http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤형도,김성구,허현,윤대원,Yoon, Hyung-Do,Kim, Seong-Ku,Hyu, Hyun,Yoon, Dae-Won 대한전자공학회 1998 電子工學會論文誌, D Vol.d35 No.2
An optical modulator with CPW(coplanar waveguide) electode on Ti:LiNbO$_{3}$ optical waveguide wasfabricated and characterized. The electrical-optical bandwidth measurement showed an optical response of -3dBat 10 GHzand S$_{11}$ lessthan -10dB upto 20GHz. The typeical specifications are : 5.6V of driving voltage, 4.2dB of insertion loss and 30dB of on/off extinction. The eye pattern proved that the optical meduator, fabricated in this work, has properties good enough for application.
윤형도,이한영,구자현,장진현,박종훈,이경식,Yoon, Hyung-Do,Lee, Han-Young,Ku, Ja-Hyon,Chang, Jin-Hyeon,Park, Jong-Hoon,Lee, Kyung-Shik 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.11
온도보상용 광섬유격자필터를 실현하기 위하여 서로다른 열팽창계수를 갖는 두물질을 이용하여 패키징을 한 후 -10도부터 70도 사이에서 온도변화실험을 하였다. 그결과 003nm이하의 파장변화율을 보여 상기온도 범위내에서 일반의 온도보상되지 않는 광섬유 격자에 비하여 약 30배의 온도보상 효과를 보였다. To temperature-compensate the Bragg wavelength of fiber grating filters two materials with different thermal expansion coefficients were depolyed for packaging. After temperature-compensation packaging the maximum difference of the Bragg wavelength in the temperature range of $-10^{\circ}C$ to $70^{\circ}C$ was 0.03nm, which is only about one thirtiety of the Bragg wavelength shift of the temperature-uncompensated fiber grating filter.
x-cut $LiNbO_3$ 광도파로 제작 및 Ti 두께에 따른 Near-field 특성 변 화
김성구,윤형도,윤대원,한상필,김창민,박계춘,이진,유용택,Kim, Seong-Ku,Yoon, Hyung-Do,Yoon, Dae-Won,Han, Sang-Pill,Kim, Chang-Min,Park, Gye-Chun,Lee, Jin,Yoo, Yong-Taek 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.2
The optical near-field patterns, propagation loss and mode sizes of x-cut $Ti:LiNbO_3$ optical waveguide which was fabricated by Ti-diffusion varying with Ti strip thickness in wet oxygen atmosphere were discussed at optical wavelength 1550nm. As Ti thickness increased from $760{\AA}$, the insertion loss of waveguide was decreased. But at Ti thickness $1500{\AA}$, mode sizes are widely broadened. The Ti thickness of below $1100{\AA}$ and above $1500{\AA}$ showed negative effects to propagation loss and fiber coupling. The best Ti thickness for fabricating low propagation loss and good fiber coupling was inferred to be between $1100{\AA}-1500{\AA}$ in our conditions. And for Ti thickness $1150{\AA}$, its propagation loss, horizontal/vertical mode sizes were showed 1.61 dB/cm, $11.9/8.9{\mu}m$ for TM, 0.22 dB/cm, $12.0/9.1{\mu}m$ for TE respectively.
Wet Oxygen 분위기로 제작한 z-cut $Ti;LiNbO_3$도파로 광특성 및 두께에 따른 삽입손실
김성구,윤형도,윤대원,박계춘,정해덕,이진,Kim, Seong-Ku,Yoon, Hyung-Do,Yoon, Dae-Won,Park, Gye-Choon,Chung, Hae-Duck,Lee, JIn 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.10
Ti:LiNbO$_3$ optical waveguides have been fabricated by Ti-diffusion in wet oxygen atmosphere. The fabrication conditions of furnace temperature, diffusion time and bubbler temperature were 105$0^{\circ}C$, 8 hours and 9$0^{\circ}C$, respectively and Ti thickness was varied from 700$\AA$ to 1500$\AA$. In this paper, the nearfield patterns, mode sizes (hirizontal/vertical) and insertion loss of waveguides were discussed at wavelength 1550 nm ad function of Ti thickness. With the planar waveguide, the effective index change and diffusion depth were calculated at 632.8nm using the prism coupling method. From these results, the best Ti thickness in our conditions seems like to by 1200$\AA$~1300$\AA$.
LiNbO$_3$ Mach-Zehnder 간섭기형 CPW(Coplanar waveguide) 광변조기 제작 및 특성비교
김성구,윤형도,윤대원,박계춘,이진,정해덕,Kim, Seong-Ku,Yoon, Hyung-Do,Yoon, Dae-Won,Park, Gye-Choon,Lee, JIn,Chung, Hae-Duck 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.10
In this study, we describe the properties of an electro-optical modulator with CPW(coplanar waveguide) electrode fabricated on $LiNvO_3$ optical waveguide, that is applicable to optical communications. These optical modulators have features that use a buffer layer to reduce velocity mismatch between microwaves and optical wave as well as employ CPW to improve impedance and propagation mode mismatch between the electrode and the external circuits. And an annealed proton exchange technique for obtaining low-loss optical waveguides and good reproducibility was employed. Taking into consideration the mentioned background, to achieve the lower driving voltage of optical modulator, we have re-disigned the longer interaction length. And their device properties are discussed also. As a result, fabricated optical modulators of good 10Gps operation and low voltage(5.6V of the halfwave lengfth voltage) at an $1.5{\mu}m$ wavelength are achived with good reproducibility.