The Journal of the Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회논문지)

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
권호 표지
DOI QR코드

DOI QR Code

Implementation of Polarization-Insensitive Directional Coupler using Curved Waveguides

곡면형 도파로를 사용한 편광 무의존성 방향성 결합기의 구현

  • 호광춘 (한성대학교 정보통신공학과)
  • Received : 2014.10.29
  • Accepted : 2016.02.05
  • Published : 2016.02.29
Download PDF
⟨ Previous Next ⟩

Abstract

The polarization characteristics of polarization-insensitive directional coupler based on double sandwiched rib-type and curved waveguides are explored in detail by using conformal transformation method (CTM) and longitudinal modal transmission-line theory(L-MTLT). To obtain the polarization-insensitive condition of polarization-insensitive curved directional coupler(PI-CDC), the coupling length and coupling efficiency according to the inner radius of PI-CDC are analyzed for quasi-TE and quasi-TM modes. The numerical results show that the PI-CDC with a few micrometer scales can be realized by properly choosing the curvature and structural and material parameters of double sandwiched layers. Furthermore, the mode profiles propagating through PI-CDC are evaluated, and the influence on coupler performance has been investigated.

등각변환 해석법과 종방향 모드 전송선로 이론을 이용하여 이중 샌드위치 Rib-형 도파로에 기초한 곡면형 편광 무의존성 방향성 결합기(PI-CDC)의 편광특성을 자세하게 탐구하였다. 제안한 곡면형 방향성 결합기의 편광 무의존성 조건을 얻기 위하여 곡면의 내부 반경 크기에 따라 변하는 quasi-TE 모드와 quasi-TM 모드의 결합길이와 결합효율을 분석하였다. 수치해석 결과, 수 마이크로미터 크기의 곡면형 편광 무의존성 방향성 결합기는 이중 샌드위치 층의 구조적, 물질적 변수들과 곡률반경을 잘 선택함으로써 구현할 수 있음을 보였다. 또한, 곡면형 편광 무의존성 방향성 결합기에서 전파하는 quasi-TE/TM 모드들의 분포 프로필을 분석하였고, 그 분석을 통하여 곡면이 전파특성에 어떤 영향을 미치는지에 대하여 조사하였다.

Keywords

References

  1. E. A. J. Marcatili, "Bends in optical dielectric guides", Bell Sys. Tech. J. Vol. 48, pp. 2103-2132, 1969. https://doi.org/10.1002/j.1538-7305.1969.tb01167.x
  2. M. Heiblum and J. H. Harris, "Analysis of curved waveguides by conformal transformation", IEEE J. Quantum Electron. Vol. QE-11, pp. 75-83, 1975.
  3. T. Yamamoto and M. Koshiba, "Numerical analysis of curvature loss in optical waveguides by finite-element method", J. Lightwave Technol. Vol. 11, pp. 1579-1583, 1993. https://doi.org/10.1109/50.249899
  4. L. Prkna, M. Hubalek and J. Ctyroky, "Vectorial eigenmode solver for bentwaveguides based on mode matching", IEEE Photon. Technol. Lett. Vol. 13, pp. 2057-2059, 2004.
  5. Details available from www.rsoftinc.com.
  6. Details available from www.rsoftinc.com.
  7. 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, No. 9, pp. 843-855, 1981. https://doi.org/10.1109/TMTT.1981.1130465
  8. 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, 2005. https://doi.org/10.1093/ietele/E88-C.2.270
  9. K. C. Ho, "Implementation of Distributed Feedback Filters using Cascaded Gratings with Different Period", The J. of IWIT, Vol. 13, No. 1, pp. 77-82, 2013.
  10. J. O. Park and W. K. Jang, "Optical metrology for resonant surface acoustic wave in RF device", J. of the Korea Academia-Industrial cooperation Society, Vol. 11, pp. 3435-3440, 2010. https://doi.org/10.5762/KAIS.2010.11.9.3435
  11. J. Lim, J. Koo, J. Lee, S. M. Han, and D. Ahn, "An Efficient Design and Parameteric Study on the Transmission Lines with Substrate Integrated Artificial Dielectric", The J. of Korean Institute of Information Technology, Vol. 8, pp. 53-59, 2010.