CN110716264A - Soft glass optical fiber welding method - Google Patents
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- CN110716264A CN110716264A CN201910863819.3A CN201910863819A CN110716264A CN 110716264 A CN110716264 A CN 110716264A CN 201910863819 A CN201910863819 A CN 201910863819A CN 110716264 A CN110716264 A CN 110716264A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2555—Alignment or adjustment devices for aligning prior to splicing
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Abstract
The invention discloses a soft glass optical fiber fusion splicing method, which is characterized in that a preheating link is added in a fusion splicing heating process, a one-way propulsion mode is adopted, the preheating treatment and the heating fusion splicing are carried out according to two stages, the end surface of a soft glass optical fiber is close to the softening degree in the preheating process, and the optical fiber to be fused with higher softening temperature is unidirectionally propelled, so that the fusion splicing of the optical fiber is completed, the excessively high fusion splicing temperature is not needed, meanwhile, the excessive softening of the soft glass optical fiber can be avoided, and the fusion splicing efficiency is effectively improved.
Description
Technical Field
The invention belongs to the technical field of mid-infrared fiber lasers, and particularly relates to a soft glass fiber welding method.
Background
In recent years, a mid-infrared super-continuous laser light source (SC-MIR) with unique application advantages in the fields of infrared directional interference technology, super-long-distance communication and the like becomes a research hotspot of the direction of fiber laser. Limited by intrinsic absorption loss, conventional silica fibers experience a sharp increase in loss at transmission above the 2.5 μm band, and are not suitable for SC-MIR generation. With fluoride (ZrF)4-BaF2-LaF3-AlF3NaF (ZBLAN) and InF3) Sulfur, sulfurCompound (As)2S3And As2Se3) And tellurate (TeO)2And TeO2-BaF2-Y2O3) The special Soft Glass Fiber (SGF) represented by the above is one of the most ideal mid-infrared transmission media, having a wide infrared transmission window and a large nonlinear refractive index, and is used in the research of mid-infrared fiber lasers in succession. However, at present, the SC-MIR fiber laser is difficult to realize efficient full fiber integration, and most of the special soft glass fibers are connected with the pumping light source in a spatial coupling manner (such as fiber end surface mechanical butt joint, lens coupling, and the like), so that the improvement of the SC-MIR power level is limited, and the subsequent further cascade connection of the special soft glass fibers is not facilitated to expand the spectrum range.
In the field of high-power fiber lasers, mechanical fusion is the most common technical means for achieving full-fiber in addition to spatial coupling. At present, for welding with a soft glass optical fiber, welding can be realized by using an asymmetric electrode discharge welding technology, but the technology has the following defects:
1. when high softening temperature fiber end face can be softened low softening temperature fiber end face, the temperature of high softening temperature fiber end face is higher, directly propels two kinds of optic fibre each other, and the softening region of low softening temperature fiber end face can increase rapidly to lead to low softening temperature fiber softening region to be good at the required distance of butt fusion, pile up the distance behind two kinds of fiber fusion and too big, and then influence fusion efficiency.
2. When a mechanical force is used to push a softened low-softening-temperature optical fiber toward an unsoftened high-softening-temperature optical fiber, the fiber core of the low-softening-temperature optical fiber is likely to shift and the angle between the two optical fibers is likely to tilt, thereby increasing the fusion loss.
3. In the prior art, a discharge electrode is arranged on one side of an optical fiber with high softening temperature, and because the instantaneous temperature of the electrode discharge is high, the electrode needs to be offset by a larger distance in order to accurately control the softening degree of a welding end of the optical fiber with low softening temperature, so that the experiment complexity is increased, and the propelling precision is reduced.
Disclosure of Invention
In view of this, the present invention provides a soft glass optical fiber fusion splicing method, which can provide a uniform, stable and easily controlled thermal field, and can effectively avoid extrinsic connection loss caused by dislocation and bending of a fiber core, thereby improving the fusion splicing efficiency of a characteristic soft glass optical fiber.
The invention provides a soft glass optical fiber welding method, wherein two optical fibers used for welding respectively have different softening temperatures, the optical fiber with the higher softening temperature is called as an optical fiber to be welded, and the soft glass optical fiber has the lower softening temperature, and the method comprises the following steps:
the optical fiber to be welded and the soft glass optical fiber are separated by a set interval and are aligned with each other; arranging a heating element outside the optical fiber to be welded;
starting the heating element, heating the optical fiber to be welded, and indirectly heating the optical fiber end face of the soft glass optical fiber through heat conduction of air; when the end face of the soft glass optical fiber reaches the softening temperature, the optical fiber to be welded is pushed towards the soft glass optical fiber along the axial direction under the condition of keeping the soft glass optical fiber static until the end face of the soft glass optical fiber is contacted with the end face of the optical fiber; at the moment, the heating element continuously heats until the heating time reaches a set heating duration time threshold, the heating is stopped, and after the temperature of the end face of the soft glass optical fiber is reduced, the optical fiber is solidified to form a fusion point.
Further, an offset distance is arranged between the heating element and the end face of the optical fiber to be welded, and the offset distance is set according to the softening temperature of the soft glass optical fiber and the heat conductivity coefficient of the optical fiber to be welded.
Further, the heating element heats the optical fiber to be welded according to a set welding power, and the welding power is based on the condition that the temperature transmitted to the end face of the soft glass optical fiber can reach the softening temperature of the soft glass optical fiber.
Further, the optical fiber to be welded is pushed towards the soft glass optical fiber at a set pushing speed, and when the pushing distance reaches a set hot pushing distance threshold value, the pushing is stopped; the advancing speed and the hot-pushing distance threshold are set so as to realize the standard that the soft glass optical fiber is in contact with the optical fiber to be welded or even overlapped and accumulated; and setting the heating duration threshold value to realize that the temperature of the end face of the soft glass optical fiber reaches above the softening temperature and avoid the generation of fiber core bending of the soft glass optical fiber.
Further, the heating element is a resistance heating wire, the resistance heating wire is an omega-shaped resistance heating wire and surrounds the periphery of the optical fiber to be welded, and the resistance heating wire is made of graphite materials or iridium materials.
Further, the optical fiber to be welded and the soft glass optical fiber are mutually aligned by adopting an active fiber core alignment method.
Further, before the optical fiber to be welded and the soft glass optical fiber are aligned at a set interval, the optical fiber to be welded and the soft glass optical fiber are subjected to optical fiber end face treatment, the optical fiber end face treatment adopts a grinding mode, a chemical stripping method is adopted to remove a coating layer of the special soft glass optical fiber before grinding, and a cleaning agent is adopted to clean the optical fiber after grinding.
Further, the grinding process comprises coarse grinding, fine grinding, ultra-fine grinding and polishing, wherein the coarse grinding, fine grinding and ultra-fine grinding are completed by using a grinding auxiliary agent; polishing is accomplished using a polishing aid.
Further, the grinding aid comprises the following components: 20 percent of Si, and the grain diameter is more than or equal to 30nm and less than or equal to 50 nm; na is less than 0.3 percent; impurities < 0.1%; the PH value is more than or equal to 7.6 and less than or equal to 9.5; the polishing auxiliary agent can be edible oil or turpentine.
Further, the value range of the propelling speed v is more than or equal to 50 and less than or equal to 100, and the unit is as follows: μ m/s; hot push distance L3Has a value range of 0 to L3Less than or equal to 20, the unit is: mu m; duration of heating T2The value range of (1) is more than or equal to T2Is less than or equal to 5, and the unit is: and s.
Has the advantages that:
1. according to the invention, the preheating link is added in the fusion heating process, and a one-way propulsion mode is adopted, the preheating treatment and the heating fusion are carried out according to two stages, the end surface of the soft glass optical fiber is close to the softening degree in the preheating process, and the optical fiber to be fused with higher softening temperature is unidirectionally propelled, so that the fusion of the optical fiber is completed, therefore, the excessively high fusion temperature is not needed, meanwhile, the excessive softening of the soft glass optical fiber can be avoided, and the fusion efficiency is effectively improved;
2. the resistance heating wire is used as the heating element, so that a uniform, stable and easily-controlled thermal field can be provided, and stable fusion can be realized, so that the stability of single fusion efficiency is ensured;
3. according to the invention, by adopting an active fiber core alignment method and a high-softening-temperature optical fiber unidirectional propulsion mode, the extrinsic connection loss caused by fiber core dislocation and bending is avoided;
4. the invention adopts a grinding mode to process the end face of the soft glass optical fiber, can better adapt to the characteristics of crisp texture and low mechanical strength of the soft glass optical fiber, and simultaneously uses the self-made grinding auxiliary agent and the polishing auxiliary agent to solve the problem of easy deliquescence in the ZBLAN optical fiber grinding process.
Drawings
Fig. 1 is a flow chart of a soft glass optical fiber fusion splicing method provided by the invention.
Fig. 2 is a schematic view of an operation structure of a soft glass optical fiber fusion splicing method provided by the present invention.
Fig. 3 is a graph showing the temperature distribution of optical fibers in a method for fusion splicing soft glass optical fibers according to the present invention.
Wherein, 1-single mode 915nm laser diode pumping source (LD); 2-flange plate interface; 3-single mode silica fiber (SMF); 4-resistance heating wire; 5-Soft Glass Fiber (SGF); 6-power detector.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a soft glass optical fiber welding method, which has the following basic idea: the optical fiber with higher softening temperature is heated by adopting the heating element, the heat is indirectly transferred to the soft glass optical fiber with lower softening temperature through the conduction of the optical fiber and air, the optical fiber with higher softening temperature is pushed to the static and stable soft glass optical fiber when the end surface of the optical fiber is close to the softening temperature, and the fusion splicing of the two optical fibers is realized by controlling the heating time and the pushing distance.
The invention provides a soft glass optical fiber fusion splicing method, as shown in figure 1, which comprises the following steps:
step 1, processing the fusion spliced end face of the optical fiber.
The welding end face of the optical fiber is processed by cutting or grinding and the like, so that the angle of the end face can meet the requirement, and the end face is smooth and flat without eccentricity.
Taking the welding of the ZBLAN fiber and the tellurate fiber as an example, the ZBLAN fiber and the tellurate fiber end faces to be welded may be prepared by grinding. Before polishing, the coating of the soft glass fiber is removed by chemical stripping, for example, the coating of the ZBLAN fiber is stripped using dichloromethane gel. Then, grinding the optical fiber, wherein the specific grinding process comprises the following steps: rough grinding → fine grinding → ultra-fine grinding → polishing, in order to avoid the occurrence of deliquescence and repair of the end face of the ZBLAN fiber during grinding, a grinding aid is used in the first four processes, and the main components of the grinding aid are: 20% of Si, particle size: 30-50 nm; na is less than 0.3 percent; impurity < 0.1%, PH: 7.6 to 9.5; the polishing flow uses polishing auxiliary agent, which can be edible oil or turpentine.
For example, the selected grinding paper in each process is: d9-127 → D3-127 → D1-127 → D0.5-127 → ADS-127; the setting of the grinding rotation speed and the slow start time were 8rpm and 8s, respectively, and the setting of the grinding time was 325s → 325s → 325s → 325s → 120 s. After grinding, the tellurate fiber endface was ultrasonically cleaned with alcohol and the ZBLAN fiber endface was ultrasonically cleaned with acetone.
For example, as shown in fig. 2, a single-mode 915nm laser diode pump source 1 is used as a collimation light source and is connected with a single-mode quartz optical fiber 3 through a flange interface 2, a power detector 6 is placed behind a soft glass optical fiber 5, and the fiber core laser passing rate is maximized by manually adjusting an XY alignment component of an optical fiber fusion splicer, so that fiber core alignment is completed; and the interval between the optical fibers on both sides is maintained at the value of the preset gap.
And 3, placing the heating element at the periphery of the optical fiber to be welded with higher softening temperature, wherein the distance between the central point of the heating element and the central point of the preset gap is a set offset distance d.
The heating element can adopt an omega-shaped resistance heating wire and is placed on the periphery of the optical fiber to be welded with higher softening temperature in a surrounding mode so as to improve the uniformity and stability of a thermal field, and the resistance heating wire can be made of graphite materials or iridium materials.
The asymmetric heating structure adopted by the invention forms a gradient temperature distribution field on the optical fiber to be welded and the soft glass optical fiber, the soft glass optical fiber 5 is not directly melted, but the single-mode quartz optical fiber 3 is heated, and then the end part of the heated single-mode quartz optical fiber 3 is used as a heating element of the soft glass optical fiber 5. The typical temperature distribution of the asymmetric heating operation is shown in fig. 3, the highest temperature is at the position of the resistance heating wire 4 on the single-mode silica optical fiber 3, and gradually decreases to the temperature of the end of the single-mode silica optical fiber along with the conduction of the optical fiber; then, the temperature T of the end part of the soft glass optical fiber is conducted to the end part of the soft glass optical fiber through the air gapSGFLower than the temperature T of the end of a single-mode silica optical fiberSMF. Since the temperature of the end of the silica optical fiber can be increased to be higher than that of the end of the soft glass optical fiber, the diffusion process and the chemical reaction process of the thermal diffusion bond formed between the two optical fibers are more efficient, and the optical fiber has good tensile strength. Meanwhile, indirect heating of the soft glass fiber using the silica fiber can provide a more uniform thermal field, whereby the temperature gradient generated between the two fibers is critical to simultaneously achieve a low loss and a high tensile strength melting point.
And 4, cleaning the heating element and the end face of the optical fiber.
And 5, heating and welding.
The heat welding process includes two stages of preheating and continuous heating. The first stage is a preheating stage, the heating element firstly moves to a set position and then begins to release heat, and the heat is transferred to the end face of the soft glass optical fiber to enable the end face of the soft glass optical fiber to reach a softening state; the second stage is a continuous heating stage, the optical fiber with the heating element is pushed to the soft glass optical fiber with lower softening temperature along the axial direction while the heating element is continuously heated, and when the pushing distance reaches a set hot pushing distance threshold value, the pushing is stopped; stopping heating when the heating time of the heating element reaches a set heating duration threshold; when the temperature of the end face of the optical fiber with the lower softening temperature is reduced, the optical fiber is solidified to form a permanent thermal diffusion bond, namely a low-loss fusion point, thereby completing the fusion.
Specifically, the welding process is: advancing the optical fiber to be welded with a heating element to the optical fiber with lower softening temperature at the other side along the axial direction according to a set advancing speed v, and when the advancing distance reaches a pre-advancing distance L2When the welding power is over, the heating element starts heating according to the set welding power P and stops advancing; when the pause time reaches the set hot push delay T1When the heat-pushing distance reaches the set heat-pushing distance L, the heat-pushing device continues to push and enters a continuous heating stage3When the heating element is heated for a set heating duration T, the propulsion is stopped2And stopping heating and waiting for the temperature to be reduced to finish welding. Wherein L is1>L2，L3≥(L1-L2) And is and
in the case where the fusion spliced fibers are a silica fiber and a soft glass fiber, respectively, since the silica fiber has a higher thermal conductivity than the soft glass fiber (e.g., λ)Quartz crystal＝1.38W/m·K,λTellurate salt＝0.56～1.25W/m·K,λZBLAN0.63W/m · K), the temperature of the end face of the soft glass fiber is continuously increased above the softening temperature while the silica fiber is gradually approaching the soft glass fiber until contacting, and the silica fiber is wrapped after softening.
Wherein the value range of the offset distance d is that d is more than or equal to 1100 and less than or equal to 1800, and the unit is: mu m; the value range of the welding power P is more than or equal to 1.5 and less than or equal to 30, and the unit is as follows: w; preset clearanceL1Has a value range of 0.8 to L1Less than or equal to 15, the unit is: mu m; pre-push distance L2Has a value range of not less than 5L2Less than or equal to 20, the unit is: mu m; hot push distance L3Has a value range of 0 to L3Less than or equal to 20, the unit is: mu m; hot push delay T1The value range of (1) is more than or equal to T1Is less than or equal to 5, and the unit is: s; duration of heating T2The value range of (1) is more than or equal to T2Is less than or equal to 5, and the unit is: s; the value range of the propelling speed v is more than or equal to 50 and less than or equal to 100, and the unit is as follows: μ m/s.
And 6, detecting the welding effect to fix the melting point.
The invention can realize the fusion of the optical fibers with different softening temperatures by adjusting parameters, not only comprises the fusion of the soft glass optical fiber and the quartz optical fiber, but also can realize the fusion of the soft glass optical fibers with different materials.
Example 1:
in this embodiment, the soft glass fiber is fused with a single-mode silica fiber, and the fusion splicing method for the soft glass fiber provided by the present invention is used for fusion splicing. In the embodiment, a Vytran large-core optical fiber fusion splicer (GPX-3400) is used for realizing fusion splicing of a soft glass optical fiber and a single-mode quartz optical fiber, wherein the soft glass optical fiber is a tellurate optical fiber, the core diameter of the soft glass optical fiber is 12 microns, the cladding diameter of the soft glass optical fiber is 220 microns, and no coating layer is arranged; the core diameter of the single-mode silica fiber is 9 μm, the cladding diameter is 125 μm, and the coating diameter is 250 μm. In addition, because the fusion welding power required by the soft glass optical fiber fusion welding is low, the fluctuation of the room temperature can have great influence on the fusion welding parameter setting and the fusion welding effect, so the room temperature is controlled to be 19 +/-1 ℃ in the experiment to avoid the influence caused by the change of the room temperature.
And 1.1, processing the end face of the optical fiber.
The quartz and tellurate fibers were cleaved at an angle of 0 degrees using a Vytran fiber cleaver (LDC 400): the optimum cutting tension for a silica fiber with a cladding diameter of 125 μm was 220 g; since the soft glass optical fiber has a brittle texture, a low mechanical strength, and a low young's modulus compared to a silica optical fiber, it is necessary to appropriately reduce the cutting tension when cutting, and the optimal cutting tension for a tellurite optical fiber having a cladding diameter of 220 μm is 200 g.
And 1.2, installing the soft glass optical fiber and the quartz optical fiber.
The Vytran large-core optical fiber fusion splicer (GPX-3400) is used and comprises an optical fiber holder, a heating furnace assembly, a CCD camera for imaging, a computer host and a display which are pre-installed with control software, and a reflector tower for side and end face imaging. As shown in fig. 2, a single-mode silica fiber 3 and a soft glass fiber 5 are respectively installed in fiber holders at two sides of a resistance heating wire 4 of an optical fiber fusion splicer, wherein the single-mode silica fiber 3 is installed at one side of the resistance heating wire 4 biased in the heating process, the resistance heating wire 4 surrounds the single-mode silica fiber 3, and the distance between the center point of the resistance heating wire 4 and the center point of the gap between the fibers at two sides is maintained as a set bias distance d.
And 1.3, setting parameters of a Vytran large-fiber-core optical fiber fusion splicer (GPX-3400).
(1) And setting the offset distance d of the resistance heating wire.
Gradient of temperature distribution during heat conduction
In relation to the offset distance d, the larger the offset distance d, the smaller the slope of the temperature gradient. The allowable offset adjustment range of the experimental conditions is 0-1800 μm. Multiple tests show that when the offset distance d is less than 1200 microns, the change of the set power of the resistance heating wire 4 has a large influence on the temperature of the end part of the soft glass optical fiber, the power regulation precision of the resistance heating wire 4 is reduced, and the small power change can obviously influence the welding efficiency and the strength of a melting point. The offset distance is increased and the adjustment accuracy of the resistance heating wire 4 is increased while a larger welding power or a longer heating time is required. The offset distance d in this example was finally determined by experiment to be 1400 μm. With the offset distance increased, the weld strength decreases.
(2) The fusion splicing power P is set so that the temperature transmitted to the end face of the soft glass optical fiber reaches its softening temperature.
The power required to realize fusion splicing between tellurate optical fibers is 1.5W. This shows that if the resistance heating wire is placed in the center of the fiber gap, the minimum power to achieve fusion splicing is 1.5W. When the offset distance d is set to 1400 μm, the welding power P of the resistance heating wire is increased to 16W, and high-quality welding between the tellurate optical fiber and the quartz optical fiber can be realized. When the fusion splicing power P is low, the melting point strength is low, and the heating time needs to be prolonged to increase the melting point strength, so that the quartz optical fiber is blackened to generate high loss due to the prolonged heating time. When the welding power P is higher than 16W, the core of the tellurate optical fiber is deformed and drooped due to overhigh power, so that the welding efficiency is greatly reduced, and the optimal welding power P is set to be 16W +/-0.5W.
(3) The propulsion speed v is set.
The advancing speed v is based on the speed experienced in the fusion of single-mode silica fibers.
(4) The fiber distance and heating time are set.
The fiber distance includes a predetermined gap L1Pre-push distance L2And hot push distance L3The heating time includes a push-on delay T1And duration T2. Preset gap L1The empirical preset gap for welding the single-mode quartz fiber is taken as a standard. By reasonably setting the pre-push distance L2And hot push delay T1Can control the temperature T of the end face of the soft glass optical fiber in the preheating treatment stageSGFLet T beSGFClose to its softening temperature. Wherein, the pre-push distance L2Less than a predetermined clearance L1Setting the range of 5-8 μm, and the hot push delay T1Not less than L2And/v. Reasonably setting hot push distance L3And duration T2The end face of the soft glass optical fiber can be heated to a temperature higher than the softening temperature in a short time, and the quartz optical fiber is pushed to complete the fusion. Wherein the hot push distance L3Not less than L1-L2And not more than 20 μm. Duration T2The method is extremely short, and avoids the phenomenon that the fiber core is bent due to excessive softening caused by temperature accumulation of the end face of the soft glass optical fiber, so that the welding loss is increased.
TABLE 1 tellurate optical fiber and quartz optical fiber welding parameter table
And 1.4, cleaning the resistance heating wire and the end face of the optical fiber. The fiber end face and the resistance heating wire were cleaned using argon gas. Setting the blowing flow at 0.35l/min, setting the blowing time at 30s, and clicking the purge button to finish blowing cleaning.
And step 1.5, starting welding. And (4) closing the collimation light source, clicking a welding button, welding according to the set parameters, and automatically returning the resistance heating wire to the initial position after the welding is finished.
And 1.6, detecting the welding effect to fix the melting point. And opening a collimation light source to detect the power after welding, and ensuring that the passing rate of the melting point laser reaches the experimental requirement. And (3) closing the collimation light source, using a multidimensional ultrahigh precision manual translation table to movably place the aluminum melting point fixing clamp at the melting point to fix the melting point, coating high-refractive-index fixing glue on the optical fiber in the clamp fixing groove, and using an ultraviolet lamp to irradiate and reinforce the optical fiber, wherein the ultraviolet lamp is used for reinforcing the melting point and pouring cladding laser possibly existing at the melting point, so that the use safety of the high-power laser is ensured.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A soft glass optical fiber fusion splicing method is used for enabling two optical fibers to be fused to have different softening temperatures respectively, wherein the optical fiber with the higher softening temperature is called as an optical fiber to be fused, and the soft glass optical fiber has the lower softening temperature, and is characterized by comprising the following steps of:
the optical fiber to be welded and the soft glass optical fiber are separated by a set interval and are aligned with each other; arranging a heating element outside the optical fiber to be welded;
starting the heating element, heating the optical fiber to be welded, and indirectly heating the optical fiber end face of the soft glass optical fiber through heat conduction of air; when the end face of the soft glass optical fiber reaches the softening temperature, the optical fiber to be welded is pushed towards the soft glass optical fiber along the axial direction under the condition of keeping the soft glass optical fiber static until the end face of the soft glass optical fiber is contacted with the end face of the optical fiber; at the moment, the heating element continuously heats until the heating time reaches a set heating duration time threshold, the heating is stopped, and after the temperature of the end face of the soft glass optical fiber is reduced, the optical fiber is solidified to form a fusion point.
2. The method of claim 1, wherein the heating element is offset from the end face of the optical fiber to be fusion spliced by an offset distance that is set based on a softening temperature of the soft glass optical fiber and a thermal conductivity of the optical fiber to be fusion spliced.
3. The method of claim 1, wherein the heating element heats the optical fiber to be fusion spliced according to a set fusion splicing power that is standardized to a temperature at which the end face of the soft glass optical fiber is transferred to reach its softening temperature.
4. The method of claim 1, wherein the optical fiber to be fusion spliced is advanced toward the soft glass optical fiber at a set advancement speed, and wherein the advancement is stopped when the advancement distance reaches a set hot-push distance threshold; the advancing speed and the hot-pushing distance threshold are set so as to realize the standard that the soft glass optical fiber is in contact with the optical fiber to be welded or even overlapped and accumulated; and setting the heating duration threshold value to realize that the temperature of the end face of the soft glass optical fiber reaches above the softening temperature and avoid the generation of fiber core bending of the soft glass optical fiber.
5. The method according to any one of claims 1 to 4, wherein the heating element is a resistance heating wire, and the resistance heating wire is an omega-shaped resistance heating wire which is arranged around the periphery of the optical fiber to be welded and is made of graphite material or iridium material.
6. The method of claim 5, wherein the optical fiber to be fusion spliced and the soft glass optical fiber are aligned with each other using an active core alignment method.
7. The method according to claim 5, wherein the optical fiber to be fusion spliced and the soft glass optical fiber are subjected to an optical fiber end surface treatment before being aligned with each other at a set interval, the optical fiber end surface treatment is performed by means of grinding, a coating layer of a special soft glass optical fiber is removed by a chemical stripping method before grinding, and the optical fiber is cleaned by a cleaning agent after grinding.
8. The method according to claim 7, wherein the grinding process comprises rough grinding, lapping, fine grinding, ultra-fine grinding and polishing, wherein the rough grinding, lapping, fine grinding and ultra-fine grinding are performed using a grinding aid; polishing is accomplished using a polishing aid.
9. The method according to claim 8, characterized in that the grinding aid has the composition: 20 percent of Si, and the grain diameter is more than or equal to 30nm and less than or equal to 50 nm; na is less than 0.3 percent; impurities < 0.1%; the PH value is more than or equal to 7.6 and less than or equal to 9.5; the polishing auxiliary agent can be edible oil or turpentine.
10. A method according to claim 4, characterized in that the propulsion speed v is in the range 50 ≤ v ≤ 100 in units of: μ m/s; hot push distance L3Has a value range of 0 to L3Less than or equal to 20, the unit is: mu m; duration of heating T2The value range of (1) is more than or equal to T2Is less than or equal to 5, and the unit is: and s.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113955926A (en) * | 2021-12-03 | 2022-01-21 | 吉林大学 | Low-temperature fusion welding method for improving strength of fusion welding point between soft glass optical fiber and quartz optical fiber |
| CN114924353A (en) * | 2022-05-27 | 2022-08-19 | 哈尔滨工程大学 | Low-loss fusion welding method for fluorine tellurate glass fiber and quartz fiber |
| CN116880013A (en) * | 2023-07-19 | 2023-10-13 | 密尔医疗科技(深圳)有限公司 | Optical fiber fusion splicing method |
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| CN113955926A (en) * | 2021-12-03 | 2022-01-21 | 吉林大学 | Low-temperature fusion welding method for improving strength of fusion welding point between soft glass optical fiber and quartz optical fiber |
| CN114924353A (en) * | 2022-05-27 | 2022-08-19 | 哈尔滨工程大学 | Low-loss fusion welding method for fluorine tellurate glass fiber and quartz fiber |
| CN114924353B (en) * | 2022-05-27 | 2023-09-29 | 哈尔滨工程大学 | Low-loss fusion welding method for fluorine tellurate glass optical fiber and quartz optical fiber |
| CN116880013A (en) * | 2023-07-19 | 2023-10-13 | 密尔医疗科技(深圳)有限公司 | Optical fiber fusion splicing method |
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