CN111948751B - Design method of optical fiber current transformer optical fiber sensing ring based on 650nm wave band - Google Patents
Design method of optical fiber current transformer optical fiber sensing ring based on 650nm wave band Download PDFInfo
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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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02323—Core having lower refractive index than cladding, e.g. photonic band gap guiding
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/247—Details of the circuitry or construction of devices covered by G01R15/241 - G01R15/246
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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Abstract
The invention relates to a design method of an optical fiber sensing ring of an optical fiber current transformer based on a 650nm wave band. The invention belongs to the technical field of all-fiber current sensing design, and the method is characterized in that a cross-sectional structure of an optical fiber is provided with a plurality of layers of air holes; determining the chiral parameters of the optical fiber according to the concentration of griseofulvin in PMMA in the refractive index guiding type chiral photonic crystal optical fiber; determining the value range of the air filling ratio of the optical fiber, and taking the value meeting the requirement as the final air filling ratio of the optical fiber; and determining the value range of the lattice constant of the optical fiber according to the obtained chiral parameter and the air filling ratio of the optical fiber, and taking the value meeting the requirement as the final lattice constant of the optical fiber. The specific difference of the optical fiber current transformer system adopting the scheme of the photonic crystal optical fiber sensing ring is 0.235%, the reasonability of the designed chiral photonic crystal optical fiber parameter design is proved, and the improvement degree of the current measurement accuracy of the optical fiber current transformer system is shown.
Description
Technical Field
The invention relates to the technical field of all-fiber current sensing design, in particular to a design method of a fiber sensing ring of a fiber current transformer based on a 650nm wave band.
Background
The optical fiber current transformer is an optical fiber sensor based on Faraday optical rotation effect, and has the advantages of good insulativity, high reliability, wide frequency domain, good transient characteristics and the like, so that the optical fiber current transformer is widely applied to the power transmission industry and the electrolytic aluminum industry, and the industries all put forward high-precision requirements on the current measurement of the optical fiber current transformer. The main limiting factor in system accuracy is due to the non-ideality of the system's fiber optic sensing loop. Polarized light is transmitted in an ideal optical fiber sensing ring in the form of circularly polarized light, but residual linear birefringence exists in an optical fiber due to the fact that the manufacturing process of the optical fiber is not ideal, so that a polarization plane of the polarized light rotates, an error signal which cannot be distinguished from a Faraday effect is generated, polarization errors are generated in the transmission process of the light in a system, and the accuracy of the current measurement of the system is further reduced.
Therefore, in order to improve the accuracy of the system for measuring the current, it is necessary to consider increasing the circular birefringence of the fiber sensing ring or decreasing the residual linear birefringence thereof. The current mainstream scheme is to adopt a rotary panda type silicon-based polarization maintaining fiber as an optical fiber sensing ring of the system. The fiber is characterized in that two stress wires of a panda type silicon-based linear polarization maintaining fiber are stretched around a fiber core in a molten state and rotate at a constant speed, and the effective circular birefringence caused by the off-axis rotating stress wires is enhanced due to an average effect. However, there are problems with such fibers today. First, the fiber stress wire is not uniform in rotation rate, which means that its pitch is also not uniform, which results in residual linear birefringence in the fiber. Secondly, the fiber is subjected to extreme stresses during drawing, which over time cause the photoelastic characteristics of the core to change, which gradually diminishes its linear birefringence suppression. These problems in the optical fiber limit further improvement of the system accuracy. Therefore, a new type of high-degree circularly-maintaining polarizing fiber is needed to improve the accuracy of current measurement of the fiber-optic current transformer system.
Disclosure of Invention
The invention provides a design method of an optical fiber current transformer optical fiber sensing ring based on 650nm wave band, aiming at reducing polarization error introduced by residual linear birefringence of the optical fiber sensing ring in an optical fiber current transformer system and further improving the current measurement accuracy of the optical fiber current transformer system, and the invention provides the following technical scheme:
a design method of an optical fiber sensing ring of an optical fiber current transformer based on 650nm wave band comprises the following steps:
step 1: adopting a refractive index guiding type chiral photonic crystal fiber, wherein the cross-section structure of the fiber is provided with a plurality of layers of air holes;
step 2: determining the chiral parameters of the optical fiber according to the concentration of griseofulvin in PMMA in the refractive index guiding type chiral photonic crystal optical fiber;
and step 3: determining the value range of the air filling ratio of the optical fiber according to the obtained chiral parameters of the optical fiber and the determined lattice constant, and taking a value as the final air filling ratio of the optical fiber;
and 4, step 4: and determining the value range of the lattice constant of the optical fiber according to the obtained chiral parameter and the air filling ratio of the optical fiber, and taking any value as the final lattice constant of the optical fiber.
Preferably, the step 1 specifically comprises:
the cross section structure of the optical fiber is provided with 5 layers of air holes, each layer of air holes on the cross section of the optical fiber are arranged in a regular hexagon, the innermost layer of air holes in the center of the optical fiber is the 1 st layer of air holes, the outermost layer of air holes in the center of the optical fiber is the 5 th layer of air holes, and the number of the layers from the innermost layer to the outermost layer is increased layer by layer;
for the 1 st layer of air holes, the distance from all the 6 air holes to the center of the optical fiber is Λ, the distances of the air holes on the cross section of the whole optical fiber are equal, the distance is Λ, all the air holes are round holes, the diameters of the air holes are equal, the ratio of the diameter of each air hole of the optical fiber to the lattice constant of the air hole of the optical fiber is d/Λ, and the air filling ratio of the optical fiber is defined.
Preferably, the step 2 specifically comprises:
when griseofulvin is in PMMAAt a concentration of 0.067g/cm, the corresponding optical rotation rate delta 0 Expressed by Boltzmann's formula, the corresponding optical rotation rate delta is expressed by the following formula 0 ：
Wherein, B 1 And B 2 Are all constants, B 1 ＝1.46×10 4° ·nm 2 /mm，B 2 ＝1.82×10 10° ·nm 4 /mm；
According to the optical rotation rate delta 0 Determining a chiral parameter, determining a chiral parameter xi by 0 ：
k 0 ＝2π/λ
Wherein k is 0 Is the light wave vector, and λ is the wavelength of light from the light source.
Preferably, the step 3 specifically comprises:
under the determined chiral parameters and the distance from the air hole to the center of the optical fiber, the effective refractive indexes of a guiding mode and a space filling mode of the chiral photonic crystal optical fiber under different air filling ratios are calculated through a two-dimensional chiral plane wave expansion method, when the effective refractive index of a basic mode of the optical fiber is larger than that of the space filling mode and the effective refractive index of a high-order mode of the optical fiber is smaller than that of the space filling mode, single-mode transmission of light in the optical fiber is ensured, and the air filling ratio is designed to meet the numerical values of all the air filling ratios.
Preferably, the step 4 specifically includes:
under the determined chiral parameters and air filling ratio, the effective refractive indexes of the guide mode and the space filling mode of the chiral photonic crystal fiber under different lattice constants are calculated by a two-dimensional chiral plane wave expansion method, when the effective refractive index of the fundamental mode of the fiber is larger than that of the space filling mode and the effective refractive index of the high-order mode of the fiber is smaller than that of the space filling mode, single-mode transmission of light in the fiber can be ensured, and the lattice constants are designed to meet the numerical values of all the lattice constants.
The invention has the following beneficial effects:
the scheme of the invention replaces the original scheme of the silicon-based twisted circularly-maintaining polarizing fiber sensing ring, has the advantage of low cost, and improves the accuracy of current measurement of the optical fiber current transformer system through the optimization design of the structural parameters of the chiral photonic crystal fiber sensing ring, so that the specific difference of the system is reduced from 4.5% to 0.235%.
The specific difference of the optical fiber current transformer system adopting the scheme of the silicon-based torsion panda-type circular polarization maintaining optical fiber sensing ring is 4.5 percent, the specific difference of the optical fiber current transformer system adopting the scheme of the chiral photonic crystal optical fiber sensing ring is 0.235 percent, and the result strongly proves the rationality of the parameter design of the chiral photonic crystal optical fiber designed by the patent and indicates the degree of accuracy improvement of the current measurement of the optical fiber current transformer system.
Drawings
FIG. 1 is a schematic cross-sectional structure of an optical fiber;
FIG. 2 is a graph of the effective refractive index of the guided mode and the space-filling mode of a crystal fiber as a function of the air-filling ratio of the fiber;
FIG. 3 is a graph of the effective refractive index of guided and space-filling modes of a crystal fiber as a function of the lattice constant of the fiber;
fig. 4 is a relationship between the ratio difference of the fiber current transformer system of the chiral photonic crystal fiber sensing ring and the fiber current transformer system using the silicon-based twisted polarization maintaining fiber sensing ring, which varies with the measured current.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The first embodiment is as follows:
the invention provides a design method of an optical fiber sensing ring of an optical fiber current transformer based on a 650nm wave band, which comprises the following steps:
a design method of an optical fiber sensing ring of an optical fiber current transformer based on 650nm wave band comprises the following steps:
step 1: adopting a refractive index guiding type chiral photonic crystal fiber, arranging a cross-sectional structure of the fiber with a plurality of layers of air holes, and determining the distance from the air holes to the center of the fiber;
the step 1 specifically comprises the following steps:
the cross section structure of the optical fiber is provided with 5 layers of air holes, each layer of air holes in the cross section of the optical fiber are arranged in a regular hexagon, the innermost layer of air hole in the center of the optical fiber is a layer 1 air hole, the outermost layer of air hole in the center of the optical fiber is a layer 5 air hole, the number of the layers from the innermost layer to the outermost layer is increased layer by layer, air holes A1, A2, … and A6 are layer 1 air holes, air holes B1, B2, … and B12 are layer 2 air holes, air holes C1, C2, … and C18 are layer 3 air holes, air holes D1, D2, … and D24 are layer 4 air holes, and air holes E1, E2, … and E30 are layer 5 air holes;
for the air holes in the layer 1, the distance from the A1, A2, … and A6 to the center of the optical fiber is Λ, the distances from the air holes on the whole cross section of the optical fiber are equal, namely Λ, all the air holes are round holes, the diameters of the air holes are equal, namely d, and the ratio of the diameter size of the air holes in the optical fiber to the lattice constant of the air holes in the optical fiber to the air filling ratio for defining the optical fiber is d/Λ.
Preferably, the air hole to fiber center distance Λ is taken to be 4 μm.
Step 2: determining the chiral parameters of the optical fiber according to the concentration of griseofulvin in PMMA in the refractive index guiding type chiral photonic crystal optical fiber;
the step 2 specifically comprises the following steps:
when the griseofulvin concentration in PMMA is 0.067g/cm, the corresponding optical rotation rate delta 0 Expressed by Boltzmann's formula, the corresponding optical rotation rate delta is expressed by the following formula 0 ：
Wherein, B 1 And B 2 Are all constants, B 1 ＝1.46×10 4° ·nm 2 /mm，B 2 ＝1.82×10 10° ·nm 4 /mm；
According to the optical rotation rate delta 0 Determining a chiral parameter, determining a chiral parameter xi by 0 ：
k 0 ＝2π/λ
Wherein k is 0 Is the light wave vector, and λ is the light wavelength of the light source.
And step 3: determining the air filling ratio of the optical fiber according to the obtained chiral parameters of the optical fiber and the distance from the air hole to the center of the optical fiber;
the step 3 specifically comprises the following steps:
under the determined chiral parameters and the distance from the air hole to the center of the optical fiber, the effective refractive indexes of a guiding mode and a space filling mode of the chiral photonic crystal optical fiber under different air filling ratios are calculated through a two-dimensional chiral plane wave expansion method, when the effective refractive index of a basic mode of the optical fiber is larger than that of the space filling mode and the effective refractive index of a high-order mode of the optical fiber is smaller than that of the space filling mode, single-mode transmission of light in the optical fiber is ensured, and the air filling ratio is designed to meet the numerical values of all the air filling ratios.
And 4, step 4: and determining the lattice constant of the optical fiber according to the obtained chiral parameter and the air filling ratio of the optical fiber.
The step 4 specifically comprises the following steps:
under the determined chiral parameters and air filling ratio, the effective refractive indexes of the guide mode and the space filling mode of the chiral photonic crystal fiber under different lattice constants are calculated by a two-dimensional chiral plane wave expansion method, when the effective refractive index of the fundamental mode of the fiber is larger than that of the space filling mode and the effective refractive index of the high-order mode of the fiber is smaller than that of the space filling mode, single-mode transmission of light in the fiber can be ensured, and the lattice constants are designed to meet the numerical values of all the lattice constants.
The ratio difference of the fiber optic current transformer system can be expressed as:
wherein
Wherein N is the number of coil turns, and the size of N is 10; v is the Verdet constant of the fiber, I is the measured current, Δ β is the residual linear birefringence in the fiber, and T is the intrinsic circular birefringence of the fiber.
For the silicon-based twisted panda-type circularly-maintaining polarizing fiber, the Vield constant is V 1 4.37 μ rad/A, residual linear birefringence Δ β 1 1571rad/m, circular birefringence T 1 38080 rad/m. For chiral photonic crystal fiber, the Vield constant is V 2 3.13 μ rad/A, residual linear birefringence Δ β 2 0.468rad/m, circular birefringence T 2 4.7617 rad/m. When the measured current value I is increased from 0A to 1000A, a system ratio difference comparison graph using the silicon-based twisted panda-type circularly-maintaining polarizing fiber sensing ring and the chiral photonic crystal fiber sensing ring can be obtained, respectively, as shown in fig. 4. Simulation results show that the specific difference of the optical fiber current transformer system adopting the scheme of the silicon-based torsional panda type circular polarization maintaining optical fiber sensing ring is 4.5 percent, the specific difference of the optical fiber current transformer system adopting the scheme of the chiral photonic crystal optical fiber sensing ring is 0.235 percent, and the results powerfully prove the rationality of the parameter design of the chiral photonic crystal optical fiber designed by the patent and show the degree of accuracy improvement of the current measurement of the optical fiber current transformer system.
The second embodiment is as follows:
a design method of an optical fiber sensing ring of an optical fiber current transformer based on 650nm wave band comprises the following steps:
step 1, a refractive index guiding type chiral photonic crystal fiber is adopted to replace the original rotary panda type silicon-based circularly-maintaining polarizing fiber. The substrate material of the optical fiber is polymethyl methacrylate (PMMA) doped with chiral molecular griseofulvin. The cross-sectional structure of the optical fiber has 5 layers of air holes, as shown in FIG. 1. Wherein (1) is composed of a substrate material of the optical fiber, and each layer of air holes on the cross section of the optical fiber are arranged in a regular hexagon. Defining the layer of air hole closest to the center of the optical fiber as the 1 st layer of air hole, and the layer of air hole farthest from the center of the optical fiber as the 5 th layer of air hole, and numbering the layers from the innermost layer to the outermost layer in a layer-by-layer increasing manner. In fig. 1, the chiral photonic crystal fiber is designed without air holes in the center, air holes a1, a2, … and a6 are layer 1 air holes, air holes B1, B2, … and B12 are layer 2 air holes, air holes C1, C2 and … and C18 are layer 3 air holes, air holes D1, D2, … and D24 are layer 4 air holes, and air holes E1, E2, … and E30 are layer 5 air holes. For the layer 1 air holes, all 6 air holes a1, a2, …, a6 contained therein are at a distance Λ from the center of the fiber, and are equal for air holes across the entire fiber cross-section, which is defined as the lattice constant of the fiber. All the air holes are round holes with equal diameters, which are d. The ratio of the diameter of the air hole of the optical fiber to the lattice constant thereof to the air filling ratio of the defined optical fiber is d/Λ.
And 2, after the cross-sectional structure of the optical fiber is designed, firstly, determining the chiral parameters of the optical fiber. The chiral parameter of the optical fiber is a function related to the wavelength of light, and the specific calculation process is as follows:
when the griseofulvin concentration in PMMA is 0.067g/cm, the corresponding optical rotation rate delta 0 The Boltzmann equation can be expressed as:
wherein, B 1 And B 2 Are all constants, and the numerical values are respectively B 1 ＝1.46×10 4° ·nm 2 /mm，B 2 ＝1.82×10 10° ·nm 4 And/mm. Then chiral parameter xi 0 Can be calculated from the following formula:
wherein k is 0 Is the light wave vector with a value of k 0 2 pi/lambda is the wavelength of light from the light source, and has a value of 650 nm. Chiral parameter xi obtained by calculation 0 ＝-1.1482×10 -8 rad·μm。
And 4, finally determining the lattice constant of the optical fiber. One of the values is selected from the range of values of the air-filling ratio determined in the content 3. The air filling ratio of the optical fiber is taken as 0.42, and the chiral parameter xi 0 ＝-1.1482×10 - 8 rad-. mu.m. The lattice constant Lambda of the optical fiber is from 0.4 mu m to 7 mu m, and the step length is0.2 μm. The effective refractive index n of the guided mode and the space filling mode of the chiral photonic crystal fiber can be obtained eff As a function of the lattice constant Λ of the fiber, as shown in fig. 3. When the lattice constant of the optical fiber is less than 1.2 mu m, the effective refractive indexes of the fundamental mode and the high-order mode of the optical fiber are both less than the effective refractive index of the space filling mode; when the lattice constant of the optical fiber is larger than 4.4 mu m, the effective refractive indexes of the optical fiber fundamental mode and the high-order mode are both larger than the effective refractive index of the space filling mode; since it is necessary to ensure that only one mode of light is present in the fiber for transmission, i.e., that the fundamental mode of light is transmitted in the fiber, it is necessary that the effective refractive index of the fundamental mode be greater than that of the spatially filled mode and that the effective refractive index of the higher-order modes be less than that of the spatially filled mode. Therefore, the lattice constant Λ of the optical fiber needs to be ensured to be between 1.2 μm and 4.4 μm. Where Λ is 4 μm.
The ratio difference of the fiber optic current transformer system can be expressed as:
wherein
Wherein N is the number of coil turns, and the size of N is 10; v is the Verdet constant of the fiber, I is the measured current, Δ β is the residual linear birefringence in the fiber, and T is the intrinsic circular birefringence of the fiber.
For the silicon-based twisted panda-type circularly-maintaining polarizing fiber, the Vield constant is V 1 4.37 μ rad/A, residual linear birefringence Δ β 1 1571rad/m, circular birefringence T 1 38080 rad/m. For chiral photonic crystal fiber, the Vield constant is V 2 3.13 μ rad/A, residual linear birefringence Δ β 2 0.468rad/m, circular birefringence T 2 4.7617 rad/m. When the measured current value I is increased from 0A to 1000A, a silicon-based torsion panda-shaped polarization maintaining fiber sensing ring and a silicon-based torsion panda-shaped polarization maintaining fiber sensing ringThe system ratio difference comparison chart of the sensing ring adopting the chiral photonic crystal fiber is shown in figure 4. Simulation results show that the specific difference of the optical fiber current transformer system adopting the silicon-based torsion panda-type circular polarization maintaining optical fiber sensing ring scheme is 4.5%, while the specific difference of the optical fiber current transformer system adopting the sex photonic crystal optical fiber sensing ring scheme is 0.235%, and the results powerfully prove the rationality of the parameter design of the chiral photonic crystal optical fiber designed by the patent and show the accuracy improvement degree of the current measurement of the optical fiber current transformer system.
The scheme provides a photonic crystal fiber sensing ring scheme made of a novel polymer material, replaces the original silicon-based torsion circularly-protected polarized fiber sensing ring scheme, has the advantage of low cost, and improves the accuracy of current measurement of an optical fiber current transformer system through the optimization design of the structural parameters of the chiral photonic crystal fiber sensing ring, so that the specific difference of the system is reduced to 0.235% from 4.5%.
The above description is only a preferred embodiment of the design method of the optical fiber sensing ring of the optical fiber current transformer based on the 650nm band, and the protection range of the design method of the optical fiber sensing ring of the optical fiber current transformer based on the 650nm band is not limited to the above embodiments, and all technical solutions belonging to the idea belong to the protection range of the present invention. It should be noted that modifications and variations which do not depart from the gist of the invention will be those skilled in the art to which the invention pertains and which are intended to be within the scope of the invention.
Claims (2)
1. A design method of an optical fiber sensing ring of an optical fiber current transformer based on 650nm wave band is characterized by comprising the following steps: the method comprises the following steps:
step 1: adopting a refractive index guiding type chiral photonic crystal fiber, wherein the cross section structure of the fiber is provided with a plurality of layers of air holes;
the step 1 specifically comprises the following steps:
the cross section structure of the optical fiber is provided with 5 layers of air holes, each layer of air holes in the cross section of the optical fiber is arranged in a regular hexagon, the innermost layer of air holes in the center of the optical fiber is the 1 st layer of air holes, the outermost layer of air holes in the center of the optical fiber is the 5 th layer of air holes, and the numbers from the innermost layer to the outermost layer are increased gradually layer by layer;
for the 1 st layer of air holes, the distance from all the 6 air holes to the center of the optical fiber is Λ, the distances of the air holes on the cross section of the whole optical fiber are equal, the distances are Λ, all the air holes are round holes, the diameters of the air holes are equal, the ratio of the diameter of each optical fiber air hole to the lattice constant of the optical fiber air hole is d/Λ, and the air filling ratio of the defined optical fiber is d/Λ;
step 2: determining the chiral parameters of the optical fiber according to the concentration of griseofulvin in PMMA in the refractive index guiding type chiral photonic crystal optical fiber;
the step 2 specifically comprises the following steps:
when the griseofulvin concentration in PMMA is 0.067g/cm, the corresponding optical rotation rate delta 0 Expressed by Boltzmann's formula, the corresponding optical rotation rate delta is expressed by the following formula 0 ：
Wherein, B 1 And B 2 Are all constants, B 1 ＝1.46×10 4° ·nm 2 /mm，B 2 ＝1.82×10 10° ·nm 4 /mm；
According to the optical rotation rate delta 0 Determining a chiral parameter, determining a chiral parameter xi by 0 ：
k 0 ＝2π/λ
Wherein k is 0 Is the light wave vector, λ is the light wavelength of the light source;
and 3, step 3: determining the value range of the air filling ratio of the optical fiber according to the obtained chiral parameters and the determined lattice constant of the optical fiber, and taking a value as the final air filling ratio of the optical fiber;
the step 3 specifically comprises the following steps:
under the determined chiral parameters and the distance from the air hole to the center of the optical fiber, calculating the effective refractive indexes of a chiral photonic crystal optical fiber guided mode and a space filling mode under different air filling ratios by a two-dimensional chiral plane wave expansion method, and when the effective refractive index of a fiber base mode is greater than that of the space filling mode and the effective refractive index of a fiber high-order mode is less than that of the space filling mode, ensuring that light performs single-mode transmission in the optical fiber and designing the air filling ratio to meet the numerical values of all the air filling ratios;
and 4, step 4: and determining the value range of the lattice constant of the optical fiber according to the obtained chiral parameter and the air filling ratio of the optical fiber, and taking any value as the final lattice constant of the optical fiber.
2. The design method of the optical fiber sensing ring of the optical fiber current transformer based on 650nm wave band as claimed in claim 1, wherein: the step 4 specifically comprises the following steps:
under the determined chiral parameters and air filling ratio, the effective refractive indexes of the guide mode and the space filling mode of the chiral photonic crystal fiber under different lattice constants are calculated by a two-dimensional chiral plane wave expansion method, when the effective refractive index of the fundamental mode of the fiber is larger than that of the space filling mode and the effective refractive index of the high-order mode of the fiber is smaller than that of the space filling mode, single-mode transmission of light in the fiber can be ensured, and the lattice constants are designed to meet the numerical values of all the lattice constants.
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