• Title/Summary/Keyword: optical characteristic

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The Study on The Skil Development of Optical CT Using Faraday Effects (Faraday효과를 이용한 광CT 기술 개발 연구)

  • Jeon, Jea-Il;Ahn, Mi-Kyoung;Park, Won-Zoo;Lee, Kwang-Sik;Kim, Jung-Bae;Kim, Min-Soo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.3
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    • pp.109-113
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    • 2004
  • In this paper, we took the basic experiment in order to explore the optical CT(optical current transformer) for measuring high current in a superhigh voltage condition. It is based on the faraday effect that changes the polarization characteristic of optical signals by the magnetic field. We used 1310[nm] laser diode for a light source and comprised a sensing part with the optional fiber of 5[m], 10[m], 20[m] length each. The range of current was from 400[A] to 1300[A]. We observed the characteristic of output that changes according to the length of the optical fiber composing the sensing part. The optical fiber of 5[m] length used for the sensing part had -11.1% of the maximum ratio of error and 10[m] and 20[m] length had -3.5% and 1.7% each. This means that the power and linearity of output increase in proportion to the length of optical fiber and applied current in the same experimental condition.

A Study on the Static Levitation Control of Magnetic Bearing using Optical Fiber Displacement Sensors (광파이버 변위 센서를 적용한 자기베어링 정적 부상 제어 연구)

  • 강종규;신우철;홍준희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.131-136
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    • 2003
  • Five expensive sensors are necessary to control a magnetic bearing system. The sensor price rate of magnetic bearing system is high. So it is necessary that cheap and good sensor is developed. The optical fiber displacement sensor is adaptive to satisfy this condition. We can design magnetically suspended spindle based on static characteristic of optical fiber displacement sensor developed. The controller can be designed by decoupled feedback PD. Therefore, it is simpler than any other controller comparatively.

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Optical Receiver Design For Optical Communication Using Cascoded Amplifier with Inductor Peaking Technique (케스코드 증폭기와 인덕터 피킹기술을 이용한 광통신용 광 수신기의 설계)

  • 박정식;이강승;정윤하
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.305-308
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    • 1999
  • In this paper, a transimpedance optical receiver based on PIN/P-HEMT with cascoded input stage and inductor peaking technique was designed for several giga bits optical communication. Analysis of the receiver shows that cascoded input stage with inductor peaking increase bandwidth without sacrificing low frequence gain. The receiver achieved a low noise characteristic and maximally flat frequence response. It is shown that the 3-dB bandwidth of the designed receiver is 8.3 ㎓ and input equivalent noise current is as low as 16pA/√Hz to 10㎓.

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An Analysis of characteristic response for Optical Directional Coupler with Perturbation Phenomenon (섭동 현상을 갖는 광 방향성 결합기의 응답 특성의 해석)

  • Kim Sun-youb;Park Hyoung-keun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.2
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    • pp.353-359
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    • 2006
  • As for the characteristic of elements for a lot of communication used in light communication systems, it is affected according to structure of directional coupler. We carried out study on a characteristic of the directional coupler which had waveguide structure to have perturbation phenomenon in this paper and ran simulation on the characteristic that we changed structure of directional coupler too, and was got. Confirmation was able to do that it operated with an optical filter, and the directional coupler which added waveguide structure to produce perturbation phenomenon by the results was able to confirm what we adjusted duty ratio of waveguide structure too, and operated with a more excellent optical filter. Through simulation, the case that duty ratio changed than the case that duty ratio of waveguide structure was $50\%$ was able to get an excellent answer characteristic of a -l8dB degree.

Optimal Design of Micro Actuator Plate Spring Considering Vibration Characteristic (진동 특성을 고려한 마이크로 엑추에이터 판 스프링의 최적설계)

  • 이종진;이호철;유정훈
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.220-225
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    • 2003
  • Recent issue of optical actuator is applying to mobile device. It leads actuator to become smaller than conventional type. This paper proposes the design of micro actuator plate spring and analysis of its vibration characteristic. Considering natural frequency of spindle motor, 1st and 2nd eigenfrequency of micro actuator must avoid its natural frequency. First, magnetic circuit is designed by using fine pattern coil and magnetic force is acquired by simulation program. Then, concept design is achieved by topology optimization. From concept design, micro actuator plate spring is embodied through DOE(design of experiment). Finally, considering vibration characteristic simultaneously, optimal plate spring design is determined by RSM(response surface method).

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FEM analysis of Ti:$LiNbO_3$ optical modulator's traveling-wave electrodes and estimation of modulation band-width (Ti:$LiNbO_3$ 진행파 광변조기의 FEM 전극해석 및 대역폭 예측)

  • 김창민;한상필
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.2
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    • pp.96-110
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    • 1995
  • Traveling-wave electrodes for the high-speed Ti:LiNbO$_{3}$ modulators are designed. For a solution to the problems of 1) phase-velocity mismatching between the optical wave and the Modulating M/W, 2) M/W electrode characteristic impedance mismateching, we assume devices with 1$\mu$m thick SiO$_{2}$ buffer layer between the electrode and the Ti:LiNbO$_{3}$ substrate. The electrode analyses are performed by the FEM using the second-order triangular elements. The optimum design parameters to satisfy the phase-velocity matching and the characteristic impedance matching are sought for. By use of the analyses' results, a Mach-Zehnder optical modulator with a CPW electrode is designed as an example. the band-width estimation is also illustrated.

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Design and Analysis of A Mini Linear Optical Pickup Actuator

  • Park, Joon-Hyuk;Baek, Yoon-Su;Park, Young-Pil
    • Journal of Mechanical Science and Technology
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    • v.17 no.11
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    • pp.1616-1627
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    • 2003
  • This paper describes a mini linear optical pickup actuator. To reduce the size, inner yokes are designed to guide the mover and outer yokes of permanent magnets are removed. Magnetic circuit method is used to determine the thrust force. Virtual path method is proposed to analyze the open magnetic circuit analysis. The magnetic circuit of the proposed actuator can be a closed circuit due to the virtual path model of the outer magnetic flux. The validity of virtual path method is evaluated by comparing to the FEM analysis. Structural vibration is investigated using FEM and the design of the mover is modified to improve the vibration characteristic. Dynamic characteristic experiments shows that the performance of the proposed actuator is enough to be used as a coarse and fine seeking actuator simultaneously and the thrust force margin for loading a focusing actuator is guaranteed.

A Study of Grinding Characteristic of Ferrule (페룰의 연삭 가공 특성에 관한 연구)

  • Lee, S.W.;Choi, H.Z.;Choi, Y.J.;Ahn, G.J.
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.974-979
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    • 2003
  • As recently optical communication industry is developed, request of optical communication part is increased. Ferrule is very important part which determines transmission efficiency and quality of information in the optical communication part. Most of ferrule processes are grinding which request high processing precision. Particularly, concentricity and cylindricity of inner and outer diameter is very important. The co-axle grinding process of ferrule is to make its concentricity all of uniform before centerless grinding. Surface integrity of ferrule is affected by kind of grinding wheels, grinding conditions, and characteristic of workpiece and equipment. In this study, surface integrity of workpiece according to change of grinding wheel speed, feed rate, regulating wheel speed and grinding force is investigate to improve the concentricity and roundness of ferrule from many experiments.

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Optical Properties of Semiconductors Depending on the Contact Characteristic Between Different Groups (이종 물질의 접합계면에 의한 반도체 물질의 광학적 특성)

  • Oh, Teresa;Nho, Jong Ku
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.2
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    • pp.71-75
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    • 2014
  • To observe the optical characteristic of oxide semiconductor depending on the degree of bonding structures, SiOC, ZnO and IGZO were prepared by the RF magnetron sputter system and chemical vapor deposition. Generally, crystal ZnO, amorphous SiOC and IGZO changed the optical characteristics in according to the electro-chemical behavior due to the oxygen vacancy at an interface between different groups. Transmittance of SiOC and IGZO with amorphous structures was higher than that of ZnO with crystal structure, because of lowering the carrier concentration due to the recombination of electron and holes carriers as oxygen vacancies. Besides, the energy gap of amorphous SiOC and IGZO was higher than the energy gap of crystal ZnO. The diffusion mobility of holes is higher than the drift mobility of electrons.

The Dynamic and Machining Characteristics of Co-axial Grinding Machining System (동축 가공 연삭시스템의 운동 및 가공 특성)

  • Kim G.H.;Lee S.W.;Choi H.Z.;Choi Y.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.608-611
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    • 2005
  • As the optical communication industry is developed, the demand of optical communication part is increasing. $ZrO_2$ ceramic ferrule is very important part which can determines the transmission efficiency and information quality to connect the optical fibers. In general $ZrO_2$ ceramic ferrule is manufactured by grinding process because the demands precision is very high. For the precision grinding machining, it is very important that the error of feeding system is improved. Therefore, we estimated the dynamic characteristics in feeding system of ultra precision co-axial grinding machining system. Then, we performed the machining characteristics experiment.

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