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Compact Design and Fabrication of 'Improved QS-MMI' Demultiplexer

Improved QS-MMI' 1.31/1.55μm 파장분리기의 최적화 설계 및 제작

  • Kim, Nam-Kook (School of Information and Communication Engineering, INHA University) ;
  • Kim, Jang-Kyum (School of Information and Communication Engineering, INHA University) ;
  • Choi, Chul-Hyun (School of Information and Communication Engineering, INHA University) ;
  • O, Beom-Hoan (School of Information and Communication Engineering, INHA University) ;
  • Lee, Seung-Gol (School of Information and Communication Engineering, INHA University) ;
  • Park, Se-Gun (School of Information and Communication Engineering, INHA University) ;
  • Lee, El-Hang (School of Information and Communication Engineering, INHA University)
  • 김남국 (인하대학교 정보통신공학과) ;
  • 김장겸 (인하대학교 정보통신공학과) ;
  • 최철현 (인하대학교 정보통신공학과) ;
  • 오범환 (인하대학교 정보통신공학과) ;
  • 이승걸 (인하대학교 정보통신공학과) ;
  • 박세근 (인하대학교 정보통신공학과) ;
  • 이일항 (인하대학교 정보통신공학과)
  • Published : 2005.06.01

Abstract

We designed and fabricated a compact multi-mode interference (MMI) wavelength demultiplexer using the concept of 'Improved Quasi-State' modes. The output power and extinction ratio were improved by utilizing modal phase error which is specially occurred in low-index contrast. For a designed demultiplexer, the mode propagation analysis with effective index approximation shows significant improvement of extinction ratio to -25 dB for both $1.31{\mu}m\;and\;1.51{\mu}m$ wavelength region and the split-length was reduced about 1/5 of other MMI devices. The fabricated device shows successful characteristics for both 1.31 and $1.55{\mu}m$ wavelengths. These results demonstrate the potential of low-index materials system and the embossing process for photonic integrated circuits.

다중모드간섭 기반의 $1.31/1.55{\mu}m$ 파장분리기의 크기 및 성능개선을 위해 'Improved Quasi-State' 불완전 단일상 개념을 설계에 도입하였다. 코어와 클래딩의 굴절률 차이가 작은 경우의 모드간 위상오차를 역이용 하도록 설계하여 'Quasi-State'의 출력 파워와 소멸비를 월등히 개선하였다. 다중모드간섭기의 폭이 $14.4{\mu}m$, 입력도파로의 수평 이동이 $5.3{\mu}m$가 되도록 설계한 구조를 유효굴절률법과 MPA를 사용하여 분석한 결과 최대 소멸비는 양 파장대역 모두 -25dB 이하로 나타났다. 설계된 파장분리기는 일반적인 다중 모드간섭기의 길이의 1/5정도에 불과한 $2620{\mu}m$의 간섭길이를 가진다. 소프트 리소그래피 공정을 통해 설계된 파장분리기를 제작하였으며, $1.31{\mu}m$$1.5{\mu}m$의 성공적인 파장분리를 확인하였다.

Keywords

References

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