Journal of the Institute of Electronics Engineers of Korea SD (대한전자공학회논문지SD)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Numerical Investigation on Propagation Characteristics of Novel Grating-Assisted MMI Coupler

새로운 격자 구조형 다중모드 간섭 결합기의 전파특성에 관한 수치 해석적 고찰

  • 호장춘 (한성대학교 정보통신공학과)
  • Published : 2008.11.25
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Abstract

The propagation characteristics of novel grating-assisted multimode interference (GA-MMI) coupler are explicitly and theoretically investigated by using longitudinal modal transmission-line theory (L-MTLT). The coupling efficiency of GA-MMI coupler is evaluated along the variation of grating thickness and duty cycle, and the spectrum is analyzed numerically. The numerical results reveal that the coupling length and the efficiency of $2{\times}2$ GA-MMI coupler along the variation of grating structure have low tolerance and the bandwidth varies dramatically along the output states.

새로운 격자 구조형 다중모드 간섭(GA-MMI) 결합기의 전파특성이 횡방향 모드 전송선로 이론(L-MTLT)을 이용하여 이론적으로 자세하게 고찰되었다. 격자구조의 두께와 duty cycle의 변화에 따른 $2{\times}2$ GA-MMI 결합기의 결합특성을 분석하였으며, 파장변화에 따른 출력 특성을 수치해석 하였다. 수치해석 결과 격자구조의 변화에 따른 GA-MMI 결합기의 결합길이와 결합효율은 작은 허용오차(tolerance)를 나타냈으며, 대역폭은 출력특성에 따라 현저한 차이를 나타내었다.

Keywords

References

  1. L. Soldano and E. Pennings, "Optical multi-mode interference devices based on self-imaging: Principles and applications," J. Lightwave Technol., vol. 13, pp. 615-627, 1995 https://doi.org/10.1109/50.372474
  2. Liu Zhu, Y. Huang, and A. Yariv, "Integration of a Multimode Interference Coupler With a Corrugated Sidewall Bragg Grating in Planar Polymer Waveguide," IEEE Photon. Technol. Lett., vol. 18, pp. 740-742, 2006 https://doi.org/10.1109/LPT.2006.871125
  3. 호광춘, "Bragg 격자구조가 집적된 편광 무의존성 방향성 결합기와 다중모드 간섭결합기의 설계," 한국광학회지, 제 18권 5호, pp. 1-8, 2007 https://doi.org/10.3807/HKH.2007.18.5.295
  4. S. T. Peng and A. Oliner, "Guidance and Leakage Properties of a Class of Open Dielectric Waveguides: Part I-Mathematical Formulations," IEEE Trans. MTT, vol. 29, pp. 843-855, 1981 https://doi.org/10.1109/TMTT.1981.1130465
  5. K. C. Ho, and K. Ho, "Longitudinal Modal Transmission-Line Theory (L-MTLT) of Multilayered Periodic Waveguides," IEICE Trans. Electronics, vol. E88-C, No. 2, pp. 270-274, February 2005 https://doi.org/10.1093/ietele/E88-C.2.270
  6. L. B. Soldano, F. B. Veerman, M. K. Smit, B. H. Verbeek, A. H. Dubost, and E. C. M. Pennings, "Planar Monomode Optical Couplers Based on Multimode Interference Effects," J. Lightwave Technol., vol. 10, pp. 1843-1849, 1992 https://doi.org/10.1109/50.202837