GLsun Science And Tech Co., Ltd, founded in 2001, as a national high-tech corporation, specializes in the research, development and manufacturing of optical switch, Free Space Isolator, DWDM componets and modules, passive fiber device of EDFA, optical protection equipments, optical intelligent test system. GLsun is a key high & new technology enterprise of national torch plan, rewarded surpport from the National Science and Technology Innovation Fund and the Major Industry Projects of National Development and Reform Commission. And its products obtain many national patents.