The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Implementation of real-time free-space optical interconnection using spatial light modulator

공간광변조기를 이용한 실시간 자유공간 광연결 구현

  • 이득주 (충북대학교 대학원 정보통신공학과) ;
  • 강봉균 (충북대학교 대학원 정보통신공학과) ;
  • 김남 (충북대학교 대학원 정보통신공학과) ;
  • 서호형 (한국전자통신연구원 기초기술연구부)
  • Published : 1997.05.01
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Abstract

Dynamic free-space optical interconnection system is experimented by a holographic crossbar with single-state switching architecture. For dynamic operation, electrically addressed liquid-crystal spatial light modulator and diffraction gratings are used in place of passive holograms of matrix-matrix crossbar. Diffraction gratings are consisted of regular cells which have different phase delays. This pixelated phase grating array displayed on SLM(Spatial Light modulator) deflects an input beam toward a wanted direction or splits an input beam into many beams and then steers them to desired positions. Through the experimental results, free-space optical interconnection is dynamically perfomed using a computer, SLM and phase diffraction gratings.

단일 스테이지 스위칭 구조를 갖는 홀로그래픽 크로스바에 의한 동적인 자유공간 광연결을 실험하였다. 동적인 동작을 위해 전기적인 주소지정방식의 액정 공간광변조기와 회절격자가 매트릭스-매트릭스 크로스바에서의 고정적인 홀로그램을 대신하여 사용되었다. 회절격자는 규칙적인 셀들로 이루어졌으며 각 셀마다 서로 다른 위상지연 정도를 갖는다. 이러한 화소형 위상격자 배열을 공간광변조기에 띄어 입력빔의 방향으로 편향시키거나 여러 빔으로 분리한 후 원하는 위치로 빔의 방향을 조종한다. 이러한 실험결과 컴퓨터와 공간광변조기, 위상형 회절격자를 이용하여 자유공간 광연결이 동적으로 수행됨을 보였다.

Keywords

References

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