Electronics and Telecommunications Research Institute

Korea Research Institute of Standards and Science

Seung Kwan Kim

Dong-Hoon Lee

Sang Soo Lee

Moo Jung Chu

Jin Soo Han

Seongchong Park

Seung Nam Park

Dong Ho Lee

Dong-Joo Shin

Jae Geun Kim

Ji Soo Hwang

Chul Woung Park

Yong Shim Yoo

The present invention relates to an apparatus and a method for inspecting quantum efficiency homogeneity of a solar cell using a spatial light modulating device. The apparatus includes a light emitting device configured to radiate predetermined light; a spatial light modulating device configured to change a light path of rays emitted from the light emitting device according to individual control of a plurality of pixels; a spatial light modulating device controller configured to individually control the states of the plurality of pixels; a solar cell which the rays passing through or reflected from the spatial light modulating device irradiate; and a calculation controller configured to calculate quantum efficiency of the solar cell based on a photocurrent signal generated from the solar cell.

Apparatus and method for inspecting homogeneity of solar cell quantum efficiency using imaging device

A channel allocation method of channels having different transmission speeds in a wavelength division multiplexing (WDM) system is provided. The channel allocation method in a multirate optical transmission system includes selecting a channel having the lowest transmission speed from not allotted channels, allotting the selected channel to the longest wavelength band of empty wavelength bands, and determining whether not allotted channels exist in order to repeatedly perform selecting the channel having the lowest transmission speed from the not allotted channels and allotting the selected channel to the longest wavelength band of the empty wavelength bands, until all the channels are allotted.

Channel allocation method in multirate WDM system

A multichannel fiber laser whose wavelength range is expansible to increase the number of lasing channel, and whose channel output powers are equalized, in order to provide a useful multichannel laser source having a wide bandwidth is described. The laser comprises a gain offering means; a gain equalizing means; and a resonating means. In addition, a method for designing the spectral profile of a gain equalizing filter for the purpose of this invention is described.

Wideband multichannel fiber lasers with output power equalization

Growing community of inventors

Daejeon, South Korea

Seung Kwan Kim