FBT Coupler Splitters is widely accepted and used in passive optical networks, especially for instances where the split configuration is smaller (1×2, 1×4, etc.). FBT is the traditional technology in which two fibers are placed closely together, typically twisted around each other and fused together by applying heat while the assembly is being elongated and tapered. Fiberinthebox supply high quality FBT splitters, single mode couplers with single/double/three windows with competitive price to make your optical network system cost effective.