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The spot-size contraction technology for single-mode fibers and its applicaions

Research Project

Project/Area Number 09450148
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 情報通信工学
Research InstitutionUtsunomiya University

Principal Investigator

SHIRAISHI Kazuo  Faculty of Engineering, Professor, 工学部, 教授 (90134056)

Co-Investigator(Kenkyū-buntansha) MATSUMURA Kazuhito  Utsunomiya University, Faculty of Eng., Professor, 工学部, 教授 (70005297)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1998: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1997: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsOpfical communication / Optical fiber / spot size / single-mode fiber / splicing / dispersion-compensated fiber / splice loss / mode
Research Abstract

The research has successfully finished. We find and experimentally verified an effective method to reduce modal-field diameter in single-mode fibers. The method utilizes a quarter-pitch length of a parabolic-index fiber having a high focusing parameter. We had experimentally confirmed that modal-field diameter of a standard single-mode fiber at the wavelength 1.55 mum has been reduced from 10.4 mum to 5.8 mum by use of the tip. As the result, we could reduced splicing losses between the standard single-mode fiber and a dispersion-compensated fiber that has a small spot diameter. The direct splicing loss, 2.3 dB, has been reduced to be 0.3 dB by making use of the tip.
In the research, we also developed a technique to cleave graded-index fibers with a precise length. We combined a set of micro positioners and amicroscope with a commercially-available fiber cleaver, As the result, the error in length has becomes less than 10 mum. A modified method utilizing two graded-index fibers having different focusing parameters was also proposed. The cascade configuration offers us variation of reduction ratios by combining two kinds of graded-index-fiber chips.
Technologies developed in the research promise low-loss coupling between standard single-mode fibers and various waveguides, such as dispersion compensated fibers, erbium-doped fibers, and planar waveguides.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] K.Shiraishi: "A lensed-fiber coupling scheme utilizing a graded-index fiber and a hemispherically-ended coreless fiber tip" IEEE/OSA Journal of Lightwave Technology. 15. 356-363 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Laminated polarizers exhibiting high performance over a wide range of wavelength" IEEE/OSA Journal of Lightwave Technology. 15. 1042-1050 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Muro: "Poly-Si/SiO2 laminated walk-off polarizer having a beam-splitting angle of more than 20°" IEEE/OSA Journal of Lightwave Technology. 16. 127-133 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Spatial walk-off polarizing films exhibiting large split angles fabricated by oblique silicon deposition" Optics Letters. 23. 1232-1234 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Spot-size contraction in standard single-mode fibers by use of a GI-fiber tip with a high focusing parameter" IEEE Photonics Technology Letters. 10. 1757-1759 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Spot size reducer for standard single-mode fibers utilizing a graded-index fiber tip" IOOC-ECOC, Edinburgh. paper MO2C (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "A lensed fiber with cascaded GI-fiber configuration for efficient coupling between LDs to single-mode fibers" ECOC, Madrid. Paper TuD17 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Modal-field transformation by use of a graded-index fiber with an elliptic core" IEEE/LEOS, Workshop on Fiber Optic Passive Components Pavia. 157-160 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "A lensed-fiber coupling scheme utilizing a graded-index fiber and a hemisherically-ended coreless fiber tip" IEEE/OSA Journal of Lightwave Technology. vol.15, no.2. 356-363 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Laminated polarizers exhibiting high performance over a wide range of wavelength" IEEE/OSA Journal of Lightwave Technology. vol.15, no.6. 1042-1050 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Muro: "Poly-Si/SiO2 laminated walk-off polarizer having a beam-splitting angle of more than 20゚" IEEE/OSA Journal of Lightwave Technology. vol.16, no.1. 127-133 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Spatial walk-off polarizing films exhibiting large split angles fabricated by oblique silicon deposition" Optics Letters. vol.23, no.15. 1232-1234 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Spot-size contraction in standard single-mode fibers by use of a GI-fiber tip with a high focusing parameter" IEEE Photon.Tech.Lett.vol.10, no.12. 1757-1759 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Spot size reducer for standard single-mode fibers utilizing a graded-index fiber tip" IOOC-ECOC,Edinburgh, September 1997, paper MO2C.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "A lensed fiber with cascaded GI-fiber configuration for efficient coupling between LDs to single-mode fibers" ECOC,Madrid, September 1998, paper TuD17.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Shiraishi: "Modal-field transformation by use of a graded-index fiber with an elliptic core" IEEE/LEOS, Workshop on Fiber Optic Passive Components, Pavia, Italy. 157-160 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Muro: "Poly-Si/SiO2 laminated walk-off polarizer having a beam-splitting angle of more than 20°" IEEE/OSA Journal of Lightwave Technology. 16・1. 127-133 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Shiraishi: "Spatial walk-off polarizing films exhibiting large split angles fabricated by oblique silicon deposition" Optics Letters. 23・15. 1232-1234 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Shiraishi: "Spot-size contraction in standard single-mode fibers by use of a GI-fiber tip with a high focusing parameter" IEEE Photonics Technology Letters. 10・12. 1757-1759 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Shiraishi: "A lensed fiber with cascaded GI-fiber configuration for efficient coupling between LDs to single-mode fibers" European Conference on Optical Communication,Madrid. 355-356 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Shiraishi: "Modal-field transformation by use of a graded-index fiber with an elliptic core" IEEE/LEOS,Workshop on Fiber Optic Passive Components Pavia. 157-160 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Shiraishi: "Laminated polarizers exhibiting high performance over a wide range of wavelength" Journal of Lightwave Technology. 15・6. 1042-1050 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Shiraishi: "Spot size reducer for standard single-mode fibers utilizing a qraded-index fiber tip" 11th IOOC & 23rd ECOC(International Conference). 50-53 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Shiraishi: "Poly-Si/SiO_2 laminated walk-off polarizer having a beam-splitting angle of more than 20°" Journal of Lightwave Technology. 16・1. 127-133 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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