[1] ETRI, Convergence Components & Mat Res Lab, Taejon 305700, South Korea
[2] Korea Adv Inst Sci & Technol, Photon Comp Syst Lab, Taejon 305701, South Korea
[3] Lightron Fiber Opt Devices Inc, Taejon 306220, South Korea
[4] ChemOptics Inc, Taejon 305510, South Korea