CN111308609A - Large-effective-area low-loss single-mode optical fiber - Google Patents

Large-effective-area low-loss single-mode optical fiber Download PDF

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CN111308609A
CN111308609A CN201911360982.4A CN201911360982A CN111308609A CN 111308609 A CN111308609 A CN 111308609A CN 201911360982 A CN201911360982 A CN 201911360982A CN 111308609 A CN111308609 A CN 111308609A
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layer
optical fiber
doping concentration
refractive index
radius
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CN111308609B (en
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蒋新力
王见青
沈一春
许维维
徐希凯
丁松
唐江
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Zhongtian Technology Advanced Materials Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
    • G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
    • G02B6/02014—Effective area greater than 60 square microns in the C band, i.e. 1530-1565 nm
    • G02B6/02019—Effective area greater than 90 square microns in the C band, i.e. 1530-1565 nm
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03688—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 5 or more layers

Abstract

The invention provides a large-effective-area low-loss single-mode optical fiber which is characterized by sequentially comprising the following components from the center to the periphery: the core layer, the first graded layer, the first inner cladding layer, the second graded layer, the depressed layer, the transition layer and the outer cladding layer. Compared with the prior art, the double graded layers and the double inner cladding layers are designed between the core layer and the depressed layer, so that the stress mutation between the core layer and the depressed layer can be reduced, and the attenuation is reduced; on the other hand, the influence of the concave layer on the key performance of the optical fiber, particularly the mode field diameter and the optical cable cut-off wavelength can be eliminated, the mode field diameter of the optical fiber is increased, and a novel design method of the large-effective-area low-loss single-mode optical fiber is provided.

Description

Large-effective-area low-loss single-mode optical fiber
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a large-effective-area low-loss single-mode optical fiber.
Background
The optical fiber communication network is continuously developed towards the 'three-super' direction of ultra-long distance, ultra-large capacity and ultra-high speed. In recent years, the 400Gbs high-speed optical fiber communication technology has matured gradually and started to enter the field of practical use. The 400Gbs transmission technology can not only increase the network bandwidth, but also greatly reduce the transmission cost of a unit bit through a high-order modulation technology. Transmission systems at 100Gbs and beyond utilize high order modulation modes and coherent digital detection. In this system, dispersion and PMD can be compensated digitally in the electrical domain, but these systems are limited by fiber nonlinearity and fiber loss. The mainstream 400Gbs technology adopts a 16QAM modulation mode, and the OSNR of the system is increased by 6dB compared with 100 Gbs. Calculations and experiments show that if a conventional g.652 optical fiber is used, the unrepeatered transmission distance of a 400Gbs communication system will be only one fourth (about 600-800 km) of that of a 100Gbs system. Because the price of the equipment of the relay regeneration station is very expensive, the G.652 optical fiber is continuously adopted to lay a 400Gbs backbone network, the cost of network and system construction is very high, and the existing G.652 optical fiber can not meet the requirement of the 400Gbs technology at all.
In order to meet and promote the demand for rapid development of optical fiber communication systems, further improvement and optimization of the related performance indexes of optical fibers as transmission media of optical fiber communication networks are required. From the perspective of optical fibers, improvements are needed in two aspects, namely, reduction of optical fiber attenuation and thus reduction of optical power loss of the whole link; on the other hand, the effective area of the optical fiber is increased, the influence of the nonlinear effect of the optical fiber is reduced, and the optical power of the optical fiber is increased, so that the optical signal to noise ratio (OSNR) of the system is improved. In 9 months 2015, IEC has passed a new standard for low loss large effective area g.654e fiber for terrestrial communications, which will become the dominant transmission fiber in 400Gbs long distance communication systems.
The main component of the communication optical fiber is SiO2. By incorporating GeO during the conventional optical fiber preform fabrication process2To increase the refractive index of the core layer, fluorine is dopedThe element lowers the cladding refractive index. Over the 40 years of effort, the fabrication of preforms and optical fibers has reached its ultimate goal. SiO removal2Doped with GeO in addition to intrinsic absorption2Is the most dominant source of attenuation in optical communication fibers, reducing the core layer GeO2The content is the main direction to reduce the attenuation of the fiber. In the presence of low GeO2In core or pure silica core (pure silica core) fiber designs, to ensure the refractive index difference between the core and the cladding, the cladding is typically doped with fluorine to reduce the refractive index. Therefore, in the processes of preform hot working and wire drawing, the viscosity/thermal expansion coefficient between the core layer and the cladding layer is inverted, so that the viscosity/thermal expansion coefficient matching imbalance of the optical fiber structure is caused, larger stress can be generated on the interface of the core layer and the cladding layer, and the attenuation of the optical fiber is increased.
Furthermore, in conventional pure silica core fiber designs (US8315495B2, WO2012/003120a1), the entire cladding uses heavily fluorine-doped silica (refractive index difference less than-0.2%). Recent experiments and research have found (CN104777553A) that only a portion of the cladding layer immediately adjacent to the core layer is required to be made of fluorine-doped quartz, while the outer cladding layer can be made of a conventional high-purity quartz material. The design of the high-viscosity outer cladding material can not only greatly reduce the manufacturing cost, but also be beneficial to reducing the viscosity of other layers (particularly a core layer) in the drawing process, reducing the stress among all the layers and improving the drawing speed (US20150370010A 1). However, if the deep fluorine-doped cladding is not thick enough, the waveguide loss is large, and during transmission, the optical signal will leak into the outer cladding, resulting in very high fiber attenuation. Several published patents suggest that the smallest deep fluorine-doped cladding radius in the pure silicon core g.654 design is 35 μm. However, the leakage of the optical signal is not only dependent on the thickness of the deep fluorine doping, but also influenced by various factors such as the refractive index of the core layer and the cut-off wavelength.
The existing optical fiber with low loss and large effective area generally adopts a step shape, but additional attenuation is easily caused because of stress mutation existing between a core layer and a sunken layer due to rapid change of doping concentration.
The Chinese patent with publication number CN103454719A proposes a design of low-loss single-mode optical fiber, the core layer of which has no GeO2Doping, butThe profile is a typical step-type structure, and the core package interface viscosity/thermal expansion coefficient and the bending performance of the optical fiber are not optimized by adopting a related transition layer or depressed cladding design, so that the optical fiber attenuation and bending loss performance of the structural design is relatively poor.
Chinese patent publication No. CN104749691A describes a low-loss single-mode optical fiber with Ge/F co-doped core layer, which has a multi-step depressed cladding structure in its cross section, but the structure is not very significant for improving the bending loss performance of the optical fiber. Especially when the requirement for mode field diameter is large (>12.0 μm), the cutoff wavelength and bending loss index of g.654e in the IEEE standard cannot be satisfied at the same time.
In addition, the existing optical fiber core layer with low loss and large effective area generally adopts Ge/F codoping, and can realize the lowest attenuation by balancing doping amount and quartz viscosity under the condition that the refractive index difference of the core layer is not changed. In recent years, to further reduce or completely eliminate the amount of Ge doping in the core layer, while reducing the viscosity difference between the core layer and the fluorine-doped layer, a trace amount of alkali metal (usually K) is doped into the core layer2O) has been studied extensively, trace amounts of K2O can significantly reduce the viscosity of the quartz glass and pass K during the drawing process2O gasification diffusion is adopted to eliminate structural defects in quartz glass, which is beneficial to reducing Rayleigh scattering, but because of K2The moisture-absorption instability of O, too high concentration, will lead to the rapid deterioration of the hydrogen deterioration resistance and radiation resistance of the optical fiber. Moreover, the KCl is very easy to hydrolyze, and the optical fiber strength is deteriorated even if the optical fiber material contains trace KCl crystals. In order to prevent the formation of KCl, K is doped2The content of chlorine element in all raw materials is required to be less than 50PPm in the O process, so K2The O doping process is very complex, the concentration control is difficult, and the large-scale repetitive production is difficult to realize.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a large effective area low loss single mode optical fiber, which can realize gradual change of physical properties and doping concentration, thereby reducing stress jump and attenuation.
The invention provides a large-effective-area low-loss single-mode optical fiber, which sequentially comprises the following components from the center to the periphery: the core layer, the first graded layer, the first inner cladding layer, the second graded layer, the depressed layer, the transition layer and the outer cladding layer;
the radius R1 of the core layer is 5-7 μm, and the relative refractive index difference △ 1 between the core layer and the outer cladding layer is 0-0.2%;
the radius of the first gradient layer is R2, the thickness R2-R1 is 0.3-1.5 mu m, the relative refractive index difference △ 2 between the first gradient layer and the outer cladding layer is gradually reduced along the central epitaxial direction, and △ 2 is 0-0.15% in terms of median line;
the radius of the first inner cladding is R3, the thickness R3-R2 is 1-3 μm, and the relative refractive index difference △ 3 between the first inner cladding and the outer cladding is-0.04%;
the radius of the second inner cladding is R4, the thickness R4-R3 is 3-6 μm, and the relative refractive index difference △ 4 between the second inner cladding and the outer cladding is-0.15% -0.25%;
the radius of the second gradient layer is R5, the thickness R5-R4 is 1-6 μm, the relative refractive index difference △ 5 between the second gradient layer and the outer cladding layer is gradually reduced along the central epitaxial direction, and △ 5 is-0.2% -0.3% in terms of median line;
the radius of the concave layer is R6, the thickness R6-R5 is 2-6 μm, and the relative refractive index difference △ 6 between the concave layer and the outer cladding layer is-0.3% -0.4%;
the radius of the transition layer is R7, the thickness R7-R6 is 5-15 μm, and the relative refractive index difference △ 7 between the transition layer and the outer cladding layer is-0.1% -0%;
the radius of the outer cladding is R8, and R8 is 60-65 μm.
Preferably, the relative refractive index difference between the first graded layer and the outer cladding layer at a radius r from the center of the optical fiber is △ 2 (r);
Figure BDA0002337159330000041
wherein, R is more than R1 and less than R2, and R is more than or equal to 0.2 and less than β and less than 3.
Preferably, the relative refractive index difference between the second graded layer and the outer cladding layer at a radius r 'from the center of the optical fiber is △ 5 (r');
Figure BDA0002337159330000042
wherein R4 < R' < R5; gamma is more than or equal to 0.5 and less than or equal to 2.
Preferably, the core layer is doped with element F, P and GeO2A silica glass layer of (a); the molar doping concentration of F in the core layer is 0.01-0.3%; the molar doping concentration of P is 0.01-0.3%; GeO2The molar doping concentration of the silicon carbide is 0.1 to 1 percent;
the molar doping concentration of F in the first gradient layer is 0.1-0.5%; the molar doping concentration of P is 0.01-0.3%; GeO2The molar doping concentration of the silicon carbide is 0.1 to 1.5 percent;
the molar doping concentration of F in the first inner cladding is 0.3% -1.0%; the molar doping concentration of P is 0.01-0.3%; GeO2The molar doping concentration of the silicon carbide is 0.1-0.5 percent;
the molar doping concentration of F in the second inner cladding is 0.5% -1.5%; GeO2The molar doping concentration of the metal is 0-0.2%;
the molar doping concentration of F in the second gradient layer is 0.5% -2%; GeO2The molar doping concentration of the metal is 0-0.2%;
the molar doping concentration of F in the inner recessed layer is 1% -2%; GeO2The molar doping concentration of the metal is 0-0.2%;
the molar doping concentration of F in the transition layer is 0.2% -1.5%; GeO2The molar doping concentration of (A) is 0-0.2%.
Preferably, the application wavelength of the large-effective-area low-loss single-mode optical fiber is 1535-1625 nm.
Preferably, the mode field diameter of the large-effective-area low-loss single-mode optical fiber at 1550nm is 12-13 μm.
Preferably, the attenuation coefficient of the large effective area low loss single mode optical fiber at 1550nm is equal to or less than 0.175 dB/km.
Preferably, the cable cutoff wavelength of the large effective area low loss single mode optical fiber is less than or equal to 1530 nm.
Preferably, the macrobend loss of the large effective area low loss single mode optical fiber is equal to or less than 0.1dB at 1550nm, 10 mm-radius 1 turn.
Preferably, the macrobend loss of the large-effective-area low-loss single-mode optical fiber at 1625nm and 30 mm-radius of 100 turns is equal to or less than 0.1 dB.
The invention provides a large-effective-area low-loss single-mode optical fiber which is characterized by sequentially comprising the following components from the center to the periphery: the core layer, the first graded layer, the first inner cladding layer, the second graded layer, the depressed layer, the transition layer and the outer cladding layer. Compared with the prior art, the double graded layers and the double inner cladding layers are designed between the core layer and the depressed layer, so that the stress mutation between the core layer and the depressed layer can be reduced, and the attenuation is reduced; on the other hand, the influence of the concave layer on the key performance of the optical fiber, particularly the mode field diameter and the optical cable cut-off wavelength can be eliminated, the mode field diameter of the optical fiber is increased, and a novel design method of the large-effective-area low-loss single-mode optical fiber is provided.
Further, the invention adjusts the physical property between the core layer and the recess layer by Ge/P/F co-doping in the core layer, and reduces or eliminates the stress caused by unbalance of the physical property between the core layer and the recess layer, such as viscosity, thermal expansion rate and the like.
Drawings
FIG. 1 is a graph showing the refractive index profile structure of a large effective area low loss single mode optical fiber according to the present invention;
FIG. 2 is a schematic diagram of a process for preparing a large effective area low loss single mode optical fiber according to the present invention;
FIG. 3 is a graph showing a refractive index profile of an optical fiber prepared in example 1 of the present invention;
FIG. 4 is a graph showing a refractive index profile of an optical fiber prepared in comparative example 1 of the present invention;
FIG. 5 is a graph showing a refractive index profile of an optical fiber prepared in comparative example 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a large-effective-area low-loss single-mode optical fiber, which sequentially comprises the following components from the center to the periphery: the core layer, the first graded layer, the first inner cladding layer, the second graded layer, the depressed layer, the transition layer and the outer cladding layer.
Referring to fig. 1, fig. 1 is a refractive index profile of a large effective area low loss single mode optical fiber according to the present invention.
The radius R1 of the core layer of the large-effective-area low-loss single-mode optical fiber provided by the invention is 5-7 microns, preferably 5.5-6.5 microns, and more preferably 5.7-6.3 microns, in some embodiments provided by the invention, the radius R1 of the core layer is preferably 5.7 microns, in some embodiments provided by the invention, the radius R1 of the core layer is preferably 5.8 microns, in other embodiments provided by the invention, the radius R1 of the core layer is preferably 6.3 microns, the relative refractive index difference △ 1 between the core layer and the outer cladding layer is 0-0.2%, preferably 0.1-0.2%, and more preferably 0.12-0.2%, in some embodiments provided by the invention, △ 1 is preferably 0.2%, in some embodiments provided by the invention, △ 1 is preferably 0.15%, in other embodiments provided by the invention, △ 1 is preferably 0.12%, and the core layer is preferably doped with an element F, P and GeO2A silica glass layer of (a); by doping F, P with GeO2To change the refractive index difference; the mol doping concentration of F in the core layer is preferably 0.01-0.3%, more preferably 0.1-0.3%, still more preferably 0.2-0.3%, and most preferably 0.25%; the molar doping concentration of P is 0.01-0.3%, more preferably 0.05-0.2%, still more preferably 0.1-0.15%, most preferably 0.1%; GeO2The molar doping concentration of (b) is 0.1% to 1%, more preferably 0.4% to 1.0%, still more preferably 0.6% to 1.0%, most preferably 0.64% to 0.96%.
A first graded layer is wrapped outside the core layer, the radius of the first graded layer is R2, the thickness of R2-R1 is 0.3-1.5 μm, preferably 0.5-1.5 μm, more preferably 0.6-1.4 μm, the thickness of the first graded layer is preferably 1.4 μm in some embodiments provided by the invention, the thickness of the first graded layer is preferably 1 μm in some embodiments provided by the invention, the thickness of the first graded layer is preferably 0.6 μm in other embodiments provided by the invention, the relative refractive index difference △ of the first graded layer and the outer cladding layer is gradually reduced along the central epitaxial direction, the mean bit line is 0-0.15%, preferably 0.05-0.15%, more preferably 0.05-0.1%, more preferably 0.05-0.08%, in some embodiments provided by the mean bit line is △%, in other embodiments provided by the preferred medium bit line is 0.05-0.08%, the refractive index difference of the outer cladding layer is preferably 0.05-0.08%, in other embodiments provided by the medium bit line is 3963%, the preferred by the radius of the optical fiber 6706%, and the relative refractive index difference is preferably 0.05-3% of the center bit line 3% in other embodiments provided by the invention,
Figure BDA0002337159330000071
wherein R1 < R < R2, 0.2. ltoreq. β < 3, preferably 0.2. ltoreq. β. ltoreq.2, more preferably 0.5. ltoreq. β. ltoreq.1.5, more preferably 0.7. ltoreq. β. ltoreq.1, most preferably β. ltoreq.0.8, the relative refractive index difference with the outer cladding at R. ltoreq.R 1 being the same as △ 1, and the relative refractive index difference with the outer cladding at R. ltoreq.R 2 being the same as △ 3.
The first graded layer is preferably doped with element F, P and GeO2A silica glass layer of (a); wherein, the mol doping concentration of F is preferably 0.1-0.5%, more preferably 0.2-0.5%, and still more preferably 0.25-0.5%; the molar doping concentration of P is preferably 0.01 to 0.3%, more preferably 0.05 to 0.2%, still more preferably 0.1 to 0.15%, and most preferably 0.1%; GeO2The molar doping concentration of (A) is preferably 0.1 to 1.5%, more preferably 0.2 to 1.2%, still more preferably 0.3 to 1.0%, most preferably 0.33 to 0.94%(ii) a In some embodiments of the invention, the first graded layer is GeO2The molar doping concentration of (A) is preferably 0.33% -0.96%; in some embodiments of the invention, the first graded layer is GeO2The molar doping concentration of (A) is preferably 0.33% -0.76%; in other embodiments of the present disclosure, the GeO in the first graded layer2The molar doping concentration of (A) is preferably 0.33% -0.64%; by doping F, P and GeO with different concentrations2The change of the refractive index in the first gradient layer is realized, and at R ═ R1, the doping concentration of various elements is the same as that of the core layer; at R ═ R2, the doping concentration of each element is the same as that of the first inner cladding; the doping concentrations of the various elements between R1 and R2 vary according to the equation above.
The first gradual change layer is wrapped with a first inner cladding; the radius of the first inner cladding is R3, and the thickness R3-R2 is 1-3 μm, preferably 1.5-2.5 μm, more preferably 1.5-2 μm, and still more preferably 1.6-1.9 μm; in some embodiments provided herein, the thickness of the first inner cladding is preferably 1.6 μm; in some embodiments provided herein, the thickness of the first inner cladding is preferably 1.9 μm; in some embodiments provided by the present invention, the thickness of the first inner cladding is preferably 1.7 μm.
The relative refractive index difference △ 3 between the first inner cladding and the outer cladding is-0.04% to 0.04%, preferably-0.04% to 0.02%, more preferably-0.02% to 0%, and most preferably-0.02%.
The first inner cladding layer is preferably doped with element F, P and GeO2A silica glass layer of (a); wherein, the mol doping concentration of F is preferably 0.3-1.0%, more preferably 0.4-0.8%, still more preferably 0.5-0.6%, and most preferably 0.5%; the molar doping concentration of P is preferably 0.01 to 0.3%, more preferably 0.05 to 0.2%, still more preferably 0.1 to 0.15%, and most preferably 0.1%; GeO2The molar doping concentration of (b) is preferably 0.1% to 0.5%, more preferably 0.2% to 0.4%, still more preferably 0.3% to 0.35%, most preferably 0.33%.
The first inner cladding is wrapped by a second inner cladding, the radius of the second inner cladding is R4, the thickness of the second inner cladding is R4-R3 is 3-6 μm, preferably 3.5-5.5 μm, more preferably 4-5 μm, even more preferably 4-4.5 μm, most preferably 4.2-4.3 μm, in some embodiments provided by the invention, the thickness of the second inner cladding is preferably 4.2 μm, in other embodiments provided by the invention, the thickness of the second inner cladding is preferably 4.3 μm, the relative refractive index difference △ 4 between the second inner cladding and the outer cladding is-0.15% -0.25%, preferably-0.16% -0.22%, more preferably-0.18% -0.2%, even more preferably-0.19% -0.2%, in some embodiments provided by the invention, the △ 4 is preferably-0.19%, and in other embodiments provided by the invention, the 3-4.3 μm is preferably △ 4%.
The second inner cladding is preferably doped with elements F and GeO2A silica glass layer of (a); wherein, the mol doping concentration of F is preferably 0.5-1.5%, more preferably 0.7-1.2%, still more preferably 0.8-1.0%, still more preferably 0.9-1.0%, most preferably 0.9-0.94%; GeO2The molar doping concentration of (b) is preferably 0 to 0.2%, more preferably 0.05% to 0.15%, still more preferably 0.1% to 0.15%, most preferably 0.12% to 0.14%.
The second inner cladding layer is wrapped by a second gradient layer, the radius of the second gradient layer is R5, the thickness R5-R4 is 1-6 μm, preferably 1-5 μm, more preferably 1-4 μm, more preferably 2-3 μm, more preferably 2-2.5 μm, and most preferably 2-2.3 μm, in some embodiments, the thickness of the second gradient layer is preferably 2 μm, in other embodiments, the thickness of the second gradient layer is preferably 2.3 μm, the relative refractive index difference △ between the second gradient layer and the outer cladding layer is gradually reduced along the central epitaxial direction, in terms of the median line, △ is-0.2% -0.3%, preferably-0.22% -0.3%, more preferably-0.25% -0.3%, in terms of the median line, in other embodiments, the relative refractive index difference 675 between the second gradient layer and the outer cladding layer is gradually reduced along the central epitaxial direction, in terms of the median line, in terms of the relative refractive index difference 675-0.27%, in terms of the second gradient layer and in terms of the central epitaxial direction, in terms of the relative refractive index difference 675', in terms of the second gradient layer, in terms of the central epitaxial direction, in terms of the second gradient layer, preferably, in terms of the central gradient layer, in terms of the central gradient, the comparative example, the comparative gradient layer, the comparative:
Figure BDA0002337159330000081
wherein R4 < R' < R5, 0.5. ltoreq. gamma.ltoreq.2, preferably 0.5. ltoreq. gamma.ltoreq.1.5, more preferably 0.5. ltoreq. gamma.ltoreq.1.2, still more preferably 0.6. ltoreq. gamma.ltoreq.1, still more preferably 0.6. ltoreq. gamma.ltoreq.0.8, most preferably 0.7, the same relative refractive index difference as the outer cladding at R4 as △ 4, and the same relative refractive index difference as the outer cladding at R5 as △ 6.
The second graded layer is preferably doped with elements F and GeO2A silica glass layer of (a); wherein, the mol doping concentration of F is preferably 0.5-2%, more preferably 0.7-1.6%, still more preferably 0.8-1.5%, most preferably 0.9-1.41%; in some embodiments provided herein, the molar concentration of the F doping is preferably 0.94% to 1.37%; in some embodiments provided herein, the molar concentration of the F doping is preferably 0.90% to 1.37%; in other embodiments provided herein, the molar concentration of the F doping is preferably 0.94% to 1.41%; GeO2The molar doping concentration of (A) is preferably 0-0.2%, more preferably 0-0.1%; by doping different concentrations of F and GeO2The change of the refractive index in the second graded layer is realized, and the doping concentration of various elements is the same as that of the second inner cladding layer at R' ═ R4; at R' ═ R5, the doping concentration of each element was the same as the recess layer; the doping concentrations of the various elements between R4 and R5 vary according to the equation above.
The second graded layer is wrapped by a concave layer, the radius of the concave layer is R6, the thickness of R6-R5 is 2-6 μm, preferably 3-6 μm, in some embodiments provided by the invention, the thickness of the concave layer is preferably 3.9 μm, in some embodiments provided by the invention, the thickness of the concave layer is preferably 7.8 μm, in other embodiments provided by the invention, the thickness of the concave layer is preferably 3.7 μm, the relative refractive index difference △ between the concave layer and the outer cladding layer is-0.3% -0.4%, preferably-0.32% -0.38%, more preferably-0.34% -0.36%, still more preferably-0.34% -0.35%, in some embodiments provided by the invention, the refractive index difference △ 6 is preferably-0.34%, and in other embodiments provided by the invention, the refractive index difference △ is preferably-0.35%.
The recessed layer is preferably doped with elements F and GeO2A silica glass layer of (a); wherein, the mol doping concentration of F is preferably 1-2%, more preferably 1.2-1.8%, still more preferably 1.3-1.5%, most preferably 1.37-1.41%; GeO2The molar doping concentration of (A) is preferably 0 to 0.2%, more preferably 0 to 0.1%.
The concave layer is wrapped by a transition layer, the radius of the transition layer is R7, the thickness of the transition layer is R7-R6 and is 5-15 μm, preferably 7-14 μm, more preferably 8-13 μm, and more preferably 9-12.5 μm, in some embodiments provided by the invention, the thickness of the transition layer is preferably 12.3 μm, in some embodiments provided by the invention, the thickness of the transition layer is preferably 9 μm, in other embodiments provided by the invention, the thickness of the transition layer is preferably 12.5 μm, and the relative refractive index difference △ 7 between the transition layer and the outer cladding layer is-0.1% -0%, preferably-0.09% -0.02%, more preferably-0.07% -0.05%, and more preferably-0.06%.
The transition layer is preferably doped with elements F and GeO2A silica glass layer of (a); wherein, the mol doping concentration of F is preferably 0.2-1.5%, more preferably 0.2-1.0%, still more preferably 0.2-0.8%, still more preferably 0.2-0.6%, still more preferably 0.2-0.4%, most preferably 0.24%; GeO2The molar doping concentration of (A) is preferably 0 to 0.2%, more preferably 0 to 0.1%.
The transition layer is wrapped with an outer cladding layer; the radius of the outer cladding is R8, R8 is 60-65 μm, preferably 61-64 μm, more preferably 62-63 μm, and even more preferably 62.5 μm; nc in FIG. 1 is the outer cladding index; the outer cladding is preferably a pure silicon dioxide layer.
According to the invention, the application wavelength of the large-effective-area low-loss single-mode optical fiber is preferably 1535-1625 nm.
According to the invention, the mode field diameter of the large-effective-area low-loss single-mode optical fiber at 1550nm is preferably 12-13 μm.
According to the present invention, the large effective area low loss single mode optical fiber provided above has an attenuation coefficient at 1550nm equal to or less than 0.175dB/km, and under the conditions of the preferred construction, has an attenuation coefficient at 1550nm equal to or less than 0.170 dB/km.
In accordance with the present invention, the cable cutoff wavelength of the large effective area low loss single mode optical fiber provided above is preferably less than or equal to 1530 nm.
According to the invention, the macrobend loss of the large-effective-area low-loss single-mode optical fiber provided by the invention at 1550nm and 10 mm-radius of 1 turn is equal to or less than 0.1dB, and is equal to or less than 0.05dB under the condition of a preferred structure.
According to the invention, the macrobend loss of the large-effective-area low-loss single-mode optical fiber provided by the invention at 1625nm and 30 mm-radius of 100 turns is equal to or less than 0.1dB, and is equal to or less than 0.05dB under the condition of a preferred structure.
According to the invention, the double graded layers and the double inner cladding layers are designed between the core layer and the depressed layer, so that on one hand, the stress mutation between the core layer and the depressed layer can be reduced, and the attenuation is reduced; on the other hand, the influence of the concave layer on the key performance of the optical fiber, particularly the mode field diameter and the optical cable cut-off wavelength can be eliminated, the mode field diameter of the optical fiber is increased, and a novel design method of the large-effective-area low-loss single-mode optical fiber is provided.
Further, the invention adjusts the physical property between the core layer and the recess layer by Ge/P/F co-doping in the core layer, and reduces or eliminates the stress caused by unbalance of the physical property between the core layer and the recess layer, such as viscosity, thermal expansion rate and the like.
The large-effective-area low-loss single-mode optical fiber provided by the invention can be prepared by MCVD and/or PCVD production processes, and SiO is adjusted in the preparation process2、GeO2The flow ratio of F and P in the deposition process realizes the doping of different element concentrations.
Referring to fig. 2, fig. 2 is a schematic diagram of a process for preparing a large effective area low loss single mode optical fiber according to the present invention.
The invention combines MCVD and PCVD production processes to provide a brand-new design method of a large-effective-area low-loss single-mode optical fiber, wherein a core layer and a gradient layer are codoped by GE/F/P; p doping, even in trace amounts (0.01% molar concentration), can significantly reduce the viscosity of quartz; reducing the fluctuation amount of Ge-doped concentration so as to reduce Rayleigh scattering and simultaneously reduce the stress mismatching between the core layer and the sunken layer; p-doping has been widely used in multimode fibers for nearly 30 years, and numerous studies have found that P-doping is excessive (>2% molar concentration) may cause the fiber to be susceptible to hydrogen degradation, and the P-doped concentration in the multimode fiber is typically controlled below 1.5% molar concentration. In addition, P has a small absorption peak at 1570nm, and the P doping concentration of the optical fiber used at 1550nm cannot be too high; GeO2The doping principle is to reduce the doping amount as much as possible to reduce GeO2Rayleigh scattering loss due to doping; in addition, the attenuation increase caused by optical signal leakage is a big problem and is a main factor for limiting the reduction of the thickness (R6) of the deep fluorine-doped depressed layer, otherwise, light leaks to the outer cladding layer in the transmission process, so that the transmission power is rapidly attenuated, the longer the wavelength is, the easier the leakage is, so the attenuation at 1625nm needs to be noticed when considering the design of the optical fiber; in addition to the thickness of the deep fluorine doped recess layer, another critical leakage influencing factor is the refractive index difference Δ 1 of the core layer and the refractive index difference Δ 7 of the transition layer and the difference between the two.
Through a series of experiments, the concentration of doped P is lower than 0.3 mol%, and meanwhile, the influence of P absorption peak at 1570nm on the attenuation of the optical fibers 1530-1625 can be basically eliminated through co-doping with F. When the concentration of doped P is lower than 0.3% of molar concentration, the P-doped single-mode optical fiber is treated by deuterium, and the hydrogen aging resistance performance of the optical fiber is completely the same as that of a common single-mode optical fiber not doped with P.
The invention adds the double gradual change layer and the double inner cladding between the core layer and the depressed layer, can realize gradual change of physical property and doping concentration, on one hand, reduces stress mutation between the core layer and the depressed layer, and simultaneously can eliminate the influence of the depressed layer on the key performance (mode field diameter and optical cable cut-off wavelength) of the optical fiber, on the other hand, reduces the difficulty of controlling the viscosity matching process, has low manufacturing cost, can obtain reasonable mode field diameter and optical cable cut-off wavelength by adjusting and optimizing the refractive index of the core layer and the inner cladding and the refractive index difference of the core layer and the inner cladding, prepares the optical fiber with the mode field diameter of 12.5 mu m, the effective area of 130 mu m, the @1550nm attenuation of less than 0.170dB/KM, and has low bending loss.
The large effective area low loss single mode fiber provided by the invention belongs to G.654E fiber, and can be used for long-distance, large-capacity and high-speed communication transmission systems on land.
In the present invention, the radius R is the distance from the layer to the center of the optical fiber unless otherwise specified.
In order to further illustrate the present invention, a large effective area low loss single mode optical fiber provided by the present invention is described in detail below with reference to the following examples.
Example 1
The method adopts an MCVD (modified chemical vapor deposition) process in the improved tube to prepare the prefabricated inner core rod, and the inner core rod comprises the following steps: the multilayer ceramic material comprises a core layer, a gradient layer 1, an inner cladding layer 2, a gradient layer 2, a depressed layer and a transition layer (the transition layer is formed by a F-doped quartz tube). Using F-doped quartz tube as deposition substrate tube, SiCl4And O2Is SiO2Raw material of (2), SiF4、SF6、C2F6Or CF4As a fluorine-doped starting material, GECl4As a raw material for GE-doped, POCl3Is a P-doped raw material; using a reciprocating oxyhydrogen blast burner as a heat source, and depositing a depressed layer, a graded layer 2, an inner cladding layer 1, a graded layer 1 and a core layer on the inner surface of a base tube in sequence by controlling the concentration of each doping element in the tube; then fusing the deposition tube to proper inner diameter at high temperature, and introducing SF before the inner diameter is shrunk6(0.050SLM) and O2(0.40SLM) is heated by an oxyhydrogen torch to etch and remove impurities adhered to the inner diameter surface, and finally the impurities are melted and condensed into a solid inner core rod at high temperature. And drawing the outer sleeve (made of pure quartz) serving as an outer cladding layer in a matching manner to obtain the optical fiber. The optical fiber structure sequentially comprises a core layer, a graded layer 1, an inner cladding layer 2, a graded layer 2, a depressed layer, a transition layer and an outer cladding layer from inside to outside, wherein the content of doped elements in each layer is shown in a table 1; the thickness of each layer is shown in Table 2.
Graded layer 1：
Figure BDA0002337159330000121
Gradient layer 2:
Figure BDA0002337159330000122
the optical fiber obtained in example 1 was tested for properties and the results are shown in table 3.
The refractive index profile of the optical fiber obtained in example 1 was measured using a fiber refractive index profile measuring instrument (scanning laser light with a standard wavelength of 632nm), and the refractive index profile thereof was obtained as shown in fig. 3.
As can be seen from tables 2 and 3, the core radius R1 is 5.7 μm, Δ 1 is 0.2%; the thickness R2-R1 of the gradient layer 1 is 1.4 mu m, and the delta 2 is 0.08%; the inner coating thickness R3-R2 is 1.6 μm, and Delta 3 is-0.02%; the thickness R4-R3 of the inner cladding 2 is 4.2 μm, and the delta 4 is-0.20%; the thickness R5-R4 of the gradual change layer 2 is 2.0 μm, and the delta 5 is-0.27%; the thickness of the recessed layer R6-R5 is 3.9 μm, and Δ 6 is-0.34%; the thickness of the transition layer R7-R6 is 12.3 μm, and the relative refractive index difference is delta 7 is-0.06%; the outer cladding layer is pure silicon dioxide with a radius R8 of 62.5 μm; the diameter of a mode field of the drawn optical fiber is 12.7 mu m, the cut-off wavelength of the optical cable is 1495nm, the attenuation of 1550nm and the attenuation of 1625nm are respectively 0.170dB/km and 0.185dB/km, and the macrobend loss test value is less than 0.05 dB.
Example 2
The preparation method is the same as that of the example 1, the MCVD production process in the improved tube is adopted to prepare the prefabricated rod, the wire drawing is carried out, and the outer sleeve is matched to obtain the optical fiber. The optical fiber structure sequentially comprises a core layer, a graded layer 1, an inner cladding layer 2, a graded layer 2, a depressed layer, a transition layer and an outer cladding layer from inside to outside, wherein the content of doped elements in each layer is shown in a table 1; the thickness of each layer is shown in Table 2.
Gradient layer 1: Δ 2(r) ═ 0.15-0.17 × (r-5.8)0.85.8<r<6.8
Gradient layer 2:
Figure BDA0002337159330000131
the optical fiber obtained in example 2 was tested for properties and the results are shown in table 3.
As shown in tables 2 and 3, in example 2, the refractive index Δ 1 of the core layer was reduced from 0.20% to 0.15% (the Ge content of the core layer was reduced proportionally, and the Rayleigh scattering was reduced) based on example 1, and the thicknesses of the depressed layers R6-R5 were increased from 3.9 μm to 7.8 μm to prevent the optical power leakage of the core layer, and other structural parameters were substantially the same as those of example 1. The 1550nm attenuation of the designed optical fiber is reduced to 0.167dB/km, and the bend loss of R10-1@1550nm and R30-100 turns @1625nm are both within 0.05 dB.
Example 3
The preparation method is the same as that of the example 1, the MCVD production process in the improved tube is adopted to prepare the prefabricated rod, the wire drawing is carried out, and the outer sleeve is matched to obtain the optical fiber. The optical fiber structure sequentially comprises a core layer, a graded layer 1, an inner cladding layer 2, a graded layer 2, a depressed layer, a transition layer and an outer cladding layer from inside to outside, wherein the content of doped elements in each layer is shown in a table 1; the thickness of each layer is shown in Table 2.
Gradient layer 1:
Figure BDA0002337159330000132
gradient layer 2:
Figure BDA0002337159330000133
the properties of the optical fiber obtained in example 3 were measured, and the results are shown in Table 3.
As can be seen from tables 2 and 3, in example 3, the core refractive index Δ 1 was reduced to 0.12% and the core radius R1 was 6.3 μm based on example 1, and other structural parameters were substantially the same as those of example 1. The attenuation of 1550nm of the designed optical fiber is increased to 0.177dB/km, the attenuation of 0.208dB/km of 1625nm is obviously increased, the cut-off wavelength of the optical cable is reduced to 1320nm, and the bending loss of R10-1@1550nm and R30-100 circles @1625nm is obviously increased, which indicates that the optical signal has leakage. For low Ge or pure silica core design fibers, optical power leakage is very sensitive to the core refractive index when the fluorine-doped layer is thin, and the thickness or depth of the depressed layer needs to be increased to reduce waveguide loss.
Comparative example 1
The preparation method is the same as that of the example 1, the MCVD production process in the improved tube is adopted to prepare the prefabricated rod, the wire drawing is carried out, and the outer sleeve is matched to obtain the optical fiber. The optical fiber structure sequentially comprises a core layer, a graded layer 1, an inner cladding layer 2, a graded layer 2, a depressed layer and an outer cladding layer from inside to outside, wherein the content of doped elements in each layer is shown in a table 1; the thickness of each layer is shown in Table 2.
Gradient layer 1:
Figure BDA0002337159330000141
gradient layer 2:
Figure BDA0002337159330000142
the optical fiber obtained in comparative example 1 was tested for properties and the results are shown in Table 3.
The refractive index profile of the optical fiber obtained in comparative example 1 was measured with a fiber refractive index profile measuring instrument (scanning laser light with a standard wavelength of 632nm), and the refractive index profile thereof was obtained as shown in fig. 4.
As can be seen from tables 2 and 3, the optical fiber prepared in comparative example 1 has no transition layer, the core refractive index difference Delta 1 is increased to 0.27 for preventing the optical power leakage of the core layer, the Ge doping amount of the core layer is increased for increasing the core refractive index, and the Rayleigh scattering is increased, the attenuation of 1550nm and 1625nm of the designed drawn optical fiber is respectively 0.175dB/km and 0.192dB/km, and the bending loss of R10-1@1550nm and R30-100 @1625nm are both within 0.05 dB.
Comparative example 2
And preparing a prefabricated rod by adopting an MCVD production process, drawing wires, and matching outer sleeves to obtain the optical fiber. The optical fiber structure sequentially comprises a core layer, a graded layer 1, an inner cladding layer 2, a depressed layer, a transition layer and an outer cladding layer from inside to outside, wherein the content of doped elements in each layer is shown in a table 1; the thickness of each layer is shown in Table 2.
Gradient layer 1:
Figure BDA0002337159330000143
there is no graded layer 2.
The optical fiber obtained in comparative example 2 was tested for properties and the results are shown in Table 3.
The refractive index profile of the optical fiber obtained in comparative example 2 was measured using a fiber refractive index profile measuring instrument (scanning laser light with a standard wavelength of 632nm), and the refractive index profile thereof was obtained as shown in fig. 5.
As can be seen from Table 2 and Table 3, comparing example 1, comparative example 2 without the graded layer 2 design, the depressed layer thickness R6-R4 increased to 6.1 μm, and the cable cutoff wavelength increased from 1495 to 1520nm, approaching the upper limit of the standard requirement. Because the GE/F doping concentration between the inner cladding and the 2 and between the inner cladding and the depressed layer has mutation, the viscosity matching between the inner cladding and the depressed layer is poor, the internal part of the core rod is easy to generate structural defects during wire drawing, and the attenuation of @1550nm and @1625nm is respectively increased to 0.174dB/km and 0.190 dB/km.
TABLE 1 concentration of doping elements in each layer of the optical fiber
Figure BDA0002337159330000151
Figure BDA0002337159330000161
TABLE 2 different structural design fiber parameters
Figure BDA0002337159330000162
TABLE 3 test Performance of optical fibers of different structural parameters
Figure BDA0002337159330000163
MFD (mode field diameter) detection criteria in Table 3: GBT-15972.45-2008 optical fiber test method Specification part 45: measurement and test methods for transmission and optical properties and test procedure mode field diameter "; cable cut-off wavelength detection standard: GBT-15972.44-2008 optical fiber test method Specification part 44: transmission and optical properties, and test procedure cut-off wavelengths; attenuation coefficient detection standard: GBT-15972.40-2008 optical fiber test method Specification part 40: measurement test methods and test procedure attenuations of transmission and optical properties "; macrobend loss detection standard: GBT-15972.47-2008 optical fiber test method Specification part 47: transmission and optical properties and macrobend loss.
The hydrogen deterioration resistance of the optical fibers obtained in examples 1 to 3 and comparative examples 1 to 2 was measured, the method of measurement is shown in Table 4, and the results of measurement are shown in Table 5. In order to shorten the test time, an alternative method is adopted, and part 55 of the standard GBT-15972.55-2008 optical fiber test method specification can be consulted specifically: method for measuring environmental properties and test procedure hydro-aging.
TABLE 4 detection method for hydrogen aging resistance
Partial pressure of hydrogen Temperature of Typical time of sample placement
Reference method 1kPa(0.01atm) +23℃±5℃ About (4-6) days
Alternative methods 1kPa(0.01atm) +65℃±2℃ Greater than 16h
TABLE 5 resistance to Hydrogen deterioration Performance test
Sample numbering Hydrogen front 1240 Post-hydrogen 1240 Hydrogen front 1383 Hydrogen post 1383 Δ1240≥0.03 Δ1383≤0.01 Conclusion
Example 1 0.367 0.44 0.391 0.393 0.073 0.002 Qualified
Example 2 0.375 0.439 0.495 0.498 0.064 0.003 Qualified
Example 3 0.375 0.441 0.491 0.494 0.066 0.003 Qualified
Comparative example 1 0.371 0.445 0.493 0.496 0.074 0.003 Qualified
Comparative example 2 0.379 0.444 0.469 0.471 0.065 0.002 Qualified

Claims (10)

1. A large effective area low loss single mode optical fiber comprising in order from the center to the periphery: the core layer, the first graded layer, the first inner cladding layer, the second graded layer, the depressed layer, the transition layer and the outer cladding layer;
the radius R1 of the core layer is 5-7 μm, and the relative refractive index difference △ 1 between the core layer and the outer cladding layer is 0-0.2%;
the radius of the first gradient layer is R2, the thickness R2-R1 is 0.3-1.5 mu m, the relative refractive index difference △ 2 between the first gradient layer and the outer cladding layer is gradually reduced along the central epitaxial direction, and △ 2 is 0-0.15% in terms of median line;
the radius of the first inner cladding is R3, the thickness R3-R2 is 1-3 μm, and the relative refractive index difference △ 3 between the first inner cladding and the outer cladding is-0.04%;
the radius of the second inner cladding is R4, the thickness R4-R3 is 3-6 μm, and the relative refractive index difference △ 4 between the second inner cladding and the outer cladding is-0.15% -0.25%;
the radius of the second gradient layer is R5, the thickness R5-R4 is 1-6 μm, the relative refractive index difference △ 5 between the second gradient layer and the outer cladding layer is gradually reduced along the central epitaxial direction, and △ 5 is-0.2% -0.3% in terms of median line;
the radius of the concave layer is R6, the thickness R6-R5 is 2-6 μm, and the relative refractive index difference △ 6 between the concave layer and the outer cladding layer is-0.3% -0.4%;
the radius of the transition layer is R7, the thickness R7-R6 is 5-15 μm, and the relative refractive index difference △ 7 between the transition layer and the outer cladding layer is-0.1% -0%;
the radius of the outer cladding is R8, and R8 is 60-65 μm.
2. The large effective area low loss single mode optical fiber of claim 1 wherein the relative refractive index difference from the outer cladding at radius r from the center of the fiber in said first graded layer is △ 2 (r);
Figure FDA0002337159320000011
wherein, R is more than R1 and less than R2, and R is more than or equal to 0.2 and less than β and less than 3.
3. The large effective area low loss single mode optical fiber of claim 1 wherein the relative refractive index difference from the outer cladding at radius r 'from the center of the fiber in said second graded layer is △ 5 (r');
Figure FDA0002337159320000021
wherein R4 < R' < R5; gamma is more than or equal to 0.5 and less than or equal to 2.
4. The large effective area low loss single mode optical fiber of claim 1 wherein said core layer is doped with element F, P and GeO2A silica glass layer of (a); the molar doping concentration of F in the core layer is 0.01-0.3%; the molar doping concentration of P is 0.01-0.3%; GeO2The molar doping concentration of the silicon carbide is 0.1 to 1 percent;
the molar doping concentration of F in the first gradient layer is 0.1-0.5%; the molar doping concentration of P is 0.01-0.3%; GeO2The molar doping concentration of the silicon carbide is 0.1 to 1.5 percent;
the molar doping concentration of F in the first inner cladding is 0.3% -1.0%; the molar doping concentration of P is 0.01-0.3%; GeO2The molar doping concentration of the silicon carbide is 0.1-0.5 percent;
the molar doping concentration of F in the second inner cladding is 0.5% -1.5%; GeO2The molar doping concentration of the metal is 0-0.2%;
the molar doping concentration of F in the second gradient layer is 0.5% -2%; GeO2The molar doping concentration of the metal is 0-0.2%;
the molar doping concentration of F in the inner recessed layer is 1% -2%; GeO2The molar doping concentration of the metal is 0-0.2%;
the molar doping concentration of F in the transition layer is 0.2% -1.5%; GeO2The molar doping concentration of (A) is 0-0.2%.
5. The large effective area low loss single mode optical fiber of claim 1 wherein said large effective area low loss single mode optical fiber has an application wavelength of 1535-1625 nm.
6. The large effective area low loss single mode optical fiber of claim 1 wherein said large effective area low loss single mode optical fiber has a mode field diameter at 1550nm of 12-13 μm.
7. The large effective area low loss single mode optical fiber of claim 1 having an attenuation coefficient at 1550nm equal to or less than 0.175 dB/km.
8. The large effective area low loss single mode optical fiber of claim 1 having a cable cutoff wavelength less than or equal to 1530 nm.
9. The large effective area low loss single mode optical fiber of claim 1 having macrobend loss equal to or less than 0.1dB at 1550nm, 10 mm-radius 1 turn.
10. The large effective area low loss single mode optical fiber of claim 1 having macrobend loss equal to or less than 0.1dB at 1625nm, 30 mm-radius 100 turns.
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CN115437060A (en) * 2022-09-05 2022-12-06 江苏亨通光导新材料有限公司 Low-loss bending-resistant single-mode optical fiber and preparation method thereof
CN116880003A (en) * 2023-09-06 2023-10-13 江苏亨通光纤科技有限公司 Anti-radiation ultra-low loss single mode fiber with double-mesa waveguide guide structure
CN116880003B (en) * 2023-09-06 2023-12-15 江苏亨通光纤科技有限公司 Anti-radiation ultra-low loss single mode fiber with double-mesa waveguide guide structure

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