AU2020100905A4 - A FBG writing system and method for any shaped and distribution of optical fiber cores - Google Patents
A FBG writing system and method for any shaped and distribution of optical fiber cores Download PDFInfo
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- AU2020100905A4 AU2020100905A4 AU2020100905A AU2020100905A AU2020100905A4 AU 2020100905 A4 AU2020100905 A4 AU 2020100905A4 AU 2020100905 A AU2020100905 A AU 2020100905A AU 2020100905 A AU2020100905 A AU 2020100905A AU 2020100905 A4 AU2020100905 A4 AU 2020100905A4
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4212—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element being a coupling medium interposed therebetween, e.g. epoxy resin, refractive index matching material, index grease, matching liquid or gel
-
- 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
- G02B6/02133—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference
- G02B6/02138—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference based on illuminating a phase mask
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention proposes a Fiber Bragg grating (FBG) writing system and method for any shaped
and distribution of optical fiber cores, its characteristics are: the system includes an optical
platform, an excimer laser, mirrors, an aperture, beam expanders, a cylindrical lens, a FBG
writing device, optical fiber clamps, an optical fiber V groove holder and a fiber-optic grating
writing online monitoring system. The FBG writing device includes right angle prisms, a phase
mask and a fiber substrate, the fiber substrate has a reservoir and U-shaped slots for storing index
matching fluids and placing the fibers to be written, eliminating the effects of curved fiber
surfaces and air medium on the writing beam. The invention can effectively improve the FBG
writing effect and efficiency of fibers whose cores are of any shape and distribution.
1/2
DRAWINGS
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FIG. 1
•C)
(a) ( b)
( c) ( d)
FIG. 2
Description
1/2 DRAWINGS
/2 10 8
3 Z45
I 18 10
1007
FIG. 1
(a) ( b)
( c) ( d) FIG. 2
A FBG writing system and method for any shaped and distribution of optical fiber cores
[0001] The invention relates to the field of optical fiber Fiber Bragg grating (FBG) writing
system and method, specifically a FBG writing system and method for any shaped and
distribution of optical fiber cores.
[0002] An optical fiber grating refers to a grating structure that is formed by constructing
periodic changes in refractive index on an optical fiber core by certain technical means. Fiber
Bragg grating (FBG) written on the single-mode is the most mature research on optical fiber
grating, this type of grating has excellent optical narrowband filtering characteristics and sensing
characteristics, and has a wide range of applications in the field of optoelectronics and fiber
sensing field. In recent years, in order to meet the needs of communication and sensing, many
special optical fibers have been designed and produced, such as few-mode optical fibers,
multi-core optical fibers, annular core optical fibers, multi-cladding optical fibers, and etc.
Researches on the grating characteristics of special optical fibers are also increasing year by year,
such as: Ying Wei (WEI Y, JIAO M X. An experimental study on the sensing characteristics of
Bragg grating of polarization maintaining optical fibers[J]. Infrared and Laser Engineering,
2008(37):107-110.) points out that the FBG written on the fast and slow axes of the polarization
maintaining optical fibers have different transverse load sensitivity, which can be applied to
weighing and other fields. Wei Jia Bao (BAO W J. A study of a new optical fiber Bragg grating
vector strain sensor [D]. Northwestern University, 2018.) studies and achieves the vector strain
measuring of writing FBG on multi-cladding optical fibers. E. Lindley (LINDLEY E, MIN S-S,
LEON-SAVAL S, et al. Demonstration of uniform multicore fiber Bragg gratings[J]. Optics
Express, 2014, 22(25):31575.) carries out research on multi-core optical fiber FBG writing
techniques, the FBG can be used to suppress noise signals in space exploration and have very
important application prospects in the field of astrophotonics.
[0003] Phase mask method is a widely used FBG writing method, which usually uses
Ultraviolet(UV)-irradiated phase mask to form diffraction fringes, and the FBG can be prepared
using 1l order diffraction fringe side exposing photosensitive optical fibers. The method
significantly reduces the requirement for the coherence of the UV optical source, and the Bragg
wavelength of the prepared FBG depends only on the stripe period of the phase mask, thus
reducing the difficulty of the FBG preparation process. The phase mask method based on UV
laser is the most commonly used FBG preparation method, laying the foundation for the practical
and industrialization of FBG.
[0004] UV laser-based phase mask methods have also been attempted for FBG writing of special
optical fibers, but the writing result is much less effective than for single-mode optical fibers,
where the waveguide fiber core of the special fiber may not necessarily be in the center of the
fiber, but may be distributed over the entire fiber cross-section. Such as multi-mode optical fiber,
few-mode optical fiber, multi-core optical fiber, annular core optical fiber, multi-core optical
fiber, etc. The optical fiber has a cylindrical curved surface structure, and in the process of
writing, the optical fiber is exposed to air, the refractive index of air and the optical fiber
cladding differs greatly (air refractive index is 1, optical fiber cladding refractive index is about
1.46). Therefore, the written beam produces convergence phenomenon after entering the optical
fiber, resulting in uneven distribution of optical intensity in the opticalfiber cross-section. This uneven distribution of optical intensity has little effect on the optical fiber core area when it is small; simply cover the fiber core with maximum optical intensity area. However, for the special optical fibers mentioned above, it is difficult to achieve uniform illumination over the entire core area. The unevenness of the illumination results in uneven refractive index modulation, which ultimately results in poor results for this type of optical fiber FBG writing.
[0005] To address the above, two approaches are currently available.
[0006] (1) The literature (E. Lindley, S.-S. Min, S. Leon-Saval, N. Cvetojevic, J. Lawrence, S. Ellis, and J. Bland-Hawthorn, "Demonstration of uniform multicore fiber Bragg gratings," Opt. Express 22, 31575 (2014). ) proposes a FBG writing method suitable for multicore fibers: first, a suitable section of quartz capillary is selected, one side of the capillary is grind to a certain thickness then polish, the fiber to be written is inserted into the capillary, and the FBG is prepared by illuminating the written light from the side throw.
[0007] (2) Patent Grant Notice No. CN 106249348 B proposes a method of apodized FBG FBG writing method; this method rotates the optical fiber to be written, to eliminate the modulation asymmetry of the optical refractive index due to the large core diameter.
[0008] In the methods described above, the process of side-throwing of the quartz capillary is complex, and the processing time is long. In order for the optical fiber to be inserted into the capillary, the inner diameter of the capillary is necessary to be larger than the diameter of the optical fiber, and the air filled between the two will still have an effect on the writing results. Rotate the optical fiber to be written while FBG writing, the subtle asymmetry of the optical path or the slight vibration of the rotating motor will affect the writing effect of the grating.
[0009] The objective of the invention is to provide a FBG writing system and method for any
shaped and distribution of optical fiber cores.
[0010] The objective of the invention is achieved as follows:
[0011] The invention is a FBG writing system for any shaped and distribution of optical fiber
cores, it includes an optical platform, an excimer laser, mirrors, an aperture, beam expanders, a
cylindrical lens, a FBG writing device, optical fiber clamps, an optical fiber V groove holder and
a fiber-optic grating writing online monitoring system. The mirrors are installed on the optical
platform to adjust the height and position of the output beam of the excimer laser. The aperture,
the beam expanders, the cylindrical lens and the FBG writing device are arranged on the optical
platform along the direction of the output beam of the mirrors in sequence. The FBG writing
device includes right angle prisms, a phase mask and afiber substrate, the horizontal writing
beam from the cylindrical lens is adjusted to the vertical direction by the right angle prisms, and
the phase mask and the fiber substrate are illuminated in turn. The fiber substrate has a reservoir
for storing the index matching fluid; the reservoir has a pair of U-shaped slots, used to place the
fibers to be written. The fiber-optic grating writing online monitoring system includes a
broadband light source, a spectrometer, an optical fiber circulator, and a 1x2 optical switch; this
can achieve the real-time monitoring of the transmission and reflection spectra of the optical
fiber to be written during the writing process.
[0012] The fiber substrate, the material used has a high transmittance in the UV light band for
writing, the lower part of the fiber substrate is a rectangular slice, the slice thickness is 50
micrometers, the length and width are equal to the phase mask. The upper part of the fiber
substrate is a reservoir; the size of the outer part of the reservoir is smaller than the slice on the lower part. The reservoir storage area in the reservoir is larger than the grating size of the phase mask, to ensure that the diffraction light formed by the phase mask can enter the reservoir through the slice. The reservoir's depth is larger than the diameter of the cladding of the optical fiber to be written. The reservoir has a pair of U-shaped slots along the direction of the gating period of the phase mask. The width and depth of the U-shaped slots are slightly larger than the diameter of the cladding of the optical fiber to be written, to ensure that the optical fiber to be written can be put into the U-shaped slots.
[0013] In the FBG writing device, the lower surface of thefiber substrate attaches the upper
surface of the phase mask and is fixed, and the distance between the phase mask and the right
angle prisms is adjustable.
[0014] The index matching fluid uses water as a solvent and glycerol as a solute, and has a high
transmittance for writing the UV light band. It can obtain a refractive index consistent with the
optical fiber cladding by precisely controlling the ratio of water to glycerol.
[0015] The optical fiber clamps are placed on both sides of the FBG writing device, the height is
kept uniform with the U-shaped slots of the fiber substrate, to fix the optical fiber to be written.
[0016] The fiber-optic grating writing online monitoring system, wherein the broadband light
source output is connected to the optical fiber circulator port 1, the optical fiber circulator port 3
is connected to the optical switch input port 1. The optical switch output port is connected to the
spectrometer input, and the connection is made with optical fiber patch cables, the circulator port
2 being the output/reflection input of the optical fiber FBG writing monitoring system and the
optical switch input port 2 being the transmission input of the optical fiber FBG writing
monitoring system.
[0017] The invention a FBG writing method for any shaped and distribution of optical fiber cores includes the following steps:
[0018] Step 1: Set the excimer laser frequency and energy parameters, adjust the distance between the FBG writing device and the cylindrical lens, and the distance between the phase mask and the right angle prisms in the FBG writing device, so that the writing beam emitted by the cylindrical lens can focus on the U-shaped slots in the fiber substrate.
[0019] Step 2: Peel off the optical fiber coating layer of the area to be written of the optical fiber to be written, peel off a length greater than the length of the reservoir of the fiber substrate. Wipe clean with alcohol, straighten the optical fiber ends with slight force and fix it in the opticalfiber clamps, to ensure that the optical fiber to be written completely sinks in the reservoir.
[0020] Step 3: Take an appropriate amount of the index matching fluid and drop into the reservoir of the fiber substrate, the index matching fluid should completely submerge the optical fiber in the reservoir.
[0021] Step 4: Connect both ends of the fiber to be written, to the output/reflection input end and the transmission input end of the fiber-optic grating writing online monitoring system via the optical fiber V groove holder;
[0022] Step 5: Start the excimer laser to output, start the fiber-optic grating writing online monitoring system, through controlling the optical switch to monitor the grating reflection and transmission spectrum, respectively. When the optical fiber to be written meets the FBG writing requirements, stop the output of the excimer laser, turn off thefiber-optic grating writing online monitoring system.
[0023] Step 6: Open the optical fiber V groove holder, disconnect the written optical fiber from
the fiber-optic grating writing online monitoring system, open the optical fiber clamps, remove
the optical fiber from the FBG writing device and complete the FBG writing.
[0024] The advantages of the invention over the prior arts are:
[0025] (1) The use of an index matching fluid eliminates the difference in refractive index inside
and outside the optical fiber and avoids the beam convergence effect, making the written light
more widely distributed across the optical fiber cross-section. The optical intensity is more
uniformly distributed to satisfy the optical fiber FBG writing for any shaped and distribution of
optical fiber cores.
[0026] (2) The fiber substrate in the FBG writing device can be produced by the existing C02
laser processing system, the production time is short and the processing accuracy is guaranteed;
[0027] (3) Simple operation steps enable fast FBG writing
[0028] FIG. 1 is a schematic diagram of a FBG writing system for any shaped and distribution of
optical fiber cores;
[0029] FIG. 2 shows some optical fiber types that the invention is applicable to: (a) a schematic
diagram of a single-mode optical fiber structure, (b) a schematic diagram of a multi-mode optical fiber structure, (c) a schematic diagram of an annular core optical fiber structure, and (d) a schematic diagram of a multi-core optical fiber structure;
[0030] FIG. 3 is the schematic diagram of the structure of a FBG writing device;
[0031] FIG. 4 is the schematic diagram of the structure of afiber-optic grating writing online monitoring system;
[0032] In the figures: 1-an excimer laser, 2-mirrors, 3-an aperture, 4-beam expanders, 5-a cylindrical lens, 6-a FBG writing device, 7-a fiber-optic grating writing online monitoring system, 8-optical clamps, 9-an optical fiber to be written, 10-optical fiber V groove holder, 11-a writing beam, 100-an optical platform, 601-right angle prisms, 602-a phase mask, 603-a fiber substrate, 604-optical matching fluids, 701-a broadband light source, 702-a spectrometer, 703-an optical fiber circulator, 704-a 1x2 optical switch, 705-an output/reflection input, 706-a transmission input.
[0033] The invention proposes a FBG writing system and method for any shaped and distribution of optical fiber cores. FIG. 2 enumerates some of the optical fibers to which the invention is applicable. The choice of optical fibers has no effect on the preparation device and preparation method of the invention, and therefore the specific type of optical fibers is not specified in the following embodiments.
[0034] The following combination of the drawings and specific embodiments describes in further detail a FBG writing system for any shaped and distribution of optical fiber cores.
[0035] As shown in FIG. 1, a FBG writing system for any shaped and distribution of optical fiber cores, it includes an optical platform 100, an excimer laser 1, mirrors 2, an aperture 3, beam expanders 4, a cylindrical lens 5, a FBG writing device 6, optical fiber clamps 8, an optical fiber V groove holder 10 and a fiber-optic grating writing online monitoring system 7. The mirrors 2 are installed on the optical platform 100 to adjust the height and position of the output beam 11 of the excimer laser. The aperture 3, the beam expanders 4, the cylindrical lens 5 and the FBG writing device 6 are arranged on the optical platform 100 along the direction of the output beam 11 of the mirrors 2 in sequence.
[0036] As shown in FIG. 3, the FBG writing device 6 includes right angle prisms 601, a phase mask 602 and an fiber substrate 603, the horizontal writing beam 11 is adjusted to the vertical direction by the right angle prisms 601, and illuminated on the optical fiber to be written 9 through the phase mask 602 and the fiber substrate 603 in turn.
[0037] As shown in FIG. 3, the fiber substrate 603, the material used has a high transmittance in the UV light band for writing, the lower part of the fiber substrate 603 is a rectangular slice, the slice thickness is 50 micrometers, the length and width are no less than of the phase mask 602. The upper part of the fiber substrate is a reservoir; the size of the outer part of the reservoir is smaller than the slice on the lower part. The reservoir storage area in the reservoir is larger than the grating size of the phase mask 602, to ensure that the diffraction light formed by the phase mask can enter the reservoir through the slice. The reservoir's depth is larger than the diameter of the cladding of the optical fiber to be written 9. The reservoir has a pair of U-shaped slots along the direction of the gating period of the phase mask, the width and depth of the U-shaped slots are slightly larger than the diameter of the cladding of the optical fiber to be written 9, so as to ensure that the optical fiber to be written 9 can be put into the U-shaped slots.
[0038] As shown in FIG. 3, the index matching fluid 604 uses water as a solvent and glycerol as
a solute, and has a high transmittance for writing the UV light band. It can obtain a refractive
index consistent with the optical fiber cladding by precisely controlling the ratio of water to
glycerol.
[0039] A FBG writing method for any shaped and distribution of optical fiber cores includes the
following steps:
[0040] Step 1, System Adjustment and Setting: Set the excimer laser 1 frequency and energy
parameters, adjust the distance between the FBG writing device 6 and the cylindrical lens 5, and
the distance between the phase mask 602 and the right angle prisms 601 in the FBG writing
device 6, so that the writing beam emitted by the cylindrical lens 5 can focus on the U-shaped
slots in the fiber substrate 603.
[0041] Step 2, Prepare the Optical Fiber: Peel off the optical fiber coating layer of the area to be
written of the optical fiber to be written 9, peel off a length greater than the length of the
reservoir of the fiber substrate 603. Wipe clean with alcohol, straighten the optical fiber ends
with slight force and fix it in the optical fiber clamps 8, to ensure that the optical fiber to be
written 9 completely sinks in the reservoir.
[0042] Step 3, Inject Index Matching Fluid: Take an appropriate amount of the index matching
fluid 604 and drop into the reservoir of the fiber substrate, the index matching fluid should
completely submerge the optical fiber to be written 9 in the reservoir.
[0043] Step 4, Connect Optical Paths: Connect both ends of the fiber to be written 9, to the
output/reflection input end 705 and the transmission input end 706 of the fiber-optic grating writing online monitoring system 7 via the optical fiber V groove holder 10;
[0044] Step 5, FBG Writing: Start the excimer laser 1 to output, start the fiber-optic grating
writing online monitoring system 7, through controlling the optical switch 704 to monitor the
grating reflection and transmission spectrum, respectively. When the optical fiber to be written 9
meets the FBG writing requirements, stop the output of the excimer laser 1, turn off the
fiber-optic grating writing online monitoring system 7.
[0045] Step 6, Finish Writing: Open the optical fiber V groove holder 10, disconnect the written
optical fiber 9 from the fiber-optic grating writing online monitoring system 7, open the optical
fiber clamps 603, remove the optical fiber from the FBG writing device 6 and complete the FBG
writing.
Claims (5)
1. A Fiber Bragg grating (FBG) writing system for any shaped and distribution of optical
fiber cores, its characteristics are: the system includes an optical platform, an excimer laser,
mirrors, an aperture, beam expanders, a cylindrical lens, a FBG writing device, optical fiber
clamps, an optical fiber V groove holder and afiber-optic grating writing online monitoring
system. The mirrors in the system are installed on the optical platform to adjust the height and
position of the output beam of the excimer laser. The aperture, the beam expanders, the
cylindrical lens and the FBG writing device in the system are arranged on the optical platform
along the direction of the output beam of the mirrors in sequence. The FBG writing device in the
system includes right angle prisms, a phase mask and a fiber substrate, the fiber substrate has a
reservoir for storing the index matching fluid, the reservoir has U-shaped slots on both sides,
used to place the fibers to be written. The optical fiber clamps in the system are installed on both
sides of the FBG writing device, they are used to fix the optical fiber to be written. The optical
fiber V groove holder in the system is used to connect the optical fiber to be written and the
fiber-optic grating writing online monitoring system. The fiber-optic grating writing online
monitoring system in the system includes a broadband light source, a spectrometer, an optical
fiber circulator, and a 1x2 optical switch.
2. As claimed in claim 1, the fiber substrate, its characteristics are: the material used has a
high transmittance in the ultraviolet light band for writing, the lower part of the fiber substrate is
a rectangular slice, the slice thickness is 50 micrometers, the length and width are equal to the
phase mask. The upper part of the fiber substrate is a reservoir, the size of the outer part of the
reservoir is smaller than the slice on the lower part, and the reservoir storage area in the reservoir
is larger than the grating size of the phase mask. The reservoir has U-shaped slots on both sides
along the direction of the gating period of the phase mask; the width and depth of the U-shaped
slots are slightly larger than the diameter of the optical fiber cladding to be written, so as to
ensure that the optical fiber to be written can be put into the U-shaped slots.
3. As claimed in claim 1, the FBG writing device, its characteristics are: the lower surface of
the fiber substrate attaches the upper surface of the phase mask and is fixed, and the distance
between the phase mask and the right angle prisms is adjustable.
4. As claimed in claim 1, the index matching fluid, its characteristics are: it uses water as a
solvent and glycerol as a solute, and has a high transmittance for writing the ultraviolet light
band. It can obtain a refractive index consistent with the optical fiber cladding by precisely
controlling the ratio of water to glycerol.
5. A FBG writing method for any shaped and distribution of optical fiber cores, its
characteristics are: it includes the following steps:
Step 1: Set the excimer laser frequency and energy parameters, adjust the distance
between the FBG writing device and the cylindrical lens, and the distance between the
phase mask and the right angle prisms in the FBG writing device, so that the writing
beam emitted by the cylindrical lens can focus on the U-shaped slots in the fiber
substrate;
Step 2: Peel off the optical fiber coating layer of the area to be written of the optical fiber
to be written, peel off a length greater than the length of the reservoir of the fiber
substrate. Wipe clean with alcohol, straighten the optical fiber ends with slight force and
fix it in the optical fiber clamps, to ensure that the optical fiber to be written completely
sinks in the reservoir.
Step 3: Take an appropriate amount of the index matching fluid and drop into the
reservoir of the fiber substrate, the index matching fluid should completely submerge the
optical fiber in the reservoir.
Step 4: Connect both ends of the fiber to be written, to the output/reflection input end and
the transmission input end of thefiber-optic grating writing online monitoring system via
the optical fiber V groove holder;
Step 5: Start the excimer laser to output, start the fiber-optic grating writing online
monitoring system, through controlling the optical switch to monitor the grating reflection and transmission spectrum, respectively. When the optical fiber to be written meet the FBG writing requirements, stop the output of the excimer laser, turn off the fiber-optic grating writing online monitoring system. Step 6: Open the optical fiber V groove holder, disconnect the written optical fiber from the fiber-optic grating writing online monitoring system, open the optical fiber clamps, remove the optical fiber from the FBG writing device and complete the FBG writing.
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| Application Number | Priority Date | Filing Date | Title |
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| AU2020100905A AU2020100905A4 (en) | 2020-06-01 | 2020-06-01 | A FBG writing system and method for any shaped and distribution of optical fiber cores |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020100905A AU2020100905A4 (en) | 2020-06-01 | 2020-06-01 | A FBG writing system and method for any shaped and distribution of optical fiber cores |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740949A (en) * | 2021-09-10 | 2021-12-03 | 武汉锐科光纤激光技术股份有限公司 | Optical path adjusting system and optical path adjusting method |
| WO2022165960A1 (en) * | 2021-02-02 | 2022-08-11 | 深圳大学 | Fiber grating manufacturing method and manufacturing device capable of regulating birefringence |
| CN116088090A (en) * | 2023-03-29 | 2023-05-09 | 北京工业大学 | System for writing 2-micrometer large-mode-field fiber bragg grating based on mask method and working method |
-
2020
- 2020-06-01 AU AU2020100905A patent/AU2020100905A4/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022165960A1 (en) * | 2021-02-02 | 2022-08-11 | 深圳大学 | Fiber grating manufacturing method and manufacturing device capable of regulating birefringence |
| CN113740949A (en) * | 2021-09-10 | 2021-12-03 | 武汉锐科光纤激光技术股份有限公司 | Optical path adjusting system and optical path adjusting method |
| CN113740949B (en) * | 2021-09-10 | 2023-10-17 | 武汉锐科光纤激光技术股份有限公司 | Optical path adjusting system and optical path adjusting method |
| CN116088090A (en) * | 2023-03-29 | 2023-05-09 | 北京工业大学 | System for writing 2-micrometer large-mode-field fiber bragg grating based on mask method and working method |
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