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위상잡음 제거에 의한 광섬유망에서의 높은 안정도의 RF 전송

Highly Stable RF Transfer over a Fiber Network by Fiber-induced Phase Noise Cancellation

  • 이원규 (한국표준과학연구원 기반표준부 길이/시간그룹) ;
  • 이대수 (한국표준과학연구원 기반표준부 길이/시간그룹) ;
  • 김영범 (한국표준과학연구원 기반표준부 길이/시간그룹) ;
  • 권택용 (한국표준과학연구원 기반표준부 길이/시간그룹)
  • Lee, Won-Kyu (Length/Time Metrology Group, Division of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Yee, Dae-Su (Length/Time Metrology Group, Division of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Kim, Young-Beom (Length/Time Metrology Group, Division of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Kwon, Taeg-Yong (Length/Time Metrology Group, Division of Physical Metrology, Korea Research Institute of Standards and Science)
  • 발행 : 2006.12.25

초록

높은 안정도를 가지는 100 MHz의 RF 신호를 23 km의 광섬유망을 통하여 전송하였다. 진동과 온도 변화에 의하여 생기는 광섬유 전송과정에서의 위상 잡음을 측정하고 이를 보상하는 회로를 구성하였다. 광섬유 잡음이 제거되었을 때, RF 신호 전송의 상대주파수 불안정도는 1초 평균시간에서 $6{\times}10^{14}$, 10000초 평균시간에서 $2{\times}10^{-17}$으로서 기준 RF 신호의 안정도와 거의 같은 수준으로 광섬유를 통하여 RF를 전송할 수 있었다. 잡음 보상에 의하여 단측파대 위상잡음은 푸리에 주파수 1 kHz 이하에서 20 dB 이상 감소하였다.

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