Fused fiber products without a fused biconical taper

We have introduced a novel method to make almost all of fused fiber product families, including 1/spl times/2/2/spl times/2 narrowband and broadband splitters/couplers, 1/spl times/3, 1/spl times/4 splitters with symmetrical and asymmetrical splitting ratio, fixed fused fiber attenuators, and wavelength division multiplexers by using thermal diffusion technology (TDT) instead of traditional FBT process. More important, these products have ultra-high reliability, and currently have huge applications in submarine systems, backbone terrestrial systems. It is certain that these products will be widely used in metropolitan networks and optical PONs in the future. And the fused fiber products machines no longer have pulling stages if using TDT process.