• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2003.10a
• /
• pp.249-249
• /
• 2003

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.05a
• /
• pp.121-121
• /
• 2004

최근 급속히 성장하고 있는 광통신산업의 발전에 있어서 주목할 만한 경향 중에 하나는 제품의 소형화 및 집적화라 할 것이다. 마이크로 광모듈 접속/조립 시스템은 광모듈을 소형화하고 고기능성 광통신 부품의 개발에 있어 가장 필요한 장비이다. 이에 본 연구에서는 초소형 광모듈 접속/조립 시스템을 개발하기 위하여 두께가 약 30 $\mu\textrm{m}$인 박막형 필터와 렌즈일체형 파이버를 접속/조립할 수 있는 시스템을 개발 및 초소형 광통신용 1$\times$1 OADM(Optical Add/Drop Module) 모듈을 제작하였다.(중략)

• Journal of the Korean Society for Precision Engineering
• /
• v.21 no.9
• /
• pp.111-118
• /
• 2004

The automatic assembly system of micro optical filter is a key technology in the development of optical modules with high functionality. In order to develop an automatic assembly system of optical fiber and filter, we have firstly developed the system and program capable of characterization of 30${\mu}m$-thick film filters as well as conventional optical filters. Moreover, we have carried out the characterization of optical filter using the developed system and program, and compared experimental results with by conventional handwork. The measurement of optical filters using the present system is faster, more precise and more reliable than those based on the conventional handwork.

• Korean Journal of Optics and Photonics
• /
• v.14 no.3
• /
• pp.306-311
• /
• 2003

In this paper, we modeled the incident beam in order to analyze and evaluate the optical thin film device for wavelength division multiplexing in optical telecommunication network. As applied ray tracing method to the optical path, we were compared the accuracy of coupling efficiency simulated by two modeling methods. In the results of sinulation, ceil modeling method was preferred to annual modeling method in micro-optic device because of accuracy for coupling efficiency and Gaussian intensity distribution. In the results of optimal simulation for optical device using thin film filter, the distance (d1) between optical fiber and GRIN lens, the distance (d2) between GRIN lens and thin film filter and the coupling efficiency were 0.24 mm, 0.25 mm and -0.11 ㏈ respectively. As d2 was displaced at 0.25 mm and d1 was varied in order to evaluate the optimal value, d1 and maximum coupling efficiency were 0.24 mm and -0.35㏈, respectively. Then the results of experiment were corresponded to that of optimal simulation by cell modeling and it was possible to analyze the performance for optical device using thin film filter by the simulation.

• Proceedings of the Optical Society of Korea Conference
• /
• 1995.06a
• /
• pp.84-93
• /
• 1995

간섭필터 제작시 고굴절률 박막으로 많이 사용되는 TiO2 박막을 이온빔 보조증착 방법으로 제작하여 광학적, 기계적 특성을 연구하였다. 보조증착용 이온초으로는 End-Hall 형 이온총을 자체제작하여 사용하였다. 증착속도, 이온빔의 전류빌도, 산소 주입량 등을 주요 증착변수로 하여 TiO2 박막의 광학상수와, 기계적 성질에 미치는 영향을 조사하였다. 그 결과 박막의 조밀도와 굴절률이 증가하여, 대기중에 노출시 파장이동이 없는 고품질의 간섭필터 제작에 사용할 수 있음을 알 수 있었다.

• Korean Journal of Optics and Photonics
• /
• v.21 no.4
• /
• pp.175-178
• /
• 2010

A transmission type color filter based on a thin film Ag-$SiO_2$-Ag etalon was proposed and realized in a quartz substrate. The device could acquire infrared suppressed transmission and wide effective area compared to costly e-beam lithography and laser interference lithography. The FDTD method was introduced to take into account the effect of the dispersion characteristics of the silver metal and the thickness thereof. Three different color filters were devised: The cavity length for the red, green and blue filters were 160 nm, 130 nm, and 100 nm respectively, with the metal layer unchanged at 25 nm. The observed center wavelengths were measured at 650 nm, 555 nm, and 480 nm for the red, green, and blue devices; the corresponding bandwidths were about 120 nm, 100 nm, and 120 nm; and the peak transmission for all was ~60%. Finally the relative transmission was measured to decline with the angle of the incident beam with the rate of 1%/degree.

• Proceedings of the KIEE Conference
• /
• 2000.11c
• /
• pp.500-502
• /
• 2000

고온 초전도 YBCO 박막을 Nd:YAG 레이저를 이용하여 MgO 기판에 증착시켰다. 박막을 마이크로스트립형 통신소자로 제작하기 위해 포토리스그래피 방법으로 습식 에칭을 시켰다. 제작된 박막에 접지면을 입히기 위해 스퍼터링 방식으로 Ti 충을 30 nm 증착하고, 열 증발기로 Ag를 $2{\mu}m$ 정도로 증착을 시켰다. 소자의 주파수 응답을 측정하기 위해 캐비티를 제작하여 측정하였다. 제작된 필터의 중심 주파수는 14 GHz이다. 박막을 냉각시켜며 그 중심 주파수를 측정하여 임계 온도를 측정할 수 있었다. 필터는 두 가지 디자인을 이용하였으며, 임계 온도에서의 중심주파수가 일정하게 이동함을 관찰할 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.10a
• /
• pp.630-632
• /
• 2003

In this paper, we present the fabrication and performance of FBAR filters with ladder and stacked crystal filter (SCF) types. The structure of the unit resonator in our work is the solidly mounted resonator (SMR) with W/SiO$_2$ multi-layer reflectors, the return loss of of which show -24dB at resonant frequency of -2.0GHz. The $K^2$eff, Q$_{s}$, and Q$_{p}$, indicating the performance of resonator were 3.24%, 6,363 and 6,749 and were calculated for the resonator with the resonance area of 21200${\mu}{\textrm}{m}$$^2$. Based on this unit resonator, FBAR filters with ladder and SCF types were fabricated and compared. The sizes of filters were 800$\times$2000(${\mu}{\textrm}{m}$$^2$) for the ladder type and 600$\times$500(${\mu}{\textrm}{m}$$^2$) for the SCF type.e..

• 연구논문집
• /
• s.33
• /
• pp.111-122
• /
• 2003

The automatic assembly system of micro optical filter is a key technology in the development of optical modules with high functionality. In order to create such automatic assembly system of optical filter, we have developed the system and program capable of evaluation of $30\mum$-thick film optical filter as well as conventional optical filters performances. Moreover, we have carried out the evaluation of optical filter using developed system and program, and we have compared and analyzed them with by conventional hand work. As results, the measured performances based on the present system are more fast, precise and reliable then those of the conventional hand work. In addition to that, the system can apply for various optical collimators and filters.

• Journal of the Korean Ceramic Society
• /
• v.40 no.6
• /
• pp.547-552
• /
• 2003

ZnO thin films on glass substrate were deposited by RF magnetron reactive sputtering at 100 W, 1.33 Pa, Ar/O2=50 : 50, 200$^{\circ}C$, and a target/substrate distance of 4 cm. Crystallinities, surface morphologies, chemical compositions, and electrical properties of the films were investigated by XRD, SEM, AFM, RBS, and electrometer. All films showed a strong preferred c-axis orientation and the chemical stoichiometry. The propagation velocity of ZnO/IDT/glass of single electrode and double electrode types SAW filter was about 2,589 m/sec, 2,533 m/sec and insertion loss was a minimum value of about -11 dB and -21 dB, respectively.