CN111552024A - Special-shaped core fiber grating preparation technology based on 120-degree included angle reflection exposure superposition - Google Patents

Special-shaped core fiber grating preparation technology based on 120-degree included angle reflection exposure superposition Download PDF

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CN111552024A
CN111552024A CN202010233353.1A CN202010233353A CN111552024A CN 111552024 A CN111552024 A CN 111552024A CN 202010233353 A CN202010233353 A CN 202010233353A CN 111552024 A CN111552024 A CN 111552024A
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optical fiber
grating
phase mask
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shaped groove
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汪杰君
胡挺
苑立波
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Guilin University of Electronic Technology
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02Optical fibres with cladding with or without a coating
    • G02B6/02057Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/02123Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
    • G02B6/02133Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference
    • G02B6/02138Refractive 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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  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
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Abstract

The invention provides a device and a method for preparing a special-shaped core fiber grating based on reflection exposure superposition with an included angle of 120 degrees, wherein the device comprises a phase mask plate, a quartz slice, a fiber support plate and fiber matching liquid, wherein one surface of the fiber support plate is provided with a V-shaped groove plated with a metal reflection film and used for placing an optical fiber to be inscribed, the quartz slice covers the fiber support plate, the phase mask plate covers the quartz slice, and the fiber matching liquid is used for filling a gap between the V-shaped groove on the fiber support plate and the optical fiber to be inscribed. The method comprises the steps of device installation, device adjustment, optical fiber preparation, grating inscription, preparation completion and the like, can effectively improve the light intensity distribution of an inscription beam in the cross section of the optical fiber, and is suitable for grating inscription of various special-shaped core optical fibers.

Description

Special-shaped core fiber grating preparation technology based on 120-degree included angle reflection exposure superposition
(I) technical field
The invention relates to the technical field of fiber grating preparation, in particular to a fiber grating preparation technology suitable for a special-shaped core fiber.
(II) background of the invention
The optical fiber grating refers to a grating structure formed by constructing a periodic variation of refractive index on an optical fiber core by a certain technical means. The Fiber Bragg Grating (FBG) engraved on a single-mode fiber is the most mature fiber bragg grating currently studied, and the fiber bragg grating has excellent optical narrow-band filtering characteristics and sensing characteristics and has wide application in the fields of photoelectron and fiber sensing. In recent years, in order to meet the requirements of communication and sensing, many special optical fibers are designed and manufactured, such as few-mode optical fibers, multi-core optical fibers, ring-core optical fibers, multi-clad optical fibers, and the like, and research on grating characteristics of the special optical fibers is also increasing year by year, for example: wei Ying (Wei Ying, Focus Star, Experimental study of sensing characteristics of polarization maintaining fiber Bragg grating [ J ] Infrared and laser engineering, 2008 (37): 107-; bervek (bervek. novel fiber bragg grating vector strain sensor research [ D ]. northwest university, 2018.) studies to write FBGs on multi-clad fibers and realize vector strain measurement; research on the FBG inscription technology of the multi-core fiber is carried out by Lindley (Lindley E, MIN S-S, LEON-SAVAL S, et al. Demonstroration of unicomplex fiber Bragg gratings [ J ]. Optics Express,2014,22(25):31575.), and the FBG can be used for inhibiting noise signals in space exploration and has very important application prospect in the field of celestial photonics.
The phase mask method is a widely used fiber grating writing method at present, and generally, the method uses ultraviolet light to irradiate the phase mask plate to form diffraction fringes and utilizes the side surfaces of the diffraction fringes of +/-1 order to expose photosensitive fibers to prepare the FBG. The method greatly reduces the requirement on the coherence of the light source, and the Bragg wavelength of the prepared FBG only depends on the fringe period of the phase mask plate, thereby reducing the difficulty of the grating preparation process. The phase mask plate method based on the ultraviolet laser is used as the most commonly adopted FBG preparation method, and lays a foundation for the practicability and industrialization of FBGs.
The phase mask method based on ultraviolet laser is also tried to be used for grating writing of special optical fibers, but because the structure of the special optical fibers is greatly different from that of single-mode optical fibers, part of the special optical fibers belong to special-shaped core optical fibers, namely waveguide fiber cores of the special optical fibers are not positioned in the center of the optical fibers, but distributed in the whole optical fiber interface. Therefore, when the phase mask plate is adopted to prepare the fiber grating, due to the cylindrical lens effect of the fiber, the +/-1-order diffracted beams emitted from the mask plate are difficult to form uniform light intensity distribution on the whole cross section of the fiber, so that the fiber grating with high quality is difficult to prepare.
To solve the above problems, two methods are currently available:
(1) an improved process is proposed in the literature (LINDLEY E, MIN S-S, LEON-SAVAL S, et al. Demonstroration of unidentified nuclear fiber gratings [ J ]. Optics Express,2014,22(25): 31575.): selecting a section of quartz capillary with proper size, polishing one side of the capillary after polishing the capillary to a certain thickness, inserting the optical fiber to be inscribed into the capillary, and irradiating the diffracted light beam of the phase mask plate from the side polished surface of the capillary to eliminate the cylindrical lens effect of the optical fiber.
(2) The patent (grant No. CN 106249348B) proposes an apodized fiber grating writing method, which suggests to rotate the fiber to be written while writing the grating, eliminating the asymmetry of the light-sensitive refractive index modulation due to the large core diameter.
In the method (1), the process of side polishing the quartz capillary is complex, the processing time is long, the inner diameter of the capillary is inevitably larger than the diameter of the optical fiber in order to insert the optical fiber into the capillary, and the air filled between the capillary and the optical fiber still influences the writing result; in the method (2), the fiber to be inscribed is rotated while the FBG is inscribed, and the inscription effect of the FBG can be influenced by slight asymmetry of the light path or slight vibration of the rotating motor.
Disclosure of the invention
The invention aims to provide a technology for preparing a special-shaped core fiber grating based on reflection exposure superposition at an included angle of 120 degrees. The technology can uniformly write the distribution of the light beams in the optical fiber and improve the grating writing quality.
The purpose of the invention is realized as follows:
the invention relates to a grating preparation device suitable for special-shaped core optical fibers, which consists of a phase mask plate, a quartz slice, an optical fiber carrier plate and optical fiber matching liquid, wherein one surface of the optical fiber carrier plate is provided with a V-shaped groove used for placing optical fibers to be engraved and written;
the phase mask plate can be selected from various phase mask plates for FBG writing;
the length and the width of the quartz slice are not less than those of the phase mask plate, the thickness of the quartz slice is 50 micrometers, the quartz slice is made of quartz glass, has high transmissivity in an ultraviolet light wave band for writing, can transmit diffraction light beams generated by the phase mask plate to an optical fiber carrier plate at the lower layer in a lossless manner, and simultaneously protects the phase mask plate from being polluted by an optical fiber to be written and optical fiber matching liquid on the optical fiber carrier plate;
the length and the width of the optical fiber carrier plate are not less than those of a quartz slice, the used material has high transmittance in an ultraviolet light wave band for writing, a V-shaped groove is arranged in the central area of one surface of the carrier plate, the groove direction is consistent with the periodic direction of a phase mask grid, metal reflecting films are plated on two side surfaces of the groove, the ultraviolet light wave band for writing has high reflectance, the included angle of the two side surfaces of the groove is 120 degrees, the groove depth H and the groove width W are determined by the diameter D of an optical fiber cladding to be written, and the calculation formula is as follows:
Figure BDA0002430062840000031
the optical fiber matching fluid takes water as a solvent and glycerol as a solute, has high transmittance to an ultraviolet band for writing, and obtains the refractive index consistent with the optical fiber cladding by accurately controlling the proportion of the water and the glycerol.
The invention discloses a grating preparation method suitable for a special-shaped core optical fiber, which comprises the following steps:
step 1, device installation: placing the grating preparation device in a grating writing platform, and adjusting writing light beams to vertically irradiate a phase mask plate of the grating preparation device from top to bottom;
step 2, device adjustment: removing a phase mask plate and a quartz slice of the grating preparation device, and adjusting the position and the height of the optical fiber carrier plate to focus the writing ultraviolet light beam in a V-shaped groove of the optical fiber carrier plate;
step 3, preparing an optical fiber: stripping a coating layer of a region to be engraved on an optical fiber to be engraved, wherein the stripping length is greater than the length of a V-shaped groove of an optical fiber support plate, wiping the coating layer with alcohol, putting the coating layer into the V-shaped groove, dropping a proper amount of optical fiber matching liquid, slightly moving the optical fiber to be engraved to enable the optical fiber matching liquid to completely fill a gap between the V-shaped groove and the optical fiber to be engraved, covering a quartz thin plate on the optical fiber support plate and ensure that air between the quartz thin plate and the optical fiber to be engraved is removed, covering a phase mask plate on the quartz thin plate, fixing the optical fiber to be engraved by using an optical fiber clamp, and connecting the optical fiber to be engraved with an;
step 4, grating inscribing: starting a laser to perform grating inscription, observing the grating inscription effect by using an online grating inscription monitoring system, and closing the laser and the online grating inscription monitoring system after the grating meets the inscription requirement;
and 5, finishing preparation: and disconnecting the optical fiber from the grating writing online monitoring system, removing the phase mask plate and the quartz slice of the grating preparation device, and taking out the optical fiber from the V-shaped groove of the optical fiber support plate to finish grating preparation.
Compared with the prior art, the invention has the advantages that:
(1) the optical fiber matching fluid is used, so that the convergence effect of the light beam after entering the optical fiber is eliminated, the distribution area of the writing light beam on the cross section of the optical fiber is wider, and the light intensity distribution is more uniform;
(2) the reflecting film of the V-shaped groove improves the utilization rate of the writing light beam, realizes the irradiation of the optical fiber from three directions, and further improves the distribution and the intensity of the writing light beam in the cross section of the optical fiber;
(3) the engraving device can be manufactured by the existing micromachining technology, the manufacturing period is short, and the machining precision is high;
(4) the operation steps of the engraving process are simple, the grating can be quickly engraved, and the consistency of the grating is ensured;
(IV) description of the drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a partial fiber type to which the present invention is applicable: (a) a single-mode optical fiber structure schematic diagram, (b) a multimode optical fiber structure schematic diagram, (c) a ring core optical fiber structure schematic diagram, and (d) a multi-core optical fiber structure schematic diagram;
FIG. 3 is a schematic diagram of the principle of irradiation of the optical fiber by the writing light beam in the V-shaped groove;
FIG. 4 is a top view of embodiment 2;
FIG. 5 is a side view of embodiment 2;
in the figure: 1-grating preparation device suitable for special-shaped core optical fiber, 101-phase mask plate, 102-quartz slice, 103-optical fiber carrier plate, 104-optical fiber matching liquid, 2-optical platform, 3-excimer laser, 4-diaphragm, 5-beam expander, 6-reflector, 7-cylindrical lens, 8-triaxial displacement table, 9-optical fiber to be inscribed, 10-optical fiber clamp, 11-optical fiber V-shaped groove connector, 12-grating inscription online monitoring system and 13-inscription light beam.
(V) detailed description of the preferred embodiments
The invention provides a technology for preparing a special-shaped core fiber grating based on reflection exposure superposition of an included angle of 120 degrees, and figure 2 lists optical fibers applicable to the invention, so that the method can be used for preparing the grating of the special-shaped core fiber and can also be used for preparing the grating of common single-mode and multimode fibers. The choice of optical fiber has no effect on the manufacturing apparatus and method of the present invention, and thus the specific fiber type is not specified in the following examples.
The invention is described in further detail below with reference to the figures and the specific embodiments.
Example 1:
this embodiment will explain the structure and operation principle of the grating preparation apparatus according to the present invention with reference to fig. 1 and 3.
As shown in fig. 1, the grating preparation apparatus 1 of the present invention includes a phase mask plate 101, a quartz wafer 102, an optical fiber carrier plate 103 and an optical fiber matching fluid 104, wherein the phase mask plate 101 covers the quartz wafer 102, and the quartz wafer 102 covers the optical fiber carrier plate 103; the phase mask 101 can be selected from various phase masks for etching FBGs, the length and width of the quartz wafer 102 are not less than those of the phase mask 101, the thickness of the quartz wafer is 50 micrometers, the quartz wafer 102 is made of quartz glass, the material has high transmittance in an ultraviolet light wave band for etching, the quartz wafer 102 is used for separating the phase mask 101 from the optical fiber carrier 103 by a certain distance, the phase mask 101 can be protected from being polluted by the optical fiber 9 to be etched and the optical fiber matching liquid 104 on the optical fiber carrier 103, the optical fiber 9 to be etched and the phase mask 101 can be guaranteed to be parallel, and the distance is within the diffraction distance of the phase mask 101. The length and width of the optical fiber carrier plate 103 are not less than those of the quartz wafer 102, the thickness is 2 mm, the used material has high transmittance in the ultraviolet band for writing, a V-shaped groove is arranged in the central area of one surface of the optical fiber carrier plate 103, the groove direction and the grating period direction of the phase mask plate 101The included angle between the two side surfaces of the groove is 120 degrees, if the optical fiber can be placed in the V-shaped groove right, namely the circular section of the cladding of the optical fiber is tangent to the three sides of the V-shaped groove, the depth of the V-shaped groove is required to be calculated through simple geometric relationship
Figure BDA0002430062840000051
Width of
Figure BDA0002430062840000052
In the formula, D represents the cladding diameter of the optical fiber, for example, for a single-mode optical fiber, the cladding diameter D is 125 ± 5 micrometers, and if D is 130 micrometers, the groove depth is not less than 140 micrometers, and the groove width is not less than 485 micrometers.
Two side surfaces of the V-shaped groove in the optical fiber carrier plate 103 are plated with metal reflecting films, and can reflect nearly 100% of the writing ultraviolet light back into the V-shaped groove. By accurately controlling the refractive index of the optical fiber matching fluid to be consistent with the refractive index of the optical fiber cladding, the inside of the V-shaped groove can be regarded as the same uniform substance, as shown in figure 3, the writing light beam and the reflected light beams on the two side surfaces of the V-shaped groove are equivalent to three light beams with 120-degree included angles and simultaneously irradiate the optical fiber, so that the uniform light beam distribution can be effectively improved, and the grating preparation quality is improved.
The optical fiber matching fluid used in the device takes water as a solvent and glycerol as a solvent, the refractive index consistent with the optical fiber cladding is obtained by accurately blending the proportion of the water to the glycerol to fill the gap between the optical fiber to be inscribed and the V-shaped groove, the absorption wave bands of the water and the glycerol are both below 230nm according to the absorption spectrum characteristics of ultraviolet wave band substances, and the ultraviolet light with the wavelength of 248nm is adopted as an inscription light source and cannot be absorbed by the optical fiber matching fluid.
Example 2
This example will explain the steps of grating fabrication using the grating fabrication apparatus of the present invention with reference to fig. 4 and 5.
Step 1, establishing a light path: in order to realize the grating preparation, the required components in addition to the grating preparation apparatus 1 of the present invention include: the device comprises an optical platform 2, an excimer laser 3, a diaphragm 4, a beam expander 5, a reflector 6, a cylindrical lens 7, a triaxial displacement table 8, an optical fiber clamp 10, an optical fiber V-shaped connector 11 and a grating inscription online monitoring system 12. An excimer laser 3 emits a high-energy ultraviolet writing light beam 13, a diaphragm 4 is used for taking light spots with uniform light intensity from the light beam 13 emitted by the excimer laser 3, a beam expander 5 is used for expanding the light spots obtained by the diaphragm 4 to meet the requirements of grating writing, a reflector 6 is used for adjusting the writing light beam from the horizontal direction to the vertical direction to meet the requirements of a grating preparation device 1, a cylindrical lens 7 compresses the writing light beam 13 in the cross section direction of an optical fiber to improve the energy density, the grating preparation device 1 is fixed on a triaxial displacement table 8, the position and the height of the grating preparation device 1 can be adjusted by adjusting the triaxial displacement table 8, optical fiber clamps 10 are distributed on two sides of the triaxial displacement table 8 and used for fixing an optical fiber 9 to be written so as to avoid the influence of the grating writing quality caused by the position change of the optical fiber in the writing process, an optical fiber V-shaped connector 11 is used for connecting the optical fiber 9 to be written into an optical grating writing online monitoring system, the grating writing online monitoring system 12 is used for monitoring the reflection spectrum and the transmission spectrum of the optical fiber 9 to be written in real time, and the optical platform 2 is used for fixing the optical components to avoid the influence of environmental vibration on grating writing;
step 2, parameter adjustment: starting an excimer laser 3, setting pulse frequency and energy, removing a phase mask plate 101 and a quartz wafer 102 on a grating preparation device 1, and adjusting the position and the height of the grating preparation device 1 through a three-axis displacement table 8 to focus an inscription beam 13 in a V-shaped groove of an optical fiber carrier plate 103;
step 3, placing an optical fiber: stripping a coating layer of an area to be engraved on an optical fiber 9 to be engraved, wherein the stripping length is greater than the length of a V-shaped groove of an optical fiber carrier plate 103, wiping the area with alcohol, putting the area into the V-shaped groove of the optical fiber carrier plate 103, dropping a proper amount of optical fiber matching fluid 104, slightly moving the optical fiber 9 to be engraved to enable the optical fiber matching fluid 104 to completely fill a gap between the V-shaped groove and the optical fiber 9 to be engraved, covering a quartz wafer 102 on the optical fiber carrier plate 103 to ensure that air between the two is removed, covering a phase mask plate 101 on the quartz wafer 102, fixing the optical fibers 9 to be engraved at two ends of a grating preparation device 1 with an optical fiber clamp 10, and connecting the optical fiber 9 to be engraved into a grating engraving online monitoring system 12 by using an optical fiber V-shaped;
step 4, writing a grating: improving the output energy of the excimer laser 3 to perform grating writing, simultaneously observing the grating writing effect by using the grating writing on-line monitoring system 12, and closing the excimer laser 3 and the grating writing on-line monitoring system 12 after the grating meets the writing requirement;
and 5, finishing preparation: and opening the optical fiber V-shaped connector 11, opening the optical fiber clamp 10, removing the phase mask plate 101 and the quartz wafer 102, and taking out the optical fiber 9 from the optical fiber carrier plate 103 to finish grating preparation.

Claims (6)

1. The utility model provides a special-shaped core fiber grating preparation facilities based on 120 degrees contained angle reflection exposure superposes which characterized by: the phase position mask comprises a phase position mask plate, a quartz slice, an optical fiber carrier plate and optical fiber matching liquid, wherein one surface of the optical fiber carrier plate is provided with a V-shaped groove used for placing an optical fiber to be etched, the quartz slice covers the optical fiber carrier plate, the phase position mask plate covers the quartz slice, and the optical fiber matching liquid is used for filling a gap between the V-shaped groove on the optical fiber carrier plate and the optical fiber to be etched.
2. The fiber carrier plate of claim 1, wherein: the used material has high transmissivity in the ultraviolet light wave band for engraving, a V-shaped groove is arranged at the central position of one surface of the carrier plate, the groove direction is consistent with the periodic direction of the phase mask grid, metal reflecting films are plated on two side surfaces of the groove, the ultraviolet light wave band for engraving has high reflectivity, the included angle of the two side surfaces of the groove is 120 degrees, the groove depth H and the groove width W are determined by the diameter D of the optical fiber cladding to be engraved, and the calculation formula is as follows:
Figure FDA0002430062830000011
3. the quartz wafer of claim 1, wherein: the length and the width of the phase mask plate are not less than those of the phase mask plate, the thickness of the phase mask plate is 50 micrometers, the quartz glass is made of the quartz glass, the high transmittance is achieved in an ultraviolet light wave band for writing, diffracted light beams generated by the phase mask plate can be transmitted to the lower optical fiber carrier plate in a lossless mode, and meanwhile the phase mask plate is protected from being polluted by optical fibers to be written and optical fiber matching liquid on the optical fiber carrier plate.
4. The phase mask as set forth in claim 1, wherein: various phase mask plates for FBG writing can be selected.
5. The matching fluid for optical fibers according to claim 1, wherein: the optical fiber has the advantages that water is used as a solvent, glycerin is used as a solute, the optical fiber has high transmittance for an ultraviolet band for writing, and the refractive index consistent with that of an optical fiber cladding is obtained by accurately controlling the proportion of the water to the glycerin.
6. A method for preparing a special-shaped core fiber grating based on reflection exposure superposition with an included angle of 120 degrees is characterized by comprising the following steps: the method comprises the following steps:
step 1: placing the grating preparation device in a grating writing platform, and adjusting writing light beams to vertically irradiate a phase mask plate of the grating preparation device from top to bottom;
step 2: removing a phase mask plate and a quartz slice of the grating preparation device, and adjusting the position and the height of the optical fiber carrier plate to focus the writing ultraviolet light beam in a V-shaped groove of the optical fiber carrier plate;
and step 3: stripping a coating layer of a region to be engraved on an optical fiber to be engraved, wherein the stripping length is greater than the length of a V-shaped groove of an optical fiber support plate, wiping the coating layer with alcohol, putting the coating layer into the V-shaped groove, dropping a proper amount of optical fiber matching liquid, slightly moving the optical fiber to be engraved to enable the optical fiber matching liquid to completely fill a gap between the V-shaped groove and the optical fiber to be engraved, covering a quartz thin plate on the optical fiber support plate to ensure that air between the V-shaped groove and the optical fiber to be engraved is removed, covering a phase mask plate on the quartz thin plate, fixing the optical fiber to be engraved by using an optical fiber clamp, and connecting the optical fiber to be engraved;
and 4, step 4: starting a laser to perform grating inscription, observing the grating inscription effect by using an online grating inscription monitoring system, and closing the laser and the online grating inscription monitoring system after the grating meets the inscription requirement;
and 5: and disconnecting the optical fiber from the grating writing online monitoring system, removing the phase mask plate and the quartz slice of the grating preparation device, and taking out the optical fiber from the V-shaped groove of the optical fiber support plate to finish grating preparation.
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CN112558216A (en) * 2020-12-20 2021-03-26 桂林电子科技大学 Reflection compensation type high-density multi-core fiber grating preparation system
CN113900176A (en) * 2021-12-10 2022-01-07 之江实验室 Immersed multi-core fiber grating inscribing device
CN114137654A (en) * 2021-11-12 2022-03-04 中国工程物理研究院激光聚变研究中心 Grating preparation method and grating preparation monitoring system for annular waveguide fiber
CN115327694A (en) * 2022-03-31 2022-11-11 西北工业大学 Clamping device for multi-core fiber Bragg grating laser direct writing
CN116520484B (en) * 2023-07-03 2023-09-22 上海频准激光科技有限公司 Fiber grating inscription method and device and fiber grating F-P cavity
CN118642222A (en) * 2024-08-16 2024-09-13 长飞(武汉)光系统股份有限公司 Roll-to-roll fiber bragg grating and array continuous inscription system

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CN208937742U (en) * 2018-11-28 2019-06-04 深圳伊讯科技有限公司 A kind of prestress control fiber grating Written Device
CN110082856A (en) * 2018-01-26 2019-08-02 福州高意光学有限公司 A kind of phase mask plate structure inscribed simultaneously for multi fiber grating

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CN1338649A (en) * 2001-09-28 2002-03-06 中国科学院上海光学精密机械研究所 Bidirectional stress tuning device of fiber grating
CN107917898A (en) * 2018-01-10 2018-04-17 吉林大学 One kind is based on mechanical compaction type long period Plastic Fiber Gratings index sensor
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Publication number Priority date Publication date Assignee Title
CN112558216A (en) * 2020-12-20 2021-03-26 桂林电子科技大学 Reflection compensation type high-density multi-core fiber grating preparation system
CN114137654A (en) * 2021-11-12 2022-03-04 中国工程物理研究院激光聚变研究中心 Grating preparation method and grating preparation monitoring system for annular waveguide fiber
CN113900176A (en) * 2021-12-10 2022-01-07 之江实验室 Immersed multi-core fiber grating inscribing device
CN113900176B (en) * 2021-12-10 2022-05-24 之江实验室 Immersed multi-core fiber grating inscribing device
CN115327694A (en) * 2022-03-31 2022-11-11 西北工业大学 Clamping device for multi-core fiber Bragg grating laser direct writing
CN115327694B (en) * 2022-03-31 2024-03-15 西北工业大学 Clamping device for multi-core fiber Bragg grating laser direct writing
CN116520484B (en) * 2023-07-03 2023-09-22 上海频准激光科技有限公司 Fiber grating inscription method and device and fiber grating F-P cavity
CN118642222A (en) * 2024-08-16 2024-09-13 长飞(武汉)光系统股份有限公司 Roll-to-roll fiber bragg grating and array continuous inscription system

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