CN109633812B - Panda type polymer polarization maintaining optical fiber and application thereof - Google Patents
Panda type polymer polarization maintaining optical fiber and application thereof Download PDFInfo
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- CN109633812B CN109633812B CN201910042531.XA CN201910042531A CN109633812B CN 109633812 B CN109633812 B CN 109633812B CN 201910042531 A CN201910042531 A CN 201910042531A CN 109633812 B CN109633812 B CN 109633812B
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- G—PHYSICS
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- 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
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- 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
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Abstract
The invention provides a panda type polymer polarization maintaining optical fiber and application thereof, wherein the material of the optical fiber core area of the panda type polymer polarization maintaining optical fiber is polymethyl methacrylate polymer material doped with polycarbonate, polystyrene and polyvinylidene fluoride material, on the basis of the polymethyl methacrylate material with high light transmittance, the toughness of the core area and the light transmittance of 850nm and 650nm are increased, and the short wavelength light guide characteristic and the mechanical strength of the optical fiber core area are improved; the material of the optical fiber stress area is polymethyl methacrylate polymer material doped with polycarbonate, polyurethane, polytetrafluoroethylene and ethylene-tetrafluoroethylene copolymer material, so that the stress application capacity is greatly improved, and the refractive index of the stress area is adjusted more flexibly.
Description
Technical Field
The invention relates to the technical field of optical fibers, in particular to a panda type polymer polarization maintaining optical fiber and application thereof.
Background
The polarization maintaining optical fiber is used for transmitting linearly polarized light, is widely applied to various fields of national economy such as aerospace, aviation, navigation, industrial manufacturing technology, communication and the like, and can ensure that the linear polarization direction is unchanged and improve the coherent signal-to-noise ratio in an interference optical fiber sensor based on optical coherent detection so as to realize high-precision measurement of physical quantity; the polarization maintaining fiber is used as a special fiber, is mainly applied to sensors such as fiber current transformers, fiber optic gyroscopes and fiber optic hydrophones and fiber optic communication systems such as DWDM and EDFA, and is a special fiber type with wide application value. The stress double refraction polarization maintaining fiber mainly comprises a bow tie type polarization maintaining fiber, a panda type polarization maintaining fiber and an elliptical cladding type polarization maintaining fiber. The panda type polarization maintaining fiber is most widely used, and the structure of the polarization maintaining fiber comprises a fiber core, a stress area and a cladding part, wherein the fiber core is positioned in the central part of the cladding, and two cylindrical stress areas are distributed on two sides of the fiber core, so that the polarization maintaining fiber has linear polarization maintaining performance due to the so-called stress birefringence. In design, the birefringence performance of the polarization maintaining fiber is mainly adjusted by changing the structures and the stress doping of two symmetrical cylindrical stress regions.
In chinese patent 201711052703.9, a panda-type polarization maintaining fiber with a titanium dioxide-doped silica quartz glass core layer is described, wherein a core rod, a sleeve and a hole are used to prepare a mother rod, and a boron-doped stress rod is inserted to form a stress-type structure, the whole material substrate is silica quartz glass, which causes great mismatch between the thermal expansion coefficients of the encircling glue and the quartz material during sensing, and random asymmetric thermal stress, thereby reducing sensing accuracy and signal-to-noise ratio; meanwhile, the punching process is easy to form larger resident stress in the prefabricated rod, and the temperature environment performance of the polarization maintaining optical fiber is greatly influenced. In the chinese patent 201810301307.3, a rare earth doped panda type polarization maintaining fiber with a silica quartz glass core layer co-doped with ytterbium, aluminum and phosphorus is described, the working waveband of the fiber is 1064nm, the minimum design value of the beat length is 3.2mm, and the design performance requirements cannot be met in high-precision sensing. Chinese patent 201810297512.7 describes a panda-type polarization maintaining fiber working at 1550nm band, which has core parameters to ensure the dispersion displacement value of the fiber and has polarization maintaining effect, complex waveguide structure, difficult control of repeated consistency and high requirements for process and equipment. In chinese patent 201610412177.1, a method for preparing a polarization maintaining optical fiber is described, wherein a prefabricated mold is used to inject silica liquid to obtain a quartz sleeve, and the quartz sleeve is polished and melted, and then mixed powder of silica and boron trioxide is injected to combine into a panda type polarization maintaining optical fiber preform; the specific design structure and dimensional parameters of the preform are not described in detail, nor is a shaped preform directly available for drawing. In chinese patent 201610457293.5, a preparation method of panda polarization maintaining optical fiber preform is described, nano-porous silica powder is added into rare earth and co-doped ion inorganic salt solution to form suspension, and no specific preform forming parameters and preform drawing capability are provided.
The polymer optical fiber has the following structure: the surrounding of the core fiber containing a transparent resin is surrounded by a cladding containing a lower refractive index than the aforementioned transparent resin, and is a medium that causes light to be reflected at the boundary between the core layer and the cladding so that an optical signal is transmitted within the core. Polymer optical fibers have advantages over silica glass optical fibers in that they are superior in flexibility and can be used as optical fibers having a large diameter, which are easy to overlap cores when connected. The polymer optical fiber is an optical fiber which uses high-transparency amorphous isotropic polymer such as polystyrene, polymethyl methacrylate and polycarbonate as a core material and fluororesin as a cladding material. Different materials have different optical attenuation properties and temperature application ranges. The polymer optical fiber can be used for the last 100-1000 meters of an access network, can also be used for various vehicles such as automobiles and airplanes, and is an excellent short-distance data transmission medium. Polymer optical fibers are lightweight, flexible, and more resistant to breakage (vibration and bending). The polymer optical fiber has the characteristics of excellent tensile strength, durability and small occupied space. Compared with the quartz optical fiber, the method has the following advantages: the modulus is low, the numerical aperture is large, the coupling efficiency is high, the flexibility is good, and the processing and the use are easy; a low-loss window is arranged in a visible light area; the weight is light; low cost and processing cost, etc. The beat length of the short wavelength is short, the birefringence effect is stronger, and the intensity of polarization maintaining can be improved, so that the sensing precision and the signal-to-noise ratio are enhanced. Symmetrical thermal stress. The polymer optical fiber has various doping proportioning forms, higher doping concentration and various and flexible waveguide structure designs, and is easy to realize.
Disclosure of Invention
In view of the above, the present invention provides a panda type polymer polarization maintaining fiber capable of being used in short wavelength, having high precision sensing and coating-free protection, and its application.
The technical scheme of the invention is realized as follows: in one aspect, the invention provides a panda-type polymer polarization maintaining fiber, which comprises a fiber cladding region, a fiber core region and a fiber stress region, wherein the fiber core region is positioned in the center of the fiber cladding region, the fiber stress regions are symmetrically distributed on two sides of the fiber core region and positioned in the fiber cladding region, and the material of the fiber cladding region is polymethyl methacrylate doped with polycarbonate, polystyrene, polyvinylidene fluoride and polypropylene; the optical fiber core region is made of polymethyl methacrylate doped with polycarbonate, polystyrene and polyvinylidene fluoride; the material of the optical fiber stress region is polymethyl methacrylate doped with polycarbonate, polyurethane, polytetrafluoroethylene and ethylene-tetrafluoroethylene copolymer.
On the basis of the above technical solution, preferably, the optical fiber cladding region comprises 100% by mass of the total mass of the optical fiber cladding region, and the mass percentages of the doping components are: 0.5-8% of polycarbonate, 0.5-10% of polystyrene, 1-6% of polyvinylidene fluoride, 3-15% of polypropylene and the balance of polymethyl methacrylate.
On the basis of the above technical scheme, preferably, the optical fiber core region comprises, by mass, 100% of the total mass of the optical fiber core region, and the doping components in mass percent: 1-10% of polycarbonate, 0.5-5% of polystyrene, 3-15% of polyvinylidene fluoride and the balance of polymethyl methacrylate.
On the basis of the above technical scheme, preferably, the optical fiber stress region comprises, by mass, 100% of the total mass of the optical fiber stress region, and the mass percentages of the doping components are: 0.1-3% of polycarbonate, 0.3-5% of polyurethane, 1-20% of polytetrafluoroethylene, 1-8% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
In addition to the above technical solution, preferably, the refractive index value n1 of the fiber cladding region is 1.46 to 1.49; the refractive index value n2 of the optical fiber core region is 1.462-1.527; the refractive index value n3 of the stress region of the optical fiber is 1.401-1.488.
In addition to the above technical means, preferably, the calculation formula of the refractive index difference percentage of the optical fiber core region with respect to the optical fiber cladding region is [ (n2-n 1)/(n 1] × 100%, and the refractive index difference percentage of the optical fiber core region with respect to the optical fiber cladding region is 0.1 to 2.5%.
Based on the above technical solution, the calculation formula of the refractive index difference percentage of the fiber stress region relative to the fiber cladding region is preferably [ (n3-n1) ÷ n1] × 100%, and the refractive index difference percentage of the fiber stress region relative to the fiber cladding region is-4 to-0.1%.
Based on the above technical solution, preferably, the diameter D1 of the fiber cladding region is 30-120 μm; the diameter D2 of the optical fiber core region is 3.0-10 μm; the diameter D3 of the optical fiber stress region is 3-20 μm, and the distance D4 between two symmetrically distributed optical fiber stress regions is 3.5-20 μm.
In addition to the above technical means, it is preferable that the optical sensor can operate in a short wavelength window of 850nm or less.
On the other hand, the invention provides an application of the panda type polymer polarization maintaining fiber, which is characterized in that: the optical fiber gyroscope can be applied to the fields of small optical fiber gyroscopes, optical fiber hydrophones and optical fiber amplifiers.
Compared with the prior art, the panda type polymer polarization maintaining optical fiber and the application thereof have the following beneficial effects:
(1) the material of the fiber core area of the panda type polymer polarization maintaining fiber is a polymethyl methacrylate polymer material doped with polycarbonate, polystyrene and polyvinylidene fluoride materials, on the basis of the polymethyl methacrylate material with high light transmittance, the toughness of the core area and the light transmittance of 850nm and 650nm are increased, and the short-wavelength light guide property and the mechanical strength of the fiber core area are improved;
(2) the material of the fiber stress region of the panda type polymer polarization maintaining fiber is a polymethyl methacrylate polymer material doped with polycarbonate, polyurethane, polytetrafluoroethylene and ethylene-tetrafluoroethylene copolymer material, so that the stress application capacity is greatly improved, and the refractive index of the stress region is adjusted more flexibly;
(3) the material of the fiber cladding region of the panda-type polymer polarization maintaining fiber is a polymethyl methacrylate polymer material doped with polycarbonate, polystyrene, polyvinylidene fluoride and polypropylene materials, so that the material characteristics of the core region and the cladding region are matched, the temperature and humidity aging resistance of the cladding region is enhanced, and the environmental temperature stability of the fiber is improved;
(4) according to the panda type polymer polarization maintaining optical fiber, the whole optical fiber material is constructed by polymer materials, and the polymer material medium has low intrinsic material loss at the wavelength of 850nm and below, so that the optical fiber can have good transmission characteristics at a short wavelength band; the low-cost photoelectric device of the short wavelength window can provide powerful technical support for a low-cost miniaturized sensing system;
(5) according to the panda type polymer polarization maintaining optical fiber, the whole body of the optical fiber is made of polymer materials, an external protective coating layer is not required to be coated, the process requirement of optical fiber drawing is reduced, the negative influence of thermal stress mismatch of different materials of an optical fiber cladding and the coating layer is avoided, the geometric size of the optical fiber is further reduced, the smaller sensing unit volume can be provided, and product support is provided for miniaturization of devices and systems;
(6) according to the panda type polymer polarization maintaining optical fiber, the core area and the stress area of the optical fiber can be processed and prepared in a casting polymerization molding mode, and large processing stress caused by a traditional quartz optical fiber punching process is avoided, so that the stress area can be close to the core area, the stress applying efficiency is enhanced, the possibility is brought to the design of small stress area and large birefringence, the reduction of the stress area can also reduce the geometric dimension of the optical fiber, and the miniaturized optical fiber design is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a panda-type polymer polarization maintaining fiber according to the present invention;
FIG. 2 is a schematic diagram of the refractive index distribution in the stress axis direction of a panda-type polymer polarization maintaining fiber according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
A short-wavelength high-precision coating-free panda-type polymer polarization maintaining fiber comprises a fiber cladding region 101, a fiber core region 102 and a fiber stress region 103, wherein the fiber core region 102 is positioned in the center of the fiber cladding region 101, the fiber stress region 103 is symmetrically distributed on two sides of the fiber core region 102 and positioned in the fiber cladding region 101, and the doped components of each doped material of the fiber cladding region 101 are respectively as follows by mass percent: 4% of polycarbonate, 6% of polystyrene, 3% of polyvinylidene fluoride and 9% of polypropylene; the doping component mass percentage content of each doping material of the optical fiber core region 102 is as follows: 5% of polycarbonate, 2% of polystyrene and 8% of polyvinylidene fluoride; the doping components of each doping material of the optical fiber stress region 103 are as follows by mass percent: 1.5% of polycarbonate, 3% of polyurethane, 9% of polytetrafluoroethylene, 5% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
As shown in fig. 2, n1 is the refractive index of the fiber cladding region 101, n2 is the refractive index value of the fiber core region 102, n3 is the refractive index of the fiber stress region 103, and the refractive index value n1 of the fiber cladding region 101 is 1.483; the refractive index value n2 of the core region 102 is 1.501; the fiber stress region 103 has a refractive index value n3 of 1.453.
The percent difference in refractive index of the fiber core region 102 relative to the fiber cladding region 101 is 1.2%; the percent difference in refractive index of the fiber stress region 103 relative to the fiber cladding region 101 is-2%.
The diameter D1 of the fiber-cladding region 101 was 100 μm; the diameter D2 of the core region 102 is 4.5 μm; the diameter D3 of the fiber stress region 103 is 16 μm, where the separation D4 of two symmetrically distributed fiber stress regions 103 is 8 μm.
The stress type polymer polarization maintaining fiber prepared by adopting the design structure parameters and the preparation process is a structure of a panda type polymer polarization maintaining fiber, and the realized main birefringence performance is as follows:
polarization crosstalk: the working wavelength reaches-26 dB/km at 850nm and reaches-24 dB/km at 650 nm;
beat length: the wavelength of the working light reaches 1.8mm at 850nm and reaches 1.4mm at 650 nm.
Example two
A short-wavelength high-precision coating-free panda-type polymer polarization maintaining fiber comprises a fiber cladding region 101, a fiber core region 102 and a fiber stress region 103, wherein the fiber core region 102 is positioned in the center of the fiber cladding region 101, the fiber stress region 103 is symmetrically distributed on two sides of the fiber core region 102 and positioned in the fiber cladding region 101, and the doped components of each doped material of the fiber cladding region 101 are respectively as follows by mass percent: 7% of polycarbonate, 9% of polystyrene, 5% of polyvinylidene fluoride and 13% of polypropylene; the doping component mass percentage content of each doping material of the optical fiber core region 102 is as follows: 4% of polycarbonate, 2% of polystyrene and 13% of polyvinylidene fluoride; the doping components of each doping material of the optical fiber stress region 103 are as follows by mass percent: 1.9% of polycarbonate, 2% of polyurethane, 14% of polytetrafluoroethylene, 4% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
As shown in fig. 2, n1 is the refractive index of fiber cladding region 101, n2 is the refractive index value of fiber core region 102, n3 is the refractive index of fiber stress region 103, and the refractive index value n1 of fiber cladding region 101 is 1.478; the refractive index value n2 of the core region 102 is 1.501; the fiber stress region 103 has a refractive index value n3 of 1.453.
The percent difference in refractive index of the fiber core region 102 relative to the fiber cladding region 101 is 1.7%; the percent difference in refractive index of the fiber stress region 103 relative to the fiber cladding region 101 is-2.3%.
The diameter D1 of the fiber-cladding region 101 was 80 μm; the diameter D2 of the core region 102 is 5.7 μm; the diameter D3 of the fiber stress region 103 was 17 μm, with the separation D4 of two symmetrically distributed fiber stress regions 103 being 14 μm.
The stress type polymer polarization maintaining fiber prepared by adopting the design structure parameters and the preparation process is a structure of a panda type polymer polarization maintaining fiber, and the realized main birefringence performance is as follows:
the mode birefringence of the fiber was 4.2X 10-4；
Polarization crosstalk: the working wavelength reaches-26.9 dB/km at 850nm and reaches-25.5 dB/km at 650 nm;
beat length: the wavelength of the working light reaches 2.5mm at 850nm and reaches 1.9mm at 650 nm.
EXAMPLE III
A short-wavelength high-precision coating-free panda-type polymer polarization maintaining fiber comprises a fiber cladding region 101, a fiber core region 102 and a fiber stress region 103, wherein the fiber core region 102 is positioned in the center of the fiber cladding region 101, the fiber stress region 103 is symmetrically distributed on two sides of the fiber core region 102 and positioned in the fiber cladding region 101, and the doped components of each doped material of the fiber cladding region 101 are respectively as follows by mass percent: 0.5% of polycarbonate, 0.5% of polystyrene, 1% of polyvinylidene fluoride and 3% of polypropylene; the doping component mass percentage content of each doping material of the optical fiber core region 102 is as follows: 1% of polycarbonate, 0.5% of polystyrene and 3% of polyvinylidene fluoride; the doping components of each doping material of the optical fiber stress region 103 are as follows by mass percent: 0.1% of polycarbonate, 0.3% of polyurethane, 1% of polytetrafluoroethylene, 1% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
As shown in fig. 2, n1 is the refractive index of the fiber cladding region 101, n2 is the refractive index value of the fiber core region 102, n3 is the refractive index of the fiber stress region 103, and the refractive index value n1 of the fiber cladding region 101 is 1.46; the refractive index value n2 of the core region 102 is 1.503; the fiber stress region 103 has a refractive index value n3 of 1.444.
The percent difference in refractive index of the fiber core region 102 relative to the fiber cladding region 101 is 0.1%; the percent difference in refractive index of the fiber stress region 103 relative to the fiber cladding region 101 is-4%.
The diameter D1 of the fiber-cladding region 101 was 30 μm; the diameter D2 of the core region 102 is 3 μm; the diameter D3 of the fiber stress region 103 is 3 μm, where the separation D4 of two symmetrically distributed fiber stress regions 103 is 3.5 μm.
The stress type polymer polarization maintaining fiber prepared by adopting the design structure parameters and the preparation process is a structure of a panda type polymer polarization maintaining fiber, and the realized main birefringence performance is as follows:
the mode birefringence of the optical fiber was 1.2X 10-4；
Polarization crosstalk: the working wavelength reaches-26.5 dB/km at 850nm and reaches-25.3 dB/km at 650 nm;
beat length: the wavelength of the working light reaches 1.4mm at 850nm and reaches 1.1mm at 650 nm.
Example four
A short-wavelength high-precision coating-free panda-type polymer polarization maintaining fiber comprises a fiber cladding region 101, a fiber core region 102 and a fiber stress region 103, wherein the fiber core region 102 is positioned in the center of the fiber cladding region 101, the fiber stress region 103 is symmetrically distributed on two sides of the fiber core region 102 and positioned in the fiber cladding region 101, and the doped components of each doped material of the fiber cladding region 101 are respectively as follows by mass percent: 8% of polycarbonate, 10% of polystyrene, 6% of polyvinylidene fluoride and 15% of polypropylene; the doping component mass percentage content of each doping material of the optical fiber core region 102 is as follows: 10% of polycarbonate, 5% of polystyrene and 15% of polyvinylidene fluoride; the doping components of each doping material of the optical fiber stress region 103 are as follows by mass percent: 3% of polycarbonate, 5% of polyurethane, 20% of polytetrafluoroethylene, 8% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
As shown in fig. 2, n1 is the refractive index of the fiber cladding region 101, n2 is the refractive index value of the fiber core region 102, n3 is the refractive index of the fiber stress region 103, and the refractive index value n1 of the fiber cladding region 101 is 1.49; the refractive index value n2 of the core region 102 is 1.462; the fiber stress region 103 has a refractive index value n3 of 1.401.
The percent difference in refractive index of the fiber core region 102 relative to the fiber cladding region 101 is 2.5%; the percent difference in refractive index of the fiber stress region 103 relative to the fiber cladding region 101 is-0.1%.
The diameter D1 of the fiber-cladding region 101 was 120 μm; the diameter D2 of the core region 102 is 10 μm; the diameter D3 of the fiber stress region 103 is 20 μm, where the separation D4 of two symmetrically distributed fiber stress regions 103 is 20 μm.
The stress type polymer polarization maintaining fiber prepared by adopting the design structure parameters and the preparation process is a structure of a panda type polymer polarization maintaining fiber, and the realized main birefringence performance is as follows:
the mode birefringence of the fiber was 5.6X 10-4；
Polarization crosstalk: the working wavelength reaches-27.2 dB/km at 850nm and reaches-25.6 dB/km at 650 nm;
beat length: the wavelength of the light source reaches 4.6mm at 850nm and reaches 3.6mm at 650 nm.
EXAMPLE five
A short-wavelength high-precision coating-free panda-type polymer polarization maintaining fiber comprises a fiber cladding region 101, a fiber core region 102 and a fiber stress region 103, wherein the fiber core region 102 is positioned in the center of the fiber cladding region 101, the fiber stress region 103 is symmetrically distributed on two sides of the fiber core region 102 and positioned in the fiber cladding region 101, and the doped components of each doped material of the fiber cladding region 101 are respectively as follows by mass percent: 1.1% of polycarbonate, 1.3% of polystyrene, 2% of polyvinylidene fluoride and 5% of polypropylene; the doping component mass percentage content of each doping material of the optical fiber core region 102 is as follows: 3% of polycarbonate, 1% of polystyrene and 5% of polyvinylidene fluoride; the doping components of each doping material of the optical fiber stress region 103 are as follows by mass percent: 0.4% of polycarbonate, 0.7% of polyurethane, 5% of polytetrafluoroethylene, 3% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
As shown in fig. 2, n1 is the refractive index of the fiber cladding region 101, n2 is the refractive index value of the fiber core region 102, n3 is the refractive index of the fiber stress region 103, and the refractive index value n1 of the fiber cladding region 101 is 1.47; the refractive index value n2 of the core region 102 is 1.527; the fiber stress region 103 has a refractive index value n3 of 1.488.
The percent difference in refractive index of the fiber core region 102 relative to the fiber cladding region 101 is 2%; the percent difference in refractive index of the fiber stress region 103 relative to the fiber cladding region 101 is-0.7%.
The diameter D1 of the fiber-cladding region 101 was 40 μm; the diameter D2 of the core region 102 is 5 μm; the diameter D3 of the fiber stress region 103 is 9 μm, where the separation D4 of two symmetrically distributed fiber stress regions 103 is 6.8 μm.
The stress type polymer polarization maintaining fiber prepared by adopting the design structure parameters and the preparation process is a structure of a panda type polymer polarization maintaining fiber, and the realized main birefringence performance is as follows:
the mode birefringence of the optical fiber was 1.5X 10-4；
Polarization crosstalk: the working wavelength reaches-25.3 dB/km at 850nm and reaches-25.1 dB/km at 650 nm;
beat length: the wavelength of the working light reaches 2.1mm at 850nm and reaches 1.6mm at 650 nm.
EXAMPLE six
A short-wavelength high-precision coating-free panda-type polymer polarization maintaining fiber comprises a fiber cladding region 101, a fiber core region 102 and a fiber stress region 103, wherein the fiber core region 102 is positioned in the center of the fiber cladding region 101, the fiber stress region 103 is symmetrically distributed on two sides of the fiber core region 102 and positioned in the fiber cladding region 101, and the doped components of each doped material of the fiber cladding region 101 are respectively as follows by mass percent: 3% of polycarbonate, 4% of polystyrene, 4% of polyvinylidene fluoride and 8% of polypropylene; the doping component mass percentage content of each doping material of the optical fiber core region 102 is as follows: 7% of polycarbonate, 4% of polystyrene and 10% of polyvinylidene fluoride; the doping components of each doping material of the optical fiber stress region 103 are as follows by mass percent: 2.3% of polycarbonate, 4% of polyurethane, 10% of polytetrafluoroethylene, 7% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
As shown in fig. 2, n1 is the refractive index of the fiber cladding region 101, n2 is the refractive index value of the fiber core region 102, n3 is the refractive index of the fiber stress region 103, and the refractive index value n1 of the fiber cladding region 101 is 1.489; the refractive index value n2 of the core region 102 is 1.5; the fiber stress region 103 has a refractive index value n3 of 1.46.
The percent difference in refractive index of the fiber core region 102 relative to the fiber cladding region 101 is 0.6%; the percent difference in refractive index of the fiber stress region 103 relative to the fiber cladding region 101 is-3%.
The diameter D1 of the fiber-cladding region 101 was 60 μm; the diameter D2 of the core region 102 is 8.9 μm; the diameter D3 of the fiber stress region 103 is 13 μm, where the separation D4 of two symmetrically distributed fiber stress regions 103 is 10 μm.
The stress type polymer polarization maintaining fiber prepared by adopting the design structure parameters and the preparation process is a structure of a panda type polymer polarization maintaining fiber, and the realized main birefringence performance is as follows:
the mode birefringence of the optical fiber was 3.1X 10-4；
Polarization crosstalk: the working wavelength reaches-26.7 dB/km at 850nm and reaches-25.4 dB/km at 650 nm;
beat length: the wavelength of the light source reaches 3.3mm at 850nm and reaches 2.5mm at 650 nm.
In the second to sixth embodiments, the polymer polarization maintaining fiber product of the present invention is designed for 5 different material doping ratios and geometric parameter structures, and the short wavelength high precision coating-free panda type polymer polarization maintaining fiber is manufactured by the same preparation process. The results show that the adjustable range of the mode birefringence of 5 fibers is 1.2X 10-4-5.6×10-4Leading to a beat length of 850nm for the fiber in the range of 1.4-4.6mm and a beat length of 650nm in the range of 1.1-3.6 mm. Under the structural design of such a large adjustment range of stress birefringence of the polymer polarization maintaining fiber, the polarization crosstalk of the fiber can be maintained at 850nm and 650nmThe higher level of-25 dB/km can meet the requirements of 650-850nm short wavelength multi-window performance design of stress type polymer polarization maintaining optical fiber in different application fields.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A panda type polymer polarization maintaining fiber, comprising a fiber cladding region (101), a fiber core region (102) and a fiber stress region (103), wherein the fiber core region (102) is located at the center of the fiber cladding region (101), and the fiber stress region (103) is symmetrically distributed at two sides of the fiber core region (102) and located in the fiber cladding region (101), characterized in that: the material of the optical fiber cladding region (101) is polymethyl methacrylate doped with polycarbonate, polystyrene, polyvinylidene fluoride and polypropylene; the optical fiber core region (102) is made of polymethyl methacrylate doped with polycarbonate, polystyrene and polyvinylidene fluoride; the optical fiber stress region (103) is made of polymethyl methacrylate doped with polycarbonate, polyurethane, polytetrafluoroethylene and ethylene-tetrafluoroethylene copolymer, and the optical fiber stress region comprises the following doping components in percentage by mass, with the total mass percentage of the optical fiber cladding region (101) being 100 percent: 0.5-8% of polycarbonate, 0.5-10% of polystyrene, 1-6% of polyvinylidene fluoride, 3-15% of polypropylene and the balance of polymethyl methacrylate; the total mass percentage of the optical fiber core area (102) is 100 percent, and the mass percentage of each doping component is as follows: 1-10% of polycarbonate, 0.5-5% of polystyrene, 3-15% of polyvinylidene fluoride and the balance of polymethyl methacrylate; the total mass percentage of the fiber stress region (103) is 100%, and the mass percentage of each doping component is as follows: 0.1-3% of polycarbonate, 0.3-5% of polyurethane, 1-20% of polytetrafluoroethylene, 1-8% of ethylene-tetrafluoroethylene copolymer and the balance of polymethyl methacrylate.
2. The panda-type polymer polarization maintaining fiber of claim 1, wherein: the refractive index value n1 of the fiber cladding region (101) is 1.46-1.49; the refractive index value n2 of the optical fiber core region (102) is 1.462-1.527; the refractive index value n3 of the optical fiber stress region (103) is 1.401-1.488.
3. The panda-type polymer polarization maintaining fiber of claim 1, wherein: the refractive index difference percentage of the optical fiber core region (102) with respect to the optical fiber cladding region (101) is calculated as [ (n2-n 1)/(n 1] × 100%, and the refractive index difference percentage of the optical fiber core region (102) with respect to the optical fiber cladding region (101) is 0.1-2.5%.
4. The panda-type polymer polarization maintaining fiber of claim 1, wherein: the percent difference in refractive index of the fiber stress region (103) relative to the fiber cladding region (101) is calculated as [ (n3-n 1)/(n 1] × 100%, and the percent difference in refractive index of the fiber stress region (103) relative to the fiber cladding region (101) is-4-0.1%.
5. The panda-type polymer polarization maintaining fiber of claim 1, wherein: the diameter D1 of the fiber cladding region (101) is 30-120 μm; the diameter D2 of the optical fiber core region (102) is 3.0-10 μm; the diameter D3 of the optical fiber stress region (103) is 3-20 μm, and the distance D4 between two symmetrically distributed optical fiber stress regions (103) is 3.5-20 μm.
6. The panda-type polymer polarization maintaining fiber of claim 1, wherein: can operate in a short wavelength window below 850 nm.
7. The use of the panda-type polymer polarization maintaining fiber according to any one of claims 1 to 6 in the fields of fiber optic gyroscopes, fiber optic hydrophones and fiber optic amplifiers.
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