CN109445022A - Parallel fiber optic grating with low Polarization Dependent Loss and preparation method thereof, device - Google Patents
Parallel fiber optic grating with low Polarization Dependent Loss and preparation method thereof, device Download PDFInfo
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- CN109445022A CN109445022A CN201910007449.3A CN201910007449A CN109445022A CN 109445022 A CN109445022 A CN 109445022A CN 201910007449 A CN201910007449 A CN 201910007449A CN 109445022 A CN109445022 A CN 109445022A
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- 239000000835 fiber Substances 0.000 title claims abstract description 182
- 230000010287 polarization Effects 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 44
- 230000001419 dependent effect Effects 0.000 title claims abstract description 36
- 239000013307 optical fiber Substances 0.000 claims abstract description 114
- 239000007787 solid Substances 0.000 claims abstract description 60
- 238000004458 analytical method Methods 0.000 claims description 17
- 238000001228 spectrum Methods 0.000 claims description 17
- 239000004744 fabric Substances 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 230000003287 optical effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
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Classifications
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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
-
- 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
- G02B6/02147—Point by point fabrication, i.e. grating elements induced one step at a time along the fibre, e.g. by scanning a laser beam, arc discharge scanning
Abstract
The invention discloses a kind of parallel fiber optic gratings with low Polarization Dependent Loss and preparation method thereof, device, the parallel fiber optic grating includes cylindrical solid core optical fiber, and write four fiber bragg gratings made in solid core optical fiber, this four fiber bragg grating parallelly distribute ons are in the side of the cylindrical body formed using the central axis of solid core optical fiber as boning out, and four sections of four fiber bragg gratings on the circular section of cylindrical body, it is the intersection point of two mutually perpendicular diameters and circular section in circular section；Wherein, the modulation direction of two fiber bragg gratings of arbitrary neighborhood differs 90 °, and the modulation direction of any non-conterminous two fiber bragg gratings is identical.The grating length of parallel fiber optic grating provided by the invention is short, and there are four fiber bragg gratings for tool, four fiber bragg gratings are distributed at circular ring shape, therefore parallel fiber optic grating provided by the invention has the characteristics of high spatial resolution, high reflectance, low Polarization Dependent Loss.
Description
Technical field
The present invention relates to field of photoelectric technology, more specifically to a kind of light in parallel with low Polarization Dependent Loss
Fine grating and preparation method thereof, device.
Background technique
Fiber grating is a kind of refractive index generation axial cyclic modulation formation for making fiber core by certain method
Diffraction grating, be a kind of passive filtering device.Due to grating fibers have small in size, splice loss, splice attenuation is small, be compatible with optical fiber entirely,
The advantages that intellectual material can be embedded to, and its resonance wavelength is to the variation ratio of the external environments such as temperature, strain, refractive index, concentration
It is more sensitive, therefore be widely used in fiber optic communication and sensory field.
In recent years, with the development of electronic technology, higher and higher to the requirement of fiber grating, and existing fiber grating has
There are lower spatial resolution, lower reflectivity, higher Polarization Dependent Loss.
Summary of the invention
The main purpose of the present invention is to provide a kind of with the parallel fiber optic grating of low Polarization Dependent Loss and its preparation
Method, apparatus can solve fiber grating in the prior art with low spatial resolution, antiradar reflectivity, the related damage of high polarization
The technical issues of consumption.
To achieve the above object, the present invention provides a kind of parallel fiber optic grating with low Polarization Dependent Loss, this is simultaneously
Connection fiber grating includes cylindrical solid core optical fiber, and writes four fiber bragg gratings made in solid core optical fiber；
Four fiber bragg grating parallelly distribute ons are in the cylindrical body formed using the central axis of solid core optical fiber as boning out
Side, and four sections of four fiber bragg gratings on the circular section of cylindrical body, be in circular section two hang down mutually
The intersection point of straight diameter and circular section；The radius of circular section is preset length；
Wherein, the modulation direction of two fiber bragg gratings of arbitrary neighborhood differs 90 °, and non-conterminous two any
The modulation direction of fiber bragg grating is identical.
Optionally, the screen periods of four fiber bragg gratings are Λ, and the range of grating length is 0.2 millimeter to 0.8
Millimeter.
Optionally, the range of preset length is 1 micron to 4.5 microns.
Further the present invention also provides a kind of preparation facilities of parallel fiber optic grating with low Polarization Dependent Loss,
The preparation facilities includes femto-second laser, laser energy adjuster, shutter device, dichroic prism, CCD camera, object lens, Yi Ji
One electronic rotation fixture, the second electronic rotation fixture, fixture control device and three-dimensional mobile platform；
First electronic rotation fixture, the second electronic rotation fixture are arranged in three-dimensional mobile platform, and the first electronic rotation
Fixture and the second electronic rotation fixture are in same horizontal line, for clamping solid core optical fiber；Fixture control device is respectively with
One electronic rotation fixture, the connection of the second electronic rotation fixture；
The laser that femto-second laser issues is transmitted to dichroic prism by laser energy adjuster, shutter device, through double-colored
Prismatic decomposition obtains first laser and second laser, and first laser is transmitted to CCD camera, and second laser focuses on solid core through object lens
On optical fiber, for parallel fiber optic grating to be made.
Optionally, preparation facilities further includes fiber coupler, light source module, spectra collection analysis module, the first optical fiber,
Two optical fiber, third optical fiber and the 4th optical fiber；
The first end of fiber coupler is connect by the first optical fiber with light source module, and the second end of fiber coupler passes through the
Two optical fiber are connect with the port of spectra collection analysis module, and fiber coupler further includes third end, one end of third optical fiber and the
The connection of three ends, the other end of third optical fiber connects with one end of solid core optical fiber, and the position that third optical fiber and solid core optical fiber connect
It is clamped by the first electronic rotation fixture；One end of 4th optical fiber is connect with the port of spectra collection analysis module, the 4th optical fiber
The other end connects with the other end of solid core optical fiber, and the position that the 4th optical fiber and solid core optical fiber connect is by the second electronic rotation fixture
It clamps；
The laser that light source module issues is incident in parallel fiber optic grating obtained through fiber coupler, and fraction of laser light is incident
To spectra collection and analysis module, another part laser occurs to reflect and by fiber coupler incidence in parallel fiber optic grating
Into spectra collection and analysis module.
Optionally, laser energy adjuster includes Glan prism and Polarization Controller；
Laser is transmitted to shutter device by Glan prism, Polarization Controller；
Glan prism is used to control the energy attenuation of laser, and Polarization Controller is used to control the light polarization of laser.
Further the present invention also provides a kind of preparation method of parallel fiber optic grating with low Polarization Dependent Loss,
Preparation method realizes that preparation method includes: based on preparation facilities as claimed in claim 4
The solid core optical fiber for stripping coat is sandwiched in the first electronic rotation fixture, the second electronic rotation fixture by step 1, is moved
Dynamic three-dimensional mobile platform, so that the central axis of solid core optical fiber is located on the horizontal line where the focus of object lens focusing, note object lens
Focus where position be first position；
Three-dimensional mobile platform is moved up preset length by step 2, opens femto-second laser, and to by the first electronic rotation
Turn fixture to the direction of the second electronic rotation fixture and move horizontally object lens, the laser that femto-second laser issues focuses on coke through object lens
At point, and the first fiber bragg grating of system is write on the first level line on solid core optical fiber, femtosecond is closed after the completion of writing processed
Laser；
Step 3, moving three dimension mobile platform, so that the focus of object lens returns to first position, three-dimensional mobile platform is downward
Mobile preset length, opens femto-second laser, and to the direction water by the first electronic rotation fixture to the second electronic rotation fixture
Translate animal mirror；The laser that femto-second laser issues focuses on focal point through object lens, and the second horizontal line on solid core optical fiber
On write system the second fiber bragg grating, femto-second laser is closed after the completion of writing processed；
Step 4, moving three dimension mobile platform pass through fixture control device control so that the focus of object lens returns to first position
It makes the first electronic rotation fixture, the second electronic rotation fixture and coaxial rotates counterclockwise 90 ° simultaneously；
Three-dimensional mobile platform is moved up preset length by step 5, opens femto-second laser, and to by the first electronic rotation
Turn fixture to the direction of the second electronic rotation fixture and move horizontally object lens, the laser that femto-second laser issues focuses on coke through object lens
At point, third fiber bragg grating processed is write on the third horizontal line on solid core optical fiber, and femtosecond is closed after the completion of writing processed and is swashed
Light device；
Step 6, moving three dimension mobile platform, so that the focus of object lens returns to first position, three-dimensional mobile platform is downward
Mobile preset length, opens femto-second laser, and to the direction water by the first electronic rotation fixture to the second electronic rotation fixture
Animal mirror is translated, the laser that femto-second laser issues focuses on focal point through object lens, on the 4th horizontal line on solid core optical fiber
The 4th fiber bragg grating of system is write, parallel fiber optic grating is made.
Optionally, the first fiber bragg grating, the second fiber bragg grating, third fiber bragg grating and
The screen periods of four fiber bragg gratings are Λ, and grating length range is 0.2 millimeter to 0.8 millimeter.
Optionally, the range of preset length is 1 micron to 4.5 microns.
Beneficial effect
The present invention provides a kind of parallel fiber optic grating with low Polarization Dependent Loss, which includes cylinder
The solid core optical fiber of shape, and four fiber bragg gratings made in solid core optical fiber are write, this four fiber bragg gratings are flat
Row is distributed in the side of the cylindrical body formed using the central axis of solid core optical fiber as boning out, and four fiber bragg gratings exist
Four sections on the circular section of cylindrical body are the intersection point of two mutually perpendicular diameters and circular section in circular section；Circular section
Radius be preset length, wherein the modulation directions of two fiber bragg gratings of arbitrary neighborhood differs 90 °, and it is any not
The modulation direction of two adjacent fiber bragg gratings is identical.It is to be understood that with optical fiber cloth in parallel fiber optic grating
The increase of glug grating quantity, the reflectivity of parallel fiber optic grating will also increase, therefore there are four optical fiber for tool provided by the invention
The parallel fiber optic grating reflectivity with higher of Bragg grating；On the other hand it is to be understood that with parallel fiber optic light
The reflectivity of grid is higher, and Polarization Dependent Loss will be smaller, and when the structural symmetry of grating is more preferable, Polarization Dependent Loss will
It is smaller, therefore, because four fiber bragg gratings in parallel fiber optic grating provided by the invention are distributed at circular ring shape, have
Preferable symmetry；In another aspect, the grating length of parallel fiber optic grating provided by the invention is short, therefore sky also with higher
Between resolution ratio.Parallel fiber optic grating provided by the invention not only has high spatial rate, high reflectance respectively in summary, also has
Lower Polarization Dependent Loss.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those skilled in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the parallel fiber optic grating with low Polarization Dependent Loss provided by the present application；
Fig. 2 is that a kind of preparation facilities structure of the parallel fiber optic grating with low Polarization Dependent Loss provided by the present application is shown
It is intended to；
Fig. 3 is the preparation facilities structure of another parallel fiber optic grating with low Polarization Dependent Loss provided by the present application
Schematic diagram；
Fig. 4 is the preparation method process of another parallel fiber optic grating with low Polarization Dependent Loss provided by the present application
Figure；
Fig. 5 is the structural schematic diagram of another parallel fiber optic grating with low Polarization Dependent Loss provided by the present application；
Fig. 6 is a kind of cross-sectional structure signal of parallel fiber optic grating with low Polarization Dependent Loss provided by the present application
Figure；
Fig. 7 is obtained based on high spatial resolution temperature sensor made from parallel fiber optic grating provided by the present application
Test result.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, and not all embodiments.Based on the embodiments of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
This application provides a kind of parallel fiber optic grating with low Polarization Dependent Loss, which includes circle
Cylindrical solid core optical fiber 1, and write four fiber bragg gratings made in solid core optical fiber, shown in Figure 1, four optical fiber
101 parallelly distribute on of Bragg grating is in the side for taking the central axis 102 of solid core optical fiber as the cylindrical body that boning out is formed, and four
Four sections 103 of the fiber bragg grating 1 on the circular section of cylindrical body are two mutually perpendicular diameters in circular section
With the intersection point of circular section.
It should be noted that the modulation direction of two fiber bragg gratings of arbitrary neighborhood differs 90 °, and any not phase
The modulation direction of two adjacent fiber bragg gratings is identical.
Solid core optical fiber is the normal single mode quartz optical fiber for stripping coat.
It is to be understood that the radius of circular section is preset length, under some examples, the range of the preset length can be with
It is 1 micron to 4.5 microns.
Under other examples, the screen periods of four fiber bragg gratings in solid core optical fiber are Λ, grating length
Range be 0.2 millimeter to 0.8 millimeter.
The parallel fiber optic grating tool that the present embodiment supplies there are four fiber bragg grating, four fiber bragg gratings at
Circular ring shape distribution, therefore parallel fiber optic grating provided by the invention has the characteristics of high reflectance, low Polarization Dependent Loss.In addition
It is to be understood that the grating length of parallel fiber optic grating provided by the invention is short, range is 0.2 millimeter to 0.8 millimeter, therefore
Parallel fiber optic grating provided by the invention also spatial resolution with higher the characteristics of.
Present invention also provides a kind of preparation facilities of parallel fiber optic grating with low Polarization Dependent Loss, referring to fig. 2
Shown, which includes femto-second laser 201, laser energy adjuster 202, shutter device 203, dichroic prism 204,
CCD camera 205, object lens 206 and the first electronic rotation fixture 207, the second electronic rotation fixture 208, fixture control device
209 and three-dimensional mobile platform 210, the connection relationship of each device it is as follows:
First electronic rotation fixture 207, the second electronic rotation fixture 208 are arranged in three-dimensional mobile platform 210, and first
Electronic rotation fixture 207 and the second electronic rotation fixture 208 are in same horizontal line, for clamping solid core optical fiber 1.Fixture control
Device 209 processed is connect with the first electronic rotation fixture 207, the second electronic rotation fixture 208 respectively.
It is as follows that the application also provides each device function that preparation facilities is included:
Femto-second laser 201 is for emitting laser.
The laser that laser energy adjuster 202 is used to emit femto-second laser is adjusted to suitable energy.
Shutter device 203 is used to block the laser of femto-second laser transmitting, is equivalent to photoswitch, and specific Push And Release can be with
It is automatically controlled by program.
Dichroic prism 204 is used for the laser reflection that emits femto-second laser to object lens and CCD camera.
CCD camera 205 is used to acquire the laser reflected in dichroic prism and object lens, and according to laser solid core optical fiber fibre
Real-time micro-image is made in the refractive index of in-core.
Object lens 206 can focus on laser on solid core optical fiber, and fiber bragg grating processed is write on solid core optical fiber.
First electronic rotation fixture 207 and the second electronic rotation fixture 208, the both ends for fixing solid core optical fiber are in water
Horizontal line.
Fixture control device 209 is for issuing rotation control signal, with the first electronic rotation fixture of control 207 and the second electricity
Dynamic rolling clamp 208 is rotated.
Three-dimensional mobile platform 210 can be moved in three-dimensional space.
It is to be understood that the laser that femto-second laser 201 issues is by swashing during preparing parallel fiber optic grating
Light energy adjuster 202, shutter device 203 are transmitted to dichroic prism 204, through dichroic prism 204 light splitting obtain first laser and
Second laser, first laser will be transmitted to CCD camera 205, and second laser focuses on solid core optical fiber 1 through object lens 206, for making
Obtain parallel fiber optic grating.
Under other some examples, for information such as reflectivity, resonance peak positions for understanding parallel fiber optic grating obtained,
The preparation facilities of parallel fiber optic grating provided by the invention further includes fiber coupler 211, light source module 212, spectra collection point
Analyse module 213, the first optical fiber 214, the second optical fiber 215, third optical fiber 216 and the 4th optical fiber 217.
Referring to Fig. 3, the connection relationship of each device are as follows: the first end of fiber coupler 211 passes through the first optical fiber 214 and light
Source module 212 connects, the port that the second end of fiber coupler 211 passes through the second optical fiber 215 and spectra collection analysis module 213
Connection, fiber coupler 211 further includes third end, and one end of third optical fiber 216 is connect with third end, third optical fiber 216 it is another
One end connects with one end of solid core optical fiber 1, and the position that third optical fiber 216 and solid core optical fiber 1 connect is pressed from both sides by the first electronic rotation
Tool 207 is clamped.One end of 4th optical fiber 217 is connect with the port of spectra collection analysis module 213, the 4th optical fiber 217 it is another
End connects with the other end of solid core optical fiber 1, and the position that the 4th optical fiber 217 and solid core optical fiber 1 connect is pressed from both sides by the second electronic rotation
Tool 208 is clamped.
The function of light source module is to provide incident light.
Spectra collection and analysis module are used to acquire and analyze the laser of parallel fiber optic optical grating reflection, write and make the parallel fiber optic
The reflectivity of grating, the information such as resonance peak position.
Fiber coupler can divide the laser that light source module 212 emits to the second optical fiber 215 and from the first optical fiber 214
Three optical fiber 216.
It is to be understood that the laser that light source module 212 issues is incident to through fiber coupler 211 and is made by solid core optical fiber 1
In the parallel fiber optic grating obtained, fraction of laser light is incident to spectra collection and analysis module 213, and another part laser is in parallel fiber optic
Occur to reflect and be incident in spectra collection and analysis module 213 by fiber coupler 211 in grating, spectra collection and analysis
Module 213 can be analyzed based on laser is received, and finally obtain the letter such as reflectivity, resonance peak position of parallel fiber optic grating
Breath.
Referring to Fig. 3, laser energy adjuster 202 includes Glan prism 2021 and Polarization Controller under some examples
2022, under the example, the laser that light source module 212 issues can be transmitted by Glan prism 2021, Polarization Controller 2022
To shutter device 203.
It is to be understood that Glan prism is used to control the energy attenuation of laser, Polarization Controller is for controlling laser
Light polarization.
The parallel fiber optic grating that the preparation facilities of parallel fiber optic grating based on the present embodiment confession is prepared, can have
Four fiber bragg gratings, four fiber bragg gratings are distributed at circular ring shape, therefore the parallel fiber optic grating has height
The characteristics of reflectivity, low Polarization Dependent Loss.
Present invention also provides the preparation method of parallel fiber optic grating, the preparation method is based on above-mentioned parallel fiber optic grating
Preparation facilities is realized.Preferably to introduce the preparation method, the present embodiment is prepared based on preparation facilities shown in Fig. 2, to system
The standby process for obtaining parallel fiber optic grating shown in fig. 5 is introduced, it should be noted that Fig. 6 is parallel fiber optic shown in fig. 5
The cross-sectional structure schematic diagram of grating.
It is to be understood that the preparation facilities that preparation method provided by the present application is based on not only can be for shown in Fig. 2
Preparation facilities, or other preparation facilities, as long as being able to achieve the preparation method provided by the present application.
Referring to fig. 4, preparation method provided in this embodiment includes:
The solid core optical fiber 1 for stripping coat is sandwiched in the first electronic rotation fixture 207, the second electronic rotation fixture by step 1
208, moving three dimension mobile platform 210, so that the central axis 102 (referring to Fig. 5) of solid core optical fiber 1 is located at the focusing of object lens 206
On horizontal line where focus, the position where remembering the focus of object lens is first position 104；
Three-dimensional mobile platform 210 is moved up preset length by step 2, opens femto-second laser 201, and to by first
The direction of 207 to the second electronic rotation fixture 208 of electronic rotation fixture moves horizontally object lens 206, what femto-second laser 201 issued
Laser focuses on focal point through object lens 206, and the first fiber bragg grating of system is write on the first level line on solid core optical fiber 1
1011, femto-second laser 201 is closed after the completion of writing processed.
Step 3, moving three dimension mobile platform 210, so that the focus of object lens 206 returns to first position 104, three-dimensional is mobile
Platform 210 moves down preset length, opens femto-second laser 201, and to electronic by the first electronic rotation fixture 207 to the second
The direction of rolling clamp 208 moves horizontally object lens 206, and the laser that femto-second laser 201 issues focuses on focus through object lens 206
Place, and the second fiber bragg grating 1012 of system is write on the second horizontal line on solid core optical fiber 1, it closes and flies after the completion of writing processed
Second laser 201.
Step 4, moving three dimension mobile platform 210 pass through fixture control so that the focus of object lens 206 returns to first position 104
Device 209 processed controls that the first electronic rotation fixture 207, the second electronic rotation fixture 208 is coaxial simultaneously rotates counterclockwise
90°。
Three-dimensional mobile platform 210 is moved up preset length by step 5, opens femto-second laser 201, and to by first
The direction of 207 to the second electronic rotation fixture 208 of electronic rotation fixture moves horizontally object lens 206, what femto-second laser 201 issued
Laser focuses on focal point through object lens 206, and third fiber bragg grating processed is write on the third horizontal line on solid core optical fiber 1
1013, femto-second laser 201 is closed after the completion of writing processed.
Step 6, moving three dimension mobile platform 210, so that the focus of object lens 206 returns to first position 104, three-dimensional is mobile
Platform 210 moves down preset length, opens femto-second laser 201, and to electronic by the first electronic rotation fixture 207 to the second
The direction of rolling clamp 208 moves horizontally object lens 206, and the laser that femto-second laser 201 issues focuses on focus through object lens 206
Locate, the 4th fiber bragg grating 1014 of system is write on the 4th horizontal line on solid core optical fiber 1, parallel fiber optic grating is made.
It is to be understood that by above-mentioned steps in parallel fiber optic grating obtained, the first fiber bragg grating
1011, the second fiber bragg grating 1012, third fiber bragg grating 1013 and the 4th fiber bragg grating 1014
It is distributed in the different location of silica fibre fibre core.Wherein, the first fiber bragg grating 1011 and the second fiber bragg grating
1012 modulation direction is identical, the modulation direction phase of third fiber bragg grating 1013 and the 4th fiber bragg grating 1014
Together, it can be formed so symmetrical.
It should be noted that the modulation methods of the first fiber bragg grating 1011 and the second fiber bragg grating 1012
To in 90 ° with the modulation direction of third fiber bragg grating 1013 and the 4th fiber bragg grating 1014.
It is to be understood that under some examples, the first fiber bragg grating 1011, the second fiber bragg grating
1012, the screen periods of third fiber bragg grating 1013 and the 4th fiber bragg grating 1014 are Λ, grating length
Range is 0.2 millimeter to 0.8 millimeter.
Under other examples, the range of preset length is 1 micron to 4.5 microns.
Preparation method based on the parallel fiber optic grating that the present embodiment supplies, there are four the parallel fiber optic grating tools being prepared
Fiber bragg grating, four fiber bragg gratings are distributed at circular ring shape, therefore the parallel fiber optic grating has high reflection
The characteristics of rate, low Polarization Dependent Loss.
Compared with prior art, parallel fiber optic grating provided by the present application includes solid core optical fiber and the fibre in solid core optical fiber
Multiple in core are parallel to each other and fiber bragg gratings be spaced apart, same period or different cycles, these optical fiber Bradleys
Between lattice grating have proportional spacing, between can't generate crosstalk, have high reflectance and low Polarization Dependent Loss.
On the other hand, it in the preparation facilities of above-mentioned parallel fiber optic grating provided by the present application, does not need as the prior art one
Sample needs to be made parallel fiber optic grating based on expensive phase mask plate, and can pass through accurate three-dimensional mobile platform control
Parallel fiber optic grating is made in the movement of solid core optical fiber processed under the effect of the laser.
In another aspect, obtained parallel fiber optic grating relatively simple, low in cost using preparation method provided by the invention
High mechanical strength, performance are stablized, while realizing that grating length is short, can obtain higher reflectivity (be greater than 90%) and compared with
Low Polarization Dependent Loss (being less than 1dB), has good using valence in fiber optic communication, Fibre Optical Sensor and optical fiber laser field
Value.
The present invention can apply in following field:
Superelevation space resolution temperature/strain transducer: it can be made based on parallel fiber optic grating proposed by the present invention super
The grating length of high spatial resolution temperature/strain transducer, the senser element is short, and fibre diameter is small, and sub-micron may be implemented
Single-point type sensing.
Multi-wavelength optical fiber laser: multi-wavelength optical-fiber laser can be made based on parallel fiber optic grating proposed by the present invention
Optical-fiber laser can be achieved at the same time due to integrating different fiber bragg grating of multiple periods in parallel fiber optic grating in device
The optical fibre device of device resonant cavity and multi-wavelength selection.
The communication device of low Polarization Dependent Loss: parallel connection integrated optical fiber Bragg grating device proposed by the present invention passes through
The space annular spread for the Bragg grating that inventor proposes, may be implemented under the premise of guaranteeing high reflectance, realize ultralow
Polarization Dependent Loss.
Referring to Fig. 7, Fig. 7 is to be sensed based on high spatial resolution temperature obtained by parallel fiber optic grating provided by the invention
The Polarization Dependent Loss test result of device.Abscissa in figure indicates that wavelength, unit nm, left ordinate scale indicate transmission spectrum damage
Consumption, unit dB, right ordinate scale indicate Polarization Dependent Loss, unit dB.
It can be seen from the figure that corresponding grating resonance peak transmission loss, in -12.49dB, corresponding Polarization Dependent Loss is only
There is 1.18dB.The reflectivity based on high spatial resolution temperature sensor obtained by parallel fiber optic grating can be greater than
95%, meanwhile, Polarization Dependent Loss is lower (1.18dB), greatly improves the measurement accuracy in single point temperature sensor.
It should be noted that for the various method embodiments described above, describing for simplicity, therefore, it is stated as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because
According to the present invention, certain steps can use other sequences or carry out simultaneously.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, and related actions and modules might not all be this hair
Necessary to bright.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments, meanwhile, the serial number of the above embodiments of the invention is only for description, does not represent
The superiority and inferiority of embodiment, those skilled in the art under the inspiration of the present invention, are not departing from present inventive concept and right is wanted
It asks under protected ambit, can also make many forms, all of these belong to the protection of the present invention.
Claims (9)
1. a kind of parallel fiber optic grating with low Polarization Dependent Loss, which is characterized in that the parallel fiber optic grating includes circle
Cylindrical solid core optical fiber, and write four fiber bragg gratings made in the solid core optical fiber；
Four fiber bragg grating parallelly distribute ons are in the circle formed using the central axis of the solid core optical fiber as boning out
The side of cylinder, and four sections of four fiber bragg gratings on the circular section of the cylindrical body are the circle
The intersection point of two mutually perpendicular diameters and the circular section in section；The radius of the circular section is preset length；
Wherein, the modulation direction of two fiber bragg gratings of arbitrary neighborhood differs 90 °, and non-conterminous two any
The modulation direction of the fiber bragg grating is identical.
2. parallel fiber optic grating as described in claim 1, which is characterized in that the grating week of four fiber bragg gratings
Phase is Λ, and the range of grating length is 0.2 millimeter to 0.8 millimeter.
3. parallel fiber optic grating as claimed in claim 1 or 2, which is characterized in that the range of the preset length be 1 micron extremely
4.5 micron.
4. a kind of preparation facilities of the parallel fiber optic grating with low Polarization Dependent Loss, which is characterized in that the preparation facilities
Including femto-second laser, laser energy adjuster, shutter device, dichroic prism, CCD camera, object lens and the first electronic rotation
Fixture, the second electronic rotation fixture, fixture control device and three-dimensional mobile platform；
The first electronic rotation fixture, the second electronic rotation fixture are arranged in the three-dimensional mobile platform, and described first
Electronic rotation fixture and the second electronic rotation fixture are in same horizontal line, for clamping solid core optical fiber；The fixture
Control device is connect with the first electronic rotation fixture, the second electronic rotation fixture respectively；
The laser that the femto-second laser issues is transmitted to the double-colored rib by the laser energy adjuster, shutter device
Mirror is divided to obtain first laser and second laser through the dichroic prism, and the first laser is transmitted to the CCD camera, institute
It states second laser to focus on the solid core optical fiber through the object lens, for parallel fiber optic grating to be made.
5. preparation facilities as claimed in claim 4, which is characterized in that the preparation facilities further includes fiber coupler, light source
Module, spectra collection analysis module, the first optical fiber, the second optical fiber, third optical fiber and the 4th optical fiber；
The first end of the fiber coupler is connect by first optical fiber with the light source module, the fiber coupler
Second end is connect by second optical fiber with the port of the spectra collection analysis module, and the fiber coupler further includes
Three ends, one end of the third optical fiber are connect with the third end, the other end of the third optical fiber and the solid core optical fiber
One end connects, and the position that the third optical fiber and the solid core optical fiber connect is clamped by the first electronic rotation fixture；Institute
The one end for stating the 4th optical fiber is connect with the port of the spectra collection analysis module, the other end of the 4th optical fiber and the reality
The other end of core fibre connects, and the position that the 4th optical fiber and the solid core optical fiber connect is pressed from both sides by second electronic rotation
Tool is clamped；
The laser that the light source module issues is incident in the parallel fiber optic grating obtained through the fiber coupler, part
To the spectra collection and analysis module, laser described in another part occurs the laser light incident in the parallel fiber optic grating
It reflects and passes through the fiber coupler and be incident in the spectra collection and analysis module.
6. preparation facilities as described in claim 4 or 5, which is characterized in that the laser energy adjuster includes Glan prism
And Polarization Controller；
The laser is transmitted to the shutter device by the Glan prism, the Polarization Controller；
The Glan prism is used to control the energy attenuation of the laser, and the Polarization Controller is used to control the light of the laser
Beam polarization state.
7. a kind of preparation method of the parallel fiber optic grating with low Polarization Dependent Loss, which is characterized in that the preparation method
It is realized based on preparation facilities as claimed in claim 4, the preparation method includes:
The solid core optical fiber for stripping coat is sandwiched in the first electronic rotation fixture, second electronic rotation folder by step 1
Tool, the mobile three-dimensional mobile platform, so that the central axis of the solid core optical fiber is located at where the focus of object lens focusing
Horizontal line on, remember that the position where the focus of the object lens is first position；
The three-dimensional mobile platform is moved up preset length by step 2, opens the femto-second laser, and to by described
The direction of one electronic rotation fixture to the second electronic rotation fixture moves horizontally the object lens, and the femto-second laser issues
Laser focus on focal point through the object lens, and write on the first level line on the solid core optical fiber the first optical fiber Bradley of system
Lattice grating closes the femto-second laser after the completion of writing processed；
Step 3, the mobile three-dimensional mobile platform, so that the focus of the object lens returns to the first position, by the three-dimensional
Mobile platform moves down the preset length, opens the femto-second laser, and to by the first electronic rotation fixture extremely
The direction of the second electronic rotation fixture moves horizontally the object lens；The laser that the femto-second laser issues is through the object lens
Focal point is focused on, and writes the second fiber bragg grating of system on the second horizontal line on the solid core optical fiber, has been made writing
The femto-second laser is closed at rear；
Step 4, the mobile three-dimensional mobile platform pass through the folder so that the focus of the object lens returns to the first position
Tool control device controls that the first electronic rotation fixture, the second electronic rotation fixture are coaxial simultaneously to be rotated counterclockwise
90°；
The three-dimensional mobile platform is moved up the preset length by step 5, opens the femto-second laser, and to by institute
The direction for stating the first electronic rotation fixture to the second electronic rotation fixture moves horizontally the object lens, the femto-second laser
The laser of sending focuses on focal point through the object lens, and third optical fiber cloth processed is write on the third horizontal line on the solid core optical fiber
Glug grating closes the femto-second laser after the completion of writing processed；
Step 6, the mobile three-dimensional mobile platform, so that the focus of the object lens returns to the first position, by the three-dimensional
Mobile platform moves down the preset length, opens the femto-second laser, and to by the first electronic rotation fixture extremely
The direction of the second electronic rotation fixture moves horizontally the object lens, and the laser that the femto-second laser issues is through the object lens
Focal point is focused on, the 4th fiber bragg grating of system is write on the 4th horizontal line on the solid core optical fiber, parallel connection light is made
Fine grating.
8. preparation method as claimed in claim 7, which is characterized in that first fiber bragg grating, the second optical fiber cloth
The screen periods of glug grating, third fiber bragg grating and the 4th fiber bragg grating are Λ, grating length range
It is 0.2 millimeter to 0.8 millimeter.
9. preparation method as claimed in claim 7 or 8, which is characterized in that the range of the preset length is 1 micron to 4.5
Micron.
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