WO2022029872A1 - Fibre optique et système de transmission à fibre optique - Google Patents

Fibre optique et système de transmission à fibre optique Download PDF

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Publication number
WO2022029872A1
WO2022029872A1 PCT/JP2020/029775 JP2020029775W WO2022029872A1 WO 2022029872 A1 WO2022029872 A1 WO 2022029872A1 JP 2020029775 W JP2020029775 W JP 2020029775W WO 2022029872 A1 WO2022029872 A1 WO 2022029872A1
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WIPO (PCT)
Prior art keywords
optical fiber
core
clad
present disclosure
acoustic
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PCT/JP2020/029775
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English (en)
Japanese (ja)
Inventor
隆 松井
陽子 山下
和秀 中島
泰志 坂本
信智 半澤
則幸 荒木
真一 青笹
諒太 今田
悠途 寒河江
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日本電信電話株式会社
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Publication date
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Priority to PCT/JP2020/029775 priority Critical patent/WO2022029872A1/fr
Publication of WO2022029872A1 publication Critical patent/WO2022029872A1/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
    • 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
    • G02B6/032—Optical fibres with cladding with or without a coating with non solid core or cladding

Definitions

  • This disclosure relates to optical fibers and optical fiber transmission systems.
  • GAWBS Guided acoustic-wave Brillouin scattering
  • Non-Patent Documents 1 and 2 show that noise due to GAWBS can be reduced by an optical fiber having a plurality of pore structures uniform in the longitudinal direction.
  • An optical fiber having a pore structure has a problem that the manufacturing process is complicated and it is difficult to stably manufacture a long fiber, for example, a plurality of holes are formed in the optical fiber manufacturing process and precise control is required. Has.
  • the optical fiber of the present disclosure is An optical fiber having a clad and a core having a higher refractive index than the clad. At least one of the core or the clad is provided with one or more cavities located at positions other than the center of the core.
  • the optical fiber transmission system of the present disclosure is A transmitter that transmits optical signals and The optical fiber according to the present disclosure, which propagates an optical signal transmitted from the transmission unit, and A receiving unit that receives an optical signal propagated by the optical fiber, To prepare for.
  • An example of the structure of the optical fiber according to the present disclosure is shown.
  • An example of the AA'cross section is shown. It is a distribution of acoustic modes (TR 2, 7 modes) that induce GAWBS . It is an example of the scattering spectrum of GAWBS in a general-purpose single-mode optical fiber.
  • An example of the radial intensity of the acoustic mode is shown.
  • An example of the relationship between the power attenuation of the acoustic wave due to the cavity is shown.
  • An example of the system configuration of the present disclosure is shown.
  • the present disclosure is an optical fiber having a clad region and a core region having a higher refractive index than the clad region, and is discrete in one or in the longitudinal direction in either or both of the clad region and / or the core region of the optical fiber. It is characterized by having a hollow portion that is specifically arranged.
  • FIG. 1 shows a structural example of the optical fiber according to the present disclosure.
  • one or both of the regions of the clad 12 of the optical fiber and / or the region of the core 11 are provided with cavities 13 discretely arranged in the longitudinal direction.
  • the cavity portion 13 is arranged at a non-center position, that is, a position other than the center of the core 11.
  • FIG. 3 shows the distribution of acoustic modes (TR 2, 7 modes) that induce GAWBS .
  • TR 2, 7 modes acoustic modes
  • the acoustic wave spreads and is distributed throughout the clad, and the interaction with the light wave produces GAWBS. Therefore, in the present disclosure, the cavity portion 13 is arranged at a non-centered position in the optical fiber. As a result, the generated acoustic wave is lost and attenuated due to the presence of the cavity portion 13, and as a result, the GAWBS is reduced with respect to the propagated light.
  • one cavity 13 is arranged in the cross section, but it is preferable to arrange two or more of them because the acoustic wave can be more attenuated. Further, the cavity portion 13 can be arranged in the optical fiber at an arbitrary position and size by a processing technique such as laser processing using a femtosecond laser.
  • FIG. 4 is an example of the scattering spectrum of GAWBS in a general-purpose single-mode optical fiber.
  • a general-purpose optical fiber has multiple peaks discretely in a frequency band of 1 GHz or less, and particularly large scattering may occur in TR 2, 5 , TR 2, 7 , and TR 2, 13 modes of acoustic mode. I understand.
  • FIG. 5 shows an example of the radial intensity of the acoustic mode.
  • the horizontal axis is the normalized position r / D in which the center position r of the cavity 13 is standardized by the clad diameter D, and the vertical axis is the normalized acoustic wave intensity compared with the intensity of the acoustic wave when the cavity 13 is not present.
  • the center position r is the distance from the center of the core 11 to the center of the cavity 13.
  • the solid line, broken line, and dotted line represent TR 2, 5 , TR 2, 7 , and TR 2, 13 modes, respectively.
  • the normalized position r / D is small, that is, a relatively large intensity is generated at a position near the center, and this produces a large GAWBS by the interaction with the light wave.
  • the standardized position r / D has the highest strength at 0.02 to 0.12.
  • the cavity portion 13 is arranged at the normalized position r / D where the normalized acoustic wave intensity becomes large.
  • the normalized position r / D at which the standardized acoustic wave intensity is maximized, and the normalized position r / D where a plurality of acoustic modes overlap.
  • the present disclosure can efficiently attenuate the acoustic wave and reduce the GAWBS.
  • FIG. 6 shows an example of the relationship between the amount of power attenuation of the acoustic wave due to the cavity 13.
  • the horizontal axis is the normalized cavity diameter in which the diameter of the cavity 13 is standardized by the clad diameter, and the vertical axis is the reduction rate of the acoustic power as compared with the case where the cavity 13 is not present.
  • the acoustic mode was set to TR 2, 7 mode, which shows a large peak of GAWBS .
  • the cavity 13 is enlarged to receive and attenuate the loss, and a reduction effect of 10% or more can be obtained when the diameter of the normalized cavity is 0.07 or more. It is preferable to adopt a plurality of discrete arrangements in the longitudinal direction of the optical fiber or a plurality of arrangements in the cross section because a higher suppression effect can be obtained.
  • FIG. 7 shows an example of the optical fiber transmission system according to the present disclosure.
  • the transmission unit 91 and the reception unit 92 are connected by an optical fiber transmission line 93.
  • the optical fiber transmission line 93 of the present disclosure includes the optical fiber of the present disclosure at least in part.
  • the transmission unit 91 transmits an optical signal.
  • the optical fiber transmission line 93 propagates the optical signal transmitted from the transmission unit 91.
  • the receiving unit 92 receives the optical signal propagated in the optical fiber transmission line 93.
  • the optical signal can be, for example, an optical signal such as quantum communication or multi-level intensity / phase modulation (QAM: Quadrature Amplitude Modulation) that is greatly affected by GAWBS.
  • QAM Quadrature Amplitude Modulation
  • the optical fiber of the present disclosure can attenuate the acoustic wave generated in the optical fiber. Therefore, the noise power of the GAWBS generated in the optical fiber transmission line 93 is smaller than the noise power of the GAWBS generated by the same transmission power in the general-purpose single-mode fiber. Therefore, the optical fiber transmission system of the present disclosure can reduce the noise generated by GAWBS. For example, when the transmitting unit 91 and the receiving unit 92 transmit and receive optical signals using quantum communication or multi-valued intensity / phase modulation, the influence of GAWBS becomes large, so that the effects of the present disclosure can be further exerted.
  • the acoustic wave generated in the optical fiber is easily attenuated, and GAWBS is used. It is possible to reduce the noise caused by the noise.
  • This disclosure can be applied to the information and communication industry.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

L'objectif de la présente divulgation est de permettre d'atténuer facilement des ondes acoustiques générées dans une fibre optique et de réduire le bruit généré par la diffusion Brillouin par ondes acoustiques guidées.　La présente divulgation concerne une fibre optique qui comprend une gaine et un cœur pour lequel l'indice de réfraction est supérieur à la gaine, le coeur et/ou la gaine étant pourvu d'au moins une section de cavité disposée dans une position autre que le centre du coeur.
PCT/JP2020/029775 2020-08-04 2020-08-04 Fibre optique et système de transmission à fibre optique WO2022029872A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/029775 WO2022029872A1 (fr) 2020-08-04 2020-08-04 Fibre optique et système de transmission à fibre optique

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Application Number Priority Date Filing Date Title
PCT/JP2020/029775 WO2022029872A1 (fr) 2020-08-04 2020-08-04 Fibre optique et système de transmission à fibre optique

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WO2022029872A1 true WO2022029872A1 (fr) 2022-02-10

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04367539A (ja) * 1991-06-11 1992-12-18 Fujikura Ltd 光ファイバ
US5627921A (en) * 1993-10-14 1997-05-06 Telefonaktiebolaget Lm Ericsson Optical fiber for sensors including holes in cladding
JPH10142433A (ja) * 1996-11-12 1998-05-29 Furukawa Electric Co Ltd:The 通信用光ファイバおよびその製造方法
JP2006285234A (ja) * 2005-03-22 2006-10-19 Matsushita Electric Ind Co Ltd 超高速レーザ直接書込加工された一体型回折素子を備えたマルチコア光ファイバ
US20070230861A1 (en) * 2004-05-14 2007-10-04 Igor Khrushchev Laser Inscribed Structures
JP2007532958A (ja) * 2004-04-16 2007-11-15 ディ．ケイ． アンド イー．エル． マクフェイル エンタープライジーズ プロプライエタリー リミテッド 空洞構造を備えた光学的活性基材
JP2014115328A (ja) * 2012-12-06 2014-06-26 Hitachi Metals Ltd ファイバブラッググレーティング及びその製造方法
JP2016537659A (ja) * 2013-01-29 2016-12-01 オーエフエス ファイテル，エルエルシー ホログラムを組み込まれた光導波路
JP2019531487A (ja) * 2016-08-10 2019-10-31 フラウンホファー ゲセルシャフト ツール フェールデルンク ダー アンゲヴァンテン フォルシュンク エー．ファオ． 光学導波路の屈曲及び／またはひずみを決定するための方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04367539A (ja) * 1991-06-11 1992-12-18 Fujikura Ltd 光ファイバ
US5627921A (en) * 1993-10-14 1997-05-06 Telefonaktiebolaget Lm Ericsson Optical fiber for sensors including holes in cladding
JPH10142433A (ja) * 1996-11-12 1998-05-29 Furukawa Electric Co Ltd:The 通信用光ファイバおよびその製造方法
JP2007532958A (ja) * 2004-04-16 2007-11-15 ディ．ケイ． アンド イー．エル． マクフェイル エンタープライジーズ プロプライエタリー リミテッド 空洞構造を備えた光学的活性基材
US20070230861A1 (en) * 2004-05-14 2007-10-04 Igor Khrushchev Laser Inscribed Structures
JP2006285234A (ja) * 2005-03-22 2006-10-19 Matsushita Electric Ind Co Ltd 超高速レーザ直接書込加工された一体型回折素子を備えたマルチコア光ファイバ
JP2014115328A (ja) * 2012-12-06 2014-06-26 Hitachi Metals Ltd ファイバブラッググレーティング及びその製造方法
JP2016537659A (ja) * 2013-01-29 2016-12-01 オーエフエス ファイテル，エルエルシー ホログラムを組み込まれた光導波路
JP2019531487A (ja) * 2016-08-10 2019-10-31 フラウンホファー ゲセルシャフト ツール フェールデルンク ダー アンゲヴァンテン フォルシュンク エー．ファオ． 光学導波路の屈曲及び／またはひずみを決定するための方法

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