WO2012172996A1 - Fibre optique à amplification multicœur - Google Patents

Fibre optique à amplification multicœur Download PDF

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Publication number
WO2012172996A1
WO2012172996A1 PCT/JP2012/064170 JP2012064170W WO2012172996A1 WO 2012172996 A1 WO2012172996 A1 WO 2012172996A1 JP 2012064170 W JP2012064170 W JP 2012064170W WO 2012172996 A1 WO2012172996 A1 WO 2012172996A1
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WO
WIPO (PCT)
Prior art keywords
core
refractive index
optical fiber
amplification optical
inner cladding
Prior art date
Application number
PCT/JP2012/064170
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English (en)
Japanese (ja)
Inventor
幸寛 土田
勝徳 今村
繁弘 高坂
杉崎　隆一
Original Assignee
古河電気工業株式会社
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Publication of WO2012172996A1 publication Critical patent/WO2012172996A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
    • G02B6/0285—Graded index layer adjacent to the central core segment and ending at the outer cladding index
    • 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06729—Peculiar transverse fibre profile
    • 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06729—Peculiar transverse fibre profile
    • H01S3/06737—Fibre having multiple non-coaxial cores, e.g. multiple active cores or separate cores for pump and gain
    • 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
    • H01S3/06754—Fibre amplifiers

Definitions

  • the present invention relates to a multi-core amplification optical fiber.
  • Patent Document 1 discloses a multi-core amplification optical fiber for an optical fiber laser in which a plurality of rare earth-added core portions are arranged in a clad.
  • Patent Document 2 discloses a multicore optical fiber amplifier for collectively amplifying signal light propagated through a multicore optical transmission line.
  • some of the conventional rare earth-doped amplification optical fibers in which one core is disposed near the central axis of the optical fiber employ a double clad structure.
  • a component (skew component) that does not contribute to excitation is generated in the excitation light because it does not reach the core part, so that the excitation efficiency is poor. It has been. Therefore, in order to disturb the skew component and efficiently absorb the skew component, a method is used in which the cross-sectional shape of the inner cladding is a flower shape, a polygonal shape, or a D shape (see Patent Document 3).
  • the amount of light that excites a plurality of existing core portions varies due to the influence of a skew component or the like, and thus there is a problem that the light amplification characteristics of each core portion also vary.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a multi-core amplification optical fiber in which variations in optical amplification characteristics of each core part are suppressed.
  • a multi-core amplification optical fiber is provided with a plurality of core portions to which a rare earth element is added and the outer periphery of the plurality of core portions, An inner cladding part having a refractive index lower than the refractive index of the core part, and an outer cladding layer located on the outer periphery of the inner cladding part and having a refractive index lower than the refractive index of the inner cladding part,
  • the inner cladding portion has a region including at least one core portion of the plurality of core portions, and the region has a refractive index distribution shape in which a refractive index increases toward the at least one core portion. It is characterized by.
  • the multi-core amplification optical fiber according to the present invention has a plurality of core portions to which rare earth elements are added and an outer periphery of the plurality of core portions, and has a refractive index lower than that of the plurality of core portions.
  • a plurality of holes disposed so as to surround the plurality of core portions, and the inner cladding portion is at least one core portion of the plurality of core portions.
  • the region has a refractive index distribution shape in which a refractive index increases toward the at least one core portion.
  • the multi-core amplification optical fiber according to the present invention is characterized in that, in the above-mentioned invention, the at least one core portion is located near a central axis in a cross section of the multi-core amplification optical fiber.
  • the multi-core amplification optical fiber according to the present invention is characterized in that, in the above invention, the inner cladding portion has a refractive index distribution in which a refractive index increases from an outer peripheral side toward the at least one core portion. .
  • the multi-core amplification optical fiber according to the present invention is characterized in that, in the above-described invention, the inner clad portion has two or more of the regions.
  • the multi-core amplification optical fiber according to the present invention is characterized in that, in the above-mentioned invention, the plurality of core portions are arranged at positions shifted from lattice points of the triangular lattice in the cross section of the multi-core amplification optical fiber.
  • FIG. 1 is a diagram illustrating a schematic cross section and a refractive index distribution of a multi-core amplification optical fiber according to the first embodiment.
  • FIG. 2 is a diagram showing a schematic cross section of a conventional multi-core amplification optical fiber, a refractive index distribution, and a state of a skew component of pumping light.
  • FIG. 3 is a diagram illustrating a state of a skew component of pumping light in the multi-core amplification optical fiber illustrated in FIG.
  • FIG. 4 is a diagram showing a schematic cross section and a refractive index distribution of the multi-core amplification optical fiber according to the second embodiment.
  • FIG. 5 is a schematic cross-sectional view of a multi-core amplification optical fiber according to the third embodiment.
  • FIG. 6 is a schematic cross-sectional view of a multi-core amplification optical fiber according to the fourth embodiment.
  • FIG. 1 is a schematic cross-sectional view of a multi-core amplification optical fiber according to the first embodiment.
  • the multi-core amplification optical fiber 10 is positioned on the outer periphery of the core portion 11 in total, including seven core portions 11 arranged so as to form a substantially regular hexagon so as to surround the central axis and surround the central axis.
  • an outer clad layer 13 located on the outer periphery of the inner clad portion 12.
  • the inner cladding portion 12 has a refractive index lower than that of the core portion 11.
  • the outer cladding layer 13 has a refractive index lower than that of the inner cladding portion 12.
  • the core 11 is made of quartz glass to which a dopant that increases the refractive index, such as germanium (Ge), is added.
  • the outer cladding layer 13 is made of, for example, an optical resin.
  • the refractive index of the optical resin is, for example, 1.1 to 1.42.
  • FIG. 1 shows a refractive index distribution in the section AA.
  • the distribution P1 is a refractive index distribution of the core portion 11, and the distribution P2 is a refractive index distribution of the inner cladding portion 12.
  • the inner cladding portion 12 has a so-called graded index type refractive index distribution in which the refractive index increases toward the core portion 11 located near the central axis in the entire cross-sectional area.
  • Such a refractive index distribution can be realized by configuring the inner cladding portion 12 with quartz-based glass containing a dopant for increasing the refractive index in a concentration distribution corresponding to the refractive index distribution.
  • the core part 11 is added with rare earth elements.
  • the rare earth element added is erbium (Er), ytterbium (Yb), neodymium (Nd), thulium (Tm), or the like.
  • the amount of rare earth element added is, for example, 50 ppm to 2000 ppm in the case of Er.
  • the core portion 11 has a core diameter of 1 ⁇ m to 5 ⁇ m, and a relative refractive index difference with respect to the inner cladding portion 12 in a region adjacent to the core portion 11 is 0.5% to 2.0%.
  • the core diameter and relative refractive index difference of the core portion 11 may be equal to each other or different from each other.
  • the core part 11 is arranged on a lattice point of a triangular lattice.
  • the distance between adjacent cores in the core part 11 is such a distance that the crosstalk of light between the cores does not adversely affect the optical characteristics of the core part 11, and for example, a core whose extinction ratio is ⁇ 30 dB or less.
  • the distance is set.
  • the core part 11 has a core diameter of 1 ⁇ m to 5 ⁇ m as described above and the relative refractive index difference with respect to the inner cladding part 12 is 0.5% to 2.0%
  • the distance between the cores is preferably 30 ⁇ m or more.
  • the distance between the cores is 60 ⁇ m or less because the outer diameter of the fiber is not so large and the outer diameter of the inner cladding portion 12 can be about 125 ⁇ m to 250 ⁇ m.
  • the multi-core amplification optical fiber 10 has a double clad structure, and propagates signal light having a wavelength of an optical amplification band of a rare earth element (for example, 1.5 ⁇ m band in the case of Er) to the core portion 11, while transmitting the inner cladding.
  • a rare earth element for example, 1.5 ⁇ m band in the case of Er
  • excitation light having a wavelength in the excitation band of rare earth elements for example, 0.98 ⁇ m band or 1.48 ⁇ m band in the case of Er
  • the excitation light is confined in the inner clad part 12 and propagates while being transmitted to the core part 11.
  • Excites rare earth elements added to the As a result, the rare earth element exhibits an optical amplification effect and amplifies the light propagating through the core portion 11.
  • the inner cladding portion 12 has a refractive index distribution in which the refractive index increases toward the core portion 11 located in the vicinity of the central axis, and thus variation in the amount of light that excites each core portion 11. Is suppressed.
  • FIG. 2 is a diagram showing a schematic cross section of a conventional multi-core amplification optical fiber, a refractive index distribution, and a state of a skew component of pumping light.
  • the multi-core amplification optical fiber 10A includes a total of seven core parts 11A arranged so as to form a substantially regular hexagon so as to surround the central axis and surround the central axis, an inner cladding part 12A located on the outer periphery of the core part 11A, It is the same as the multi-core amplification optical fiber 10 shown in FIG. 1 in that it includes an outer cladding layer (not shown) located on the outer periphery of the inner cladding portion 12A.
  • FIG. 2 shows a refractive index distribution in the section BB.
  • Distribution P3 is the refractive index distribution of the core portion 11A
  • distribution P4 is the refractive index distribution of the inner cladding portion 12A.
  • the inner cladding portion 12A is different from the inner cladding portion 12 of the multi-core amplification optical fiber 10 in that it has a uniform refractive index in the cross section.
  • the skew component SL1 included in the pumping light propagating through the inner cladding portion 12A travels along an optical path that does not reach some core portions 11A.
  • FIG. 3 is a diagram showing the state of the skew component of the pumping light in the multi-core amplification optical fiber 10 shown in FIG.
  • the inner cladding portion 12 has a refractive index distribution in which the refractive index increases toward the core portion 11 located near the central axis.
  • the skew component SL2 included in the pumping light gathers at the center of the multi-core amplification optical fiber 10, and variation in the amount of pumping light that pumps each core unit 11 is suppressed.
  • the core portion 11 near the central axis which is difficult to reach the skew component in the related art, is also sufficiently excited.
  • variations in the optical amplification characteristics of the core portions 11 are suppressed.
  • the optical amplification characteristics of the core portions 11 are made more uniform.
  • the refractive index distribution of the inner cladding portion 12 is such that the relative refractive index difference of the central portion of the inner cladding portion 12 with respect to the outermost peripheral side of the inner cladding portion 12 is greater than 0.5% and not more than 3.5%. Is preferably 1 to 10.
  • ⁇ is a well-known parameter called ⁇ value representing the shape of the graded index type refractive index distribution.
  • the entire cross-sectional area of the inner cladding portion 12 has a graded index type refractive index distribution, but the inner cladding portion 12 includes a region including the seven core portions 11 as the center.
  • a graded index type refractive index distribution shape in which the refractive index increases toward the core portion 11 located near the axis may be used, and there may be a region having a uniform refractive index on the outer peripheral side of the region.
  • FIG. 4 is a schematic cross-sectional view of a multi-core amplification optical fiber according to the second embodiment.
  • the multi-core amplification optical fiber 20 like the multi-core amplification optical fiber 10, has a total of seven core portions 21 arranged so as to form a substantially regular hexagon so as to surround the center axis and surround the center axis.
  • an inner cladding portion 22 located on the outer periphery of the core portion 21 and an outer cladding layer 23 located on the outer periphery of the inner cladding portion 22.
  • Each characteristic of the core part 21 and the outer clad layer 23, for example, the relationship between the constituent material, the size, the distance between the cores, or the refractive index, is the same as the corresponding element in the first embodiment.
  • FIG. 4 shows the refractive index distribution in the CC cross section.
  • the distribution P5 is the refractive index distribution of the core portion 21, and the distribution P6 is the refractive index distribution of the inner cladding portion 22.
  • the inner cladding portion 22 has a graded index type refraction in which each region including the core portions 21 included in the CC cross section has a refractive index increasing toward the core portions 21. It has a rate distribution shape.
  • each region including the core portion 21 has a graded index type refractive index distribution shape in which the refractive index increases toward each core portion 21.
  • the skew component included in the pumping light gathers in each core part 21 of the multi-core amplification optical fiber 20, and variation in the amount of pumping light that pumps each core part 21 is suppressed.
  • the optical amplification characteristics of the core portions 21 are made more uniform.
  • the refractive index distribution shape in each region including each core portion 21 has an ⁇ value and a specific refraction for each region so as to cause concentration of skew components so that variations in optical amplification characteristics of each core portion 21 are suppressed. It is preferable to set the rate difference as appropriate.
  • the region where the graded index type refractive index distribution shape is provided may not be provided for all of the core portions included in the multi-core amplification optical fiber, and is preferably provided for at least one core portion.
  • FIG. 5 is a schematic cross-sectional view of a multi-core amplification optical fiber according to the third embodiment.
  • the multi-core amplification optical fiber 30 includes seven core portions 31, an inner cladding portion 32 located on the outer periphery of the core portion 31, and an outer cladding layer 33 located on the outer periphery of the inner cladding portion 32. I have.
  • Each characteristic of the core part 31, the inner clad part 32, and the outer clad layer 33 such as a constituent material, a size, a distance between the cores, a refractive index distribution shape, or a refractive index, is the same as the corresponding element in the first embodiment. It is.
  • the seven core portions 31 are arranged at positions shifted from the lattice points LP of the triangular lattice L.
  • the core part does not necessarily have to be arranged on the lattice points of the triangular lattice, and may be displaced.
  • the difference in distance between the core portions is preferably 0.5 ⁇ m to 10 ⁇ m.
  • a method of manufacturing a multi-core amplification optical fiber in which the position of the core portion deviates from the triangular lattice point in this way for example, a method using play of a glass rod or a glass tube to be stacked in a known stack and draw method, There are methods using glass rods and glass tubes having different diameters.
  • FIG. 6 is a schematic cross-sectional view of a multi-core amplification optical fiber according to the fourth embodiment.
  • the multi-core amplification optical fiber 40 includes a core portion 41 and a clad portion 42 located on the outer periphery of the core portion 41.
  • a plurality of holes 44 are formed in the cladding portion 42 so as to surround the core portion 41.
  • the hole 44 is elliptical and is bent in an arc shape.
  • the excitation light is confined and propagated in the inner region 42a of the cladding part 42 surrounded by the holes 44 by a plurality of holes 44 functioning as an air cladding.
  • the core part 41 and the cladding part 42 are the same as the corresponding element in the first embodiment.
  • the cladding portion 42 is a graded index type in which the refractive index increases toward the core portion 41 located near the central axis in the entire region of the cross section excluding the air holes 44, as in the refractive index distribution of FIG. It has a refractive index distribution.
  • the skew component of the pumping light generated in the inner region 42a is collected at the center by the refractive index distribution of the cladding part 42, so that the optical amplification characteristics of each core part 41 are made more uniform. .
  • the number of core portions included in the multi-core amplification optical fiber is seven.
  • the number of core portions is not particularly limited as long as it is plural, and may be three, for example.
  • the cross-sectional shape may be a flower shape, a polygonal shape, or a D shape.
  • the present invention is not limited by the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention.
  • a region having a graded index type refractive index distribution shape may be provided for each core portion as in the second embodiment. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.
  • the multi-core amplification optical fiber according to the present invention is suitable mainly for use in optical communication.
  • Multi-core amplification optical fiber 11, 21, 31, 41 Core portion 12, 22, 32 Inner cladding portion 13, 23, 33 Outer cladding layer 42 Cladding portion 42a Inner region 44 Hole L Triangular lattice LP lattice Point P1, P2, P3, P4, P5, P6 Distribution SL1, SL2 Skew component

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

L'invention concerne une fibre optique à amplification multicœur qui comprend : une pluralité de sections de cœur auxquelles un élément de terres rares a été ajouté ; une section de gaine interne qui est positionnée à la périphérie externe de la pluralité de sections de cœur et qui possède un indice de réfraction inférieur à celui de la pluralité de sections de cœur ; et une couche de gaine externe qui est positionnée à la périphérie externe de la section de gaine interne et qui possède un indice de réfraction inférieur à celui de section de gaine interne. La section de gaine interne comporte une zone qui inclut au moins une section de cœur parmi la pluralité de sections de cœur et la zone a une forme de distribution d'indice de réfraction qui fait que l'indice de réfraction augmente vers la ou les sections de cœur. La présente invention permet ainsi de réduire les variations des caractéristiques d'amplification optique entre chaque section de cœur.
PCT/JP2012/064170 2011-06-16 2012-05-31 Fibre optique à amplification multicœur WO2012172996A1 (fr)

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US201161497786P 2011-06-16 2011-06-16
US61/497,786 2011-06-16

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Cited By (8)

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JP2014017457A (ja) * 2012-07-11 2014-01-30 Kohoku Kogyo Co Ltd 希土類元素添加ファイバ、及びそれを用いたファイバレーザ並びにファイバ型増幅器
WO2014132990A1 (fr) * 2013-02-26 2014-09-04 古河電気工業株式会社 Structure de faisceau en fibre optique, fibre à cœurs multiples dopés aux terres rares, structure de connexion correspondante, procédé pour exciter des fibres à cœurs multiples dopés aux terres rares, et amplificateur à fibre optique à cœurs multiples
JP5635654B1 (ja) * 2013-06-28 2014-12-03 日本電信電話株式会社 マルチコアファイバ接続部品
WO2016027896A1 (fr) * 2014-08-22 2016-02-25 住友電気工業株式会社 Fibre optique
JP2018198287A (ja) * 2017-05-24 2018-12-13 日本電信電話株式会社 増幅用ファイバ
CN111517637A (zh) * 2020-05-22 2020-08-11 长飞光纤光缆股份有限公司 掺稀土多芯光纤、光纤预制棒及其制备方法和应用
JPWO2021199193A1 (fr) * 2020-03-30 2021-10-07
WO2022039073A1 (fr) * 2020-08-17 2022-02-24 古河電気工業株式会社 Fibre d'amplification optique, amplificateur à fibre optique et système de communication optique

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014017457A (ja) * 2012-07-11 2014-01-30 Kohoku Kogyo Co Ltd 希土類元素添加ファイバ、及びそれを用いたファイバレーザ並びにファイバ型増幅器
WO2014132990A1 (fr) * 2013-02-26 2014-09-04 古河電気工業株式会社 Structure de faisceau en fibre optique, fibre à cœurs multiples dopés aux terres rares, structure de connexion correspondante, procédé pour exciter des fibres à cœurs multiples dopés aux terres rares, et amplificateur à fibre optique à cœurs multiples
US9692201B2 (en) 2013-02-26 2017-06-27 Furukawa Electric Co., Ltd. Optical-fiber-bundle structure, rare-earth-doped multi-core fiber, connection structure therefor, method for exciting rare-earth-doped multi-core fibers, and multi-core-optical-fiber amplifier
JP2015012152A (ja) * 2013-06-28 2015-01-19 日本電信電話株式会社 マルチコアファイバ接続部品
JP5635654B1 (ja) * 2013-06-28 2014-12-03 日本電信電話株式会社 マルチコアファイバ接続部品
WO2016027896A1 (fr) * 2014-08-22 2016-02-25 住友電気工業株式会社 Fibre optique
JPWO2016027896A1 (ja) * 2014-08-22 2017-06-15 住友電気工業株式会社 光ファイバ
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JP2018198287A (ja) * 2017-05-24 2018-12-13 日本電信電話株式会社 増幅用ファイバ
JPWO2021199193A1 (fr) * 2020-03-30 2021-10-07
WO2021199193A1 (fr) * 2020-03-30 2021-10-07 日本電信電話株式会社 Amplificateur à fibre optique et fibre optique à ajout de terres rares
JP7338787B2 (ja) 2020-03-30 2023-09-05 日本電信電話株式会社 光ファイバ増幅器及び希土類添加光ファイバ
CN111517637A (zh) * 2020-05-22 2020-08-11 长飞光纤光缆股份有限公司 掺稀土多芯光纤、光纤预制棒及其制备方法和应用
CN111517637B (zh) * 2020-05-22 2021-04-27 长飞光纤光缆股份有限公司 掺稀土多芯光纤、光纤预制棒及其制备方法和应用
WO2022039073A1 (fr) * 2020-08-17 2022-02-24 古河電気工業株式会社 Fibre d'amplification optique, amplificateur à fibre optique et système de communication optique

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