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채널간 파장간격 Δλ=2nm인 4채널 WDM 광소자 설계 및 특성에 관한 연구
라경태,김필중,윤중현,김상덕,김종빈 조선대학교 전자정보통신연구소 2000 電子情報通信硏究所論文誌 Vol.3 No.1
WDM/FDM is expected to be a basic technology for constructing cost-effectively high-speed and large capacity optical networks in the future, device technologies for supporting WDM/FDM function have begun to be studied actively In this paper, we proposed a 4 channel WDM optical device and simulated it based on Mach-Zehnder Interferometer with channel spacing Δλ=2nm at central wavelength λ =1 55㎛. So, we assumed initial condition that core dimension, 6㎛×6㎛, core index, 1 455, clad index, 1 444 at wavelength 1 55㎛, and the separation between channel waveguides, 4㎛ From this condition, we analyzed a channel waveguide and optical coupler(3㏈ coupler), simulated a single Mach-Zehnder Interferometer, and then designed a 4 channel WDM
WDM 광소자 제작을 위한 S-Bend형 방향성 결합기 설계에 관한 연구
라경태,윤중현,김상덕,최현용,김종빈 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2
In this paper, we proposed a waveguide offset-applied S-Bend type directional coupler for reducing loss and complete coupling. Calculation results were gained by effective index method and simulated by beam propagation method. Condition for calculation are as follows. Refractive index difference between core and clad is 0.75%, clad index is 1.444, waveguide separation is 3 ㎛, and curvature radious is 10000 ㎛. As results from simulation, 3 dB coupler and full coupling directional coupler have to introduce a waveguide offset 0.25 ㎛ for minimum insertion loss and complete coupling, and we certificated that waveguide offset affected to insertion loss properties. Hence, we found that a directional coupler for wavelength division (de)multiplexing has to introduce a proper waveguide offset.
WDM 광소자 개발을 위한 점정합법에 의한 사각형 광도파로 해석
라경태,김상덕,김종빈 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1
This paper describes a point matching method that is based on an expansion of the electromagnetic field in terms of a series of Bessel and modified Bessel functions multiplied by trigonometric functions. In this method, the electric and magnetic fields inside the waveguide core are matched to those outside the core a t matching points on the boundary to yield matrix equations. The paper presents the results of the computation in the form of curves of the propagation constants. The propagation curves are presented in a form of refractive index independent. Also, the paper presents a energy distribution of various modes relative inside the core to outside the core. As a result of this analysis, we are certain that a point matching method can be used usefully for the analysis of optical device such as multichannel optical filter, optical splitter and combiner, high density FDM/WDM device and etc., based on rectangular optical waveguide whether refractive index difference is large or not.
WDM 소자 개발을 위한 S형 광도파로의 Bending 손실 감소에 관한 연구
소성진,라경태,윤중현,정래성,김종빈 조선대학교 전자정보통신연구소 1999 電子情報通信硏究所論文誌 Vol.2 No.1
The excess loss that occurs in waveguide bend can be minimized by offsetting the connecting waveguide so as to reduce the transition loss at the junctions. Such bends were investigated in detail by employing the BPM(Beam Propagation Method) and it was found that they can be optimized with respect to overall loss In the addition, S-shaped waveguides and directional couplers with offset junctions were simulated by BPM
김필중,윤중현,라경태,김경호 木浦大學校 情報産業硏究所 1999 情報産業硏究誌 Vol.7 No.-
Abandoned bad DRAM chips have increased by 1-2 bit defective cells after package with high integrated memory. To repair this 1-2 bit defective cells. an antiques repair method of electrical repair method is using instead of laser repair method. This antiques repair method require high voltage over 7v to program antiques element. In this paper, the high voltage generated in chip without added pin or pad. The high voltage generator was designed using not conventional MOS devices but pn diodes and stacked comb capacitors. Threshold voltage of pn diode is about 0.8v. and stacked comb capacitor have much capacitance of 5-6 times than conventional planar capacitor. The output voltage of designed high voltage generator are 7.4-8.4v. and the output current driveability is maximum 480㎂.