CN111221070A - Device and method for manufacturing fiber grating - Google Patents
Device and method for manufacturing fiber grating Download PDFInfo
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- CN111221070A CN111221070A CN202010071695.8A CN202010071695A CN111221070A CN 111221070 A CN111221070 A CN 111221070A CN 202010071695 A CN202010071695 A CN 202010071695A CN 111221070 A CN111221070 A CN 111221070A
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- fiber
- photosensitive
- liquid
- phase mask
- fiber grating
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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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02133—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference
- G02B6/02138—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference based on illuminating a phase mask
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention relates to the technical field of fiber grating manufacturing, and discloses a device and a method for manufacturing a fiber grating, wherein the device for manufacturing the fiber grating comprises the following steps: the optical path immersion tool comprises a hollow body, liquid with a preset refractive index is filled in the body, two channels which are symmetrically arranged and used for the photosensitive optical fiber to pass through are arranged on the body, and a coating stripping window which is coaxially arranged with the channels is arranged in the body; the phase mask plate is arranged in the body, so that the photosensitive optical fiber is made into a fiber grating. The device and the method for manufacturing the fiber grating provided by the invention completely immerse the phase mask plate and the photosensitive fiber into the modulated liquid, convert the non-ultraviolet coherent light beam into the deep ultraviolet coherent light beam, simultaneously generate light and shade alternate stripes through the action of the phase mask plate, form corresponding periodic refractive index modulation on the fiber core of the photosensitive fiber, and finally realize the purpose of manufacturing the fiber grating.
Description
Technical Field
The invention relates to the technical field of fiber grating manufacturing, in particular to a device and a method for manufacturing a fiber grating.
Background
The fiber grating is a phase grating which is formed by writing a light and shade pattern of incident light into a fiber core by using the photosensitivity of a fiber material through an ultraviolet light exposure method and generating a periodic distribution of refractive indexes along the axial direction of the fiber core in the fiber core, and the phase grating is used for forming a permanent space and is used for forming a narrow-band filter or a reflector in the fiber core. When one beam of broad spectrum light passes through the fiber grating, the light with the wavelength meeting the fiber grating Bragg condition is reflected, and the light with the other wavelengths is transmitted continuously through the fiber grating.
Because of the limitation of the photosensitive wavelength of the optical fiber, the writing laser light source is required to be a coherent light source of deep ultraviolet, the most central and most expensive equipment in the manufacturing method of the whole fiber grating is a coherent laser which needs frequency doubling and even high repetition frequency, the common realization method is to use a solid YAG laser to carry out multiple frequency doubling and sum frequency to form the deep ultraviolet laser with the wavelength near 248nm and even lower wavelength, the power loss in the frequency doubling process is serious, the expensive crystal in the frequency doubling process is easy to damage and needs to be replaced, and the platform maintenance cost is very high.
Disclosure of Invention
The embodiment of the invention provides a device and a method for manufacturing a fiber grating, which are used for solving or partially solving the problems of serious power loss and easy damage of crystals in the process of forming deep ultraviolet laser by using a solid YAG laser to carry out multiple frequency doubling and sum frequency.
In a first aspect, an embodiment of the present invention provides an apparatus for manufacturing a fiber grating, including: the optical path immersion tool comprises a hollow body, liquid with a preset refractive index is filled in the body, two channels which are symmetrically arranged and used for photosensitive optical fibers to pass through are arranged on the body, and a coating stripping window which is coaxial with the channels is arranged in the body; the phase mask plate is arranged in the body, so that the photosensitive optical fiber is made into an optical fiber grating.
On the basis of the scheme, the photosensitive optical fiber and the front surface of the phase mask plate are arranged in parallel.
On the basis of the scheme, the device for manufacturing the fiber bragg grating further comprises two fiber holders, and the two fiber holders are respectively located on two sides of the optical path immersion tool.
On the basis of the scheme, the light path immersion tool further comprises a sealing bottom cover which is arranged on the outer wall of the body and used for sealing the two channels.
On the basis of the scheme, the light path immersion tool further comprises a waste liquid collecting disc used for collecting liquid leaked from the inside of the body.
On the basis of the scheme, the body is made of plastic.
On the basis of the scheme, the body comprises an accommodating cavity with an open top and a cover body matched with the accommodating cavity.
In a second aspect, an embodiment of the present invention provides a method for manufacturing a fiber grating, including:
modulating liquid with preset refractive index, and arranging the photosensitive optical fiber through the body;
filling the liquid into the body until the phase mask plate and the photosensitive optical fiber are completely immersed in the liquid;
the incident coherent light beams form +/-1-level light beams after passing through the phase mask plate, the +/-1-level light beams interact to form light and dark alternate stripes, and the photosensitive optical fibers are exposed under the light and dark alternate stripes to form the fiber bragg grating.
The device and the method for manufacturing the fiber grating provided by the embodiment of the invention firstly modulate liquid with preset refractive index according to parameters of incident light, the photosensitive optical fiber penetrates through two channels on the body and then penetrates through the body to be arranged, at the moment, the photosensitive optical fiber is required to be in a completely straightened state, a section of coating on the photosensitive optical fiber corresponding to the phase mask plate is completely removed, a coating stripping window is formed, and the modulated liquid is filled into the body until the phase mask plate and the photosensitive optical fiber are completely immersed in the liquid; the incident coherent light beams form +/-1-level light beams after passing through the phase mask plate, the +/-1-level light beams interact to form light and dark alternate stripes, and the photosensitive optical fibers are exposed under the light and dark alternate stripes to form the fiber bragg grating. According to the device for manufacturing the fiber grating, the phase mask plate and the photosensitive fiber are completely immersed in the modulated liquid, so that the original non-ultraviolet coherent light beam is converted into the deep ultraviolet coherent light beam, and meanwhile, the light and dark alternate stripes are generated under the action of the phase mask plate to form corresponding periodic refractive index modulation on the fiber core of the photosensitive fiber, and finally, the purpose of manufacturing the fiber grating is achieved; the scheme of selecting a frequency doubling solid laser and a high repetition frequency solid laser in common designs can be replaced, and the purchase and maintenance cost of core equipment in the common scheme is reduced; the liquid immersion can also take away heat in the laser exposure process to accelerate the formation of the fiber grating, because the excessive heat can prevent and slow down the formation speed of the refractive index periodic modulation; meanwhile, by using the liquid immersion type, the core equipment does not need to carry out high repetition frequency to form the deep ultraviolet laser, and the crystal and the lens in the core equipment can be protected, because the optical crystal and the lens are quite fast to be worn under the irradiation effect of the deep ultraviolet laser, the maintenance cost of replacing the lens by the laser equipment in the common scheme can be reduced.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a top view of an apparatus for fabricating a fiber grating according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a periodic refractive index modulation writing to a photosensitive fiber according to an embodiment of the present invention;
FIG. 3 is a side view of an apparatus for fabricating a fiber grating according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a waste liquid collecting tray according to an embodiment of the present invention;
FIG. 5 is a flowchart of a method for fabricating a fiber grating according to an embodiment of the present invention.
Reference numerals:
100. a photosensitive optical fiber; 101. coating stripping window; 200. an optical path immersion tool; 201. a liquid inlet; 202. a liquid outlet; 203. sealing the bottom cover; 300. a liquid; 400. a phase mask plate; 500. a waste liquid collection tray; 501. a waste liquid outlet; 600. an optical fiber holder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The problem of high platform maintenance cost caused by the adoption of the solid YAG laser can be well solved by using a liquid immersion method. For example, using a YAG laser with a wavelength of 1064nm, obtaining 355nm coherent blue light through frequency tripled, and then inputting the blue light into pure water to output 266nm ultraviolet output (the wavelength of the incident light is divided by the effective refractive index of the pure water). Therefore, the coherent laser does not need to carry out quadruple frequency or even higher sum frequency, and the manufacturing difficulty and the purchasing and maintenance cost of the equipment are reduced.
It should be noted that the core of the phase mask method for manufacturing the fiber grating is related parameters for reasonably designing the phase mask plate, the exposure processing is performed after the phase mask plate is designed, and the fiber grating can be written in by building a light path according to the phase mask plate after the exposure processing is completed. As shown in FIG. 2, the incident coherent laser firstly enters the liquid, and then irradiates the incident surface of the phase mask plate to form a +/-1-level light beam, the 0-level light is effectively suppressed, the +/-1-level light beam interacts with each other to form a light and dark alternate stripe light beam, the photosensitive fiber is placed in the light and dark stripe for exposure, and the corresponding axial periodic refractive index modulation, namely the formation of the fiber grating, can be written in the fiber core.
Fig. 1 is a top view of an apparatus for manufacturing a fiber grating according to an embodiment of the present invention, and as shown in fig. 1, the apparatus for manufacturing a fiber grating according to an embodiment of the present invention includes: the optical path immersion tool 200, wherein the optical path immersion tool 200 comprises a hollow body, and the body can be made of plastics; the body comprises an accommodating cavity with an open top and a cover body matched with the accommodating cavity, and the inside of the body is filled with liquid 300, namely the accommodating cavity is used for filling the liquid 300; the body is provided with two symmetrically arranged channels for the photosensitive optical fiber 100 to pass through, the channels can be of a circular structure, namely, one side wall of the accommodating cavity is provided with one channel, the other opposite side wall of the accommodating cavity is provided with the other channel, and the central lines of the two channels are arranged in a superposition way; a coating stripping window 101 which is coaxial with the channel is arranged in the body, and the coating layer at the corresponding position of the photosensitive optical fiber 100 is completely removed, namely the coating stripping window 101 is formed; a phase mask plate 400 is arranged in the body so that the photosensitive fiber 100 can be made into a fiber grating; the phase mask plate 400 may be suspended inside the accommodating cavity.
It should be noted that the refractive index of the liquid 300 can be designed accordingly, so as to change the coherent laser light source of non-deep ultraviolet to the coherent laser light source of deep ultraviolet. When the coherent laser passes through the liquid, the wavelength of the coherent laser is correspondingly changed, and the changed wavelength is the optimal photosensitive wavelength by designing the refractive index of the liquid, so that the writing of the fiber grating is effectively carried out.
In the embodiment of the invention, firstly, the liquid 300 with the preset refractive index is modulated according to the parameters of the incident light, the photosensitive fiber 100 penetrates through the body after passing through the two channels on the body, at this time, the photosensitive fiber 100 is required to be in a completely straightened state, a section of coating on the photosensitive fiber 100 corresponding to the phase mask 400 is completely removed to form a coating stripping window 101, and the modulated liquid 300 is filled into the body until the phase mask 400 and the photosensitive fiber 100 are completely immersed in the liquid 300; the incident coherent light beam forms a +/-1-level light beam after passing through the phase mask plate 400, the +/-1-level light beam interacts with each other to form light and dark alternate stripes, and the photosensitive fiber 100 is exposed under the light and dark alternate stripes to form the fiber grating. According to the device for manufacturing the fiber grating, provided by the embodiment of the invention, the phase mask plate 400 and the photosensitive fiber 100 are completely immersed in the modulated liquid 300, so that the original non-ultraviolet coherent light beam is converted into the deep ultraviolet coherent light beam, and meanwhile, light and dark alternate stripes are generated under the action of the phase mask plate 400, so that corresponding periodic refractive index modulation is formed on the fiber core of the photosensitive fiber 100, and the purpose of manufacturing the fiber grating is finally realized; the scheme of selecting a frequency doubling solid laser and a high repetition frequency solid laser in common designs can be replaced, and the purchase and maintenance cost of core equipment in the common scheme is reduced; the liquid immersion can also take away the heat in the laser exposure process to accelerate the formation of the fiber grating, because the excessive heat can prevent the formation speed of the periodic modulation of the refractive index from being slowed down; after the optical path immersion type is used, the suitable wavelength of the writing laser can be selected according to the refractive index of the design immersion liquid, so that the limitation of type selection of the writing laser can be avoided, the expensive purchasing cost of core equipment is reduced, the crystal lens in the laser does not need to continuously work under the condition of deep ultraviolet, and the damage frequency of the crystal lens in the laser can be greatly reduced.
On the basis of the above embodiment, the coating stripping window 101 is disposed inside the body, the length of the coating stripping window 101 is greater than that of the phase mask 400, and the projection of the front surface of the phase mask 400 on the body passes through the coating stripping window 101.
The front surface of the phase mask 400 is a surface having grooves, and the back surface of the phase mask 400 is a flat surface.
In the embodiment of the present invention, the front surface of the phase mask 400 faces the bottom of the accommodating cavity, the back surface of the phase mask 400 faces the bottom of the cover, and the front surface of the phase mask 400 is parallel to the bottom of the accommodating cavity. The projection of the photosensitive fiber 100 in the vertical direction is located on the front surface of the phase mask 400. The projection of the front surface of the phase mask 400 on the bottom of the accommodating cavity passes through the coating stripping window 101, i.e. the distance between the left end of the coating stripping window 101 and the right end of the coating stripping window 101 is greater than the length of the phase mask 400.
On the basis of the above-described embodiment, as shown in fig. 3, the photosensitive fibers 100 are arranged in parallel with the front surface of the phase mask 400.
In the embodiment of the present invention, when there are multiple photosensitive fibers 100, the planes of the multiple photosensitive fibers 100 are parallel to the front surface of the phase mask 400. The front surface of the phase mask 400 is located directly above the photosensitive fiber 100.
On the basis of the above embodiment, the apparatus for manufacturing a fiber grating further includes two fiber holders 600, and the two fiber holders 600 are respectively located at two sides of the optical path immersion tool 200.
In the embodiment of the present invention, one fiber holder 600 is used to hold one end of the photosensitive optical fiber 100, and the other fiber holder 600 is used to hold the other end of the photosensitive optical fiber 100. The photosensitive fiber 100 can be in a straight state by the action of the fiber holder 600, and the photosensitive fiber 100 is parallel to the front surface of the phase mask 400.
On the basis of the above embodiment, the optical path immersion tool 200 further includes a sealing bottom cover 203 mounted on the outer wall of the body for sealing the two channels.
In the embodiment of the present invention, the sealing bottom cover 203 may have a U-shaped structure, one end of the sealing bottom cover 203 is disposed corresponding to one channel, the other end of the sealing bottom cover 203 is disposed corresponding to another channel, and both ends of the sealing bottom cover 203 are provided with through holes for the photosensitive fibers 100 to pass through.
On the basis of the above-described embodiment, as shown in fig. 4, the optical path immersion tool 200 further includes a waste liquid collection pan 500 for collecting the liquid 300 leaked from the inside of the body.
In the embodiment of the present invention, the waste liquid collecting tray 500 is disposed outside the sealing bottom cover 203, and the waste liquid outlet 501 is disposed on the waste liquid collecting tray 500.
On the basis of the above embodiment, the body is provided with a liquid inlet 201 and a liquid outlet 202.
In the embodiment of the present invention, the liquid 300 with the modulated preset refractive index is filled into the body through the liquid inlet 201, and after the fiber grating is manufactured, the liquid 300 can be taken out through the liquid outlet 202.
On the basis of the above embodiments, as shown in fig. 5, the method for manufacturing a fiber grating according to the present invention includes:
s100, modulating liquid with a preset refractive index, wherein the photosensitive optical fiber penetrates through the body;
s200, filling liquid into the body until the phase mask plate and the photosensitive optical fiber are completely immersed in the liquid;
s300, the incident coherent light beams form +/-1-level light beams after passing through the phase mask plate, the +/-1-level light beams interact to form light and dark alternate stripes, and the photosensitive optical fibers are exposed under the light and dark alternate stripes to form the fiber bragg grating.
In the embodiment of the invention, firstly, the liquid 300 with the preset refractive index is modulated according to the parameters of the incident light, the photosensitive fiber 100 penetrates through the body after passing through the two channels on the body, at this time, the photosensitive fiber 100 is required to be in a completely straightened state, a section of coating on the photosensitive fiber 100 corresponding to the phase mask 400 is completely removed to form a coating stripping window 101, and the modulated liquid 300 is filled into the body until the phase mask 400 and the photosensitive fiber 100 are completely immersed in the liquid 300; the incident coherent light beam forms a +/-1-level light beam after passing through the phase mask plate 400, the +/-1-level light beam interacts with each other to form light and dark alternate stripes, and the photosensitive fiber 100 is exposed under the light and dark alternate stripes to form the fiber grating. According to the method for manufacturing the fiber grating, provided by the embodiment of the invention, the phase mask plate and the photosensitive fiber are subjected to liquid immersion type writing, the wavelength of writing coherent laser is changed, the requirement of photosensitive exposure wavelength of the photosensitive fiber is met, light and dark alternate stripes are formed by adopting a phase mask method to write in the grating with the periodic modulation of the refractive index, meanwhile, the liquid immersion type takes away redundant heat to accelerate the implementation of the writing process, and finally, the writing of the fiber grating is well realized; the method for manufacturing the fiber grating can be applied to the fields of communication fiber gratings and high-power fiber gratings, and has simple and reasonable structure and strong universality; after the optical path immersion type is used, the suitable wavelength of the writing laser can be selected according to the refractive index of the design immersion liquid, so that the limitation of type selection of the writing laser can be avoided, the expensive purchasing cost of core equipment is reduced, the crystal lens in the laser does not need to continuously work under the condition of deep ultraviolet, and the damage frequency of the crystal lens in the laser can be greatly reduced.
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 (8)
1. An apparatus for fabricating a fiber grating, comprising: the optical path immersion tool comprises a hollow body, liquid with a preset refractive index is filled in the body, two channels which are symmetrically arranged and used for photosensitive optical fibers to pass through are arranged on the body, and a coating stripping window which is coaxial with the channels is arranged in the body; the phase mask plate is arranged in the body, so that the photosensitive optical fiber is made into an optical fiber grating.
2. The apparatus according to claim 1, wherein the photosensitive fiber is disposed parallel to the front surface of the phase mask.
3. The apparatus according to claim 1, further comprising two fiber holders respectively disposed at two sides of the optical path immersion tool.
4. The apparatus of claim 1, wherein the optical path immersion tool further comprises a sealing bottom cover mounted on an outer wall of the body for sealing the two channels.
5. The apparatus of claim 1, wherein the optical path immersion tool further comprises a waste liquid collecting tray for collecting liquid leaked from the inside of the body.
6. The apparatus according to claim 1, wherein the body is made of plastic.
7. The apparatus according to claim 1, wherein the body comprises a cavity with an open top and a cover body adapted to the cavity.
8. A method for fabricating a fiber grating according to any one of claims 1 to 7, comprising:
modulating liquid with preset refractive index, and arranging the photosensitive optical fiber through the body;
filling the liquid into the body until the phase mask plate and the photosensitive optical fiber are completely immersed in the liquid;
the incident coherent light beams form +/-1-level light beams after passing through the phase mask plate, the +/-1-level light beams interact to form light and dark alternate stripes, and the photosensitive optical fibers are exposed under the light and dark alternate stripes to form the fiber bragg grating.
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| CN202010071695.8A CN111221070A (en) | 2020-01-21 | 2020-01-21 | Device and method for manufacturing fiber grating |
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| CN202010071695.8A CN111221070A (en) | 2020-01-21 | 2020-01-21 | Device and method for manufacturing fiber grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900176A (en) * | 2021-12-10 | 2022-01-07 | 之江实验室 | Immersed multi-core fiber grating inscribing device |
| CN114236673A (en) * | 2021-12-22 | 2022-03-25 | 长飞（武汉）光***股份有限公司 | Integrated fiber grating inscribing system |
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| US20140233888A1 (en) * | 2013-02-21 | 2014-08-21 | Ofs Fitel, Llc | Index matched grating inscription |
| CN107526131A (en) * | 2017-09-08 | 2017-12-29 | 深圳大学 | A kind of device for preparing Fiber Bragg Grating FBG and preparation method thereof |
| CN207198375U (en) * | 2017-09-08 | 2018-04-06 | 深圳大学 | A kind of device for preparing Fiber Bragg Grating FBG |
| CN211698270U (en) * | 2020-01-21 | 2020-10-16 | 武汉锐科光纤激光技术股份有限公司 | Device for manufacturing optical fiber grating |
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| CN102540323A (en) * | 2012-01-18 | 2012-07-04 | 武汉理工大学 | Fiber bragg grating manufacture device based on parallelepiped prism and application thereof |
| US20140232997A1 (en) * | 2013-02-21 | 2014-08-21 | Ofs Fitel, Llc | Index matched grating inscription |
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| CN113900176A (en) * | 2021-12-10 | 2022-01-07 | 之江实验室 | Immersed multi-core fiber grating inscribing device |
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| CN114236673A (en) * | 2021-12-22 | 2022-03-25 | 长飞（武汉）光***股份有限公司 | Integrated fiber grating inscribing system |
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Application publication date: 20200602 |