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All-Optical Gray Code to Binary Coded Decimal Converter

전광 그레이코드 이진코드 변환기

  • 정영진 (서울대학교 전기컴퓨터 공학부) ;
  • 박남규 (서울대학교 전기컴퓨터 공학부) ;
  • 전영민 (한국 과학기술 연구원) ;
  • 우덕하 (한국 과학기술 연구원) ;
  • 이석 (한국 과학기술 연구원)
  • Published : 2008.02.29

Abstract

An all-optical 4-bit Gray code to binary coded decimal (BCD) converter by means of commercially available numerical analysis tool (VPI) was demonstrated, for the first time to our knowledge. Circuit design approach was modified appropriately in order to fit the electrical method on an all-optical logic circuit based on a cross gain modulation (XGM) process so that signal degradation due to the non-ideal optical logic gates can be minimized. Without regenerations, Q-factor of around 4 was obtained for the most severely degraded output bit (least significant bit-LSB) with 2.5 Gbps clean input signals having 20 dB extinction ratio. While modifying the two-level simplification method and Karnaugh map method to design a Gray code to BCD converter, a general design concept was also founded (one-level simplification) in this research, not only for the Gray code to BCD converter but also for any general applications.

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