Fusion splicing is a well-known technique to connect a fiber pair and fusion splicers have been commercially available for this process for a long time. An important feature of a fusion splice is the coupling loss that is influenced by – among 3 things – the mutual spotsizes of the two fibers involved. Hence, similiar fibers such as standard single mode fibers can be spliced to nearly zero loss whereas dissimiliar fiber pairs may give higher loss. The latter category covers the splice combinations of erbium doped fibers that are often spliced to 3 fiber types such as the standard single mode fiber.|Fusion splicing is a well-known technique to connect a fiber pair and fusion splicers have been commercially available for this process for a long time. An important feature of a fusion splice is the coupling loss that is influenced by – among 3 things – the mutual spotsizes of the two fibers involved. Hence, similiar fibers such as standard single mode fibers can be spliced to nearly zero loss whereas dissimiliar fiber pairs may give higher loss. The latter category covers the splice combinations of erbium doped fibers that are often spliced to 3 fiber types such as the standard single mode fiber.

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