• Title/Summary/Keyword: Erbium-doped fiber 링레이저

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Tunable and switchable multi-wavelength erbium-doped fiber ring laser (파장변환과 스위칭이 가능한 다파장 어븀 첨가 광섬유 링 레이저)

  • Jang, Hyun-Soo;Lee, Kyung-Shik
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.42 no.7 s.337
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    • pp.13-20
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    • 2005
  • We propose an erbium-doped fiber ring laser whose multi-wavelength oscillation is tunable and switchable by tuning fiber bragg gratings. By applying axial pressure on the fiber bragg grating, the wavelength spacing of the proposed laser can be tuned continuously. And by adjusting a polarization controller(PC), the proposed laser can be switched among dual-, triple- and four-wavelength lasing operations.

Wavelength spacing tunable multi-wavelength Erbium-doped fiber ring laser (파장간격 가변형 다파장 어븀 첨가 광섬유 링 레이저)

  • Kim, Hwan;Jang, Hyun-Soo;Park, Kwang-No;Lee, Kyung-Shik
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.45 no.2
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    • pp.55-60
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    • 2008
  • Multi-wavelength Erbium-doped fiber(EDF) ring laser was developed by using a sampled fiber Bragg grating reflecting multiple wavelengths, which was formed by impressing periodical pressure on the outside of a fiber Bragg grating. The wavelength spacing was varied to 4.1nm, 1.41nm and 0.82nm, by pressing the grating with the pressure period $200{\mu}m$, $580{\mu}m$ and $1000{\mu}m$, respectively.

Spectroscopy of acetylene (13C2H2) using a tunable erbium-doped fiber ring laser (파장가변 광섬유 링 레이저를 이용한 아세틸렌(13C2H2) 분광)

  • 유한영;오정미;이동한;문한섭;이원규;박갑동;서호성
    • Korean Journal of Optics and Photonics
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    • v.14 no.6
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    • pp.674-679
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    • 2003
  • We fabricated erbium-doped fiber ring laser with a new structure that can operate in C- & L-band wavelength region. The wave-length of the laser can be tuned continuously over 102 nm between 1510.4-1612.6 nm by insertion of the fiber Fabry-Perot tunable filter (FFP-TF) in the ring cavity. By use of the wavelength tunable characteristics of our fiber laser, we measured absorption spectra of more than fifty transition lines of the acetylene ($^{13}$ C$_2$H$_2$) molecule with high signal to noise ratio (SNR).

Single-frequency Wavelength Tunable Erbium-doped Fiber Ring Laser (단일 주파수로 발진하는 파장 가변 어븀 첨가 광섬유 링 레이저)

  • Kim, Ryun-Kyung;Chu, Su-Ho;Han, Young-Geun
    • Korean Journal of Optics and Photonics
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    • v.21 no.5
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    • pp.185-189
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    • 2010
  • We demonstrate a single-frequency wavelength tunable erbium-doped fiber (EDF) ring laser. We used an unpumped-EDF as a saturable-absorber in order to obtain a stable single-frequency with a narrow-linewidth single-polarization mode in the ring cavity. The lasing wavelength was controlled by using bending-induced strain, such as tension and compression strain corresponding to the bending direction, applied to the fiber gratings. The fiber laser exhibited an output power of -1.85 dBm at a wavelength of 1540.72 nm for a pumping power of ~400 mW. An extinction ratio was measured to be more than 60 dB. The proposed tunable fiber laser maintains nearly the same output power while its lasing wavelength is controlled over in a wavelength range of 5 nm.

Remote Measurement of a Distant Temperature and Current using Fiber Bragg Grating Sensors and Erbium-doped Fiber Ring Laser (어븀 첨가 광섬유형 링 레이저와 광섬유 격자 기반 센서를 이용한 원거리의 온도 및 전류 측정)

  • Sohn, Kyung-Rak;Shim, June-Hwan;Yang, Gyu-Sik
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.8
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    • pp.1257-1262
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    • 2008
  • A long-distance remote sensing of temperature and current based on a fiber Bragg grating (FBG) is proposed and demonstrated. The thermal expanding effect of the epoxy and the Er-doped fiber ring laser (EFRL) are applied to the sensor system to enhance the temperature and current sensitivity. An EFRL with a 5 km-single-mode fiber and a FBG shows a high extinction ratio of more than 60 dB and a low power fluctuation of less than 1 dB. The metal wires are used to supply the current to the sensors. When the NOA65 puts on the FBG as a thermal expanding material, the temperature and current sensitivity of the lasing wavelength shift are about $30\;pm/^{\circ}C$ and 3pm/mA, respectively. The proposed sensing scheme is useful for measurement of current or temperature at a distant object of more than several km.

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

  • 박갑동;박재형;이재형;장준성
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.08a
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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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