Korea Institute of Science and Technology

Myong Wook Kim

Young Min Jhon

Sang Kuk Kim

Bong Kyu Kim

Jae Cheol Jo

Seong Yun Ko

A polarization-dependent type directional isolator. The polarization-dependent type directional isolator comprises a pair of first optical means positioned at a path along which light travels for changing the rotation direction of an incident light depending on the traveling direction of the incident light; a pair of second optical means for rotating the incident light by a given angle; and a third optical means positioned between the pair of second optical means for passing through only specific components of the components of the incident light, thereby making it possible to obtain laser outputs oscillating in both directions independently.

Polarization-dependent type directional isolator and ring-type resonator laser

A method and apparatus for controlling gain of an optical fiber amplifier includes a plurality of optical isolators, an excitation light source, a wavelength division optical fiber coupler, and a special optical fiber. At least one of the optical isolators is disposed at both input and output ports of the optical fiber amplifier so that an input signal light can propagate in one direction. The wavelength division optical fiber coupler couples excitation light from the excitation light source to the input signal light or separates one of the excitation light and the input signal light from the other.

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Seoul, South Korea

Myong Wook Kim