Abstract

Since about 1980, 1 fused fiber products fabricated by tapering two single-mode fibers appropriately twisted or juxtaposed and heated have provided a practical solution to the need for a stable and low loss all-fiber products such as couplers/splitters, WDMs, 2 fixed attenuators, and other special fused products. As we know, optical power coupling between fibers results from the effective fiber cores (or mode field diameter) expanded by tapering. Since fused biconical taper (FBT) process makes fiber becoming “thin” in tapering region, this could result in fiber broken inside product package, hence affects the reliability of products. To solve this problem, a few companies developed some solutions such as overclad technology.3 We also took long time to address this issue, and finally invented a new process-thermal diffusion technology (TDT), this process can be not only easily used to build products with ultrahigh reliability but also easily transferred from the current FBT process. What makes it more wonderful is that we can use traditional FBT machine to implement this process to make a serial of fused fiber products without tapering region.

© 2002 Optical Society of America

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References

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