GLsun Science And Tech Co., Ltd, Established in 2001, as a national high-newly technology corporation, with several national patents of optical switch and test instruments, is a specialized corporation that engaged in developing, manufacturing ,selling fiber test instruments , optical passive devices and Optical protection equipment for fiber communication applications. It also provides technical services for fiber-network project. After more than 8 years efforts, the company now has the registered capital of 20 million RMB. New workshop buildings, which has built in the Guilins National High-Tech IT Zone in 2006, with the size of 5600O. With the superexcellent location and climate, the favorable researching and developing base, and the strong human resource, GLsun has gotten quick and strong development. Up to now, Glsun has offices in Shenzhen and Wuhan, branches in Nanjing, Shenyang,