Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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A time delay measurement of a chirped fiber grating by using bidirectional modulation of an optical intensity modulator

광변조기의 양방향 변조를 이용한 chirped fiber grating의 시간지연 측정법

  • Jeon, Geum-Soo (Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Lee, Yong-Gu (Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Ban, Jae-Kyung (Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Heo, Hyun (Department of Information and Communication, Cheong-Am College)
  • 전금수 (전북대학교 전자정보공학부, 전북대학교 전자정보신기술연구센터) ;
  • 이용구 (전북대학교 전자정보공학부, 전북대학교 전자정보신기술연구센터) ;
  • 반재경 (전북대학교 전자정보공학부, 전북대학교 전자정보신기술연구센터) ;
  • 허현 (순천청암대학 정보통신학과)
  • Published : 2002.12.01
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Abstract

A simple method for a time delay measurement of a chirped fiber grating by using bidirectional modulation of a Mach-Zehnder modulator has been proposed. The bidirectionally modulated light with time difference makes an interference fringe in the RF domain. The time delay of a chirped fiber grating can be obtained by measuring the period of the RF interference fringe for different wavelengths. We have measured the time delay of a chirped fiber grating with a chirped length of 5 cm and a bandwidth of 3.16 nm. The average slope of the time delay has been measured to be 183 ps/nm and its uncertainty has been less than $\pm$1.7%.

본 논문에서는 Mach-Zehnder변조기 양방향 변조를 이용하여 chirped fiber grating의 시간지연을 측정할 수 있는 간단한 시스템을 제안하였다. 시간차를 두고 양방향 변조된 광신호는 RF영역에서 주기적인 간섭무늬를 만들게 된다. 이러한 광파장에 따라 변하는 간섭무늬의 주기를 측정하여 chirped fiber grating의 시간지연을 측정할 수 있다 5cm의 chirp과3.16nm의 대역폭을 갖는 chi ed fiber grating의 시간지연을 측정하였으며 측정된 시간지연의 평균 기울기는 183ps/nm이고 고1.7%보다 작은 오차 범위에서 측정되었다.

Keywords

References

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