CN113064233A - Method and system for eliminating large-capacity grating array ghost - Google Patents
Method and system for eliminating large-capacity grating array ghost Download PDFInfo
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- CN113064233A CN113064233A CN202110306316.3A CN202110306316A CN113064233A CN 113064233 A CN113064233 A CN 113064233A CN 202110306316 A CN202110306316 A CN 202110306316A CN 113064233 A CN113064233 A CN 113064233A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000013307 optical fiber Substances 0.000 claims description 29
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 9
- 238000001228 spectrum Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B2006/02166—Methods of designing the gratings, i.e. calculating the structure, e.g. algorithms, numerical methods
Abstract
The invention discloses a grating inscribing method for eliminating large-capacity grating array ghost, which changes the distance between any two adjacent gratings in the process of inscribing the grating array so that the difference between adjacent intervals is not zero. The invention can effectively eliminate the ghost phenomenon generated after the large-capacity grating array is reflected for multiple times.
Description
Technical Field
The invention relates to the field of fiber grating sensing, in particular to a method and a system for eliminating ghost shadow of a large-capacity grating array.
Background
A large-capacity grating array sensing system is a novel optical fiber sensing system which is rapidly developed in recent years, tens of thousands of sensing gratings can be continuously written on one optical fiber, the minimum writing interval reaches 10cm, and due to the adoption of the OTDR (optical time domain reflection) principle, the time returned by different grating signals is utilized for positioning. Due to the limited scanning bandwidth of the light source, most gratings use the same wavelength (with a certain difference) and have equal spacing, which results in multiple reflections between the gratings. The ghost image generated by multiple reflections of different gratings is superimposed on a certain real spectrum, which greatly affects the demodulation precision of the system and even causes demodulation errors.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a system for effectively eliminating the ghost image generated by multiple reflections, aiming at the defect that the multiple reflections of the large-capacity grating array in the prior art generate the ghost image.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a grating inscribing method for eliminating ghost image of large-capacity grating array is provided, in the process of inscribing the grating array, the distance between any two adjacent gratings is changed, and the difference between adjacent intervals is not zero.
According to the technical scheme, a random variable delta d is added in the process of writing the grating arraynSo that the interval between two adjacent gratings is d + delta dnWhere d is a constant value, Δ dnThe random value of (A) is between-0.1 d and 0.1 d.
According to the technical scheme, in the process of writing the grating array, the time interval of writing the grating by the grating array wire drawing tower is controlled, so that the distances between the gratings with the same wavelength are not completely equal.
The invention also provides a grating inscribing system for eliminating large-capacity grating array ghost, which comprises an excimer laser, a grating mask plate, a high-precision meter measuring device and a controller, wherein:
an excimer laser for grating writing of the optical fiber,
the grating mask plate is used for controlling the wavelength of the writing grating;
the high-precision meter counter is connected with the excimer laser and the controller and is used for feeding back the advancing speed of the current optical fiber;
the controller is used for setting the advancing speed of the optical fiber and calculating the current real-time speed of the optical fiber according to the feedback information of the high-precision meter counter so as to adjust the advancing speed of the optical fiber in real time; the controller is also configured to set the grating writing intervals such that the difference between adjacent intervals is not zero.
According to the technical scheme, the excimer laser comprises a laser and a feedback module, the laser performs writing by receiving an instruction of the controller, and the feedback module feeds back the light emitting power of the laser and the light spot quality of the grating mask plate to the controller through CCD imaging; the controller sends a fine adjustment instruction to the excimer laser and the grating mask plate according to a feedback result of the feedback module.
In connection with the above technical solution, the controller is specifically configured to: adjusting a grating mask plate to a preset position, controlling an excimer laser to write a grating, clearing 0 of a code of a high-precision meter counter by a controller after writing, acquiring the current real-time position of the mask plate and the output power of the laser through a CCD (charge coupled device) feedback system of the excimer laser, and comparing and finely adjusting the current real-time position with the preset value; and when the code of the high-precision length counter reaches the preset grating writing interval, the controller controls the excimer laser to write the grating again and repeats the steps.
According to the technical scheme, the controller adds a random variable delta d to the preset grating writing interval dnSo that the interval between two adjacent gratings is d + delta dn，ΔdnThe random value of (A) is between-0.1 d and 0.1 d.
According to the technical scheme, the controller is used for engraving the gratings with the same wavelength by adjusting the position of the grating mask plate; or different grating mask plates are switched to write gratings with different wavelengths.
According to the technical scheme, the controller controls the time interval of grating writing of the grating array wire drawing tower, so that the distances between the gratings with the same wavelength are not completely equal.
According to the technical scheme, the controller comprises an ARM processing chip and a plurality of serial port communication interfaces, and is connected with the excimer laser, the grating mask plate and the high-precision meter reader through the serial port communication interfaces.
The invention also provides a grating inscribing method for eliminating the ghost of the large-capacity grating array, which is based on the grating inscribing system for eliminating the ghost of the large-capacity grating array in the technical scheme, and the method comprises the following steps:
s1, the controller adjusts the advancing speed v of the optical fiber, the light emitting power P of the laser and the position S of the grating mask plate according to the feedback information, and the high-precision meter counter is set to be 0;
s2, based on the set grating writing interval d, generating random number delta d within + -10% multiplied by dnTo obtain a new grating interval d' ═ d + Δ dn；
S3, acquiring the coding information of the high-precision meter counter in real time;
s4, judging whether the code of the high-precision meter counter is equal to d';
s5, if the high-precision length counter code is equal to d', the excimer laser carries out grating inscription;
s6, the controller acquires feedback information of the excimer laser;
and S7, judging whether the number of the optical fiber inscriptions reaches a preset value or not according to the feedback information, if so, ending the program, and otherwise, returning to the step S1.
The invention has the following beneficial effects: in the process of writing the grating array, the distance between any two adjacent gratings is changed, so that the difference between the adjacent intervals is not zero, even if the distances between the adjacent gratings are different, and the ghost phenomenon formed in the grating spectrum at the rear end of the link by multiple reflections can be effectively reduced.
Furthermore, a random variable can be added on the basis of the preset grating writing interval, the random variable is generally 10% of the preset interval, the use of the grating is not influenced, and the influence of multiple reflections can be perfectly eliminated.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a diagram illustrating the effect of "ghosting" caused by multiple reflections according to an embodiment of the present invention.
FIG. 2 is a block diagram of a grating writing system for eliminating "ghosting" of a large-volume grating array according to an embodiment of the present invention.
FIG. 3 is a flowchart of a grating writing method for eliminating "ghost" in a large-volume grating array according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of multiple reflection of a grating array according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the process of writing the large-capacity grating array, the difference between adjacent intervals is not zero through the distance between any two adjacent gratings, so that ghost images generated by multiple reflection of the large-capacity grating array are eliminated.
In particular, a random variable Δ d may be added during the writing of the grating arraynSo that the interval between two adjacent gratings is d + delta dnWhere d is a constant value, Δ dnThe random value of (A) is between-0.1 d and 0.1 d.
The distance between the gratings with the same wavelength can be made not equal completely by controlling the time interval for writing the gratings by the grating array drawing tower.
As shown in fig. 2, the grating writing system for eliminating large-capacity grating array ghost in the embodiment of the present invention includes an excimer laser 2, a grating mask 3, a high-precision meter 1, and a controller 4, wherein:
an excimer laser 2 for grating writing of the optical fiber,
the grating mask plate 3 is used for controlling the wavelength of the writing grating;
the high-precision length counter 1 is connected with the excimer laser and the controller and is used for feeding back the advancing speed of the current optical fiber;
the controller 4 is used for setting the advancing speed of the optical fiber and calculating the current real-time speed of the optical fiber according to the feedback information of the high-precision meter counter so as to adjust the advancing speed of the optical fiber in real time; the controller is also configured to set the grating writing intervals such that the difference between adjacent intervals is not zero.
The high-precision length counter 1 is mainly used for accurately calculating the displacement distance of the optical fiber; the excimer laser 2 performs grating inscription; the grating mask plate 3 controls the wavelength of the writing grating; the controller 4 controls the resetting of the high-precision meter counter 1, the writing of the excimer laser 2 and the adjustment of the grating mask plate 3.
The high-precision length counter 1 can accurately calculate the displacement of the optical fiber through coding and axis recording, the measuring precision is 1mm, and the precision is not lower than the grating distance engraved by the excimer laser 2.
The excimer laser 2 comprises a laser and a feedback module, the laser performs inscription by receiving an instruction of the controller, and the feedback module feeds back the light-emitting power of the laser and the light spot quality of the grating mask plate to the controller through CCD imaging; the controller sends a fine adjustment instruction to the excimer laser and the grating mask plate according to a feedback result of the feedback module, and controls the excimer laser and the grating mask plate to perform fine adjustment.
The grating mask plate 3 is a transmission type glass material, light spots of a laser device write grating shapes in optical fibers through the grating mask plate 3, the grating mask plate 3 determines the wavelength of the gratings, the controller 4 can adjust the position of the grating mask plate 3 and can also switch the grating mask plate, and if the gratings with the same wavelength are written, the grating mask plate does not need to be switched.
The controller 4 is specifically configured to: adjusting a grating mask plate to a preset position, controlling an excimer laser to write a grating, clearing 0 of a code of a high-precision meter counter by a controller after writing, acquiring the current real-time position of the mask plate and the output power of the laser through a CCD (charge coupled device) feedback system of the excimer laser, and comparing and finely adjusting the current real-time position with the preset value; and when the code of the high-precision length counter reaches the preset grating writing interval, the controller controls the excimer laser to write the grating again and repeats the steps.
The controller 4 comprises an ARM processing chip and a plurality of serial port communication interfaces, the controller can obtain the current advancing speed of the optical fiber and accurately control the grating writing interval by receiving the coding information of the high-precision meter counter 1, and can accurately control the light emitting power of the laser and the position of a grating mask plate by receiving the information of the feedback device of the excimer laser 2. The controller 4 can control the advancing speed of the optical fiber, the light emitting power of the laser, the position of the mask plate and the writing of the grating.
The controller writes the grating with the same wavelength by adjusting the position of the grating mask plate; or different grating mask plates are switched to write gratings with different wavelengths.
The controller controls the time interval of grating writing of the grating array wire drawing tower, so that the distances between the gratings with the same wavelength are not completely equal.
The working flow of the system is shown in fig. 3, and the grating inscribing method for eliminating the ghost of the large-capacity grating array mainly comprises the following steps:
s1, the controller adjusts the advancing speed v of the optical fiber, the light emitting power P of the laser and the position S of the grating mask plate according to the feedback information, and the high-precision meter counter is set to be 0;
s2, generating random numbers within +/-10% multiplied by d based on the set grating writing interval d to obtain a new grating interval d';
s3, acquiring the coding information of the high-precision meter counter in real time;
s4, judging whether the high-precision meter counter code is equal to d';
s5, if the high-precision length counter code is equal to d', the excimer laser carries out grating inscription;
s6, the controller acquires the information of the excimer laser CCD feedback system
And S7, judging whether the number of the optical fiber inscriptions reaches a preset value or not according to the feedback information, if so, ending the program, otherwise, returning to the step S1 and repeating the steps.
In step S2, in order to eliminate the "ghost" phenomenon caused by multiple reflections at the same wavelength, the controller 4 specifically adds a random variable, generally 10% of the preset interval, to the preset grating writing interval, so as to not affect the use of the grating, but perfectly eliminate the effect of multiple reflections. I.e. the controller adds a random variable Δ d to the preset grating writing interval dnSo that the interval between two adjacent gratings is d' ═ d + Δ dn，ΔdnThe random value of (A) is between-0.1 d and 0.1 d.
The controller 4 is used for setting the advancing speed of the optical fiber, the current real-time speed is calculated through the feedback information of the high-precision meter measuring device 1, and the speed of the front motor can be adjusted in real time through a PID algorithm. The controller 4 adjusts the grating mask plate 3 to a preset position, controls the excimer laser 2 to write the grating, and after writing, the controller 4 clears the code of the high-precision length counter 1 to 0, obtains the current real-time position of the mask plate and the laser output power through a CCD feedback system of the excimer laser 2, and compares the current real-time position with the preset value and finely adjusts the current real-time position with the preset value. When the code of the high-precision length counter 1 reaches the preset grating writing interval, the controller 4 controls the excimer laser 2 to write the grating again and repeats the steps.
The working principle of this patent: because the light speed is fixed, when the paths of light reflected by the grating and reaching the PD detection end of the photoelectric detector are the same, the light can be simultaneously detected by the PD and superposed, the distance between the gratings is assumed to be d, the total path of light emitted by the laser reaching the 3 rd grating and reflected back to the PD end is assumed to be 6d, the total path is the same as the path of light emitted by the laser reaching the 2 nd grating and reflected to the 1 st grating and reflected again to reach the 2 nd grating and finally return to the PD detection end, the superposition can be carried out, and the reflectivity of a common grating is that
I.e. the 1 st order reflected return signal (reflected by 1 grating) is 10 of the incident signal-4And the return signal of 2-order reflection (reflected by 3 gratings) is 10 of the incident signal-12And the return signal of 3-order reflection (reflected by 5 gratings) is 10 of the incident signal-20The signal is too weak, so that the 3 rd order reflection can be not considered in the system, and only the influence of the 2 nd order reflection can be considered.
The 1 st order reflection, path S, of the nth grating is calculated from the path of the light from the source → the grating → the return PDnComprises the following steps:
Sn＝n×d×2
optical path and SnThe 2 nd order reflection of the same n-1 th grating comprises:
1) light source → n-1 grating → n-2 grating → n-1 grating → returning PD;
2) light source → n-1 st grating → n-3 rd grating → n-2 nd grating → returning PD;
3) light source → n-1 st grating → n-4 th grating → n-3 rd grating → returning PD;
……
4) light source → n-1 grating → 2 grating → 3 grating → return PD;
5) light source → n-1 st grating → 2 nd grating → return PD;
n-2 in total.
Optical path and SnThe 2 nd order reflection of the same n-2 nd grating comprises:
1) light source → n-2 grating → n-4 grating → n-2 grating → returning PD;
2) light source → n-2 grating → n-5 grating → n-3 grating → returning PD;
……
3) light source → n-1 st grating → 3 rd grating → return PD;
n-4 in total
Optical path and SnThe 2 nd order reflection of the same n-3 th grating comprises:
4) light source → n-3 grating → n-6 grating → n-3 grating → returning PD;
5) light source → n-3 grating → n-7 grating → n-4 grating → returning PD;
……
6) light source → n-3 grating → 1 grating → 4 grating → return PD;
n-6 in total
By analogy, the optical path length is equal to SnThe same 2 nd order reflection shares:
the optical paths of the 2 nd order reflections are n × d × 2, so the nth grating spectrum is overlappedPlus all optical paths as SnThe more the number of the gratings is, the more the ghost in the grating spectrum at the back end of the link is, and when the number of the gratings exceeds 10000, the intensity of 2-order reflected light can reach 10-12×108＝10-4On the order of magnitude, close to the strength of the true 1 st order reflected signal, the "ghosting" can severely interfere with the true signal and even cause erroneous demodulation.
The invention aims to change the distance d between the gratings, and after the n-1 grating is completely written, the controller 4 generates a random number delta d between-0.1 d and 0.1dn(precision mm order), the interval between the n-1 th grating and the nth grating is d + delta dn. I.e. the random numbers generated each time are substantially different, it can be ensured that the adjacent intervals are as different as possible.
At this time, the 1-time reflection optical path of the nth grating is as follows:
the 2-time reflection optical path of the (n-1) th grating is as follows:
1) light source → n-1 grating → n-2 grating → n-1 grating → return PD:
2) light source → n-1 st grating → n-3 rd grating → n-2 nd grating → return PD:
3) light source → n-1 st grating → n-4 th grating → n-3 rd grating → returning PD;
……
Δdnis a random number, generally the sameThe pitch d of the wavelength grating is of the order of magnitude and Δ dnIs determined by a high precision micrometer, with a precision of millimeters, thus Δ dnThe probability of two equal values is 1/200, the influence caused by multiple reflections can be reduced by 200 times, and the signal-to-noise ratio of the real signal and ghost shadow is improved by 23 dB.
In the embodiment, an ultra-high precision constant-voltage meter counter CCDP-30I and an excimer laser of LAMBDA PHYSIK company in Germany are selected, a 1550nm grating mask plate is customized, and a controller taking an ARM9 processing chip as a core is selected.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A grating inscribing method for eliminating ghost image of large-capacity grating array is characterized in that in the process of inscribing the grating array, the distance between any two adjacent gratings is changed, and the difference between adjacent intervals is not zero.
2. A grating writing method for eliminating large-capacity grating array ghost image according to claim 1, wherein a random variable Δ d is added during the writing of the grating arraynSo that the interval between two adjacent gratings is d + delta dnWhere d is a constant value, Δ dnThe random value of (a) is between-0.1 d and 0.1 d.
3. The grating writing method for eliminating large-capacity grating array ghost image according to claim 1, wherein in the grating writing process, the time interval for writing the grating by the grating array drawing tower is controlled, so that the distances between the gratings with the same wavelength are not completely equal.
4. The utility model provides an eliminate grating system of writing of grating of large capacity grating array "ghost", which characterized in that, includes excimer laser, grating mask board, high accuracy meter ware and controller, wherein:
an excimer laser for grating writing of the optical fiber,
the grating mask plate is used for controlling the wavelength of the writing grating;
the high-precision meter counter is connected with the excimer laser and the controller and is used for feeding back the advancing speed of the current optical fiber;
the controller is used for setting the advancing speed of the optical fiber and calculating the current real-time speed of the optical fiber according to the feedback information of the high-precision meter counter so as to adjust the advancing speed of the optical fiber in real time; the controller is also configured to set the grating writing intervals such that the difference between adjacent intervals is not zero.
5. The grating inscribing system for eliminating large-capacity grating array ghost image according to claim 4, characterized in that, the excimer laser includes a laser and a feedback module, the laser inscribes by receiving the instruction of the controller, the feedback module feeds back the light output power of the laser and the spot quality of the grating mask plate to the controller through CCD imaging; the controller sends a fine adjustment instruction to the excimer laser and the grating mask plate according to a feedback result of the feedback module.
6. The grating inscribing system for eliminating large volume grating array "ghosting" of claim 4, wherein the controller is specifically configured to: adjusting a grating mask plate to a preset position, controlling an excimer laser to write a grating, clearing 0 of a code of a high-precision meter counter by a controller after writing, acquiring the current real-time position of the mask plate and the output power of the laser through a CCD (charge coupled device) feedback system of the excimer laser, and comparing and finely adjusting the current real-time position with the preset value; and when the code of the high-precision length counter reaches the preset grating writing interval, the controller controls the excimer laser to write the grating again and repeats the steps.
7. A system for grating writing to eliminate ghost of large volume grating array as in claim 4, wherein the controller adds a random variable Δ d to the predetermined grating writing interval dnTo makeThe interval between two adjacent gratings is d + delta dn，ΔdnThe random value of (a) is between-0.1 d and 0.1 d.
8. The system of claim 7, wherein the controller is configured to write gratings of the same wavelength by adjusting the position of the grating mask; or different grating mask plates are switched to write gratings with different wavelengths.
9. The grating inscription system for removing large volume grating array "ghosting" as in claim 4, wherein the controller controls the time interval for inscribing the grating by the grating array drawing tower so that the distances between gratings of the same wavelength are not exactly equal.
10. A grating writing method for eliminating ghost of large-capacity grating array, which is based on the grating writing system for eliminating ghost of large-capacity grating array of any one of claims 4-9, and comprises the following steps:
s1, the controller adjusts the advancing speed v of the optical fiber, the light emitting power P of the laser and the position S of the grating mask plate according to the feedback information, and the high-precision meter counter is set to be 0;
s2, based on the set grating writing interval d, generating random number delta d within + -10% multiplied by dnObtaining a new grating interval d' = d + delta dn；
S3, acquiring the coding information of the high-precision meter counter in real time;
s4, judging whether the code of the high-precision meter counter is equal to d';
s5, if the high-precision length counter code is equal to d', the excimer laser carries out grating inscription;
s6, the controller acquires feedback information of the excimer laser;
and S7, judging whether the number of the optical fiber inscriptions reaches a preset value or not according to the feedback information, if so, ending the program, and otherwise, returning to the step S1.
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|---|---|---|---|---|
| CN103512599A (en) * | 2013-09-27 | 2014-01-15 | 武汉理工大学 | Ultra-large capacity fiber Bragg grating sensing system based on light amplification relay |
| CN104678486A (en) * | 2015-03-17 | 2015-06-03 | 武汉理工大学 | Preparation method of fiber grating |
| CN105783956A (en) * | 2016-05-16 | 2016-07-20 | 武汉理工大学 | Large-capacity weak grating array processing apparatus and method |
| CN208111909U (en) * | 2018-01-12 | 2018-11-16 | 中国计量大学 | Random fiber laser based on Sagnac ring and opposite chirped fiber grating string |
| US20200088936A1 (en) * | 2016-12-22 | 2020-03-19 | Fbgs Technologies Gmbh | Draw tower grating production method and system |
| CN111208602A (en) * | 2020-01-21 | 2020-05-29 | 武汉理工大学 | Device and method for preparing weak grating array with continuous wavelength change on line |
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2021
- 2021-03-23 CN CN202110306316.3A patent/CN113064233A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512599A (en) * | 2013-09-27 | 2014-01-15 | 武汉理工大学 | Ultra-large capacity fiber Bragg grating sensing system based on light amplification relay |
| CN104678486A (en) * | 2015-03-17 | 2015-06-03 | 武汉理工大学 | Preparation method of fiber grating |
| CN105783956A (en) * | 2016-05-16 | 2016-07-20 | 武汉理工大学 | Large-capacity weak grating array processing apparatus and method |
| US20200088936A1 (en) * | 2016-12-22 | 2020-03-19 | Fbgs Technologies Gmbh | Draw tower grating production method and system |
| CN208111909U (en) * | 2018-01-12 | 2018-11-16 | 中国计量大学 | Random fiber laser based on Sagnac ring and opposite chirped fiber grating string |
| CN111208602A (en) * | 2020-01-21 | 2020-05-29 | 武汉理工大学 | Device and method for preparing weak grating array with continuous wavelength change on line |
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