광연결을 위한 포토폴리머형 홀로그래픽 부피격자 커플러의 설계 및 구현
Design and implementation of photopolymer-based holographic volume grating couplers for optical interconnection
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홀로그래픽 부피격자 커플러(VGC : volume grating coupler)는 높은 선택적 결합효율, 건식 제조공정, 콤팩트한 소자 제작이 가능하고 저렴하기 때문에 광연결 기술의 구현 및 응용에 매우 매력적인 소자로 간주되고 있다. 본 논문에서는 도파로형 광연결에 적용키 위한 45° 격자 경사각을 갖는 도파로 삽입형 입·출력 VGC를 DuPont사의 HRF600-20 홀로그래픽 포토폴리머를 이용하여 설계, 구현하기 위한 방법을 제안하였다. 그리고 제안한 VGC 소자의 유용성을 입증키 위해 동작파장이 각각 632.8nm 및 1550nm인 VGC를 제작하고 실험결과를 제시하였다. 실험결과 632.8nm 파장에서 동작하는 격자주기가 0.5인 단일 VGC의 경우 TE 편광에서 입력 결합효율은 86.6% 이상이고, 1550nm 파장에서 동작하는 격자주기가 0.73068인 1×2 VGC의 입력 결합효율은 ～90.9%의 특성을 나타내었다.
Abstract
Holographic volume grating couplers (VGCs) are become increasingly attractive device for the application of optical interconnects because of their higher preferential coupling, dry fabrication processing, compact, and low cost. In this paper, the analysis, design, and implementation of the waveguide-imbedded input-output VGC with 45° grating slant angle using holographic photopolymer(DuPont HRF600-20) for guided-wave optical interconnection applications, are presented. To show the usefulness of the proposed VGC, we fabricated the VGCs operating at 632.8nm and 1550nm wavelengths and its results are presented. The measured input coupling efficiency of the single VGC with grating period at 632.8nm wavelength is above 86.6% for TE-polarization. The input coupling efficiency of the 1×2 VGC with 0.73068 grating period at 1550nm wavelength is about 90.8%.
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