Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Simultaneous modulation of digital/SCM signal using a single LD for broadcasting in PON based optical access network

PON 기반 광가입자망에서 방송 신호 전송을 위한 단일 LD을 이용한 디지털/SCM 신호 동시 변조기술

  • Kim Tae-Young (Dept. of Electrical and Electronic Eng., Yonsei Univ.) ;
  • Kim Kyung-Hyun (Dept. of Electrical and Electronic Eng., Yonsei Univ.) ;
  • Han Sang-Kook (Dept. of Electrical and Electronic Eng., Yonsei Univ.)
  • 김태영 (연세대학교 전기전자공학과) ;
  • 김경현 (연세대학교 전기전자공학과) ;
  • 한상국 (연세대학교 전기전자공학과)
  • Published : 2006.05.01
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Abstract

By comparing video-overlay method where digital and SCM signal are modulated in different optical source, we experimentally investigated the performance of simultaneous modulation of data and broadcasting signals using a single LD for broadcasting in PON based optical access network. The experimental results show that by increasing the minimum value of injected current for LD modulation above about 1.5 times of threshold current of LD, data and broadcasting signals can modulate without mutual interference. We also proposed and demonstrated the scheme of optical transmitter optimized for simultaneous modulation of data and broadcasting signals where anode and cathode of LD are separately used as signal interface for data and broadcasting signals, respectively.

PON기반 광가입자망에서 방송신호 전송을 위한 방법으로써 단일 LD를 이용한 디지털/SCM신호 동시 변조방식의 성능을 파장이 다른 두개의 LD에 디지털 및 SCM신호를 각각 변조한 방식과 비교하였다. 실험을 통해, 변조를 위해 인가되는 전류의 최소값이 LD의 threshold 전류의 약 1.5배 이상인 경우 디지털 및 SCM신호의 상호간섭이 최소화됨을 확인하였다. 또한 LD의 anode 단자와 cathode 단자에 각각 디지털 및 SCM신호를 인가함으로서 효율적으로 회로설계가 가능한 광송신기 구조를 제안하고 실험적으로 검증하였다.

Keywords

References

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