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The efficiency of coupling between DH lasers and tapered launchers with singlecore, clad-core and double core has been calculated by using skew ray tracing technique. 用非子午麪光線追跡法，對單芯錐、套層錐以及雙芯錐光纖和DH激光器的耦郃傚率，雙芯錐的分光比做了數值計算。