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WO2010097872A1 - Fibre optique pour amplification optique, et laser à fibre - Google Patents

Fibre optique pour amplification optique, et laser à fibre Download PDF

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Publication number
WO2010097872A1
WO2010097872A1 PCT/JP2009/006243 JP2009006243W WO2010097872A1 WO 2010097872 A1 WO2010097872 A1 WO 2010097872A1 JP 2009006243 W JP2009006243 W JP 2009006243W WO 2010097872 A1 WO2010097872 A1 WO 2010097872A1
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Prior art keywords
core
concentration
optical fiber
optical
optical amplification
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PCT/JP2009/006243
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English (en)
Japanese (ja)
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荒井智史
市井健太郎
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株式会社フジクラ
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Publication of WO2010097872A1 publication Critical patent/WO2010097872A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
    • C03B37/01838—Reactant delivery systems, e.g. reactant deposition burners for delivering and depositing additional reactants as liquids or solutions, e.g. for solution doping of the deposited glass
    • 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
    • C03C13/00—Fibre or filament compositions
    • C03C13/04—Fibre optics, e.g. core and clad fibre compositions
    • C03C13/045—Silica-containing oxide glass compositions
    • C03C13/046—Multicomponent glass compositions
    • 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
    • C03C4/00—Compositions for glass with special properties
    • C03C4/0071—Compositions for glass with special properties for laserable glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/06—Doped silica-based glasses
    • C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
    • C03B2201/28—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/06—Doped silica-based glasses
    • C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
    • C03B2201/34—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers
    • C03B2201/36—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers doped with rare earth metals and aluminium, e.g. Er-Al co-doped
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1691—Solid materials characterised by additives / sensitisers / promoters as further dopants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/17—Solid materials amorphous, e.g. glass
    • H01S3/176—Solid materials amorphous, e.g. glass silica or silicate glass

Definitions

  • the present invention relates to an optical fiber for optical amplification and a fiber laser using the same.
  • This application claims priority based on Japanese Patent Application No. 2009-043963 for which it applied to Japan on February 26, 2009, and uses the content here.
  • Fiber lasers have a high conversion efficiency from pumping light to laser light (hereinafter simply referred to as “conversion efficiency”) and superior beam quality, output stability, and cooling efficiency compared to conventional solid-state lasers.
  • conversion efficiency a fiber laser using a Yb-doped optical fiber with ytterbium (Yb) added to the core as an optical fiber for optical amplification
  • Yb ytterbium
  • a high-power LD light source for Yb excitation can be used. Therefore, it is expected to be used in various fields as an industrial optical fiber laser.
  • the transmission loss of the core portion gradually increases with the incidence and transmission of the excitation light to the optical fiber. As a result, the laser output may decrease.
  • the increase in transmission loss of the core due to the incidence / transmission of the excitation light is generally called photodarkening, but its manifestation mechanism is not completely clarified.
  • Non-Patent Document 1 reports that photodarkening is suppressed by co-adding Yb and aluminum (Al) to the core.
  • Patent Document 1 and Non-Patent Document 2 report that photodarkening is suppressed by co-adding Yb and phosphorus (P) to the core.
  • the gain fluctuation of optical amplification is small with respect to the wavelength fluctuation of pumping light. This is because the smaller the dependence of the gain on the pumping light wavelength, the less the influence of individual differences in the pumping light source and the change in the output wavelength due to temperature, resulting in improved output stability of the fiber laser. . Moreover, since the selection range of the wavelength of the excitation light source is expanded, it contributes to the cost reduction of the fiber laser. As one method for reducing the dependence of the gain on the pumping light wavelength, it is known to flatten the absorption spectrum of the optical fiber for optical amplification.
  • wavelengths 915 nm and 976 nm with Yb absorption peaks, and an LD of 940 nm located between them are used as main excitation light sources.
  • the absorption spectrum near these wavelengths is not flat.
  • the above-mentioned prior art documents do not mention the problem of fluctuation of the core light absorption amount (hereinafter simply referred to as “absorption amount”) in the vicinity of a wavelength of 940 nm.
  • the technique described in the above prior art document cannot be said to have a sufficient effect of suppressing photodarkening.
  • the present invention has been made in view of the above circumstances, and an optical amplifying optical fiber that can reduce fluctuations in the amount of absorption in the vicinity of a wavelength of 940 nm and can suppress an increase in transmission loss due to photodarkening and the same are used.
  • An object is to provide a fiber laser.
  • An optical fiber for optical amplification according to the present invention is an optical fiber for optical amplification composed of a silica glass optical fiber composed of a core and a clad covering the outer periphery of the core. 3 wt% Yb, 3 to 15 wt% P, and 0 to 10 wt% Al; the concentration ratio of P and Yb contained in the core (P concentration (wt%) / Yb concentration (wt %)) Is 3 or more; the concentration ratio of P and Al contained in the core (P concentration (wt%) / Al concentration (wt%)) is 1 or more.
  • a fiber laser of the present invention is a fiber having an optical amplification optical fiber made of a silica glass optical fiber composed of a core and a clad covering the outer periphery of the core, and an excitation light source that emits excitation light
  • the optical amplification optical fiber includes 0.5 to 3 wt% Yb, 3 to 15 wt% P, and 0 to 10 wt% Al in the core;
  • the concentration ratio of P and Yb P concentration (wt%) / Yb concentration (wt%)) is 3 or more; the concentration ratio of P and Al contained in the core (P concentration (wt%)) / Al concentration (wt%)) is 1 or more.
  • the core contains 0.5 to 3 wt% Yb, 3 to 15 wt% P, and 0 to 10 wt% Al, and the concentration of P and Yb
  • the ratio to 3 or more and the concentration ratio of P and Al to 1 or more
  • fluctuations in the amount of absorption in a region near the wavelength of 940 nm eg, 930 to 950 nm
  • the fluctuation of the absorption amount in the region near the wavelength of 940 nm can be reduced by adding P to the core and setting the concentration within the above range.
  • the fluctuation of the absorption amount can be reduced in this way, the gain fluctuation of the optical amplification with respect to the wavelength fluctuation of the pumping light can be reduced. Further, the addition of P can suppress an increase in transmission loss due to photodarkening. Therefore, the output stability of the fiber laser is improved. Further, since the selection range of the wavelength of the excitation light source is expanded, the cost of the fiber laser can be reduced.
  • the absorption spectrum in the Example and comparative example of the optical fiber for optical amplification of this invention is shown.
  • 6 is a graph showing the relationship between the P / Yb concentration ratio and the absorption fluctuation rate in the wavelength range of 930 to 950 nm in Examples and Comparative Examples of the optical fiber for optical amplification of the present invention.
  • 3 is a graph showing the relationship between the P / Al concentration ratio and the absorption fluctuation rate in the wavelength range of 930 to 950 nm in Examples and Comparative Examples of the optical fiber for optical amplification of the present invention.
  • the optical fiber for optical amplification of the present invention comprises a quartz glass optical fiber composed of at least a core and a clad covering the outer periphery of the core.
  • the core of the optical fiber for optical amplification contains at least 0.5 to 3 wt% Yb, 3 to 15 wt% P, and 0 to 10 wt% Al.
  • the concentration ratio of P and Yb contained in the core (P concentration (wt%) / Yb concentration (wt%)) is 3 or more.
  • the concentration ratio of P and Al contained in the core P concentration (wt%) / Al concentration (wt%)) is 1 or more. This will be described in detail below.
  • Yb is a dopant having an optical amplification effect.
  • the Yb concentration of the core is 0.5 to 3 wt%, preferably 1 to 2.5 wt%.
  • the Yb concentration is less than 0.5 wt%, the amount of light absorption becomes small and the light amplification effect is reduced. It is difficult to make the Yb concentration higher than 3 wt% because of the manufacturing method. For this reason, by adding Yb in the above concentration range to the core, an optical fiber having an excellent optical amplification function can be obtained.
  • the present invention by incorporating P in the core at a predetermined concentration, it is possible to suppress fluctuations in the amount of absorption in a region near a wavelength of 940 nm (for example, 930 to 950 nm).
  • the P concentration of the core is 3 to 15 wt%.
  • the P concentration is less than 3 wt%, the effect of suppressing fluctuations in the amount of absorption in the region near the wavelength of 940 nm is reduced.
  • the photodarkening suppressing action is reduced.
  • the range where the P concentration exceeds 15 wt% there is no significant change in the amount of absorption in the region near the wavelength of 940 nm.
  • P in the above-mentioned concentration range to the core, fluctuations in the amount of absorption in the region near the wavelength of 940 nm can be reduced, and photodarkening can be suppressed.
  • the Al concentration of the core is 0 to 10 wt%, preferably 0.1 to 10 wt%.
  • crystallization of Yb is suppressed during manufacture of the base material, and this Yb diffuses into the base material. For this reason, photodarkening is suppressed by adding Al in the above concentration range to the core. Further, since crystallization of Yb during the manufacturing of the base material is suppressed, it is possible to suppress the devitrification of the base material. For this reason, the yield at the time of base material manufacture improves.
  • the Al concentration of the core is higher than the above range, Al crystallization may occur.
  • the amount of absorption in the region near the wavelength of 940 nm varies greatly, and the absorption spectrum in the region near the wavelength does not easily become flat.
  • the present inventor has found for the first time that fluctuations in absorption in the region near the wavelength of 940 nm can be reduced by adding P to the core and setting the concentration within a predetermined range with respect to the concentrations of Yb and Al. Completed the invention.
  • the concentration ratio of P and Yb (P concentration (wt%) / Yb concentration (wt%)) (hereinafter referred to as P / Yb concentration ratio) is 3 or more, and the concentration ratio of P and Al ( If the P concentration (wt%) / Al concentration (wt%) (hereinafter referred to as the P / Al concentration ratio) is 1 or more, fluctuations in absorption in the region near the wavelength of 940 nm can be suppressed, and photodarkening can be achieved. Suppression is possible.
  • the variation of the absorption amount in the region near the wavelength of 940 nm can be evaluated by the variation rate of the absorption amount.
  • the fluctuation rate of the absorption amount is expressed by the following formula, and serves as an index representing the flatness of the absorption spectrum.
  • Absorption rate fluctuation rate (maximum absorption amount-minimum absorption amount) / (maximum absorption amount + minimum absorption amount) / 2 x 100 (%)
  • the maximum value and the minimum value of the absorption amount are the maximum value and the minimum value of the absorption amount at a wavelength of 930 to 950 nm.
  • the fluctuation rate of the absorption amount is ideally zero, but if it is 20% or less, it is considered to be a practical level.
  • the optical fiber for optical amplification of the present invention can be manufactured by a known method except that a predetermined amount of Yb, P, and Al is added to the core.
  • an optical fiber preform is prepared by MCVD (MCVD: Modified Chemical Vapor Deposition), VAD (Vapor phase Axial Deposition), etc., this is spun, and a protective coating layer is formed on the outer periphery.
  • MCVD Modified Chemical Vapor Deposition
  • VAD Vapor phase Axial Deposition
  • the base material is manufactured through a quartz glass fine particle (soot) deposition process, a liquid immersion process, a sintering process, and a solidification process.
  • the quartz tube is heated by an oxyhydrogen burner while supplying a mixed gas containing silicon tetrachloride (SiCl 4 ), oxygen (O 2 ) and the like as a raw material gas into the quartz tube.
  • SiCl 4 silicon tetrachloride
  • O 2 oxygen
  • phosphoryl chloride (POCl 3 ) is mixed with the source gas and supplied into the quartz tube, so that P can be added to the deposit simultaneously with the soot deposition.
  • the supply amount of POCl 3 is adjusted so that the P concentration of the core falls within the above range.
  • the quartz tube depositing the soot is charged with an aqueous solution of ytterbium chloride (YbCl 3) and aluminum chloride (AlCl 3).
  • YbCl 3 ytterbium chloride
  • AlCl 3 aluminum chloride
  • the supply amounts of Yb and Al are adjusted by adjusting the concentrations of YbCl 3 and AlCl 3 in the aqueous solution, so that the concentrations of Yb and Al in the core are within the above range.
  • This immersion process can be omitted when Yb and Al are supplied simultaneously with the soot deposition process using a DND (Direct Nanoparticle Deposition) method or an aerosol method.
  • DND Direct Nanoparticle Deposition
  • the quartz tube is heated by an oxyhydrogen burner while supplying a mixed gas containing O 2 , He, and the like into the quartz tube. Thereby, soot is sintered and vitrified.
  • the quartz tube is heated to, for example, about 2000 ° C. with an oxyhydrogen burner while O 2 is supplied into the quartz tube. Thereby, the quartz tube is solidified and an optical fiber preform is obtained.
  • An optical fiber for optical amplification can be obtained by spinning this optical fiber preform and forming a protective coating layer on the outer periphery with a UV curable resin or the like.
  • a fiber laser having at least the optical amplification optical fiber and an excitation light source that emits excitation light.
  • An LD laser diode
  • the optical fiber for optical amplification of the present invention it is possible to reduce the fluctuation of the absorption amount in the region near the wavelength of 940 nm.
  • P By adding P to the core and setting its concentration within a predetermined range, fluctuations in the amount of absorption in the region near the wavelength of 940 nm can be reduced.
  • the fluctuation of the absorption amount can be reduced, the gain fluctuation of the optical amplification with respect to the wavelength fluctuation of the pumping light can be reduced.
  • the addition of P can suppress an increase in transmission loss due to photodarkening. Therefore, the output stability of the fiber laser is improved. Further, since the selection range of the wavelength of the excitation light source is expanded, the cost of the fiber laser can be reduced.
  • Example 1 While the mixed gas containing SiCl 4 and POCl 3 was supplied into the quartz tube by the MCVD method, the quartz tube was heated by an oxyhydrogen burner to deposit soot on the inner wall surface of the quartz tube (soot deposition step). The quartz tube on which the soot was deposited was dipped in an aqueous solution of YbCl 3 and AlCl 3 and then dried (immersion process). Then, while supplying a mixed gas of O 2 and He into the quartz tube, the quartz tube was heated by oxyhydrogen burner, and sintered soot (sintering step).
  • the quartz tube was heated to about 2000 ° C. with an oxyhydrogen burner to solidify the quartz tube to obtain an optical fiber preform (solidification step).
  • An optical fiber for optical amplification was obtained by melting and spinning the optical fiber preform and forming a protective coating layer on the outer periphery with a UV curable resin or the like.
  • the concentration of Yb, P and Al in the core of this optical fiber for optical amplification was measured by EPMA (Electron Probe Micro Analyzer). The results are shown in Table 1. As shown in Table 1, the concentrations of Yb, P, and Al were 0.5 wt%, 8.8 wt%, and 0.1 wt%, respectively. The P / Yb concentration ratio of the core was 17.6, and the P / Al concentration ratio was 88.0. The solid line in FIG. 1 shows the absorption spectrum of this optical fiber for amplification. From this figure, it can be seen that in the optical amplifying optical fiber of Example 1, the variation in the amount of absorption in the wavelength range of 930 to 950 nm is relatively small. As shown in Table 1, the fluctuation rate of the absorption amount of the optical amplification optical fiber of Example 1 was 8.7%.
  • Example 2 An optical fiber for optical amplification was produced in the same manner as in Example 1 except that the flow rate of POCl 3 in the soot deposition process and the concentrations of YbCl 3 and AlCl 3 in the aqueous solution used in the immersion process were different. As shown in Table 1, the concentrations of Yb, P, and Al in the core were 3.0 wt%, 16.5 wt%, and 5.2 wt%, respectively. The P / Yb concentration ratio of the core was 6.1, and the P / Al concentration ratio was 3.2. The variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 8.3%.
  • Example 3 It was produced optical fiber for optical amplification in POCl 3 flow rates, and other than the concentration of YbCl 3 and AlCl 3 in aqueous solution used in the immersion step vary in Example 1 and similar methods in soot deposition processes. As shown in Table 1, the concentrations of Yb, P, and Al in the core were 0.9 wt%, 3.0 wt%, and 0.8 wt%, respectively. The P / Yb concentration ratio of the core was 3.3, and the P / Al concentration ratio was 3.8. The variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 13.1%.
  • Example 4 An optical fiber for optical amplification was produced in the same manner as in Example 1 except that the flow rate of POCl 3 in the soot deposition process and the concentrations of YbCl 3 and AlCl 3 in the aqueous solution used in the immersion process were different. As shown in Table 1, the concentrations of Yb, P, and Al in the core were 2.7 wt%, 15.0 wt%, and 5.2 wt%, respectively. The P / Yb concentration ratio of the core was 5.6, and the P / Al concentration ratio was 2.9. The variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 8.3%.
  • Example 5 After soot was deposited on the inner wall surface of the quartz tube, the soot was immersed in an aqueous solution of YbCl 3 . After drying, while supplying a mixed gas of O 2 and He into the quartz tube, the quartz tube was heated with an oxyhydrogen burner to sinter the soot. Next, the quartz tube was solidified by the same burner as in Example 1 to obtain an optical fiber preform. This optical fiber preform was spun and a protective coating layer was formed to obtain an optical fiber for optical amplification. Other conditions were the same as in Example 1. As shown in Table 1, the concentrations of Yb and P in the core were 0.6 wt% and 8.8 wt%, respectively. The P / Yb concentration ratio of the core was 14.7. The variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 10.4%.
  • Example 6 An optical fiber for optical amplification was produced in the same manner as in Example 1 except that the flow rate of POCl 3 in the soot deposition process and the concentrations of YbCl 3 and AlCl 3 in the aqueous solution used in the immersion process were different. As shown in Table 1, the concentrations of Yb, P, and Al in the core were 1.0 wt%, 10.9 wt%, and 10.0 wt%, respectively. The P / Yb concentration ratio of the core was 10.9, and the P / Al concentration ratio was 1.1. The variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 2.3%.
  • Example 7 An optical fiber for optical amplification was produced in the same manner as in Example 1 except that the flow rate of POCl 3 in the soot deposition process and the concentrations of YbCl 3 and AlCl 3 in the aqueous solution used in the immersion process were different. As shown in Table 1, the concentrations of Yb, P, and Al in the core were 2.2 wt%, 6.6 wt%, and 0.2 wt%, respectively. The P / Yb concentration ratio of the core was 3.0, and the P / Al concentration ratio was 33.0. The variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 12.5%.
  • Example 8 An optical fiber for optical amplification was produced in the same manner as in Example 1 except that the flow rate of POCl 3 in the soot deposition process and the concentrations of YbCl 3 and AlCl 3 in the aqueous solution used in the immersion process were different. As shown in Table 1, the concentrations of Yb, P, and Al in the core were 1.5 wt%, 8.1 wt%, and 7.9 wt%, respectively. The P / Yb concentration ratio of the core was 5.4, and the P / Al concentration ratio was 1.0. The variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 5.4%.
  • Comparative Example 1 For comparison, for the purpose of optical amplification in the same manner as in Example 1 except that the flow rate of POCl 3 in the soot deposition process was reduced and the concentrations of YbCl 3 and AlCl 3 in the aqueous solution used in the immersion process were different.
  • An optical fiber was produced.
  • the concentrations of Yb, P, and Al in the core were 1.2 wt%, 3.3 wt%, and 3.1 wt%, respectively.
  • the P / Yb concentration ratio of the core was 2.8, and the P / Al concentration ratio was 1.1.
  • the broken line in FIG. 1 shows the absorption spectrum of this optical fiber for optical amplification.
  • the variation in the amount of absorption in the wavelength range of 930 to 950 nm is relatively large.
  • the fluctuation rate of the absorption amount was 56.0%.
  • “Comparative Example 2” An optical fiber for optical amplification is produced in the same manner as in Example 1 except that the flow rate of POCl 3 in the soot deposition process is reduced and the concentrations of YbCl 3 and AlCl 3 in the aqueous solution used in the immersion process are different. did.
  • the Yb, P, and Al concentrations in the core were 1.4 wt%, 4.2 wt%, and 4.7 wt%, respectively.
  • the P / Yb concentration ratio of the core was 3.0, and the P / Al concentration ratio was 0.9.
  • the variation rate of the absorption amount in the wavelength range of 930 to 950 nm was 33.4%.
  • FIG. 2 is a graph showing the relationship between the P / Yb concentration ratio and the fluctuation rate of the absorption amount in the wavelength range of 930 to 950 nm in the examples and comparative examples.
  • FIG. 3 is a graph showing the relationship between the P / Al concentration ratio and the fluctuation rate of the absorption amount in the wavelength range of 930 to 950 nm in the examples and comparative examples. 3 and 4, when the P / Yb concentration ratio is 3 or more and the P / Al concentration ratio is 1 or more, the variation rate of the absorption amount in the wavelength region 930 to 950 nm may be 20% or less. Recognize.
  • the optical fiber for optical amplification of the present invention it is possible to reduce the fluctuation of the absorption amount in the region near the wavelength of 940 nm (for example, 930 to 950 nm). Therefore, the gain variation of the optical amplification with respect to the wavelength variation of the pumping light can be reduced. Further, the addition of P can suppress an increase in transmission loss due to photodarkening. Therefore, the output stability of the fiber laser is improved. Further, since the selection range of the wavelength of the excitation light source is expanded, the cost of the fiber laser can be reduced.

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Abstract

L'invention porte sur une fibre optique pour amplification optique qui comprend une fibre optique en verre de silice constituée d'un cœur et d'une gaine couvrant la périphérie extérieure du cœur. Le cœur contient de 0,5 à 3 % en poids de Yb, de 3 à 15 % en poids de P, et de 0 à 10 % en poids de Al; le rapport de concentration de P et Yb contenus dans le cœur (concentration de P (% en poids)/concentration de Yb (% en poids)) est de 3 ou plus; et le rapport de concentration de P et Al contenus dans le cœur (concentration de P (% en poids)/concentration de Al (% en poids)) est de 1 ou plus.
PCT/JP2009/006243 2009-02-26 2009-11-19 Fibre optique pour amplification optique, et laser à fibre WO2010097872A1 (fr)

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JP2014143287A (ja) * 2013-01-23 2014-08-07 Mitsubishi Cable Ind Ltd 希土類添加光ファイバ及びその製造方法

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