Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Theoretical and experimental study on ultrahigh-speed clock recovery system with optical phase lock loop using TOAD

TOAD를 이용한 40 Gbit/s OPLL Clock Recovery 시스템에 대한 연구

  • Ki, Ho-Jin (Photonics Research Center, Korea Institute of Science and Technology) ;
  • Jhon, Young-Min (Photonics Research Center, Korea Institute of Science and Technology) ;
  • Byun, Young-Tae (Photonics Research Center, Korea Institute of Science and Technology) ;
  • Woo, Deok-Ha (Photonics Research Center, Korea Institute of Science and Technology)
  • 기호진 (한국과학기술연구원 광기술연구센터) ;
  • 전영민 (한국과학기술연구원 광기술연구센터) ;
  • 변영태 (한국과학기술연구원 광기술연구센터) ;
  • 우덕하 (한국과학기술연구원 광기술연구센터)
  • Published : 2005.02.01
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Abstract

10 GHz clock recovery from 40 Gbit/s optical time-division-multiplexed(OTDM) signal pulses was experimentally demonstrated using an optical phase lock loop based on a terahertz optical asymmetric demultiplexer(TOAD) with a local-reference-oscillator-free electronic feedback circuit. The 10 GHz clock was successfully extracted from 40 Gbit/s signals. The SNR of the time-extracted 10 GHz RF signal to the side components was larger than 40 dB. Also we performed numerical simulation about the extraction process of phase information in TOAD. The lock-in frequency range of the clock recovery is found to be 10 kHz.

40 Gbit/s 광 시분할 신호(OTDM:optical time-division-multiplexed)로부터 클럭 재생된 10 GHz 신호를 얻기 위해 고조모드잠금된 광섬유 레이저와 TOAD(Terahertz Optical Asymmetric Demultiplexer)를 이용하여 광 위상 동기 회로를 구성하였다. 입력된 40Gbit/s 광 신호 펄스로부터 TOAD를 통과한 펄스의 위상 정보를 이용하여 10 GHz로 위상 동기된 신호를 추출하였다. 추출된 10GHz RF 신호와 주변의 잡음 신호의 비는 40 dB 이상으로 측정되었다. 또한 TOAD에서 위상 정보 추출 과정에 대한 시뮬레이션을 수행하였다. 위상 동기 주파수의 작동범위는 입력 광 펄스의 기본 주파수를 중심으로 10 kHz 이내에서 측정되었다.

Keywords

References

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