Pukyong National University

Yongwook Lee

JungHwan Oh

Jihoon Kim

Seungyun Nam

Youngmog Kim

Junhyeog Jeong

Hyunwook Kang

Wook Jang

A high-order optical fiber multi-wavelength filter includes a polarization beam splitter configured to form a polarization-diversity loop configuration by splitting light received from a broadband light source into two polarization components, combining circulated and input light of the two polarization components, and outputting the combined light, a pair of polarization controllers each including at least one wave plate in combination, and configured to change a polarization state of input light, and a pair of polarization-maintaining fibers configured to form interference spectrums by assigning phase differences through birefringence.

High-order optical fiber multi-wavelength filter, and continuous wavelength tuning method using the same

A method for switching a memory resistance, including: changing a memory resistance of an oxide thin film of a semiconductor device by irradiating a near-infrared laser beam onto the oxide thin film, the semiconductor device having the oxide thin film formed on a substrate and two terminals formed at both ends of the oxide thin film.

Method for switching memory resistance by near-infrared laser beam

An apparatus for discriminating bacteria types using optical scattering patterns is disclosed. The apparatus includes an optical fiber for transferring light emitted from a light source, a lens for controlling a width of the light received from the optical fiber, a linear polarizer for transmitting the light passing through the lens and a bacterial colony, and a capturing unit for capturing an optical scattering pattern of the light transmitted through the linear polarizer.

Apparatus for discriminating bacteria types using optical scattering patterns

An optical fiber multi-wavelength filter based on a polarization-diversity loop configuration within which polarization-maintaining fibers are contained with some optical elements is disclosed. The filter includes a coil heater adjacent to polarization-maintaining fibers. An ambient temperature of the polarization-maintaining fiber is controlled by adjusting a current applied to the coil heater.

Optical fiber multi-wavelength filter and method of controlling wavelength of spectrum using the same

An optical fiber hydrogen sensor and a method of measuring a hydrogen concentration are provided. The optical fiber hydrogen sensor may include a light source, a polarization beam splitter connected to the light source to split light from the light source into two polarization beams, a high-birefringence optical fiber connected to the polarization beam splitter and coated with a hydrogen reactant, and an optical spectrum analyzer connected to the polarization beam splitter to measure interference spectrum generated at the high-birefringence optical fiber.

Growing community of inventors

Busan, South Korea

Yongwook Lee