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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Optical Society of Korea
Journal Basic Information
Journal DOI :
Optical Society of Korea
Editor in Chief :
Volume & Issues
Volume 11, Issue 4 - Dec 2007
Volume 11, Issue 3 - Sep 2007
Volume 11, Issue 2 - Jun 2007
Volume 11, Issue 1 - Mar 2007
Selecting the target year
A Study on the Aspheric Glass tens Forming Analysis in the Progressive GMP Process
Chang, Sung-Ho ; Lee, Young-Min ; Shin, Kwang-Ho ; Heo, Young-Moo ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 85~92
DOI : 10.3807/JOSK.2007.11.3.085
In the past, precision optical glass lenses were produced through multiple processes such as grinding and polishing, but mass production of aspheric glass lenses requiring high accuracy and having complex profile was rather difficult. In such a background, the high-precision optical glass molding pressing (GMP) process was developed with an eye to mass production of precision optical glass parts by molding press. In this paper, as a fundamental research to develop the multi-cavity mold for higher productivity of a progressive GMP process used in the fabrication of an aspheric glass lens, an aspheric glass lens forming simulation was carried out.
A 240 km Reach DWDM-PON of 8-Gb/s Capacity using an Optical Amplifier
Kim, Min-Hwan ; Lee, Sang-Mook ; Mun, Sil-Gu ; Lee, Chang-Hee ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 93~96
DOI : 10.3807/JOSK.2007.11.3.093
We demonstrate a 240 km reach DWDM-PON at 8-Gb/s capacity based on wavelength-locked Fabry-Perot laser diodes and a bidirectional EDFA. We achieve a packet-error-free transmission in both the 64 upstream and 64 downstream channels, guaranteeing a 125 Mb/s symmetric data rate per user. There is no noticeable dispersion penalty. The power penalty due to the crosstalk induced by the DWDM transmission and detuning between AWGs is less than 1.2 dB, when the detuning is within
Single-mode Condition and Dispersion of Terahertz Photonic Crystal Fiber
Kim, Soan ; Kee, Chul-Sik ; Lee, Jong-Min ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 97~100
DOI : 10.3807/JOSK.2007.11.3.097
We have investigated properties of a plastic photonic crystal fiber guiding terahertz radiations, THz photonic crystal fiber. The single-mode condition and dispersion of a plastic triangular THz photonic crystal fiber are investigated by using the plane wave expansion method and the beam propagation method. The THz photonic crystal fiber can perform as a single-mode fiber below 2.5 THz when the ratio of diameter (d) and period (
) of air holes is less than 0.475. The THz photonic crystal fiber with
shows almost zero flattened dispersion behavior,
, in the THz frequency range from 0.8 to 2.0 THz.
Wavelength Division Multiplexing-Passive Optical Network Based FTTH Field Trial Test
Kim, Geun-Young ; Kim, Jin-Hee ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 101~107
DOI : 10.3807/JOSK.2007.11.3.101
In this paper, we have presented the results of Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) based fiber-to-the-home (FTTH) field trial test which was held in the city of Gwangju. We have implemented an injection locked Fabry-Perot Laser Diode (FP-LD) based WDM-PON system and reliably delivered Internet Protocol TV (IP-TV), networked Personal Video Recorder (N-PVR), High-Definition Video on Demand (HD-VoD), Education on Demand (EoD) and Internet service as FTTH service through the system during the field trial test. We have also verified that the WDM-PON system worked well to provide quality of service (QoS) guaranteed 100Mbps bandwidth per subscriber. Furthermore, we have presented network designing issues in Outside Plant (OSP) and Customer Premises Network (CPN) that should be overcome to efficiently deploy FTTH service. Finally, based on the field trial test results, we proposed FTTH service deployment strategies.
3D Nano Object Recognition based on Phase Measurement Technique
Kim, Dae-Suk ; Baek, Byung-Joon ; Kim, Young-Dong ; Javidi, Bahram ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 108~112
DOI : 10.3807/JOSK.2007.11.3.108
Spectroscopic ellipsometry (SE) has become an important tool in scatterometry based nano-structure 3D profiling. In this paper, we propose a novel 3D nano object recognition method by use of phase sensitive scatterometry. We claims that only phase sensitive scatterometry can provide a reasonable 3D nano-object recognition capability since phase data gives much higher sensitive 3D information than amplitude data. To show the validity of this approach, first we generate various
order SE spectrum data (
) which can be calculated through rigorous coupled-wave analysis (RCWA) algorithm and then we calculate correlation values between a reference spectrum and an object spectrum which is varied for several different object 3D shape.
LED Light Coupler Design for a Ultra Thin Light Guide
Lee, J.H. ; Chang, W. ; Choi, D. ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 113~117
DOI : 10.3807/JOSK.2007.11.3.113
A LED light coupler is proposed for coupling light from a mini side LED of 0.4 mm height to a very thin (
) light guide. Due to the ultra thinness of the light guide, conventional light couplings between LEDs and light guides do not provide adequate coupling efficiency. The designed LED coupler is a compound lens of 3.5 mm length, 1.2 mm height, and 3.3 mm width. The courier first collimates the light from the LED and then concentrates the light in a manner similar to a compound parabolic concentrate, (CPC) into the light guide. The exit surface of the coupler is additionally textured to have micro patterns in order to control the radiance profile.
Optimization of the Emitting Structure of Flat Fluorescent Lamps for LCD Backlight Applications
Park, Ji-Hee ; Ko, Jae-Hyeon ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 118~123
DOI : 10.3807/JOSK.2007.11.3.118
The emitting structure of multi-channel-type flat fluorescent lamps (FFLs) combined by a lenticular-lens-patterned diffuser plate was optimized by the ray tracing technique. The optimal parameters such as the distance between the channels of the FFL and the distance between the FFL and the diffuser plate were suggested from the viewpoint of the luminance uniformity. The best luminance uniformity, which was higher than 90%, was obtained at the channel distance of 4 mm and the distance of 12.5 mm between the FFL and the patterned diffuser plate.
Comparison of Fiber-Based Frequency Comb and Ti:Sapphire-Based Frequency Comb
Lee, Won-Kyu ; Kim, Eok-Bong ; Yee, Dae-Su ; Suh, Ho-Suhng ; Park, Chang-Yong ; Yu, Dai-Hyuk ; Park, Sang-Eon ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 124~129
DOI : 10.3807/JOSK.2007.11.3.124
For the first time we compare two kinds of optical frequency combs, one of which is based on a Ti:sapphire femtosecond laser and the other is based on a mode-locked erbium-doped fiber laser. The comparison is performed by measuring an optical frequency standard with these two combs simultaneously. The two frequency measurements agree within 1.8 Hz (
) with the uncertainty of 17.2 Hz (
), from which it can be concluded that the Ti:sapphire-based frequency comb and the fiber-based frequency comb have no systematic discrepancy at this level of uncertainty.
Characteristics of Sŏlc Filters in X
Nonlinear Photonic Crystal
Kee, Chul-Sik ; Lee, Jong-Min ; Lee, Yeung-Lak ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 130~132
DOI : 10.3807/JOSK.2007.11.3.130
The characteristics of
nonlinear photonic crystals, periodically poled lithium niobate (
), were investigated by the Jones matrix method. The transmittance increases and the full width half maximum of the filter becomes narrow as the duty ratio increases. However, the filtering wavelength does not change. The transmittance at the filtering wavelength is over 95% when the duty ratio is larger than 0.35.
Comparison of Quantum Wells based on InGaAs(P)/InP and InGa(Al)As/InAlAs Material Systems in View of Carrier Escape Times for High-Saturation-Optical-Power Electroabsorption Modulators
Kim, Kang-Baek ; Shin, Dong-Soo ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 133~137
DOI : 10.3807/JOSK.2007.11.3.133
We compare electroabsorption modulators (EAMs) with multiple quantum wells (MQWs) based on InGaAs(P)/InP and InGa(Al)As/InAlAs material systems. We carefully choose the quantum-well structures so that the structures based on different material systems have similar band-offset energies and excition-peak wavelengths. Assuming the same light wavelength of
, we show the transfer functions of EAMs with each quantum-well structure and calculate the escape times of photogenerated charge carriers. As the heavy-hole escape time of the quantum well based on InGaAs(P)/InP is much longer than those of photogenerated charge carriers of InGa(Al)As/InAlAs, the EAM based on the InGa(Al)As/InAlAs material seems to be more suitable for high-optical-power operation.
Coherent Absorption Spectroscopy with Supercontinuum for Semiconductor Quantum Well Structure
Byeon, Ciare C. ; Oh, Myoung-Kyu ; Kang, Hoon-Soo ; Ko, Do-Kyeong ; Lee, Jong-Min ; Kim, Jong-Su ; Choi, Hyoung-Gyu ; Jeong, Mun-Seok ; Kee, Chul-Sik ;
Journal of the Optical Society of Korea, volume 11, issue 3, 2007, Pages 138~141
DOI : 10.3807/JOSK.2007.11.3.138
We suggest that supercontinuum can be used for absorption spectroscopy to observe the exciton levels of a semiconductor nano-structure. Exciton absorption spectrum of a GaAs/AlGaAs quantum well was observed using supercontinuum generated by a microstructrured fiber pumped by a femtosecond (fs) pulsed laser. Significantly narrower peaks were observed in the absorption spectrum from 11 K up to room temperature than photoluminescence (PL) spectrum peaks. Because supercontinuum is coherent light and can readily provide high enough intensity, this method can provide a coherent ultra-broad band light source to identify exciton levels in semiconductors, and be applicable to coherent nonlinear spectroscopy such as electromagnetically induced transparency (EIT), lasing without inversion (LWI) and coherent photon control in semiconductor quantum structures.