Samsung Electronics Co., Ltd.

Yunhee Cho

Yun-Je Oh

Seong-Taek Hwang

Hyeonjin Shin

Hyoyoung Lee

Chang-Hee Lee

Hyun Deok Kim

Jeong-Hun Shin

Meeree Kim

Example embodiments relate to a method of preparing a two-dimensional (2D) transition metal chalcogenide nanostructure, the method including preparing a 2D transition metal chalcogenide nanostructure by a reaction between a transition metal precursor and a chalcogen precursor in a composition including a solvent, wherein the chalcogen precursor is a compound including a first bond connecting two neighboring chalcogen elements and the second bond connecting one of the two neighboring chalcogen elements and a hetero-element adjacent thereto, and binding energy of the second bond is 110% or less of the binding energy of the first bond, a 2D transition metal chalcogenide nanostructure prepared thereby, and a device including the 2D transition metal chalcogenide nanostructure.

Two-dimensional transition metal chalcogenide nanostructure, device including the same, and method of preparing the two-dimensional transition metal chalcogenide nanostructure

Disclosed is a bi-directional optical-amplifier module including first through fourth optical amplifiers, a mid-stage device for performing a desired signal processing for an upward or downward optical signal passing therethrough, a first optical-signal-path-setting device for supplying an optical signal inputted to a first input/output terminal of the bi-directional optical-amplifier module while outputting an optical signal outputted from the fourth optical amplifier to the first input/output terminal, a second optical-signal-path-setting device for supplying an optical signal inputted to a second input/output terminal of the bi-directional optical-amplifier module while outputting an optical signal outputted from the third optical amplifier to the second input/output terminal, a third optical-signal-path-setting device for outputting an optical signal outputted from the first optical amplifier to a first input/output terminal of the mid-stage device while supplying an optical signal outputted from the first input/output terminal of the mid-stage device to the fourth optical amplifier, and a fourth optical-signal-path-setting device for outputting an optical signal outputted from the second optical amplifier to a second input/output terminal of the mid-stage device while supplying an optical signal outputted from the second input/output terminal of the mid-stage device to the third optical amplifier.

Bi-directional optical-amplifier module

Growing community of inventors

Suwon-si, South Korea

Yunhee Cho