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초음파 분무 열분해법에 의한 TiO2 및 BaTiO3 분말의 제조
김덕준,김환,Kim, D.J.,Kim, H. 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.5
Fine TiO2 and BaTiO3 powders having spherical particles were synthesized by ultrasonic spray pyrolysis of alcoholic solution of metal alkoxide in an electric furnace heated at 400-90$0^{\circ}C$. Microstructure and composition of particles synthesized were observed by TEM and XRD respectively. Spectific surface area of powders synthesized was examined through BET specific surface area measurement. TEM observation revealed that the particle size did not change irrespective of pyrolysis temperature but decreased according to the increase of concentration and spherical particle was consisted of primary particles of about 0.02${\mu}{\textrm}{m}$. As for BaTiO3 powder, the ratio of Ti/Ba was 0.987 by EDX analysis.
김호성,김덕준,김동철,고영호,김갑중,안신모,한원석,Kim, H.S.,Kim, D.J.,Kim, D.C.,Ko, Y.H.,Kim, K.J.,An, S.M.,Han, W.S. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.3
Two main technologies of III-V/Si laser diode for optical communication, direct epitaxial growth, and wafer bonding were studied. Until now, the wafer bonding has been vigorously studied and seems promising for the ideal III-V/Si laser. However, the wafer bonding process is still complicated and has a limit of mass production. The development of a concise and innovative integration method for silicon photonics is urgent. In the future, the demand for high-speed data processing and energy saving, as well as ultra-high density integration, will increase. Therefore, the study for the hetero-junction, which is that the III-V compound semiconductor is directly grown on Si semiconductor can overcome the current limitations and may be the goal for the ideal III-V/Si laser diode.
권용환,김덕준,김종회,최중선,윤천주,최광성,남은수,Kwon, Y.H.,Kim, D.J.,Kim, J.H.,Choe, J.S.,Youn, C.J.,Choi, K.S.,Nam, E.S. 한국전자통신연구원 2010 전자통신동향분석 Vol.25 No.5
최근의 코히어런트 광통선 기술의 발전에 힘있어, 차세대 대용량 광통신 분야에 있어서 기술혁신이 이루어지고 있다, 코히어런트 광통신 기술은 100Gbps급의 전송망에서 표준으로 채택되었을 뿐만 아니라, 그 이상의 속도를 가지는 광통신망을 실현할 유일한 대안으로 그 중요성이 더해 갈 것으로 전망된다. 본 고에서는 그 중에서 직교위상변조기, 편광변환기, 편광분리기, 광하이브리드 및 밸런스 광검출기 등의 핵심 광부품기술의 현황 및 전망에 대해서 기술하였다.
김종회,한영탁,김덕준,김동철,최중선,이동훈,이서영,Kim, J.H.,Han, Y.T.,Kim, D.J.,Kim, D.C.,Choe, J.S.,Lee, D.H.,Lee, S.Y. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.5
The data rate for transmission through fiber-optic cables has increased to 400 Gbps in single-wavelength channels. However, speeds up to 1 Tbps are required now to meet the ever-increasing bandwidth demand driven by the diverse requirements of contemporary applications for high-quality on-demand video streaming, cloud services, various social media, and emerging 5G-enabled applications. Because the data rates of the per-channel optical interfaces depend strongly on the operational speed of the optoelectronic devices used in optical transceivers, ultrahigh-speed photonic devices and components, and eventually, chip-level transmitter and receiver technologies, are essentially required to realize futuristic optical transceivers with data rates of 1 Tbps and beyond. In this paper, we review the recent progress achieved in high-speed optoelectronic devices, such as laser diodes, optical modulators, photodiodes, and the transmitter-receiver optical subassembly for optical transceivers in data centers and in metro/long-haul transmission.
한영탁,이동훈,김덕준,신장욱,이서영,윤석준,백용순,Han, Y.T.,Lee, D.H.,Kim, D.J.,Shin, J.U.,Lee, S.Y.,Yun, S.J.,Baek, Y. 한국전자통신연구원 2022 전자통신동향분석 Vol.37 No.2
Intra- and inter- datacenter data traffic is rapidly increasing due to the spread of smart devices, cloud computing, and non-face-to-face services. Recently, 400-Gbps optical transceivers based on 100-Gbps/channel have been released primarily by major overseas companies. Various solutions for next-generation datacenter interconnect are being proposed by international standardization and multiple source agreement groups. Following this trend, ETRI has developed a 400-Gbps optical transmission/reception engine using 100-Gbps/channel light sources and photodetectors as well as a silica-based AWG. In the future, technologies of optical devices and components for intra-datacenter communication are expected to be developed based on a data rate of 200-Gbps/channel. Thus, 1.6-Tbps class optical transceivers will be released.
김약연(Y. Y. Kim),한진우(G. W. Han),한기평(G. P. Han),김덕준(D. J. Kim),이상석(S. S. Lee),최태구(T. G. Choi) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.1
The effective linewidth was measured using the conventional cavity perturbation method at 9.43 ㎓ in room temperature for Ca-Zr substituted yttrium iron garnet plate. The experimental set-up consists of the network analyzer, the electromagnet and the cylimdrical TE011 cavity. Measurement was performed in the static magnetic field perpendicular to the sample plane. The real and imaginary parts of diagonal component of the microwave susceptibility tensor are obtained from the resonance frequency and the quality factor Q of the cavity. Variations of the effective linewidth was qualitatively explained with the spin wave scattering theory.