Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Cancellation of Phase Noise in 1.4 GHz RF Signal Transferred to a Remote Site through 13 km Fiber

13 km 광섬유를 통하여 원격지로 전송된 1.4 GHz RF 신호의 위상잡음 제거

  • Lee, Won-Kyu (Center for Emerging Measurement Standards, Korea Research Institute of Standards and Science) ;
  • Park, Chang-Yong (Center for Emerging Measurement Standards, Korea Research Institute of Standards and Science) ;
  • Mun, Jong-Chul (Center for Emerging Measurement Standards, Korea Research Institute of Standards and Science) ;
  • Yu, Dai-Hyuk (Center for Emerging Measurement Standards, Korea Research Institute of Standards and Science)
  • 이원규 (한국표준과학연구원 차세대표준연구단) ;
  • 박창용 (한국표준과학연구원 차세대표준연구단) ;
  • 문종철 (한국표준과학연구원 차세대표준연구단) ;
  • 유대혁 (한국표준과학연구원 차세대표준연구단)
  • Received : 2010.04.01
  • Accepted : 2010.06.03
  • Published : 2010.06.25
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Abstract

A fiber-phase-noise compensating system was constructed for a 1.4 GHz reference frequency transferred through a 13-km-long fiber spool. The transfer instability was dependent on the temperature variation of the compensating system. With the room temperature variation stabilized within $0.3^{\circ}C$, the transfer instability was $4.6{\times}10^{-14}$ at 0.8 s of average time and $2.5{\times}10^{-16}$ at 1000 s of average time with the fiber phase noise compensated. However, with the room temperature changed by $3.5^{\circ}C$, the transfer instability was $6.8{\times}10^{-14}$ at 1.2 s of average time and $3.0{\times}10^{-15}$ at 1000 s of average time. From this result, the temperature stability condition for the experimental setup could be determined to obtain a transfer instability of $10^{-16}$ at 1000 s of average time.

13 km 광섬유를 통해 1.4 GHz의 기준 주파수를 전송할 때, 광섬유에서 발생하는 위상잡음을 제거하는 시스템을 구성하였다. 전송된 주파수의 안정도 성능은 실험장치의 온도변화폭에 의존하였다. 실험실의 온도변화폭이 $0.3^{\circ}C$ 이내로 유지되는 동안에는 광섬유의 위상잡음을 제거했을 때, 원격지에 전송된 신호가 0.8초의 평균 시간에서 $4.6{\times}10^{-14}$, 1000초의 평균 시간에서 $2.5{\times}10^{-16}$의 상대주파수 전송 안정도를 보여 만족할 만한 결과이었으나, 실험실의 온도가 $3.5^{\circ}C$ 범위로 변할 때에는, 1.2초의 평균 시간에서 $6.8{\times}10^{-14}$, 1000초의 평균 시간에서 $3.0{\times}10^{-15}$의 전송 안정도를 보였다. 이 결과로부터 1000초의 평균시간에서 $10^{-16}$ 수준의 상대주파수 안정도를 얻기 위해서 요구되는 실험장치의 온도 안정도 조건을 제시할 수 있었다.

Keywords

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