CN111722314A - Method for manufacturing mechanical long-period fiber grating - Google Patents
Method for manufacturing mechanical long-period fiber grating Download PDFInfo
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- CN111722314A CN111722314A CN202010460544.1A CN202010460544A CN111722314A CN 111722314 A CN111722314 A CN 111722314A CN 202010460544 A CN202010460544 A CN 202010460544A CN 111722314 A CN111722314 A CN 111722314A
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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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Abstract
A method for manufacturing a mechanical long-period fiber grating comprises a hoop device, a winding drum groove with a period groove and an optical fiber, wherein the period groove is formed in the inner side of the winding drum groove; the hoop device is of a single-side screw fixing structure; wherein the optical fiber can be directly placed in the groove of the winding drum; when the screws are fixed, the grooves of the hoop device are contracted, the winding drum is further tightened, and the periodic grooves in the inner side of the winding drum press the optical fibers, so that the long-period fiber grating is generated. The invention has the advantages of simplified process, mature process flow, low cost, simple structure, stable performance, tunable resonant wavelength, controllable mode coupling strength and erasable grating.
Description
Technical Field
The invention relates to the field of optical fiber sensing and the field of manufacturing processes of optical communication passive devices, in particular to a manufacturing method of a mechanically chirped long-period fiber grating (MCLPFG).
Background
Along with the rapid development of economic society, the optical fiber technology is dramatically improved in recent decades, and more optical fiber functional devices are deeply researched. The fiber grating is a device with the periodic variation of the refractive index of the fiber core, is a frequency spectrum selection element, has small volume and simple manufacture, is easy to be connected with other fiber devices, and can form various all-fiber devices. Long-period fiber gratings (LPFGs) are playing an increasingly important role in the field of optical communications because of their advantages of simple fabrication, easy connection, low insertion loss, no back reflection, etc. In addition, the LPFG is sensitive to changes in environmental parameters (refractive index, temperature, humidity, stress, bending, twisting, etc.), and thus has a great competitive advantage in sensing measurements.
At present, the manufacture of the long-period grating is mostly realized by irradiating a fiber core in a germanium-doped hydrogen-loaded optical fiber through ultraviolet laser and a mask plate so as to introduce large periodic variation of refractive index; the performance of the long-period fiber grating, including stress, temperature, bending, etc., is susceptible to the external environment. Another common process for fabricating long-period fiber gratings is to use CO2The method of laser point-by-point writing enables the refractive index of the fiber core of the optical fiber to generate periodic change; the method can obtain larger effective refractive index change, has stable device performance, but has complex process and high cost, and is not suitable for large-scale production. Mechanical long-period fiber gratings (MLPFG) can be easily formed compared to ultraviolet induced long-period fiber gratings (UV-LPFG), and the peak loss at the resonant wavelength can be adjusted by changing the external pressure. A typical MLPFG fabrication method is to apply pressure to the fiber through periodic grooves and flats, or two periodic grooves. Other methods are also: nylon wire winding, compression with springs, periodically arranged graphite rods or wires, and the like. However, almost all MLPFGs cannot be used independently without complicated, bulky, and bulky force applying devices, which greatly limits the range and application of MLPFGs.
Therefore, the currently proposed method for manufacturing the LPFG has complex process, high cost, single grating function and heavy and complicated mechanical device, which causes great problems in the manufacturing of the MLPFG.
Disclosure of Invention
In order to solve the problem of difficult manufacture of the mechanical long-period grating (MLPFG), the invention provides the method for manufacturing the mechanical long-period fiber grating, which has the advantages of simplified process, mature process flow, low cost, simple structure, stable performance, tunable resonant wavelength, controllable mode coupling strength, erasable grating and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for manufacturing mechanical long-period fiber grating comprises a hoop device (also called a hoop, commonly called a quick flange device), a winding drum groove with a period groove and an optical fiber, wherein the period groove is manufactured on the inner side of the winding drum groove; the hoop device is of a single-side screw fixing structure; wherein the optical fiber can be directly placed in the groove of the winding drum; when the screws are fixed, the grooves of the hoop device are contracted, the winding drum is further tightened, and the periodic grooves in the inner side of the winding drum press the optical fibers, so that the long-period fiber grating is generated.
Further, the radius of the groove of the hoop device is matched with the outer diameter of the winding drum, and the inner diameter of the winding drum is matched with the diameter of the optical fiber; including but not limited to single mode optical fibers.
Further, the hoop device carries out structural processing through processes of material knocking (cutting size), stamping, welding, punching, hot-dip plating and the like; processing an internal thread hole in a fixing plate through a numerical control processing center; the upper and lower sheets of the opening of the hoop device are staggered, so that one side of the hoop device can be coated with the other side of the hoop device when the hoop device is contracted.
Furthermore, the winding drum groove is processed into a periodic groove through a numerical control processing center, and then is rounded, and the length of the periodic groove does not exceed the perimeter of the cross section of the optical fiber.
The manufacturing method comprises the following steps:
step one, a metal sample with set thickness is placed in a precise numerical control machining center, external structural shape machining is carried out, particularly periodic grooves are machined, the direction of the periodic grooves is perpendicular to the placement direction of optical fibers, the length of the periodic grooves is smaller than the perimeter of the cross section of the optical fibers, then rounding is carried out by using rounding equipment to form a winding drum, and gaps with set width are reserved;
performing structural processing on another metal material by using a numerical control processing center, rounding equipment, stamping equipment and welding equipment, and performing processing through processes of material knocking (cutting design size), stamping (preparing fixed radian shape), welding, punching and hot-dip (corrosion prevention); in the stamping process, the upper and lower sheets at the opening of the hoop need to be staggered so that the hoop device can be continuously contracted at the later stage, notches are formed in the front and rear edges of the sheet at the inner side so that the sheet at the other side can be fixed by one side during contraction and can not slide back and forth, and a numerical control machining center is used for machining an internal thread hole in one fixing plate to manufacture a complete hoop device structure;
and thirdly, placing the optical fiber with the coating layer into the groove of the winding drum, placing a screw with the same size as the hole into the hole of the hoop device (firstly, screwing the screw into the internal threaded hole), and tightening the screw by the hoop device to contract the hoop device so as to contract the groove of the winding drum and generate periodic pressure on the optical fiber by the periodic groove, thereby forming the long-period fiber bragg grating (MLPFG).
Preferably, the metal sample includes, but is not limited to, stainless acid-proof steel and the like.
The technical conception of the invention is as follows: through the mechanical processing staple bolt device structure, place an independent reel in its recess inboard, the inboard preparation of reel has periodic groove, through fastening screw for the shrink of staple bolt device and then the reel shrink, its inboard periodic groove suppression optic fibre, thereby realize a stable and reliable performance, can break away from complicated atress device exclusive use's mechanical system long period fiber grating that chirps.
The invention has the following beneficial effects: 1) the manufacturing process has the advantages of simple route, mature process flow and lower cost; 2) the process technology enables the long-period fiber grating to have a stable filtering effect and stable performance, and the damage rate of the fiber grating is reduced due to the characteristics (corrosion resistance and high strength of metal) of the material of the hoop device; 3) through the different interval cycle recesses of processing reel inboard, the fastening degree of side screw can realize different applied pressure and filtering wavelength to produce different filtering effect.
Drawings
FIG. 1 is a flow chart for making a periodic grooved roll.
FIG. 2 is a flow chart of a method for fabricating a mechanically fabricated long-period fiber grating structure.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a method for manufacturing a mechanically manufactured long-period fiber grating includes a hoop device 104 (also called a hoop, commonly called a quick flange device), a drum groove 103 with a period groove, and an optical fiber 106, wherein the period groove is formed inside the drum groove 103; the hoop device 104 is a unilateral screw fixing structure; wherein the optical fiber 106 is directly placed in the groove 103 of the winding drum, when the screw is fixed, the groove of the hoop device 104 is contracted, the winding drum 103 is further contracted, the periodic groove inside the winding drum 103 presses the optical fiber, and thus, a Long Period Fiber Grating (LPFG) is generated.
Further, the groove radius of the hoop device 104 is matched with (basically consistent with) the outer diameter of the winding drum, and the inner diameter of the winding drum 103 is matched with (basically consistent with) the diameter of the optical fiber; including but not limited to single mode optical fibers.
Further, the hoop device 104 performs structural processing through processes of material knocking (shearing size), stamping, welding, punching, hot-dip plating and the like; processing an internal thread hole in a fixing plate through a numerical control processing center; the open portion of the hoop means 104 is offset from the top and bottom sheets so that one side of the hoop means can wrap the other side of the hoop means when the hoop means is retracted.
Furthermore, the winding drum groove 103 is formed by first processing a periodic groove through a numerical control processing center and then rounding, and the length of the periodic groove does not exceed the perimeter of the cross section of the optical fiber. The metal sample 101 includes, but is not limited to, stainless acid-proof steel and the like.
The manufacturing method comprises the following steps:
step one, a metal sample 101 with set thickness is placed in a precise numerical control machining center, external structural shape machining is carried out, particularly periodic groove machining is carried out, the direction of the periodic groove is perpendicular to the placement direction of optical fibers, the length of the periodic groove is smaller than the perimeter of the cross section of the optical fibers, then rounding is carried out by using rounding equipment to form a winding drum, and a gap with set width is reserved;
secondly, performing structural processing on another metal material 101 by using a numerical control processing center, rounding equipment, stamping equipment and welding equipment, and performing processing through processes of material knocking (cutting design size), stamping (preparing fixed radian shape), welding, punching, hot dipping (corrosion prevention) and the like; in the stamping process, the upper and lower sheets at the opening of the hoop need to be staggered so that the hoop device can be continuously contracted at the later stage, notches are formed in the front and rear edges of the sheet at the inner side so that the sheet at the other side can be fixed by one side during contraction and can not slide back and forth, and a numerical control machining center is used for machining an internal thread hole in one fixing plate to manufacture a complete hoop device 104 structure;
and thirdly, placing the optical fiber 106 with the coating layer into the winding drum groove 103, placing a screw with the same size as the hole into a hole of the hoop device 104 (turning into the internal threaded hole through the unthreaded hole), contracting the hoop device 104 by screwing the screw, further contracting the winding drum groove 103, and pressing the optical fiber by the inner side periodic groove to form the long-period fiber bragg grating (MLPFG).
Claims (6)
1. The manufacturing method of the mechanical long-period fiber grating is characterized in that the mechanical long-period fiber grating comprises a hoop device, a winding drum groove with a period groove and an optical fiber, wherein the period groove is formed in the inner side of the winding drum groove; the hoop device is of a single-side screw fixing structure; wherein the optical fiber can be directly placed in the groove of the winding drum; when the screws are fixed, the grooves of the hoop device are contracted, the winding drum is further tightened, and the periodic grooves in the inner side of the winding drum press the optical fibers, so that the long-period fiber grating is generated.
2. The method of claim 1, wherein the groove radius of the hoop device is matched to the outer diameter of the winding drum, and the inner diameter of the winding drum is matched to the diameter of the optical fiber; the optical fiber is a single mode optical fiber.
3. The method for manufacturing a mechanical long-period fiber grating as claimed in claim 1 or 2, wherein the hoop device is subjected to structural processing by processes of material punching, stamping, welding, punching and hot-dip plating; processing an internal thread hole in a fixing plate through a numerical control processing center; the upper and lower sheets of the opening of the hoop device are staggered, so that one side of the hoop device can be coated with the other side of the hoop device when the hoop device is contracted.
4. The method of claim 1 or 2, wherein the winding drum groove is first machined with a periodic groove by a numerical control machining center and then rounded, and the length of the periodic groove does not exceed the circumference of the cross section of the optical fiber.
5. A method of fabricating a mechanically long period fiber grating as claimed in claim 1 or 2, wherein said method comprises the steps of:
step one, a metal sample with set thickness is placed in a precise numerical control machining center, external structural shape machining is carried out, particularly periodic grooves are machined, the direction of the periodic grooves is perpendicular to the placement direction of optical fibers, the length of the periodic grooves is smaller than the perimeter of the cross section of the optical fibers, then rounding is carried out by using rounding equipment to form a winding drum, and gaps with set width are reserved;
performing structural processing on another metal material by using a numerical control processing center, rounding equipment, stamping equipment and welding equipment, and performing processing through processes of material knocking, stamping, welding, punching and hot-dip plating; in the stamping process, the upper and lower sheets at the opening of the hoop need to be staggered so that the hoop device can be continuously contracted at the later stage, notches are formed in the front and rear edges of the sheet at the inner side so that the sheet at the other side can be fixed by one side during contraction and can not slide back and forth, and a numerical control machining center is used for machining an internal thread hole in one fixing plate to manufacture a complete hoop device structure;
and thirdly, placing the optical fiber with the coating layer into the groove of the winding drum, placing a screw with the same size as the hole into the hole of the hoop device, tightening the screw by the hoop device to shrink the groove of the winding drum, and then the periodic groove generates periodic pressure on the optical fiber, thereby forming the long-period fiber grating.
6. The method of claim 5, wherein the metal sample is made of stainless steel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089467A (en) * | 2021-11-29 | 2022-02-25 | 广东工业大学 | Preparation device and preparation method of long-period grating with adjustable period |
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| CN103760688A (en) * | 2013-12-31 | 2014-04-30 | 中国计量学院 | Tunable optical-fiber filter |
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| CN108845388A (en) * | 2018-06-20 | 2018-11-20 | 浙江工业大学 | A kind of production method of machinery long-period fiber grating |
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2020
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| US5787213A (en) * | 1996-07-03 | 1998-07-28 | Lucent Technologies | Method and apparatus for writing Bragg gratings on strained optical fibers |
| JP2003172887A (en) * | 2001-12-06 | 2003-06-20 | Fujikura Ltd | Variable optical attenuator and light amplifier using the same |
| JP2005017462A (en) * | 2003-06-24 | 2005-01-20 | Fujikura Ltd | Variable property optical fiber grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089467A (en) * | 2021-11-29 | 2022-02-25 | 广东工业大学 | Preparation device and preparation method of long-period grating with adjustable period |
| CN114089467B (en) * | 2021-11-29 | 2024-04-16 | 广东工业大学 | Preparation device and preparation method of period-adjustable long-period grating |
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| CN111722314B (en) | 2023-04-07 |
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