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허형준,김상인 한국광학회 2017 Current Optics and Photonics Vol.1 No.5
We proposed an integrated wavelength-selective photodetector based on a grating-assisted contradirectionalcoupler and a graphene absorption layer for a coarse wavelength division multiplexing (CWDM)communication system. The center wavelength of the absorption spectrum of the proposed device can betuned simply by changing the period of the grating, and the proposed device structure is suitable to forminga cascaded structure. Therefore, an array of the proposed device of different grating periods can be usedfor simultaneous wavelength demultiplexing and signal detection in a CWDM communication system. Ourtheoretical study showed that the designed device with a grating length of 500 μm could have an absorptionof 95.1%, an insertion loss of 0.2 dB, and a 3 dB bandwidth of 7.5 nm, resulting in a -14 dB crosstalkto adjacent CWDM channels. We believe that the proposed device array can provide a compact and economicsolution to receiver implementation in the CWDM system by combining functions of wavelengthdemultiplexing and signal detection.
광섬유와 격자구조 도파로 결합기 설계를 위한 결합 모드 이론 분석
허형준(Hyung-Jun Heo),김상인(Sang-In Kim) 한국전자통신학회 2017 한국전자통신학회 논문지 Vol.12 No.4
저밀도 파장분할다중화 기술을 광 집적 소자에 효율적으로 활용하기 위하여 광섬유와 평면기판 내 광 도파로 사이의 파장 선택적 광 결합기 구조가 효율적인 수단으로 고려될 수 있다. 본 논문에서는 공기 도랑 격자를 지닌 실리콘 도파로와 단일 모드 광섬유 간 결합을 고려하였다. 격자의 깊이에 따른 결합 효율의 경향성과 그 한계점을 조사하였다. 이를 위해 결합 모드 이론에 기반을 둔 모델링을 통하여 설계된 결합기 구조의 결합효율을 예측하고, 유한요소법을 이용한 시뮬레이션 결과와 정량적으로 비교 분석 하였다. In order to effectively utilize the Coarse Wavelength Division Multiplexing(CWDM) technology in optical integrated devices, a design of a wavelength selective coupler structure between an optical fiber and an optical waveguide in a flat substrate is can be considered. In this paper, we consider the coupling between a silicon waveguide with an air trench and a single mode fiber. We investigated the tendency of coupling efficiency and its limitations according to the grating depth. For this purpose, the coupling efficiency of coupler structure designed through modeling based on coupled mode theory is predicted and quantitatively compared with simulation results using finite element method.