CN209765095U - Broadband double-core photonic crystal fiber polarization beam splitter - Google Patents
Broadband double-core photonic crystal fiber polarization beam splitter Download PDFInfo
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- CN209765095U CN209765095U CN201920824018.1U CN201920824018U CN209765095U CN 209765095 U CN209765095 U CN 209765095U CN 201920824018 U CN201920824018 U CN 201920824018U CN 209765095 U CN209765095 U CN 209765095U
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Abstract
A broadband double-core photonic crystal fiber polarization beam splitter is characterized in that a beam splitter main body is provided with air holes in regular triangular grid arrangement, the air holes form a fiber core of the beam splitter, and the background material of the beam splitter is pure quartz glass; the central air hole in the right center of the regular triangular grid arrangement air holes is filled with a graphene ring with a certain thickness, and the periphery of the central air hole is filled with the graphene ring; the fiber core A is arranged on the left side of the central air hole, the fiber core B is arranged on the right side of the central air hole, the fiber core A is doped with fluorine, the fiber core B is doped with germanium, and the doping concentration can be adjusted. The utility model provides a high light splitting ratio, ultra wide band, high birefringence photonic crystal optic fibre beam splitter will play important effect in aspects such as optic fibre device, optic fibre sensing and fiber transmission system.
Description
Technical Field
The utility model relates to a photonic crystal fiber field specifically is a two core photonic crystal fiber polarization beam splitters of broadband.
Background
The prominent characteristic of the photonic crystal fiber is gradually excavated along with the attention of people, the prominent characteristic of the photonic crystal is the urgent need of optical communication devices, the polarization beam splitter is an important one of the optical communication devices, and the effect of the photonic crystal fiber on the polarization beam splitter is reflected in front of people. The existing polarization beam splitter has the characteristics of long physical length, narrow bandwidth, low splitting ratio and the like, which hardly meets the requirements of the existing optical communication. And the photonic crystal fiber has the characteristics of flexible structure and novelty, so the photonic crystal fiber polarization beam splitter has the advantages that the traditional beam splitter does not have.
as early as 2003, Zhang et al proposed a high-birefringence two-core photonic crystal fiber, which realizes polarization beam splitting by changing the size of air holes of the photonic crystal fiber. Since then, the high birefringence characteristics of photonic crystal fibers have been followed by reports on polarization beam splitters. In 2005, Nikolaos Florous et al changed the shape of the air hole from circular to elliptical, breaking the symmetry of photonic crystal fibers, thereby achieving beam splitting at both 1310nm and 1550 nm. The introduction of the elliptical air holes opens a trigger for the research of the photonic crystal fiber polarization beam splitter, and more elliptical air holes are introduced into the photonic crystal fiber polarization beam splitter later. On the other hand, in addition to changing the shape of the air holes, researchers have studied various arrangements of the air holes, such as a regular quadrangle, a regular pentagon, a regular hexagon, a regular octagon, and the like, and various arrangements of photonic crystal fiber polarization beam splitters have been reported in succession.
Disclosure of Invention
The utility model aims at providing a two core high splitting ratio photonic crystal fiber polarization beam splitters of broadband has the graphite alkene ring of certain thickness in the central air hole of two core photonic crystal fiber, and the fibre core of central air hole both sides is doped with metal germanium and fluorine, realizes characteristics such as high splitting ratio and high bandwidth to can realize splitting ratio and coupling length etc. the tuning of polarization characteristic through changing doping concentration.
A broadband double-core photonic crystal fiber polarization beam splitter is characterized in that a beam splitter main body is provided with air holes in regular triangular grid arrangement, the air holes form a fiber core of the beam splitter, and the background material of the beam splitter is pure quartz glass;
The central air hole in the right center of the regular triangular grid arrangement air holes is filled with a graphene ring with a certain thickness, and the periphery of the central air hole is filled with the graphene ring;
The fiber core A is arranged on the left side of the central air hole, the fiber core B is arranged on the right side of the central air hole, the fiber core A is doped with fluorine, the fiber core B is doped with germanium, and the doping concentration can be adjusted.
Further, the diameter of the circular air holes arranged in a regular triangular grid is d 1, and d 1 is 1.65 um.
Further, the distance between the adjacent air holes is lambada, and the lambada is 3 um.
Further, the thickness of the graphene ring is d 2, and the thickness of d 2 is 7.6 nm.
further, the doping concentrations of fluorine and germanium of the fiber core A and the fiber core B can be adjusted to obtain different splitting ratios and coupling length ratios.
The utility model provides a high light splitting ratio, ultra wide band, high birefringence photonic crystal optic fibre beam splitter will play important effect in aspects such as optic fibre device, optic fibre sensing and fiber transmission system.
Drawings
Fig. 1 is a schematic structural diagram of the present invention, including a cross-sectional view and structural parameters of an optical fiber.
Fig. 2 is a graph showing the relationship between the spectral ratio and the wavelength when the concentration of the doped germanium is 0, 0.002, 0.004, 0.006.
Fig. 3 is a graph showing the relationship between the coupling length ratio and the wavelength variation when the germanium concentration is 0, 0.002, 0.004, 0.006.
fig. 4 is a graph showing the relationship between the variation of y-polarization coupling length with wavelength when the concentration of doped germanium is 0, 0.002, 0.004, and 0.006.
Fig. 5 is a graph showing the relationship between the change of x-polarization with wavelength when the concentration of doped germanium is 0, 0.002, 0.004, and 0.006.
Fig. 6 is a graph showing the relationship between the spectral ratio and the wavelength when the fluorine doping concentration is 0, 0.002, 0.004, 0.006.
Fig. 7 is a graph showing the relationship between the coupling length ratio and the wavelength when the fluorine doping concentration is 0, 0.002, 0.004, 0.006.
Fig. 8 is a graph showing the relationship between the change of the y-polarization coupling length with the wavelength when the fluorine doping concentration is 0, 0.002, 0.004, 0.006.
Fig. 9 is a graph showing the relationship between the change of x-polarization with wavelength when the fluorine doping concentration is 0, 0.002, 0.004, 0.006.
FIG. 10 is a schematic diagram of the energy distribution of X and Y polarized light incident on the core.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
a broadband double-core photonic crystal fiber polarization beam splitter is characterized in that a beam splitter main body is provided with air holes in regular triangular grid arrangement, the air holes form a fiber core of the beam splitter, and the background material of the beam splitter is pure quartz glass.
The graphene ring with a certain thickness is filled in the central air hole in the positive center of the regular triangular grid arrangement air holes, and the graphene ring is filled on the periphery of the central air hole.
the fiber core A is arranged on the left side of the central air hole, the fiber core B is arranged on the right side of the central air hole, the fiber core A is doped with fluorine, the fiber core B is doped with germanium, and the doping concentration can be adjusted.
The diameter of the circular air holes arranged in the regular triangular grids is d 1, and the diameter of d 1 is 1.65 um.
The adjacent air hole spacing is Λ, and 3um is got to Λ.
The thickness of the graphene ring is d 2, and the thickness of d 2 is 7.6 nm.
The doping concentrations of fluorine and germanium of the fiber core A and the fiber core B can be adjusted to obtain different splitting ratios and coupling length ratios.
The utility model discloses a change that the spectral ratio of design is along with the wavelength is shown in FIG. 2, can know from the figure that 285nm, 390nm, 420nm, 402nm when lambda =3um, d 1 =1.65um, d 2 =37.6nm, the germanium-doped concentration is 0, 0.002, 0.004, 0.006 respectively, the spectral ratio bandwidth between wavelength 0.9um-2um is 285nm, 390nm, 420nm, 402nm respectively, the minimum value of spectral ratio can reach-76.1 dB, the corresponding wavelength is 1.3 um.
The present invention relates to a coupling length ratio as shown in fig. 3, wherein the coupling length ratio varies with wavelength as shown in fig. 3, and it can be seen from the figure that when Λ =3um, d 1 =1.65um, d 2 =37.6nm, the germanium doping concentration is 0, 0.002, 0.004, 0.006, respectively, the coupling length ratio is close to 2 when the coupling length ratio is between 1.25um and 2um, and the germanium doping concentration is 0.004 is closest to 2, and then 0.006, 0.002, 0, indicating that the performance is best when the germanium doping concentration is 0.004.
As shown in fig. 4, it can be seen that the y polarization coupling length characteristic of the present invention has an important role in the fiber sensor device and the polarization beam splitter, it can be seen from the figure that when Λ =3um, d 1 =1.65um, d 2 =37.6nm, the germanium doping concentration is 0, 0.002, 0.004, 0.006 respectively, the y polarization coupling length is minimum at the germanium concentration of 0.004, and the y polarization coupling lengths of the three models with the doping concentrations of 0, 0.002, 0.006 between 1.25um-2um are substantially the same, all around 0.4 mm.
As shown in fig. 5, it can be seen that the x-polarization coupling length characteristic of the present invention has an important role in the fiber sensor device and the polarization beam splitter, it can be seen that when Λ =3um, d 1 =1.65um, d 2 =37.6nm, the germanium doping concentration is 0, 0.002, 0.004, 0.006, respectively, the x-polarization coupling length is substantially the same between 1.25um-2um, and there is a difference between 0.9-1.25 um.
As shown in fig. 6, it can be seen that the change of the splitting ratio with the wavelength of the present invention is shown in fig. 6, and it can be seen from the figure that when Λ =3um, d 1 =1.65um, d 2 =37.6nm, and the fluorine-doped concentrations are 0, 0.002, 0.004, and 0.006, the splitting ratio bandwidths between the wavelengths 0.9um and 2um are 410nm, 452nm, 420nm, and 422nm, respectively, the lowest points of the splitting ratio are-33.8 dB, -84.6dB, -41.2dB, -45.4dB, respectively, the lowest points of the concentrations are 0, 0.002, and 0.004 are 1.6um, and the lowest point of the concentration is 1.35um, respectively, which indicates that the lowest point of the trough ratio of the increase of the concentration can make the splitting ratio move, and the blue shift phenomenon occurs.
The present invention relates to a coupling length ratio as a function of wavelength as shown in fig. 7, which shows that when Λ =3um, d 1 =1.65um, d 2 =37.6nm and the fluorine doping concentration is 0, 0.002, 0.004, 0.006, respectively, the coupling length ratio is closest to 2 when the coupling length ratio is between 1.25um and 2um and the germanium doping concentration is 0.002 is closest to 2, and is next to 0.004, 0, 0.006.
As shown in fig. 8, it can be seen that the y polarization coupling length characteristic of the present invention has an important role in the fiber sensor device and the polarization beam splitter, as shown in fig. 8, when Λ =3um, d 1 =1.65um, d 2 =37.6nm, and the fluorine doping concentrations are 0, 0.002, 0.004, and 0.006, respectively, the y polarization coupling length gradually decreases with the increase of the wavelength and does not change when reaching 0.39mm, and the y polarization coupling lengths of the four models with the doping concentrations of 0, 0.002, 0.004, and 0.006 are substantially the same between 1.25um and 2 um.
As shown in fig. 9, it can be seen that the x-polarization coupling length characteristic of the present invention has an important role in the fiber sensor device and the polarization beam splitter, when Λ =3um, d 1 =1.65um, d 2 =37.6nm, and the fluorine doping concentrations are 0, 0.002, 0.004, and 0.006, respectively, the x-polarization coupling length is substantially the same between 1.25um and 2um at different fluorine doping concentrations, and there is a difference between 0.9 and 1.25um, and as the wavelength increases, the x-polarization coupling length gradually decreases and does not substantially change when reaching 0.19 mm.
Under the above fiber parameters, it is calculated that Lx =0.1934mm and Ly =0.3816mm, that is, the length of the beam splitter is 0.38mm, and it is obvious that when a light beam enters from a certain port, after propagating along the fiber for 0.38mm, the light beam exiting from the same port will be a linear polarization positive light, and the energy distribution diagram 10 of the light beams in the X and Y polarization states entering the fiber core is shown.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all equivalent modifications or changes made by those skilled in the art according to the present invention should be included in the protection scope of the claims.
Claims (5)
1. The utility model provides a broadband two-core photonic crystal fiber polarization beam splitter which characterized in that:
The beam splitter main body is provided with air holes in regular triangular grid arrangement, the air holes form a fiber core of the beam splitter, and the background material of the beam splitter adopts pure quartz glass;
The central air hole in the right center of the regular triangular grid arrangement air holes is filled with a graphene ring with a certain thickness, and the periphery of the central air hole is filled with the graphene ring;
The fiber core A is arranged on the left side of the central air hole, the fiber core B is arranged on the right side of the central air hole, the fiber core A is doped with fluorine, the fiber core B is doped with germanium, and the doping concentration can be adjusted.
2. The broadband dual-core photonic crystal fiber polarization beam splitter of claim 1, wherein the diameter of the circular air holes in the regular triangular grid arrangement is d 1, and d 1 is 1.65 um.
3. The broadband dual-core photonic crystal fiber polarization beam splitter of claim 1, wherein: the adjacent air hole spacing is Λ, and 3um is got to Λ.
4. The broadband dual-core photonic crystal fiber polarization beam splitter of claim 1, wherein the graphene ring has a thickness d 2, and d 2 is 7.6 nm.
5. The broadband dual-core photonic crystal fiber polarization beam splitter of claim 1, wherein: the doping concentrations of fluorine and germanium of the fiber core A and the fiber core B can be adjusted to obtain different splitting ratios and coupling length ratios.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110068888A (en) * | 2019-06-03 | 2019-07-30 | 南京邮电大学 | A kind of broadband double-core photonic crystal fiber polarization beam apparatus |
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