阅读说明：本技术 一种弯曲不敏感单模光纤 (Bending insensitive single mode fiber ) 是由 钟媛 王胜明 姚艳 劳雪刚 沈震强 肖华 于 2019-11-29 设计创作，主要内容包括：本发明提供了一种弯曲不敏感单模光纤,其各类指标同时符合G657A2和G657B3光纤的标准,宏弯性能也同时符合G657A2和G657B3光纤的标准,该光纤既可作为G657A2光纤使用也可作为G657B3光纤使用。其包括中心的芯层以及围绕并接触所述芯层的包层,所述包层包括内包层和外包层；所述内包层包括第一内包层、第二内包层、第三内包层、第四内包层,所述芯层的相对折射率差Δ1为0.32％～0.38％,所述第一内包层的相对折射率差Δ2为-0.01％～-0.06％,所述第三内包层的相对折射率差Δ3为-0.35％～-0.45％,所述第二内包层的相对折射率自内而外由Δ2线性下降为Δ3,所述第四内包层的相对折射率自内而外由Δ3线性上升为0。(The invention provides a bending insensitive single-mode optical fiber, which has various indexes simultaneously in accordance with the standards of G657A2 and G657B3 optical fibers, has macrobend performance in accordance with the standards of G657A2 and G657B3 optical fibers, and can be used as the G657A2 optical fiber or the G657B3 optical fiber. Comprising a central core layer and a cladding layer surrounding and contacting the core layer, the cladding layer comprising an inner cladding layer and an outer cladding layer; the inner cladding comprises a first inner cladding, a second inner cladding, a third inner cladding and a fourth inner cladding, wherein the relative refractive index difference delta 1 of the core layer is 0.32% -0.38%, the relative refractive index difference delta 2 of the first inner cladding is-0.01% -0.06%, the relative refractive index difference delta 3 of the third inner cladding is-0.35% -0.45%, the relative refractive index of the second inner cladding is linearly reduced from inside to outside to delta 3 from delta 2, and the relative refractive index of the fourth inner cladding is linearly increased from inside to outside to 0 from delta 3.)

1. A bend insensitive single mode optical fiber, comprising: comprising a central core layer and a cladding layer surrounding and contacting the core layer, the cladding layer comprising an inner cladding layer and an outer cladding layer; the inner cladding comprises a first inner cladding, a second inner cladding, a third inner cladding and a fourth inner cladding, wherein the relative refractive index difference delta 1 of the core layer is 0.32% -0.38%, the relative refractive index difference delta 2 of the first inner cladding is-0.01% -0.06%, the relative refractive index difference delta 3 of the third inner cladding is-0.35% -0.45%, the relative refractive index of the second inner cladding is linearly reduced from inside to outside to delta 3 from delta 2, and the relative refractive index of the fourth inner cladding is linearly increased from inside to outside to 0 from delta 3; the radius of the whole optical fiber is 125 mu m, the radius R1 of the core layer is 3.2 mu m to 3.6 mu m, the outer radius of the first inner cladding layer is R2, the outer radius of the second inner cladding layer is R3, the outer radius of the third inner cladding layer is R4, the outer radius of the fourth inner cladding layer is R5, and the numerical values satisfy the following relations that R2/R1 is 2.2 to 3.00, R5/R1 is 4.0 to 5.2, R3-R2 is 1 to 3 mu m, and R5-R4 is 1 to 3 mu m.

2. The bend insensitive single mode optical fiber of claim 1, wherein: the outer cladding layer is made of pure silicon dioxide material.

3. The bend insensitive single mode optical fiber of claim 1, wherein: the mode field diameter of the optical fiber at 1310nm is 8.2-8.8 mu m, and the cabled cutoff wavelength is 1200-1260 nm.

4. The bend insensitive single mode optical fiber of claim 1, wherein: the zero dispersion slope of the optical fiber is less than or equal to 0.092 ps/(nm)²Km), typical value ≦ 0.090 ps/(nm)²·km)。

5. The bend insensitive single mode optical fiber of claim 1, wherein: the zero dispersion wavelength of the optical fiber is 1300-1324 nm, and the typical value is 1311 nm.

6. The bend insensitive single mode optical fiber of claim 1, wherein: the macrobending performance of the optical fiber is as follows: the macrobend additional loss of 1550nm and 1625nm of a bending radius of 15mm wound by 10 turns is respectively less than 0.03dB/km and 0.1 dB/km; the macrobend additional loss of 1550nm and 1625nm of a bending radius of 10mm wound around 1 circle is respectively less than 0.03dB/km and 0.1 dB/km; the 7.5mm macrobend additional loss of 1550nm and 1625nm of the bending radius winding 1 circle is respectively less than 0.08dB/km and 0.25 dB/km; the macrobend additional losses at 1550nm and 1625nm for a 5mm bend radius around 1 turn are less than 0.15dB/km and 0.45dB/km, respectively.

Technical Field

The invention relates to the technical field of single-mode fiber waveguide structures, in particular to a bending insensitive single-mode fiber.

Background

In recent years, FTTH (fiber To The Home) receives more and more attention, however, The application scene of FTTH is more complex, for example, in buildings, streets and houses, optical fiber nodes are more, and zigzag wiring is more, and 5 mm-15 mm is a common bending radius when in actual wiring; meanwhile, in an actual communication line, the transmission performance of the system can be better ensured only when the bending loss is less than 0.1dB/turn, the conventional G652D optical fiber cannot meet the requirement, and the bending insensitive optical fiber is suitable for various wiring in a building of an optical fiber access network terminal, so that the bending insensitive optical fiber is widely applied to FTTH.

At present, there are few reports about compatible optical fibers of G657A2 and G657B3, the G657B3 optical fiber has more excellent macrobending performance than the G657A2 optical fiber, and generally, the zero dispersion slope and the zero dispersion wavelength of the G657B3 optical fiber are larger than those of the G657A2, and the two are difficult to be compatible.

Therefore, a single-mode optical fiber which can be simultaneously suitable for a G657B3 optical fiber and a G657A2 optical fiber needs to be developed.

Disclosure of Invention

Aiming at the problems, the invention provides a bending insensitive single-mode optical fiber, various indexes of which simultaneously accord with the standards of G657A2 and G657B3 optical fibers, and the macro-bending performance of which simultaneously accords with the standards of G657A2 and G657B3 optical fibers, and the optical fiber can be used as a G657A2 optical fiber or a G657B3 optical fiber.

A bend insensitive single mode optical fiber, comprising: comprising a central core layer and a cladding layer surrounding and contacting the core layer, the cladding layer comprising an inner cladding layer and an outer cladding layer; the inner cladding comprises a first inner cladding, a second inner cladding, a third inner cladding and a fourth inner cladding, wherein the relative refractive index difference delta 1 of the core layer is 0.32% -0.38%, the relative refractive index difference delta 2 of the first inner cladding is-0.01% -0.06%, the relative refractive index difference delta 3 of the third inner cladding is-0.35% -0.45%, the relative refractive index of the second inner cladding is linearly reduced from inside to outside to delta 3 from delta 2, and the relative refractive index of the fourth inner cladding is linearly increased from inside to outside to 0 from delta 3; the radius of the whole optical fiber is 125 mu m, the radius R1 of the core layer is 3.2 mu m to 3.6 mu m, the outer radius of the first inner cladding layer is R2, the outer radius of the second inner cladding layer is R3, the outer radius of the third inner cladding layer is R4, the outer radius of the fourth inner cladding layer is R5, and the numerical values satisfy the following relations that R2/R1 is 2.2 to 3.00, R5/R1 is 4.0 to 5.2, R3-R2 is 1 to 3 mu m, and R5-R4 is 1 to 3 mu m.

It is further characterized in that:

the outer cladding layer is made of pure silicon dioxide material;

the mode field diameter of the optical fiber at 1310nm is 8.2-8.8 mu m, and the cabled cutoff wavelength is 1200-1260 nm;

the zero dispersion slope of the optical fiber is less than or equal to 0.092 ps/(nm)²Km), typical value ≦ 0.090 ps/(nm)²·km)；

The zero dispersion wavelength of the optical fiber is 1300-1324 nm, and the typical value is 1311 nm;

the macrobending performance of the optical fiber is as follows: the macrobend additional loss of 1550nm and 1625nm of a bending radius of 15mm wound by 10 turns is respectively less than 0.03dB/km and 0.1 dB/km; the macrobend additional loss of 1550nm and 1625nm of a bending radius of 10mm wound around 1 circle is respectively less than 0.03dB/km and 0.1 dB/km; the 7.5mm macrobend additional loss of 1550nm and 1625nm of the bending radius winding 1 circle is respectively less than 0.08dB/km and 0.25 dB/km; the macrobend additional losses at 1550nm and 1625nm for a 5mm bend radius around 1 turn are less than 0.15dB/km and 0.45dB/km, respectively.

After the invention is adopted, the second inner cladding and the fourth inner cladding are inner claddings with the relative refractive indexes which are linearly gradually changed from inside to outside, and by combining the relative refractive index numerical values and the corresponding thicknesses of the adjacent layers, various indexes of the second inner cladding and the fourth inner cladding simultaneously accord with the standards of G657A2 and G657B3 optical fibers, the macrobending performance also accords with the standards of G657A2 and G657B3 optical fibers, and the optical fibers can be used as G657A2 optical fibers and G657B3 optical fibers.

Drawings

FIG. 1 is a schematic representation of the refractive index profile of a cross section of a single mode optical fiber of the present invention.

Detailed Description

A bend insensitive single mode optical fiber, comprising: the cladding comprises an inner cladding and an outer cladding; the inner cladding comprises a first inner cladding, a second inner cladding, a third inner cladding and a fourth inner cladding, the relative refractive index difference delta 1 of the core layer is 0.32% -0.38%, the relative refractive index difference delta 2 of the first inner cladding is-0.01% -0.06%, the relative refractive index difference delta 3 of the third inner cladding is-0.35% -0.45%, the relative refractive index of the second inner cladding is linearly reduced from inside to outside to delta 3 from delta 2, and the relative refractive index of the fourth inner cladding is linearly increased from inside to outside to 0 from delta 3; the radius of the whole optical fiber is 125 mu m, the radius R1 of the core layer is 3.2 mu m to 3.6 mu m, the outer radius value of the first inner cladding layer is R2, the outer radius value of the second inner cladding layer is R3, the outer radius value of the third inner cladding layer is R4, the outer radius value of the fourth inner cladding layer is R5, and the following relations are satisfied among the values, wherein R2/R1 is 2.2 to 3.00, R5/R1 is 4.0 to 5.2, R3-R2 is 1 to 3 mu m, and R5-R4 is 1 to 3 mu m.

The outer cladding layer is made of pure silicon dioxide material;

the mode field diameter of the optical fiber at 1310nm is 8.2-8.8 mu m, and the cabled cutoff wavelength is 1200-1260 nm;

the zero dispersion slope of the optical fiber is less than or equal to 0.092 ps/(nm)²Km), typical value ≦ 0.090 ps/(nm)²·km)；

The zero dispersion wavelength of the optical fiber is 1300-1324 nm, and the typical value is 1311 nm;

the macrobending performance of the optical fiber is as follows: the macrobend additional loss of 1550nm and 1625nm of a bending radius of 15mm wound by 10 turns is respectively less than 0.03dB/km and 0.1 dB/km; the macrobend additional loss of 1550nm and 1625nm of a bending radius of 10mm wound around 1 circle is respectively less than 0.03dB/km and 0.1 dB/km; the 7.5mm macrobend additional loss of 1550nm and 1625nm of the bending radius winding 1 circle is respectively less than 0.08dB/km and 0.25 dB/km; the macrobend additional losses at 1550nm and 1625nm for a 5mm bend radius around 1 turn are less than 0.15dB/km and 0.45dB/km, respectively.

A schematic of the refractive index profile of the cross section of a single mode fiber is shown in FIG. 1, and in particular, the values for Δ 1 are 0.34%, Δ 2 are-0.04%, Δ 3 are-0.41%, R1 is 3.4 μm, R2 is 8.2 μm, R3 is 10.4 μm, R4 is 15.0 μm, and R5 is 17 μm.

The main indexes of the optical fiber are shown in the following table:

the macrobending properties of the fiber are shown in the following table:

it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.