Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Study on direct optical switching CDM at 40 GHz-band for Radio-over-Fiber(RoF) system

Radio-over-Fiber 시스템을 위한 40 GHz 대역에서 직접 광스위칭 CDMA 연구

  • 최재원 (한국과학기술연구원 광기술연구센터) ;
  • 전영민 (한국과학기술연구원 광기술연구센터) ;
  • 변영태 (한국과학기술연구원 광기술연구센터) ;
  • 우덕하 (한국과학기술연구원 광기술연구센터) ;
  • 박종대 (명지대학교 전자공학과) ;
  • 서동선 (명지대학교 전자공학과)
  • Published : 2003.12.01
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Abstract

We have experimentally demonstrated a Direct Optical Switching (DOS) CDMA for future wide-band mobile communication systems at the 40 ㎓ band by using orthogonal (crosscorrelation $\leq$2) unipolar type codes with code length of 16 and chip rate of 2.5 Gcps for radio-over-fiber (RoF) systems. Pulse-amplitude-equalized 40 ㎓ laser pulses were provided by rational-harmonically mode-locking a 10 ㎓ fiber ring laser.

Radio-over-Fiber(RoF) 시스템에서 직접 광스위칭 CDMA(Direct Optical Switching CDMA : DOS-CDMA) 기법을 이용하여 기존 이동통신에서 연구되어왔던 수 ㎓ 대역보다 주파수가 훨씬 높은 40 ㎓ 대역의 MMW (millimeter wave)를 반송파로 사용한 차세대 이동통신을 위한 MMW DOS-CDMA 시스템 연구를 실험적으로 수행했다. 부호 분할 다중화에 사용된 직교 부호(orthogonal codes)는 단극성(unipolar) 형태의 상호상관이 2이하(crosscorrelation$\leq$2)인 부호열을 선택했으며, 부호 길이(code length)는 16 chips, 칩율(chip rate)은 2.5 Gchip/sec 였다. 광원은 10 ㎓ 광섬유 링 레이저를 유리고조모드 잠김시켜 진폭 균등화한 40 ㎓ 의 안정된 레이저 펄스를 발생시켜 사용하였다.

Keywords

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