• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.2
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• pp.89-94
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• 2017

This paper presents a theoretical study of transmission performance for optical duobinary transmitters employed a Mach-Zehnder modulator. Especially, we have investigated the performance of the various transmitters for transmitting 25Gbps optical duobinary signals at a wavelength of 1550nm without any dispersion compensation methods over single mode fiber. Due to the characteristics of generating their duobinary signals, each transmitter has a distinct optical power spectrum and an eye opening shape. By these, there was a difference in the dispersion tolerance. We could find a suitable transmitter for 25Gbps transmission considering the structure complexities and the restricted conditions with the simulation results.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11a
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• pp.273-274
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• 2005

• The Magazine of the IEIE
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• v.30 no.5
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• pp.36-36
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• 2003

• The Magazine of the IEIE
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• v.30 no.5
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• pp.492-498
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• 2003

• 한국지구과학회:학술대회논문집
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• 2002.02a
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• pp.24-24
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• 2002

• 전기의세계
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• v.58 no.7
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• pp.35-44
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• 2009

• Proceedings of the KSMRM Conference
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• 1997.10a
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• pp.42-42
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• 1997

• Proceedings of the Korean Vacuum Society Conference
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• 1992.02a
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• pp.11-11
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• 1992

• The Science & Technology
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• v.27 no.11 s.306
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• pp.31-34
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• 1994

• Journal of the Korean Society for Nondestructive Testing
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• v.34 no.2
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• pp.148-154
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• 2014

Photoelasticity is a useful technique for obtaining the differences and directions of principal stresses in a model. In conventional photoelasticity, the photoelastic parameters are measured manually point by point. Identifying and measuring photoelastic data is time-consuming and requires skill. The fringe phase shifting method was recently developed and has been found to be convenient for measuring and analyzing fringe data in photo-mechanics. This paper presents an experimental study on the stress distribution along a horizontal line that passes the central point of a rhombus plate made of Photoflex (i.e., type of urethane rubber). The isoclinic fringe and/or principal stress direction is constant on this horizontal line, so a four-bucket phase shifting method can be applied. The method requires four photoelastic fringes that are obtained from a circular polariscope by rotating the analyzer at $0^{\circ}C$, $45^{\circ}C$, $90^{\circ}C$ and $135^{\circ}C$. Experimental measurements using the method were quantitatively compared with the results from FEM analysis; the results from the two methods showed comparable agreement.