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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
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Volume & Issues
Volume 22, Issue 6 - Dec 2011
Volume 22, Issue 5 - Oct 2011
Volume 22, Issue 4 - Aug 2011
Volume 22, Issue 3 - Jun 2011
Volume 22, Issue 2 - Apr 2011
Volume 22, Issue 1 - Feb 2011
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Saturable Absorber Reflectors Based on Guided-mode Resonance in Slot Waveguides
Kim, Myung-Hwan ; Kim, Sang-In ;
Korean Journal of Optics and Photonics, volume 22, issue 3, 2011, Pages 117~121
DOI : 10.3807/KJOP.2011.22.3.117
We propose a saturable absorber reflector based on guided-mode resonance. A carbon nanotube is used as a saturable absorber. By tuning the fill factor, modulation depth can be increased without a change of height of the CNT. We investigate the reflector properties such as modulation depth, bandwidth and peak reflectance as a function of the height of the CNT and the fill factor. The advantage of the proposed reflector is that it can reduce saturation energy by 50 times compared with CNT thin film of 100~200nm.
The Optical Filtering Effect of a RSOA-based Broadband Light Source in a Bidirectional WDM-PON System
Choi, Bo-Hun ;
Korean Journal of Optics and Photonics, volume 22, issue 3, 2011, Pages 122~128
DOI : 10.3807/KJOP.2011.22.3.122
The AWG-filtering effect was investigated on a bidirectional 100-GHz-channel-spacing WDM-PON link using spectrum-sliced and RSOA-amplified light sources for downstream signals and a wavelength reuse technique for upstream signals. Signal performances of three different filtering AWGs, including Gaussian, trapezoidal, and rectangular types, were compared on link transmission with fiber nonlinear effects. As an extinction ratio of a downstream signal varied, the effect for both directional signals was analyzed and optimized. It was found that there was an optimal pass bandwidth of an AWG for the balance between relative intensity noise decrement and cross phase modulation noise increment as the bandwidth got wider.
Study on Error Reduction in Dual Wavelength Digital Holography Using Modified Fine Map
Yu, Young-Hun ;
Korean Journal of Optics and Photonics, volume 22, issue 3, 2011, Pages 129~133
DOI : 10.3807/KJOP.2011.22.3.129
Dual-wavelength holography has better axial range than single-wavelength holography, allowing unambiguous phase imaging but at the expense of increased noise. We have studied error reduction in dual wavelength holography using a modified fine map. The fine map is successful in measurement and has shown error reduction when the height of the object is less than the appled wavelength, but is unstable when the step height is larger than that wavelength. We have modified the fine map and we have found that the modified fine map was successful in measurement and error reduction even though the height of object was larger than the wavelength.
Frequency-domain Diffuse Optical Tomography System Adopting Lock-in Amplifier
Jun, Young-Sik ; Baek, Woon-Sik ;
Korean Journal of Optics and Photonics, volume 22, issue 3, 2011, Pages 134~140
DOI : 10.3807/KJOP.2011.22.3.134
In this paper, we developed a frequency-domain diffuse optical tomography(DOT) system for non-invasively imaging in vivo. The system uses near-infrared(NIR) light sources and detectors for which the photon propagation in human tissue is dominated by scattering rather than by absorption. We present the experimental reconstruction images of absorption and scattering coefficients using a liquid tissue phantom, and we obtain the location and shape of an anomaly which has different optical properties than the phantom.
Basic Design Guidelines for LED Lamp Packages
Youk, Ji-Hyun ; Hong, Dae-Woon ; Lee, Song-Jae ;
Korean Journal of Optics and Photonics, volume 22, issue 3, 2011, Pages 141~150
DOI : 10.3807/KJOP.2011.22.3.141
Although significant amount of research has been done to develop LED lamp packages for improved performance, no standard theories or guidelines have been established yet for designing LED lamp packages. In this paper, the photon extraction efficiency depending on both the InGaN/Sapphire LED chip structure and its attachment schemes for chip mounting has been analyzed by using the Monte Carlo photon simulation method. Based on the results of the analysis, we have derived guidelines for LED lamp package design, which can be utilized in industries or research institutes for designing new LED lamp packages optimized for particular applications.
Optical System Design and Experimental Demonstration of Long-range Reflective-type Precision Displacement Sensors
Lim, Jae-In ; Kim, Seung-Hwan ; Lee, Seoung-Hun ; Jeong, Hae-Won ; Lee, Min-Hee ; Kim, Shung-Whan ; Kim, Kyong-Hon ;
Korean Journal of Optics and Photonics, volume 22, issue 3, 2011, Pages 151~158
DOI : 10.3807/KJOP.2011.22.3.151
This paper reports design and demonstration of optical systems for reflective-type remote optical displacement sensors. Optical systems for light illumination sources and a position sensitive detector (PSD) for the displacement sensor were developed to sense displacement of bridges and instability of skyscrapers in a distance range from 10 m to 250 m to an accuracy better than a few mm. Performance of the optical systems was verified by composing a displacement sensor and by using it in measurement of displacement of a remote target with proper reflective optics depending on distance. The displacement sensor was composed of two LED light sources, each with collimating optics, and a two-dimensional PSD with telescope-type optics. Its displacement resolutions was measured to be 0.1 mm at a distance of 10 m and less than 3 mm at a distance of 250 m.