Korea Advanced Institute of Science and Technology

Kwangwoon University Industry-Academic Collaboration Foundation

Kwang Pyo Hong

Chang Hee Lee

Jae Hyun Lee

Soon Chul Kwon

Jin Serk Baik

Seung Hyun Lee

Lee Hwan Hwang

Sang Mook Lee

Sil Gu Mun

Sung Jae Ha

Sung Man Kim

Disclosed in the present invention is a floating hologram system. The floating hologram system includes a diffuser configured to form a projection image using light beams transmitted from an image transmitter and diffuse the formed image, and a holographic optical element on which the image diffused from the diffuser is incident and which generates a virtual image floating at a position a predetermined distance therefrom and has a convex lens characteristic. A distance between the diffuser and the holographic optical element is determined based on a focal length of the holographic optical element and a distance from the holographic optical element to the virtual image.

Floating hologram system using holographic optical element

An optical network terminator of the present invention includes an optical wavelength division multiplexer for receiving an optical signal and incoherent light. An optical detection unit converts a downstream high speed and low speed optical signals into electrical signals. A laser diode converts an upstream signal into an optical signal. A high speed driving unit is supplied with power from a power supply unit to drive a forward-biased laser diode and establish a data and video channel. A high speed reception unit is supplied with the power to receive a downstream data and video channel. A charging unit outputs charged power at the time of a power failure. A low speed driving unit is supplied with the charged power to reverse-bias the laser diode to establish a voice channel. A low speed reception unit is supplied with the charged power to receive a voice channel.

Optical network terminator and optical network connection method using it

Growing community of inventors

Seoul, South Korea

Kwang Pyo Hong