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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 23, Issue 6 - Dec 2012
Volume 23, Issue 5 - Oct 2012
Volume 23, Issue 4 - Aug 2012
Volume 23, Issue 3 - Jun 2012
Volume 23, Issue 2 - Apr 2012
Volume 23, Issue 1 - Feb 2012
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A Study for Non-paraxial Diffraction Caused by Curved Principal Planes
Lee, Jong Ung ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 1~5
DOI : 10.3807/KJOP.2012.23.1.001
According to the paraxial diffraction theory, diffractions of optical systems which have the same wavelength and numerical aperture are always the same, independent of lateral magnification. But the diffractions for optical systems with different magnifications are varied due to the non-paraxial diffraction effect on the imaging of high NA optics. In this study, the non-paraxial diffraction effect is interpreted as a phenomena caused by curved principal planes. Pupil functions and modulation transfer functions of aplanatic conic mirrors are examined as a function of lateral magnification.
The Burst Effect Analysis of 2.5 Gb/s TDM-PON Systems Using a SOA Link Extender
Choi, Bo-Hun ; Lee, Sang Soo ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 6~11
DOI : 10.3807/KJOP.2012.23.1.006
A bidirectional TDM-PON link to support 2.5 Gb/s upstream signals of 256 ONUs was considered for an extended transmission distance of 50 km. The power budget of the link was 58 dB for the upstream signal and a SOA was applied as a link extender which had a 25 dB gain. Receiver sensitivity of the upstream signal was -25 dBm for -30 dBm input power to the SOA. When the input power was -10 dBm, pulse overshooting caused by gain transient of the SOA was maximum at 45% and the signal performance degradation gave a power penalty of 1.55 dB for
BER. However the penalties diminished rapidly and became negligible as the input power went below -15 dBm. So this input power dynamic range of up to -15 dBm means that it is not positively necessary to use gain control methods for the next generation TDM-PON systems.
Flexible Optical Waveguide Film with Embedded Mirrors for Short-distance Optical Interconnection
An, Jong Bae ; Lee, Woo-Jin ; Hwang, Sung Hwan ; Kim, Gye Won ; Kim, Myoung Jin ; Jung, Eun Joo ; Rho, Byung Sup ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 12~16
DOI : 10.3807/KJOP.2012.23.1.012
In the paper, we fabricated a Ni master with
-mirror structures for flexible waveguide fabrication. The flexible waveguide films with embedded
-angled mirrors at the waveguide ends were successfully fabricated using a UV-imprint process. Next, in order to enhance the reflectivity of the mirrors, Ni(3 nm)-Au(200 nm) bilayers were evaporated on the
-angled facets through a locally opened thin mask using an electron beam evaporator. We measured propagation loss, bending loss, mirror loss and bending reliability of the fabricated waveguide.
A Study for an Analytic Conversion between Equivalent Lenses
Lee, Jong Ung ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 17~22
DOI : 10.3807/KJOP.2012.23.1.017
An equivalent lens is a lens which has the same total power of refraction and the same paraxial imaging characteristics for the marginal rays as another lens, but has a different axial thickness. In this study, an analytic lens conversion from a thick lens to its equivalent lens is investigated, then it is shown that the equivalent lens is a solution of a quadratic equation. Every thick lens corresponds to one of two real roots of this quadratic equation. Therefore, except in the case of a unique solution, the equation has a conjugate solution, the other of the two roots. The conjugate solution has the same axial thickness, power, and paraxial imaging characteristics, but it has different shape and aberration characteristics. The characteristics of an equivalent lens and its conjugate solution are examined by using a sample lens.
Implementation of Multi-channel Concurrent Detection Homodyne Frequency-domain Diffuse Optical Imaging System
Jun, Young Sik ; Baek, Woon Sik ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 23~31
DOI : 10.3807/KJOP.2012.23.1.023
In this paper, we developed a frequency-domain diffuse optical imaging (DOI) system for imaging non-invasively using near-infrared (NIR) light sources and detectors. 70-MHz modulation and a homodyne scheme were adopted. By calibration of the coupling coefficients, concurrent detection measurements by 4 detector sets were optimized. We presented experimental reconstruction images of absorption and scattering coefficients in a liquid phantom, located an anomaly in the phantom and determined its optical properties. The images by the multi-channel concurrent detection were improved over the results by single-channel sequential detection. Tomographic slices of absorption and scattering coefficients in the phantom with an anomaly were also presented.
Analysis of the Optimized 3D Depth of Integral Imaging
Choi, Hee-Jin ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 32~35
DOI : 10.3807/KJOP.2012.23.1.032
In this paper, an analysis of the optimized 3D depth of integral imaging is proposed. We achieve this by calculating the amount of image distortion and considering the threshold of recognition in the human visual system. Experimental results are also provided to test the theory.
Characteristics of Nanoscale Modes Guided by the Total External Reflection of Surface Plasmon-Polaritons
Seol, Kang Hee ; Song, Seok Ho ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 36~41
DOI : 10.3807/KJOP.2012.23.1.036
Total external reflection (TER), which does not occur on a dielectric interface, is a unique feature of surface plasmon-polaritons (SPP). We propose an SPP-TER waveguide structure consisting of low-index dielectric nanocore covered with high-index dielectric on a flat metal surface. The SPP mode confined in the nanocore by the TER effect has a mode size much smaller than wavelength scale. Numerical comparison of mode characteristics between the SPP-TER waveguides and other total-internal-reflection-based waveguides such as metal or high-index dielectric nanowires show that the SPP-TER structures can possess higher modal gain for applications of nanocavity lasers.
Modeling of Active Layer and Injection-locking Characteristics in Polarized and Unpolarized Fabry-Perot Laser Diodes
Chung, Youngchul ; Yi, Jong Chang ; Cho, Ho Sung ;
Korean Journal of Optics and Photonics, volume 23, issue 1, 2012, Pages 42~51
DOI : 10.3807/KJOP.2012.23.1.042
In this paper, injection-locking characteristics versus active layer structures in Fabry-Perot laser diodes (FP-LD) are compared. TE and TM gain spectra and peak gains versus carrier density in polarized and unpolarized multiple quantum well structures and in an unpolarized bulk structure are calculated. The calculated gain parameters are applied to a time-domain large-signal model to simulate the injection-locking characteristics. The results show that RIN in unpolarized FD-LDs is about 3 dB lower than that in a polarized FP-LD and that the eye characteristics of the unpolarized FP-LD are much better than those of the polarized FP-LD.