Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Improvement of extinction ratio of amplified pulses by incorporating a nonlinear optical loop mirror

EDFA로 증폭된 고출력 펄스 신호의 소광비 향상

  • 김병준 (충남대학교 자연과학대학 물리학과 광전자 실험실) ;
  • 최현범 (충남대학교 자연과학대학 물리학과 광전자 실험실) ;
  • 이한협 (충남대학교 자연과학대학 물리학과 광전자 실험실) ;
  • 이동한 (충남대학교 자연과학대학 물리학과 광전자 실험실) ;
  • 김대연 (국방과학 연구소 1부9팀) ;
  • 권일범 (한국표준과학연구원 산업측정표준부)
  • Published : 2003.04.01
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Abstract

A two-stage erbium-doped fiber amplifier (EDFA) with a band pass filter is used to get optical pulses of high peak value. The pulse signal has a 32 ㏈ extinction ratio, 125 W peak power and 79 ㎽ pulse off power. A nonlinear optical loop mirror (NOLM) is used to lower the pulse off power so as to increase the extinction ratio. The pulse signal after the NOLM has a 50.4 ㏈ extinction ratio, 35 W peak power and 0.3 ㎽ pulse off power.

높은 peak 값의 광 펄스 신호를 얻기 위하여 대역통과 필터(band pass filter)를 사용한 2단 구조 erbium-doped fiber amplifier (EDFA)를 구성하여 125 W peak 값과 32 ㏈ 소광비(extinction ratio)를 갖는 펄스 신호를 얻었다. 이때 pulse off power는 79 ㎽이다. pulse off power를 낮추고 소광비를 높이기 위하여 nonlinear optical loop mirror(NOLM)을 사용하였다. NOLM 을 통과한 펄스 신호는 35 W peak 값과 0.3 ㎽ pulse off power, 50.4 ㏈ 소광비를 갖는다.

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References

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