CN211603609U - Fiber grating element, electronic control fiber grating system and preparation system - Google Patents
Fiber grating element, electronic control fiber grating system and preparation system Download PDFInfo
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- CN211603609U CN211603609U CN202020345686.9U CN202020345686U CN211603609U CN 211603609 U CN211603609 U CN 211603609U CN 202020345686 U CN202020345686 U CN 202020345686U CN 211603609 U CN211603609 U CN 211603609U
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Abstract
The utility model discloses a fiber grating element, including optic fibre and electromagnetic induction material layer, electromagnetic induction material layer preparation covers optic fibre is followed on the normal position grating modulation zone of axial distribution. The fiber grating element is used for preparing the fiber grating without using expensive instrument and equipment, greatly saves equipment cost, simplifies the preparation process, can be heated only when being placed into an alternating magnetic field, greatly improves the safety factor, can modulate the written spectrum of the fiber grating in real time, has higher yield and controllable preparation time, is favorable for realizing mass production, and can recycle the fiber grating element for preparing different fiber gratings. The utility model also discloses an automatically controlled fiber grating system and preparation system.
Description
Technical Field
The utility model relates to an optical fiber sensing technology especially relates to a fiber grating component, automatically controlled fiber grating system and preparation system.
Background
The fiber grating has the advantages of small volume, low welding loss, compatibility with optical fibers, embedding of intelligent materials and the like, and the resonance wavelength of the fiber grating is sensitive to changes of external environments such as temperature, strain, refractive index, concentration and the like, so the fiber grating is widely applied to the fields of optical fiber communication and sensing. The existing fiber grating preparation methods mainly comprise a CO2 laser etching method, an arc discharge method, an HF wet etching method, a periodic deformation, an amplitude mask method, a femtosecond laser direct writing method and the like. By way of illustration, a comparative typical processing among others is as follows:
CO2 laser etching method: a single laser pulse passes through a focusing lens and irradiates on an optical fiber, an imaging system is erected on the optical fiber to observe whether light deforms in the grating writing process, the grating is written point by point through laser on one side, the on-off of the laser is controlled by a switch, and after irradiation is carried out on one position, the position of the optical fiber is moved axially to write the next grating area. This writing technology advantage is obvious, need not to carry out the sensitization to optic fibre, can be through the convenient control laser motion trail of computer, but has certain defect, carves the switching-on of in-process through computer operation laser and the displacement of optic fibre, hardly guarantees the precision that focus laser facula and optic fibre aim at every turn, is unfavorable for grating and carves stability and the uniformity of writing.
An amplitude mask method: the key of the method is that the amplitude mask plate can induce the periodic refractive index change in the optical fiber to manufacture the long-period grating structure after the ultraviolet light penetrates through the amplitude mask plate to transversely expose the optical fiber. Because the period of the long periodic fiber grating is larger, the manufacturing precision of the mask can be ensured, and therefore, the grating which has high consistency and meets the spectrum requirement is easy to obtain, and the method is continuously used and is in the mainstream position of the preparation process. However, the method has many disadvantages, firstly, photosensitive optical fiber is needed, the finished product is unstable at high temperature, the LPG needs to be annealed to ensure that the LPG can be used at high temperature, and secondly, the period of the amplitude mask is fixed, so that the period length cannot be flexibly adjusted according to the requirement, and the preparation cost is greatly increased.
Femtosecond laser direct writing method: the femtosecond laser focus focused by the objective lens is incident into the fiber core of the germanium-doped optical fiber, the refractive index of the region irradiated by the laser is increased, and meanwhile, the optical fiber is moved in parallel, so that a periodic waveguide structure is formed in the glass. The femtosecond laser is used for directly writing the fiber grating, a phase (amplitude) mask plate is not needed, and the fiber grating of any type can be prepared only by controlling the relative position of a facula focus on a fiber core.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiencies of the prior art, the utility model provides a fiber grating component, automatically controlled fiber grating system and preparation system need not to use expensive instrument and equipment, greatly practiced thrift equipment cost, the preparation technology has been simplified, the fiber grating component just can be heated in only putting into alternating magnetic field, factor of safety improves greatly, but fiber grating's write spectrum real-time modulation, the yields is higher, the preparation time is controllable, be favorable to realizing mass production, and can retrieve the reuse for preparing different fiber grating to the fiber grating component.
The utility model discloses the technical problem that will solve realizes through following technical scheme:
the fiber grating element comprises an optical fiber and an electromagnetic induction material layer, wherein the electromagnetic induction material layer is prepared to cover a normal grating modulation area of the optical fiber distributed along the axial direction.
An electric control fiber grating system comprises the fiber grating element and a magnetic field generating device, wherein the magnetic field generating device is used for generating an alternating magnetic field which interacts with an electromagnetic induction material layer, so that the electromagnetic induction material layer generates heat to further heat a normal grating modulation area of the fiber grating element, and the refractive index of the normal grating modulation area is changed to form a fiber grating.
The fiber grating optical fiber connector further comprises an input connector and an output connector, wherein the input connector is arranged at one end of the fiber grating element, the output connector is arranged at the other end of the fiber grating element, or the input connector and the output connector are arranged at the same end of the fiber grating element.
And the input connector and the output connector are connected to the same end of the fiber grating element through the coupling device.
Furthermore, the magnetic field generating device comprises a magnetic field emitter and a power supply control module, wherein the power supply control module is electrically connected with the magnetic field emitter to output alternating current to the magnetic field emitter, so that the magnetic field emitter generates the alternating magnetic field.
Further, the magnetic field emitter comprises an electromagnetic coil axially surrounding the fiber grating element.
A system for preparing electric control fiber grating comprises the electric control fiber grating system and
the light source generating device is used for coupling detection light beams into the fiber grating element;
and the spectrum detection device is used for receiving the light beam transmitted or reflected from the fiber grating element to obtain a real-time written spectrum of the fiber grating.
Further, the light source generating device is connected to one end of the fiber grating element, and the spectrum detecting device is connected to the other end of the fiber grating element, or the light source generating device and the spectrum detecting device are connected to the same end of the fiber grating element.
And the light source generating device and the spectrum detecting device are connected to the same end of the fiber grating element through the coupling device.
Further, still include:
and the processing control host is connected between the spectrum detection device and the magnetic field generation device and is used for automatically controlling the magnetic field generation device according to the real-time writing spectrum obtained by the spectrum detection device so as to automatically modulate the real-time writing spectrum of the fiber bragg grating into the required writing spectrum.
The utility model discloses following beneficial effect has: this fiber grating component, automatically controlled fiber grating system and preparation system carry out electromagnetic induction with the electromagnetic induction material layer of different distribution laws, can prepare different fiber grating, need not to use expensive instrument and equipment, greatly practiced thrift equipment cost, simplified preparation technology, the fiber grating component just can be heated in putting into alternating magnetic field, factor of safety improves greatly, fiber grating's the spectrum of writing can be modulated in real time, the yields is higher, preparation time is controllable, be favorable to realizing mass production, and recoverable reuse.
Drawings
Fig. 1 is a block diagram illustrating steps of a method for manufacturing an electrically controlled fiber grating according to the present invention;
FIG. 2 is a schematic diagram of a fiber grating element of a long periodic fiber grating according to the present invention;
FIG. 3 is a transmitted light spectrum of the long period fiber grating shown in FIG. 2;
FIG. 4 is a schematic diagram of a fiber grating element of a short-period fiber grating according to the present invention;
FIG. 5 is a reflection spectrum of the short-period fiber grating of FIG. 4;
fig. 6 is a schematic diagram of a fiber grating element of an aperiodic fiber grating according to the present invention;
FIG. 7 is a reflection spectrum of the aperiodic fiber grating of FIG. 6;
fig. 8 is a schematic view of a system for manufacturing an electrically controlled fiber grating according to the present invention;
fig. 9 is a schematic view of another system for manufacturing an electrically controlled fiber grating according to the present invention;
fig. 10 is a block diagram illustrating the steps of the method for pre-processing the electrically controlled fiber grating according to the present invention;
fig. 11 is a block diagram of step S1.2 in the method for pre-processing an electrically controlled fiber grating shown in fig. 10;
fig. 12 is a block diagram of another step S1.2 in the method for pre-processing an electrically controlled fiber grating shown in fig. 10;
fig. 13 is a block diagram of another step S1.2 in the method for preprocessing the electrically controlled fiber grating shown in fig. 10.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example one
As shown in fig. 1, 2, 4 and 6, a method for preparing an electrically controlled fiber grating includes the following steps:
step S1: the optical fiber 11 is preprocessed to manufacture and cover an electromagnetic induction material layer 12 on the normal grating modulation area distributed along the axial direction of the optical fiber 11, so as to form the optical fiber grating element 1.
In step S1, the electromagnetic induction material layer 12 may be made of metal such as iron, nickel, cobalt, or oxide or alloy containing such metal, such as: iron oxide, silicon steel, stainless steel, iron-cobalt alloy, nickel-cobalt alloy, and the like, which have good electrical conductivity and good magnetic permeability, and in addition, rare earth or rare earth-containing oxide or alloy can also be used for manufacturing the electromagnetic induction material layer 12.
Step S2: and (2) adopting an alternating magnetic field to act with the electromagnetic induction material layer 12, so that the electromagnetic induction material layer 12 generates heat to further heat the normal grating modulation area of the optical fiber 11, so as to change the refractive index of the normal grating modulation area and form the optical fiber grating.
In step S2, when the alternating magnetic field acts on the electromagnetic induction material layer 12, based on the electromagnetic induction principle, a current vortex is formed inside the electromagnetic induction material layer 12, the current vortex has a thermal effect and can cause the electromagnetic induction material layer 12 to generate heat, and based on the fiber optic thermal effect, the refractive index of the normal grating modulation region is changed under the heating of the electromagnetic induction material layer 12 to form the fiber grating.
Since the refractive index of the normal grating modulation region is changed along with the temperature change of the normal grating modulation region, the writing spectrum of the fiber grating can be modulated by controlling the heating value of the electromagnetic induction material layer 12. Therefore, the preparation method further includes, after step S2:
step S3: and modulating the real-time writing spectrum of the fiber grating into the required writing spectrum by controlling the alternating magnetic field.
In step S3, the alternating current generating the alternating magnetic field is controlled to control the alternating magnetic field, the current voltage intensity and the alternating frequency of the alternating current respectively correspond to the magnetic field intensity and the alternating frequency of the alternating magnetic field, and the heat value of the electromagnetic induction material layer 12 is determined together, so that the grating modulation amount of the normal grating modulation area, that is, the resonance peak wavelength and the loss peak intensity of the fiber grating, is determined, the preparation modulation time is inversely related to the current voltage intensity and the alternating frequency of the alternating current, and the larger the current voltage intensity and the alternating frequency of the alternating current, the smaller the preparation modulation time of the fiber grating is, and the larger the preparation modulation time is.
Accordingly, at least one of the resonance peak wavelength, the loss peak intensity, and the production modulation time of the fiber grating can be modulated by controlling the current-voltage intensity and/or the alternating frequency of the alternating current (i.e., the magnetic field intensity and/or the alternating frequency of the alternating magnetic field).
Specifically, in step S3, the step of modulating the real-time writing spectrum of the fiber grating into the desired writing spectrum includes:
step S3.1: a detection beam is coupled into the fiber grating element 1.
In this step S3.1, the detection beam coupled into the fiber grating element 1 is preferably a super-continuous broadband beam, the detection spectrum of which continuously covers a large wavelength range.
Step S3.2: and receiving the light beams transmitted or reflected from the fiber grating element 1 to obtain the real-time written spectrum of the fiber grating.
In this step S3.2, when the detection light beam passes through the modulation region of the normal position grating in the transmission process of the fiber grating element 1, a part of the detection light beam is reflected back by the fiber grating to form a reflected light beam, so as to obtain a reflected spectrum, and another part of the detection light beam can be transmitted forward through the fiber grating to form a transmitted light beam, so as to obtain a transmitted spectrum, where the reflected spectrum and the transmitted spectrum are complementary to each other, so as to form the spectrum of the detection light beam coupled into the fiber grating element 1 in the step S3.1.
The real-time writing spectrum and the required writing spectrum of the fiber grating can be represented by the reflection spectrum or the transmission spectrum.
Step S3.3: and controlling the alternating magnetic field to modulate the real-time writing spectrum of the fiber bragg grating into the required writing spectrum.
In step S3.3, the real-time writing spectrum of the fiber grating is compared with the required writing spectrum, if the real-time writing spectrum is the same as the required writing spectrum, the modulation is ended, and if the real-time writing spectrum is different from the required writing spectrum, the alternating magnetic field is controlled to change, and steps S3.1 to S3.3 are repeated until the real-time writing spectrum of the fiber grating is the same as the required writing spectrum, and the modulation is ended.
Since the refractive index of the modulation region of the grating is changed along with the temperature change, the fiber grating is not permanent, when the alternating magnetic field is removed and the temperature of the modulation region of the grating is recovered to normal, the fiber grating will also disappear, and the fiber grating element 1 is equivalent to a common optical fiber, so before each use, the fiber grating element 1 needs to be modulated into a fiber grating with a desired writing spectrum through the above steps S2 and S3, and the alternating magnetic field cannot be removed during use, and the fiber grating needs to be modulated while being used, so as to avoid the deviation of the real-time writing spectrum of the fiber grating caused by the temperature change of the modulation region of the grating.
The preparation method can be used for preparing long-period fiber gratings, short-period fiber gratings or non-periodic fiber gratings.
In one embodiment, as shown in fig. 2, the fiber grating is a long periodic fiber grating, the grating period lambada =0.5mm, the grating order is N, the resonance wavelength position of the long periodic fiber grating is firstly calculated by utilizing a phase matching formula, to determine the positions of the normal grating modulation regions periodically distributed along the axial direction of the optical fiber 11, then, the electromagnetic induction material layer 12 is covered on N normal grating modulation areas which are periodically distributed along the axial direction of the optical fiber 11 by 0.5mm to obtain the optical fiber grating element 1, then the alternating magnetic field is adopted to act with the electromagnetic induction material layer 12, and heating the normal grating modulation area to enable the fiber grating element 1 to form a long-period fiber grating, and finally modulating the real-time writing spectrum of the long-period fiber grating into a transmission spectrum as shown in fig. 3.
In another embodiment, as shown in fig. 4, the fiber grating is a short periodic fiber grating, the grating period is lambada =0.1mm, the grating order is N, the resonant wavelength position of the short periodic fiber grating is firstly calculated by utilizing a phase matching formula, to determine the positions of the normal grating modulation regions periodically distributed along the axial direction of the optical fiber 11, then, the electromagnetic induction material layer 12 is covered on N normal grating modulation areas which are periodically distributed along the axial direction of the optical fiber 11 by 0.1mm to obtain the optical fiber grating element 1, then the alternating magnetic field is adopted to act with the electromagnetic induction material layer 12, heating the normal grating modulation area to enable the fiber grating element 1 to form a short-period fiber grating, and finally modulating the real-time writing spectrum of the short-period fiber grating into a reflection spectrum as shown in fig. 5.
In another embodiment, as shown in fig. 6, the fiber grating is an aperiodic fiber grating, the aperiodic grating pitch is Λ 1, Λ 2, … … Λ N in sequence, the grating order is N, similarly, the resonant wavelength position of the aperiodic fiber grating is calculated by using a phase matching formula to determine the position of the aperiodic fiber grating modulation region in the axial direction of the fiber 11, then the electromagnetic induction material layer 12 is covered on N aperiodic fiber grating modulation regions in the axial direction of the fiber 11 at the pitches of Λ 1, Λ 2, … … Λ N to obtain the fiber grating element 1, and then the fiber grating element 1 is formed by heating the aperiodic fiber grating modulation region by using the alternating magnetic field to act on the electromagnetic induction material layer 12, finally, the real-time written spectrum of the aperiodic fiber grating is modulated into a reflection spectrum as shown in fig. 7.
Example two
As shown in fig. 10, 2, 4 and 6, a method for pre-processing an electrically controlled fiber grating, which can be used as step S1 in the preparation method according to the first embodiment, includes the following steps:
step S1.1: and determining the positions of the normal grating modulation areas of the needed fiber gratings along the axial direction of the optical fiber 11 according to a phase matching formula.
In step S1.1, the position of the resonance peak of the corresponding fiber grating can be calculated according to the phase matching formula corresponding to the long-periodicity, short-periodicity, or aperiodic fiber grating. The phase matching formula is common knowledge in the art, so the present embodiment is described as follows with only a short periodic grating fiber:
the phase matching formula of the short-period grating fiber is m x lambdaB=2*neffΛ, where m is the grating order of the desired fiber grating, λBIs the central reflection wavelength, n, of the desired fiber gratingeffThe effective refractive index of the fiber core is Λ the grating period (grating pitch) of the required fiber grating, according to the phase matching formula, under the condition of determining the grating period Λ and the grating order m of the required fiber grating, the central reflection wavelength lambda of the required fiber grating can be calculatedBIn turn, the central reflection wavelength λ of the desired fiber grating is determinedBIn this case, the relationship between the grating period Λ and the grating order m of the desired fiber grating can be calculated.
Step S1.2: and manufacturing and covering an electromagnetic induction material layer 12 on the normal grating modulation area distributed along the axial direction of the optical fiber 11.
In one embodiment, as shown in fig. 11, step S1.2 includes the steps of:
step S1.2.1: a layer of insulating material is formed over the surface of the optical fiber 11.
In this step s1.2.1, the insulating material layer may be, but not limited to, rubber, silica gel, or plastic, which has both good insulating ability and good heat insulating ability.
Step S1.2.2: and stripping the insulating heat insulation material layer covering the normal grating modulation area to expose the normal grating modulation area from the insulating heat insulation material layer.
In this step S1.2.2, the insulating and heat-insulating material layer may be partially peeled off by cutting or CO2 laser etching.
Step S1.2.3: and manufacturing and covering the electromagnetic induction material layer 12 on the exposed normal grating modulation area.
In step S1.2.3, the electromagnetic induction material layer 12 may be formed by vacuum coating, magnetron sputtering, or spraying. During manufacturing, the electromagnetic induction material layer 12 may cover only the exposed normal grating modulation area, or cover the exposed normal grating modulation area and the insulating and heat-insulating material layer at the same time. Because the insulating properties and the heat-proof quality of insulating thermal insulation material layer, electromagnetic induction material layer 12 is in electric current and the heat that produce in the alternating magnetic field can not outwards spread.
In another embodiment, as shown in fig. 12, step S1.2 comprises:
step S1.2.1: a coating material layer is formed on the surface of the optical fiber 11.
In this step s1.2.1, the coating material layer needs to satisfy the requirement that the electromagnetic induction material layer 12 can be removed by a different solution, that is, there is a solution that can dissolve or corrode the coating material layer, but cannot dissolve or corrode the electromagnetic induction material layer 12, for example, if the coating material layer is made of organic materials such as rubber, silica gel, or plastic, the coating material layer is easily dissolved by an organic solvent, and the electromagnetic induction material layer 12 made of metals such as iron, nickel, cobalt, or oxides or alloys containing such metals is difficult to dissolve by an organic solvent.
Step S1.2.2: and stripping the coating material layer covering the normal grating modulation area to expose the normal grating modulation area from the coating material layer.
In this step S1.2.2, the coating material layer may be partially peeled off by cutting or CO2 laser.
Step S1.2.3: and manufacturing and covering the electromagnetic induction material layer 12 on the exposed normal grating modulation area.
In step S1.2.3, the electromagnetic induction material layer 12 may be formed by vacuum coating, magnetron sputtering, or spraying. During manufacturing, the electromagnetic induction material layer 12 may cover only the exposed normal grating modulation region, or may cover both the exposed normal grating modulation region and the coating material layer.
Step S1.2.4: the remaining coating material layer is stripped.
In this step S1.2.4, the remaining coating material layer is peeled off and simultaneously carries away the electromagnetic induction material layer 12 covering thereon, leaving only the electromagnetic induction material layer 12 covering the normal grating modulation region.
As described above, since the organic solvent can dissolve the coating material layer made of an organic material such as rubber, silicone, or plastic, and it is difficult to dissolve the electromagnetic induction material layer 12, the remaining coating material layer can be peeled off by the organic solvent in step S1.2.4.
In a further embodiment, as shown in fig. 13, step S1.2 comprises:
step S1.2.1: and manufacturing a layer 12 covering the electromagnetic induction material on the surface of the optical fiber 11.
In this step s1.2.1, the electromagnetic induction material layer 12 may be manufactured by vacuum coating, magnetron sputtering, spraying, or the like.
Step S1.2.2: and manufacturing and covering a photosensitive material layer on the surface of the electromagnetic induction material layer.
In step S1.2.2, the photosensitive material layer may be a positive photoresist or a negative photoresist, and is formed by coating.
Step S1.2.3: and exposing and developing the photosensitive material layer to expose the electromagnetic induction material layer 12 covered outside the normal grating modulation area from the photosensitive material layer.
In step S1.2.3, the photosensitive material layer is exposed to ultraviolet light through a photolithography mask, and then the exposed or unexposed portions of the photosensitive material layer are removed by a developer, the exposed portions of the positive photoresist are removed by the developer, and the unexposed portions of the negative photoresist are removed by the developer.
Step S1.2.4: and etching and removing the exposed electromagnetic induction material layer 12.
In step S1.2.4, if the electromagnetic induction material layer 12 is made of metal such as iron, nickel, cobalt, or an oxide or an alloy containing such metal, the exposed electromagnetic induction material layer 12 can be removed by etching with an acidic solution, and the remaining photosensitive material layer is difficult to be corroded by the acidic solution.
Step S1.2.5: and stripping the rest of the photosensitive material layer.
In this step S1.2.5, the remaining photosensitive material layer may be stripped using an alkaline solution, and the electromagnetic induction material layer 12 made of a metal such as iron, nickel, or cobalt, or an oxide or an alloy containing such a metal is difficult to be corroded by the alkaline solution.
EXAMPLE III
As shown in fig. 2, 4 and 6, a fiber grating element 1 includes an optical fiber 11 and an electromagnetic induction material layer 12, wherein the electromagnetic induction material layer 12 is prepared to cover a normal grating modulation region of the optical fiber 11 distributed along an axial direction.
The electromagnetic induction material layer 12 may be made of iron, nickel, cobalt, or other metals or oxides or alloys containing such metals, such as: iron oxide, silicon steel, stainless steel, iron-cobalt alloy, nickel-cobalt alloy, and the like, which have good electrical conductivity and good magnetic permeability, and in addition, rare earth or rare earth-containing oxide or alloy can also be used for manufacturing the electromagnetic induction material layer 12.
Example four
As shown in fig. 8 and 9, an electrically controlled fiber grating system includes a fiber grating element 1 and a magnetic field generating device 2 according to the third embodiment, where the magnetic field generating device 2 is configured to generate an alternating magnetic field acting on the electromagnetic induction material layer 12, so that the electromagnetic induction material layer 12 generates heat to heat a normal grating modulation region of the optical fiber 11, so as to change a refractive index of the normal grating modulation region, thereby forming a fiber grating.
The electric control fiber grating system further comprises an input connector and an output connector, wherein the input connector is arranged at one end of the fiber grating element 1, the output connector is arranged at the other end of the fiber grating element 1, or the input connector and the output connector are arranged at the same end of the fiber grating element 1.
The magnetic field generating device 2 comprises a magnetic field emitter 21 and a power supply control module 22, wherein the power supply control module 22 is electrically connected with the magnetic field emitter 21 to output alternating current to the magnetic field emitter 21, so that the magnetic field emitter 21 generates the alternating magnetic field.
In this embodiment, the magnetic field emitter 21 comprises an electromagnetic coil, which is axially wrapped around the fiber grating element 1.
The input joint is used for connecting a light source generating device 3, so that the light source generating device 3 can couple detection light beams into the fiber bragg grating element 1; the output connector is used for connecting a spectrum detection device 4, so that the spectrum detection device 4 receives the light beam transmitted or reflected from the fiber grating element 1 to obtain a real-time written spectrum of the fiber grating.
When the input connector and the output connector are arranged at the same end of the fiber grating element 1, the electronic control fiber grating system further comprises a coupling device 5, the input connector and the output connector are connected to the same end of the fiber grating element 1 through the coupling device 5, the coupling device 5 can couple incident detection light beams into the fiber grating element 1, and couple reflected light beams into the spectrum detection device 4.
EXAMPLE five
As shown in FIGS. 8 and 9, a system for manufacturing an electrically controlled fiber grating, not limited to the manufacturing method of the first embodiment, includes the electrically controlled fiber grating system of the fourth embodiment, and
the light source generating device 3 is used for coupling detection light beams into the fiber grating element 1;
and the spectrum detection device 4 is used for receiving the light beam transmitted or reflected from the fiber grating element 1 to obtain a real-time written spectrum of the fiber grating.
The light source generating device 3 is connected to an input connector of the electric control fiber grating system, and the spectrum detecting device 4 is connected to an output connector of the electric control fiber grating system.
In a specific implementation manner, as shown in fig. 8, the light source generating device 3 is connected to one end of the fiber grating element 1, the spectrum detecting device 4 is connected to the other end of the fiber grating element 1, when the detection light beam passes through the normal grating modulation region during transmission in the fiber grating element 1, part of the detection light beam will continue to be transmitted forward through the fiber grating, and the spectrum detecting device 4 receives the transmitted light beam to obtain a transmission spectrum as a real-time writing spectrum of the fiber grating.
In another specific implementation manner, as shown in fig. 9, the light source generating device 3 and the spectrum detecting device 4 are connected to the same end of the fiber grating element 1, during transmission of the detection light beam in the fiber grating element 1, when the detection light beam passes through the normal grating modulation region, part of the detection light beam is reflected by the fiber grating and returns back, and the spectrum detecting device 4 receives the reflected light beam to obtain a reflection spectrum as a real-time writing spectrum of the fiber grating.
In this case, preferably, the light source generating device 3 and the spectrum detecting device 4 are connected to the same end of the fiber grating element 1 through a coupling device 5, and the coupling device 5 can couple the incident detecting light beam into the fiber grating element 1 and couple the reflected light beam into the spectrum detecting device 4.
When modulating the real-time written spectrum of the fiber grating, a technician can manually control the power control module 22 in the magnetic field generating device 2 according to the real-time written spectrum obtained by the spectrum detecting device 4 to control the alternating current output by the power control module 22, further control the alternating magnetic field generated by the magnetic field transmitter 21, and finally modulate the real-time written spectrum of the fiber grating into the required written spectrum.
Of course, the preparation system may further include a processing control host (not shown in the figure), which is communicatively connected between the spectrum detection device 4 and the magnetic field generation device 2, and is configured to automatically control the power control module 22 of the magnetic field generation device 2 according to the real-time written spectrum obtained by the spectrum detection device 4, so as to automatically modulate the real-time written spectrum of the fiber bragg grating into the desired written spectrum.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is specific and detailed, but the invention can not be understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by adopting the equivalent substitution or equivalent transformation should fall within the protection scope of the present invention.
Claims (10)
1. The fiber grating element is characterized by comprising an optical fiber and an electromagnetic induction material layer, wherein the electromagnetic induction material layer is prepared to cover a normal grating modulation area of the optical fiber distributed along the axial direction.
2. An electrically controlled fiber grating system comprising the fiber grating element of claim 1 and a magnetic field generating device, wherein the magnetic field generating device is configured to generate an alternating magnetic field that interacts with the electromagnetic induction material layer, so that the electromagnetic induction material layer generates heat to heat the normal grating modulation region of the fiber grating element, thereby changing the refractive index of the normal grating modulation region to form a fiber grating.
3. The electrically controlled fiber grating system according to claim 2, further comprising an input connector and an output connector, wherein the input connector is disposed at one end of the fiber grating element, and the output connector is disposed at the other end of the fiber grating element, or wherein the input connector and the output connector are disposed at the same end of the fiber grating element.
4. An electrically controlled fiber grating system according to claim 3, further comprising a coupling device, wherein the input connector and the output connector are connected to the same end of the fiber grating element through the coupling device.
5. The electrically controlled fiber grating system according to claim 2, wherein the magnetic field generator comprises a magnetic field emitter and a power control module, and the power control module is electrically connected to the magnetic field emitter to output an alternating current to the magnetic field emitter, so that the magnetic field emitter generates the alternating magnetic field.
6. An electrically controlled fiber grating system according to claim 5, wherein the magnetic field emitter comprises an electromagnetic coil axially surrounding the fiber grating element.
7. A system for preparing an electrically controlled fiber grating, comprising an electrically controlled fiber grating system according to any one of claims 2 to 5 and
the light source generating device is used for coupling detection light beams into the fiber grating element;
and the spectrum detection device is used for receiving the light beam transmitted or reflected from the fiber grating element to obtain a real-time written spectrum of the fiber grating.
8. The system for manufacturing an electrically controlled fiber grating according to claim 7, wherein the light source generating device is connected to one end of the fiber grating element, and the spectrum detecting device is connected to the other end of the fiber grating element, or the light source generating device and the spectrum detecting device are connected to the same end of the fiber grating element.
9. The system for manufacturing an electrically controlled fiber grating according to claim 8, further comprising a coupling device, wherein the light source generating device and the spectrum detecting device are connected to the same end of the fiber grating element through the coupling device.
10. The system for manufacturing an electrically controlled fiber grating according to claim 7, further comprising:
and the processing control host is connected between the spectrum detection device and the magnetic field generation device and is used for automatically controlling the magnetic field generation device according to the real-time writing spectrum obtained by the spectrum detection device so as to automatically modulate the real-time writing spectrum of the fiber bragg grating into the required writing spectrum.
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|---|---|---|---|---|
| CN111208604A (en) * | 2020-03-19 | 2020-05-29 | 深圳大学 | Fiber grating element, electronic control fiber grating system and preparation system |
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