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김형래,곽계달 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.11
In this paper, we developed a two-dimensional numerical simulator which could analyze the stripe geometry semiconductor laser diodes by modifying the commercial semiconductor device simulator, MEDICI. In order to study the characteristics of semiconductor laser diodes, it is necessary to solve the Helmholtz wave equation and photon rate equation in addition to the basic semiconductor equations. Also the recombination rates due to the spontaneous and the stimulated emissions should be included, which are very important recombination mechanisms in semiconductor laser diodes. Therefore, we included the solution routines which analyzed the Helmholtz wave equation and the photon rate equation and two important recombination rates to simulate the semiconductor laser diodes. Then we simulated the gain-guiding and index-guiding DH(Double Heterostructure) semiconductor laser diodes to verify the validity of the implemented functions. The results obtained from simulation are well consistent with the previously published ones. This allows us to know the operating characteristics of DH laser diodes and is expected to use as a tool for optimum design.
김형래,곽계달 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.12
This paper represents the lateral first-order mode characteristics for the semiconductor laser diodes using a two-dimensional numerical simulator. In order to analyze the lateral first-order mode characteristics, Helmholtz wave equation is solved twice for the lateral fundamental and the first-order mode considering the mode gain, total losses, and the recombination rate due to the stimulated emission radiation for the each mode independantly. Through this procedure, we find that the lateral first-order mode was easily guided as increasing the stripe width for the index-guiding structures, and that the lateral first-order mode seems to be dominated in the distribution of total light intensity when its output power reaches nearly half of that of the lateral fundamental mode. This results may be used to design the device structure which guides only the lateral fundamental mode.
金炯來 건국대학교 부설 산업기술연구소 1976 논문집 Vol.2 No.-
In this paper the counters and the decoder circuits are designed theoretically and a digital clock is fabricated by using I.C. The digital clock consists of a crystal osciallator, a divider, counters, decoders, 7-segments and etc.. It is found that the time error of the digital clock is less than 30 seconds in a month. It is good agreement with the theory. It is concluded that a digital clock be manufactured not only for getting a excellent accuracy but also for having a good stability.