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Journal of the Optical Society of Korea

Simranjit Singh, Sonak Saini, Gurpreet Kaur, Rajinder Singh KalerFor multi parameter optimization of Raman Fiber Amplifier (RFA), a simple genetic algorithm is presented in the scenario of a 320 channel Dense Wavelength Division Multiplexed (DWDM) system at channel spacing of 25 GHz. The large average gain (> 22 dB) is observed from optimized RFA with the ... [J. Opt. Soc. Korea 18, 118-123 (2014)] 2014/06/01 - 13:26

Jae Seung LeeWe derive joint probability density functions (JPDFs) for two adjacent data from direct-detection optical receivers in dense wavelength-division multiplexing systems. We show that the decision using two data per bit can increase the receiver sensitivity compared with the conventional decision. Our ... [J. Opt. Soc. Korea 18, 124-128 (2014)] 2014/06/01 - 13:26

In-Ho Lee, Myungjin ChoIn this paper, we propose a simple Double random phase encryption (DRPE)-based orthogonal encoding technique for color image encryption. In the proposed orthogonal encoding technique, a color image is decomposed into red, green, and blue components before encryption, and the three components are ... [J. Opt. Soc. Korea 18, 129-133 (2014)] 2014/06/01 - 13:26

Jae Myung Ryu, Jeong Hyo Oh, Jae Heung JoThe number of lens groups in modern zoom camera systems is increased above that of conventional systems in order to improve the speed of the auto focus with the high quality image. As a result, it is difficult to calculate zoom loci using the conventional analytic method, and even the recent ... [J. Opt. Soc. Korea 18, 134-145 (2014)] 2014/06/01 - 13:26

Jun Li, Yaqing Li, Yuping Wang, Ke Li, Rong Li, Jiaosheng Li, Yangyang PanWe propose an experimental holographic imaging scheme combining compressive sensing (CS) theory with digital holography in phase-shifting conditions. We use the Mach-Zehnder interferometer for hologram formation, and apply the compressive sensing (CS) approach to the holography acquisition process. ... [J. Opt. Soc. Korea 18, 146-150 (2014)] 2014/06/01 - 13:26

Seung Yun Nam, Stanislav Y. EmelianovAlthough various ophthalmic imaging methods, including fundus photography and optical coherence tomography, have been applied for effective diagnosis of ocular diseases with high spatial resolution, most of them are limited by shallow imaging penetration depth and a narrow field of view. Also, many ... [J. Opt. Soc. Korea 18, 151-155 (2014)] 2014/06/01 - 13:26

Kyung Hun Lyum, Hee Kyu Yoon, Sang Jun Kim, Sung Hyuck An, Sang Youl KimAnisotropy profile of a rubbed polyimide film is investigated using both a modified ultra high precision transmission ellipsometer and the analysis software previously developed to determine the optic axis distribution of discotic liquid crystals in the wide view film. The distorted sinusoidal ... [J. Opt. Soc. Korea 18, 156-161 (2014)] 2014/06/01 - 13:26

Thamer Fahad Al-Mashhadani, Md. Zaini Jamaludin, Mohammed Hayder Al-Mansoori, Fairuz Abdullah, Abdulla Khudair AbbasThe impact of booster section length made from passive erbium-doped fiber (EDF) on the L-band multiwavelength Brillouin-Erbium fiber laser (MBEFL) is studied experimentally in this paper. The influence on the performance of MBEFL in term of number of generated Stokes lines, tuning range and lasing ... [J. Opt. Soc. Korea 18, 162-166 (2014)] 2014/06/01 - 13:26

Mohammad Yazdanypoor, Farzin EmamiA novel multi-oxide layer structure for vertical cavity surface emitting laser (VCSEL) structures is proposed to achieve higher single mode output power. The structure has four oxide layers with different aperture sizes and thicknesses. The oxide layer thicknesses are optimized simultaneously to ... [J. Opt. Soc. Korea 18, 167-173 (2014)] 2014/06/01 - 13:26

Nak-Hyeon Kim, Kyung Min Byun, Seoyoung Hwang, Yena Lee, Sang Beom JunSince in vitro neural recording and imaging applications based on a surface plasmon resonance (SPR) technique have expanded dramatically in recent years, cytotoxicity assessment to ensure the biosafety and biocompatibility for those applications is crucial. Here, we report the cytotoxicity of the ... [J. Opt. Soc. Korea 18, 174-179 (2014)] 2014/06/01 - 13:26

Sung Chul KimThe surface of semiconductor solar cells, such as a-Si or CIGS (CuInGaSe) solar cells is not flat but textured in the microscopic domain. With textured surfaces, the optical reflectivity of a solar cell is different from that of flat surfaces in the wavelength region. In this paper, the effects of ... [J. Opt. Soc. Korea 18, 180-183 (2014)] 2014/06/01 - 13:26

Chul Gyu Jhun, Jin Seog GwagThis study examined the effects of particle size on the light scattering of a nano-sized color filter pigment used to obtain a range of colors in liquid crystal displays. The contrast ratio is one of the most important characteristics of liquid crystal displays. When a color filter is located ... [J. Opt. Soc. Korea 18, 184-187 (2014)] 2014/06/01 - 13:26

Byong Chon Park, Myung-Whun Kim, Jin Seung KimA general theory of scalar wave scattering by two separated particles is developed to give the coefficients of scattering and transmission in the form of recurrence formulae. Iterative applications of the formulae yield the coefficients in the form of power series of the coefficients obtained from ... [J. Opt. Soc. Korea 18, 188-193 (2014)] 2014/06/01 - 13:26

Azadeh Karimi, Farzin Emami, Najmeh NozhatIn this paper, four apodization functions are proposed for silicon-on-insulator (SOI) strip waveguides with sidewall-corrugated gratings. The effects of apodization functions on the full width at half maximum (FWHM), the side-lobe level, and the reflectivity of the reflection spectrum are studied ... [J. Opt. Soc. Korea 18, 101-109 (2014)] 2014/05/21 - 09:54

Ho Sik Hwang, Hye Young Shin, Choun-Ki JooIn this study, we objectively determined whether the ReSTOR as a multifocal
IOL (intraocular lens) has a multifocal function compared to the IQ as a monofocal
IOL in vivo by OQAS (Optical Quality Analysis System). Eighteen patients who had
cataract ... [J. Opt. Soc. Korea 18, 110-117 (2014)] 2014/05/21 - 09:54

Sair Alcekh Yasin, Ali Reza Erfanian, Mohammad Reza Mosavi, Ali MohammadiSpin reticle infrared seekers have good linearity, and the pulse-modulated reticle seekers have good digital characteristics for anti-jamming processing. A basic design for a spin pulse-modulated reticle is introduced. This design uses the rotating design of the optical system in the spin infrared ... [J. Opt. Soc. Korea 18, 1-8 (2014)] 2014/03/13 - 00:29

Sucbei Moon, Dug Young KimWe present a novel bandwidth measurement scheme for multimode optical fibers. Amplified spontaneous emission (ASE) radiation was utilized for a source of intrinsically modulated light with a wide modulation bandwidth. In our measurement scheme, the continuous-wave (CW) ASE light that passed through ... [J. Opt. Soc. Korea 18, 15-22 (2014)] 2014/03/13 - 00:29

Jin Woo Kim, Jae Myung Ryu, Jae Heung Jo, Young-Joo KimRecently, the number of camera companies that produce commercializing interchangeable lens systems such as digital single lens reflex (DSLR) and compact system camera (CSC) lenses has been gradually increasing. These interchangeable lenses have various kinds of lenses with distinct specifications. ... [J. Opt. Soc. Korea 18, 23-31 (2014)] 2014/03/13 - 00:29

Youngmin Kim, Hoonjong Kang, Yangkeun Ahn, Kwang-Soon Choi, Byoungha Park, Sunghee Hong, Kwang-Mo JungA tangible floating display that can provide different perspective views without special glasses being introduced. The proposed system can display perspective floating images in the space in front of the system with the help of concave mirrors. In order to avoid wearing special equipment to ... [J. Opt. Soc. Korea 18, 32-36 (2014)] 2014/03/13 - 00:29

Do-Young Yoon, Tai-Wook Kim, Minsu Kim, Heui-Jae PahkThe use of a laser interferometer as a metrological tool in micro-optics measurement is demonstrated. A transmissive interferometer is effective in measuring an optical specimen having a high angle slope. A configuration that consists of an optical resolution of 0.62 micron is adapted to measure a ... [J. Opt. Soc. Korea 18, 37-44 (2014)] 2014/03/13 - 00:29

Je Hong Park, Jong Su Kim, Jong Tae KimWell-crystallized $BaSi_2O_5:Eu^{2+}$ phosphor films were synthesized by
heat treatment of spin-coated BaO:Eu on $SiO_2$ glass. We investigated
luminescence-structure properties of these phosphor films as a function of heat-treatment temperature. ... [J. Opt. Soc. Korea 18, 45-49 (2014)] 2014/03/13 - 00:29

Walid Tawfik, W. Aslam Farooq, Z.A. AlahmedIn this paper we studied the laser-induced crater depth, mass, and emission spectra of laser-ablated high-density polyethylene (HDPE) polymer using the laser-induced plasma spectroscopy (LIPS) technique. This study was performed using a Nd:YAG laser with 100 mJ energy and 7 ns pulse width, focused ... [J. Opt. Soc. Korea 18, 50-54 (2014)] 2014/03/13 - 00:29

Byeong Hwan Jeon, Yu-Gyeong Chae, Sang Seok Hwang, Dong Kyu Kim, Chulho Oak, Eun-Kee Park, Yeh-Chan AhnSarcopenia, or reduced muscle mass and volume, is due to various factors such as senile change, neuronal degeneration, drug, malignancy, and sepsis. Sarcopenia with the aging process has been evidenced by the decline in muscle mass by 0.5 to 1% per year with 3-5% reduction in muscle strength for 10 ... [J. Opt. Soc. Korea 18, 55-59 (2014)] 2014/03/13 - 00:29

In Hyung Baek, Bong Joo Kang, Young Uk Jeong, Fabian RotermundWe report the generation of 3.3-mW single-cycle terahertz (THz) pulses at 1-kHz repetition rate via optical rectification in MgO-doped prism-cut stoichiometric LiNbO3. Efficient pulse-front tilting of 800-nm pulses was realized by an optimized single-lens focusing scheme for radially-symmetric ... [J. Opt. Soc. Korea 18, 60-64 (2014)] 2014/03/13 - 00:29

Mohammad Reza Salehi, Seyed Farhad TaherianThis paper presents the simulation and design of an all-optical subtractor using a quantum-dot semiconductor optical amplifier Mach-Zehnder interferometer (QD-SOA MZI) structure consisting of two cascaded switches, the first of which produces the differential bit. Then the second switch produces ... [J. Opt. Soc. Korea 18, 65-70 (2014)] 2014/03/13 - 00:29

Min-Kyu Park, Ho Jun Lee, Ji-Sub Park, Mugeon Kim, Jeong Min Bae, Imtiaz Mahmud, Hak-Rin KimWe present design and fabrication of a multi-focusing microlens array (MLA) using a thermal reflow method. To obtain multi-focusing properties with different numerical apertures at the elemental lens of the MLA, double-cylinder photoresist (PR) structures with different diameters were made within ... [J. Opt. Soc. Korea 18, 71-77 (2014)] 2014/03/13 - 00:29

Jin Seog GwagThis paper presents an advanced patterned vertical aligned nematic liquid crystal (APVA) mode as a way of improving the transmittance of the conventional patterned, vertically-aligned nematic liquid crystal (PVA) mode. The APVA was characterized by multi-electrodes, which play an important role in ... [J. Opt. Soc. Korea 18, 78-81 (2014)] 2014/03/13 - 00:29

Majid Akhlaghi, Farzin Emami, Mokhtar Sha Sadeghi, Mohammad YazdanypoorA binary-coupled dipole approximation (BCDA) is described for designing metal nanoparticles with nonperiodic structures in one, two, and three dimensions. This method can be used to simulate the variation of near- and far-field properties through the interactions of metal nanoparticles. An ... [J. Opt. Soc. Korea 18, 82-88 (2014)] 2014/03/13 - 00:29

Ye Seul Baek, Hong-Suk Kim, Seung-Ok ParkIt is established that the perceived image contrast is affected by surround luminance. In order to
get the same perceived image contrast, the optimum surround compensation ratios for those surround conditions
is needed. Much research has been performed for dark, dim, and average surrounds. In ... [J. Opt. Soc. Korea 18, 89-94 (2014)] 2014/03/13 - 00:29

Kyungnam Kang, Jungho KimWe numerically investigate the effect of sunlight polarization on the absorption efficiency of V-shaped organic solar cells (VOSCs) using the finite element method (FEM). The spectral distribution of absorbance and the spatial distribution of power dissipation are calculated as a function of the ... [J. Opt. Soc. Korea 18, 9-14 (2014)] 2014/03/13 - 00:29

Youngsun Ha, Wonzoo ChungWe propose a blind feedforward phase noise mitigation method in the time-domain for a coherent
optical orthogonal frequency division multiplexing (CO-OFDM) systems. By exploiting the redundancy of the
cyclic prefix (CP), the proposed scheme acquires the overall phase noise difference information ... [J. Opt. Soc. Korea 17, 467-470 (2013)] 2014/01/09 - 00:46

Ahmed M. Alhassan, Nasreen Badruddin, Naufal M. Saad, Syed A. AljunidThe beating of two or more lasers that have the same or a finite difference in the central frequencies, is the main source of noise in spectral amplitude coding optical code division multiple access (SAC OCDMA) systems. In this paper we adopt a spatial multiplexing (SM) scheme for SAC OCDMA systems ... [J. Opt. Soc. Korea 17, 471-480 (2013)] 2014/01/09 - 00:46

Jiansen Ye, Zhuo LiA method for the measurement of the concentration of methane is experimentally demonstrated. The wavelength filter and gas cell are combined by using one Fabry-Perot etalon, which is filmed with the reflectivity of 96%. The optical broadband source is not only filtered to match the absorption ... [J. Opt. Soc. Korea 17, 481-485 (2013)] 2014/01/09 - 00:46

Wenjing Yue, Haeng-Jung Kim, Sang-Shin LeeA portable infrared laser transmitter delivering a highly uniform detectable beam was demonstrated. It incorporates a flexible beam shaper, comprising a perforated diffuser sheet in conjunction with a pinhole. The beam shaper plays the prominent role of flexibly tailoring the incoming light via ... [J. Opt. Soc. Korea 17, 486-490 (2013)] 2014/01/09 - 00:46

Yuhua Chong, Chun Yang, Xianghua Li, Quanyi YeThis paper proposes a frequency-doubling optoelectronic oscillator employing a novel three-arm dual-output Mach-Zehnder modulator (MZM). One output of the MZM generates the fundamental-frequency signal which is recycled by the microwave optical fiber link for oscillation, and the other output can ... [J. Opt. Soc. Korea 17, 491-493 (2013)] 2014/01/09 - 00:46

In-Ho Lee, Myungjin ChoIn this paper, we present an optical encryption and information authentication of 3D objects considering wireless channel characteristics. Using the optical encryption such as double random phase encryption (DRPE) and 3D integral imaging, a 3D scene with encryption can be transmitted. However, the ... [J. Opt. Soc. Korea 17, 494-499 (2013)] 2014/01/09 - 00:46

Myungjin Cho, Donghak ShinIn this paper, we propose a novel framework to evaluate the depth resolution of axially distributed stereo sensing (ADSS) under fixed resource constraints. The proposed framework can evaluate the performance of ADSS systems based on various sensing parameters such as the number of cameras, the ... [J. Opt. Soc. Korea 17, 500-505 (2013)] 2014/01/09 - 00:46

Byung-Yun Joo, Jae-Hyeon KoRecently, the color separation issue of wide-spreading white LEDs has attracted attention due to their wide applicability as light sources in direct-lit LCD backlights. These wide-spreading LED packages usually consist of LED chips, a color-conversion phosphor layer, and a light-shaping lens. The ... [J. Opt. Soc. Korea 17, 506-512 (2013)] 2014/01/09 - 00:46

Minwook Kang, Dong Won Kang, Jae W. HahnRecently, maskless lithography (ML) systems have become popular in digital manufacturing technologies. To achieve high-throughput manufacturing processes, digital micromirror devices (DMD) in ML systems must be driven to their operational limits, often in harsh conditions. We propose an instrument ... [J. Opt. Soc. Korea 17, 513-517 (2013)] 2014/01/09 - 00:46

Sung-Chan Park, Sang-Hun LeeThis study presents a new design method for a zoom lens, in which real lens groups are designed successively to combine to form a lens modules zoom system. The lens modules and aberrations are applied to the initial design for a four-group inner-focus zoom system. An initial design with a focal ... [J. Opt. Soc. Korea 17, 518-524 (2013)] 2014/01/09 - 00:46