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파장가변 필터를 위한 Plane-Concave Fabry-Perot 공진기의 해석
예윤해,Yeh YunHae 한국광학회 2004 한국광학회지 Vol.15 No.6
파장가변 필터를 목적으로 plane-concave 거울쌍으로 구성된 Fabry-Perot 공진기에 대한 해석모델을 제안하고, 이를 실제 제작과정에서의 변수 값을 적용하여 해석한 결과를 제시하였다. 공진기의 결합손실과 거울의 손실이 필터의 삽입손실에 가장 큰 변수로 작용하며, plane-concave 거울쌍 구성을 이용하여 finesse가 600, FSR이 57 nm, 삽입손실 (insertion loss)이 3 dB 이하인 필터를 구현하기 위해서는 손실이 0.09% 이하인 거울을 사용하여 공진기의 결합손실이 0.1% 이하가 되도록 오목거울의 곡률반경과 정렬상태를 조절하여야 하는 것으로 밝혀졌다. We proposed an analysis model for a Fabry-Perot cavity constructed with a plane-mirrored optical fiber and a concave-mirrored one. We presented the analysis results calculated by inserting practical values into the equations derived. The coupling loss of the cavity and the mirror loss are the most important parameters in reducing the insertion loss of the filter. In order to build a filter of finesse 600, FSR 57 nm, and insertion loss < 3 dB, the plane-concave cavity using mirrors of loss < 0.09% should be aligned for the coupling loss to be less than 0.1 %.
조내현(NaiHyun Cho),예윤해(YunHae Yeh),정연모(Yunmo Chung) 한국시뮬레이션학회 2004 한국시뮬레이션학회 논문지 Vol.12 No.4
In this paper, we propose a model that simulates the reflective waveform from underwater objectsby meansofDopplereffect,highlightandelongation phenomenon. Also,this paper presents a hardware implementation ofsimulation model with the input and output parameters. The underwater target simulator consists of transducer, receiver,transmitter and control parts. According to the experimental results of the simulator, it carried out the performances of real target in response to transmission signal.
예윤해 慶熙大學校 레이저 工學硏究所 2003 레이저공학 Vol.14 No.-
The signal processing algorithm for white light interferometry, which conducts a series of analog signal processing to locate the central interference fringe with high speed, is reviewed to find the problems with it. The main causes of the problems are the temperature dependence of the Path-matching Michelson interferometer and the nonlinearity between the peak spacing in the interferogram and the measured spacing by the algorithm when the spacing is comparable to the coherence length of the optical source. Temperature dependence of the path-matching interferometer is calculated to be 2.87 ㎛/℃ and it is essential to build a drift-free path-matching interferometer.