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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Optical Society of Korea
Journal Basic Information
Journal DOI :
Optical Society of Korea
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Volume & Issues
Volume 8, Issue 4 - Dec 2004
Volume 8, Issue 3 - Sep 2004
Volume 8, Issue 2 - Jun 2004
Volume 8, Issue 1 - Mar 2004
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Optimal Design of Arrayed Waveguide Grating
Jung, Jae-Hoon ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 99~103
DOI : 10.3807/JOSK.2004.8.3.099
This paper describes the optimal design of an AWG spectrum to meet various specifications and improve some physical parameters. The objective function is the norm of the difference between design parameters and target values. To obtain the design parameters, the Fourier model is employed and the design variables arc spacing of array waveguide, width of array waveguide, optical path difference, and focal length. The (1+1) Evolution Strategy is employed as the optimization tool. The optimization procedure is applied to a 16-channel AWG and the optimized design variables will considerably improve the system performance.
Spectral Characteristics of 50 GHz FSR Etalon for Wide-band DWDM Application
Kim, Jong-Deog ; Moon, Jong-Tae ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 104~107
DOI : 10.3807/JOSK.2004.8.3.104
The periodic transmission spectrum of a solid etalon for wide-band capability is analyzed both theoretically and experimentally. In the transmission spectrum with an incident area of a photodetector, the peak wavelength and transmittance are deeply dependent on the incident angle and the divergence angle of the input laser beam. A thermal adjustment for a solid etalon is an optional way to control the transmission spectrum instead of the inefficient fine-angle alignment. In the result, we present the deviations of free spectral range (FSR) by the change in angle and temperature over wide wavelength range.
Comparision of Irregular Quadtree Decomposition with Full-search Block Matching for Synthesizing Intermediate Images
Kim, Kyung-Tae ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 108~114
DOI : 10.3807/JOSK.2004.8.3.108
To allow multiple viewers to see the correct perspective and to provide a singh1 viewer with motion parallax cues during head movement, more than two views arc needed. Since it is prohibitive to acquire, process, and transmit a continuum of views, it. would preferable to acquire only a minimal set of views and to synthesize intermediate images. This paper presents how to synthesize the intermediate images using irregular quadtree decomposition and compares the proposed methods with full-search block matching. The image at the middle viewpoint between both viewpoints is synthesized and yields a 32.8 ㏈ peak-signal-to-noise ratio (PSNR) which is 2.8 ㏈ high and has a running time 30% of that for conventional full-search block matching.
Efficient Algorithms to Generate Elemental Images in Integral Imaging
Oh, Se-Chan ; Hong, Ji-Soo ; Park, Jae-Hyeung ; Lee, Byoung-Ho ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 115~121
DOI : 10.3807/JOSK.2004.8.3.115
In this paper, we propose a new algorithm to generate elemental images in a computer generated integral imaging system. By comparing the computing time of this algorithm with that of the existing algorithm, we prove the efficiency of this algorithm. Two more algorithms considering the finite size of each pixel are also proposed. These algorithms enhance the quality of the integrated image while generating the elemental image as fast as the existing algorithm.
Polarization Phase-shifting Technique in Shearographic System with a Wollaston Prism
Kim, Soo-Gil ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 122~126
DOI : 10.3807/JOSK.2004.8.3.122
The method to obtain four speckle patterns with relative phase shift of
by passive devices such as two waveplates and a linear polarizer, awl to calculate the phase at each point of the speckle pattern in shearography with a Wollaston prism is presented, and the feasibility of the proposed method is theoretically demonstrated by Jones vector.
Femtosecond Micromachining Applications for Optical Devices
Sohn, Ik-Bu ; Lee, Man-Seop ; Woo, Jeong-Sik ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 127~131
DOI : 10.3807/JOSK.2004.8.3.127
This paper investigates applications of femtosecond lasers for the micromachining of transparent materials and fabrication of optical devices. We show commercial micromachining examples of transparent materials which have been fabricated for various applications. Near infrared femtosecond laser processing is an attractive method to fabricate three-dimensional optical waveguides into various transparent materials. Focused femtosecond laser pulses induce a permanent refractive-index change only near the focal point. We also demonstrate a Y coupler with the splitting ratio of 1:1 written by femtosecond laser pulses into a fused silica glass. The minimum propagation loss of 0.8 ㏈/㎝ awl the refractive-index change of 0.006-0.01 at the wavelength of 1550 ㎚ were achieved by optimization of the laser fluence.
Delayed Luminescence of Biophotons from Plant Leaves
Sung, Baeck-Kyoung ; Yi, Seung-Ho ; Lee, Chang-Hoon ; Yang, Joon-Mo ; Kim, Jai-Soon ; Soh, Kwang-Sup ; Yang, Jong-Soo ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 132~136
DOI : 10.3807/JOSK.2004.8.3.132
Delayed luminescence of plant leaves was imaged by a 2-D cooled charge-coupled device. We report the delayed luminescence imaging of normal/injured leaves picked ami the leaves intact. The luminescent intensity was lower in leaf veins, scars and edge cut. The intensity of delayed luminescence from intact leaves was higher than that of picked leaves. These results indirectly support the argument that the delayed luminescence of a photosynthetic system is closely related to the electron transfer process of PSII in the thylakoid membrane.
Eigenmode of Anisotropic Planar Waveguide
Kweon, Gyeong-Il ; Hwang-bo, Seung ; Kim, Cheol-Ho ;
Journal of the Optical Society of Korea, volume 8, issue 3, 2004, Pages 137~146
DOI : 10.3807/JOSK.2004.8.3.137
A new method of obtaining the eigenmode of an anisotropic planar waveguide is studied. The planar waveguide can be composed of an arbitrary number of isotropic or uniaxially anisotropic layers, provided all the optical axes arc lying in the incidence plane. Since the equation of motion for the TE mode is not different from that for the TE mode in an isotropic planar waveguide, only the equation of motion for the TM mode is of any concern. For this kind of device structure, the Maxwell's equations can be solved for one component of the electric field and one component of the magnetic field. The resulting coupled set of equations is linear in the propagation constant and the eigenmode can be easily obtained using canned numerical routines.