CN209265001U - A kind of parallel fiber optic grating and its preparation facilities with low Polarization Dependent Loss - Google Patents
A kind of parallel fiber optic grating and its preparation facilities with low Polarization Dependent Loss Download PDFInfo
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- CN209265001U CN209265001U CN201920024331.7U CN201920024331U CN209265001U CN 209265001 U CN209265001 U CN 209265001U CN 201920024331 U CN201920024331 U CN 201920024331U CN 209265001 U CN209265001 U CN 209265001U
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Abstract
The utility model discloses a kind of parallel fiber optic gratings and its preparation facilities with low Polarization Dependent Loss, 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 utility model 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 utility model has the characteristics of high spatial resolution, high reflectance, low Polarization Dependent Loss.
Description
Technical field
The utility model relates to field of photoelectric technology, more specifically to a kind of with low Polarization Dependent Loss and
Join fiber grating and its preparation facilities.
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.
Utility model content
The main purpose of the utility model is to provide a kind of parallel fiber optic grating with low Polarization Dependent Loss and its
Preparation facilities can solve fiber grating in the prior art with low spatial resolution, antiradar reflectivity, high Polarization Dependent Loss
The technical issues of.
To achieve the above object, the utility model provides a kind of parallel fiber optic grating with low Polarization Dependent Loss,
The parallel fiber optic 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 utility model additionally provides a kind of preparation of parallel fiber optic grating with low Polarization Dependent Loss
Device, the preparation facilities include 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；
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.
Beneficial effect
The utility model provides a kind of parallel fiber optic grating with low Polarization Dependent Loss, which includes
Cylindrical solid core optical fiber, and write four fiber bragg gratings made in solid core optical fiber, this four optical fiber Bragg light
Grid parallelly distribute on is in the side of the cylindrical body formed using the central axis of solid core optical fiber as boning out, and four optical fiber Bragg light
Four sections of the grid on the circular section of cylindrical body are the intersection point of two mutually perpendicular diameters and circular section in circular section；Circle
The radius in section is preset length, wherein the modulation direction of two fiber bragg gratings of arbitrary neighborhood differs 90 °, and appoints
Anticipate non-conterminous two fiber bragg gratings modulation direction it is identical.It is to be understood that with light in parallel fiber optic grating
The increase of fine Bragg grating quantity, the reflectivity of parallel fiber optic grating will also increase, therefore provided by the utility model have
The parallel fiber optic grating reflectivity with higher of four fiber bragg gratings；On the other hand it is to be understood that with simultaneously
The reflectivity for joining fiber grating is higher, and Polarization Dependent Loss will be smaller, and when the structural symmetry of grating is more preferable, polarize phase
Closing loss will be smaller, therefore, because four fiber bragg grating Cheng Yuan in parallel fiber optic grating provided by the utility model
Annular spread has preferable symmetry in another aspect, the grating length of parallel fiber optic grating provided by the invention is short, therefore goes back
Spatial resolution with higher.Parallel fiber optic grating provided by the invention not only has high spatial rate, height respectively in summary
Reflectivity also has lower Polarization Dependent Loss.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those skilled in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
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 a kind of preparation facilities structural schematic diagram for preparing parallel fiber optic grating provided by the present application；
Fig. 3 is the preparation facilities structural schematic diagram that another kind provided by the present application prepares parallel fiber optic grating；
Fig. 4 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. 5 is obtained based on high spatial resolution temperature sensor made from parallel fiber optic grating provided by the present application
Test result.
Specific embodiment
It, below will knot to enable the purpose of utility model, feature, advantage of the utility model more obvious and understandable
The attached drawing in the utility model embodiment is closed, the technical scheme in the utility model embodiment is clearly and completely described,
Obviously, the described embodiments are only a part of the embodiments of the utility model, and not all embodiments.Based on the utility model
In embodiment, those skilled in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
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 Fig. 4 is the cross-sectional structure schematic diagram of parallel fiber optic grating shown in FIG. 1.
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 utility model has the characteristics of high reflectance, low Polarization Dependent Loss.
It additionally needing and is appreciated that, the grating length of parallel fiber optic grating provided by the invention is short, and 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 utility model further includes that fiber coupler 211, light source module 212, spectrum are adopted
Set analysis 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.
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.It is prepared based on preparation facilities provided by the present application
The method of parallel fiber optic grating is relatively simple, low in cost, and parallel fiber optic grating high mechanical strength obtained, performance are stablized,
While realizing that grating length is short, higher reflectivity (being greater than 90%) can be obtained and lower Polarization Dependent Loss (is less than
1dB), there is good application value in fiber optic communication, Fibre Optical Sensor and optical fiber laser field.
The utility model can be applied in following field:
Superelevation space resolution temperature/strain transducer: based on the utility model proposes parallel fiber optic grating can make
At superelevation space resolution temperature/strain transducer, the grating length of the senser element is short, and fibre diameter is small, and Asia may be implemented
Micron single-point type sensing.
Multi-wavelength optical fiber laser: based on the utility model proposes parallel fiber optic grating can be made multi-wavelength optical fiber swash
Light device can be achieved at the same time optical fiber and swash due to integrating different fiber bragg grating of multiple periods in parallel fiber optic grating
The optical fibre device of light device resonant cavity and multi-wavelength selection.
The communication device of low Polarization Dependent Loss: the utility model proposes integrated optical fiber Bragg grating device in parallel,
By the space annular spread for the Bragg grating that utility model people proposes, may be implemented under the premise of guaranteeing high reflectance,
Realize ultralow Polarization Dependent Loss.
Referring to Fig. 5, Fig. 5 is based on high spatial resolution temperature obtained by parallel fiber optic grating provided by the utility model
The Polarization Dependent Loss test result of sensor.Abscissa in figure indicates that wavelength, unit nm, left ordinate scale indicate transmission
Spectrum loss, 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 utility model is not limited by the described action sequence,
Because certain steps can use other sequences or carry out simultaneously according to the utility model.Secondly, those skilled in the art
It should be aware of, the embodiments described in the specification are all preferred embodiments, and related actions and modules might not be all
It is necessary to the utility model.
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, above-mentioned the utility model embodiment serial number is for illustration only, no
The superiority and inferiority of embodiment is represented, those skilled in the art are not departing from the utility model under the enlightenment of the utility model
In the case of objective and scope of the claimed protection, many forms can be also made, these belong to the protection of the utility model
Within.
Claims (6)
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920024331.7U CN209265001U (en) | 2019-01-04 | 2019-01-04 | A kind of parallel fiber optic grating and its preparation facilities with low Polarization Dependent Loss |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920024331.7U CN209265001U (en) | 2019-01-04 | 2019-01-04 | A kind of parallel fiber optic grating and its preparation facilities with low Polarization Dependent Loss |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445022A (en) * | 2019-01-04 | 2019-03-08 | 深圳大学 | Parallel fiber optic grating with low Polarization Dependent Loss and preparation method thereof, device |
| CN115327694A (en) * | 2022-03-31 | 2022-11-11 | 西北工业大学 | Clamping device for multi-core fiber Bragg grating laser direct writing |
-
2019
- 2019-01-04 CN CN201920024331.7U patent/CN209265001U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445022A (en) * | 2019-01-04 | 2019-03-08 | 深圳大学 | Parallel fiber optic grating with low Polarization Dependent Loss and preparation method thereof, device |
| CN115327694A (en) * | 2022-03-31 | 2022-11-11 | 西北工业大学 | Clamping device for multi-core fiber Bragg grating laser direct writing |
| CN115327694B (en) * | 2022-03-31 | 2024-03-15 | 西北工业大学 | Clamping device for multi-core fiber Bragg grating laser direct writing |
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