CN212623178U - Novel high-birefringence photonic crystal fiber - Google Patents
Novel high-birefringence photonic crystal fiber Download PDFInfo
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- CN212623178U CN212623178U CN202021613578.1U CN202021613578U CN212623178U CN 212623178 U CN212623178 U CN 212623178U CN 202021613578 U CN202021613578 U CN 202021613578U CN 212623178 U CN212623178 U CN 212623178U
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- 239000000835 fiber Substances 0.000 title claims abstract description 53
- 239000004038 photonic crystal Substances 0.000 title claims abstract description 37
- 238000005253 cladding Methods 0.000 claims abstract description 20
- 239000013307 optical fiber Substances 0.000 abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 6
- 230000010287 polarization Effects 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000008054 signal transmission Effects 0.000 abstract description 3
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 description 23
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
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Abstract
The invention discloses a novel high-birefringence photonic crystal fiber, and belongs to the field of photonic crystal fiber communication. The optical fiber comprises a cladding and a fiber core, wherein the substrate material is silicon dioxide, and the optical fiber is characterized in that: the left side and the right side of a fiber core of the photonic crystal fiber are respectively provided with 5 layers of air holes, the innermost layer of the cladding air holes is formed by arranging elliptical air holes according to a hexagon, the long axis of each elliptical air hole is vertical to an x axis, the second layer of the cladding air holes is formed by arranging circular air holes according to a hexagon, the parts of the second layer of air holes, which are positioned on the left side of a y axis, are sequentially translated leftwards for the same distance to obtain the 3 rd to 5 th layers of air holes on the left side of the y axis of the cladding, the parts of the second layer of air holes, which are positioned on the right side of the y axis, are sequentially translated rightwards for the same distance to obtain the 3 rd to 5. The novel high birefringence photonic crystal fiber can reduce the coupling in two polarization directions in the signal transmission process, improve the transmission distance of optical signals, and is suitable for the fields of long-distance optical fiber communication, optical fiber sensing and the like.
Description
Technical Field
The invention relates to the technical field of optical fibers, in particular to a novel high-birefringence photonic crystal fiber.
Background
The photonic crystal fiber is a novel microstructure fiber developed based on photonic crystal and fiber technology, and consists of a fiber core and air holes periodically arranged around the fiber core. Because the photonic crystal fiber has flexible parameter adjustability in structure, compared with the traditional fiber, the photonic crystal fiber has the characteristics of non-cutoff single-mode transmission, high birefringence, low loss, dispersion management and the like, and has wide application in the fields of optical fiber sensing, optical communication, medical instruments and the like. The distributed optical fiber sensing technology can be used as a fault diagnosis and accident early warning means in the fields of energy, electric power, buildings, communication, traffic and the like, and an optical fiber sensing system generally adopts a polarization-maintaining optical fiber with high birefringence as a sensing optical fiber so as to reduce the influence of polarization mode coupling in the optical fiber on the signal-to-noise ratio of the sensing system. Zero dispersion optical fiber also has unique advantages for long distance, high capacity optical signal transmission. Therefore, it is very necessary to design a new photonic crystal fiber having high birefringence.
Although some of the properties of existing photonic crystal fibers can be achieved, it is not possible to achieve better birefringence and dispersion at the same time. Saha r. (Saha R, Hossain M, raman M E, et al, frontiers of Optoelectronics, 2019, 12 (2): 165--2However, the dispersion is large and needs to be optimized. Liaku et al (Liaku, Liaku Jianfei, Libogah, Wang bin, Schaub.) a high birefringence double zero dispersion defective photonic crystal fiber [ J]Quantum electronics, 2019, 36 (01): 123-128) has 2 zero dispersion points in the visible light band and the infrared light band, and the birefringence value is only 3.327 × 10-2It is to be improved. It can be seen that there is a need for new fiber designs with high birefringence and multiple zero dispersion wavelengths.
Disclosure of Invention
The invention aims to provide a photonic crystal fiber with high birefringence and multiple zero dispersion wavelengths, which aims to solve the problems of the photonic crystal fiber in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a photonic crystal fiber with high birefringence, multiple zero dispersion wavelengths, the cross-section of said fiber comprising a cladding and a core. The method is characterized in that: the left side and the right side of a fiber core of the photonic crystal fiber are respectively provided with 5 layers of air holes, the innermost layer of the cladding air holes is formed by arranging elliptical air holes according to a hexagon, the long axis of each elliptical air hole is vertical to an x axis, the second layer of the cladding air holes is formed by arranging circular air holes according to a hexagon, the parts of the second layer of air holes, which are positioned on the left side of a y axis, are sequentially translated leftwards for the same distance to obtain the 3 rd to 5 th layers of air holes on the left side of the y axis of the cladding, the parts of the second layer of air holes, which are positioned on the right side of the y axis, are sequentially translated rightwards for the same distance to obtain the 3 rd to 5.
Further, the substrate material of the optical fiber is silicon dioxide.
Compared with the prior art, the invention designs a novel high-birefringence photonic crystal fiber, which has the advantages and beneficial effects that:
high birefringence is achieved, 4.477 × 10 is obtained at a wavelength of 1550nm-2The high birefringence coefficient is improved by 1-2 orders of magnitude compared with the existing optical fiber, and is beneficial to the accurate measurement in optical fiber sensing.
The multi-zero dispersion wavelength is realized, the dispersion at the wavelengths of 1278nm, 1566nm and 1645nm is 0 ps/(nm.km), the dispersion at 1550nm is only-60 ps/(nm.km), and the accurate and stable transmission of signals is facilitated.
The novel photonic crystal fiber has a simple structure and is easy to integrate and process.
Drawings
FIG. 1 is a schematic cross-sectional view of a novel photonic crystal fiber structure in an embodiment. In the figure: 1-a base material; 2-circular air holes in the cladding; 3-elliptical air holes in the cladding; r is1-the radius of the circular air hole; a is1Major axis of the oval air hole, b1-the minor axis of the elliptical air hole; d0-hole spacing of adjacent air holes; d1-fiber cladding diameter.
FIG. 2 shows the radius r of the novel photonic crystal fiber in a circular air hole in an embodiment1Variation of birefringence with wavelength, taken at different valuesAnd (5) a relational graph.
FIG. 3 shows the radius r of the novel photonic crystal fiber in a circular air hole in an embodiment1Taking a graph of the variation of chromatic dispersion with wavelength at different values, wherein:
FIG. 3a shows the x-polarization dispersion and FIG. 3b shows the y-polarization dispersion.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Fig. 1 is a schematic cross-sectional view of a novel high birefringence photonic crystal fiber according to the present invention, wherein the substrate material 1 is silica. The air holes of the cladding are distributed in axial symmetry, 5 air holes are respectively arranged on the left side and the right side of the fiber core, and the innermost layer of the air holes of the cladding is a from the long axis1Minor axis b1The elliptical air holes are arranged in a hexagon, the long axes of the elliptical air holes are vertical to the x axis, the second layer is formed by arranging circular air holes with the radius of r in a hexagon, and the parts of the second layer of air holes positioned on the left side of the y axis are sequentially translated leftwards d0Obtaining the 3 rd to 5 th layers of air holes on the left side of the y axis of the cladding, and sequentially translating the parts, positioned on the right side of the y axis, of the second layer of air holes to the right by d0Obtaining the 3 rd to 5 th layers of air holes on the right side of the y axis of the cladding, and the diameter of the optical fiber is d1。
In this embodiment, the structural parameters of the photonic crystal fiber are as follows: radius r of circular air hole1Respectively taking the major axis a of the elliptical air hole as 0.35 μm, 0.38 μm and 0.4 μm1And a minor axis b10.8 μm and 0.4 μm, respectively, and the hole pitch d of the air holes00.85 μm, fiber cladding diameter d1＝9.4μm。
The invention can adopt a finite element method and combine the boundary absorption condition of the perfect matching layer to carry out theoretical calculation to obtain the birefringence characteristic and the dispersion characteristic of the invention.
Radius r of the circular air hole in the present embodiment1The birefringence characteristics of the photonic crystal fiber obtained when 0.35 μm, 0.38 μm and 0.4 μm were taken as shown in FIG. 2, and when observing FIG. 2, it was found that:
the birefringence of the novel high-birefringence photonic crystal fiber is along with r1At 1550nm, when r is1When the grain size is 0.4 mu m, 4.477X 10 can be obtained-2Birefringence of (c). Whereas the birefringence of a conventional optical fiber is generally 10-4In order of magnitude, the birefringence of the existing photonic crystal fiber is generally 10-3The order of magnitude is 1-2 orders of magnitude higher than that of the existing photonic crystal fiber, coupling of transmission signals in two polarization directions is reduced, and the photonic crystal fiber has an important effect in the fields of high-speed optical communication systems, fiber sensing and the like.
Radius r of the circular air hole in the present embodiment1The dispersion characteristics in the x and y polarization directions of the photonic crystal fiber obtained when 0.35 μm, 0.38 μm, and 0.4 μm were taken as shown in FIG. 3a and FIG. 3b, respectively, and when observing FIG. 3, it was found that:
the novel high-birefringence photonic crystal fiber has three zero dispersion wavelengths in the x polarization direction, namely 1278nm, 1566nm and 1645nm, the dispersion value at 1550nm is only-60 ps/(nm.km), and the small dispersion is favorable for the generation of a supercontinuum and the accurate and stable transmission of optical signals; the y polarization directions are negative dispersion values, and the positive dispersion in a required communication system can be counteracted by adjusting structural parameters or wavelengths, so that the function of dispersion compensation is realized.
The above description is only one embodiment of the present invention, and not all or only one embodiment, and any equivalent alterations to the technical solutions of the present invention, which are made by those skilled in the art through reading the present specification, are covered by the claims of the present invention.
Claims (3)
1. A novel high birefringence photonic crystal fiber, the cross section of the fiber comprises a cladding and a fiber core, and the novel high birefringence photonic crystal fiber is characterized in that: the left and right sides of the fiber core of the photonic crystal fiber are respectively provided with 5 layers of air holes, and the innermost layer of the cladding air holes has a long axis1Minor axis b1The second layer is formed by arranging the oval air holes in a hexagon shape, and the diameter of the second layer is 2r1The circular air holes are arranged in a hexagon, and the parts of the second layer of air holes positioned on the left side of the y axis are arranged in sequenceLeft-hand translation by the same distance d0Obtaining the 3 rd to 5 th layers of air holes on the left side of the y axis of the cladding, and sequentially translating the parts, positioned on the right side of the y axis, of the second layer of air holes to the right by the same distance d0And obtaining the 3 rd to 5 th layers of air holes on the right side of the cladding y axis, wherein the whole structure is in axial symmetry distribution.
2. A novel high birefringence photonic crystal fiber as defined in claim 1, wherein: the long axis of the elliptical air hole is perpendicular to the x-axis.
3. A novel high birefringence photonic crystal fiber as defined in claim 1, wherein: the diameter of the circular air hole is equal to the length of the long axis of the elliptical air hole, the hole spacing of the adjacent air holes is equal, and the length of the long axis of the elliptical air hole is twice of the length of the short axis.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117991441A (en) * | 2024-04-03 | 2024-05-07 | 武汉墨光科技有限公司 | High-birefringence photonic crystal fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117991441A (en) * | 2024-04-03 | 2024-05-07 | 武汉墨光科技有限公司 | High-birefringence photonic crystal fiber |
| CN117991441B (en) * | 2024-04-03 | 2024-05-31 | 武汉墨光科技有限公司 | High-birefringence photonic crystal fiber |
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