• 제목/요약/키워드: Erbium-doped fiber

검색결과 140건 처리시간 0.029초

$Er^{3+}$ 첨가 $LiNbO_3$ fiber 단결정의 성장 및 upconversion 특성 (Growth and upconversion properties of erbium doped $LiNbO_3$ single crystal fibers)

  • Yang, Woo-Seok;Suh, Su-Jeong;Lee, Jong-Ho;Tsuguo Fukuda;Yoon, Dae-Ho
    • 한국결정성장학회:학술대회논문집
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    • 한국결정성장학회 1999년도 PROCEEDINGS OF 99 INTERNATIONAL CONFERENCE OF THE KACG AND 6TH KOREA·JAPAN EMG SYMPOSIUM (ELECTRONIC MATERIALS GROWTH SYMPOSIUM), HANYANG UNIVERSITY, SEOUL, 06월 09일 JUNE 1999
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    • pp.321-335
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    • 1999

  • Erbium(Er) doped LiNbO3(Er:LiNbO3) single crystal gibers were grown free of cracks along the c-axis by micro-pulling down method. the Er3+ concentration was distributed homogeneously along the growth axis. The samples for optical characterization were cut from as-grown single crystal fibers and polished. When the 980 nm light was incident on the sample, upconversion phenomena were observed at the green range of wavelength 510~570 nm. In addition, the intensity of upconversion was remarkably increased by increasing the concentration of Er2O3 dopant in as-grown Er:LiNbO3 crystals.

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Performance of Bipolar Optical Spectral Encoding CDMA with Modified PN Codes

  • Chang, Sun-Hyok;Kim, Bong-Kyu;Park, Heuk;Lee, Won-Kyoung;Kim, Kwang-Joon
    • ETRI Journal
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    • 제28권4호
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    • pp.513-516
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    • 2006

  • Experimental demonstration of bipolar spectral encoding code-division multiple-access with modified pseudorandom noise codes is presented. Bipolar spectral encoding is achieved with an erbium-doped fiber amplifier amplified spontaneous emission source and arrayed waveguide gratings. The bit-error rate performance of 1.25 Gbps signal transmission over 80 km single mode fiber is measured in a multiple-user environment.

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편광 유지 광섬유에 새겨진 장주기 격자를 이용한 어븀 첨가 광섬유 레이저의 파장 스위칭 (Wavelength Switching of Erbium-Doped Fiber Laser using Long-Period Fiber Grating Written on a Polarization-Maintaining Fiber)

  • 이용욱;이병호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기물성,응용부문
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    • pp.48-50
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    • 2002

  • 편광 유지 광섬유에 새겨진 장주기 격자의 파장에 따른 편광 의존 손실을 이용하여, 광섬유 브래그 격자가 사용된 광섬유 레이저에서 공동 내부 빛의 편광을 회전시킴에 따라, 발진 파장의 스위칭 및 이중 파장 발진이 가능함을 보였다.

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광상호분배기 실험 모델 (An experimental optical cross-connect)

  • 이성은;윤병호방준학서완식
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 1998년도 추계종합학술대회 논문집
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    • pp.995-997
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    • 1998

  • The experimental optical cross-connect based on delivery and coupling switch features all-optical property. It consists of erbium-doped fiber amplifiers, arrayedwaveguide gratings, optical switches and optical combiners. In 4 channel wavelength division multiplexing with 1.6 nm spacing, the difference in power level among channels for output signals from the optical cross-connect was within 2 dB.

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Performances of Erbium-Doped Fiber Amplifier Using 1530nm-Band Pump for Long Wavelength Multichannel Amplification

  • Choi, Bo-Hun;Chu, Moo-Jung;Park, Hyo-Hoon;Lee, Jong-Hyun
    • ETRI Journal
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    • 제23권1호
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    • pp.1-8
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    • 2001

  • The performance of a long wavelength-band erbium-doped fiber amplifier (L-band EDFA) using 1530nm-band pumping has been studied. A 1530nm-band pump source is built using a tunable light source and two C-band EDFAs in cascaded configuration, which is able to deliver a maximum output power of 23dBm. Gain coefficient and noise figure (NF) of the L-band EDFA are measured for pump wavelengths between 1530nm and 1560nm. The gain coefficient with a 1545nm pump is more than twice as large as with a 1480nm pump. It indicates that the L-band EDFA consumes low power. The noise figure of 1530nm pump is 6.36dB at worst, which is 0.75dB higher than that of 1480nm pumped EDFA. The optimum pump wavelength range to obtain high gain and low NF in the 1530nm band appears to be between 1530nm and 1540nm. Gain spectra as a function of a pump wavelength have bandwidth of more than 10nm so that a broadband pump source can be used as 1530nm-band pump. The L-band EDFA is also tested for WDM signals. Flat Gain bandwidth is 32nm from 1571.5 to 1603.5nm within 1dB excursion at input signal of -10dBm/ch. These results demonstrate that 1530nm-band pump can be used as a new efficient pump source for L-band EDFAs.

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Loss mechanism을 고려한 밀도 반전이 고정된 EDFA의 black box 모델링에 대한 연구 (Constant inversion black box model of EDFAs including various loss mechanisms)

  • 민범기;이원재;박재형;박남규
    • 한국광학회지
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    • 제12권3호
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    • pp.205-211
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    • 2001

  • 본 논문에서는 최근 주목받고 있는 장파장 EDFA(Erbium-Doped Fiber Amplifer)에서의 성능 분석, 특히 전력변환률(Power Conversion Efficiency)의 예측을 위한 밀도반전이 고정된 상태에서의 black box 모델을 유도하고 이득이 평탄화된 장파장 EDFA의 요구되는 펌프파워측면에서 수치해석과 실험을 통하여 유도된 모델의 유용성을 증명하였다. 모델을 통한 펌프파워의 예측치는 실험오차 범위내에서 1.9%이내의 정확성을 보였다. 밀도반전이 고정된 상태에서의 black box 모델은 일반적으로 980nm, 1480m, 펌핑의 경우 모두 적용이 가능하며 EDF의 3가지 이상의 길이에 대하여 입력 펌프파워와 입력/출력 신호파워의 관계를 측정하여 밀도반전이 일정한 상태에서 다른 동작점의 성능을 예측할 수 있었다. 또한 단파장 EDFA에서는 손실의 효과가 크게 나타나지 않아 해석적인 해와 일치하는 결과가 알려져 있었으나 이에 비해 장파장 EDFA에서는 여러 가지 손실의 효과가 더욱 크게 작용하게 되며 특히 paired ion의 효과로 인한 손실로써 비선형적인 관계식이 유도됨을 보였다.

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