CN103472525A - 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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- CN103472525A CN103472525A CN2013104090089A CN201310409008A CN103472525A CN 103472525 A CN103472525 A CN 103472525A CN 2013104090089 A CN2013104090089 A CN 2013104090089A CN 201310409008 A CN201310409008 A CN 201310409008A CN 103472525 A CN103472525 A CN 103472525A
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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
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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
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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 the present invention relates to is defined as follows:
Deposition: the optical fiber starting material issue at certain environment the technological process that biochemical reaction generates the quartz glass of doping.
Molten contracting: post-depositional hollow glass tube is burnt till gradually under certain thermal source to the technological process of solid glass rod.
Sleeve pipe: the purity quartz glass pipe for high that meets certain sectional area and dimensional homogeneity.
Parent tube: for the purity quartz glass pipe for high of deposition.
Refractive index profile (RIP): the refractive index of optical fiber or preform (comprising fibre-optical mandrel) and the relation curve between its radius.
Relative index of refraction (Δ %):
n wherein
ibe the refractive index of i layer fiber optic materials, i is positive integer, n
0refractive index for pure quartz glass.
Useful area:
Wherein, E is the electric field cross stream component relevant with propagation, and r is fiber radius.
Mode field diameter:
Wherein, E is the electric field cross stream component relevant with propagation, 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 variation of chromatic dispersion versus wavelength.
PCVD: PCVD.
MCVD: improved chemical vapor deposition.
OVD: outside vapour deposition.
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; Simultaneously, along with the evolution of the communication technology, China in 2013 starts scale and disposes the commercial optical fiber telecommunications system of 100G two-forty.Along with the rapid growth of backbone traffic, bottleneck the coming years also likely appear in being applied in of 100G, and the follow-up super 100G that 400G, 1T occur is the transmission system of high transfer rate more.
The gordian technique of high-speed transfer: palarization multiplexing phase-modulation, based on DSP(Digital Signal Processing, digital signal processing) digital coherent reception and third generation super error correction coding etc. progressively solve, for adopting relevant PM-QPSK(Polarization-Multiplexed Quadrature Phase Shift Keying, the palarization multiplexing Quadrature Phase Shift Keying) the 100G communication system of technology, the wavelength dispersion coefficient of 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.
Super 100G communication system has proposed comprehensive requirement to the performance of optical fiber, not only requires the loss of optical fiber 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, and therefore, the loss of expectation optical fiber is as far as possible low to reduce the use of amplifier; And it is non-linear by fiber optic materials and structures shape, current systems technology also can't compensate, especially nonlinear effect is maximum bottleneck and the crucial difficult problem of the long Distance Transmission of the super 100G system of restriction, merely pursue the ultra-low loss of optical fiber and ignored the non-linear of optical fiber, will bring adverse influence to communication system.
The United States Patent (USP) that the patent No. is 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 of 1550nm wavelength Field Diameter, mode field diameter) be 10.7 μ m, the useful area of 1550nm wavelength is 85.143 μ m
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 United States Patent (USP) that the patent No. is 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 there is no the key indexs such as mode field diameter and useful area.
The United States Patent (USP) that the patent No. is US8315493 has proposed a kind of manufacture method of low-loss single-mode optical fiber; it adopts the VAD/MCVD technology; VAD technique preparation for fibre core; the refringence of the relative pure silica cladding of fibre core is lower than 0.2%; inner cladding adopts the 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 of 1383nm loss factor; 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 United States Patent (USP) that the patent No. is US7524780 has proposed a kind of manufacture method 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 that reduces optical fiber reaches the purpose that reduces fibre loss, can break through the ultimate value 0.150dB/km of pure silica glass material loss in theory, but this complex process, easily 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 be not suitable for large-scale production.
The Chinese patent that the patent No. is ZL200410030019.7 has proposed a kind of super large useful area optical fiber, and this optical fiber is greater than 80 μ m at 1310nm wavelength useful area
2, 1550nm is greater than 95 μ m
2, can reach 131.2 μ m
2but the loss factor of its 1310nm wavelength is 0.35dB/km, the 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 larger, dispersion is also bigger than normal, can not meet the demand of high-speed communication system.
The Chinese patent application that application number is 201180031939.9 proposed a kind of have graded index without germanium fibre core large effective area single-mode fiber, this fiber core is not mixed germanium, fiber core refractive index has parabolic distribution, covering adopts quartzy mode of mixing fluorine to carry out, mix the recessed degree of depth of fluorine-0.25%～-0.5%, the 1550nm loss factor is at 0.15dB/km～0.16dB/km, and useful area can reach 110 μ m
2above, but more than the dispersion of its 1550nm reaches 20ps/nm/km, 22 meters optical cables test LP11 mould cutoff wavelengths are more than 1400nm, and this causes 1310nm～1400nm communication band to use.
The Chinese patent application that application number is 201180007436.8 has proposed a kind of large effective area fiber without the germanium fibre core, this fiber core is not mixed germanium, and fibre core has been carried out to segmentation, 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 μ m
2useful area, but its bending loss is larger, the refractive index of the centre of projection has been strengthened optical power density, has increased on the contrary the non-linear of communication system, owing to adopting the pure silicon core and mixing the fluorine covering, production efficiency is low, also is not suitable for large-scale production.
In sum, existing technical scheme is loss and non-linear two key technical problems of resolution system simultaneously, also are not suitable for large-scale production.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology, a kind of low-loss large effective area single-mode fiber and manufacture method thereof are provided, can reduce the scattering loss of optical fiber and the added losses under the fibre-optical bending state, fibre core basic mode electromagnetic field power is distributed and is adjusted into the flat-top distribution by pinnacle, reduce optical power density, increase the useful area of optical fiber, reduce the non-linear of optical fiber, make the 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 be 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 be deposited, and the quartz glass covering adopts outside vapour deposition OVD technique or the manufacture of sleeve pipe technique, wherein:
The refractive index contrast Δ of the first core region and quartz glass covering
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μ m≤r
1≤ 2.0 μ m, c
1for constant, 0.07%≤c
1≤ 0.15%;
The refractive index contrast Δ of the second core region and quartz glass covering
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μ m≤r
2≤ 3.9 μ m, 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
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μ m≤r
3≤ 5.0 μ m, c
3for constant, 0.18%≤c
3≤ 0.32%;
The refractive index contrast Δ of the 4th core region and quartz glass covering
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, 5.0
μm≤r
4≤ 6.5 μ m, 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 of this optical fiber to the first core region center apart from r
5radius r with the 4th core region
4pass be: 3.0 μ m≤r
5-r
4≤ 6.2 μ m, the thickness of the recessed covering of this refractive index meets 5.0 μ m≤r
6-r
5≤ 11.2 μ m, 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 is 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 0.276dB/km of 1383nm wavelength, the loss factor≤0.175dB/km of 1550nm wavelength, the loss factor≤0.187dB/km of 1625nm wavelength.
On the basis of technique scheme, described optical fiber is in the situation that bending diameter is 15mm * 1 circle, the added losses≤0.025dB of 1550nm wavelength, the added losses≤0.036dB of 1625nm wavelength.
On the basis of technique scheme, basic mode optical power distribution in described optical fiber is that flat-top distributes, this optical fiber is 12.0～15.25 microns in the mode field diameter of 1550nm wavelength, useful area at the 1550nm wavelength is 110～183 square microns, and 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 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, generate the quartz glass sandwich layer of mixing germanium under oxyhydrogen flame high temperature, the first core region of deposition sandwich layer and the refractive index contrast Δ of quartz glass covering
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μ m≤r
1≤ 2.0 μ m, 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
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0
μm≤r
2≤ 3.9 μ m, 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
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μ m≤r
3≤ 5.0 μ m, 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
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μ m≤r
4≤ 6.5 μ m, 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 the recessed inner cladding of PCVD process deposits refractive index, the recessed covering inward flange of the refractive index of this optical fiber to the first core region center apart from r
5radius r with the 4th core region
4pass be: 3.0 μ m≤r
5-r
4≤ 6.2 μ m, the thickness of the recessed covering of this refractive index meets: 5.0 μ m≤r
6-r
5≤ 11.2 μ m, 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 is constant, k=5 * 10
-6,-9.46 * 10
-3≤ t≤-2.70 * 10
-3, form r
5with r
6between the refractive index recessed area, form plug;
Adopt OVD technique to spray deposition quartz glass covering outward, the preform diameter dimension that outer spray forms afterwards is 150～200mm; In the quartz glass sleeve that the diameter of perhaps plug of PCVD technique formation directly being packed into is 150～200mm, form preform;
This preform is placed on wire-drawer-tower, and under the high temperature of 2000 ℃～2300 ℃ of left and right, it is that 125 microns, internal coating diameter are the optical fiber that 190～192.3 microns, external coating diameter are 243.4～246.5 microns that its wire drawing is become to external diameter.
On the basis of technique scheme, described optical fiber is at the loss factor≤0.289dB/km of 1310nm wavelength, loss factor≤the 0.276dB/km of 1383nm wavelength, the loss factor≤0.175dB/km of 1550nm wavelength, the loss factor≤0.187dB/km of 1625nm wavelength.
On the basis of technique scheme, described optical fiber is in the situation that bending diameter is 15mm * 1 circle, the added losses≤0.025dB of 1550nm wavelength, the added losses≤0.036dB of 1625nm wavelength.
On the basis of technique scheme, basic mode optical power distribution in described optical fiber is that flat-top distributes, this optical fiber is 12.0～15.25 microns in the mode field diameter of 1550nm wavelength, useful area at the 1550nm wavelength is 110～183 square microns, and 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 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) the present invention distributes fibre core basic mode electromagnetic field power to be adjusted into the flat-top distribution by pinnacle, optical fiber is 12.0～15.25 microns in the mode field diameter of 1550nm wavelength, not only can reduce optical power density, and can increase the useful area of optical fiber: 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 in the present invention, special segmented core structural design effectively reduces optical fiber is mixed the germanium amount, can reduce the scattering loss of optical fiber, 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 0.175dB/km of 1550nm wavelength, the loss factor≤0.187dB/km of 1625nm wavelength.
(4) the present invention can reduce the added losses under the fibre-optical bending state, there is superior bending resistance, this optical fiber is in the situation that bending diameter is 15mm * 1 circle, the added losses≤0.025dB of 1550nm wavelength, the added losses≤0.036dB of 1625nm wavelength.
(5) this optical fiber is 16.52～18.12ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters 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, not only can improve the reliability of communication, and can effectively extend the communication distance of communication system, can meet the application demand of super 100G and 400G high-capacity and high-speed optical communication system, there are application prospect and economic and social benefits preferably.
(7) the present invention can also enhance productivity, and reduces manufacturing cost, easy to operate, is applicable to large-scale production.
The 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 the 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 in the embodiment of the present invention and the curve map of useful area, and wherein g1 is the mode field diameter curve, and g2 is the useful area curve.
Reference numeral: a
1the-the first core region, a
2the-the second core region, a
3the-the three core region, a
4the-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-refractive index recessed covering starting position 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, the recessed covering inward flange of refractive index b
1to the first core region a
1the distance at center is r
5, the recessed covering outward flange of refractive index 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 be deposited, and quartz glass covering b adopts outside vapour deposition (OVD) technique or sleeve pipe technique to manufacture, wherein:
The first core region a
1refractive index contrast Δ with quartz glass covering b
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μ m≤r
1≤ 2.0 μ m, c
1for constant, 0.07%≤c
1≤ 0.15%;
The second core region a
2refractive index contrast Δ with quartz glass covering b
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μ m≤r
2≤ 3.9 μ m, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010;
The 3rd core region a
3refractive index contrast Δ with quartz glass covering b
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μ m≤r
3≤ 5.0 μ m, c
3for constant, 0.18%≤c
3≤ 0.32%;
The 4th core region a
4refractive index contrast Δ with quartz glass covering b
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μ m≤r
4≤ 6.5 μ m, 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 of this optical fiber b
1to the first core region a
1center apart from r
5with the 4th core region a
4radius r
4pass be: 3.0 μ m≤r
5-r
4≤ 6.2 μ m, the thickness of the recessed covering of this refractive index meets 5.0 μ m≤r
6-r
5≤ 11.2 μ m, 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 is constant, k=5 * 10
-6,
-9.46 * 10
-3≤ t≤
-2.70 * 10
-3.
Basic mode optical power distribution in this optical fiber is that flat-top distributes, and this optical fiber is 12.0～15.25 microns in the mode field diameter of 1550nm wavelength, at the useful area of 1550nm wavelength, is 110～183 square microns, 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≤0.289dB/km of 1310nm wavelength, the loss factor≤0.276dB/km of 1383nm wavelength, the loss factor≤0.175dB/km of 1550nm wavelength, the loss factor≤0.187dB/km of 1625nm wavelength.
This optical fiber is in the situation that bending diameter is 15mm * 1 circle, the added losses≤0.025dB of 1550nm wavelength, the added losses≤0.036dB of 1625nm wavelength.
This optical fiber is 16.52～18.12ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters 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.
More than this optical fiber makes optical fiber telecommunications system launched power raising 0.40dB; more than the launched power optimal value promotes 2.0dB; not only can expand transmission range and the transfer rate of communication system; and can promote the reliability of communication system; 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 the quartz glass sandwich layer mix germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1refractive index contrast Δ with quartz glass covering b
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μ m≤r
1≤ 2.0 μ m, c
1for constant, 0.07%≤c
1≤ 0.15%, this part is corresponding to the r in Fig. 2
1refractive index curve, form the first core region a in Fig. 1
1; The second core region a
2refractive index contrast Δ with quartz glass covering b
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μ m≤r
2≤ 3.9 μ m, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010, this part is corresponding to the r in Fig. 2
2refractive index curve, form the second core region a in Fig. 1
2; The 3rd core region a
3refractive index contrast Δ with quartz glass covering b
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μ m≤r
3≤ 5.0 μ m, c
3for constant, 0.18%≤c
3≤ 0.32%, this part is corresponding to the r in Fig. 2
3refractive index curve, form the 3rd core region a in Fig. 1
3; The 4th core region a
4refractive index contrast Δ with quartz glass covering b
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μ m≤r
4≤ 6.5 μ m, B, C, c
4be constant ,-0.0010≤B≤-0.00075,0.0071≤C≤0.0088 ,-0.0175≤c
4≤-0.0144, this part is corresponding to the r in Fig. 2
4refractive index curve, form 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 inward flange of the refractive index of this optical fiber b
1to the first core region a
1center apart from r
5with the 4th core region a
4radius r
4pass be: 3.0 μ m≤r
5-r
4≤ 6.2 μ m, the thickness of the recessed covering of this refractive index meets: 5.0 μ m≤r
6-r
5≤ 11.2 μ m, 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 is constant, k=5 * 10
-6,-9.46 * 10
-3≤ t≤-2.70 * 10
-3, the r in pie graph 2
5with r
6between the refractive index recessed area, the recessed covering inward flange of the refractive index b in corresponding diagram 1 in quartz glass covering b
1with the recessed covering outward flange of the refractive index b in quartz glass covering b
2between the refractive index zone, form 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 forms afterwards is 150～200mm; In the quartz glass sleeve that the diameter of perhaps plug of PCVD technique formation directly being packed into is 150～200mm, form preform.
This preform is placed on wire-drawer-tower, and under the high temperature of 2000 ℃～2300 ℃ of left and right, it is 125 microns, internal coating f that its wire drawing is become to external diameter
1diameter is 190～192.3 microns, external coating f
2the optical fiber that diameter is 243.4～246.5 microns.
Through test, basic mode optical power distribution in this optical fiber is that flat-top distributes, this optical fiber is 12.0～15.25 microns in the mode field diameter of 1550nm wavelength, at the useful area of 1550nm wavelength, is 110～183 square microns, 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≤0.289dB/km of 1310nm wavelength, the loss factor≤0.276dB/km of 1383nm wavelength, the loss factor≤0.175dB/km of 1550nm wavelength, the loss factor≤0.187dB/km of 1625nm wavelength.
This optical fiber is in the situation that bending diameter is 15mm * 1 circle, the added losses≤0.025dB of 1550nm wavelength, the added losses≤0.036dB of 1625nm wavelength.
This optical fiber is 16.52～18.12ps/nm/km at the abbe number of 1550nm wavelength, and 22 meters 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.
Below by 3 specific embodiments, be elaborated.
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 the quartz glass sandwich layer mix germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1refractive index contrast Δ with quartz glass covering b
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, r
1=1.50 μ m, c
1=0.10%, this part is corresponding to the r in Fig. 2
1refractive index curve, form the first core region a in Fig. 1
1; The second core region a
2refractive index contrast Δ with quartz glass covering b
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, r
2=3.0 μ m, A=0.0022, c
2=-0.00006, this part is corresponding to the r in Fig. 2
2refractive index curve, form the second core region a in Fig. 1
2; The 3rd core region a
3refractive index contrast Δ with quartz glass covering b
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, r
3=4.6 μ m, c
3=0.22%, this part is corresponding to the r in Fig. 2
3refractive index curve, form the 3rd core region a in Fig. 1
3; The 4th core region a
4refractive index contrast Δ with quartz glass covering b
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, r
4=6.0 μ m, B=-0.00089, C=0.0080, c
4=-0.0160, this part is corresponding to the r in Fig. 2
4refractive index curve, form 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 of this optical fiber recessed covering starting position and the first core region a
1center apart from r
5with the 4th core region a
4radius r
4pass be: r
5-r
4=3.0 μ m, the thickness of the recessed covering of this refractive index meets: r
6-r
5=9.2 μ m, 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 the refractive index recessed area, the recessed covering inward flange of the refractive index b in corresponding diagram 1 in quartz glass covering b
1with the recessed covering outward flange of the refractive index b in quartz glass covering b
2between the refractive index zone, form 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 forms afterwards is 150mm.
This preform is placed on wire-drawer-tower, and under the high temperature of 2000 ℃ of left and right, it is 125 microns, internal coating f that its wire drawing is become to external diameter
1diameter is 190 microns, external coating f
2the optical fiber that diameter is 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 that pinnacle distributes.
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 has obviously reduced the nonlinear factor of optical fiber, and launched power promotes 2.1dB.
The mode field diameter of this optical fiber and useful area curve 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 μ m in the mode field diameter of 1550nm wavelength, and useful area is 166.5 μ m
2; And conventional G.652 single-mode fiber is 10.40 ± 0.5 μ m in the mode field diameter of 1550nm wavelength, useful area is 80 μ m
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 0.173dB/km, and the loss factor of 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 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 is in the situation that bending diameter is 15mm * 1 circle, and the added losses of 1550nm wavelength are 0.016dB, and the added losses of 1625nm wavelength are 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 |
| The 1550nm useful area | 166.5 | 2μm |
| 22 meters cutoff wavelengths | 1260 | nm |
| Zero-dispersion wavelength | 1320.8 | nm |
| Zero-dispersion slop | 0.086 | ps/nm 2/km |
| The 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 |
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 the quartz glass sandwich layer mix germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1refractive index contrast Δ with quartz glass covering b
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, r
1=1.0 μ m, c
1=0.07%, this part is corresponding to the r in Fig. 2
1refractive index curve, form the first core region a in Fig. 1
1; The second core region a
2refractive index contrast Δ with quartz glass covering b
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, r
2=3.9 μ m, A=0.0019, c
2=-0.00001, this part is corresponding to the r in Fig. 2
2refractive index curve, form the second core region a in Fig. 1
2; The 3rd core region a
3refractive index contrast Δ with quartz glass covering b
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, r
3=2.5 μ m, c
3=0.18%, this part is corresponding to the r in Fig. 2
3refractive index curve, form the 3rd core region a in Fig. 1
3; The 4th core region a
4refractive index contrast Δ with quartz glass covering b
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, r
4=5.0 μ m, B=-0.00075, C=0.0088, c
4=-0.0144, this part is corresponding to the r in Fig. 2
4refractive index curve, form 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 of this optical fiber recessed covering starting position and the first core region a
1center apart from r
5with the 4th core region a
4radius r
4pass be: r
5-r
4=6.2 μ m, the thickness of the recessed covering of this refractive index meets: r
6-r
5=5.0 μ m, 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 the refractive index recessed area, the recessed covering inward flange of the refractive index b in corresponding diagram 1 in quartz glass covering b
1with the recessed covering outward flange of the refractive index b in quartz glass covering b
2between the refractive index zone, form plug, the plug that PCVD technique is formed is directly packed in the quartz glass sleeve that diameter is 165mm, forms preform.
This preform is placed on wire-drawer-tower, and under the high temperature of 2200 ℃ of left and right, it is 125 microns, internal coating f that its wire drawing is become to external diameter
1diameter is 192.2 microns, external coating f
2the optical fiber that diameter is 246.5 microns.
Through test, the basic mode optical power distribution in this optical fiber is that flat-top distributes, and this optical fiber is 12.1 μ m in the mode field diameter of 1550nm wavelength, and useful area is 110.6 μ m
2; The nonlinear factor of this optical fiber is 0.936w
-1km
-1, launched power promotes 0.40dB; This optical fiber is 0.282dB/km at the loss factor of 1310nm wavelength, and the loss factor of 1383nm wavelength is 0.271dB/km, and the loss factor of 1550nm wavelength is 0.170dB/km, and the loss factor of 1625nm wavelength is 0.183dB/km.
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 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 is in the situation that bending diameter is 15mm * 1 circle, and the added losses of 1550nm wavelength are 0.022dB, and the added losses of 1625nm wavelength are 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 |
| The 1550nm useful area | 110.6 | μm 2 |
| 22 meters cutoff wavelengths | 1286 | nm |
| Zero-dispersion wavelength | 1321.9 | nm |
| Zero-dispersion slop | 0.091 | ps/nm 2/km |
| The 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 |
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 the quartz glass sandwich layer mix germanium under oxyhydrogen flame high temperature, the first core region a of deposition sandwich layer
1refractive index contrast Δ with quartz glass covering b
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, r
1=2.0 μ m, c
1=0.15%, this part is corresponding to the r in Fig. 2
1refractive index curve, form the first core region a in Fig. 1
1; The second core region a
2refractive index contrast Δ with quartz glass covering b
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, r
2=3.0 μ m, A=0.0025, c
2=-0.00010, this part is corresponding to the r in Fig. 2
2refractive index curve, form the second core region a in Fig. 1
2; The 3rd core region a
3refractive index contrast Δ with quartz glass covering b
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, r
3=5.0 μ m, c
3=0.32%, this part is corresponding to the r in Fig. 2
3refractive index curve, form the 3rd core region a in Fig. 1
3; The 4th core region a
4refractive index contrast Δ with quartz glass covering b
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, r
4=6.5 μ m, B=-0.0010, C=0.0071, c
4=-0.0175, this part is corresponding to the r in Fig. 2
4refractive index curve, form 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 of this optical fiber recessed covering starting position and the first core region a
1center apart from r
5with the 4th core region a
4radius r
4pass be: r
5-r
4=4.6 μ m, the thickness of the recessed covering of this refractive index meets: r
6-r
5=11.2 μ m, 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 the refractive index recessed area, the recessed covering inward flange of the refractive index b in corresponding diagram 1 in quartz glass covering b
1with the recessed covering outward flange of the refractive index b in quartz glass covering b
2between the refractive index zone, form 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 forms afterwards is 200mm.
This preform is placed on wire-drawer-tower, and under the high temperature of 2300 ℃ of left and right, it is 125 microns, internal coating f that its wire drawing is become to external diameter
1diameter is 192.3 microns, external coating f
2the optical fiber that diameter is 243.4 microns.
Through test, the basic mode optical power distribution in this optical fiber is that flat-top distributes, and in the mode field diameter of 1550nm wavelength, is 15.25 μ m, and useful area is 183 μ m
2, nonlinear factor is 0.565w
-1km
-1, launched power promotes 2.6dB.This optical fiber is 0.289dB/km at the loss factor of 1310nm wavelength, and the loss factor of 1383nm wavelength is 0.276dB/km, and the loss factor of 1550nm wavelength is 0.175dB/km, and the loss factor of 1625nm wavelength is 0.187dB/km.
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 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 is in the situation that bending diameter is 15mm * 1 circle, and the added losses of 1550nm wavelength are 0.025dB, and the added losses of 1625nm wavelength are 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 |
| The 1550nm useful area | 183.0 | μm 2 |
| 22 meters cutoff wavelengths | 1259.2 | nm |
| Zero-dispersion wavelength | 1316.2 | nm |
| Zero-dispersion slop | 0.087 | ps/nm 2/km |
| The 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 are revised and modification belongs within the scope of the claims in the present invention and equivalent technologies thereof, these modifications and modification are also within protection scope of the present invention.
The prior art that the content of not describing in detail in instructions is known to the skilled person.
Claims (10)
1. a low-loss large effective area single-mode fiber, comprise the 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: inner the first core region (a be arranged in order from the inside to the outside that also comprises of described quartz glass covering (b)
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) center the distance be r
5, the recessed covering outward flange of refractive index (b
2) to the first core region (a
1) center the distance be r
6, the recessed covering of refractive index adopts PCVD PCVD technique to be deposited, and quartz glass covering (b) adopts outside vapour deposition OVD technique or the manufacture of sleeve pipe technique, wherein:
The first core region (a
1) with the refractive index contrast Δ of quartz glass covering (b)
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μ m≤r
1≤ 2.0 μ m, c
1for constant, 0.07%≤c
1≤ 0.15%;
The second core region (a
2) with the refractive index contrast Δ of quartz glass covering (b)
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μ m≤r
2≤ 3.9 μ m, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010;
The 3rd core region (a
3) with the refractive index contrast Δ of quartz glass covering (b)
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μ m≤r
3≤ 5.0 μ m, c
3for constant, 0.18%≤c
3≤ 0.32%;
The 4th core region (a
4) with the refractive index contrast Δ of quartz glass covering (b)
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μ m≤r
4≤ 6.5 μ m, 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 of this optical fiber (b
1) to the first core region (a
1) center apart from r
5with the 4th core region (a
4) radius r
4pass be: 3.0 μ m≤r
5-r
4≤ 6.2 μ m, the thickness of the recessed covering of this refractive index meets 5.0 μ m≤r
6-r
5≤ 11.2 μ m, 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 is 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 0.175dB/km of 1550nm wavelength, the loss factor≤0.187dB/km of 1625nm wavelength.
3. low-loss large effective area single-mode fiber as claimed in claim 1 is characterized in that: described optical fiber is in the situation that bending diameter is 15mm * 1 circle, the added losses≤0.025dB of 1550nm wavelength, the added losses≤0.036dB of 1625nm 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 that flat-top distributes, this optical fiber is 12.0～15.25 microns in the mode field diameter of 1550nm wavelength, useful area at the 1550nm wavelength is 110～183 square microns, and the nonlinear factor of this optical fiber is 0.565～0.936w
-1km
-1, launched power improves 0.4～2.6dB.
5. low-loss large effective area single-mode fiber as described as any one in claim 1 to 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 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 the described low-loss large effective area of any one single-mode fiber in claim 1 to 5, is characterized in that, 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, generates the quartz glass sandwich layer of 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)
1(r) variation with fiber core radius r meets " Δ
1(r)=c
1" relation curve: 0≤r≤r
1, 1.0 μ m≤r
1≤ 2.0 μ m, c
1for constant, 0.07%≤c
1≤ 0.15%, form the first core region (a
1); The second core region (a
2) with the refractive index contrast Δ of quartz glass covering (b)
2(r) variation with fiber core radius r meets " Δ
2(r)=A * ln (r)+c
2" relation curve: r
1≤ r≤r
2, 3.0 μ m≤r
2≤ 3.9 μ m, A, c
2be constant, 0.0019≤A≤0.0025 ,-0.00001≤c
2≤-0.00010, form the second core region (a
2); The 3rd core region (a
3) with the refractive index contrast Δ of quartz glass covering (b)
3(r) variation with fiber core radius r meets " Δ
3(r)=c
3" relation curve: r
2≤ r≤r
3, 2.5 μ m≤r
3≤ 5.0 μ m, c
3for constant, 0.18%≤c
3≤ 0.32%, form the 3rd core region (a
3); The 4th core region (a
4) with the refractive index contrast Δ of quartz glass covering (b)
4(r) variation with fiber core radius r meets " Δ
4(r)=B * r
2+ C * r+c
4" relation curve: r
3≤ r≤r
4, 5.0 μ m≤r
4≤ 6.5 μ m, 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 of this optical fiber (b
1) to the first core region (a
1) center apart from r
5with the 4th core region (a
4) radius r
4pass be: 3.0 μ m≤r
5-r
4≤ 6.2 μ m, the thickness of the recessed covering of this refractive index meets: 5.0 μ m≤r
6-r
5≤ 11.2 μ m, 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 is constant, k=5 * 10
-6,-9.46 * 10
-3≤ t≤-2.70 * 10
-3, form r
5with r
6between the refractive index recessed area, form plug;
Adopt OVD technique to spray deposition quartz glass covering (b) outward, the preform diameter dimension that outer spray forms afterwards is 150～200mm; In the quartz glass sleeve that the diameter of perhaps plug of PCVD technique formation directly being packed into is 150～200mm, form preform;
This preform is placed on wire-drawer-tower, and under the high temperature of 2000 ℃～2300 ℃ of left and right, it is 125 microns, internal coating (f that its wire drawing is become to external diameter
1) diameter is 190～192.3 microns, external coating (f
2) the diameter optical fiber that is 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 0.175dB/km of 1550nm wavelength, the loss factor≤0.187dB/km of 1625nm 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 in the situation that bending diameter is 15mm * 1 circle, added losses≤the 0.025dB of 1550nm wavelength, the added losses≤0.036dB of 1625nm 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 that flat-top distributes, this optical fiber is 12.0～15.25 microns in the mode field diameter of 1550nm wavelength, useful area at the 1550nm wavelength is 110～183 square microns, and 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 low-loss large effective area single-mode fiber as described as any one in 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 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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| WO2015109861A1 (en) * | 2014-01-26 | 2015-07-30 | 烽火通信科技股份有限公司 | Small bending radius single-mode optical fiber with compatibility |
| CN108761635A (en) * | 2018-05-03 | 2018-11-06 | 烽火通信科技股份有限公司 | A kind of Double Cladding Ytterbium Doped Fiber |
| CN111983748A (en) * | 2020-08-20 | 2020-11-24 | 烽火通信科技股份有限公司 | Energy homogenization optical fiber and preparation method thereof |
| CN112014921A (en) * | 2020-09-14 | 2020-12-01 | 东北大学 | Concave refractive index optical fiber for shaping Gaussian beam into flat-top beam |
| CN113820783A (en) * | 2021-08-12 | 2021-12-21 | 江苏法尔胜光电科技有限公司 | Photosensitive erbium-ytterbium co-doped optical fiber for high power and preparation method thereof |
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| WO2015109861A1 (en) * | 2014-01-26 | 2015-07-30 | 烽火通信科技股份有限公司 | Small bending radius single-mode optical fiber with compatibility |
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| CN111983748A (en) * | 2020-08-20 | 2020-11-24 | 烽火通信科技股份有限公司 | Energy homogenization optical fiber and preparation method thereof |
| 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 |
| CN112014921A (en) * | 2020-09-14 | 2020-12-01 | 东北大学 | Concave refractive index optical fiber for shaping Gaussian beam into flat-top beam |
| 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 |
| CN113820783A (en) * | 2021-08-12 | 2021-12-21 | 江苏法尔胜光电科技有限公司 | Photosensitive erbium-ytterbium co-doped optical fiber for high power and preparation method thereof |
| 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 |
| WO2023240880A1 (en) * | 2022-06-15 | 2023-12-21 | 烽火通信科技股份有限公司 | Multiband attenuation flattened fiber |
| CN115991568A (en) * | 2023-02-21 | 2023-04-21 | 锐光信通科技有限公司 | Absorption graded ytterbium-doped optical fiber, preform and preparation method thereof |
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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. |