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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 24, Issue 6 - Dec 2013
Volume 24, Issue 5 - Oct 2013
Volume 24, Issue 4 - Aug 2013
Volume 24, Issue 3 - Jun 2013
Volume 24, Issue 2 - Apr 2013
Volume 24, Issue 1 - Feb 2013
Selecting the target year
Optical Components for High Speed Optical Communications
Baek, Yongsoon ;
Korean Journal of Optics and Photonics, volume 24, issue 6, 2013, Pages 297~310
DOI : 10.3807/KJOP.2013.24.6.297
With the explosive growth of internet data traffic due to the FTTH penetration, prevalence of smart devices and cloud network service, the demand for higher bandwidth is ever increasing with the pace of more than 40% annual growth. To accommodate ultra high bandwidth traffic, optical components in each hierarchy have progressed rapidly. WDM has begun to be deployed along with higher bandwidth service in the access network. Next-generation ROADM is under development for efficient network management in the metro network. For long-haul transmission, an advanced modulation scheme based on coherent transmission technology has been adopted to enhance spectral efficiency. In this paper, core components to meet the demands of high speed, high efficiency and low power consumption will be reviewed.
Optical Structural Design using Gaussian Optics for Multiscale Gigapixel Camera
Rim, Cheon-Seog ;
Korean Journal of Optics and Photonics, volume 24, issue 6, 2013, Pages 311~317
DOI : 10.3807/KJOP.2013.24.6.311
It was reported in Nature and the Wall Street Journal on June 20th, 2012 that scientists at Duke university have developed a gigapixel camera, capable of over 1,000 times the resolution of a normal camera. According to the reports, this super-resolution camera was motivated by the need of US military authorities to surveil ground and sky. We notice the ripple effect of this technology has spread into the area of national defense and industry, so that this research has started to realize the super-resolution camera as a frontier research topic. As a result, we can understand the optical structure of a super-resolution camera's lens system to be composed of a front, monocentric objective of a single lens plus 98 rear, multiscale camera lenses. We can also obtain the numerical ranges of specification factors related to the optical structure, such as the diameter of the aperture, and the focal length.
Aspheric Lens Measurements by Digital Holographic Microscopy and Liquid
Kim, Doocheol ; Shin, Sanghoon ; Yu, Younghun ;
Korean Journal of Optics and Photonics, volume 24, issue 6, 2013, Pages 318~323
DOI : 10.3807/KJOP.2013.24.6.318
Digital holographic microscopy allows optical path difference measurement. Optical path difference depends on both the refractive index and the morphology of the sample. When interference fringes are very closely spaced, the phase data contain high frequencies where
ambiguities cannot be resolved. The immersion testing method, which is a transmission test while the sample is immersed in liquid, is very effective in reducing high frequency fringes in transmission measurements so that large dynamic range testing is possible for a non-null configuration. We developed a digital holographic microscope using liquid that can measure the high numerical aperture aspheric morphology of a sample. This system provides highly precise three-dimensional information on the sample. By improving the experimental method, choosing liquids which have similar refractive index to the sample, we can measure more accurate three-dimensional information on the samples.
Measurement of Wafer Deformation using Deflectometry
Lee, Hodong ; Shin, Sanghoon ; Yu, Younghun ;
Korean Journal of Optics and Photonics, volume 24, issue 6, 2013, Pages 324~330
DOI : 10.3807/KJOP.2013.24.6.324
Phase-measuring deflectometry is a full-field gradient measuring technique that lends itself very well to testing specular optical surfaces. We have measured deformation of a large specular surface by deflectometry. In this work, we have used a Fourier-transform method to get the phase from a measured deformed fringe pattern, and we have used least squares method to obtain the height information of the specular surface from the calculated slope. Experimentally, we have confirmed that deflectometry can be used for deformation measurement of a specular surface like that of a wafer.
Measurement of Large Mirror Surface using a Laser Tracker
Jo, Eun-Ha ; Yang, Ho-Soon ; Lee, Yun-Woo ;
Korean Journal of Optics and Photonics, volume 24, issue 6, 2013, Pages 331~337
DOI : 10.3807/KJOP.2013.24.6.331
A large optical surface is fabricated by grinding, polishing and figuring. The grinding process is the most rapid and has the largest amount of fabrication of all processes. If we measure the surface precisely and rapidly in the grinding process, it is possible to improve the efficiency of the fabrication process. Since the surface of grinding process is rough and not shiny, it is not easy to measure the surface using light so that we cannot use an interferometer. Therefore, we have to measure the surface using a mechanical method. We can measure the surface under the grinding process by using a laser tracker which is a portable 3-dimensional coordinate measuring machine. In this paper, we used the laser tracker to measure the surface error of 1 m diameter spherical mirror. This measurement result was compared to that of an interferometer. As a result, surface measurement error was found to be
rms (root mean square) and
PV (Peak to Valley), which is accurate enough to apply to the rough surface under the grinding stage.
Optical Analysis for the Estimation of Whole Blood Coagulation Time with Magnetic Particles
Lee, Jaehyun ; Choi, Hyoungsoon ; Jang, Dongwoo ; Nahm, Kie B. ;
Korean Journal of Optics and Photonics, volume 24, issue 6, 2013, Pages 338~341
DOI : 10.3807/KJOP.2013.24.6.338
Prothrombin Time (PT) is used as a measure of blood coagulation time. An optical analysis of the signal generating mechanism is described here for the reflection-type arrangement. Thromboplastin added into serum or whole blood initiates the coagulation process. We added a sufficient amount of magnetic particles into the sample before adding thromboplastin and subjected the mixture to a rotating magnetic field. The laser light gets reflected in a periodically modulated fashion with respect to the magnetic field rotation. Analysis of this decaying modulation could produce a reasonable coagulation time. We also introduce a simulation model to explain the signal generating mechanism using LightTools.
Heat Conduction Analysis of Metal Hybrid Die Adhesive Structure for High Power LED Package
Yim, Hae-Dong ; Choi, Bong-Man ; Lee, Dong-Jin ; Lee, Seung-Gol ; Park, Se-Geun ; O, Beom-Hoan ;
Korean Journal of Optics and Photonics, volume 24, issue 6, 2013, Pages 342~346
DOI : 10.3807/KJOP.2013.24.6.342
We present the thermal analysis result of die bonding for a high power LED package using a metal hybrid silicone adhesive structure. The simulation structure consists of an LED chip, silicone die adhesive, package substrate, silicone-phosphor encapsulation, Al PCB and a heat-sink. As a result, we demonstrate that the heat generated from the chip is easily dissipated through the metal structure. The thermal resistance of the metal hybrid structure was 1.662 K/W. And the thermal resistance of the total package was 5.91 K/W. This result is comparable to the thermal resistance of a eutectic bonded LED package.