• 제목/요약/키워드: Optical Fibers

검색결과 535건 처리시간 0.03초

Transmission and Sensing Characteristics of the Biconically Tapered Cladded Multimode Fibers

  • Kim, Kwang-Taek;Hong, Ki-Bum;Park, Jae-Hee
    • Journal of the Optical Society of Korea
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    • 제13권2호
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    • pp.234-239
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    • 2009
  • This paper presents a theoretical and experimental investigation of the transmission and sensing characteristics of the biconically tapered cladded multimode fibers. The beam propagation method was used to examine the transmission characteristics with various structural parameters. The results show that the transmission of the biconically tapered cladded multimode fibers is sensitive to the mode of the input optical beam and the refractive index of the external medium. A refractive index sensor for the external medium was proposed based on the theoretical analysis, and its feasibility was demonstrated experimentally.

VAD 공법을 이용한 판다형 편광유지광섬유 제조 및 특성평가 (Fabrication and characteristics evaluation of Panda polarization-maintaining fibers by VAD method)

  • 최성순;구석수;정창현;이경구;오치환;유기선;조민식;권오선;최우석;송기원
    • 한국광학회:학술대회논문집
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    • 한국광학회 2008년도 하계학술발표회 논문집
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    • pp.425-426
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    • 2008
  • The Panda-type polarization maintaining fibers were fabricated by VAD(vapor-phase axial deposition) method. We fabricate Panda style polarization maintaining fibers that have small form factor($80{\mu}m$), high H-parameter of about $1{\times}10^{-4}/m$ and low optical loss of about 3dB/km.

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멀티코어 광섬유를 이용한 광에너지 전송에 관한 분석 연구 (Analysis of optical energy delivery through multi-core optical fibers)

  • 김성만
    • 한국전자통신학회논문지
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    • 제7권5호
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    • pp.1079-1085
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    • 2012
  • 현재 전 세계의 많은 과학자들이 지속 가능한 에너지원을 찾기 위하여 많은 노력을 하고 있지만, 태양광에너지가 궁극적인 해답이 될 것으로 받아들여지고 있다. 이러한 광 에너지는 조명용, 발열용, 통신용 등으로 사용될 수 있으며, 심지어 최근에는 광에너지로 동작하는 광자구동 모터에 대한 연구결과도 나오고 있다. 본 논문에서는 이러한 광에너지를 광섬유를 통해 전송할 수 있는 기술에 대해 이론적인 분석을 수행하였다. 특히, 한 가닥의 광섬유에 여러 개의 코어(core)가 삽입된 멀티코어(multi-core) 광섬유를 이용한 광에너지 전송의 에너지 전송량에 대해 예측해 보았다. 본 논문의 분석 결과에 따르면, 한 가닥의 멀티코어 광섬유로 약 2 kW 의 광에너지 전송이 가능할 것으로 예측되었으며, 초고압선처럼 수 cm 의 직경으로 광섬유 다발을 묶을 경우에는 10 MW 이상의 광에너지 전송이 가능할 것으로 예측되었다. 이는 도체 전력선과 비교하여 절반수준의 에너지 전송량으로 충분한 경쟁력이 있을 것으로 생각된다.

Structural Analysis of a Cavitary Region Created by Femtosecond Laser Process

  • Fujii, Takaaki;Goya, Kenji;Watanabe, Kazuhiro
    • 동력기계공학회지
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    • 제19권3호
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    • pp.5-10
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    • 2015
  • Femtosecond laser machining has been applied for creating a sensor function in silica glass optical fibers. Femtosecond laser pulses make it possible to fabricate micro structures in processed regions of a very thin glass fiber line because femtosecond laser pulses can extremely minimize thermal effects. With the laser machining to optical fiber using a single shot of 210-fs laser at a wavelength of 800 nm, it was observed that a processed region surrounded a thin layer which seemed to be a hollow cavity monitored by scanning electron microscopy (SEM). This study aims at a theoretical investigation for the processed region by using a numerical analysis in order to embed sensing function to optical fibers. Numerical methods based finite element method (FEM) has been used for an optical waveguide modeling. This report suggests two types modeling and describes a comparative study on optical losses obtained by the experiment and the numerical analysis.

${\lambda}=1.55{\mu}m$에서 극저분산을 갖는 사중-클래드 평탄분산 광섬유의 설계 (Design of quadruple-clad, dispersion-flattened optical fibers with ultra-low dispersion at ${\lambda}=1.55{\mu}m$)

  • 정석원;김창민
    • 전자공학회논문지A
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    • 제32A권8호
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    • pp.140-152
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    • 1995
  • Derived was the scalar wave equation of optical fibers. Based on the derived equation, the dispersion characteristics of arbitrarily profiled fibers were analyzed. We applied the 1-D FEM employing quadratic interpolation fucntions to solve the scalar wave equation. To find the optimum index distribution of a fiber that has the ultra-low total dispersion, we analyzed QC fibers as objects. Adding 2$_{nd}$ and 3$_{rd}$ clads to DC fiber, we investigated the change of dispersion characteristics. We found the QC fiber parameters for which the dispersion was ultra-low flattened, less than 0.5 ps/km.nm for ${\lambda}=1.4~1.6{\mu}m$, and the dispersion value was as low as 0.20 ps/km.nm at ${\lambda}=1.55{\mu}m$.

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