한국광학회지 (Korean Journal of Optics and Photonics)

  • 제19권1호
  • /
  • Pages.60-67
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  • 2008
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  • 1225-6285(pISSN)
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  • 2287-321X(eISSN)
한국광학회 (Optical Society of Korea)
권호 표지
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전광 그레이코드 이진코드 변환기

All-Optical Gray Code to Binary Coded Decimal Converter

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

전광 그레이코드(gray code) 이진코드(binary code) 변환기를 상용화 전산모사 프로그램(VPI)을 이용하여 처음으로 구현하였다. 전자회로 디자인 방법을 상호 이득변조를 이용한 전광 논리회로에 적합하도록 변형하여, 이상적이지 않은 전광 논리게이트에 의한 신호 왜곡이 최소화 되도록 하였다. 2.5 Gbps의 20 dB 소광비를 가지는 입력 신호에 대해, 신호재생기 없이 가장 많이 왜곡된 출력 신호에 (최하위 비트-LSB) 대해 약 4 이상의 Q값을 얻을 수 있었다. 또한 그레이 코드 이진코드 변환기를 디자인하면서, 이단 단순화 방법을 (two-level simplification method) 변형하여, 그레이코드 이진코드 변환기뿐 아니라 일반적인 전광 회로에 적용할 할 수 있는 일반적 방법을(일단 단순화 방법: one-level simplification method) 얻을 수 있었다.

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.

키워드

참고문헌

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