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1996 Fiscal Year Final Research Report Summary

Improvement of functions in synthesis and scan of the optical co-herence function and its applications to distributed photonic sensing

Research Project

Project/Area Number 07455166
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 計測・制御工学
Research InstitutionThe University of Tokyo

Principal Investigator

HOTATE Kazuo  The University of Tokyo Research Center for Advanced Science and Technology Professor, 先端科学技術研究センター, 教授 (60126159)

Project Period (FY) 1995 – 1996
KeywordsREFRECTOMETRY / COHERENCE FUNCTION / FREQUENCY SCANNING / COHERENT PHOTONIC SENSING / DIAGNOSIS OF LIGHTWAVE NETWORKS / DISTRIBUTED PHOTONIC SENSING
Research Abstract

The author has invented a technique, in which optical coherence function can be synthesised in arbitrary shapes. Moreover, additional technique has also been invented to scan the function by using a phase modulation on the reference lightwave in the interferometer. In this research project, this principle is applied to construct new distributed sensing systems.
At first, phase-modulationg Optical Coherence Domain Refrectomatry by Synthesis of CO-herence Function, p-OCDR for short, has been proposed. In the previous OCDR method, not only synthesising but also scanning the coherence function was carried out by the lasing frequency modulation of a semiconductor lase. On the contrary, in p-OCDR the scanning is done by the phase modulation, which results in increasing the accuracy of the synthesised shape. Deterioration factors in p-OCDR were considred to found the countermeasures, then 1.2mm resolution and -100 dB sensitivity have been realized. To diagnose divices at the end of optical sub … More scriber networks in the Fiber TO The Home system, new reflectometry with high spatial resolution and long range has also been proposed. Reflectivity distribution at about 5Km far end has successfully been measured with 6cm resolution. Next, p-OCDR has been applied to measure mode coupling distribution between two polalization eigen modes in a polalization maintaining fiber, which provide a distributed pressure sensing system. An experimental system has been constructed, which has shown the resolution of 9m and the measurable range of 1Km.
We have also studied a method to mauti/demultiplex sensor outputs from fiber interfero-metric sensors. Phase information from one sensor has successfully been selected from others by using Synthesis of the Coherence Function Technique. Moreover, an optical tomography system has also been proposed utilising the thechnique, in which no mechanical moving part any calculation are needed.
As described above, enough research results have been accululated on this research project. Less

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] T.Okugawa and K.Hotate: "Optical information processing by synthesis of the coherence function -Photonic/video hybrid system-" IEICE Transactions on Electronics. E78-C. 1286-1291 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Okugawa and K.Hotate: "Real-time optical image processing by synthesis of the Coherence function using real-time holography" IEEE Photonics Technology Letters. 8. 257-259 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Okugawa and K.Hotate: "Synthesis of Arbitrary shapes of optical coherence function using phase modulation" IEEE Photonics Technology Letters. 8. 1710-1712 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Saida and K.Hotate: "Distributed fiber-optic stress sensor by synthesis of the optical coherence function" IEEE Photonics Technology Letters. 9(in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z.-Y.He,N.Mukohzaka and K.Hotate: "Selective image extraction by synthesis of the coherence function using two-dimensional optical lock-in amplifier with microchannel spatial light modulator" IEEE Photonics Technology Letters. 9(in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hotate,T.Okugawa and T.Saida: "Applications of synthesis of the optical coherence function : 1-dimensional reflectometry and 3-dimensional optical image processing 〈Invited〉" EOS/SPIE Distributed and Multiplexed Fiber Optic Sensors V. 2507. 66-77 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hotate: "Selective image retrieval by synthesis of coherence functition, "Ultrafast and Ultra-Parallel Optoelectronics." 11.2" Ohm-sha, 561-569 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Okugawa and K.Hotate: "Optical information processing by synthesis of the coherence function - Photonic/video hybrid system -" IEICE Transactions on Electronics. Vol.E78-C,No.9. 1286-1291 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Okugawa and K.Hotate: "Real-time optical image processing by synthesis of the Coherence function using real-time holography" IEEE Photonics Technology Letters. Vol.8, No.2. 257-259 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Okugawa and K.Hotate: "Synthesis of Arbitrary shapes of optical coherence function using phase modulation" IEEE Photonics Technology Letters. Vol.8, No.12. 1710-1712 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Saida and K.Hotate: "Distributed fiber-optic stress sensor by synthesis of the optical coherence function" IEEE Photonics Technology Letters. Vol.9, No.4, (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Z.-Y.He, N.Mukohzaka and K.Hotate: "Selective image extraction by synthesis of the coherence function using two-dimenstional optical lock-in amplifier with microchammel spatial light modulator" IEEE Photonics Technology Letters. Vol.9, No.4, (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hotate, T.okugawa and T.Saida: "Applications of synthesis of the optical coherence function : 1-dimensional reflectometry and 3-dimensional optical image processing <Invited>" EOS/SPIE Distributed and Multiplexed FIber Optic Sensors V. Vol.2507. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hotate, T.okugawa and T.Saida: "Applications of synthesis of the optical coherence function : 1-dimensional reflectometry and 3-dimensional optical image processing <Invited>" EOS/SPIE Distributed and Multiplexed FIber Optic Sensors V. Vol.2507. (1995)66-77

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hotate: Selective image retrieval by synthesis of coherence function, "Ultrafast and Ultra-Parallel Optoelectronics, " 11.2. Ohm-sha, 561-569 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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