CN115057631A - Bleaching method and device for reducing photodarkening induction loss - Google Patents
Bleaching method and device for reducing photodarkening induction loss Download PDFInfo
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- 238000004061 bleaching Methods 0.000 title claims abstract description 161
- 230000006698 induction Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000013307 optical fiber Substances 0.000 claims abstract description 139
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 40
- 239000001301 oxygen Substances 0.000 claims description 40
- 229910052760 oxygen Inorganic materials 0.000 claims description 40
- 230000003287 optical effect Effects 0.000 claims description 34
- 235000005811 Viola adunca Nutrition 0.000 claims description 26
- 240000009038 Viola odorata Species 0.000 claims description 26
- 235000013487 Viola odorata Nutrition 0.000 claims description 26
- 235000002254 Viola papilionacea Nutrition 0.000 claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 244000172533 Viola sororia Species 0.000 claims description 4
- 230000008439 repair process Effects 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 32
- 238000007789 sealing Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 239000007844 bleaching agent Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910052769 Ytterbium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/62—Surface treatment of fibres or filaments made from glass, minerals or slags by application of electric or wave energy; by particle radiation or ion implantation
- C03C25/6206—Electromagnetic waves
- C03C25/6226—Ultraviolet
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/62—Surface treatment of fibres or filaments made from glass, minerals or slags by application of electric or wave energy; by particle radiation or ion implantation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
Abstract
The invention relates to the technical field of laser, and discloses a bleaching method and a device for reducing photodarkening induction loss, wherein the bleaching method for reducing photodarkening induction loss adopts gas bleaching and multiband photobleaching gain optical fibers, measures the relative change of red light power of red light emitted by a red light source after the red light passes through the gain optical fibers, avoids the problem of insufficient photodarkening repair of the gain optical fibers by a single bleaching means, and can fully repair various defects of photodarkening, enhance photodarkening recovery and reduce photodarkening induction loss to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a bleaching method and a bleaching device for reducing photodarkening induction loss.
Background
Industrial continuous fiber lasers have been widely used in numerous fields such as mechanical engineering manufacturing, parts processing, automobile and home appliance manufacturing, airplane and motor car production, new energy battery welding, rapid repair, 3D printing, etc. with their numerous advantages. The stability of laser power is crucial to the laser processing application, and insufficient laser power can cause the problems of reduced processing quality, insufficient processing efficiency, increased processing error, overhigh energy consumption and the like in the processing process, and can also cause the rejection of processed workpieces to generate serious consequences in serious cases. Because the high-power optical fiber laser generally adopts the ytterbium ion-doped optical fiber as a gain medium, the ytterbium ion-doped optical fiber can generate photon darkening induction loss in the long-time use process, which can cause the increase of the background loss of the optical fiber from visible light to a waveband of 900-1100 nm, and further cause the reduction of the output power and the indication light power of the optical fiber laser; the photodarkening induction loss becomes one of important factors influencing the stability of the output power of the high-power optical fiber laser, and how to reduce the photodarkening induction loss becomes an important matter for improving the long-time power stability of the optical fiber laser.
The commonly used means for reducing the photodarkening mainly comprises three means, one is to adjust and optimize the proportioning components, design structure and manufacturing process of the gain optical fiber, and directly reduce the photodarkening induction loss from the angle of modifying the optical fiber, and the method is often more complex and requires higher requirements on the capability of designing and manufacturing the gain optical fiber, as described in patents CN201110076289.1 and CN 201710583330.1; secondly, the overall design of the matched optical components and the optical light path system around the gain optical fiber is adjusted, and the method needs the matching and matching of other optical components to be more difficult to execute and the effect is often unstable; thirdly, the gain optical fiber which generates the photon darkening induction loss recovers partial photon darkening effect by utilizing the photobleaching effect, the thermal bleaching effect and the gas bleaching effect, reduces the additional photon darkening induction loss, and is not practical because the optical fiber is damaged by the thermal bleaching effect due to the high temperature.
At present, the techniques disclosed in patents CN201910249405.1, CN201910600937.5 and CN201510354909.1 are all based on the photon bleaching effect to suppress or reduce the photon darkening effect or induced loss, and the disclosed techniques are all the use of a single light source, which cannot perform unified repair for various defects generated after the photon darkening of the gain fiber, and cannot determine the optimal bleaching power and bleaching time, and the process of photo-bleaching cannot be monitored in real time.
Disclosure of Invention
Based on the method, the photodarkening induction loss in the gain fiber is reduced by utilizing the photobleaching and gas bleaching effects, various defects of photodarkening can be fully repaired, the photodarkening recovery performance is enhanced, the photodarkening induction loss is reduced to the maximum extent, and the method has certain process operability and practicability.
In a first aspect, the present invention provides a bleaching method for reducing photodarkening induction loss, comprising the steps of:
s11, bleaching the gain optical fiber by pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
s12, performing ultraviolet light irradiation on the gain optical fiber bleached by the pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
s13, carrying out blue light bleaching on the gain optical fiber after ultraviolet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
s14, carrying out blue-violet bleaching on the gain optical fiber subjected to blue light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
and S15, carrying out green light bleaching on the gain optical fiber subjected to blue-violet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable.
In a second aspect, the present invention provides a bleaching device for reducing photodarkening induction loss, comprising: the device comprises a red light source, an ultraviolet lamp, a gain optical fiber, a light power detector, a sealed box body filled with oxygen and at least one bleaching light source, wherein the output end of the red light source and the output end of the bleaching light source are both connected with the input end of the gain optical fiber; when oxygen is used for bleaching the gain optical fiber, the gain optical fiber is placed in the box body filled with the oxygen.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a bleaching method for reducing photodarkening induction loss, which comprises the following steps: s11, bleaching the gain optical fiber by pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable; s12, performing ultraviolet light irradiation on the gain optical fiber bleached by the pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
s13, carrying out blue light bleaching on the gain optical fiber subjected to ultraviolet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable; s14, carrying out blue-violet light bleaching on the gain optical fiber after blue light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable; and S15, carrying out green light bleaching on the gain optical fiber subjected to blue-violet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable. Compared with the prior art, the method comprehensively utilizes gas bleaching and multiband photobleaching, avoids the problem of insufficient photon darkening repair by a single bleaching means, can fully repair various defects of photon darkening, enhance photon darkening recovery, and reduce photon darkening induction loss to the maximum extent.
In addition, the invention provides a bleaching device for reducing photodarkening induction loss, the bleaching method is adopted to bleach the gain optical fiber, the whole process of photodarkening induction loss reduction can be quantitatively monitored in real time, and appropriate bleaching time and parameters can be found as soon as possible to avoid waste.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limited to, the accompanying figures in which like reference numerals refer to similar elements and in which the figures are not to scale unless otherwise specified.
FIG. 1 is a schematic flow chart of a bleaching method for reducing photodarkening induced loss according to an embodiment of the present invention;
FIG. 2 is a graph showing the trend of the relative change of red light measurements increasing with time in the trend of reduction of photodarkening induced loss in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a bleaching apparatus for reducing photodarkening induction loss according to an embodiment of the present invention;
FIG. 4 is a schematic diagram based on the structure of the oxygen bleached gain fiber in FIG. 3;
FIG. 5 is a schematic diagram of a gain fiber bleached by UV light based on the UV lamp radiation shown in FIG. 3;
fig. 6 is a schematic structural diagram of a blue light bleaching light source, a blue-violet light bleaching light source, and a green light bleaching light source bleaching gain fiber in fig. 3.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "disposed on"/"disposed on" another element, it can be directly on the other element or intervening elements may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In addition, in this specification, the words "first" and "second" do not limit data and execution order, but distinguish substantially the same item or similar items in function and action, and do not limit embodiments of the present invention. The output end and the input end of the invention refer to the input and the output of the laser.
Specifically, the present embodiment is further explained below with reference to the drawings.
The embodiment of the invention provides a bleaching method for reducing photodarkening induction loss, which comprises the following steps of:
and S11, bleaching the gain optical fiber by pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable.
The step S11 specifically includes: s111, arranging the gain optical fiber in a sealed box body filled with oxygen; s112, sequentially connecting a red light source, a gain optical fiber and a mold stripper, and arranging an optical power detector at the output end of the mold stripper; s113, starting a red light source, and measuring the red light power output from the mould stripping device through a light power detector; and S114, when the red light power value measured by the light power detector reaches a stable value, closing the red light source, and taking out the gain optical fiber bleached by the oxygen.
Further, in the embodiment, in step S11, the gain optical fiber after being subjected to the photo-darkening is placed in a sealed box body filled with oxygen, and a first sealing ring and a second sealing ring are respectively disposed on two opposite sides of the sealed box body, so as to ensure that when the input end of the gain optical fiber passes through the sealed box body via the first sealing ring, and the output end of the gain optical fiber passes through the sealed box body via the second sealing ring, the sealing performance of the sealed box body is damaged. The air pressure of the oxygen in the sealed box body is 3-6 standard atmospheric pressures. When the input end and the output end of the gain optical fiber respectively penetrate out of the two sides of the sealed box body, the red light source is connected with the input end of the gain optical fiber, the output end of the gain optical fiber is connected with the input end of the mold stripping device, and the output end of the mold stripping device is provided with the optical power detector. And then starting a red light source, measuring the red light power output from the mode stripper by using an optical power detector along with the time extension, and recording the corresponding time T1 when the red light power reaches a stable state, wherein when the measured red light power value is not increased any more, namely the red light power value reaches a stable value, the oxygen bleaching of the gain optical fiber with the photon darkening induction loss is saturated or balanced, and finally, the red light source is closed and the gain optical fiber is taken out.
And S12, performing ultraviolet light irradiation on the gain optical fiber bleached by the pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable.
The step S12 specifically includes: s121, sequentially connecting a red light source, the gain optical fiber bleached by oxygen and the mold stripping device, placing the optical power detector at the output end of the mold stripping device, and placing the ultraviolet lamp at the peripheral side of the gain optical fiber bleached by oxygen; s122, turning on a red light source and an ultraviolet lamp, and measuring the red light power output from the mold stripping device through an optical power detector; and S123, when the red light power value measured by the light power detector reaches a stable value, turning off the red light source and the ultraviolet lamp, and taking out the gain optical fiber bleached by the ultraviolet lamp.
Further, in the embodiment, step S12 may be understood that, since the gain fiber is disposed in the sealed box body filled with oxygen in step S11, in this step, the gain fiber bleached by oxygen taken out in step S11 needs to be connected to the red light source and the mode stripper, respectively, that is, the output end of the red light source is connected to the input end of the gain fiber, the output end of the gain fiber is connected to the input end of the mode stripper, the output end of the mode stripper is provided with an optical power detector, and the peripheral side of the gain fiber is provided with an ultraviolet lamp. The gain optical fibers are uniformly wound and fixed to prevent the gain optical fibers from being overlapped with each other, and the gain optical fibers are ensured to be radiated comprehensively by ultraviolet light emitted by the ultraviolet lamp. And then turning on the ultraviolet lamp and the red light source to enable ultraviolet light to be uniformly irradiated on all gain optical fibers, measuring the red light power output from the output end of the mode stripper by using the optical power detector, and recording the corresponding time T2 when the red light power reaches a stable state, wherein the red light power measured by the optical power detector is increased along with the increase of the irradiation time of the ultraviolet lamp, and when the red light power measured by the optical power detector is not increased any more, namely the red light power value reaches a stable value, the ultraviolet light bleaching with the photodarkening induction loss is saturated or balanced. And finally, the ultraviolet lamp is turned off to stop ultraviolet light bleaching and a red light source, and the bleached gain optical fiber is taken out.
It should be noted that, in step S11, the gain fiber is disposed in the oxygen-filled sealed box body, the input end of the gain fiber passes through the first sealing ring and out of the sealed box body, and the output end of the gain fiber passes through the second sealing ring and out of the sealed box body to seal the tightness of the box body, so that the input end and the output end of the gain fiber are not sufficiently or not bleached by oxygen, and in order to avoid the influence of the insufficient or not bleached gain fiber on the measurement of the red light power in step S12, the insufficient or not bleached portion of the input end and the output end of the gain fiber needs to be removed, and then the gain fiber is connected to the red light source and the mode stripper respectively.
And S13, carrying out blue light bleaching on the gain optical fiber subjected to ultraviolet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable.
The step S13 specifically includes: the S131 is sequentially connected with a blue light bleaching light source, a beam combiner, a gain optical fiber bleached by ultraviolet light and a mold stripping device, a light power detector is arranged at the output end of the mold stripping device, and the output end of a red light source is connected with the input end of the beam combiner; s132, starting a blue light bleaching light source and a red light source, and measuring the red light power output from the mold stripping device through a light power detector; and S133, when the red light power value measured by the light power detector reaches a stable value, the blue light bleaching light source and the red light source are closed.
Further, in step S13, the output end of the blue light bleaching light source and the output end of the red light source are both connected to the input end of the beam combiner, the output end of the beam combiner is connected to the input end of the gain fiber, the output end of the gain fiber is connected to the input end of the mode stripper, and the output end of the mode stripper is provided with an optical power detector. And then starting the blue light bleaching light source and the red light source, wherein the central wavelength of the blue light emitted by the blue light source is 450nm, and the output power is 0.1-3W. And measuring the red light power output from the output end of the mode stripper by using the optical power detector, and recording the corresponding time T3 when the red light power reaches a stable state, wherein the red light power value measured by the optical power detector gradually increases along with the increase of the working time of the blue light bleaching light source, when the measured red light power value does not increase any more, namely the red light power value reaches a stable value, the blue light bleaching with photodarkening induction loss is saturated or balanced, the blue light bleaching light source and the red light source are closed, and the bleached gain optical fiber is taken out.
And S14, carrying out blue-violet light bleaching on the gain optical fiber after blue light bleaching, and measuring the blue-violet light power output from the gain optical fiber until the blue-violet light power value is stable.
The step S14 specifically includes: s141, connecting the output end of the blue and violet light bleaching light source with the input end of a beam combiner; s142, starting a blue-violet light bleaching light source and a red light source, and measuring the red light power output from the mold stripping device through a light power detector; and S143, when the red light power value measured by the light power detector reaches a stable value, the blue-violet light bleaching light source and the red light source are closed.
Further, in the embodiment, in step S14, the output end of the blue-violet light bleaching light source and the output end of the red light source are both connected to the input end of the beam combiner, the output end of the beam combiner is connected to the input end of the gain optical fiber, the output end of the gain optical fiber is connected to the input end of the mode stripper, and the output end of the mode stripper is provided with the optical power detector; and then starting a blue-violet light bleaching light source and a red light source, wherein the central wavelength of the blue-violet light bleaching light source is 405nm, the output power is 0.5-5W, the red light power output from the output end of the mold stripper is measured by the optical power detector, the corresponding time T4 when the red light power reaches a stable state is recorded, the red light power value measured by the optical power detector is gradually increased along with the increase of the working time of the blue-violet light bleaching light source, when the measured red light power value is not increased any more, namely the red light power value reaches a stable value, the blue-violet light bleaching loss induced by photon darkening is saturated or balanced, the blue-violet light bleaching light source and the red light source are closed, and the bleached gain optical fiber is taken out.
And S15, carrying out green light bleaching on the gain optical fiber subjected to blue-violet light bleaching, and measuring the green light power output from the gain optical fiber until the green light power value is stable.
The step S15 specifically includes: s151, connecting the output end of the green light bleaching light source with the input end of the beam combiner; s152, starting a green light bleaching light source and a red light source, and measuring the red light power output from the output end of the mold stripping device through a light power detector; and S153, when the red light power value measured by the power detector reaches a stable value, the green light bleaching light source and the red light source are closed.
Further, in the embodiment, in step S15, the output end of the green light bleaching light source and the output end of the red light source are both connected to the input end of the beam combiner, the output end of the beam combiner is connected to the input end of the gain optical fiber, the output end of the gain optical fiber is connected to the input end of the mode stripper, and the output end of the mode stripper is provided with an optical power detector; and then starting a green light bleaching light source and a red light source, wherein the center wavelength of the green light bleaching light source is 520nm, the output power is 0.1-0.5W, the red light power output from the output end of the mold stripper is measured by adopting the optical power detector, the corresponding time T5 when the red light power reaches a stable state is recorded, the red light power value measured by the optical power detector is gradually increased along with the increase of the working time of the green light bleaching light source, when the measured red light power value is not increased any more, namely the red light power value reaches a stable value, the green light bleaching loss induced by photon darkening is saturated or balanced, the green light bleaching light source and the red light source are closed, and the bleached gain optical fiber is taken out.
The present embodiment adopts the above steps S11 to S15, i.e., the operation sequence S11 to S15, which is convenient for bleaching the gain fiber, reduces the waiting time for bleaching the gain fiber, and is also beneficial for batch processing of the gain fiber to be bleached. Furthermore, with this bleaching sequence implemented, the ability to eliminate photodarkening can be enhanced relatively smoothly and maximally, as shown in FIG. 2, which is a graph of the trend of the relative change in red measurements increasing with time in the trend of decreasing photodarkening induced losses. It can be obviously obtained that under the condition of different bleaching each time, the relative trend of stable balance of the red light power can be obtained by measuring the red light power passing through the gain optical fiber.
In the present embodiment, the center wavelength of the red light output by the red light source is 650nm, and the output power is 30-100 mW. In the embodiment, the red light source with the wave band of 650nm is used as the calibration light source of the photodarkening induction loss, so that the influence of the red light source on the bleaching effect of the gain optical fiber can be avoided, and the characteristic that the photodarkening induction loss is obvious in the wave band of 650nm can be utilized, so that the measurement sensitivity of the optical power detector is improved, and the tiny photodarkening induction loss in the process can be recovered and detected. In this embodiment, the mode stripper can strip the red light and other band light that have not been transmitted in the cladding through the fiber core clean to avoid affecting the measurement accuracy.
In addition, an embodiment of the present invention further provides a bleaching apparatus for reducing photodarkening induction loss, which can bleach a gain fiber by using the bleaching method for reducing photodarkening induction loss described in this embodiment, as shown in fig. 3.
The embodiment provides a bleaching device for reducing photodarkening induction loss, which comprises: the device comprises a red light source 1, an ultraviolet lamp 5, a gain optical fiber 3, a light power detector 6, a sealed box body 4 filled with oxygen and at least one bleaching light source 2, wherein the output end of the red light source 1 and the output end of the bleaching light source 2 are both connected with the input end of the gain optical fiber 3, the light power detector 6 is arranged at the output end of the gain optical fiber 3, and the ultraviolet lamp 5 is arranged on the peripheral side of the gain optical fiber 3; when the gain optical fiber 3 is bleached by oxygen, the gain optical fiber 3 is placed in the box 4 filled with oxygen.
Further, in order to improve the bleaching efficiency and the measurement accuracy of the optical power detector, the bleaching apparatus for reducing the photodarkening induction loss according to the embodiment further includes: the output ends of the red light source 1 and the bleaching light source 2 are connected with the input end of the beam combiner 7, the output end of the beam combiner 7 is connected with the input end of the gain optical fiber 3, the output end of the gain optical fiber 3 is connected with the input end of the mode stripper 8, and the output end of the mode stripper 8 is provided with an optical power detector 6.
Further, in this embodiment, when oxygen is used to bleach the gain optical fiber 3, as shown in fig. 4, for the specific bleaching device for reducing the photo darkening induction loss in oxygen bleaching, the gain optical fiber 3 is disposed in the box 4 filled with oxygen, and a first sealing ring 41 and a second sealing ring 42 are respectively disposed on two opposite sides of the sealed box 4, so as to ensure that when the input end of the gain optical fiber 3 penetrates out of the sealed box 4 through the first sealing ring 41, and the output end of the gain optical fiber 3 penetrates out of the sealed box 4 through the second sealing ring 42, the sealing performance of the sealed box 4 is damaged. After the input end and the output end of the gain optical fiber 3 respectively penetrate out of the two sides of the sealed box body 4, the red light source 1 is connected with the input end of the gain optical fiber 3, the output end of the gain optical fiber 3 is connected with the input end of the mold stripping device 8, and the output end of the mold stripping device 8 is provided with the optical power detector 6. And measuring the red light power output from the output end of the mode stripper 8 through the optical power detector 6, judging whether the gain optical fiber 3 is repaired under the condition of oxygen, and recording the time T1 required by the oxygen repair (bleaching) of the gain optical fiber 3.
Further, in this embodiment, when the gain optical fiber 3 is bleached by using ultraviolet light, as shown in fig. 5, the red light source 1, the gain optical fiber 3, and the mode stripper 8 are sequentially connected to a specific bleaching apparatus for reducing photodarkening induction loss in ultraviolet light bleaching, the output end of the mode stripper 8 is provided with the optical power detector 6, and the ultraviolet lamp 5 is disposed on the peripheral side of the gain optical fiber 3. Bleaching the gain optical fiber 3 by turning on an ultraviolet lamp 5 to radiate ultraviolet light, judging whether the gain optical fiber 3 is repaired in an ultraviolet light waveband by measuring the red light power output from the output end of a mode stripper 8, and recording the time T2 required by the repair (bleaching) of the gain optical fiber 3 in the ultraviolet light waveband.
Further, in this embodiment, the bleaching light source 2 includes: as shown in fig. 6, the output ends of the red light source 1, the blue light bleaching light source 21, the blue-violet light bleaching light source 22, and the green light bleaching light source 23 are all connected to the input end of the beam combiner 7, the output end of the beam combiner 7 is connected to the input end of the gain fiber 3, the output end of the gain fiber 3 is connected to the input end of the mode stripper 8, the output end of the mode stripper 8 is provided with the optical power detector 6, the individual bleaching of the gain fiber 3 is realized by individually controlling the on and off of the blue light bleaching light source 21, the blue-violet light bleaching light source 22, and the green light bleaching light source 23, the optical power detector 6 measures the power of the gain fiber after passing through the gain fiber 3 and the output end of the mode stripper 8 under the condition of blue light, blue-violet light, or green light, until the red power stabilizes. Wherein, the time T3 required by the red light power to reach the stability is recorded by the gain fiber 3 under the condition of blue light bleaching; when the gain optical fiber 3 is bleached by blue and violet light, recording the time T4 required by the red light power reaching stability; when the gain fiber 3 was bleached in the green, the time T5 required for the red power to stabilize was recorded.
In summary, the embodiment of the present invention provides a bleaching method for reducing photodarkening induction loss, including the steps of: s11, bleaching the gain optical fiber by pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable; s12, carrying out ultraviolet light irradiation on the gain optical fiber bleached by the pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable; s13, carrying out blue light bleaching on the gain optical fiber subjected to ultraviolet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable; s14, carrying out blue-violet light bleaching on the gain optical fiber after blue light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable; and S15, carrying out green light bleaching on the gain optical fiber subjected to blue-violet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable. Compared with the prior art, the embodiment comprehensively utilizes gas bleaching and multiband photobleaching, avoids the problem of insufficient photon darkening repair by a single bleaching means, can fully repair various defects of photon darkening, enhance photon darkening recovery, and reduce photon darkening induction loss to the maximum extent.
In addition, the invention provides a bleaching device for reducing photodarkening induction loss, the bleaching method is adopted to bleach the gain optical fiber, the whole process of photodarkening induction loss reduction can be quantitatively monitored in real time, and proper bleaching time and parameters can be found as soon as possible to avoid waste.
The embodiment of the present invention provides a bleaching method and apparatus for reducing photodarkening induction loss, and the method and apparatus are described in detail above, and the specific embodiments are used herein to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core concept of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A bleaching method for reducing photodarkening induction loss, comprising the steps of:
s11, bleaching the gain optical fiber by pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
s12, performing ultraviolet light irradiation on the gain optical fiber bleached by the pressurized oxygen, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
s13, carrying out blue light bleaching on the gain optical fiber after ultraviolet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
s14, carrying out blue-violet bleaching on the gain optical fiber subjected to blue light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable;
and S15, carrying out green light bleaching on the gain optical fiber subjected to blue-violet light bleaching, and measuring the red light power output from the gain optical fiber until the red light power value is stable.
2. The bleaching method for reducing photodarkening induction loss according to claim 1, wherein the step S11 is specifically: s111, arranging the gain optical fiber in a sealed box body filled with oxygen; s112, sequentially connecting a red light source, a gain optical fiber and a mold stripping device, and arranging an optical power detector at the output end of the mold stripping device; s113, starting a red light source, and measuring the red light power output from the mold stripping device through a light power detector; and S114, when the red light power value measured by the light power detector reaches a stable value, closing the red light source, and taking out the gain optical fiber bleached by the oxygen.
3. The bleaching method for reducing photodarkening induction loss according to claim 1, wherein the step S12 is specifically: s121, sequentially connecting a red light source, the gain optical fiber bleached by oxygen and the mold stripping device, placing the optical power detector at the output end of the mold stripping device, and placing the ultraviolet lamp at the peripheral side of the gain optical fiber bleached by oxygen; s122, turning on a red light source and an ultraviolet lamp, and measuring the red light power output from the mold stripping device through an optical power detector; and S123, when the red light power value measured by the light power detector reaches a stable value, turning off the red light source and the ultraviolet lamp, and taking out the gain optical fiber bleached by the ultraviolet light.
4. The bleaching method for reducing photodarkening induction loss according to claim 1, wherein the step S13 is specifically: s131, sequentially connecting a blue light bleaching light source, a beam combiner, a gain optical fiber bleached by ultraviolet light and a mode stripper, arranging an optical power detector at the output end of the mode stripper, and connecting the output end of a red light source with the input end of the beam combiner; s132, starting a blue light bleaching light source and a red light source, and measuring the red light power output from the mold stripping device through a light power detector; and S133, when the red light power value measured by the light power detector reaches a stable value, the blue light bleaching light source and the red light source are closed.
5. The bleaching method for reducing photodarkening induction loss according to claim 4, wherein the step S14 is specifically: s141, connecting the output end of the blue and violet light bleaching light source with the input end of a beam combiner; s142, starting a blue-violet light bleaching light source and a red light source, and measuring the red light power output from the mold stripping device through a light power detector; and S143, when the red light power value measured by the light power detector reaches a stable value, the blue-violet light bleaching light source and the red light source are closed.
6. The bleaching method for reducing photodarkening induction loss according to claim 4, wherein the step S15 is specifically: s151, connecting the output end of the green light bleaching light source with the input end of the beam combiner; s152, starting a green light bleaching light source and a red light source, and measuring the red light power output from the output end of the mold stripping device through a light power detector; and S153, when the red light power value measured by the power detector reaches a stable value, the green light bleaching light source and the red light source are closed.
7. The bleaching method for reducing photodarkening induction loss according to any of claims 2-6, wherein the red light source outputs red light with a central wavelength of 650nm and an output power of 30-100 mW.
8. A bleaching device for reducing photodarkening induction losses, comprising: the device comprises a red light source, an ultraviolet lamp, a gain optical fiber, a light power detector, a sealed box body filled with oxygen and at least one bleaching light source, wherein the output end of the red light source and the output end of the bleaching light source are both connected with the input end of the gain optical fiber; when oxygen is used for bleaching the gain optical fiber, the gain optical fiber is placed in the box body filled with the oxygen.
9. The bleaching apparatus for reducing photodarkening induction losses of claim 8, wherein the bleaching light source comprises: the output end of the red light source, the output end of the blue light bleaching light source, the output end of the blue and violet light bleaching light source and the output end of the green light bleaching light source are connected with the input end of the gain optical fiber.
10. The bleaching device for reducing photodarkening induction losses of claim 8, comprising: the output ends of the red light source and the bleaching light source are connected with the input end of the beam combiner, the output end of the beam combiner is connected with the input end of the gain optical fiber, the output end of the gain optical fiber is connected with the input end of the mode stripper, and the output end of the mode stripper is provided with an optical power detector.
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