Samsung Electronics Co., Ltd.

Sungkyunkwan University

Samda Co., Ltd.

Byeong-Hoon Kim

Seung-Ho Lee

Sun Haeng Cho

Sung-Han Lee

Han-Seo Ko

Byung-Hwan Kong

Seung-Hwan Kang

Young-Don Lee

A heating apparatus including a side wall heat insulator configured to provide an inner space for receiving a reaction tube, an upper wall heat insulator covering a top portion of the side wall heat insulator, a heat generation part in an inner surface of the side wall heat insulator, and a heat compensating part on a lower surface of the upper wall heat insulator, the heat compensating part including a reflection surface in a first region on the lower surface of the upper wall heat insulator, the first region having a first emissivity less than an emissivity of the upper wall heat insulator may be provided.

Heating apparatus and substrate processing apparatus having the same

The invention adds a function of Wavelength-Division-Multiplexing (WDM) to conventional transmission units to enlarge the transmission capacity. The DC WDM device of the invention includes a first WDM coupler module for inputting a first WDM optical signal subjected to transmission and a first optical signal of a fixed wavelength to wavelength-division-multiplex the signals, and a second WDM coupler module for demultiplexing a transmitted WDM optical signal to divide the same into a second optical signal of the fixed wavelength and a second WDM optical signal of the remaining wavelengths. The WDM system of the invention includes a pair of DC WDM sub-systems connected to each other via optical transmission/receiving channels for transmitting/receiving WDM optical signals, where one of the DC WDM sub-systems includes a plurality of transmission units for transmission/receiving optical signals of fixed wavelengths into and from corresponding transmission units of the other DC WDM sub-system, a plurality of DC WDM devices connected to one another into the shape of a daisy chain while coupled to said transmission units in one-to-one relation, and a fiber amplifier connected between said optical transmission/receiving channels and one of said DC WDM devices subjected to connection to said channels.

DC WDM device and DC WDM system and transmission network using the same

A device for providing a reference wavelength which is used in monitoring the performance of a WDM optical transmission system which includes a light emitting diode (LED) generating light in a predetermined wavelength band, a filter receiving the light from the LED and filtering an optical signal at a predetermined reference wavelength, a tap coupler extracting a portion of the optical transmission data, a coupler coupling the output of the tap coupler with the output of the filter, a sawtooth wave generator generating sawtooth waves in a voltage range which includes the reference wavelength and the different wavelengths of the optical transmission light, and a variable optical filter receiving the output of the coupler and the sawtooth waves and filtering the output of the coupler where the sawtooth waves overlap.

Reference wavelength providing device for performance monitor in WDM optical transmission system

Growing community of inventors

Hwaseong-si, South Korea

Byeong-Hoon Kim