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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 13, Issue 6 - Dec 2002
Volume 13, Issue 5 - Oct 2002
Volume 13, Issue 4 - Aug 2002
Volume 13, Issue 3 - Jun 2002
Volume 13, Issue 2 - Apr 2002
Volume 13, Issue 1 - Feb 2002
Selecting the target year
An optomechanical study of large mirrors for satellites
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 1~8
DOI : 10.3807/KJOP.2002.13.1.001
Optical payloads for earth-observation satellites become bigger as the required resolution becomes finer. For example, the diameter of the primary mirror of IKONOS, which has ground sampling distances of 1m/4m in panchromatic/multi spectral bands, is about 700mm. As the size of optical payload becomes bigger, the light-weighting of the mirrors becomes more significant. This paper presents the FEM results of the following four mirror types of 300 m diameter under gravity release and temperature changes: flat back mirror, single arch mirror, double arch mirror, and honeycomb sandwich mirror. Furthermore, this paper extends the FEM results to larger mirrors up to the diameter of 1m based on a general scaling law and Valenete\`s equation.
Analysis of ethanol concentration and refractive-index by use of surface plasmon resonance effect
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 9~14
DOI : 10.3807/KJOP.2002.13.1.009
A surface plasmon sensor has been fabricated for detection of concentration and refractive-index of a mixed solution. Based on the Kretschmann-Raether attenuated-total-reflection configuration, the sensor consists of 54 nm-thick Ag metal layer under a prism and a cell containing the mixed solution. We have observed a nonlinear refractive-index change as the ethanol-water concentration increased. The experimental results show us that the detection limit of the SPR sensor is 3
% in ethanol mass ratio. The concentration-to-index curve shows a linear increase in the range of ethanol concentration from 0% to 50%, but a nonlinearity is observed beyond 50%. We have modeled the nonlinearity and compared it with the experimental results.
Widely-tunable high-speed wavelength converter based on four-wave mixing in a semiconductor-fiber ring laser
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 15~20
DOI : 10.3807/KJOP.2002.13.1.015
We demonstrate a widely-tunable wavelength converter based on four-wave mixing in a semiconductor-fiber ring laser with no external pump light. Applying 10 GHz short pulses at -8 dBm as a probe signal, we achieve continuous wavelength tuning over the semiconductor optical amplifier gain-bandwidth reaching 30 nm down- and 17 m up-wavelength conversion. In addition to the wide tuning capability, the converter shows high-speed conversion and low saturation power capabilities.
Loss improvement of star couplers and arrayed waveguide grating wavelength filter
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 21~26
DOI : 10.3807/KJOP.2002.13.1.021
In the conventional star coupler, a certain amount of loss should be expected because lateral diffraction is used for the power distribution. In this paper, we propose a new design of a low loss star coupler which employs UV-written tapered waveguides and an AWG based on the low loss star couplers, and investigate their various characteristics. The loss of the UV-written star coupler is lower than that of the conventional star coupler, and the AWG device based on the UV-written star couplers shows low loss characteristics.
Analysis of optical splitters in photonic crystals
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 27~31
DOI : 10.3807/KJOP.2002.13.1.027
We design a 1
4 optical splitter made of photonic crystal waveguides and analyze the properties of the optical splitter using the finite-difference time-domain method with perfectly-matched-layer absorbing boundaries. The photonic crystal is constructed from cylindrical rods in air on a square lattice. Our simulation results show that there are different transmission properties for four bend geometries and different incident-wave frequencies. The sum of the power transmission of the splitted light is over 93 percent at a certain geometry and frequency, and the incident power splits in the four arms with almost the same ratio.
1.55 μm polarization mode splitter utilizing two mode interference of Ti:LiNbO
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 32~37
DOI : 10.3807/KJOP.2002.13.1.032
Passive polarization mode splitters at λ
The analysis of error characteristics in self-imaging and improved optimization of waveguide structure for multi-mode interference devices
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 38~43
DOI : 10.3807/KJOP.2002.13.1.038
Simple principles of self-imaging in Multi-Mode Interference (MMI) devices are based on the approximation of propagation constants. The analysis of the basic nature of the self-imaging principle reveals the problems of previous optimization methods, and provides a new scheme to optimize the external variables for the reconciliation of approximation problems by considering two different tendencies of approximation effects. Furthermore, the representative mode method is proposed to make the application easy. This optimization method provides an essential method for stable design and fabrication of MMI devices with improved characteristics.
Analysis of structure and properties of wavelength demultiplexing using photopolymer phase grating
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 44~50
DOI : 10.3807/KJOP.2002.13.1.044
A new wavelength demultiplexing scheme using holographic volume phase grating formed in photopolymer is proposed and demonstrated. Through the analysis and experiments of the design parameters such as wavelength selectivity, operating spectral range, spatial channel distance and spatial intensity distribution of each channel, we proved that the proposed demultiplexing scheme is promising for wavelength division multiplexing (WDM). From the experimental results, the 3 dB bandwidth of 0.21nm and the crosstalk level of 26 dB for a 0.8 nm channel spacing are observed.
The design of a single layer antireflection coating on the facet of buried channel waveguide devices using the angular spectrum method and field profiles obtained by the variational method
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 51~57
DOI : 10.3807/KJOP.2002.13.1.051
We have calculated the optimum refractive index and normalized thickness of a single layer antireflection coating on the facet of buried channel waveguides as a function of waveguide width for several waveguide depths using the angular spectrum method and field profiles obtained by the effective index method (EIM) and the variational method (VM), respectively, and discussed the results. In the area of large waveguide width, the optimum parameters of a single layer antireflection coating obtained by both methods are almost the same. However, as waveguide width decreases, the parameters obtained by the VM approach those of a single layer antireflection coating between cladding layer and air, while those obtained by the EIM do not approach those, and the difference between the two parameters is large. The tolerance maps of the quasi-TE and quasi-TM modes obtained by the VM for square waveguides are located in almost the same area regardless of refractive index contrast, while those obtained by the free space radiation mode (FSRM) method for refractive index contrast of 10% are located in the different area. Thus, we think that the tolerance maps obtained by the VM are more exact than those obtained by the FSRM method.
Stabilization and characterization of a 10 GHz harmonically mode-locked Er-doped fiber ring laser by suppression of relaxation oscillation
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 58~64
DOI : 10.3807/KJOP.2002.13.1.058
Using Mach-Zehnder type intensity modulator, we stabilized a 10 GHz harmonically mode-locked dispersion-compensated fiber ring laser using a feedback controlling system, and we measured its stability. The laser was stabilized for more than 16 hours by controlling the cavity length to suppress the relaxation oscillation frequency component which had caused the laser output instability. The ms timing jitter and ms amplitude noise were measured to be 260-524 fsec and 4~11.5%, respectively, and BER test measurement showed a value of 10
Output characteristics of a continuous wave deuterium fluoride chemical laser
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 65~69
DOI : 10.3807/KJOP.2002.13.1.065
A continuous wave deuterium fluoride (DF) chemical laser was designed and manufactured, and we have achieved DF laser beam generation with the maximum output power of 101 W. The gain medium is vibration-rotationally excited DF molecules produced by F+D
cold reaction through supersonic diffusion mixing in an optical cavity. F atoms are produced in a combustor by F
reaction and injected into the cavity through a supersonic nozzle. The optimal chemical efficiency was measured to be 5.12% and specific power to be 96.5 J/g.
Study of frequency chirping of pulse amplified laser beam by using heterodyne method
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 70~72
DOI : 10.3807/KJOP.2002.13.1.070
Amplified pulsed laser beam with narrow linewidth was generated from CW laser beam with narrow linewidth by using frequency doubled Nd:YAG laser beam and Bethune cell. The degree of the frequency chirping of the amplified pulse laser was measured by using the heterodyne method and obtained by calculating instantaneous phase change from heterodyne beating signals. The frequency chirping of amplified pulsed laser beam from CW laser beam with sub-MHz linewidth by 10 ns pulse was 80 MHz so that pulsed laser beam with very narrow linewidth was obtained.
On-off intermittency in an intracavity frequency doubled Nd:YAG laser pumped by a laser diode
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 73~78
DOI : 10.3807/KJOP.2002.13.1.073
We have investigated the lasing characteristics of intracavity second harmonics of a Nd:YAG laser pumped by a laser diode. Through the analysis of the scalings of laminar phases, we verify that the second harmonics are generated through on-off intermittency. The intermittent behavior can be reproduced by a numerical simulation with rate equations.
Optical image encryption by use of double random phase mask and analysis of its encryption level
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 79~83
DOI : 10.3807/KJOP.2002.13.1.079
We present a method to improve encryption level by use of a rotational term in the double random-phase-mask(RPM) encryption system. Encrypted optical images are recorded in a photorefractive LiNbO
:Fe crystal and reconstructed by using a phase conjugated reading beam. The encryption level for the analog image is analyzed by use of visibility function.
5 Gb/s all-optical XOR gate by using semiconductor optical amplifier
Korean Journal of Optics and Photonics, volume 13, issue 1, 2002, Pages 84~87
DOI : 10.3807/KJOP.2002.13.1.084
By using SOA (Semiconductor Optical Amplifier), all-optical XOR gate has been demonstrated at 5 Gb/s in RZ format. Firstly, Boolean AB-and Boolean AB have been obtained. Then, Boolean AB and Boolean AB have been combined to achieve the all-optical XOR gate, which has Boolean logic of AB+AB.