• Journal of the Korean Professional Engineers Association
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• v.13 no.3
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• pp.53-56
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• 1980

• The Monthly Technology and Standards
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• s.33
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• pp.53-60
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.316-317
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• 2003

오늘날 광 통신망이 지향하는 바는 ‘고속화’, ‘대용량화’, 그리고 ‘장거리화’의 3가지로 집약할 수 있다. 1990년대 후반에 본격적으로 도입된 WDM(Wavelength Division Multiplexing) 기술은 하나의 광섬유에 파장이 다른 다수의 광 채널 신호를 동시에 전송할 수 있는 기술로서, 별도의 광섬유를 포설하지 않고도 광통신망의 용량을 경제적으로 신속히 확장할 수 있기 때문에 대용량화를 위한 대표적인 기술로 자리 잡았다. (중략)

• Science of Emotion and Sensibility
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• v.15 no.4
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• pp.469-476
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• 2012

The purpose of this study is to derive design guideline for logo design development of smart clothing using flexible plastic optical fiber. In a criterion of guideline derivation for logo design, the first, it is a question of whether it indicates an appropriate degree of brightness across the front of flexible plastic optical fiber. The second, it is a question of whether it indicates relatively an uniform brightness characteristic across the front of flexible plastic optical fiber. For this, the brightness characteristic of flexible plastic optical fiber according to the angle changes and the length of flexible plastic optical fiber was analyzed by the 'Experiment 1'. To deduce guideline for the logo design of the actual garment, the brightness characteristic of flexible plastic optical fiber about the main morpheme of the capital letter of alphabet was analyzed by the 'Experiment 2'. Based on the results of the two experiment, this study derived design guideline and limitations for logo design of smart clothing visualized by the flexible plastic optical fiber.

• Korean Journal of Optics and Photonics
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• v.23 no.4
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• pp.135-142
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• 2012

We have developed a measurement method of the refractive index profile of an optical fiber by using diffraction phase microscopy. In the microscope system, the reference light was extracted directly from the probe light that passed through the sample by means of pinhole filtering with a diffraction grating. The spatial interference pattern produced by the probe light and the reference light was processed to generate the phase image of the sample fiber. The index profile was obtained by the inverse Abel transform of the phase profile. In order to remove the background phase that originated from the index difference between the cladding and the surrounding medium, the background phase was calculated from the phase data of the cladding to make a core phase profile that can be directly transformed to the index profile of the core without the full phase image that includes the entire cladding part.

• Korean Journal of Optics and Photonics
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• v.21 no.1
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• pp.12-15
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• 2010

In this paper, we have proposed and demonstrated a simple fiber-optic temperature sensor based on the bending loss of a TEC(thermally expended core) fiber attached to a bi-metal. The deformation of the bi-metal caused by the change in its temperature induces the bending loss of the TEC fiber. The experimental result shows that the temperature sensitivity and operation temperature range of the device are controllable through the adjustment of the structure of the expanded core fiber. The fabrication procedure of the device is described in detail.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.4C
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• pp.430-436
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• 2009

In this paper, we propose and describe our implementation of an automatic control system for the center wavelength of a fiber Bragg grating. The proposed system consists of a Fabry-Perot filter and cantilever structure controlled by a step motor interfacing computer. We consider the change of the center wavelength and the reflective spectrum shape for a given FBG according to the translation distance of the push stick and the cantilever thickness variation. The proposed system can control the center wavelength of a FBG with a resolution of 0.01 nm by applying compression or extension to the FBG. The proposed system has characteristics that keep the desired wavelength of the FBG with a variation of environmental conditions.

• Ceramist
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• v.5 no.1
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• pp.45-45
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• 2002

• 지반과기술
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• v.6 no.2
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• pp.71-71
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• 2009

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.5
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• pp.1730-1734
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• 2010

Generally, a pH value of secondary water in a nuclear power plant should be estimated after sampling and cooling down. In this process, the measurement of temperature is very important because a pH value is varied according to the temperature of secondary water. In this study, a noncontact fiber-optic temperature sensor using a silver halide optical fiber is fabricated to measure the temperature of cooled secondary water. And we have measured an infrared radiation, which is transferred by a silver halide optical fiber from a heat source, using a thermopile sensor. The relationships between the temperature of a heat source and the output voltage of the fiber-optic temperature sensor according to the change of distance and angle are determined. The measurable temperature range of the fiber-optic temperature sensor is from 25 to $60^{\circ}C$. Based on the results of this study, a noncontact temperature sensor using a silver halide optical fiber can be developed for the temperature measurement of the pH sample in the secondary water system.