CN113860727B - Preparation method of self-deformation core optical fiber based on oxyhydrogen flame heating - Google Patents
Preparation method of self-deformation core optical fiber based on oxyhydrogen flame heating Download PDFInfo
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- CN113860727B CN113860727B CN202110997851.8A CN202110997851A CN113860727B CN 113860727 B CN113860727 B CN 113860727B CN 202110997851 A CN202110997851 A CN 202110997851A CN 113860727 B CN113860727 B CN 113860727B
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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
- C03B37/10—Non-chemical treatment
- C03B37/14—Re-forming fibres or filaments, i.e. changing their shape
- C03B37/15—Re-forming fibres or filaments, i.e. changing their shape with heat application, e.g. for making optical fibres
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- 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
- C03B37/10—Non-chemical treatment
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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
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Abstract
The invention provides a preparation method of self-deformation core optical fiber based on oxyhydrogen flame heating, which comprises the following steps: firstly, preprocessing Multimode Fiber (MMF for short); setting functional parameters of the CO2 carving laser etching program through computer software, and repeating the etching program until the etching area reaches a proper depth and the surface of the etching area is smooth; after the etching of one surface of the optical fiber cladding is finished, a twistable clamp is adjusted to enable the whole optical fiber to rotate 90 degrees, 180 degrees and 270 degrees respectively, the prefabricated rectangular cladding MMF is placed on an oxyhydrogen flame heating device, a heating program is operated, the MMF is etched into a rectangular column cladding to be melted and deformed under the heating of oxyhydrogen flame, and substances in an etching area are distributed in a reflow mode under the action of tension, so that the rectangular cladding is restored to be circular, and the self-deformed special-shaped core optical fiber is prepared.
Description
Technical Field
The invention belongs to the field of optical fiber preparation, and relates to a preparation method of a special-shaped core optical fiber based on oxyhydrogen flame heating.
Background
In astronomical physics research, improving the accuracy of view velocity measurement and instrument stability have important meaning. The key point of realizing the measurement accuracy of the view direction speed in the order of centimeters per second is to enhance the stability of the spectral line in the detection system of the spectrometer, and the main factors influencing the accuracy of the spectral line at present are the illumination stability of the spectrometer, the stability of starlight signals and the stability of calibration signals. The view direction speed measurement system mainly transmits the spectrum information acquired by the telescope to the spectrometer through the optical fiber, compared with lens transmission, the circular optical fiber not only simplifies the structure of the whole detection system, but also enhances the stability of light beam propagation due to the mode disturbance characteristic of the multimode optical fiber. Nevertheless, although the round optical fiber has better mode disturbing characteristics in the angular direction, the mode disturbing effect in the radial direction is poor, the star light signal transmitted by the optical fiber is influenced by the atmospheric vision, the guiding error and the defocusing modulation in the incident process, and the optical fiber emergent field shows the change of the near-field centroid and the non-uniformity of far-field light intensity distribution. The centroid or light intensity change caused by modulation after the optical fiber is emergent is transmitted through a spectrometer system, spectral line drift is caused after spectral line acquisition, and the offset error and a starlight detection Doppler frequency shift signal are mutually influenced, so that the improvement of the accuracy of measuring the viewing direction speed is limited.
Therefore, it is an important issue to be solved in the present day by increasing the mode disturbing gain of the optical fiber transmission system to enhance the stability of the exit field. To achieve this requirement, current methods include lens scrambling, mechanical vibration and integrating sphere. However, the methods have the defects of large energy loss, unstable structure and the like, and cannot meet the requirement of long detection period of high-precision view-direction speed measurement technology. The mode disturbance characteristic is improved by changing the cross-sectional shape of the optical fiber, and the mode disturbance method is one of the most promising mode disturbance methods which are applicable to high-precision long-period view-direction speed measurement at present.
When the existing octagonal optical fiber or rectangular optical fiber is subjected to mode disturbing, the existing octagonal optical fiber or rectangular optical fiber needs to be connected with a round optical fiber to perform light incidence and emergent, and the existing technology cannot achieve complete adaptation of two optical fibers with different fiber core shapes, so that transmission efficiency is reduced to a certain extent, which is very unfavorable for performing subsequent measurement. The self-deformation special-shaped core optical fiber adopts the transition of the adiabatic taper, so that the round fiber core is smoothly transited to the rectangular core or the octagonal core optical fiber, and the tapered transition area of the tapered micro-optical fiber is relatively gentle. The slow change in the over-taper region results in a smaller local taper angle and a smaller relative local change in taper radius. The diameter of the slowly-changing cone changes slowly, and the optical fiber has stronger binding force to light. The energy of light transmission is mainly carried by the fundamental mode of the fiber core, and the light leaked from the fiber also occupies a very small proportion, so that the energy lost in the interaction of the external environment is greatly reduced, the micro-loss light transmission can be basically realized, and the transmission efficiency is improved.
Disclosure of Invention
The invention aims to provide a preparation method of a novel quadrilateral mode disturbing optical fiber, which solves the defects of the prior art in practical application, reduces the energy loss of light transmission in the optical fiber and effectively improves the light transmission efficiency.
The technical scheme of the invention is as follows:
firstly, preprocessing an optical Fiber, taking a section of Multimode Fiber (MMF), removing a coating layer from the middle of the MMF by about 10cm to expose a bare optical Fiber, placing the bare optical Fiber at the center of a focal plane of a carbon dioxide laser, fixing the left and right ends of the MMF on a three-dimensional displacement clamp, and applying a tiny tension to the axial direction of the optical Fiber by adjusting an x-axis displacement table to keep the optical Fiber in a horizontal straightening state. .
Then, setting functional parameters of a CO2 carving laser etching program through computer software, such as: the etched line distance d and the number of etched lines N, a program is run to allow the laser to operate for a period of time until stable. And placing the bare optical fiber fixed between the three-dimensional displacement tables under an etching laser, setting the scanning speed and the scanning frequency of the CO2 laser, running an etching program once, observing the etched area of the optical fiber in a side observation system, and repeatedly running the etching program until the etching area reaches a proper depth and the surface of the etching area is smooth.
After the etching of one surface of the optical fiber cladding is finished, the twistable clamp is adjusted to enable the whole optical fiber to rotate 90 degrees, 180 degrees and 270 degrees respectively, the etching procedure is repeatedly operated to enable the etching area to reach the same depth as the first etching surface, and finally the etched area of the cladding of the optical fiber is changed into a cuboid from a cylinder.
And placing the prefabricated rectangular cladding MMF on an oxyhydrogen flame heating device, wherein two ends of the oxyhydrogen flame heating device are respectively fixed on a three-dimensional displacement clamp, and the three-dimensional displacement clamp is controlled by an electric stepping motor. The position of the optical fiber substrate is adjusted so that the etching area is just positioned at the hydrogen outlet. Setting a stepping distance L of an electric stepping motor, opening a hydrogen gas outlet device, igniting hydrogen by using an igniter, running a heating program, melting and deforming the MMF etched into a rectangular column cladding under the heating of oxyhydrogen flame, and re-flowing and distributing substances in an etched area under the action of tension, so that the rectangular cladding is restored to be circular again, and the self-deforming special-shaped core optical fiber is prepared.
And carrying out end face observation on the prepared self-deformation special-shaped core optical fiber. In the observation, the coating layer before the optical fiber deformation portion is firstly stripped off and inserted into the bare optical fiber adapter, the optical fiber is cut from the middle of the optical fiber core deformation portion by using the optical fiber cutting knife, and the optical fiber is placed in the end face observation device to observe the optical fiber core deformation condition.
Compared with the prior art, the invention has the following beneficial effects:
1. in a common MMF, a rectangular core structure is directly introduced, and the cross-sectional shape of the integral fiber core changes smoothly from round to square and then from round to square. Optical fibers with different fiber core shapes do not need to be spliced to enhance the mode disturbing effect, so that the loss of optical energy caused by fiber core adaptation is avoided.
2. The mode disturbing effect of the special-shaped core optical fiber prepared by the method is obviously enhanced compared with that of the original MMF.
Drawings
FIG. 1 is a schematic structural view of a self-deforming shaped core;
fig. 2 is an end view schematic of a self-deforming shaped core.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and examples:
the preparation method of the self-deformation core mode disturbing optical fiber based on oxyhydrogen flame heating is characterized in that the self-deformation special-shaped core optical fiber with a rectangular fiber core is prepared by utilizing a high-frequency carbon dioxide laser and an oxyhydrogen flame heating device, and the preparation method is characterized in that a heat insulation cone is adopted for transition, so that a round fiber core is smoothly transited to the rectangular core, micro-loss light transmission can be basically realized, and the transmission efficiency is improved.
Firstly, a section of Multimode Fiber (MMF) is taken, the Fiber core diameter of the Multimode transmission Fiber is 62.5 mu m, the cladding diameter is 125 mu m, the Fiber core aperture NA=0.22, a coating layer with the length of about 50mm in the middle of the MMF is stripped to expose the bare Fiber, the bare Fiber is fixed at the center of a focal plane of a carbon dioxide laser etching device by using a twistable fixture, the etching function of the carbon dioxide laser is controlled by a computer, the etching depth is determined by preset power and scanning times, a CCD (charge coupled device) can be used for monitoring the smooth condition of an etching process and an etching area in real time, and before the etching process, the X-axis direction of the twistable fixture is slightly adjusted to apply a tiny axial tension to the Fiber so that the Fiber is kept in a straight state.
The system parameters required for manufacturing the rectangular cladding were set in a computer program for controlling the carbon dioxide laser, the etched line distance d was set to 50 μm, the number of etched lines N was set to 201, and by setting the system parameters, a rectangular cladding optical fiber having an etched region length of 10mm was prepared. The side length of the rectangular cladding can be controlled by changing preset power and scanning times, an etching program is opened, the etching program is stable after running for a period of time, the optical fiber is etched, and in the etching process, the etching depth and the flatness of an etching surface of the optical fiber are observed by using a CCD.
After the etching of one surface of the cladding is completed, the twistable clamp is adjusted to enable the whole optical fiber to rotate 90 degrees, 180 degrees and 270 degrees respectively, and the etching procedure is repeatedly operated to enable the etching area to reach the same depth as the first etching surface. Rectangular clad optical fibers having side lengths of 100 μm, 90 μm, and 80 μm were prepared, respectively.
In the preparation process, the structure is fixed at the hydrogen outlet, and the computer program can set the hydrogen outlet quantity and the structure stepping distance in the heating process. The two ends of the rectangular cladding MMF are respectively fixed on a three-dimensional displacement clamp, and the three-dimensional displacement clamp is controlled by an electric stepping motor. The stepping distance L is set to be 1mm, so that the round fiber core is stably transited to the rectangular core or the octagonal core optical fiber, the adiabatic taper with smaller energy loss is prepared, in the oxyhydrogen flame heating process, the rectangular cladding region can be restored to be round due to tension on the surface of the optical fiber in a molten state, and the inner round fiber core is influenced by deformation of the outer cladding and can correspondingly deform, so that the optical fiber with the rectangular fiber core is obtained. And (3) carrying out oxyhydrogen flame heating on the rectangular cladding with different side lengths, and observing the influence of the side lengths of the cladding on the deformation of the fiber core.
And detecting the end face of the prepared rectangular core optical fiber, and observing the deformation condition of the optical fiber core. In the observation, we stripped the coating about 50mm along the deformation zone, exposing the bare fiber, which was then cut at the bare fiber port and inserted into the fiber adapter. After the structure completely passes through the optical fiber adapter, the structure is placed on an optical fiber cutting knife, a deformation area of the structure is found and cut from the middle, and the structure is placed in an end surface observation device, wherein the end surface observation device comprises a microscopic observation device, an optical fiber fixing device and a display screen. After cutting the optical fiber structure, the optical fiber adapter is inserted into the optical fiber fixing device, the position of the microscopic observation device is adjusted, and an image formed by the end face in the display screen is observed to obtain the deformation condition of the rectangular core.
Claims (2)
1. The preparation method of the self-deformation core optical fiber based on oxyhydrogen flame heating is characterized by comprising the following steps:
firstly, preprocessing multimode eFiber, MMF for short, of multimode fiber; then, setting functional parameters of a CO2 carving laser etching program through computer software: the etching line distance d and the etching line number N, running a program, enabling the laser to work for a period of time until the laser is stable, placing the bare optical fiber fixed between the three-dimensional displacement tables under the etching laser, setting the scanning speed and the scanning frequency of the CO2 laser, running the etching program once, observing the etched area of the optical fiber in a side observation system, and repeatedly running the etching program until the etching area reaches a proper depth and the surface of the etching area is smooth;
after the etching of one surface of the optical fiber cladding is finished, the twistable clamp is adjusted to enable the whole optical fiber to rotate 90 degrees, 180 degrees and 270 degrees respectively, the etching procedure is repeatedly operated to enable the etching area to reach the same depth as the first etching surface, and finally the etched area of the cladding of the optical fiber is changed into a cuboid from a cylinder;
the method comprises the steps of placing a prefabricated rectangular cladding MMF on an oxyhydrogen flame heating device, fixing two ends of the prefabricated rectangular cladding MMF on a three-dimensional displacement clamp respectively, controlling the three-dimensional displacement clamp by an electric stepping motor, adjusting the position of an optical fiber substrate, enabling an etching area to be located at a hydrogen outlet, setting the stepping distance L of the electric stepping motor, opening a hydrogen gas outlet device, igniting hydrogen by using an igniter, running a heating program, enabling the MMF to be etched into a rectangular column cladding to be melted and deformed under the heating of oxyhydrogen flame, and enabling substances in the etching area to reflow and be distributed under the action of tension, so that the rectangular cladding is restored to be round, and the self-deformed special-shaped core optical fiber is prepared.
2. The method for manufacturing a self-deformation core optical fiber based on oxyhydrogen flame heating according to claim 1, wherein a 10cm portion in the middle of the MMF is stripped to expose the bare optical fiber, the bare optical fiber is placed at the center of the focal plane of the carbon dioxide laser, both left and right ends of the MMF are fixed on a three-dimensional displacement jig, and a slight tension is applied to the axial direction of the optical fiber by adjusting the x-axis displacement table to maintain a horizontally straightened state.
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| CN111751925A (en) * | 2019-03-27 | 2020-10-09 | 华为技术有限公司 | Optical fiber, preparation method thereof, optical fiber amplifier and optical fiber laser |
| CN112882150A (en) * | 2021-03-23 | 2021-06-01 | 江苏朗普达光电科技有限公司 | Oxyhydrogen flame-based mode matching optical fiber manufacturing device |
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- 2021-08-27 CN CN202110997851.8A patent/CN113860727B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700045A (en) * | 2004-05-20 | 2005-11-23 | 北京大学 | Method for making hot core expansion optical fiber |
| CN1985201A (en) * | 2004-07-15 | 2007-06-20 | 旭硝子株式会社 | Glass optical waveguide |
| CN109768459A (en) * | 2019-02-14 | 2019-05-17 | 深圳市鹏星光电科技有限公司 | A kind of pump light stripper of laser ablation and preparation method thereof |
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| CN110673257A (en) * | 2019-09-26 | 2020-01-10 | 暨南大学 | Preparation method of bamboo joint type long-period fiber grating device |
| CN111087182A (en) * | 2020-01-10 | 2020-05-01 | 宁波大学 | Chemical corrosion preparation method of chalcogenide glass tapered optical fiber |
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