• Proceedings of the Optical Society of Korea Conference
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• 2001.08a
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• pp.244-245
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• 2001

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.54 no.2
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• pp.55-62
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• 2005

The optical CT was developed to use twisted fibers for 170 kV GIS. The fiber sensor optimized on the optical CT was wound 3 turns and twisted 4 times per a turn at the pipe with a diameter of 130 mm. The measurement error for the linearity which was satisfied the criterion of 'IEC Class-1.0' was less than ± 0.44 % at the transmission type and ± 0.82 % at the reflection type to 2,000 A. At a low current to 200 A, the measurement error was ± 0.69% at the transmission type and ± 1.38 % at the reflection type.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.25 no.2
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• pp.35-41
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• 2002

This paper describes an automatic transplantation machine of optical fiber controlled by PLC. The transplantation operations is a key operation for the optical fiber application products, such as bag, cap, and others. To transplant 200∼500 optical fibers, there are many recurrent manual operation needed with conventional process. In this paper. we propose an automatic machine that reduce transplanting time and enhance product quality. Developed machine includes transplantation, heat cutting and ultraviolet coating operation. Also proposed Machine is controlled by PLC to adjust operation parameters such as pulling length, cycle time, coating time and others. Developed Machine has been applied in the field and found to be a useful system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.2
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• pp.89-93
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• 2002

PbO contained multicomponent glass and fibers have been obtained by melting process and double crucible method. PbO containing glass is most promising for fabrication of high-numerical aperture optical fiber. In this study, main composition is $SiO_2$, PbO and glass composition mix component oxide such as $K_2O$, $Na_2O$, $B_2O_3$, $A1_2O_3$. Also, the optical, mechanical and structural properties of manufactured fibers by double crucible method are investigated.

• Journal of the Optical Society of Korea
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• v.7 no.4
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• pp.258-263
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• 2003

Simple algebraic expressions are derived to approximate the optimal input RMS pulse width and the resulting output RMS pulse width in single-mode fibers. The results are compared with the previously published methods and with numerical results by the split-step Fourier method. In addition, for a transform-limited Gaussian input pulse, it is shown that there is no optimum input pulse width to minimize the output spectrum width. Finally, with fiber nonlinearity, it is shown mathematically that there is not an optimum input pulse width to minimize the product,${\sigma}_t{\sigma}_{\omega}$, which is inversely proportional to the transmission capacity of WDM systems.

• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.495-496
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• 2009

• Journal of the Optical Society of Korea
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• v.1 no.2
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• pp.81-89
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• 1997

The formation of phase singularities in optical fibers is theoretically and experimentally investigated. In particular, their structural characteristics and properties are discussed in relation to guided mode patterns. It is found that except for the fundamental linearly polarized(LP) modes, all the mixed modes displayed phase singularities in the transverse plane. The results in the few mode fiber show that superposition of the LP even and odd modes produces isolated dark points and phase singularities. Phase singularities are found to be of the screw type and of first order. The number of phase singularities linearly increases with the number of guided modes.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.3
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• pp.15-19
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• 2004

We presented the holographic memory system using a multi-mode optical fiber. In this system, we multiplexed multiple holograms using the lights from multi-mode optical fibers as reference beams. The proposed system has two degrees of multiplexing freedom: speckle pattern of light coming from multi-mode fiber and spatial location of multi-mode fibers. Therefore, the data addressing in the system can be performed by mode and spatial multiplexings.

• Journal of the Optical Society of Korea
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• v.15 no.2
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• pp.128-131
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• 2011

After the successful extension of the rotating planar waveguide model to Wave Optics, where a clear identification between the angular velocity of one hypothetical waveguide and the phase differences between two points on the path of one bounded mode was found, an application of the model to explain the interference theory is presented. We demonstrate that, for two bounded modes to create an interference pattern, a constrain to the relative parameters among both is imposed by the fiber optics. This result, not reported in the literature up to date, provides a new horizon to understand the interaction light-light when propagated within optical fibers.

• JOURNAL OF ELECTRICAL WORLD
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• no.12 s.72
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• pp.24-27
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• 1982