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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Optical Society of Korea
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Journal DOI :
Optical Society of Korea
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Volume & Issues
Volume 14, Issue 4 - Dec 2010
Volume 14, Issue 3 - Sep 2010
Volume 14, Issue 2 - Jun 2010
Volume 14, Issue 1 - Mar 2010
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Common-path Optical Coherence Tomography for Biomedical Imaging and Sensing
Kang, Jin-U. ; Han, Jae-Ho ; Liu, Xuan ; Zhang, Kang ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 1~13
DOI : 10.3807/JOSK.2010.14.1.001
This paper describes a development of a fiber optic common-path optical coherence tomography (OCT) based imaging and guided system that possess ability to reliably identify optically transparent targets that are on the micron scale; ability to maintain a precise and safe position from the target; ability to provide spectroscopic imaging; ability to imaging biological target in 3-D. The system is based on a high resolution fiber optic Common-Path OCT (CP-OCT) that can be integrated into various mini-probes and tools. The system is capable of obtaining >70K A-scan per second with a resolution better than
. We have demonstrated that the system is capable of one-dimensional real-time depth tracking, tool motion limiting and motion compensation, oxygen-saturation level imaging, and high resolution 3-D images for various biomedical applications.
Fiber Ring Laser Intra-cavity Absorption Spectroscopy for Gas Sensing: Analysis and Experiment
Li, Mo ; Liu, Kun ; Jing, Wencai ; Peng, Gang-Ding ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 14~21
DOI : 10.3807/JOSK.2010.14.1.014
Fiber ring laser based intra-cavity absorption spectroscopic sensor has great potential for high sensitivity gas detection. Using the rate equations and propagation equations, we investigated theoretically factors that affect the sensitivity of such fiber ring laser sensors and determined the optimal design parameters and conditions for significant enhancement of the system sensitivity. Experiments have been conducted to determine the sensitivity enhancement performance. The results showed a factor of 25 ~ 30 in sensitivity enhancement in the experimental system, agreeing well with the theoretical expectations. Experiments on acetylene detection have also been carried out and the results showed that the ring cavity significantly increases the signal absorption and that high sensitivity can be obtained for gas detection.
An Algorithm for Bit Error Rate Monitoring and Adaptive Decision Threshold Optimization Based on Pseudo-error Counting Scheme
Kim, Sung-Man ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 22~27
DOI : 10.3807/JOSK.2010.14.1.022
Bit error rate (BER) monitoring is the ultimate goal of performance monitoring in all digital transmission systems as well as optical fiber transmission systems. To achieve this goal, optimization of the decision threshold must also be considered because BER is dependent on the level of decision threshold. In this paper, we analyze a pseudo-error counting scheme and propose an algorithm to achieve both BER monitoring and adaptive decision threshold optimization in optical fiber transmission systems. To verify the effectiveness of the proposed algorithm, we conduct computer simulations in both Gaussian and non-Gaussian distribution cases. According to the simulation results, BER and the optimum decision threshold can be estimated with the errors of < 20% and < 10 mV, respectively, within 0.1-s processing time in > 40-Gb/s transmission systems.
Spectrally Phase Coded Waveform Discrimination at 10 GHz for Narrow Band Optical CDMA within 100 GHz Spectral Window
Seo, Dong-Sun ; Supradeepa, V.R. ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 28~32
DOI : 10.3807/JOSK.2010.14.1.028
We demonstrate binary spectral phase coded waveform discrimination at 10 GHz for narrow band optical code-division multiple-access (NB-OCDMA) via direct electrical detection without using any optical hard-limiter. Only 9 phase-locked, 10 GHz spaced, spectral lines within a 100 GHz spectral window are used for the phase coding. Considerably high contrast ratio of 5 between signal and multiuser access interference noise can be achieved for
timing coordinated OCDMA at a simple electrical receiver with 50 GHz bandwidth.
New Iterative Filter for Fringe Adjustment of Joint Transform Correlator
Jeong, Man-Ho ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 33~37
DOI : 10.3807/JOSK.2010.14.1.033
The joint transform correlator (JTC) has been the best known technique for pattern recognition and identification. The JTC optically compares the reference image with the sample image then examines match or non-match by acquiring a correlation peak. However, the JTC technique has some problems such as weak correlation discrimination and noise which originates from the interference fringes in the Fourier transform plane. In order to solve these problems, this paper proposes a new technique of modifications of the interference fringes by adopting special iterative filters. Experimental results are presented to show that the proposed technique can successfully improve the correlation peaks and the level of discrimination.
Widely Tunable Coupled-ring Reflector Laser Diode Consisting of Square Ring Resonators
Kim, Su-Hyun ; Byun, Young-Tae ; Kim, Doo-Gun ; Dagli, Nadir ; Chung, Young-Chul ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 38~41
DOI : 10.3807/JOSK.2010.14.1.038
We design and fabricate a widely tunable laser diode made of InGaAsP-InP. The diode is monolithically integrated with a wavelength-selective coupled-ring reflector and semiconductor amplifiers. For realization of a compact size device, deeply etched multi-mode interference couplers and square ring resonators composed of total-internal-reflection mirrors are adopted and fabricated using a self-aligned process. It is demonstrated that the laser diode exhibits single mode operation and 16 nm tuning range with side-mode-suppression-ratio exceeding 20 dB.
Particle Image Velocimetry of the Blood Flow in a Micro-channel Using the Confocal Laser Scanning Microscope
Kim, Wi-Han ; Kim, Chan-Il ; Lee, Sang-Won ; Lim, Soo-Hee ; Park, Cheol-Woo ; Lee, Ho ; Park, Min-Kyu ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 42~48
DOI : 10.3807/JOSK.2010.14.1.042
We used video-rate Confocal Laser Scanning Microscopy (CLSM) to observe the motion of blood cells in a micro-channel. Video-rate CLSM allowed us to acquire images at the rate of 30 frames per second. The acquired images were used to perform Particle Image Velocimetry (PIV), thus providing the velocity profile of the blood in a micro-channel. While previous confocal microscopy-assisted PIV required exogenous micro/nano particles as the tracing particles, we employed blood cells as tracing particles for the CLSM in the reflection mode, which uses light back-scattered from the sample. The blood flow at various depths of the micro-channel was observed by adjusting the image plane of the microscope. The velocity profile at different depths of the channel was measured. The confocal micro-PIV technique used in the study was able to measure blood velocity up to a few hundreds
, equivalent to the blood velocity in the capillaries of a live animal. It is expected that the technique presented can be applied for in vivo blood flow measurement in the capillaries of live animals.
Optical Coherence Tomography Based on a Continuous-wave Supercontinuum Seeded by Erbium-doped Fiber's Amplified Spontaneous Emission
Lee, Ju-Han ; Jung, Eun-Joo ; Kim, Chang-Seok ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 49~54
DOI : 10.3807/JOSK.2010.14.1.049
In this study, the use of a continuous-wave (CW) supercontinuum (SC) seeded by an erbium-doped fiber's amplified spontaneous emission (ASE) for optical-coherence tomography imaging is experimentally demonstrated. It was shown, by taking an in-depth image of a human tooth sample, that due to the smooth, flat spectrum and long-term stability of the proposed CW SC, it can be readily applied to the spectral-domain optical-coherence tomography system. The relative-intensity noise level and spectral bandwidth of the CW SC are also experimentally analyzed as a function of the ASE beam power.
Lens Design of the Eyepiece Combined with the Accommodation-dependent Navarro Eye at an On-axis Point
Choi, Ka-Ul ; Song, Seok-Ho ; Kim, Sang-Gee ;
Journal of the Optical Society of Korea, volume 14, issue 1, 2010, Pages 55~62
DOI : 10.3807/JOSK.2010.14.1.055
We introduce a new method for lens design that combines an eyepiece with the finite model eye, to make a corrected version of the accommodation-dependent Navarro eye. The optical system that we designed, which includes a human eye, takes into account the aberration of the eye and increases the performance of the image in the retina. In the design results, for the optimized eyepiece combined with the corrected Navarro eye, visual acuity is 1.40. Compared with the existing method of eyepiece design using inverse ray tracing with the corrected Navarro eye, MTF value was recorded as 0.079 to 0.283 at 160 lp/mm and visual performance was improved.