13 km 광섬유를 통하여 원격지로 전송된 1.4 GHz RF 신호의 위상잡음 제거
Cancellation of Phase Noise in 1.4 GHz RF Signal Transferred to a Remote Site through 13 km Fiber
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초록
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℃ 이내로 유지되는 동안에는광섬유의 위상잡음을 제거했을 때, 원격지에 전송된 신호가 0.8초의 평균 시간에서 4.6×10-14, 1000초의 평균 시간에서 2.5×10-16의상대주파수 전송 안정도를 보여 만족할 만한 결과이었으나, 실험실의 온도가 3.5℃ 범위로 변할 때에는, 1.2초의 평균 시간에서6.8×10-14, 1000초의 평균 시간에서 3.0×10-15의 전송 안정도를 보였다. 이 결과로부터 1000초의 평균시간에서 10-16 수준의 상대주파수 안정도를 얻기 위해서 요구되는 실험장치의 온도 안정도 조건을 제시할 수 있었다.
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℃, the transfer instability was 4.6×10-14 at 0.8 s of average time and 2.5×10-16 at 1000 s of average time with the fiber phase noise compensated. However, with the room temperature changed by 3.5℃, the transfer instability was 6.8×10-14 at 1.2 s of average time and 3.0×10-15 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.
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