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Hiroshi NAKAMOTO Masaaki MATSUURA Fumihiko ITO Tadatoshi TANIFUJI
Buried heterostructure waveguides with high coupling efficiency for dual shaped core fiber with zero dispersion at 1.55 µm are described. Calculations reveal that the mode mismatch loss of 0.35 dB with mode confinement coefficient of 0.6 can been achieved for dual shaped core single-mode fibers. While, for conventional single-mode fibers, mode mismatch loss becomes large.