Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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60 GHz Optical Carrier Generator using Quasi-Velocity-Matching Technique

Quasi-Velocity-Matching물 이용한 60 GHz 광캐리어 발생기

  • Kim, W.K. (NANO Bio Research Center, Korea Electronics Technology Institude) ;
  • Yang, W.S. (NANO Bio Research Center, Korea Electronics Technology Institude) ;
  • Lee, H.M. (NANO Bio Research Center, Korea Electronics Technology Institude) ;
  • Lee, H.Y. (NANO Bio Research Center, Korea Electronics Technology Institude) ;
  • Jeong, W.J. (School of Electrical and Computer Engineering, University of Seoul) ;
  • Kwon, S.W. (Department of Materials Engineering, Hankuk Aviation University)
  • 김우경 (전자부품연구원 나노바이오센터) ;
  • 양우석 (전자부품연구원 나노바이오센터) ;
  • 이형만 (전자부품연구원 나노바이오센터) ;
  • 이한영 (전자부품연구원 나노바이오센터) ;
  • 정우진 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 권순우 (한국항공대학교 항공재료공학과)
  • Published : 2006.04.01
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Abstract

A novel 60GHz optical carrier generator with a polarization domain-inverted structure is suggested and is demonstrated. The two arms of the Mach-Zehnder optical waveguide are periodically poled for quasi-phase velocity matching between the optical wave at 1550nm and the RF wave at 30 GHz. The center frequency of band-pass modulation and the 3 dB bandwidth of the fabricated modulator were measured to be 30.3 GHz and 5.1 GHz, respectively. Sub-carriers with the frequency difference of 60GHz waeregenerated under appropriate DC biac voltage application while the carrier was suppressed to lead to the power ratio between the modulated sub-carrier and the suppressed fundamental carrier of 28 dB, which proves that double sideband- suppressed carrier(DSB-SC) operation can be realized by the suggested single device.

리튬나이오베이트 기판의 분극 반전 기술을 이용하여 300Hz 대역 광변조기를 제작하였고 60 GHz 광캐리어 발생기로 응용하였다. 주기적인 분극반전은 도파광과 RF사이의 QVM(Quasi-Velocity-Matching)을 유발하여 대역변조를 가능하게 하였다. 제작된 광변조기는 30.3 GHz에서 최대 변조효율을 보였으며, 3 dB 변조 대역폭은 약 5.1 GHz로 측정되었다. DSB-SC(Double Sideband Suppressed Carrier) 측정 실험을 통해 입사된 광 주파수로부터 30 GHz 간격으로 USB(Upper Sideband)와 LSB(Lower Sideband)를 발생시켰으며 입사광의 스펙트럼은 발생된 USB 혹은 LSB에 비해 28 dB정도 억제됨으로써, 30GHz 대역 광변조기가 60 GHz 광캐리어 발생기로 응용될 수 있음을 보였다.

Keywords

References

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