Variable Optical Attenuator (VOA) is used for reduction and control optical signal in optical communication. Fiber optic manufacturer in China is one of the professional supplier for it.
 
There are mechanical, magnetic, LCD, MEMS, heat VOAs. Each of them has the ability to achieve preset target, only uses different media. Main principle is adapting media unique properties to  control attenuation accuracy. Due to this, it becomes key element as fiber optic cable supplier in optical network. Furthermore, VOA has characteristics of combining other optical parts to pursue high grade module.
 
Along with fast growing demand, newly produced fiber optic connectors, PON WDMs will come into market very soon.