Electronics and Telecommunications Research Institute

Konkuk University Industrial Cooperation Corp

Korea Telecommunication Authority

Byeong Hoon Kim

Byoung Gon Yu

Sung Min Yoon

Chi Sun Hwang

Ji Sun Kim

Sang Hee Park

Kee Chan Park

Him Chan Oh

Jae Eun Pi

Tao Ren

Min Woo Oh

Hong Kyun Leem

Ki Hwan Kim

Yong Hyub Won

Kwang Uk Chu

Hong Kyung Leem

Seo Y Shin

Disclosed are an inverter, a NAND gate, and a NOR gate. The inverter includes: a pull-up unit constituted by a second thin film transistor outputting a first power voltage to an output terminal according to a voltage applied to a gate; a pull-down unit constituted by a fifth thin film transistor outputting a ground voltage to the output terminal according to an input signal applied to a gate; and a pull-up driver applying a second power voltage or the ground voltage to the gate of the second thin film transistor according to the input signal.

Inverter, NAND gate, and NOR gate

A simultaneous optical compression and decompression apparatus having a simple symmetrical arrangement including a plurality of optical splitting/combining units capable of achieving simultaneous splitting and combining of optical signals in opposite directions, a plurality of optical delay units each arranged between adjacent ones of the optical splitting/combining units and adapted to delay the time taken for an optical signal to pass therethrough in each of opposite directions by a predetermined time, so as to reproduce the optical signal in accordance with a predetermined rule. The apparatus also includes a pair of optical isolation units respectively connected to opposite end-side ones of the optical splitting/combining units, each of the optical isolation units being adapted to allow an optical signal to pass therethrough in one direction; a pair of optical switching units respectively connected to opposite end-side ones of the optical splitting/combining units and adapted to switch optical signals output from the optical splitting/combining units in response to control signals, so as to allow predetermined optical signals to pass therethrough; and a pair of control units respectively connected to the optical switching units and adapted to apply the control signals to the optical switching units.

Simultaneous optical compression and decompression apparatus

Growing community of inventors

Gyeonggi-do, South Korea

Byeong Hoon Kim