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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Optics and Photonics
Journal Basic Information
Journal DOI :
Optical Society of Korea
Editor in Chief :
Volume & Issues
Volume 9, Issue 6 - Dec 1998
Volume 9, Issue 5 - Oct 1998
Volume 9, Issue 4 - Aug 1998
Volume 9, Issue 3 - Jun 1998
Volume 9, Issue 2 - Apr 1998
Volume 9, Issue 1 - Feb 1998
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Scanning confocal microscope of a surface following effect using a quad-detector
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 1~4
A compact scanning confocal microscope has been constructed using a quad-detector in a CD-player. The variation of error signal on depth which obtained by a quad-detector is used in the scanning confocal microscope. Bipolar error signals, which is sensitive near a focus, give a surface following effect whiout following the surface. In the case of small depth difference, the difference of materials through the reflection signal has been identified. The image which uses reflection signal only, has been obtained with the same setup. And, the results obtained in two different way were compared and analyzed.
Elimination of the Fabry-Perot effect in a
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 5~8
In calculating the light propagation in inhomogeneous uniaxial materials by using a conventional
matrix method, Fabry-Perot effect is caused by inherent multiple internal reflections at interfaces for monochromatic light source. In this paper we propose an apodization method by which we can eliminate in negligible time the interference fringe in the
matrix optics. For a cell with k abrupt interfaces, the new apodization method can be implemented simply by, at maximum, (k+1) addtional
matrix multiplications in calculating the complete transfer matrix of the cell.
Determination of the absolute order of moire fringes of moire shadow topography with a criss crossed grating
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 9~14
We present a simple method of determining the absolute order of moire fringes formed by the moire shadow topography with a criss-crossed grating. Two experimental methods in this topography are proposed and demonstrated; one is to change the ratio of x and y pitches in a criss-crossed grating after fixing the position of a light source and a camera, and the other is to change the position of a light source and a camera after fixing the ratio of x and y pitches in a criss-crossed grating.
A novel method to improve SNR of the spectrum-sliced incoherent light source using the four-wave mixing in a dispersion-shifted fiber
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 15~19
We have present an all-optical technique to significantly reduce the dispersion penalty of a spectrum-sliced channel in high-speed and long-distance transmissions. We have reduced the necessary optical bandwidth for the 2.5 Gb/s incoherent light transmission down to 0.1 nm by expanding the optical bandwidth of a received signal. The optical bandwidth expansion was realized using the intra-channel fiber four-wave mixing at the receiver resulting in an improvement of th signal-to-noise ratio of the received light channel. We have successfully demonstrated the transmission of a 2.5 Gb/s NRZ signal with the 0.1 nm bandwidth over a 300 km dispersion-shifted fiber. An error floor occurs at
BER without the optical bandwidth expansion. With the optical bandwidth expansion, however, the error floor decreases to less than
. The transmission penalty was less than 0.5 dB at
BER. To our knowledge, the optical bandwidth of 0.1 nm used in our experiment is the narrowest optical bandwidth reported so far.
Measurement of linear dispersion of optical fibers in zero-dispersion wavelength region
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 20~24
Fiber four-wave mixing(FWM) in zero-dispersion wavelength region is studied. FWM efficiency of -26 dBm and bandwidth of 2nm are measured. The linear dispersion slope in zero-dispersion wavelength region is calculated from the modulation behavior of FWM efficiency.
Optical interconnections by use of mode speckle patterns of a multimode fiber
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 25~30
In this paper, a simple scheme of optical interconnections between M input and N output terminals using mode speckle patterns generated in the mulitmode optical fiber is described. It is shown that fully parallel nonblocking interconnections are accomplished by using properly generated mode speckle patterns as destination codes and dectecting the generated mode speckle patterns separately using M multiplexed Vander Lugt matched filters at each output terminal. The orthogonality condition of mode speckle patterns is investigated by either changing the launching angles or rotating the polarization direction of the beam. Preliminary experiments by use of a 4
4 graded refractive-index multimode fiber coupler whose core diameter was 50
were performed to show the feasibility of our scheme.
Holographic recordings in acrylamide photopolymer
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 31~37
We fabricated acrylamie photopolymer holographic recording materials by photopolymerization of acrylamide, and described hologram formation process. Light absorption and phtobleaching process by MB(methylene blue) dye and radical polymerization process due to TEA(triethanolamind) are explained in detail. We adopted the Beer-lambert law in order to explain the photobleaching kinetics. Dependencies of diffraction efficiency of the hologram on monomer amout and the exposure are investigated. The scattering effect caused by grain of polymer crystal, and fixing method are also illustrated.
Color reproduction algorithm considering background effect on a CRT display
Korean Journal of Optics and Photonics, volume 9, issue 1, 1998, Pages 38~46
In this study, the color reproduction algorithm considering both of luminace and chromaticity of the background light is presented and tested to BT-H 1450 monitor(Panasonic). In the case of neglecting the background effect, the Macbeth ColorChecker's 24 colors are reproduced with the average color difference
more than 9.0. By using this method, the average color difference
is decreased less than 1.0. From this study, we can find that both of luminance and chromaticity of background light are very important factors in the color reproduction on a CRT display.