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Your search keyword '"Lee, Hyung-Jong"' showing total 182 results
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182 results on '"Lee, Hyung-Jong"'

13. Circular-harmonic vector analysis of a dielectric waveguide with a cross-cut-circle cross section

Author

Yang, Soon-Chul, Kim, Han-Soo, and Lee, Hyung Jong

Subjects
Waveguides -- Evaluation, Astronomy, Physics
Abstract

Vector-wave solutions of dielectric waveguides with cross-cut-circle cross sections, which are commonly produced by reflow of the waveguide core on a planar substrate at high temperature, are rigorously analyzed by the use of the point-matching method. As a numerical example, the propagation constant, electromagnetic-field distribution, and convergence of mode solutions for a semicircular waveguide are presented, and the properties of these modes are discussed. Key words: Dielectric waveguide, vector solution, cross-cut circle, semicircular cross section.

Published
1995

15. Self-mode-locked unstable resonator copper vapor laser

Author

Baik, Se Jong, Im, Kiegon, Lee, Hyung Jong, and Ryu, Young Tae

Subjects
Lasers -- Research, Quantum electronics -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A copper vapor laser with unstable resonator optics and intracavity beam splitter has been studied.

Published
2000

49. A $1\times 8$ Splitter Chip With Integrated Fiber Grooves for Reliable Passive Alignment of Fiber Arrays.

Author

Oh, Jin Kyoung, Cho, Jeong Hoon, Ryu, Sang-Wan, and Lee, Hyung Jong

Abstract

A $1\times 8$ optical splitter with integrated fiber-positioning grooves was fabricated by simultaneous formation of the waveguide cores and grooves. The waveguide cores were realized by intaglio etching of a fused-silica wafer and subsequent core filling, followed by the deposition of an overcladding layer. Fiber-positioning grooves were then formed by wet etching the silica wafer with the use of a highly selective SiNx mask. Passive alignment was accomplished by guiding the fibers into the grooves, which is favorable for automated mass production of splitter modules. The resulting $1\,\times \,8$ splitter module exhibited a small insertion loss of <10 dB, low polarization-dependent loss of <0.12 dB, and high return loss of >59 dB. It yielded good reliability during a damp heat test at 85 °C and 85% humidity, and the insertion loss varied by <0.3 dB. This simple and reliable approach to fabricating optical splitter modules is expected to greatly reduce the time and costs associated with packaging and enable automation of the process. [ABSTRACT FROM PUBLISHER]

Published
2015
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