CN110596816A - Optical fiber filter regulated and controlled by double-period magnetic field - Google Patents
Optical fiber filter regulated and controlled by double-period magnetic field Download PDFInfo
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- CN110596816A CN110596816A CN201910845074.8A CN201910845074A CN110596816A CN 110596816 A CN110596816 A CN 110596816A CN 201910845074 A CN201910845074 A CN 201910845074A CN 110596816 A CN110596816 A CN 110596816A
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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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
- G02B6/29317—Light guides of the optical fibre type
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/095—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention provides a fiber filter regulated and controlled by a double-period magnetic field, which is characterized in that: the optical fiber filter is composed of an input optical fiber 1, a hole-assisted optical fiber 2 and an output optical fiber 3, wherein the input optical fiber 1 mainly comprises a fiber core 101 and a cladding 102, the output optical fiber 3 comprises a fiber core 301 and a cladding 302, and the hole-assisted optical fiber 2 mainly comprises a fiber core 201, a cladding 202 and an air hole 203. The air hole 203 utilizes a micro injection pump to respectively and orthogonally infuse magnetic liquid and non-magnetic liquid into the hole-assisted optical fibers with four holes to form two optical fiber gratings 4 with different refractive indexes, so that the modulation of the hole-assisted optical fibers on incident light is realized, meanwhile, the refractive index of magnetic fluid in the hole-assisted optical fibers can be adjusted through an external magnetic field, the effective refractive index of a hole-assisted optical fiber grating cladding is changed, and the wavelength of a resonance peak of the optical fiber grating is moved. The invention can be used for optical filtering and optical fiber sensing, has the advantages of adjustable grating refractive index, easy manufacture and the like, and belongs to the technical field of optical fiber communication and optical fiber sensing.
Description
(I) technical field
The invention relates to a fiber filter for regulating and controlling a bicycle magnetic field, belonging to the field of fiber sensing and fiber communication.
(II) background of the invention
Long period fiber gratings have made significant progress since 1996 a.m. vengsarkar et al prepared the first LPFG on hydrogen-loaded single-mode fiber by uv exposure. At present, methods for preparing long-period fiber gratings include an ultraviolet exposure preparation method, a CO2 laser preparation method, an arc discharge preparation method, a femtosecond laser preparation method, an etching groove preparation method, a mechanical microbend preparation method and an ion beam preparation method, wherein the ultraviolet exposure preparation method is most commonly used. The long-period fiber grating is sensitive to external environment changes such as stress, temperature, pressure and the like, so that the fiber grating can be used as a stress sensor, a temperature sensor and a pressure sensor. The light transmission mechanism of the long-period fiber grating is that the energy of a fundamental mode is coupled with the energy of a cladding mode under the condition of meeting resonance, then the energy of the cladding mode is attenuated after being transmitted for a certain distance, and a loss peak is formed on a transmission spectrum.
A magnetic control tunable filter based on a long-period fiber grating is proposed in the patent of the publication No. CN103207465A, namely, the long-period grating is written on the fiber core of an optical fiber, magnetic fluid is injected into the air hole of a microstructure fiber, and the refractive index of a cladding is changed through a magnetic field, so that the resonance wavelength of the long-period fiber grating is changed. Compared with the traditional long-period fiber grating, the manufacturing method has great improvement on the filtering spectral band, but can still filter only one waveband. In the literature, "Jung H, Seo Y G, HaW, et al, mask-free, short-fiber, long-fiber, polymerization in silica hollow optical fiber [ J ]. Optics Letters,2009,34(18): 2745-. The grating prepared by the preparation method has the advantage that once the polymer in the air hole is cured by ultraviolet, the grating period cannot be changed. Also in the literature, "Kerbage C, Eggleton B J. Flexible microfluidic optical fiber gratings [ J ]. Applied Physics Letters,2003,82(9): 1338", it is proposed to fill a fiber containing six air holes with a benzotrifluoride liquid, and to control the ratio of magnetic fluid and air injected into the air holes of the fiber by the rotational frequency of a motor, thereby achieving the effect of modulating the period of the fiber grating. The method can prepare the microfluidic fiber gratings with various different periods, and the period of the grating cannot be changed again. Secondly, other researchers also make a great deal of magnetic fluid filling-based gratings, such as a magnetic field vector measuring instrument (patent number: CN102411131A) based on magnetic fluid filling-based inclined microstructure fiber gratings, in the method, a magnetic sensitive material is injected into a grating of a photonic crystal fiber containing an air hole to form a probe, and the probe is placed in a magnetic field, so that the change of the magnetic field can cause the change of a spectrum, and the effect of measuring the magnetic field is achieved.
Disclosure of the invention
The invention aims to solve the technical problem of improving the prior art and providing a fiber filter with a dual-period magnetic field regulation function.
A fiber filter regulated by a double-period magnetic field comprises an input fiber 1, a hole-assisted fiber 2 and an output fiber 3, wherein the input fiber 1 mainly comprises a fiber core 101 and a cladding 102, the output fiber 3 comprises a fiber core 301 and a cladding 302, and the hole-assisted fiber 2 mainly comprises a fiber core 201, a cladding 202 and an air hole 203. The air hole 203 utilizes a micro injection pump to respectively and orthogonally inject liquid containing magnetic nano particles and nonmagnetic liquid into the hole-assisted optical fibers with four holes to form two optical fiber gratings 4 with different refractive indexes, so that the modulation of incident light by the hole-assisted optical fibers is realized, meanwhile, the refractive index of magnetic fluid in the hole-assisted optical fibers can be changed through an external magnetic field, the refractive index of the nonmagnetic liquid is not influenced, and the effect of modulating the refractive index of the optical fiber gratings is achieved.
The optical fiber filter of claim 1, wherein the grating is formed in an air hole in the cladding of the optical fiber, and the period of the optical fiber grating is controlled by the ratio of liquid to air in the air hole.
Further, the optical fiber filter for regulating and controlling the bicycle magnetic field is characterized in that the shape of the micropores in the hole-assisted optical fiber can be circular or elliptical and is not limited to the two shapes.
Furthermore, the optical fiber filter with the dual-period magnetic field regulation and control function is characterized in that the liquid in the air hole in the hole-assisted optical fiber must contain liquid of magnetic nanoparticles and liquid of non-magnetic nanoparticles.
Furthermore, the optical fiber filter regulated by the double-period magnetic field is characterized in that the grating can simultaneously filter light with different wave bands.
Furthermore, the optical fiber filter regulated by the bicycle magnetic field is characterized in that the grating has a larger band-stop filtering range.
Furthermore, the optical fiber filter regulated by the bicycle magnetic field is characterized in that the number of the air holes in the hole-assisted optical fiber inner cladding is 4, and the air holes are distributed orthogonally.
Preferably, the input optical fiber 1 and the output optical fiber 3 are common single mode optical fibers
Preferably, the hole-assisted fiber used in the present invention comprises four air holes for preparing the fiber grating.
Preferably, the magnetic fluid is a ferrofluid which becomes a very strong magnetic liquid under the action of an external magnetic field, and the ferrofluid is a novel functional material which has magnetism and fluidity. Ferrofluids are colloidal solutions of nanoscale ferromagnets or ferrimagnetics, with particles suspended in a carrier solution, usually an organic solvent or water. The nanoparticles are completely encapsulated by the surfactant to prevent aggregation, and the ferrofluid typically does not remain magnetic in the absence of an applied magnetic field.
Due to refractive index n of magnetic fluidMFWhen the ambient temperature is T, the functional expression under the action of the external magnetic field strength H is as follows:
in the formula, HcnIs a threshold value; n is0The refractive index of the magnetic fluid under the condition of no magnetic field; n issThe refractive index of the magnetic fluid system tends to be a 'saturated' value after the external magnetic field is increased to a certain degree.
Preferably, the tuning means may employ a magnet to adjust the period of the magnetic fluid within the bore-assisted optical fibre.
Preferably, the magnetic field tuning device may also employ a helmholtz solenoid.
Further, the strength of the magnetic field can be expressed by the following formula
B＝μ0NI
Wherein B is a magnetic field, μ0Is the vacuum permeability, N is the number of coils per unit length, and I is the current.
Compared with the prior art, the invention has the advantages that:
the period of the optical fiber filter regulated by the double-period magnetic field is regulated by an external magnetic field.
The optical fiber filter for regulating the double-period magnetic field can filter light with different wavelengths simultaneously.
According to the optical fiber filter regulated and controlled by the double-period magnetic field, the shape and the number of the air holes have certain influence on the movement of the resonance peak of the grating.
The optical fiber filter regulated and controlled by the double-period magnetic field has a wider filter stop band.
(IV) description of the drawings
Fig. 1 is a schematic structural diagram of a fiber filter with a dual-period magnetic field regulation.
FIG. 2 is a diagram of an apparatus for manufacturing a bi-periodic magnetic field modulated fiber filter.
FIG. 3 is a schematic structural diagram of the structure of the magnet for controlling the refractive index in the cladding of the novel fiber grating.
Fig. 4 is a schematic view of the refractive index distribution of the optical fiber filter under the change of the magnetic field strength.
FIG. 5 is another type of micro-holey fiber: (a) comprises two groups of round micropores with different sizes; (b) contains four micropores with the same size; (c) contains four elliptical micropores with the same size; (d) contains two round micropores with the same size and two oval micropores with the same size. .
FIG. 6 is a refractive index profile in the radial direction of the end of the hole assist fiber.
(V) detailed description of the preferred embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1 and 2 (including air pump, magnet/solenoid), the embodiment of the present invention is composed of an input fiber 1, a hole-assisted fiber 2 and an output fiber 3, wherein the input fiber 1 mainly comprises a core 101 and a cladding 102, the output fiber 3 comprises a core 301 and a cladding 302, and the hole-assisted fiber 2 mainly comprises a core 201, a cladding 202 and an air hole 203. The air holes 203 are formed by periodically injecting magnetic fluid and air inwards by using a micro pump to form the fiber grating 4 consisting of two mediums with different refractive indexes of magnetic fluid and air.
The invention is further illustrated below with reference to specific examples. The invention is further illustrated below with reference to specific examples.
Step 1, preparing an optical fiber filter: firstly, a section of optical fiber containing four air holes is taken, a coreless optical fiber is used for sealing the hole-assisted optical fiber by welding, then two air holes are punched by femtosecond laser, and then air and ferrofluid are respectively injected into other two air holes in the hole-assisted optical fiber by an inflator pump 16 (externally connected with a polytetrafluoroethylene tube 13) and a micro injector 9 (externally connected with a polytetrafluoroethylene tube 14) through a capillary tube 10 connected with the hole-assisted optical fiber. Then cutting off a section of optical fiber by using an optical fiber cutter to expose the air holes, and injecting ethanol and air into the other two air holes by adopting the method in the same way to form the optical fiber filter regulated and controlled by the double-period magnetic field;
step 2, preparing an optical fiber device: an input optical fiber 1 and an output optical fiber 3 are respectively welded at two ends of an optical fiber filter taking the magnetic fluid and the air column as media (the welding points are arranged at the positions of double arrows), so that the complete optical fiber filter for regulating and controlling the magnetic field is prepared;
step 3, modulating the refractive index of the optical fiber filter: (1) the refractive index of the fiber grating can be modulated by the magnet 20 with different magnetic field intensity or (2) the current intensity and direction of the fiber grating can be changed by electrifying the solenoid or inserting the iron core to change the magnetic field intensity, thereby achieving the effect of modulating the refractive index of the magnetofluid in the fiber filter;
step 4, measuring the spectral line of the optical fiber filter: a broad spectrum light source (BBS) and a spectrometer (OSA) are respectively welded at two ends of the optical fiber filter, the current of the optical fiber filter is changed by the electrified solenoid 16 to change the refractive index of the magnetic fluid, and the transmission spectrum of the magnetic fluid is observed by the spectrometer.
Step 5, sensing application example: the prepared fiber grating device is placed in an environment 22 containing a magnetic field, the magnetic field in the environment 20 can be detected through the peak translation amount of the grating modulation spectrum output by the spectrometer 19, and the magnetic induction intensity sensing is realized.
Claims (6)
1. A fiber filter regulated by a double-period magnetic field comprises an input fiber 1, a hole-assisted fiber 2 and an output fiber 3, wherein the input fiber 1 mainly comprises a fiber core 101 and a cladding 102, the output fiber 3 comprises a fiber core 301 and a cladding 302, and the hole-assisted fiber 2 mainly comprises a fiber core 201, a cladding 202 and an air hole 203. The air holes 203 respectively and orthogonally infuse magnetic liquid and nonmagnetic liquid into the hole-assisted optical fibers with four holes by using a micro injection pump to form two optical fiber gratings 4 with different refractive indexes, so that the modulation of the hole-assisted optical fibers on incident light is realized, and simultaneously, the modulation of the period of the optical fiber gratings can be realized by adjusting the refractive index of magnetic fluid in the hole-assisted optical fibers through an external magnetic field.
2. The optical fiber filter of claim 1, wherein the grating is formed in an air hole in the cladding of the optical fiber, and the period of the optical fiber grating is controlled by the ratio of liquid to air in the air hole.
3. The filter according to claim 1, wherein the shape of the micro-holes in the hole-assisted fiber is circular, elliptical and not limited to the above two shapes.
4. The optical fiber filter of claim 1, wherein the liquid in the air holes of the hole-assisted optical fiber comprises a liquid of magnetic nanoparticles and a liquid of non-magnetic nanoparticles.
5. The fiber filter according to claim 1, wherein the grating filters light of different wavelength bands simultaneously.
6. The optical fiber filter according to claim 1, wherein the number of air holes in the inner cladding of the hole-assisted fiber is 4, and the holes are orthogonally distributed.
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| CN201910845074.8A CN110596816A (en) | 2019-09-07 | 2019-09-07 | Optical fiber filter regulated and controlled by double-period magnetic field |
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| CN201910845074.8A CN110596816A (en) | 2019-09-07 | 2019-09-07 | Optical fiber filter regulated and controlled by double-period magnetic field |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111025458A (en) * | 2019-12-31 | 2020-04-17 | 桂林电子科技大学 | Novel adjustable fiber grating |
| CN111965754A (en) * | 2020-08-17 | 2020-11-20 | 桂林电子科技大学 | Large-range tunable filter of programmable fiber grating based on magnetofluid |
| CN112130249A (en) * | 2020-08-17 | 2020-12-25 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN113325508A (en) * | 2021-05-19 | 2021-08-31 | 哈尔滨工程大学 | Method for manufacturing fiber grating based on photo-polymerization material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520555A (en) * | 2009-04-17 | 2009-09-02 | 南开大学 | Functional material filled micro-structure optical fiber based tunable dual-channel grating filter |
| CN102141691A (en) * | 2011-04-25 | 2011-08-03 | 东北大学 | Magnetic control tunable optical fiber comb filter |
| CN103207465A (en) * | 2012-11-16 | 2013-07-17 | 中国计量学院 | Magnetic control tunable filter based on long-period fiber gating |
| CN103869503A (en) * | 2014-03-19 | 2014-06-18 | 华中科技大学 | Multi-wavelength optical fiber filter |
| CN103969851A (en) * | 2014-05-06 | 2014-08-06 | 天津理工大学 | Magnetic-control tunable filter based on inclined micro-structure fiber Bragg grating |
| CN109839693A (en) * | 2018-12-12 | 2019-06-04 | 桂林电子科技大学 | A kind of periodic structure deformation type fiber bragg grating device |
-
2019
- 2019-09-07 CN CN201910845074.8A patent/CN110596816A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520555A (en) * | 2009-04-17 | 2009-09-02 | 南开大学 | Functional material filled micro-structure optical fiber based tunable dual-channel grating filter |
| CN102141691A (en) * | 2011-04-25 | 2011-08-03 | 东北大学 | Magnetic control tunable optical fiber comb filter |
| CN103207465A (en) * | 2012-11-16 | 2013-07-17 | 中国计量学院 | Magnetic control tunable filter based on long-period fiber gating |
| CN103869503A (en) * | 2014-03-19 | 2014-06-18 | 华中科技大学 | Multi-wavelength optical fiber filter |
| CN103969851A (en) * | 2014-05-06 | 2014-08-06 | 天津理工大学 | Magnetic-control tunable filter based on inclined micro-structure fiber Bragg grating |
| CN109839693A (en) * | 2018-12-12 | 2019-06-04 | 桂林电子科技大学 | A kind of periodic structure deformation type fiber bragg grating device |
Non-Patent Citations (1)
| Title |
|---|
| 郭玉玉等: "2um波段高双折射微结构磁流体光纤特性研究", 《中国激光》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111025458A (en) * | 2019-12-31 | 2020-04-17 | 桂林电子科技大学 | Novel adjustable fiber grating |
| CN111965754A (en) * | 2020-08-17 | 2020-11-20 | 桂林电子科技大学 | Large-range tunable filter of programmable fiber grating based on magnetofluid |
| CN112130249A (en) * | 2020-08-17 | 2020-12-25 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN112130249B (en) * | 2020-08-17 | 2022-04-19 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN111965754B (en) * | 2020-08-17 | 2024-06-04 | 桂林电子科技大学 | Large-range tunable filter of programmable fiber grating based on magnetic fluid |
| CN113325508A (en) * | 2021-05-19 | 2021-08-31 | 哈尔滨工程大学 | Method for manufacturing fiber grating based on photo-polymerization material |
| CN113325508B (en) * | 2021-05-19 | 2022-12-13 | 哈尔滨工程大学 | Method for manufacturing fiber grating based on photo-polymerization material |
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