• 제목/요약/키워드: Erbium-doped fiber

검색결과 140건 처리시간 0.023초

평균 밀도 반전 원리를 이용한 WDM용 EDFA의 설계 방법 및 특성 (Design of flat gain EDFAs based on inversion principle and their characteristics)

  • 정희상;최현범;이문섭;이동한;최봉수;문형명;이규행;안성준;장문종
    • 한국광학회지
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    • 제10권5호
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    • pp.401-404
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    • 1999
  • 정확하게 EDF의 발광계수를 측정하는 방법을 개발하고 설계 제작된 광증폭기의 평탄한 이득 상태에서의 특성을 살펴보았다. 간단한 측정읕 통해 원하는 증폭 이득에서 이득이 평탄한 EDFA를 간편하게 설계할 수 있는 방법을 제시하였다.

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GC-EDFA for a Burst Packet Mode Optical Switching System

  • Yang, Choong-Reol;Kim, Whan-Woo
    • Journal of the Optical Society of Korea
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    • 제11권1호
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    • pp.44-48
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    • 2007
  • A two-stage gain-clamped erbium doped fiber amplifier (GC-EDFA) using a pump laser diode and a 16 channel wavelength division multiplexing (WDM) with 0.8 nm spacing in C band of $1,545{\sim}1,560nm$ wavelength is experimentally demonstrated for a burst packet mode optical switching system.

WDM 광패킷스위칭 시스템을 위한 이득 제어 어븀첨가 광섬유증폭기 (A Gain-Clamped Erbium-Doped Fiber Amplifier (GC-EDFA) for WDM Optical Packet Switching System)

  • 양충열;황현용;홍현하;김해근;김환우
    • 한국통신학회논문지
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    • 제26권9B호
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    • pp.1203-1208
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    • 2001
  • 1545∼1560nm 파장의 C 대역에서 0.8nm 간격의 16 채널 WDM을 갖는 펌프 LD 타입의 2단 이득 제어 어븀 첨가 광섬유증폭기(GC-EDFA)를 버스트 패킷 모드 광스위칭 시스템에 사용하기 위하여 실험을 통해 입증하였다.

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어븀이 도핑된 광섬유 링 레이저에서 브릴루엥 폄프 신호와 브릴루엥 스토크스의 동시 발생 (Simultaneous Generation of Brillouin Pump and its Brillouin Stokes in Erbium-Doped Fiber Ring Laser)

  • 박갑동;박재형;이재형;장준성
    • 한국광학회:학술대회논문집
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    • 한국광학회 2000년도 하계학술발표회
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    • pp.142-143
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    • 2000
  • 파장분할 다중화 방식(WDM)이 광통신 시스템의 통신 속도를 획기적으로 향상시키는 방법으로 자리잡음에 따라 다파장 발생에 관한 많은 연구가 이어지고 있다. 지금까지의 연구 결과들은 크게 두가지로 나눌 수 있는 데, 넓은 대역의 이득 매질에서 다양한 방식의 파장선택 특성들을 이용하여 여러 개의 파장을 원하는 간격으로 발생시키는 방법$^{(1).(2)}$ 과 하나의 외부레이저 신호입사에 의한 유도산란을 통하여 일정한 파장간격을 가진 연속차수의 스토크스 신호를 발생시키는 방법$^{(3).(4).(5)}$ 이 있다. (중략)

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EDF spectral filtering을 이용한 OCT 영상 개선 (OCT Image Enhancement using spectral filtering with Erbium-doped Fiber as an Absorber)

  • 나지훈;최은서;이병하;이창수
    • 한국광학회:학술대회논문집
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    • 한국광학회 2003년도 하계학술발표회
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    • pp.254-255
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    • 2003
  • OCT (Optical Coherence Tomography)는 여러 단층영상 촬영기법의 하나로써 절개 없이도 생체의 복잡한 내부구조를 고분해능으로 이미징할 수 있는 장점을 갖고 있다. 고분해능 OCT 이미지는 사용되는 광원에 의해서 결정되는데 가우시안 형태를 갖는 넓은 파장대역의 광원일수록 높은 분해능이 가능하게 된다. OCT에서 사용되는 광원의 종류는 SLD, EELED, ASE등이 사용되고 있다. 그 중에서 ASE광원은 높은 출력 파워를 갖고 넓은 파장대역을 포함하지만 스펙트럼의 형태가 가우시안이 아닌 단점을 가지고 있다. (중략)

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Performance Comparison Between Harmonically Mode-Locked Ring and Figure-of-Eight Type Fiber Lasers

  • Kim Kyong Hon;Lee Hak Kyu;Min-Yong Jeon;El-Hang Lee;Cheol Soon Song;Ki Un NamKoong
    • 한국광학회지
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    • 제7권4호
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    • pp.386-389
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    • 1996
  • We report on comparative results obtained from harmonically mode-locked laser operations of ring-type and figure-of-eight(F8) type erbium-doped fiber lasers by using a directional-coupler type electro-optic modulator as an active mode-locker. The mode-locked and transform-limited pulses of 10.6 ps width were obtained at harmonics of the fundamental cavity frequency with the F8 type laser while mode-locked laser pulses greater than 15 ps were achieved with the ring type laser.

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Decaying/Expanding Distribution of RDPS in the Half Section of a Dispersion-Managed Optical Link Combined with Mid-Span Spectral Inversion

  • Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • 제17권4호
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    • pp.227-233
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    • 2019
  • In long-haul optical communication system consisting of standard single-mode fiber spans and fiber amplifiers, such as the erbium-doped fiber amplifier, performance is deteriorated by signal distortion due to chromatic dispersion and nonlinearity of the fiber. A combination of dispersion management and optical phase conjugation is an effective technique to compensate for the distortion. In an optical link configured by this combination, a dispersion map mainly affects the compensation of the distorted optical signals. This paper proposes new dispersion maps configured by the decaying or expanding distribution of residual dispersion per span (RDPS) in a dispersion-managed link combined with a midway optical phase conjugator. The effect of the proposed dispersion maps on the compensation for distorted 24 channel × 40 Gbps wavelength-division multiplexed signals was assessed through numerical simulation. It was confirmed that all the proposed dispersion maps are most appropriate for the compensation and, furthermore, for the flexibility of link configuration than conventional links.

L-band Power Enhancement through the reinsertion of backward ASE filtered by a C/L-band coupler

  • Kim Seung Taek;Gang Seong Bok;Jeong Hun;Lee Gyeong Gyun;Gang Hui Seok;Jo Yeong Jun
    • 한국광학회:학술대회논문집
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    • 한국광학회 2003년도 하계학술발표회
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    • pp.20-21
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    • 2003
  • Erbium doped fiber (EDF) sources are useful devices for characterization of optical components for wavelength division multiplexing (WDM) fiber optic communication system. Therefore, there are many efforts to extend the bandwidth and to increase the power of the light source. Especially, L-band ASE source uses the low inversion state of EDF. It makes the power efficiency very low and needs a lot of fiber as several times as the fiber needed in C-band ASE generation. (omitted)

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Er 첨가 황화물계 광섬유의 제조 및 분광학적 특성 (Spectroscopic Properties of Er-doped Sulfide Fiber)

  • 최용규;임동성;김경헌;박세호;허종
    • 한국세라믹학회지
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    • 제37권8호
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    • pp.781-786
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    • 2000
  • An Er-doped sulfide fiber was drawn, and its spectroscopic properties were analyzed. Compositions of a 1000 ppmwt Er3+-doped core and an undoped clad were Ge30-Ga1-Asg-S61 and Ge30-As8-S62, in at.%, respectively. Refractive index of the core composition was approximately 0.01 high than that of the clad. In order to enhance the mechanical stability as well as to prevent infiltration of impurity ions such as OH-, an UV-curable polymer was used for the coating. The optical loss of a fiber formed directly from a polymer coated core rod without cladding was ∼15 dB/m at 1.06$\mu\textrm{m}$. In the case of a fiber with core/clad structure, the optical loss was so high that the stimulated emission of erbium fluorescence was not evident. It is believed that presence of inhomogeneous core/clad interface and crystalline aggregates precipitated in the clad region were responsible for the high optical loss. On the other hand, fluorescence characteristics of Er3+ embedded in the core region were more or loss deteriorate compared to fiber preform, which is attributed to the redistribution of the Er ions along with the partial crystallization of the core glass during the fiberization process.

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