Low-loss spot-size transformer by dual tapered waveguides (DTW-SST)

N. Yamaguchi, Y. Kokubun, K. Sato

doi:10.1109/50.50765

Low-loss spot-size transformer by dual tapered waveguides (DTW-SST)

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説明

The reduction of the insertion loss of a spot-size transformer based on dual tapered waveguides (DTW-SST) by controlling the shape of the tapered portion is discussed. The transformer is easily fabricated using a shadow mask sputtering method. A method is described for controlling independently the parameters of the tapered portion, such as the maximum taper angle, and length, and the position of tapered portion with respect to the edge of the shadow mask. A large transformation ratio (5 and 1/5) and a low insertion loss (0.7 dB) have been obtained. >