0.15%, form the first core region (a
1); Second core region (a
2) with the refractive index contrast Δ of quartz glass covering (b)
2r () meets " Δ with the change of fiber core radius r
2(r)=A × ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μm≤r
2≤ 3.9 μm, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010, form the second core region (a
2); 3rd core region (a
3) with the refractive index contrast Δ of quartz glass covering (b)
3r () meets " Δ with the change of fiber core radius r
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μm≤r
3≤ 5.0 μm, c
3for constant, 0.18%≤c
3≤ 0.32%, form the 3rd core region (a
3); 4th core region (a
4) with the refractive index contrast Δ of quartz glass covering (b)
4r () meets " Δ with the change of fiber core radius r
4(r)=B × r
2+ C × r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μm≤r
4≤ 6.5 μm, B, C, c
4be constant ,-0.0010≤B≤-0.00075,0.0071≤C≤0.0088 ,-0.0175≤c
4≤-0.0144, form the 4th core region (a
4);
After sandwich layer has deposited, adopt the recessed inner cladding of PCVD process deposits refractive index, the recessed covering inward flange of the refractive index (b of this optical fiber
1) to the first core region (a
1) the distance r at center
5with the 4th core region (a
4) radius r
4pass be: 3.0 μm≤r
5-r
4≤ 6.2 μm, the thickness of the recessed covering of this refractive index meets: 5.0 μm≤r
6-r
5≤ 11.2 μm, the refractive index contrast curve of the recessed covering of this refractive index meets Δ
b(r)=k × r+t curved line relation: k, t are constant, k=5 × 10
-6,-9.46 × 10
-3≤ t≤-2.70 × 10
-3, form r
5with r
6between refractive index recessed area, formed plug;
Adopt OVD technique to spray deposition quartz glass covering (b) outward, the preform diameter dimension that outer spray is formed afterwards is 150 ~ 200mm; Or it is in the quartz glass sleeve of 150 ~ 200mm that the plug that PCVD technique is formed directly is loaded diameter, form preform;
This preform is placed on wire-drawer-tower, under the high temperature of 2000 DEG C ~ about 2300 DEG C, its wire drawing is become external diameter to be 125 microns, internal coating (f
1) diameter is 190 ~ 192.3 microns, external coating (f
2) diameter is the optical fiber of 243.4 ~ 246.5 microns.
7. the manufacture method of low-loss large-effective area single mode fiber as claimed in claim 6, it is characterized in that: described optical fiber is at the loss factor≤0.289dB/km of 1310nm wavelength, loss factor≤the 0.276dB/km of 1383nm wavelength, loss factor≤the 0.187dB/km of loss factor≤0.175dB/km, the 1625nm wavelength of 1550nm wavelength.
8. the manufacture method of low-loss large-effective area single mode fiber as claimed in claim 6, it is characterized in that: described optical fiber is when bending diameter is 15mm × 1 circle, added losses≤the 0.036dB of added losses≤0.025dB, the 1625nm wavelength of 1550nm wavelength.
9. the manufacture method of low-loss large-effective area single mode fiber as claimed in claim 6, it is characterized in that: the basic mode optical power distribution in described optical fiber is flat-top distribution, this optical fiber is 12.0 ~ 15.25 microns in the mode field diameter of 1550nm wavelength, be 110 ~ 183 square microns at the useful area of 1550nm wavelength, the nonlinear factor of this optical fiber is 0.565 ~ 0.936w
-1km
-1, launched power improves 0.4 ~ 2.6dB.
10. the manufacture method of the low-loss large-effective area single mode fiber according to any one of claim 6 to 9, it is characterized in that: described optical fiber is 16.52 ~ 18.12ps/nm/km at the abbe number of 1550nm wavelength, 22 meters of cutoff wavelengths are 1259 ~ 1286nm, zero-dispersion wavelength is 1316.2 ~ 1321.9nm, and the slope of zero-dispersion wavelength is 0.086 ~ 0.091ps/nm
2/ km.
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| CN103869410B (en) | 2014-01-26 | 2015-12-30 | 烽火通信科技股份有限公司 | A kind of have compatible small-bend radius single-mode fiber |
| CN108761635B (en) * | 2018-05-03 | 2019-12-31 | 烽火通信科技股份有限公司 | Double-clad ytterbium-doped optical fiber |
| CN111983748B (en) * | 2020-08-20 | 2022-10-18 | 烽火通信科技股份有限公司 | Energy homogenization optical fiber and preparation method thereof |
| CN112014921B (en) * | 2020-09-14 | 2021-06-11 | 东北大学 | Concave refractive index optical fiber for shaping Gaussian beam into flat-top beam |
| CN113820783B (en) * | 2021-08-12 | 2023-08-25 | 江苏法尔胜光电科技有限公司 | High-power photosensitive erbium-ytterbium co-doped optical fiber and preparation method thereof |
| CN115047559B (en) * | 2022-06-15 | 2023-04-21 | 烽火通信科技股份有限公司 | Multiband attenuation flat optical fiber |
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| CN100371747C (en) * | 2006-03-07 | 2008-02-27 | 江苏亨通光纤科技有限公司 | Bending non-sensitive fibre optical with moderate modulus filed diameter |
| US7876990B1 (en) * | 2009-11-25 | 2011-01-25 | Corning Incorporated | Low loss optical fiber |
| US7929818B1 (en) * | 2010-06-30 | 2011-04-19 | Corning Incorporated | Large effective area fiber with graded index GE-free core |
| CN102944910B (en) * | 2012-10-30 | 2015-07-22 | 长飞光纤光缆股份有限公司 | Single-mode fiber with larger effective area |
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Address after: 430074 Dongxin Road, Guandong science and Technology Park, East Lake Development Zone, Wuhan, Hubei, 5 Co-patentee after: Rui Light Communication Technology Co Ltd Patentee after: Fenghuo Communication Science &. Technology Co., Ltd. Address before: 430074 Dongxin Road, Guandong science and Technology Park, East Lake Development Zone, Wuhan, Hubei, 5 Co-patentee before: Wuhan War Sharp Light Technology Co., Ltd. Patentee before: Fenghuo Communication Science &. Technology Co., Ltd. |