• Title/Summary/Keyword: photonic crystal fiber

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Design of a Polarization Splitter Based on a Dual-core Hexagonal-shaped Photonic Crystal Fiber

  • Jegadeesan, Subramani;Dhamodaran, Muneeswaran;Azees, Maria;Murugan, Arunachalam
    • Current Optics and Photonics
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    • v.3 no.4
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    • pp.304-310
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    • 2019
  • In this paper, a microstructured, hexagonal-shaped dual-core photonic crystal fiber (PCF) is proposed. The proposed structure has specific optical properties to obtain high birefringence and short coupling length, for different values of structural parameters varied over a wide range of wavelength. The properties are analyzed using a solid core of silica material. The proposed structure is implemented as a polarization splitter with splitting length of 1.9 mm and a splitting ratio of -34.988 dB, at a wavelength of 1550 nm. The obtained bandwidth in one band gap of about 81 nm. The numerical analysis ensures that the performance of the proposed polarization splitter is better than that of existing ones.

The Effect of Microbending on Photonic Crystal Fiber (광자결정 광섬유의 마이크로벤eld 영향)

  • 문대승;김진채;엄주범;백운출;이병하
    • Proceedings of the Optical Society of Korea Conference
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    • 2002.07a
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    • pp.168-169
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    • 2002
  • 일반적인 광섬유가 실리카로 만들어진 클래딩과 이보다 약간 굴절률이 높은 코어로 구성되어 있는 것과는 달리 광자결정 광섬유(photonic crystal fiber 또는 다공성 광섬유(holey fiber))는 코아와 클래딩이 순수 실리카로 구성되어 있다 클래딩의 효과를 주기 위해 광섬유 축을 따라서 규칙적인 공기구멍 다발을 형성하여 준다. 광자결정 광섬유는 특이한 광학적 특성 때문에 최근에 활발히 연구되어 지고 있다. 공기구멍의 구조를 조절함으로써 넓은 파장 영역에서 단일 모드로 진행하고(1), 아주 큰 분산을 갖게 할 수 lT고, hem 반경을 조절 할 수 있으며, 특이한 분산 특성과 이의 조절이 가능하다. (중략)

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Widely-Tunable Single-Notch Acousto-optic Filter using Two-mode Photonic Crystal Fiber (광자결정 이중모드 광섬유의 음향광학 필터 특성 연구)

  • Hong, Gi-Seok;Park, Hyeon-Cheol;Hwang, In-Gak;;;Yeom, Dong-Il;Kim, Byeong-Yun
    • Proceedings of the Optical Society of Korea Conference
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    • 2008.07a
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    • pp.139-140
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    • 2008
  • We demonstrate a novel acousto-optic filter using a two-mode photonic crystal fiber. Thanks to endless two-mode operation of the fiber, single notch over a whole spectrum is obtained with tuning range of> 1000 nm.

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Highly-Dispersive Guided Modes of Two-Dimensional Photonic Crystal Waveguides

  • Kim, Guk-Hyun;Lee, Yong-Hee
    • Journal of the Optical Society of Korea
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    • v.7 no.1
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    • pp.38-41
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    • 2003
  • We present an analysis of highly-dispersive guided modes of two-dimensional photonic crystal waveguides. By the plane ave expansion method, band structures and mode profiles of two-dimensional photonic crystal waveguides are obtained. It is found that guided modes have very small group velocities and very large group velocity dispersions in the region near the f-point and in the region near the Brillouin zone edge. Especially, the group velocity dispersions are found to be millions of times larger than that of a conventional optical fiber. The contributions of the transverse resonance formed by two photonic band gap reflectors and the standing wave mode formed by periodic structures are discussed. We conclude that the highly-dispersive characteristics originate from the resonator-like aspect of the photonic crystal waveguide.

Low Loss Fusion Splicing of Photonic Crystal Fiber and Single-Mode Fiber (광자결정 광섬유와 단일모드 광섬유 저손실 융착접속)

  • Ahn, Jin-Soo;Park, Kwang-No;Kim, Gil-Hwan;Lee, Sang-Bae;Lee, Kyung-Shik
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.46 no.7
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    • pp.15-21
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    • 2009
  • We proposed a fusion splicing method for low splicing loss between a single-mode fiber(SMF) and two different photonic crystal fibers(PCFs) such as a photonic bandgap fiber(PBGF) and highly nonlinear photonic crystal fiber(NL-PCF). The splicing loss between the SMF and PBGF is affected by air-hole collapse. Therefore, we optimized fusion splicer and reduced a splicing loss below 1.22 dB. We also inserted a Intra High Numerical Aperture(UHNA) fiber between the SMF and NL-PCF to achieve a splicing loss of below 2.59 dB.

Characterization of Supercontinuum Generation as a function of Pump Wavelength and Intensity in Photonic Crystal Fiber (광자 결정 광섬유에서 펌프광원의 파장과 입력파워에 따른 초 광대역 광원 발생의 특성)

  • Kim, Jong-Doo;Yee, Ki-Ju;Jeon, Min-Yong;Ahn, Seong-Joon;Choi, Yong-Gyu
    • Korean Journal of Optics and Photonics
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    • v.16 no.6
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    • pp.490-493
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    • 2005
  • We have experimentally studied supercontinuum generation in a photonic crystal fiber as a function of pump wavelength and intensity with 100 fs pulsewidth. A supercontinuum over 750 nm spectral width with amplitude variation less than 10 dB has been achieved. It was generated by coupling femtosecond pulses from a mode-locked Ti:Sapphire laser into a 2 m long photonic crystal fiber. Adjusting the parameters of the pump source, it was also possible to control different spectral features of the supercontinuum radiation.

Highly Birefringent and Dispersion Compensating Photonic Crystal Fiber Based on Double Line Defect Core

  • Lee, Yong Soo;Lee, Chung Ghiu;Jung, Yongmin;Oh, Myoung-kyu;Kim, Soeun
    • Journal of the Optical Society of Korea
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    • v.20 no.5
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    • pp.567-574
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    • 2016
  • We propose a highly birefringent and dispersion compensating photonic crystal fiber based on a double line defect core. Using a finite element method (FEM) with a perfectly matched layer (PML), it is demonstrated that it is possible to obtain broadband large negative dispersion of about -400 to -427 ps/(nm.km) covering all optical communication bands (from O to U band) and to achieve the dispersion coefficient of -425 ps/(nm.km) at 1.55μm. In addition, the highest birefringence of the proposed PCF at 1.55 μm is 1.92 × 10-2 and the value of birefringence from the wavelength of 1.26 to 1.8 μm (covering O to U bands) is about 1.8 × 10-2 to 1.92 × 10-2. It is confirmed that from the simulation results, the confinement loss of the proposed PCF is always less than 10-3 dB/km at 1.55 μm with seven fiber rings of air holes in the cladding.

Birefringence induced by irregular structure of photonic crystal fibers (광결정 광섬유의 불규칙적인 구조로 인한 복굴절)

  • Hwang, In-Gak;Lee, Yong-Jae;Lee, Yong-Hui
    • Proceedings of the Optical Society of Korea Conference
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    • 2004.02a
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    • pp.368-369
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    • 2004
  • Birefringence due to structural irregularities in photonic crystal fiber is numerically analyzed. The statistical correlations between the birefringence and the degree of the irregularities are presented, and their behaviors are explained using a perturbation theory.

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Study on the Novel Fabrication Method of Highly Birefringent Photonic Crystal Fiber (새로운 구조의 큰 복 굴절을 가진 광자결정 광섬유의 제작에 관한 연구)

  • Ma, Kyung-Sik;Kim, Gil-Hwan;Hwang, Kyu-Jin;Eom, Sung-Hoon;Lee, Kwan-Il;Jung, Je-Myung;Lee, Sang-Bae
    • Korean Journal of Optics and Photonics
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    • v.21 no.6
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    • pp.235-240
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    • 2010
  • We fabricate highly birefringent photonic crystal fiber with new structure using a stack and draw method. Fabricated fiber has two big air holes, one at each side of the outside air cladding region, leading to core ellipticity during the drawing process. Birefringence of the fabricated Hi-Bi PCF is measured to be $2.29{\times}10^{-4}$ (at 1550 nm).

Fabrication of Artificial Crystal Architectures by Micro-manipulation of Spherical Particles

  • Takagi, Kenta;Kawasaki, Akira;Watanabe, Ryuzo
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.910-911
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    • 2006
  • We newly designed and manufactured a new arranging system for a three-dimensional artificial crystal of monosized micro particles. In this system, a robotic micro-manipulator accurately locates the spherical particle onto the lattice point, and subsequently fiber lasers micro-weld the contact points between the neighboring particles. Actually, one- and two-dimensional arrays were constructed using monosized tin particles with the diameter of 400 m. Moreover, due to optimization of the process parameters, we successfully constructed the artificial crystals of simple cubic and diamond structures. In particular, the diamond structure which can represent a large photonic band gap is expected to progress toward a practical photonic crystal device.

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