CN110673257A - Preparation method of bamboo joint type long-period fiber grating device - Google Patents
Preparation method of bamboo joint type long-period fiber grating device Download PDFInfo
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- CN110673257A CN110673257A CN201910915120.7A CN201910915120A CN110673257A CN 110673257 A CN110673257 A CN 110673257A CN 201910915120 A CN201910915120 A CN 201910915120A CN 110673257 A CN110673257 A CN 110673257A
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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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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
- C03B37/023—Fibres composed of different sorts of glass, e.g. glass optical fibres, made by the double crucible technique
Abstract
The invention relates to a preparation method of a bamboo joint type long-period fiber grating device, which comprises the following steps: s1, removing the coating layer on the side surface of the optical fiber; s2, processing periodically distributed grooves on the side surface of the optical fiber to form an optical fiber preform; and S3, performing fusion tapering on the optical fiber preform to obtain the bamboo joint type long-period optical fiber grating device. The grating device is provided with a bamboo-shaped bulge structure which is periodically and uniformly distributed, the grating device comprises an optical fiber core and a cladding which are periodically changed at the same time, and the diameter of the cross section of the optical fiber can be hundreds of micrometers to nanometer level. The preparation method of the bamboo joint type long-period fiber grating device enables the structure of the device to be more stable and not to be easily broken.
Description
Technical Field
The invention relates to the technical field of fiber grating manufacturing, in particular to a method for manufacturing a bamboo joint type long-period fiber grating device.
Background
Long-period fiber gratings are increasingly used in optical communication and optical sensing systems. In the field of optical communication, the long-period fiber grating can be applied to gain equalizers, dispersion compensators, optical switches, wavelength division multiplexing systems, band suppression filters and mode converters; in the field of light sensing, temperature, strain and refractive index sensors may be applied. The following methods are commonly used in the manufacture of long-period fiber gratings for processing non-uniform structures along the axial direction: CO 22Laser processing, micro-cone forming technology, femtosecond laser processing, focused ion beam etching, dispensing method and the like.
By using CO2There have also been many attempts to make long period fiber gratings by laser machining. For example, Xuan, Haifeng et al, "CO2laser induced long period graduations in optical fibers, "optical Express17.24(2009):21882-2And (3) laser pulse is combined with smaller longitudinal tensile strain to periodically form a micro cone on the micro optical fiber to prepare the long-period fiber grating. Structural asymmetry across the fiber cross-section is a big problem and can lead to asymmetric mode distributions and complex mode coupling. In addition CO2The laser has large light spot, strong energy and high heat quantity, and the fiber core is influenced during processing, so the processing precision is not high.
The micro-cone forming technology also proves feasibility through experiments. For example, Yin et al, "Long Period Fiber gratings embedded by periodic Tapering a Fiber". IEEE Photonics technology Letters,26.7(2014): 698-; and the size of the device is limited by the processing technology, and the grating with the cross section size of several micrometers to nanometer level is difficult to manufacture.
In the manufacturing of Long-period fiber gratings by femtosecond laser processing, for example, Xuan, haifen, Wei Jin, and Shujing liu, "Long-period grating in wavetength-scalemics" Optics letters 35.1(2010):85-87. in the manufacturing process, multimode micro-nano fiber is directly grooved by femtosecond laser to manufacture Long-period fiber gratings, but the fiber is easy to break during and after processing, the structure is unstable, and great inconvenience is brought to application.
Therefore, there is a need in the industry to develop a method for preparing a long-period fiber grating with high precision, flexible processing and stable structure.
Disclosure of Invention
Aiming at the problems of unstable structure and low processing precision in the prior art, the invention provides a preparation method of a bamboo joint type long-period fiber grating device.
The specific scheme of the application is as follows:
a method for preparing a bamboo joint type long-period fiber grating device comprises the following steps:
s1, removing the coating layer on the side surface of the optical fiber;
s2, processing periodically distributed grooves on the side surface of the optical fiber to form an optical fiber preform;
and S3, performing fusion tapering on the optical fiber preform to obtain a bamboo joint type long-period optical fiber grating device, wherein the grating device has a bamboo joint-shaped bulge structure which is periodically and uniformly distributed.
Preferably, the processing method in step S2 is femtosecond laser processing, focused ion beam etching, or photolithography.
Preferably, if the processing method in step S2 is femtosecond laser processing, processing periodically distributed grooves on the side surface of the optical fiber by using a femtosecond laser processing system to form an optical fiber preform; the femtosecond laser processing system comprises a femtosecond laser, a diaphragm, a polaroid, an optical switch, a power meter, a high-reflection mirror, an objective lens, a CCD (charge coupled device) camera, a three-dimensional displacement platform, a first clamp and a computer; laser output by the femtosecond laser sequentially passes through a diaphragm, a polaroid, an optical switch and a power meter, then enters an objective lens for focusing through high-reflectivity mirror reflection, the optical fiber is clamped tightly by a first clamp, the first clamp is fixed on a three-dimensional displacement working platform, the three-dimensional displacement working platform is connected with a computer, the laser focused by the objective lens is aligned to the side surface of the optical fiber for processing, and a CCD (charge coupled device) camera is aligned to the side surface of the optical fiber for real-time monitoring and shooting to obtain the high-precision processing condition of the optical fiber in real time.
Preferably, the first clamp is a rotatable clamp.
Preferably, the optical fiber preform is fusion-tapered by a stepping motor-oxyhydrogen flame fusion-tapering or a fusion splicer arc discharge fusion-tapering in step S3.
Preferably, if the step S3 is performed by a step motor-oxyhydrogen flame fused tapering method, the step motor-oxyhydrogen flame fused tapering system is used to perform fused tapering on the optical fiber preform to obtain a bamboo-joint type long-period fiber grating device, and the grating device has a bamboo-joint bulge structure with periodic uniform distribution; wherein, step motor-oxyhydrogen flame awl system includes: the hydrogen generator, the flowmeter, the fire sweeping motor, the light source, the spectrometer, the computer, the controller, the stepping motor and the second clamp; the both sides of recess region are all fixed through the second anchor clamps among the optical fiber perform, and second anchor clamps and step motor are connected, and the computer passes through controller control step motor's removal, optical fiber perform's one end and light source are connected, optical fiber perform's the other end and spectrum appearance are connected, and the hydrogen of hydrogen generator output passes through the flowmeter in proper order, sweeps the fossil power machine, sweeps the shower nozzle of fossil power machine and aims at recess region among the optical fiber perform, sweeps the fossil power machine and still is connected with the controller.
Preferably, the parameters of the groove are: the depth d of the grooves, the width w of the grooves, the period f of the grooves and the number N of the grooves, wherein d is more than or equal to 5 microns and less than or equal to 30 microns, w is more than or equal to 5 microns and less than or equal to 10 microns, f is more than or equal to 5 microns and less than or equal to 20 microns, and N is more than or equal to 10 and less than or equal to 30.
Preferably, the optical fiber preform has a taper region diameter of 10 μm to 30 μm after fusion-drawing and a bulge period of 200 μm to 800 μm.
Compared with the prior art, the invention has the following beneficial effects:
according to the preparation method, the bamboo joint type long-period fiber grating device is prepared by preparing the optical fiber preform with the periodic structure in advance and then carrying out fusion tapering on the optical fiber preform. The structural uniformity of the bamboo joint type long-period fiber grating device is derived from the bulge of the bamboo joint structure, the long-period characteristic is obvious, the fiber core of the device tends to be exposed, and a larger evanescent field can be obtained; the long-period fiber grating with large diameter and the micro-nano long-period fiber grating structure with thinner diameter can be realized by processing in a fused biconical taper mode, the flexibility of direct processing is strong, the processing parameters can be changed as required, and bamboo-shaped long-period fiber grating devices with different parameters can be manufactured; compared with the method for manufacturing the long-period fiber grating by directly processing the micro-nano fiber by the femtosecond laser, the method for manufacturing the bamboo joint type long-period fiber grating device has the advantages that the structure of the device is more stable and the device is not easy to break.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing a bamboo-joint type long-period fiber grating device according to the present invention;
fig. 2 is a structural view of the femtosecond laser processing system of the present invention.
FIG. 3 is a block diagram of the stepper motor-oxyhydrogen flare-cone system of the present invention.
Fig. 4 is a schematic front view of the optical fiber preform of the present invention.
Fig. 5 is a schematic top view of the optical fiber preform of the present invention.
FIG. 6 is a schematic side view of the bamboo-joint type long-period fiber grating device of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
The invention provides a preparation method of a bamboo joint type long-period fiber grating device with a special structure. The preparation method can complete the optical fiber prefabricated rod with a periodic structure in advance, and then perform fusion tapering on the optical fiber prefabricated rod; parameters can be changed according to requirements, the optical fiber preform can be processed at high precision, and finally, bamboo-shaped long-period fiber grating devices with different parameters are obtained, and the structural design flexibility is strong; the fiber core tends to be bare, so that a larger evanescent field can be obtained; the long-period fiber grating device structure is more stable by utilizing the nonuniformity of the bamboo-shaped structure in the optical fiber.
Referring to fig. 1, a method for manufacturing a bamboo-joint type long-period fiber grating device includes:
s1, removing the coating on the side surface of the optical fiber 11; the optical fiber 11 may be a single mode optical fiber 11, a multimode optical fiber 11. And are not limited herein.
S2, processing periodically distributed grooves on the side surface of the optical fiber 11 to form an optical fiber 11 prefabricated rod; referring to fig. 4 and 5, the parameters of the grooves are: the depth d of the grooves, the width w of the grooves, the period f of the grooves and the number N of the grooves, wherein d is more than or equal to 5 microns and less than or equal to 30 microns, w is more than or equal to 5 microns and less than or equal to 10 microns, f is more than or equal to 5 microns and less than or equal to 20 microns, and N is more than or equal to 10 and less than or equal to 30. The processing on the side surface of the optical fiber 11 is not limited to the single side, both sides, and one circumference of the optical fiber 11.
The processing method in step S2 is femtosecond laser processing, focused ion beam etching, or photolithography. The microgroove (groove) structure of the optical fiber 11 preform is periodically distributed, is smooth and tidy, has no collapse, and has no residues in the processing process.
In this embodiment, if the processing method in step S2 is femtosecond laser processing, the femtosecond laser processing system is used to process periodically distributed grooves on the side surface of the optical fiber 11 to form a preform of the optical fiber 11;
referring to fig. 2, the femtosecond laser processing system includes a femtosecond laser 101, a diaphragm 102, a polarizing plate 103, an optical switch 104, a power meter 105, a high-reflection mirror 106, an objective lens 108, a CCD camera 107, a three-dimensional displacement platform 110, a first jig 111, and a computer 109; laser output by the femtosecond laser 101 sequentially passes through a diaphragm 102, a polarizing plate 103, an optical switch 104 and a power meter 105, then is reflected by a high-reflection mirror 106 and enters an objective lens 108 for focusing, a first clamp 111 clamps the optical fiber 11, the first clamp 111 is fixed on a three-dimensional displacement working platform, the three-dimensional displacement working platform is connected with a computer 109, the laser focused by the objective lens 108 aligns to the side surface of the optical fiber 11 for processing, and a CCD camera 107 aligns to the side surface of the optical fiber 11 for real-time monitoring and shooting to obtain the high-precision processing condition of the optical fiber 11 in real time. Further, the first clamp 111 is a rotatable clamp.
S3, performing fusion tapering on the optical fiber 11 preform to obtain a bamboo joint type long-period optical fiber 11 grating device, wherein the grating device has a bamboo joint-shaped bulge structure which is periodically and uniformly distributed. The diameter of the tapered region of the optical fiber 11 preform after fusion-drawing is between 10 μm and 30 μm, and the bulging period is between 20 μ 0m and 0 μm 0. The grating device of the bamboo-joint type long-period fiber 11 is shown in FIG. 6.
The method of fusion-tapering the preform of the optical fiber 11 in step S3 is a stepping motor-oxyhydrogen flame fusion-tapering or a fusion splicer arc discharge fusion-tapering.
In this embodiment, in step S3, the method for fusion tapering the optical fiber 11 preform is stepping motor-oxyhydrogen flame fusion tapering, and then a stepping motor-oxyhydrogen flame tapering system is adopted to fusion taper the optical fiber 11 preform to obtain a bamboo-joint type long-period optical fiber 11 grating device, where the grating device has a bamboo-joint bulge structure uniformly distributed periodically; wherein, referring to fig. 3, the stepping motor-oxyhydrogen flame tapering system comprises: a hydrogen generator 201, a flow meter 202, a fire-sweeping motor 203, a light source 205, a spectrometer 208, a computer 109(209), a controller 210, a stepping motor 207 and a second clamp 206; the both sides in the recess region in the prefabricated stick of optic fibre 11 all are fixed through second anchor clamps 206, and second anchor clamps 206 and step motor 207 are connected, and computer 109 passes through controller 210 control step motor 207's removal, the one end and the light source 205 of the prefabricated stick of optic fibre 11 are connected, the other end and the spectrum appearance 208 of the prefabricated stick of optic fibre 11 are connected, and the hydrogen of hydrogen generator 201 output passes through flowmeter 202 in proper order, sweeps fossil engine 203, and the shower nozzle 204 of sweeping fossil engine 203 aims at the recess region in the prefabricated stick of optic fibre 11, sweeps fossil engine 203 and still is connected with controller 210. The controller 210 controls the thermal engine 203.
The tapering platform and oxyhydrogen flame are controlled by a computer 109 program, the optical fiber 11 with the micro-groove is placed on the oxyhydrogen flame processing tapering platform, the two ends of the optical fiber 11 are connected with a broadband light source 205 and a spectrometer 208, and the spectrum processing condition is obtained in real time. By adjusting the parameters of the fusion-draw taper, as shown in fig. 6, a final device of a bamboo-type long-period fiber 11 grating with N bamboo-like structures having a bulge diameter L1, a taper diameter L2, and a bulge period L3 is obtained.
The bamboo joint type long-period fiber grating device has a unique bamboo joint structure and comprises a fiber core and a cladding which are periodically changed at the same time, and the diameter of the cross section of the fiber can be hundreds of micrometers to nanometer level. The structure is more stable, and the device has the advantages of obvious long-period characteristic, evanescent field strength, strong flexibility, easy realization and the like.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A preparation method of bamboo joint type long period fiber grating is characterized by comprising the following steps:
s1, removing the coating layer on the side surface of the optical fiber;
s2, processing periodically distributed grooves on the side surface of the optical fiber to form an optical fiber preform;
s3, performing fusion tapering on the optical fiber preform to obtain a bamboo joint type long-period optical fiber grating device; the grating device is provided with a bamboo-shaped bulge structure which is periodically and uniformly distributed.
2. The method for manufacturing a bamboo joint type long period fiber grating device according to claim 1, wherein the processing method in step S2 is femtosecond laser processing, focused ion beam etching or photolithography.
3. The method for manufacturing a bamboo-type long-period fiber grating device according to claim 2, wherein if the processing method in step S2 is femtosecond laser processing, the femtosecond laser processing system is used to process periodically distributed grooves on the side surface of the optical fiber to form an optical fiber preform;
the femtosecond laser processing system comprises a femtosecond laser, a diaphragm, a polaroid, an optical switch, a power meter, a high-reflection mirror, an objective lens, a CCD (charge coupled device) camera, a three-dimensional displacement platform, a first clamp and a computer;
laser output by the femtosecond laser sequentially passes through a diaphragm, a polaroid, an optical switch and a power meter, then enters an objective lens for focusing through high-reflectivity mirror reflection, the optical fiber is clamped tightly by a first clamp, the first clamp is fixed on a three-dimensional displacement working platform, the three-dimensional displacement working platform is connected with a computer, the laser focused by the objective lens is aligned to the side surface of the optical fiber for processing, and a CCD (charge coupled device) camera is aligned to the side surface of the optical fiber for real-time monitoring and shooting to obtain the high-precision processing condition of the optical fiber in real time.
4. The method for preparing a bamboo joint type long-period fiber grating device according to claim 3, wherein the first fixture is a rotatable fixture.
5. The method for preparing a bamboo joint type long-period fiber grating device according to claim 1, wherein the optical fiber preform is fused and tapered in step S3 by a stepping motor-oxyhydrogen flame fusion tapering or a fusion splicer arc discharge fusion tapering.
6. The method for preparing a bamboo joint type long period fiber grating device according to claim 5, wherein if the method for fusion tapering the optical fiber preform in step S3 is stepping motor-oxyhydrogen flame fusion tapering, the optical fiber preform is fusion tapered by using a stepping motor-oxyhydrogen flame tapering system to obtain the bamboo joint type long period fiber grating device, and the grating device has a bamboo joint-shaped bulge structure with periodic uniform distribution;
wherein, step motor-oxyhydrogen flame awl system includes: the hydrogen generator, the flowmeter, the fire sweeping motor, the light source, the spectrometer, the computer, the controller, the stepping motor and the second clamp;
the both sides of recess region are all fixed through the second anchor clamps among the optical fiber perform, and second anchor clamps and step motor are connected, and the computer passes through controller control step motor's removal, optical fiber perform's one end and light source are connected, optical fiber perform's the other end and spectrum appearance are connected, and the hydrogen of hydrogen generator output passes through the flowmeter in proper order, sweeps the fossil power machine, sweeps the shower nozzle of fossil power machine and aims at recess region among the optical fiber perform, sweeps the fossil power machine and still is connected with the controller.
7. The method for preparing the bamboo joint type long-period fiber grating device according to claim 1, wherein the parameters of the groove are as follows: the depth d of the grooves, the width w of the grooves, the period f of the grooves and the number N of the grooves, wherein d is more than or equal to 5 microns and less than or equal to 30 microns, w is more than or equal to 5 microns and less than or equal to 10 microns, f is more than or equal to 5 microns and less than or equal to 20 microns, and N is more than or equal to 10 and less than or equal to 30.
8. The method for preparing a bamboo joint type long period fiber grating device according to claim 1, wherein the diameter of the tapered zone of the fiber preform after fusion tapering is between 10 μm and 30 μm, and the bulge period is between 200 μm and 800 μm.
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Cited By (4)
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| CN111856645A (en) * | 2020-07-28 | 2020-10-30 | 中国人民解放军国防科技大学 | Fused-cone type long-period fiber grating, preparation device, preparation method and laser system |
| CN113427135A (en) * | 2021-06-25 | 2021-09-24 | 西安交通大学 | Device and method for processing optical fiber microstructure by femtosecond laser rotation |
| CN113860727A (en) * | 2021-08-27 | 2021-12-31 | 哈尔滨工程大学 | Preparation method of self-deformation core optical fiber based on oxyhydrogen flame heating |
| CN115236798A (en) * | 2022-09-20 | 2022-10-25 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber grating and preparation device and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111856645A (en) * | 2020-07-28 | 2020-10-30 | 中国人民解放军国防科技大学 | Fused-cone type long-period fiber grating, preparation device, preparation method and laser system |
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| CN113427135A (en) * | 2021-06-25 | 2021-09-24 | 西安交通大学 | Device and method for processing optical fiber microstructure by femtosecond laser rotation |
| CN113860727A (en) * | 2021-08-27 | 2021-12-31 | 哈尔滨工程大学 | Preparation method of self-deformation core optical fiber based on oxyhydrogen flame heating |
| CN113860727B (en) * | 2021-08-27 | 2023-05-05 | 哈尔滨工程大学 | Preparation method of self-deformation core optical fiber based on oxyhydrogen flame heating |
| CN115236798A (en) * | 2022-09-20 | 2022-10-25 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber grating and preparation device and preparation method thereof |
| CN115236798B (en) * | 2022-09-20 | 2022-11-22 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber grating and preparation device and preparation method thereof |
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Application publication date: 20200110 |