A compound glass optical fiber consist of a core with high refractive index and a cladding with lower refractive index, drawn by double-crucible process or rod-in-tube process. According to different applications, with rational design and delicate manufacture, using advanced technology, we can provide various of glass optical fiber products, with transmissivity more than 56% per meter. Glass optical fiber itself is an inorganic material, which is resistant to temperature higher than 500℃. Glass Fiber Light Guide is composed by glass fiber optic core and PVC/stainless jacket. It can be used for gap lighting, code scanning and so on.