CN103605179A - Fiber bragg grating device with adjustable phase shifting and manufacturing method thereof - Google Patents
Fiber bragg grating device with adjustable phase shifting and manufacturing method thereof Download PDFInfo
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- CN103605179A CN103605179A CN201310566016.4A CN201310566016A CN103605179A CN 103605179 A CN103605179 A CN 103605179A CN 201310566016 A CN201310566016 A CN 201310566016A CN 103605179 A CN103605179 A CN 103605179A
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Abstract
The invention, which is suitable for the field of the grating technology, provides a fiber bragg grating device with adjustable phase shifting. The fiber bragg grating device comprises a fiber core and a cladding layer. A fiber bragg grating is formed at the fiber core. A cavity filled with fluid mediums is arranged at the fiber core; the fiber bragg grating is divided into two parts by the cavity; and the cavity has a channel communicated with the external world. In addition, a manufacturing method for a fiber bragg grating device with adjustable phase shifting is also provided. According to the fiber bragg grating device, linear adjustment of a phase shifting value can be realized easily; and long-term stability of the phase shifting value can be maintained. Meanwhile, the manufacturing method is simple; and the phase shifting value can be controlled accurately without the need of configuration of an expensive high-precision electrically-controlled displacement device.
Description
Technical field
The invention belongs to grating technology field, relate in particular to adjustable Fiber Bragg Grating FBG device of a kind of phase shift and preparation method thereof.
Background technology
In prior art there is variety of issue in phase-shifted fiber grating device, such as: phase-shift phase device non-adjustable, that use is expensive, the big or small Fiber Bragg Grating FBG that is difficult to accurately control, produces of phase-shift phase is unstable etc.Below enumerate the method for several frequently seen generation Fiber Bragg Grating FBG.
Phase shift phase mask plate method: Ultra-Violet Laser forms by the phase shift phase mask plate of specific customization the interference fringe that contains phase shift composition, thus on optical fiber, directly inscribe phase shift optical fiber Bragg grating.The shortcoming of this method is the phase shifting mask plate that needs specific customization costliness, and phase-shift phase size is unadjustable.
Horizontal holographic double exposure: first the phase mask plate by uniform period exposes for the first time to optical fiber, afterwards by changing laser wavelength of incidence, moving fiber front and back position or optical fiber being applied to strain, optical fiber is exposed for the second time, it is slightly different that twice processing obtains the grating cycle, thereby form phase shift mechanism.The shortcoming of this method is the size that is difficult to accurately control the phase-shift phase of introducing.
Moving fiber method: the index distribution that changes fiber grating by the method for moving fiber or phase mask plate, the shortcoming of this method is higher to the accuracy requirement of the hardware controls mechanism of manufacturing system, also will have perfect, complicated software program system to guarantee simultaneously.
Laser post treatment method: the phase mask plate by uniform period writes after grating, a bit of grating is wherein irradiated again with Ultra-Violet Laser or carbon dioxide laser, the refractive index of this part optical fiber is further changed, until form required phase-shift phase.The shortcoming of this method is that laser aftertreatment has not only changed the phase place between two sections of gratings, and causes the increase of local effective refractive index, thereby causes the resonance wavelength red shift of whole grating.
External disturbance modulation method: by being exerted pressure or heated in the part of uniform period fiber grating, thereby obtain phase-shifted fiber grating.The shortcoming of this method is when external disturbance disappears, and phase shift mechanism also can disappear.
Therefore, there is defect in prior art, needs to improve.
Summary of the invention
The Fiber Bragg Grating FBG device that provides a kind of phase shift adjustable is provided technical matters to be solved by this invention, is intended to solve the unstable and uncontrollable problem of the phase-shift phase of the Fiber Bragg Grating FBG that prior art produces.
The present invention realizes like this, the Fiber Bragg Grating FBG device that a kind of phase shift is adjustable, comprise fibre core and covering, on described fibre core, be formed with the Fiber Bragg Grating FBG of non-phase shift, on described fibre core, have one can fill fluid medium cavity, described cavity is divided into two parts by described Fiber Bragg Grating FBG, and cavity has the passage being communicated with outside.
Described Fiber Bragg Grating FBG device, wherein, described cavity is spherical cavity.
Described Fiber Bragg Grating FBG device, wherein, described passage is two passages, is communicated with respectively described cavity.
The present invention also provides the method for making of the adjustable Fiber Bragg Grating FBG device of a kind of phase shift, comprises the following steps:
Step 1: the phase mask by non-phase shift is inscribed out the Fiber Bragg Grating FBG of non-phase shift on the fibre core of optical fiber;
Step 2: fiber cut is become to two parts along Fiber Bragg Grating FBG, the end face center ablation of a disconnected optical fiber therein goes out an aperture, then the welding of the end face with the disconnected optical fiber of foraminate fiber end face and another root being discharged, forms the spherical cavity of a sealing at inside of optical fibre;
Step 3: process successively two passages from being formed with the upper and lower surface of optical fiber of the spherical cavity of sealing, described two passages are connected with described spherical cavity, and described spherical cavity is in communication with the outside.
The method for making of the Fiber Bragg Grating FBG device that described phase shift is adjustable, wherein, after described step 3, also comprise: Fiber Bragg Grating FBG device is immersed in fluid media (medium), and described fluid media (medium) fills up spherical cavity completely can obtain stable phase shift optical fiber Bragg grating; The fluid media (medium) of changing different refractivity in spherical cavity can regulate the phase-shift phase of grating exactly.
The method for making of the Fiber Bragg Grating FBG device that described phase shift is adjustable, wherein, is used wavelength to inscribe described Fiber Bragg Grating FBG for 193nm excimer laser in described step 1.
The method for making of the Fiber Bragg Grating FBG device that described phase shift is adjustable, wherein, is used optical fiber cutter to carry out cutting optical fibre in the center of Fiber Bragg Grating FBG in described step 2.
The method for making of the Fiber Bragg Grating FBG device that described phase shift is adjustable, wherein, the passage in described step 3 is used femtosecond laser parallel micromachining technology to process.
The method for making of the Fiber Bragg Grating FBG device that described phase shift is adjustable, wherein, described aperture is that diameter is less than the aperture that 10 microns, the degree of depth are less than 10 microns.
The method for making of the Fiber Bragg Grating FBG device that described phase shift is adjustable, wherein, the discharge discharge current of welding of described optical fiber splicer is that 16.3mA, discharge time are 2s.
The present invention compared with prior art, beneficial effect is: thereby by changing the phase-shift phase of the medium adjusting grating of the different refractivity value of filling in cavity, resulting phase-shift phase not only can linear regulation, can also stably keep, and overcome the shortcoming of the expensive and very flexible of phase shift phase mask plate method.
Accompanying drawing explanation
Fig. 1 is the structural representation of the adjustable Fiber Bragg Grating FBG device of phase shift;
Fig. 2 is the spectrogram without phase shift optical fiber Bragg grating;
Fig. 3 is the spectrogram that adopts the phase shift optical fiber Bragg grating of Fiber Bragg Grating FBG device acquisition;
Fig. 4 is the figure that Fiber Bragg Grating FBG device of the present invention obtains under optical microscope;
Fig. 5 is the process flow diagram of Fiber Bragg Grating FBG device manufacture method;
Fig. 6 a is that cavity has been filled the grating spectrum figure that grating resonance wavelength is 1579.30nm after the fluid media (medium) that refractive index is 1.412;
Fig. 6 b is that cavity has been filled the grating spectrum figure that grating resonance wavelength is 1579.61nm after the fluid media (medium) that refractive index is 1.414;
Fig. 6 c is that cavity has been filled the grating spectrum figure that grating resonance wavelength is 1579.66nm after the fluid media (medium) that refractive index is 1.418;
Fig. 6 d is that cavity has been filled the grating spectrum figure that grating resonance wavelength is 1579.70nm after the fluid media (medium) that refractive index is 1.422;
Fig. 7 is that the wavelength at grating phase shift peak is with the linear relationship curve map of the fluid media (medium) of filling different refractivity.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The most outstanding advantage of Fiber Bragg Grating FBG device that phase shift of the present invention is adjustable is that the phase-shift phase of grating can be according to the needs of different user, by fill the fluid media (medium) of respective indices of refraction in spherical cavity, not only can easily realize the linear regulation of phase-shift phase, can also keep phase-shift phase stable for a long time, and the method for making of described Fiber Bragg Grating FBG device is comparatively simple, without configuring expensive high-accuracy automatically controlled gearshift, accurately control phase-shift phase.
Be illustrated in figure 1 the structural drawing of the adjustable Fiber Bragg Grating FBG device of phase shift, described Fiber Bragg Grating FBG device comprises fibre core 102, covering 103, fiber grating 101, cavity 104 and path 10 5.In optical fiber, include described fibre core 102 and covering 103, described fibre core 102 and covering 103 form total reflection condition light can be transmitted at described optical fiber middle and long distance to low-loss.On described fibre core 102, be formed with the Fiber Bragg Grating FBG 101 of non-phase shift, Fiber Bragg Grating FBG 101 is to have periodic refractive index modulation structure, and its optical effect is equal to the catoptron of an arrowband, and its reflection wavelength depends on the periodic quantity of grating.On described fibre core 102, have one can fill fluid medium cavity 104, described fluid media (medium) has the refractive index of demarcation, described cavity 104 is divided into two parts by described Bragg grating, and cavity has the path 10 5 being communicated with outside.Described cavity 104 is realized the adjusting of grating phase-shift phase for injecting the fluid media (medium) of different refractivity.Inlet or the flow export of the fluid media (medium) that described path 10 5 is different refractivity, described path 10 5 can be set to one, two or more.The refractive index value of the position of described cavity 104, size and cavity 104 medium has determined to introduce the size of phase-shift phase, keeping under the condition of cavity 104 positions and size constancy, by changing the refractive index value of cavity medium, can realize the adjusting of grating phase-shift phase, thereby obtain a Fiber Bragg Grating FBG device that phase shift is adjustable.Preferably, described cavity 104 is placed in the centre position of described Fiber Bragg Grating FBG 101, can get best spectrum effects like this.
Combine with above-described embodiment, described cavity 104 is spherical cavity, and described optical fiber is single-mode fiber, and described path 10 5 is two passages, is communicated with respectively the relative both sides of described cavity 104.
As shown in Figure 5, the present invention also provides the method for making of the adjustable Fiber Bragg Grating FBG device of a kind of phase shift, comprises the following steps:
Step 1: use wavelength to inscribe out the high reflectance Fiber Bragg Grating FBG of non-phase shift by the phase mask of non-phase shift for 193nm excimer laser on the fibre core of optical fiber.
Step 2: use optical fiber cutter, along the center of Fiber Bragg Grating FBG, fiber cut is become to two parts, the end face center ablation of a disconnected optical fiber therein goes out an aperture, then the welding of the end face with the disconnected optical fiber of foraminate fiber end face and another root being discharged in optical fiber splicer, the high temperature and high pressure that electrode discharge produces causes aperture sharply to expand and then at inside of optical fibre, forms the spherical cavity of a sealing, the size of spherical cavity depends on the size of aperture on the one hand, also depends on the other hand the discharge parameter of electrode.
Step 3: process successively two passages from being formed with the upper and lower surface of optical fiber of the spherical cavity of sealing, described two passages are connected with described spherical cavity, and described spherical cavity is in communication with the outside, is convenient to extraneous fluid media (medium) and flows into and flow out.
After described step 3, also comprise: Fiber Bragg Grating FBG device is immersed in the fluid media (medium) of demarcating refractive index, and described fluid media (medium) fills up spherical cavity completely can obtain stable phase shift optical fiber Bragg grating; Described Fiber Bragg Grating FBG device is immersed in fluid media (medium) in use, and the fluid media (medium) of changing the different refractivity of submergence spherical cavity can regulate the phase-shift phase of grating exactly.
Combine with above-described embodiment, the aperture that in described step 2, ablation goes out is that diameter is less than the aperture that 10 microns, the degree of depth are less than 10 microns.Passage in described step 3 is used femtosecond laser parallel micromachining technology to process.
According to described Fiber Bragg Grating FBG device and preparation method thereof, concrete, first, adopt ArF excimer laser (wavelength 193nm) by phase mask, on single-mode fiber (Corning SMF-28e), to inscribe out the Fiber Bragg Grating FBG of non-phase shift, grating spectrum as shown in Figure 2,201 represent the reflectance spectrum of Fiber Bragg Grating FBG device, 202 represent the transmitted spectrum of Fiber Bragg Grating FBG device, wherein grating length is about 5mm, grating resonance wavelength is 1578nm, and optical grating reflection rate is higher than 99%.Then, Fiber Bragg Grating FBG 101 is cut off from center position, utilize the femtosecond laser parallel micromachining end face center ablation of a disconnected grating therein to go out 3 microns of diameters, the aperture that the degree of depth is approximately 2 microns, then the welding of the end face with the disconnected optical fiber of foraminate fiber end face and another root being discharged in optical fiber splicer, wherein discharge current is 16.3mA, be 2s discharge time, the high temperature and high pressure that electrode discharge produces causes aperture sharply to expand and then at inside of optical fibre, forms the cavity 104 of a sealing, preferably, described cavity is spherical cavity, spherical cavity diameter is about 50 μ m.Then, utilize femtosecond laser parallel micromachining technology to process successively pair of channels 105 from the upper and lower surface of optical fiber, make to seal spherical cavity and be in communication with the outside.As shown in Figure 3, the Fiber Bragg Grating FBG device of seeing under optical microscope as shown in Figure 4 for the phase shift spectrum of the Fiber Bragg Grating FBG device that obtains.In spherical cavity, fill the fluid media (medium) of different refractivity, can be accurately and regulate linearly the phase-shift phase of grating.Fig. 6 a, Fig. 6 b, Fig. 6 c, Fig. 6 d have contrasted respectively the grating spectrum after the fluid media (medium) of filling four kinds of different refractivities, and Fig. 7 has summed up the wavelength at grating phase shift peak with the linear relationship curve of fill fluid medium refraction index value.
Above-described Fiber Bragg Grating FBG device can be applied in following technical field: (1) narrow-line width single frequency optical fiber laser: the penetrating very bandwidth of tunable phase shift grating is narrow, can link easily in the loop of annular optical fiber laser, also can reduce to a great extent the output bandwidth of laser instrument simultaneously.(2) optical communication solution complex system: tunable phase shift grating has the characteristic that can change spectral window position in stopband, in multichannel light communication system, can be used to selector channel.For example, many ripples signal of coming from single channel is divided into multichannel, and each road is all joined the different fiber grating of phase-shift phase different wave length is selected.(3) optical fiber biochemical sensor: the biochemical reaction tank using the spherical cavity in the present invention as sensor, when the anti-raw reaction of tested bio-chemical solution causes its refraction index changing, moves biochemical reaction is monitored by detecting the wavelength at grating phase shift peak.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the Fiber Bragg Grating FBG device that phase shift is adjustable, comprise fibre core and covering, it is characterized in that, on described fibre core, be formed with the Fiber Bragg Grating FBG of non-phase shift, on described fibre core, have one can fill fluid medium cavity, described cavity is divided into two parts by described Fiber Bragg Grating FBG, and cavity has the passage being communicated with outside.
2. Fiber Bragg Grating FBG device according to claim 1, is characterized in that, described cavity is spherical cavity.
3. Fiber Bragg Grating FBG device according to claim 1, is characterized in that, described passage is two passages, is communicated with respectively described cavity.
4. a method for making for the adjustable Fiber Bragg Grating FBG device of phase shift, is characterized in that, comprises the following steps:
Step 1: the phase mask by non-phase shift is inscribed out the Fiber Bragg Grating FBG of non-phase shift on the fibre core of optical fiber;
Step 2: fiber cut is become to two parts along Fiber Bragg Grating FBG, the end face center ablation of a disconnected optical fiber therein goes out an aperture, then the welding of the end face with the disconnected optical fiber of foraminate fiber end face and another root being discharged, forms the spherical cavity of a sealing at inside of optical fibre;
Step 3: process successively two passages from being formed with the upper and lower surface of optical fiber of the spherical cavity of sealing, described two passages are connected with described spherical cavity, and described spherical cavity is in communication with the outside.
5. the method for making of the adjustable Fiber Bragg Grating FBG device of phase shift according to claim 4, it is characterized in that, after described step 3, also comprise: Fiber Bragg Grating FBG device is immersed in fluid media (medium), and described fluid media (medium) fills up spherical cavity completely can obtain stable phase shift optical fiber Bragg grating; The fluid media (medium) of changing different refractivity in spherical cavity can regulate the phase-shift phase of grating exactly.
6. the method for making of the adjustable Fiber Bragg Grating FBG device of phase shift according to claim 4, is characterized in that, uses wavelength to inscribe described Fiber Bragg Grating FBG for 193nm excimer laser in described step 1.
7. the method for making of the adjustable Fiber Bragg Grating FBG device of phase shift according to claim 4, is characterized in that, uses optical fiber cutter to carry out cutting optical fibre in the center of Fiber Bragg Grating FBG in described step 2.
8. the method for making of the adjustable Fiber Bragg Grating FBG device of phase shift according to claim 4, is characterized in that, the passage in described step 3 is used femtosecond laser parallel micromachining technology to process.
9. the method for making of the adjustable Fiber Bragg Grating FBG device of phase shift according to claim 4, is characterized in that, described aperture is that diameter is less than the aperture that 10 microns, the degree of depth are less than 10 microns.
10. the method for making of the adjustable Fiber Bragg Grating FBG device of phase shift according to claim 4, is characterized in that, the discharge discharge current of welding of described optical fiber splicer is that 16.3mA, discharge time are 2s.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105278031A (en) * | 2015-11-27 | 2016-01-27 | 武汉理工光科股份有限公司 | Method and device for fabricating phase-shift fiber Bragg grating |
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
| CN107436461A (en) * | 2017-08-20 | 2017-12-05 | 刘宝玉 | Four-quadrant fibre cladding Bragg gratings and preparation method thereof |
| CN110646878A (en) * | 2019-01-08 | 2020-01-03 | 北京信息科技大学 | Rapid preparation method of phase-shift Bragg fiber grating |
| CN111208070A (en) * | 2020-02-24 | 2020-05-29 | 浙江大学 | Optical fiber biochemical sensor and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050018966A1 (en) * | 2003-07-25 | 2005-01-27 | Kensuke Sasaki | Method and apparatus for fabricating fiber Bragg gratings |
| CN101520555A (en) * | 2009-04-17 | 2009-09-02 | 南开大学 | Functional material filled micro-structure optical fiber based tunable dual-channel grating filter |
| CN102564639A (en) * | 2011-12-29 | 2012-07-11 | 满文庆 | Photonic crystal fiber grating temperature sensor based on liquid filling and manufacturing method thereof |
-
2013
- 2013-11-13 CN CN201310566016.4A patent/CN103605179A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050018966A1 (en) * | 2003-07-25 | 2005-01-27 | Kensuke Sasaki | Method and apparatus for fabricating fiber Bragg gratings |
| CN101520555A (en) * | 2009-04-17 | 2009-09-02 | 南开大学 | Functional material filled micro-structure optical fiber based tunable dual-channel grating filter |
| CN102564639A (en) * | 2011-12-29 | 2012-07-11 | 满文庆 | Photonic crystal fiber grating temperature sensor based on liquid filling and manufacturing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| CHANGRUI LIAO，ET AL.: "Tunable phase-shifted fiber Bragg grating based on femtosecond laser fabricated in-grating bubble", 《OPTICS LETTERS》 * |
| WANG YIPING，ET AL.: "Fabrications and applications of fiber gratings based on microstructured optical fibers", 《深圳大学学报理工版》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105278031A (en) * | 2015-11-27 | 2016-01-27 | 武汉理工光科股份有限公司 | Method and device for fabricating phase-shift fiber Bragg grating |
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
| CN107436461A (en) * | 2017-08-20 | 2017-12-05 | 刘宝玉 | Four-quadrant fibre cladding Bragg gratings and preparation method thereof |
| CN110646878A (en) * | 2019-01-08 | 2020-01-03 | 北京信息科技大学 | Rapid preparation method of phase-shift Bragg fiber grating |
| CN111208070A (en) * | 2020-02-24 | 2020-05-29 | 浙江大学 | Optical fiber biochemical sensor and manufacturing method thereof |
| CN111208070B (en) * | 2020-02-24 | 2024-03-29 | 浙江大学 | Optical fiber biochemical sensor and manufacturing method thereof |
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Application publication date: 20140226 |