• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.52-53
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• 2002

파장분할 다중화 광통신 선로 상에서, 특정 파장 채널을 임의로 선택하여 분리/첨가 할 수 있는 동적파장가감기(wavelength-division dynamic optical add-drop multiplexer)는 광 네트워크의 효율을 높이는데 핵심 소자라 할 수 있다. 지난 수년간 개발된 수많은 기술들 중에서, LiNbO$_3$ 광도파로 음향광학소자(acousto-optic tunable filter： AOTF)는 몇 가지의 특징적인 장점들을 보여줬는데, 예를 들면 넓은 영역의 파장 선택성, 짧은 스위칭 시간, 다중 채널 동작 가능성 등이다. (중략)

• Korean Journal of Optics and Photonics
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• v.10 no.5
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• pp.401-404
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• 1999

We have developed a direct measurement method for gain coefficients of erbium-doped fiber amplifiers and used the coefficients for the design of flat gain EDFAs. Another simple method of designing EDFAs for WDM was realized as an application of inversion principle.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1999.11a
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• pp.80-84
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• 1999

Sunlight Collector System is a new way to make sunlight available to living things. It transmits sunlight through fiber optics to wherever is needs. It applies the artificial lighting, underground lighting, intelligent building, museum lighting, restoration-room to health etc. Cutting out most of the ultra-violet and intra-red radiation. In this paper, we measured the spectrum analysis of sunlight and Sunlight collector System's light. Also, we found out the distance to get visible light.

• Proceedings of the Optical Society of Korea Conference
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• 2008.07a
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• pp.71-72
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• 2008

We review and report our analytical results in the technology front of optical industry in Japan as optical $recording^{1)}$, semiconductor $stepper^{2)}$, fiber communication, digital $camera^{4)}$ and $OCT^{5)}$ which are contributing to the improvement of people's higher quality of life and to the industrial economical growth from the aspects of the University, Industry and Government collaborations including international comparison to enhance the progress of sustainable global photonic innovation eco-systems. In the following part, some statistics of remarkable economical growth in east Asia and the global warming issue will be mentioned.

• Korean Journal of Optics and Photonics
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• v.11 no.3
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• pp.163-165
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• 2000

We propose a new structure of optical cross connect based on a WDM MUX/DEMUX pair and switchable mirrors. In experiment, we demonstrate the operation of the optical cross connect using an optical fiber loop mirror connected to a $2\times2$ optical switch as a switchable mirror.mirror.

• Korean Journal of Optics and Photonics
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• v.1 no.1
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• pp.107-113
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• 1990

Characteristics and applications of three major types of lasers are discussed. They are chemical-metabolic, thermal destructive, and nonthermal mechanical lasers. The thermal destructive lasers ($CO_2$, Argon, and Nd:YAG) are especially explained in detail with regard to energy density, wavelength, fluence, stage of thermal destruction, and advantages of laser surgery. Excimer and Q-swiched lasers are discussed as nonthermal mechanical ones. Delivery system, optical fiber and articulated arm, is also discussed. Finally, recent advancements of medical laser are included in the conclusion.

• Journal of the Optical Society of Korea
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• v.12 no.4
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• pp.364-364
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• 2008

• Current Optics and Photonics
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• v.3 no.3
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• pp.193-198
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• 2019

We propose a novel method to design a dispersion map for a WDM (Wavelength Division Multiplexing) ring network with the capability of wavelength reconfiguration. The method is simple, but gives us an optimum set of DCMs (Dispersion Compensation Modules) which satisfies a given value of the tolerable residual dispersion. The proposed method does not depend on compensation method, fiber type, or modulation format. We also demonstrate numerically how it works with an example 10-node ring network.

• Korean Journal of Optics and Photonics
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• v.10 no.1
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• pp.68-72
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• 1999

We demonstrate a new pulse characterization scheme relying on self-heterodyning that uses intracavity frequency shifter in a fiber soliton laser with frequency shifted feedback. By heterodyning the frequency-shifted pulse stream with the unshifted one, and by measuring the beat strength with varying the delay length between two pulse streams, we obtain the amplitude autocorrelation function from which we estimate the pulsewidth. The result is in good agreement with that obtained by the autocorrelation relying on the second harmonic generation.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.1465-1467
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• 2004

Compared with other transport means, safety and timeliness are the merits of railways. Unexpectedly when accident happens, much time and human strength are required to cope with the accident. And for swift recovery, systematic rehabilitation is needed. Recently using MTS(Moving picture Transmission System), we can perform accident rehabilitation and recording work efficiently. MTS is the device that transmits continuous picture information from accident field to control center. e are developing the appropriate system to railway situation to make use of the existing information communication technology, processing technology of video-tex, super high speed transmission technology through fiber-optic, copper cable and network description of information Technology, etc. If these communication-based can technologies are applied to railway system, railway managers can control the accident by inspecting the picture of accident field and can contribute to the safe train operation and the improvement of railway management. In this paper, we investigate the connecting methods when optical fiber is used for moving picture data transmission of train accidents, and its problems. And, we validate MTS's performance through about 28km section of field test.