• 제목/요약/키워드: photonic crystal fiber

검색결과 79건 처리시간 0.026초

The Fabrication of a Photonic Crystal Fiber and Measurement of its Properties

  • Kim, Jin-Chae;Kim, Ho-Kyung;Paek, Un-Chul;Lee, Byeong-Ha;Eom, Joo-Beom
    • Journal of the Optical Society of Korea
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    • 제7권2호
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    • pp.79-83
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    • 2003
  • In this paper, we describe the fabrication process of a photonic crystal fiber and present the measured optical properties of the photonic crystal fiber. The fabrication of the photonic crystal fiber involves stacking, jacketing, collapsing, and drawing using a conventional drawing tower The photonic crystal fiber drawing needs higher tension to maintain the uniform air hole structure. Thus, the temperature of the photonic crystal fiber drawing is lowered by a few hundred degrees Celsius than for the case of conventional optical fiber drawing. The optical properties of the fabricated photonic crystal fiber such as mode profile, optical loss, transmission spectrum, bending loss, and polarization dependent loss are measured.

Single-mode Condition and Dispersion of Terahertz Photonic Crystal Fiber

  • Kim, Soan;Kee, Chul-Sik;Lee, Jong-Min
    • Journal of the Optical Society of Korea
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    • 제11권3호
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    • pp.97-100
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    • 2007
  • We have investigated properties of a plastic photonic crystal fiber guiding terahertz radiations, THz photonic crystal fiber. The single-mode condition and dispersion of a plastic triangular THz photonic crystal fiber are investigated by using the plane wave expansion method and the beam propagation method. The THz photonic crystal fiber can perform as a single-mode fiber below 2.5 THz when the ratio of diameter (d) and period (${\Lambda}$) of air holes is less than 0.475. The THz photonic crystal fiber with ${\Lambda}=500{\mu}m$ and $d/{\Lambda}=0.4$ shows almost zero flattened dispersion behavior, $-0.03{\pm}0.02 ps/THz{\cdot}cm$, in the THz frequency range from 0.8 to 2.0 THz.

Highly Birefringent Slotted-porous-core Photonic Crystal Fiber with Elliptical-hole Cladding for Terahertz Applications

  • Lee, Yong Soo;Kim, Soeun;Oh, Kyunghwan
    • Current Optics and Photonics
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    • 제6권2호
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    • pp.129-136
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    • 2022
  • We propose a photonic crystal fiber (PCF) with a slotted porous core and elliptical-hole cladding, for high birefringence in the terahertz regime. Asymmetry in the guided mode is obtained mainly by using arrays of elliptical air holes in the TOPAS® polymer cladding. We investigate the tradeoff between several structural parameters and find optimized values that can have a high birefringence while satisfying the single-mode condition. The optical properties in the terahertz regime are thoroughly analyzed in numerical simulations, using a full-vector finite-element method with the perfectly-matched-layer condition. In an optimal design, the proposed photonic crystal fiber shows a high birefringence of 8.80 × 10-2 and an effective material loss of 0.07 cm-1 at a frequency of 1 THz, satisfying the single-mode-guidance condition at the same time. The proposed PCF would be useful for various polarization-management applications in the terahertz range.

Photonic Quasi-crystal Fiber for Orbital Angular Momentum Modes with Ultra-flat Dispersion

  • Kim, Myunghwan;Kim, Soeun
    • Current Optics and Photonics
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    • 제3권4호
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    • pp.298-303
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    • 2019
  • We propose a photonic quasi-crystal fiber (PQF) for supporting up to 14 orbital angular momentum (OAM) modes with low and ultra-flat dispersion characteristics over the C+L bands. The designed PQF which consists of a large hollow center and quasi structural small air holes in the clad region exhibits low confinement losses and a large effective index separation (>$10^{-4}$) between the vector modes. This proposed fiber could potentially be exploited for mode division multiplexing and other OAM mode applications in fibers.

Analysis on Transition between Index- and Bandgap-guided Modes in Photonic Crystal Fiber

  • Hong, Kee Suk;Lim, Sun Do;Park, Hee Su;Kim, Seung Kwan
    • Journal of the Optical Society of Korea
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    • 제20권6호
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    • pp.733-738
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    • 2016
  • We calculate optical properties of guided modes of a hybrid-guiding photonic crystal fiber. The design and modeling of such hybrid-guiding PCF is made by replacing air holes with inserts of high refractive index material layer by layer in order. The optical properties such as mode intensity profile, mode dispersion, optical birefringence, confinement loss, and chromatic dispersion during transition of the guiding mechanism are analyzed and discussed. The guided modes in the hybrid-guiding region are also compared with those of reference index-guiding and bandgap-guiding photonic crystal fibers.

저손실 융착접속을 이용한 광자결정 광섬유 간섭계 (Fiber Interferometers Based on Low Loss Fusion Splicing of Photonic Crystal Fibers)

  • 안진수;김길환;이관일;이경식;이상배
    • 한국광학회지
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    • 제21권5호
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    • pp.200-205
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    • 2010
  • 본 논문에서는 포토닉 밴드갭 광섬유(Photonic Bandgap Fiber: PBGF) 사이에 중공광섬유(Hollow Optical Fiber: HOF)를 융착 접속시켜 만든 광섬유 간섭계와 넓은 모드 면적을 가지는 광자결정 광섬유(Large Mode Area-Photonic Crystal Fiber: LMA-PCF)사이에 HOF를 융착접속시켜 만든 광섬유 간섭계의 온도 및 스트레인에 대한 광학적 특성을 분석하였다. PBGF 또는 LMA-PCF와 HOF의 융착접속시 광섬유내 공기구멍을 최대한 유지하도록 융착조건을 최적화하여 접속 손실을 줄였다. PBGF와 HOF로 구성된 광섬유 간섭계의 온도 및 스트레인에 대한 민감도는 각각 15.4 pm/$^{\circ}C$와 0.24 pm/${\mu}\varepsilon$으로 측정되었으며, LMA-PCF와 HOF로 구성된 광섬유 간섭계의 온도 및 스트레인에 대한 민감도는 각각 17.4 pm/$^{\circ}C$와 0.2 pm/${\mu}\varepsilon$으로 측정되었다.

Dispersion and Nonlinear Properties of Elliptical Air Hole Photonic Crystal Fiber

  • Rao, MP Srinivasa;Singh, Vivek
    • Current Optics and Photonics
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    • 제2권6호
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    • pp.525-531
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    • 2018
  • The effect of eccentricity on dispersion and nonlinear properties of a photonic crystal fiber having elliptical air holes is investigated using a fully vectorial effective index method. It is found that the effective refractive index increases with increase of eccentricity. The dependence of dispersion and nonlinear properties of the PCF on the eccentricity of the air hole is investigated. It is revealed that eccentricity of the air hole affects the zero dispersion wavelength. Further, the nonlinear properties such as mode field area, nonlinear coefficient and self phase modulation of the Photonic crystal fibers are analyzed. The mode field area increases and the nonlinear coefficient decreases with increase in eccentricity. The variation of the self phase modulation with elliptical air hole is also discussed.

광결정 광섬유를 이용한 WDM-RoF 시스템의 채널간 전력변화 편차 분석 (Interchannel RF Power Fluctuation in WDM-RoF System Employing Photonic Crystal Fiber)

  • 김소은;이충규
    • 한국정보통신학회논문지
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    • 제16권4호
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    • pp.821-828
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    • 2012
  • 파장분할다중화-무선광통신(WDM-RoF) 시스템에서 광결정 광섬유를 이용하여 채널 간 고주파신호들의 전력변화의 편차를 분석하여 이들을 조절할 수 있음을 확인하였다. WDM-RoF 시스템의 경우, 원격노드에서의 고주파 신호 특성은 파장 의존성을 갖는 단일모드 광섬유의 분산 특성으로 인해 전송거리 증가에 대한 고주파신호 수신 전력 변화가 채널의 파장에 따른 편차를 나타내게 되며, 이는 전체 시스템 설계시 전송거리에 대한 제한 요소로 작용할 수 있다. 광결정 광섬유의 분산보상 특성을 이용하여 WDM 채널에 따른 고주파 전송특성을 개선할 수 있는 광결정 광섬유를 설계하고, 이를 통해 채널간 고주파 전송특성의 편차를 분석하였다.

Analysis of a Photonic Crystal Fiber Sensor with Reuleaux Triangle

  • Bing, Pibin;Huang, Shichao;Guo, Xinyue;Zhang, Hongtao;Tan, Lian;Li, Zhongyang;Yao, Jianquan
    • Current Optics and Photonics
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    • 제3권3호
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    • pp.199-203
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    • 2019
  • The characteristics of a photonic crystal fiber sensor with reuleaux triangle are studied by using the finite element method. The wavelength sensitivity of the designed optical fiber sensor is related to the arc radius of the reuleaux triangle. Whether the core area is solid or liquid as well as the refractive index of the liquid core contributes to wavelength sensitivity. The simulation results show that larger arc radius leads to higher sensitivity. The sensitivity can be improved by introducing a liquid core, and higher wavelength sensitivity can be achieved with a lower refractive index liquid core. In addition, the specific channel plated with gold film is polished and then analyte is deposited on the film surface, in which case the position of the resonance peak is the same as that of the complete photonic crystal fiber with three analyte channels being filled with analyte. This means that filling process becomes convenient with equivalent performance of designed sensor. The maximum wavelength sensitivity of the sensor is 10200 nm/RIU and the resolution is $9.8{\times}10^{-6}RIU$.

광결정 광섬유를 갖는 WDM-ROF 시스템의 고주파 신호전송특성 분석 (Analysis of RF Signal Transmission in WDM-ROF Employging Photonic Crystal Fiber)

  • 김소은;박철수;이충규
    • 한국정보통신학회논문지
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    • 제15권1호
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    • pp.188-194
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    • 2011
  • 광결정 광섬유를 포함한 WDM-ROF (wavelength division multiplexing - radio over fiber) 시스템의 고주파신호 전송특성을 분석하였다. 기존의 단일모드 광섬유를 사용한 WDM-ROF 시스템에 있어, 각 WDM 채널의 파장에 따른 고주파신호 전송특성을 분석하였다. 이 경우, 원격노드(remote node)에서의 고주파 신호 특성은 단일모드 광섬유의 분산 특성으로 인해 각 WDM 채널의 파장에 따라 고주파신호 수신 파워의 편차를 나타내게 되며, 이는 전체 시스템 설계시 제한 요소로 작용하게 된다. 광결정 광섬유를 단일모드 광섬유와 함께 사용함으로써 광결정 광섬유의 분산 보상 특성을 이용하여 WDM 채널에 따른 고주파 전송특성을 개선할 수 있음을 확인하였다.