• Title/Summary/Keyword: 소광

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Compensation Characteristics Depending on Extinction Ratio of RZ Pulse in Dispersion-managed Link Combined with MSSI (MSSI와 결합된 분산 제어 링크에서 RZ 펄스의 소광비에 따른 보상 특성)

  • Seong-Real Lee
    • Journal of Advanced Navigation Technology
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    • v.28 no.1
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    • pp.123-128
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    • 2024

  • When mid-span spectral inversion (MSSI), which inverts the propagated wave into phase-conjugated wave in the middle of the entire transmission distance, is combined with dispersion-managed link, it is very effective in compensating for the wavelength division multiplexed (WDM) signal distortion due to chromatic dispersion and nonlinear effects. In this MSSI combined dispersion-managed link, the shape of the dispersion map, channel data rate, channel wavelength and wavelength spacing, etc. affect the compensation and, consequently, determine the transmission distance and capacity of the WDM signal. In this paper, the compensation according to the extinction ratio of the return-to-zero (RZ) pulse that constitutes the WDM signal in the MSSI combined distributed control link was numerically analyzed. As a result of the simulation, it was conformed that the extinction ratio to obtain the best compensation should be determined depending on the shape of the dispersion map and the size of the residual dispersion per span, which determines the specific shape of the dispersion map. These results show a significant difference from the results in a general optical transmission system, where as the extinction ratio increases, the power difference between the '1' and '0' signals increases, thereby improving reception performance.

  • https://doi.org/10.12673/jant.2024.28.1.123 인용 PDF HTML

Theoretical Study on the Effects of Particle Size Distribution on the Optical Properties of Colloidal Gold (입자 크기 분포가 금 콜로이드의 광학성질에 미치는 영향에 대한 이론 연구)

  • Kim, Hyo-Jeong;Saha Leton Chandra;Jang, Joon-Kyung
    • Journal of the Korean Chemical Society
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    • v.51 no.5
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    • pp.407-411
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    • 2007

  • Mie theory has been used to calculate the extinction of a gold nanoparticle in water by varying its diameter from 1 to 1000 nm. Utilizing this size-dependent theoretical spectrum, we have calculated the extinction spectrum of a colloidal gold by taking into account the size distribution of particle. Such calculation is in better agreement with experiment than the calculation without considering the size distribution. A least-squares fitting is used to deduce the size distribution from an experimental extinction spectrum. For particles with their diameters ranging from 10 to 28 nanometers, the fitting gives reasonable agreement with the size distribution obtained from tunneling electron microscope images.

  • https://doi.org/10.5012/jkcs.2007.51.5.407 인용 PDF KSCI KPUBS HTML

Physical and Mechanical Properties of Korean Red Pine Wood from Different Growth Sites and Correlations between Them (생장지역별 소나무재의 물리적·역학적 특성과 상호 상관관계)

  • Han, Yeonjung;Lee, Hyun-Mi;Eom, Chang-Deuk
    • Journal of the Korean Wood Science and Technology
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    • v.44 no.5
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    • pp.695-704
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    • 2016

  • Physical and mechanical properties of Korean red pine wood grown in Anmyeon-do, Taean-gun, Chungcheongnam-do and Sogwang-ri, Uljin-gun, Gyeongsangbuk-do, Korea were measured and each relationships between them were analyzed. The ring width and latewood proportion along radial axis in Korean red pine at two-regions were measured by collecting the growth core of stands with age class V and IX. The ring width in Korean red pine at two-regions decreased with increasing cambium age. The average ring widths in age class V and IX in Anmyeon-do and Sogwang-ri were 2.865 mm, 1.705 mm, 4.764 mm, and 2.228 mm, respectively. The ring widths in Anmyeon-do were measured from 23% to 40% smaller than Sogwang-ri. The latewood proportion was negatively related with the ring width of Korean red pine at two-regions. The relationship between physical and mechanical properties of specimens for compressive and bending strength tests were analyzed with simple regression analysis. The relationship between latewood proportion and oven-dry density were positive and statistically significant. The relationship between latewood proportion and mechanical properties was slightly positive and not statistically significant, except the specimens for bending strength test of Anmyeon-do. The relationship between oven-dry density and mechanical properties was positive. It was just statistically significant in the specimens of Sogwang-ri. The compressive and bending strengths of Anmyeon-do and Sogwang-ri were 51.3 MPa, 80.5 MPa, 37.7 MPa, and 63.7 MPa, respectively. The strength difference between two-regions was determined to due to difference of ring width and latewood proportion by age class.

  • https://doi.org/10.5658/WOOD.2016.44.5.695 인용 PDF KSCI