CN110412689A - A kind of chirp spectral pattern is without chamber optical fiber fp filter and preparation method thereof - Google Patents
A kind of chirp spectral pattern is without chamber optical fiber fp filter and preparation method thereof Download PDFInfo
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- CN110412689A CN110412689A CN201910670859.6A CN201910670859A CN110412689A CN 110412689 A CN110412689 A CN 110412689A CN 201910670859 A CN201910670859 A CN 201910670859A CN 110412689 A CN110412689 A CN 110412689A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29358—Multiple beam interferometer external to a light guide, e.g. Fabry-Pérot, etalon, VIPA plate, OTDL plate, continuous interferometer, parallel plate resonator
- G02B6/29359—Cavity formed by light guide ends, e.g. fibre Fabry Pérot [FFP]
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
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Abstract
The invention discloses a kind of chirp spectral patterns without chamber optical fiber fp filter, which is characterized in that including multimode micro-nano fiber covering, multimode micro-nano fiber fibre core, Bragg grating；The multimode micro-nano fiber covering is outermost layer, the micro-nano area of radius gradual change is transitioned into from the homogeneity range of constant-radius along the section of axis, then arrive the homogeneity range of constant-radius；The multimode micro-nano fiber fibre core is inner layer, it is covered by multimode micro-nano fiber covering, multimode micro-nano fiber fibre core is transitioned into from the homogeneity range of constant-radius the micro-nano area of radius gradual change along the section of axis, the homogeneity range of constant-radius is arrived again, the Bragg grating is the Bragg grating in the periods such as continuous inscription, covers the micro-nano area of whole multimode micro-nano fiber fibre cores；No cell method Bripello optical filter proposed by the present invention can realize the chirp spectral pattern of Free Spectral Range variation in larger wave-length coverage, and have biggish chirp change rate, while having compact structure, and be easy to make.
Description
Technical field
The present invention relates to the research field of optical device, in particular to a kind of chirp spectral pattern is filtered without chamber optical fiber Fabry Perot
Wave device and preparation method thereof.
Background technique
The multiple wavelengths filter of chirp spectral pattern is a kind of multi-wavelength device of non-homogeneous wavelength interval, is typically used to chirp
The fields such as signal generation, such as in pulse compression technique, with the light of mapping techniques when frequency and the optical filter of chirp spectral pattern
Shaping technique is composed, the microwave pulse signal of frequency sweep can be obtained.
In order to realize the optical fiber for reforming filtering device of chirp spectral pattern, feasible scheme is the optical fiber Bradley for cascading different bandwidth
The interference-type optical fiber device of lattice grating and phase special designing.For cascading the fiber bragg grating of different bandwidth, due to
Its screen periods and modulation depth are variations, therefore it is very big to inscribe difficulty.For the interference-type optical fiber of phase special designing
Device, a kind of common method are to form Mach using two fiber couplers to increase Dare interferometers, and an arm passes through wherein
Circulator, which joined one section of chirped fiber grating, realizes the Mach increasing Dare interferometer of chirp spectral pattern, but such method obtains
Interferometer, cannot achieve biggish Free Spectral Range, simultaneously because the presence of long optical fibers and circulator, stability can be by
To the influence of environment.Therefore a kind of light for the chirp spectral pattern that structure is simple, Free Spectral Range is big and stability is high is needed at present
Fiber filter.Different from Mach increasing Dare interferometer type structure, fabry perot interferometer has more compact structure.Optical fiber
Fabry perot interferometer is a kind of common multi-wavelength spectrum filtering device, is widely used in sensing measurement, biology doctor
Study picture, the fields such as supersonic sounding and optical fiber laser.But traditional fiber positioning unit is solid due to chamber length
Fixed, so its Free Spectral Range is uniformly, to can not achieve the characteristic of chirp spectral pattern.
Micro-nano fiber is a kind of novel optical fibre device, and a variety of optical fibre devices, such as micro-nano may be implemented using micro-nano fiber
Fiber bragg grating, micro-nano fiber interferometer and micro-nano long-period fiber grating etc..Micro-nano fiber has many unique property
Matter, wherein a critically important characteristic is that its effective refractive index can change with the variation of fibre diameter, when diameter is less than 5 microns
When, effective refractive index can occur sharply to decline.If carrying out inscription cloth using the phase mask of uniform period on micro-nano fiber
The central wavelength of glug grating, obtained grating can be with common grating different from；If using uniform in an area Duan Zhui
The phase mask in period carries out inscription Bragg grating, will obtain the chirp grating of one section of wide range.If in micro-nano fiber
The left and right area Liang Duanzhui inscribes two sections of gratings respectively, then meeting roundtrip is between the chirp grating in the area Liang Duanzhui to occur mostly light
Beam interferometer process will form a kind of fiber positioning unit for having certain chamber long.There is micro-nano fiber grating for such
The fabry perot interferometer of formation, since different wavelength corresponds to the different location in cone area, locating for different wave length
Chamber length is variation, can cause Free Spectral Range that certain variation occurs, and it is certain to have fabry perot interferometer
Chirp spectral pattern.
But there are problems that will lead to two due to alveolus.Firstly, since effective refractive index is with diameter in the area Liang Duanzhui
Variation be not very big, therefore the chirp rate of interference spectrum is not very high.Additionally, due to the chirp grating for being scribed at the area Liang Duanzhui
It does not ensure that full symmetric, therefore its wave-length coverage can be prevented from fitting like a glove, therefore for chirp interference spectrum, In
Short wavelength regions have certain phase mismatch, can destroy the chirping characteristics of interference spectrum in this way, so that occurring one section without interference region
Domain or the reversed region of chirping characteristics, this will affect its application effect.
Summary of the invention
The shortcomings that it is a primary object of the present invention to overcome the prior art and insufficient, provides a kind of chirp spectral pattern without chamber optical fiber
Fp filter.
Another object of the present invention is to provide a kind of chirp spectral patterns without chamber optical fiber fp filter production method.
The main object of the present invention is realized by the following technical solution:
A kind of chirp spectral pattern is without chamber optical fiber fp filter, which is characterized in that including multimode micro-nano fiber covering,
Multimode micro-nano fiber fibre core, Bragg grating；The multimode micro-nano fiber covering is outermost layer, and the section along axis is from radius
Constant homogeneity range is transitioned into the micro-nano area of radius gradual change, then arrives the homogeneity range of constant-radius；The multimode micro-nano fiber fibre core
For inner layer, covered by multimode micro-nano fiber covering, multimode micro-nano fiber fibre core along axis section from the homogeneity range of constant-radius
It is transitioned into the micro-nano area of radius gradual change, then arrives the homogeneity range of constant-radius, the Bragg grating is the periods such as continuous inscription
Bragg grating covers the micro-nano area of whole multimode micro-nano fiber fibre cores.
Further, the multimode micro-nano fiber fibre core is made up of fused biconical taper, symmetric about the axis.
Further, the multimode micro-nano fiber fibre core uses material for quartzy doped germanium.
Further, the multimode micro-nano fiber covering uses material for quartz.
Further, the Bragg grating is refractive index modulation type grating.
Further, the grating region modulation depth of the Bragg grating changes with multimode micro-nano fiber fibre core outer diameter and carries out
It adjusts, the region gentle for multimode micro-nano fiber fibre core outer diameter curvilinear motion, modulation depth suitably weakens；It is micro- for multimode
The violent region of nano fiber fibre core outer diameter curvilinear motion, modulation depth are suitably reinforced.
A kind of chirp spectral pattern is without chamber optical fiber fp filter production method, which comprises the following steps:
Fused biconical taper is carried out to micro-nano fiber, the micro-nano fiber of melting after a certain period of time is stretched；
It is inscribed, phase mask plate is placed on micro-nano fiber appropriate location, is exported by ultraviolet pulse laser, together
When control inscribe electric control displacement platform drive lens group moved；
It is scanned, lens group is passed through in the output of ultraviolet pulse laser, and focal beam spot scans in the horizontal direction and incidence
Onto phase mask plate, the first-order diffraction striped of diffraction pattern is scanned micro-nano fiber and applies periodic refractive index
Modulation, to form grating；Diffraction fringe scanning to micro-nano fiber most fine positioning is set when, left side reflected light grid region is formed, spectrum shape
Shape is flat broadband band logical spectral pattern；When diffraction fringe cross micro-nano fiber most fine positioning set continue to scan on when, the light of right area
Grid initially form, and spectrally show with multiple beam reflected light path is formed before the reflected light grid region of the left side to form interference
There is interference spectral pattern for short wavelength regions, and Long wavelength region is also flat spectral pattern；Diffraction fringe continues to scan on, and spectrally shows
Gradually become to interfere spectral pattern from flat for Long wavelength region, finally all forms interference fringe in all reflecting regions, obtain chirp
Spectral pattern is without chamber optical fiber fp filter.
Further, described to be stretched as speed change movement.
Further, the scanning moves horizontally for speed change.
Further, it in scribing process, is scanned according to the speed of setting, the region gentle for diameter change adds
Fast scan speed；The region violent for diameter change slows down scanning speed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1, the present invention can realize the chirp spectral pattern of Free Spectral Range variation in larger wave-length coverage, and have biggish
Chirp change rate.
2, the present invention is to provide no chamber optical fiber Fabry interferometer, on shortwave boundary, there is no phase mismatch situations.
Detailed description of the invention
Fig. 1 is a kind of structure chart of the chirp spectral pattern without chamber optical fiber fp filter of the present invention；
Fig. 2 is the producing device structure chart of filter in embodiment of the present invention；
Fig. 3 is the reflectance spectrum figure of filter in embodiment of the present invention.
In figure, 1- multimode micro-nano fiber covering, 2- multimode micro-nano fiber fibre core, 3- Bragg grating, 4- flame thrower,
The left fixture of 5-, the right fixture of 6-, 7- Zola cone electric control displacement platform, the right drawing cone electric control displacement platform of 8-, 9- ultraviolet pulse laser,
10- lens group, 11- inscribe automatically controlled mobile platform, 12- phase mask plate.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment:
A kind of chirp spectral pattern is without chamber optical fiber fp filter, the multimode micro-nano fiber covering 1 including fused biconical taper,
3 three parts of Bragg grating in multimode micro-nano fiber fibre core 2 and the equal periods continuously inscribed.It is continuous in micro-nano transition region
After a long grating is inscribed in scanning, although chamber is not long in the structure formed, since optical fiber micro-nano area can be by most fine positioning
Two parts in left and right are regarded at the center of being set to as, and the grating inscribed thereon can also control two parts, to a certain of the grating left side
The small grating segment of diameter centainly has the small grating segment an of same diameter on the right, and the reflection wavelength of the two is consistent,
Meet this wave-length coverage optical frequency component can between the two small grating segments roundtrip and to ultimately form multiple beam dry
It relates to.The similarly small grating segment area on the inside of above-mentioned small grating segment, also will form multiple-beam interference；Above-mentioned small
Small grating segment area on the outside of grating segment, also will form multiple-beam interference, all can shape finally inside entire grating region
At multiple-beam interference, and interference strength is by phase decision, and phase relation is equal to the distance between symmetrical small grating segment
It is determined divided by the coupling optical wavelength of small grating segment, while the distance of this small grating segment meets function with its outer diameter again and closes
System.By calculate it is found that the wavelength-phase relation thus generated be it is nonlinear, eventually lead to interference periods chirp variation.
Compared to the fiber positioning unit for having chamber, no chamber fiber positioning unit shortwave boundary not
There can be phase mismatch situation, because shortwave boundary wavelength one is scheduled on the appearance of micro-nano midpoint, because of effective refraction herein
Rate is minimum, and the wavelength of the grating of inscription is also minimum, and tie point of the midpoint as the two micro-nano grating regions in left and right, wavelength
It is shared by the two micro-nano transition regions in left and right, therefore wave-length coverage exactly matches.Additionally, due to the presence of half-wave loss, in shortwave
The phase at place's (be located at micro-nano fiber midpoint) is π, therefore be coherent subtraction situation, meets gently roll-offing for chirp filter
Feature.And due to the effective refractive index near midpoint with diameter variation clearly, keep the chirp of interference spectrum more preferable.
As shown in Figure 1, a kind of chirp spectral pattern is without chamber optical fiber fp filter, as shown in Figure 1, comprising:
Multimode micro-nano fiber covering 1, the section shape along axis are transitioned into radius gradual change from the homogeneity range of constant-radius
Micro-nano area, then arrive constant-radius homogeneity range；
Multimode micro-nano fiber fibre core 2, the section shape along axis are transitioned into radius gradual change from the homogeneity range of constant-radius
Micro-nano area, then arrive constant-radius homogeneity range；
The Bragg grating 3 in the equal periods continuously inscribed, continuous writing area cover whole multimode micro-nano fiber fibre cores
Micro-nano area.
Wherein the main material of the multimode micro-nano fiber covering 1 is quartz, and the parameters such as refractive index meet common quotient
With the covering parameter of communication multimode fibre；Its micro-nano area realizes by fused biconical taper method, inside and outside diameter with axis variation relation by
Fused biconical taper process is voluntarily realized, cone speed can be drawn to influence its inside and outside diametal curve design parameter by control.
Wherein the main material of the multimode micro-nano fiber fibre core 2 is quartzy doped germanium, and the parameters such as refractive index meet
The core parameters of general commercial communication multimode fibre；Its micro-nano area and the micro-nano area of fibre cladding are formed simultaneously, and outer diameter is with axis
Line variation relation is voluntarily realized by fused biconical taper process, cone speed can be drawn to influence its curve design parameter by control.
Wherein the Bragg grating 3 in the described equal periods continuously inscribed is refractive index modulation type grating, grating inscription area
Domain need to cover whole micro-nano areas, halfway cannot whether there is or not the common micro-nano fiber areas that periodic refractive index is modulated, i.e., without traditional light
Alveolus included in nanofarads FP interferometers；The modulation depth of grating region need to be adjusted with fibre core outer diameter change curve
Section, region its modulation depth gentle for fibre core outer diameter curvilinear motion suitably weakens, violent for fibre core outer diameter curvilinear motion
Its modulation depth of region suitably reinforce.
Without chamber optical fiber fp filter production method, producing device and step include: for a kind of chirp spectral pattern
Commercial multimode fibre is fixed by fixture, melts multimode micro-nano fiber using flame thrower；
The electric control displacement platform where fixture is controlled, fixture displacement is driven, optical fiber is drawn under the action of fixture and bores, draw
Procedure regulation flame flow and stepper motor speed are bored to control the inside and outside diametal curve of micro-nano fiber covering；
Start ultraviolet pulse laser, for changing the refractive index of optical fiber；
Ultraviolet pulse light is input to lens group, changes optical path direction, and carry out light focusing；
The light of lens group output is incident in the phase mask version with uniform period, generates diffraction fringe；
The electric control displacement platform where lens group is controlled, drive lens group displacement makes ultraviolet laser after phase mask
Diffraction pattern along shaft axis of optic fibre direction carry out variable-speed scanning.
It is specific as follows:
A kind of production method of the embodiment of the present invention, producing device and material are as shown in Figure 2, comprising: multimode micro-nano light
Fine covering 1, multimode micro-nano fiber fibre core 2 continue the Bragg grating 3 (on the way in the way of inscription) in the equal periods inscribed, are used for
Melt the flame thrower 4 of multimode fibre, left fixture 5, right fixture 6, Zola's cone electric control displacement platform 7, the automatically controlled displacement of right drawing cone
Platform 8, ultraviolet pulse laser 9, lens group 10 inscribe electric control displacement platform 11, phase mask plate 12.
It is micro-nano fiber fused biconical taper step first, commercial multimode fibre left and right fixture 5,6 is fixed, opens fire
Flame injector 4 melts optical fiber；Left and right fixture 5,6 bores electric control displacement platform in Zola respectively after being molten to the regular hour
7, both direction is stretched to the left and right under 8 drive, and the movement of electric control displacement platform 7,8 is mobile for speed change, passes through control speed
Configuration file is spent, different micro-nano fiber shapes may be implemented；When the most thin diameter of micro-nano fiber reaches requirement, flame is closed,
Electric control displacement platform 7,8 stops movement simultaneously.
Followed by step is inscribed, phase mask plate 12 is placed on appropriate location after optical fiber, opens ultraviolet pulse laser
9, start simultaneously at control inscribe 11 drive lens group 10 of electric control displacement platform carry out speed change move horizontally, pulse laser 9 it is defeated
Horizontal direction can be prolonged by the focal beam spot after lens group 10 out to scan and be incident on phase mask plate 12, diffraction pattern
First-order diffraction striped micro-nano fiber can be scanned and apply periodic refractive index modulation, to form grating.Spread out
Penetrate strip-scanning to optical fiber most fine positioning is set when, left side reflected light grid region is formed, spectral shape be flat broadband band logical spectral pattern；When
Diffraction fringe is crossed optical fiber most fine positioning and is set when continuing to scan on, and the grating of right area initially forms, and with before the grating region of the left side
Multiple beam reflected light path is formed, to form interference, short wavelength regions is spectrally shown as and occurs interfering spectral pattern, and Long wavelength region
Also it is flat spectral pattern；Diffraction fringe continues to scan on, and is spectrally shown as Long wavelength region and gradually becomes to interfere spectral pattern from flat,
Interference fringe is finally all formed in all reflecting regions, chirp spectral pattern has made without chamber optical fiber fp filter
At.
Originally it applies in example, the most thin diameter of multimode micro-nano fiber is 4.2 μm；The wavelength of ultraviolet pulse laser 3 is 193 nanometers,
Repetition rate 200Hz peak power 3mJ；The period of phase mask 12 is 1067nm.In scribing process, according to the speed of setting
It being scanned, scanning speed is accelerated in the region gentle for diameter change, and weaken its modulation depth suitably, and make reflectivity not
As for excessively high；The region violent for diameter change slows down scanning speed, and its modulation depth is made suitably to reinforce and make reflectivity
It is unlikely to too low, so that the reflectivity of the wavelength in grating is kept flat, final effect is to make each interference peaks of filter
Reflectivity is roughly equal.
Fig. 3 is the reflectance spectrum figure without chamber optical fiber fp filter for the chirp spectral pattern that the present embodiment obtains, can
With discovery, wave-length coverage is greater than 25nm, there is 63 peaks in wave-length coverage；The chirping characteristics of spectrum are good, can significantly see
The FSR that shortwave goes out out is sent to, and the FSR at long wave is smaller；The reflectivity of interference peaks fluctuates very little, in addition to having at 1557.5nm
One loss envelope.
It should be noted that the most thin diameter parameters of multimode micro-nano fiber are not limited to apply 4.2 in example 1 in the present invention
μm, the multimode micro-nano fiber of other diameters all can serve as the carrier of filter；Ultraviolet laser in the present invention is not intended to limit
Apply specific repetition rate 200Hz and peak power 3mJ in example 1；The period of phase mask is not intended to limit specifically in the present invention
1067nm。
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of chirp spectral pattern is without chamber optical fiber fp filter, which is characterized in that including multimode micro-nano fiber covering, more
Mould micro-nano fiber fibre core, Bragg grating；The multimode micro-nano fiber covering is outermost layer, and the section along axis is permanent from radius
Fixed homogeneity range is transitioned into the micro-nano area of radius gradual change, then arrives the homogeneity range of constant-radius；The multimode micro-nano fiber fibre core is
Inner layer is covered by multimode micro-nano fiber covering, multimode micro-nano fiber fibre core along axis section from the homogeneity range mistake of constant-radius
The micro-nano area to radius gradual change is crossed, then arrives the homogeneity range of constant-radius, the Bragg grating is the cloth in the periods such as continuous inscription
Glug grating covers the micro-nano area of whole multimode micro-nano fiber fibre cores.
2. a kind of chirp spectral pattern according to claim 1 is without chamber optical fiber fp filter, which is characterized in that described
Multimode micro-nano fiber fibre core is made up of fused biconical taper, symmetric about the axis.
3. a kind of chirp spectral pattern according to claim 1 is without chamber optical fiber fp filter, which is characterized in that described
Multimode micro-nano fiber fibre core uses material for quartzy doped germanium.
4. a kind of chirp spectral pattern according to claim 1 is without chamber optical fiber fp filter, which is characterized in that described
Multimode micro-nano fiber covering uses material for quartz.
5. a kind of chirp spectral pattern according to claim 1 is without chamber optical fiber fp filter, which is characterized in that described
Bragg grating is refractive index modulation type grating.
6. a kind of chirp spectral pattern according to claim 5 is without chamber optical fiber fp filter, which is characterized in that described
The grating region modulation depth of Bragg grating is adjusted with the variation of multimode micro-nano fiber fibre core outer diameter, for multimode micro-nano fiber
The gentle region of fibre core outer diameter curvilinear motion, modulation depth suitably weaken；Diametal curve outside multimode micro-nano fiber fibre core is become
Change violent region, modulation depth is suitably reinforced.
7. a kind of chirp spectral pattern is without chamber optical fiber fp filter production method, which comprises the following steps:
Fused biconical taper is carried out to micro-nano fiber, the micro-nano fiber of melting after a certain period of time is stretched；
It is inscribed, phase mask plate is placed on micro-nano fiber appropriate location, is exported by ultraviolet pulse laser, same to time control
System is inscribed electric control displacement platform drive lens group and is moved；
It is scanned, lens group is passed through in the output of ultraviolet pulse laser, and focal beam spot scans in the horizontal direction and is incident on phase
On the mask plate of position, the first-order diffraction striped of diffraction pattern is scanned micro-nano fiber and applies periodic refractive index tune
System, to form grating；Diffraction fringe scanning to micro-nano fiber most fine positioning is set when, left side reflected light grid region is formed, spectral shape
For flat broadband band logical spectral pattern；When diffraction fringe cross micro-nano fiber most fine positioning set continue to scan on when, the grating of right area
It initially forms, and is spectrally shown as with multiple beam reflected light path is formed before the reflected light grid region of the left side to form interference
There is interference spectral pattern in short wavelength regions, and Long wavelength region is also flat spectral pattern；Diffraction fringe continues to scan on, and is spectrally shown as
Long wavelength region gradually becomes to interfere spectral pattern from flat, finally all forms interference fringe in all reflecting regions, obtains chirp spectrum
Type is without chamber optical fiber fp filter.
8. a kind of chirp spectral pattern according to claim 7 is without chamber optical fiber fp filter production method, feature
It is, it is described to be stretched as speed change movement.
9. a kind of chirp spectral pattern according to claim 7 is without chamber optical fiber fp filter production method, feature
It is, the scanning moves horizontally for speed change.
10. a kind of chirp spectral pattern according to claim 7 is without chamber optical fiber fp filter production method, feature
It is, in scribing process, is scanned according to the speed of setting, scanning speed is accelerated in the region gentle for diameter change；
The region violent for diameter change slows down scanning speed.
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| CN111007154A (en) * | 2019-12-02 | 2020-04-14 | 暨南大学 | Flexible ultrasonic transducer, manufacturing method and all-optical ultrasonic emission and detection method |
| CN111007154B (en) * | 2019-12-02 | 2022-10-18 | 暨南大学 | Flexible ultrasonic transducer, manufacturing method and all-optical ultrasonic emission and detection method |
| CN111562646A (en) * | 2020-05-29 | 2020-08-21 | 南京邮电大学 | Method for manufacturing non-uniform Bragg fiber grating and structure thereof |
| CN115128729A (en) * | 2022-06-17 | 2022-09-30 | 暨南大学 | Ultrasonic sensor preparation method and device and ultrasonic sensor |
| CN115128729B (en) * | 2022-06-17 | 2023-08-25 | 暨南大学 | Preparation method and device of ultrasonic sensor and ultrasonic sensor |
| CN115683185A (en) * | 2022-10-28 | 2023-02-03 | 南京邮电大学 | Design method of symmetrical biconical phase-shift fiber bragg grating and sensor system |
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