CN117631138A - Large effective area optical fiber for high-speed optical communication application - Google Patents
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- CN117631138A CN117631138A CN202311742571.8A CN202311742571A CN117631138A CN 117631138 A CN117631138 A CN 117631138A CN 202311742571 A CN202311742571 A CN 202311742571A CN 117631138 A CN117631138 A CN 117631138A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 64
- 230000003287 optical effect Effects 0.000 title claims abstract description 23
- 238000004891 communication Methods 0.000 title claims abstract description 21
- 239000010410 layer Substances 0.000 claims abstract description 82
- 238000005253 cladding Methods 0.000 claims abstract description 77
- 239000000835 fiber Substances 0.000 claims abstract description 34
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 21
- 230000007704 transition Effects 0.000 claims abstract description 15
- 239000012792 core layer Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 238000005452 bending Methods 0.000 abstract description 13
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- -1 boron ions Chemical class 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000035515 penetration Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Abstract
The invention provides a large effective area optical fiber for high-speed optical communication application, which comprises a fiber core layer and a cladding layer, wherein the fiber core layer sequentially comprises a trapezoid structure with a sunken center, a high refractive index layer and a transition layer from the center of the fiber core to the outside, and the cladding layer sequentially comprises an inner cladding layer, a sunken inner cladding layer and an outer cladding layer from the inside to the outside; the refractive index relation of each layer satisfies: n is n 1 ＜n 2 ，n 2 ＞n 3 ＞n 4 ＝n 6 ＞n 5 Wherein n is 1 、n 2 、n 3 、n 4 、n 5 、n 6 The refractive index of the central refractive index of the trapezoid structure, the refractive index of the high refractive index layer, the refractive index of the transition layer, the refractive index of the inner cladding layer, the refractive index of the depressed inner cladding layer and the refractive index of the outer cladding layer are respectively. The invention has lower coupling loss and better bending property.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to a large effective area optical fiber for high-speed optical communication application.
Background
With the rapid development of communication networks, the demand for higher rates and longer transmission distances is also increasing. Conventional single mode optical fibers g.652 typically have a small effective area, which limits their performance in high speed optical communication applications. To meet this demand, many fiber designs with large effective areas have been proposed. Of these, fiber g.654.e is widely recognized as a potential candidate with a larger effective area that can provide better fiber performance.
To meet the optical fiber communication requirement, the related performance is optimized. From the perspective of the optical fiber, on one hand, the attenuation of the optical fiber needs to be reduced, the optical signal to noise ratio of optical fiber transmission is improved, and on the other hand, the effective area of the optical fiber is improved, and the nonlinear effect of the optical fiber is reduced. The CN107132614A patent proposes a large effective area optical fiber, which adopts a step-type sunken structure, and has the defects that a core layer is tightly connected with a sunken layer, and the refractive index difference is large, so that the cut-off wavelength is higher; the optical power tends to leak to the depressed layer so that the attenuation increases.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the large effective area optical fiber for high-speed optical communication application, and the single-mode optical fiber has lower coupling loss and better bending property.
The present invention achieves the above technical object by the following means.
The large effective area optical fiber for high-speed optical communication application comprises a fiber core layer and a cladding layer, wherein the fiber core layer sequentially comprises a trapezoid structure with a sunken center, a high refractive index layer and a transition layer from the center of the fiber core to the outside, and the cladding layer sequentially comprises an inner cladding layer, a sunken inner cladding layer and an outer cladding layer from the inside to the outside;
the refractive index relation of each layer satisfies: n is n 1 ＜n 2 ，n 2 ＞n 3 ＞n 4 ＝n 6 ＞n 5 Wherein n is 1 、n 2 、n 3 、n 4 、n 5 、n 6 The refractive index of the central refractive index of the trapezoid structure, the refractive index of the high refractive index layer, the refractive index of the transition layer, the refractive index of the inner cladding layer, the refractive index of the depressed inner cladding layer and the refractive index of the outer cladding layer are respectively.
Further, the trapezoid structure consists of 3-6 uniform medium layers, and the refractive index of the trapezoid structure is sequentially increased from the center of the fiber core to the outside.
Further, the width of the trapezoid structure is 2-3.5 mum, the relative refractive index delta n of the center of the fiber core of the trapezoid structure 1 0 to 0.2%, the width of the high refractive index layer is 1.5 to 2.5 mu m, and the relative refractive index of the high refractive index layer is delta n 2 0.30 to 0.40 percent, the width of the transition layer is 2 to 3 mu m, and the relative refractive index delta n of the transition layer 3 0.06 to 0.09%, wherein the relative refractive index isIn n i Is the absolute refractive index of the specific position of the optical fiber, and n c Is the refractive index of pure silica.
Further, the width of the inner cladding is 4-7 μm, and the refractive index of the inner cladding is the same as that of the outer cladding.
Further, the width of the depressed inner cladding is 4-8 μm, and the relative refractive index delta n of the depressed inner cladding 5 And the outer cladding is a silica glass layer of which the thickness is-0.1 to-0.24 percent.
Further, the effective area of the optical fiber at the wavelength of 1500nm is 120-130 mu m 2 。
Further, the mode field diameter at 1550nm is 11.5-12.5 μm.
Further, the attenuation coefficient at 1550nm is less than or equal to 0.23dB/km.
Further, a cutoff wavelength of the optical cable composed of the optical fibers is less than or equal to 1530nm.
Further, at a wavelength of 1625nm, the macrobend loss of the optical fiber at a bend radius of 30mm at 100 turns is equal to or less than 0.1dB.
The invention has the beneficial effects that:
(1) The optical fiber of the invention not only realizes 1550nm wave band A eff Greater than 120 μm 2 Is also capable of reducing GeO in the fiber core 2 The viscosity coefficient of the core-cladding interface layer is optimized, thereby greatly reducing the optical loss of the optical fiber. Meanwhile, by introducing the trapezoid refractive index concave structure at the periphery of the fiber core layer, not only is the effective regulation and control on the mode field distribution of the fundamental mode realized, but also the bending resistance of the optical fiber is greatly improved.
(2) The optical fiber of the invention not only utilizes the advantages of low bending loss and low connection loss of the single-mode optical fiber, but also has no special requirements on optical fiber connection and good compatibility.
(3) The optical fiber structure of the invention is circularly symmetrical, can be realized by adopting the existing mature optical fiber manufacturing process, and the outer cladding and the inner cladding adopt pure silica design, thereby reducing the proportion of doping other substances, and having lower manufacturing cost and higher efficiency.
Drawings
FIG. 1 is a graph of radial refractive index profile of an optical fiber according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional profile of an optical fiber according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of parameters of an optical fiber structure according to an embodiment of the present invention;
FIG. 4 is a graph of bending loss of an optical fiber according to an embodiment of the present invention, wherein: (a) Bend loss at 15mm bend radius schematic (b) bend loss at 30mm bend radius schematic;
FIG. 5 is a graph showing the dispersion characteristics of an optical fiber according to an embodiment of the present invention;
FIG. 6 is a schematic view of the effective area and mode field diameter of an optical fiber according to an embodiment of the present invention;
wherein, the 1-trapezoid structure, the 1-1 depressed fiber core 1, the 1-2 depressed fiber core 2, the 1-2 depressed fiber core 3, 2-high refractive index layer, the 3-transition layer, the 4-inner cladding layer, the 5-depressed inner cladding layer and the 6-outer cladding layer.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
Referring to fig. 1 to 6, a large effective area optical fiber for high-speed optical communication applications according to an embodiment of the present invention includes a core layer and a cladding layer.
Specifically, the fiber core layer sequentially comprises a trapezoid structure 1 with a sunken center, a high refractive index layer 2 and a transition layer 3 from the center of the fiber core to the outside, and the cladding sequentially comprises an inner cladding 4, a sunken inner cladding 5 and an outer cladding 6 from the inside to the outside.
The refractive index relation of each layer satisfies: n is n 1 ＜n 2 ，n 2 ＞n 3 ＞n 4 ＝n 6 ＞n 5 Wherein n is 1 、n 2 、n 3 、n 4 、n 5 、n 6 The refractive index of the trapezoid 1, the refractive index of the high refractive index layer 2, the refractive index of the transition layer 3, the refractive index of the inner cladding layer 4, the refractive index of the depressed inner cladding layer 5 and the refractive index of the outer cladding layer 6 are respectively.
Furthermore, the trapezoid structure 1 consists of 3-6 uniform dielectric layers, and the electric field energy of the optical fiber is distributed in a non-Gaussian mode in the fiber core as a result of the center sinking, and the electric field energy is diffused to two sides along the fiber core, so that the effective area of the optical fiber is increased. The refractive index of the trapezoid structure 1 sequentially increases from the center of the fiber core to the outside. The doping concentration of the fiber core is reduced, and the section of the optical fiber is optimized, namely, the fiber core layer of the sunken trapezoid structure 1 is adopted, so that the scattering and absorption of light caused by doping other impurities besides the absorptivity of SiO2 can be reduced. The lower the concentration of the doping material, the closer the distribution of the core refractive index is to pure quartz, and the smaller the loss due to Rayleigh scattering.
The width of the fiber core structure is 7-8 mu m, and the effective area of the optical fiber is improved by adopting a larger fiber core diameter. The width of the trapezoid structure 1 is 2-3.5 mu m, and the relative refractive index delta n of the center of the fiber core of the trapezoid structure 1 1 0 to 0.2%, the width of the high refractive index layer 2 is 1.5 to 2.5 μm, and the relative refractive index of the high refractive index layer 2 is Deltan 2 0.30 to 0.40%, the width of the transition layer 3 is 2 to 3 mu m, and the relative refractive index delta n of the transition layer 3 3 0.06 to 0.09%, wherein the relative refractive index isIn n i Is the absolute refractive index of the specific position of the optical fiber, and n c Is the refractive index of pure silica. The proportion of each uniform medium layer of the trapezoid structure 1 is controlled, so that the cut-off wavelength can be shortened, the attenuation of the optical fiber can be reduced, the mode field diameter can be increased, the dispersion of 1550nm can be reduced, the zero dispersion wavelength can be increased, and the zero dispersion slope can be improved. The proper thickness and refractive index of the fiber core layer can lead the MFD to be better, and the dispersion and the cutoff wavelength lambdac to reach a proper range.
Further, the width of the inner cladding 4 is 4-7 μm, and the refractive index of the inner cladding 4 is the same as the refractive index of the outer cladding 6. In order to control the cut-off wavelength while ensuring bending properties at large curvatures, the distance between the depressed inner cladding 5 and the core edge is usually less than 7 μm, and the width of the inner cladding 4 of the present invention is 4 to 7 μm.
Further, the width of the depressed inner cladding 5 is 4-8 μm, and impurity fluorine or boron ions are doped in the silicon dioxide of the depressed inner cladding 5, so that the refractive index of the depressed inner cladding 5 is lower relative to the refractive indexes of the inner cladding 4 and the outer cladding 6, the refractive index of the whole cladding is reduced, and the refractive index difference between the cladding and the fiber core layer is increased, thereby improving the bending resistance of the optical fiber. Due to the limitation of the process, the penetration phenomenon is easy to occur at the interface of the depressed inner cladding 5, the inner cladding 4 and the outer cladding 6, so that the doping concentration of the depressed inner cladding 5 cannot be too high, and the relative refractive index delta n of the depressed inner cladding 5 5 The width of the sinking inner cladding is-0.1 to-0.24 percent, the width of the sinking inner cladding is not too wide, the width of the sinking inner cladding 5 is 4-8 mu m, and the sinking inner cladding 5 can improve the restraint capability of light in the fiber core layer and increase lambada c, so that the effect of relieving the light power leakage is achieved to a certain extent. Meanwhile, the cladding structure is sunk, the refractive index profile is adjusted by changing the depth, width and position of the sunk, so that a high-order mode leaks out of the cladding, the high-order mode is restrained, and single-mode operation is realized. The outer cladding 6 is a silica glass layer.
Further, the effective area of the optical fiber at the wavelength of 1500nm is 120-130 mu m 2
Further, the mode field diameter at 1550nm is 11.5-12.5 μm.
Further, the attenuation coefficient at 1550nm is less than or equal to 0.23dB/km.
Further, a cutoff wavelength of the optical cable composed of the optical fibers is less than or equal to 1530nm.
Further, at a wavelength of 1625nm, the macrobend loss of the optical fiber at a bend radius of 30mm at 100 turns is equal to or less than 0.1dB.
FIG. 4a shows bending loss at 15mm bending radius in one embodiment, macrobending loss at 1550nm operating wavelength of 2205dB/km, microbending loss of 0.017dB/km. The embodiment is smaller in bending loss, basically accords with the technical standard of G.654.E, and the optical fiber has smaller bending loss, so that the transmission performance is better when Liu Depu is set and used. As shown in FIG. 4b, when the bending radius is 30mm, the macrobending loss at 1550 working wavelength is 0.102dB/km, and the microbending loss is 0.0025dB/km, which basically accords with the technical standard of G.654. E. The total dispersion consists of waveguide dispersion, material dispersion, refractive index profile dispersion and polarization mode dispersion. The first three terms belong to wavelength dispersion, and the last term is modal dispersion. As shown in FIG. 5, the optical fiber has a zero dispersion wavelength of 1.2923 μm and a zero dispersion slope of 0.1002ps/nm 2 * km. The implementation dispersion is small, and basically accords with the technical standard of G.654. E. As shown in FIG. 6, the mode field area at a wavelength of 1550 μm is 122. Mu.m 2 The mode field diameter was 12.4. Mu.m.
The refractive index profile parameters listed in table 1 are those of the preferred embodiments of the present invention, specifically, the depressed trapezoid structure 1, the high refractive index layer 2 and the transition layer 3, which are the refractive index and the radius of the inner cladding layer 4, the depressed inner cladding layer 5 and the outer cladding layer 6, in this order from the inside to the outside, are shown below for each embodiment. Table 2 corresponds to the transmission characteristics of the optical fiber. Effective area at 1550nm, mode field diameter, attenuation at 1550nm, dispersion at 1550nm, 10x 15mm diameter bend loss at 1625nm, 100x 30mm diameter bend loss at 1625 nm. The embodiment of the invention has smaller bending loss, smaller dispersion, larger effective area and mode field diameter, satisfies low loss and large effective area, can effectively reduce the nonlinear effect of large-capacity optical fiber transmission, allows larger fiber entering power and improves transmission distance and transmission speed.
TABLE 1 refractive index profile parameters in embodiments of the invention
TABLE 2 optical fiber parameters for various embodiments of the invention
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The large effective area optical fiber for high-speed optical communication application comprises a fiber core layer and a cladding layer, and is characterized in that the fiber core layer sequentially comprises a trapezoid structure (1) with a sunken center, a high refractive index layer (2) and a transition layer (3) from the center of the fiber core to the outside, and the cladding layer sequentially comprises an inner cladding layer (4), a sunken inner cladding layer (5) and an outer cladding layer (6) from the inside to the outside;
the refractive index relation of each layer satisfies: n is n 1 ＜n 2 ，n 2 ＞n 3 ＞n 4 ＝n 6 ＞n 5 Wherein n is 1 、n 2 、n 3 、n 4 、n 5 、n 6 The refractive index of the trapezoid structure (1), the refractive index of the high refractive index layer (2), the refractive index of the transition layer (3), the refractive index of the inner cladding layer (4), the refractive index of the depressed inner cladding layer (5) and the refractive index of the outer cladding layer (6) are respectively shown.
2. The large effective area optical fiber for high speed optical communication applications according to claim 1, wherein the trapezoid structure (1) structure is composed of 3-6 layers of uniform dielectric layers, and the refractive index of the trapezoid structure (1) increases from the center of the fiber core to the outside sequentially.
3. The large effective area optical fiber for high speed optical communication applications according to claim 1, characterized in that the width of the trapezoid (1) is 2-3.5 μm, the core center relative refractive index Δn of the trapezoid (1) 1 0 to 0.2%, the width of the high refractive index layer (2) is 1.5 to 2.5 mu m, and the relative refractive index of the high refractive index layer (2) is delta n 2 0.30 to 0.40%, the width of the transition layer (3) is 2 to 3 mu m, and the relative refractive index delta n of the transition layer (3) 3 0.06 to 0.09%, wherein the relative refractive index isIn n i Is the absolute refractive index of the specific position of the optical fiber, and n c Is the refractive index of pure silica.
4. The large effective area optical fiber for high speed optical communication applications according to claim 1, characterized in that the width of the inner cladding (4) is 4-7 μm, the refractive index of the inner cladding (4) being the same as the refractive index of the outer cladding (6).
5. The large effective area optical fiber for high speed optical communication applications according to claim 1, wherein the width of the depressed inner cladding (5) is 4-8 μm, the relative refractive index Δn of the depressed inner cladding (5) 5 Is-0.1 to-0.24 percent, and the outer cladding layer (6) is a silica glass layer.
6. The high-speed optical communication application-oriented large effective area optical fiber according to claim 1, characterized in that the effective area of the optical fiber at 1500nm wavelength is 120-130 μm 2 。
7. The large effective area optical fiber for high speed optical communication applications according to claim 1, wherein the mode field diameter at 1550nm is 11.5-12.5 μm.
8. The large effective area optical fiber for high speed optical communication applications of claim 1, wherein the attenuation coefficient at 1550nm is less than or equal to 0.23dB/km.
9. The large effective area optical fiber for high speed optical communication applications according to claim 1, wherein the cable cutoff wavelength comprised of the optical fiber is less than or equal to 1530nm.
10. The large effective area optical fiber for high speed optical communication applications of claim 1, wherein the macrobend loss of the optical fiber at a bend radius of 30mm at 100 turns is equal to or less than 0.1dB at a wavelength of 1625 nm.
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| CN202311742571.8A CN117631138A (en) | 2023-12-18 | 2023-12-18 | Large effective area optical fiber for high-speed optical communication application |
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